qrhi.cpp 137 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt RHI module
**
** $QT_BEGIN_LICENSE:LGPL3$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qrhi_p.h"
Laszlo Agocs's avatar
Laszlo Agocs committed
38
#include "qrhirsh_p.h"
39 40
#include <qmath.h>

Laszlo Agocs's avatar
Laszlo Agocs committed
41
#include "qrhinull_p.h"
42
#ifndef QT_NO_OPENGL
43
#include "qrhigles2_p.h"
44
#endif
45 46 47 48 49 50 51 52 53 54 55 56
#if QT_CONFIG(vulkan)
#include "qrhivulkan_p.h"
#endif
#ifdef Q_OS_WIN
#include "qrhid3d11_p.h"
#endif
#ifdef Q_OS_DARWIN
#include "qrhimetal_p.h"
#endif

QT_BEGIN_NAMESPACE

Laszlo Agocs's avatar
Laszlo Agocs committed
57 58 59
/*!
    \class QRhi
    \inmodule QtRhi
Laszlo Agocs's avatar
Laszlo Agocs committed
60 61

    \brief Accelerated 2D/3D graphics API abstraction.
Laszlo Agocs's avatar
Laszlo Agocs committed
62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153

     QRhi is an abstraction for hardware accelerated graphics APIs, such as,
     \l{https://www.khronos.org/opengl/}{OpenGL},
     \l{https://www.khronos.org/opengles/}{OpenGL ES},
     \l{https://docs.microsoft.com/en-us/windows/desktop/direct3d}{Direct3D},
     \l{https://developer.apple.com/metal/}{Metal}, and
     \l{https://www.khronos.org/vulkan/}{Vulkan}.

    Each QRhi instance is backed by a backend for a specific graphics API. The
    selection of the backend is a run time choice and is up to the application
    or library that creates the QRhi instance. Some backends are available on
    multiple platforms (OpenGL, Vulkan, Null), while APIs specific to a given
    platform are only available when running on the platform in question (Metal
    on macOS/iOS/tvOS, Direct3D on Windows).

    \section2 Design Fundamentals

    A QRhi cannot be instantiated directly. Instead, use the create()
    function. Delete the QRhi instance normally to release the graphics device.

    \section3 Resources

    Instances of classes deriving from QRhiResource, such as, QRhiBuffer,
    QRhiTexture, etc., encapsulate zero, one, or more native graphics
    resources. Instances of such classes are always created via the \c new
    functions of the QRhi, such as, newBuffer(), newTexture(),
    newTextureRenderTarget(), newSwapChain().

    \list

    \li The returned value from both create() and functions like newBuffer() is
    owned by the caller.

    \li Unlike QRhi, subclasses of QRhiResource should not be destroyed
    directly via delete without calling QRhiResource::release(). The typical
    approach is to call QRhiResource::releaseAndDestroy(). This is equivalent
    to QRhiResource::release() followed by \c delete.

    \li Just creating a QRhiResource subclass never allocates or initalizes any
    native resources. That is only done when calling the \c build function of a
    subclass, for example, QRhiBuffer::build() or QRhiTexture::build().

    \li The exception is
    QRhiTextureRenderTarget::newCompatibleRenderPassDescriptor() and
    QRhiSwapChain::newCompatibleRenderPassDescriptor(). There is no \c build
    operation for these and the returned object is immediately active.

    \li The resource objects themselves are treated as immutable: once a
    resource is built, changing any parameters via the setters, such as,
    QRhiTexture::setPixelSize(), has no effect, unless the underlying native
    resource is released and \c build is called again. See more about resource
    reuse in the sections below.

    \li The underlying native resources are scheduled for releasing by calling
    QRhiResource::release(). Backends often queue release requests and defer
    executing them to an unspecified time, this is hidden from the
    applications. This way applications do not have to worry about releasing a
    native resource that may still be in use by an in flight frame.

    \endlist

    \badcode
        vbuf = rhi->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(vertexData));
        if (!vbuf->build()) { error }
        ...
        vbuf->releaseAndDestroy();
    \endcode

    \section3 Resource reuse

    From the user's point of view the QRhiResource is reusable immediately
    after calling QRhiResource::release(). With the exception of swapchains,
    calling \c build on an already built object does an implicit release. This
    provides a handy shortcut to reuse a QRhiResource instance with different
    parameters, with a new native graphics resource underneath.

    The importance of reusing the same object lies in the fact that some
    objects reference other objects: for example, a QRhiShaderResourceBindings
    can reference QRhiBuffer, QRhiTexture, and QRhiSampler instances. If now
    one of these buffers need to be resized or a sampler parameter needs
    changing, destroying and creating a whole new QRhiBuffer or QRhiSampler
    would invalidate all references to the old instance. By just changing the
    appropriate parameters via QRhiBuffer::setSize() or similar and then
    calling QRhiBuffer::build(), everything works as expected and there is no
    need to touch the QRhiShaderResourceBindings at all, even though there is a
    good chance that under the hood the QRhiBuffer is now backed by a whole new
    native buffer.

    \badcode
        ubuf = rhi->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 256);
        ubuf->build();

154
        srb = rhi->newShaderResourceBindings()
Laszlo Agocs's avatar
Laszlo Agocs committed
155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226
        srb->setBindings({
            QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage, ubuf)
        });
        srb->build();

        ...

        // now suddenly we need buffer with a different size
        ubuf->setSize(512);
        ubuf->build(); // same as ubuf->release(); ubuf->build();

        // that's it, srb needs no changes whatsoever
    \endcode

    \section3 Pooled objects

    There are pooled objects too, like QRhiResourceUpdateBatch. An instance is
    retrieved via a \c next function, such as, nextResourceUpdateBatch(). The
    caller does not own the returned instance in this case. The only valid way
    of operating here is calling functions on the QRhiResourceUpdateBatch and
    then passing it to QRhiCommandBuffer::beginPass() or
    QRhiCommandBuffer::endPass(). These functions take care of returning the
    batch to the pool. Alternatively, a batch can be "canceled" and returned to
    the pool without processing by calling QRhiResourceUpdateBatch::release().

    A typical pattern is thus:

    \badcode
        QRhiResourceUpdateBatch *resUpdates = rhi->nextResourceUpdateBatch();
        ...
        resUpdates->updateDynamicBuffer(ubuf, 0, 64, mvp.constData());
        if (!image.isNull()) {
            resUpdates->uploadTexture(texture, image);
            image = QImage();
        }
        ...
        QRhiCommandBuffer *cb = m_sc->currentFrameCommandBuffer();
        cb->beginPass(swapchain->currentFrameRenderTarget(), clearCol, clearDs, resUpdates);
    \endcode

    \section3 Swapchain specifics

    QRhiSwapChain features some special semantics due to the peculiar nature of
    swapchains.

    \list

    \li It has no \c build but rather a QRhiSwapChain::buildOrResize().
    Repeatedly calling this function is \b not the same as calling
    QRhiSwapChain::release() followed by QRhiSwapChain::buildOrResize(). This
    is because swapchains often have ways to handle the case where buffers need
    to be resized in a manner that is more efficient than a brute force
    destroying and recreating from scratch.

    \li An active QRhiSwapChain must be released by calling
    QRhiSwapChain::release() whenever the targeted QWindow sends the
    QPlatformSurfaceEvent::SurfaceAboutToBeDestroyed event. It should not be
    postponed since releasing the swapchain may become problematic when the
    native window is not around anymore (e.g. because the QPlatformWindow got
    destroyed already when getting a QWindow::close())

    \endlist

    \section3 Ownership

    The general rule is no ownership transfer. Creating a QRhi with an already
    existing graphics device does not mean the QRhi takes ownership of the
    device object. Similarly, ownership is not given away when a device or
    texture object is "exported" via QRhi::nativeHandles() or
    QRhiTexture::nativeHandles(). Most importantly, passing pointers in structs
    and via setters does not transfer ownership.

Laszlo Agocs's avatar
Laszlo Agocs committed
227
    \section3 Threading and resource sharing
228 229

    A QRhi instance can be created and used on any thread but all usage must be
Laszlo Agocs's avatar
Laszlo Agocs committed
230
    limited to that one single thread.
231

Laszlo Agocs's avatar
Laszlo Agocs committed
232 233 234 235 236 237 238 239 240 241 242
    When it comes to externally created native objects, such as OpenGL contexts
    passed in via QRhiGles2NativeHandles, it is up to the application to ensure
    they are not misused by other threads.

    By default any QRhiResource created from one QRhi must only be used with
    that one QRhi and must be released before the QRhi is destroyed. This rule
    is relaxed when a QRhi is created with an associated
    QRhiResourceSharingHost. From then on any QRhiResource that reports \c true
    from \l{QRhiResource::isShareable()}{isShareable()} is usable with other
    QRhi instances as well, as long as they are associated with the same
    QRhiResourceSharingHost. Resources can also outlive their creating QRhi in
Laszlo Agocs's avatar
Laszlo Agocs committed
243
    this case, as long as there is at least one QRhi left in the sharing group.
Laszlo Agocs's avatar
Laszlo Agocs committed
244

Laszlo Agocs's avatar
Laszlo Agocs committed
245 246 247 248 249 250 251
    \note Support for efficient concurrent access to shared resources from QRhi
    instances operating on different threads, especially when writing (for
    example, rendering to a texture) is involved, is limited for the time
    being. Neither GPU-GPU nor GPU-host synchronization facilities (such as,
    fences or events) are provided in the QRhi API at the moment. These may be
    introduced in the future.

Laszlo Agocs's avatar
Laszlo Agocs committed
252
    \sa {Qt Shader Tools}, QRhiResourceSharingHost
Laszlo Agocs's avatar
Laszlo Agocs committed
253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303
 */

/*!
    \enum QRhi::Implementation
    Describes which graphics API-specific backend gets used by a QRhi instance.

    \value Null
    \value Vulkan
    \value OpenGLES2
    \value D3D11
    \value Metal
 */

/*!
    \enum QRhi::Flag
    Describes what special features to enable.

    \value EnableProfiling Enables gathering timing (CPU, GPU) and resource
    (QRhiBuffer, QRhiTexture, etc.) information and additional metadata. See
    QRhiProfiler. Avoid enabling in production builds as it may involve a
    performance penalty.

    \value EnableDebugMarkers Enables debug marker groups. Without this frame
    debugging features like making debug groups and custom resource name
    visible in external GPU debugging tools will not be available and functions
    like QRhiCommandBuffer::debugMarkBegin() will become a no-op. Avoid
    enabling in production builds as it may involve a performance penalty.
 */

/*!
    \enum QRhi::FrameOpResult
    Describes the result of operations that can have a soft failure.

    \value FrameOpSuccess Success

    \value FrameOpError Unspecified error

    \value FrameOpSwapChainOutOfDate The swapchain is in an inconsistent state
    internally. This can be recoverable by attempting to repeat the operation
    (such as, beginFrame()) later.

    \value FrameOpDeviceLost The graphics device was lost. This can be
    recoverable by attempting to repeat the operation (such as, beginFrame())
    and releasing and reinitializing all objects backed by native graphics
    resources.
 */

/*!
    \enum QRhi::Feature
    Flag values to indicate what features are supported by the backend currently in use.

304 305
    \value MultisampleTexture Indicates that textures with a sample count larger
    than 1 are supported.
306

307 308
    \value MultisampleRenderBuffer Indicates that renderbuffers with a sample
    count larger than 1 are supported.
309

310
    \value DebugMarkers Indicates that debug marker groups (and so
311 312
    QRhiCommandBuffer::debugMarkBegin()) are supported.

313 314
    \value Timestamps Indicates that command buffer timestamps are supported.
    Relevant for QRhiProfiler::gpuFrameTimes().
315

316
    \value Instancing Indicates that instanced drawing is supported.
317

318 319
    \value CustomInstanceStepRate Indicates that instance step rates other than
    1 are supported.
320

321 322
    \value PrimitiveRestart Indicates that restarting the assembly of
    primitives when encountering an index value of 0xFFFF
323 324 325 326 327 328 329 330 331 332 333
    (\l{QRhiCommandBuffer::IndexUInt16}{IndexUInt16}) or 0xFFFFFFFF
    (\l{QRhiCommandBuffer::IndexUInt32}{IndexUInt32}) is always enabled, for
    certain primitive topologies at least. Due to the wildly varying primitive
    restart behavior and support in the underlying graphics APIs, primitive
    restart cannot be controlled with QRhi. Instead, applications must assume
    that whenever this feature is reported as supported, the above mentioned
    index values \c may be treated specially, depending on the topology. The
    only two topologies where primitive restart is guaranteed to behave
    identically across backends, as long as this feature is reported as
    supported, are \l{QRhiGraphicsPipeline::LineStrip}{LineStrip} and
    \l{QRhiGraphicsPipeline::TriangleStrip}{TriangleStrip}.
334 335 336 337 338

    \value GeometryShaders Indicates that geometry shaders are supported.

    \value TessellationShaders Indicates that tessellation control and
    evaluation shaders are supported.
Laszlo Agocs's avatar
Laszlo Agocs committed
339 340
 */

341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357
/*!
    \enum QRhi::BeginFrameFlag
    Flag values for QRhi::beginFrame()
 */

/*!
    \enum QRhi::EndFrameFlag
    Flag values for QRhi::endFrame()

    \value SkipPresent Specifies that no present command is to be queued or no
    swapBuffers call is to be made. This way no image is presented. Generating
    multiple frames with all having this flag set is not recommended (except,
    for example, for benchmarking purposes - but keep in mind that backends may
    behave differently when it comes to waiting for command completion without
    presenting so the results are not comparable between them)
 */

Laszlo Agocs's avatar
Laszlo Agocs committed
358 359 360 361 362 363 364 365 366 367 368 369 370
/*!
    \enum QRhi::ResourceSizeLimit
    Describes the resource limit to query.

    \value TextureSizeMin Minimum texture width and height. This is typically
    1. The minimum texture size is handled gracefully, meaning attempting to
    create a texture with an empty size will instead create a texture with the
    minimum size.

    \value TextureSizeMax Maximum texture width and height. This depends on the
    graphics API and sometimes the platform or implementation as well.
    Typically the value is in the range 4096 - 16384. Attempting to create
    textures larger than this is expected to fail.
Laszlo Agocs's avatar
Laszlo Agocs committed
371 372 373 374 375
 */

/*!
    \class QRhiInitParams
    \inmodule QtRhi
376
    \brief Base class for backend-specific initialization parameters.
377 378 379 380 381 382 383 384 385 386 387

    Contains fields that are relevant to all backends.

    \l resourceSharingHost is set to null by default. Setting it to an actual
    QRhiResourceSharingHost instance is optional. When set, it causes the QRhi
    to share either the graphics device, or, in case of OpenGL, use a context
    that shares resources, with all other QRhi instances that have the same
    QRhiResourceSharingHost set in their QRhiInitParams. This makes the
    underlying graphics resources of QRhiResource subclasses such as
    QRhiTexture visible to all the QRhi instances that use the same
    QRhiResourceSharingHost.
Laszlo Agocs's avatar
Laszlo Agocs committed
388

389
    \sa QRhiResource::isShareable()
Laszlo Agocs's avatar
Laszlo Agocs committed
390 391 392 393 394
 */

/*!
    \class QRhiColorClearValue
    \inmodule QtRhi
395
    \brief Specifies a clear color for a color buffer.
Laszlo Agocs's avatar
Laszlo Agocs committed
396 397
 */

398 399 400
/*!
    Constructs a color clear value with \c{(0, 0, 0, 1)} (opaque black).
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
401 402 403 404 405
QRhiColorClearValue::QRhiColorClearValue()
    : m_rgba(0, 0, 0, 1)
{
}

406 407 408 409
/*!
    Constructs a color clear value with the floating point color components
    (\c{0.0f - 1.0f}) specified in \a c.
  */
Laszlo Agocs's avatar
Laszlo Agocs committed
410 411 412 413 414
QRhiColorClearValue::QRhiColorClearValue(const QVector4D &c)
    : m_rgba(c)
{
}

415 416 417 418
/*!
    Constructs a color clear value with the floating point color components
    (\c{0.0f - 1.0f}) specified in \a r, \a g, \a b, and \a a.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
419 420 421 422 423
QRhiColorClearValue::QRhiColorClearValue(float r, float g, float b, float a)
    : m_rgba(r, g, b, a)
{
}

424
/*!
425
    \return \c true if the colors in the two QRhiColorClearValue objects \a a
426 427 428 429 430 431 432 433 434 435
    and \a b are equal.

    \relates QRhiColorClearValue
 */
bool operator==(const QRhiColorClearValue &a, const QRhiColorClearValue &b) Q_DECL_NOTHROW
{
    return a.rgba() == b.rgba();
}

/*!
436
    \return \c false if the colors in the two QRhiColorClearValue objects \a a
437 438 439 440 441 442 443 444 445 446
    and \a b are equal; otherwise returns \c true.

    \relates QRhiColorClearValue
*/
bool operator!=(const QRhiColorClearValue &a, const QRhiColorClearValue &b) Q_DECL_NOTHROW
{
    return !(a == b);
}

/*!
447
    \return the hash value for \a v, using \a seed to seed the calculation.
448 449 450 451 452 453 454 455 456

    \relates QRhiColorClearValue
 */
uint qHash(const QRhiColorClearValue &v, uint seed) Q_DECL_NOTHROW
{
    const QVector4D c = v.rgba();
    return qFloor((c.x() + c.y() + c.z() + c.w()) * 1000) + seed;
}

Laszlo Agocs's avatar
Laszlo Agocs committed
457 458 459
/*!
    \class QRhiDepthStencilClearValue
    \inmodule QtRhi
460
    \brief Specifies clear values for a depth or stencil buffer.
Laszlo Agocs's avatar
Laszlo Agocs committed
461 462
 */

463 464 465 466
/*!
    Constructs a depth/stencil clear value with depth clear value 1.0f and
    stencil clear value 0.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
467 468 469 470 471 472
QRhiDepthStencilClearValue::QRhiDepthStencilClearValue()
    : m_d(1),
      m_s(0)
{
}

473 474 475 476
/*!
    Constructs a depth/stencil clear value with depth clear value \a d and
    stencil clear value \a s.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
477 478 479 480 481 482
QRhiDepthStencilClearValue::QRhiDepthStencilClearValue(float d, quint32 s)
    : m_d(d),
      m_s(s)
{
}

483
/*!
484
    \return \c true if the values in the two QRhiDepthStencilClearValue objects
485 486 487 488 489 490 491 492 493 494 495
    \a a and \a b are equal.

    \relates QRhiDepthStencilClearValue
 */
bool operator==(const QRhiDepthStencilClearValue &a, const QRhiDepthStencilClearValue &b) Q_DECL_NOTHROW
{
    return a.depthClearValue() == b.depthClearValue()
            && a.stencilClearValue() == b.stencilClearValue();
}

/*!
496
    \return \c false if the values in the two QRhiDepthStencilClearValue
497 498 499 500 501 502 503 504 505 506
    objects \a a and \a b are equal; otherwise returns \c true.

    \relates QRhiDepthStencilClearValue
*/
bool operator!=(const QRhiDepthStencilClearValue &a, const QRhiDepthStencilClearValue &b) Q_DECL_NOTHROW
{
    return !(a == b);
}

/*!
507
    \return the hash value for \a v, using \a seed to seed the calculation.
508 509 510 511 512 513 514 515

    \relates QRhiDepthStencilClearValue
 */
uint qHash(const QRhiDepthStencilClearValue &v, uint seed) Q_DECL_NOTHROW
{
    return seed * (qFloor(v.depthClearValue() * 100) + v.stencilClearValue());
}

Laszlo Agocs's avatar
Laszlo Agocs committed
516 517 518
/*!
    \class QRhiViewport
    \inmodule QtRhi
519
    \brief Specifies a viewport rectangle.
520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537

    Used with QRhiCommandBuffer::setViewport().

    \note QRhi assumes OpenGL-style viewport coordinates, meaning x and y are
    bottom-left.

    Typical usage is like the following:

    \badcode
      const QSize outputSizeInPixels = swapchain->currentPixelSize();
      const QRhiViewport viewport(0, 0, outputSizeInPixels.width(), outputSizeInPixels.height());
      cb->beginPass(swapchain->currentFrameRenderTarget(), { 0, 0, 0, 1 }, { 1, 0 });
      cb->setGraphicsPipeline(ps);
      cb->setViewport(viewport);
      ...
    \endcode

    \sa QRhiCommandBuffer::setViewport(), QRhi::clipSpaceCorrMatrix(), QRhiScissor
Laszlo Agocs's avatar
Laszlo Agocs committed
538 539
 */

540 541 542 543 544 545
/*!
    Constructs a viewport description with a default rectangle and depth range.
    The default depth range is 0.0f - 1.0f.

    \sa QRhi::clipSpaceCorrMatrix()
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
546 547 548 549 550 551 552
QRhiViewport::QRhiViewport()
    : m_rect(0, 0, 1280, 720),
      m_minDepth(0),
      m_maxDepth(1)
{
}

553 554 555 556 557 558 559 560
/*!
    Constructs a viewport description with the rectangle specified by \a x, \a
    y, \a w, \a h and the depth range \a minDepth and \a maxDepth.

    \note x and y are assumed to be the bottom-left position.

    \sa QRhi::clipSpaceCorrMatrix()
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
561 562 563 564 565 566 567
QRhiViewport::QRhiViewport(float x, float y, float w, float h, float minDepth, float maxDepth)
    : m_rect(x, y, w, h),
      m_minDepth(minDepth),
      m_maxDepth(maxDepth)
{
}

568
/*!
569
    \return \c true if the values in the two QRhiViewport objects
570 571 572 573 574 575 576 577 578 579 580 581
    \a a and \a b are equal.

    \relates QRhiViewport
 */
bool operator==(const QRhiViewport &a, const QRhiViewport &b) Q_DECL_NOTHROW
{
    return a.viewport() == b.viewport()
            && a.minDepth() == b.minDepth()
            && a.maxDepth() == b.maxDepth();
}

/*!
582
    \return \c false if the values in the two QRhiViewport
583 584 585 586 587 588 589 590 591 592
    objects \a a and \a b are equal; otherwise returns \c true.

    \relates QRhiViewport
*/
bool operator!=(const QRhiViewport &a, const QRhiViewport &b) Q_DECL_NOTHROW
{
    return !(a == b);
}

/*!
593
    \return the hash value for \a v, using \a seed to seed the calculation.
594 595 596 597 598 599 600 601 602

    \relates QRhiViewport
 */
uint qHash(const QRhiViewport &v, uint seed) Q_DECL_NOTHROW
{
    const QVector4D r = v.viewport();
    return seed + r.x() + r.y() + r.z() + r.w() + qFloor(v.minDepth() * 100) + qFloor(v.maxDepth() * 100);
}

Laszlo Agocs's avatar
Laszlo Agocs committed
603 604 605
/*!
    \class QRhiScissor
    \inmodule QtRhi
606
    \brief Specifies a scissor rectangle.
607 608 609 610 611

    Used with QRhiCommandBuffer::setScissor(). Setting a scissor rectangle is
    only possible with a QRhiGraphicsPipeline that has
    QRhiGraphicsPipeline::UsesScissor set.

Laszlo Agocs's avatar
Laszlo Agocs committed
612
    \note QRhi assumes OpenGL-style scissor coordinates, meaning x and y are
613 614 615
    bottom-left.

    \sa QRhiCommandBuffer::setScissor(), QRhiViewport
Laszlo Agocs's avatar
Laszlo Agocs committed
616 617
 */

618 619 620
/*!
    Constructs an empty scissor.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
621 622 623 624
QRhiScissor::QRhiScissor()
{
}

625 626 627 628 629 630
/*!
    Constructs a scissor with the rectangle specified by \a x, \a y, \a w, and
    \a h.

    \note x and y are assumed to be the bottom-left position.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
631 632 633 634
QRhiScissor::QRhiScissor(int x, int y, int w, int h)
    : m_rect(x, y, w, h)
{
}
Laszlo Agocs's avatar
Laszlo Agocs committed
635

636
/*!
637
    \return \c true if the values in the two QRhiScissor objects
638 639 640 641 642 643 644 645 646 647
    \a a and \a b are equal.

    \relates QRhiScissor
 */
bool operator==(const QRhiScissor &a, const QRhiScissor &b) Q_DECL_NOTHROW
{
    return a.scissor() == b.scissor();
}

/*!
648
    \return \c false if the values in the two QRhiScissor
649 650 651 652 653 654 655 656 657 658
    objects \a a and \a b are equal; otherwise returns \c true.

    \relates QRhiScissor
*/
bool operator!=(const QRhiScissor &a, const QRhiScissor &b) Q_DECL_NOTHROW
{
    return !(a == b);
}

/*!
659
    \return the hash value for \a v, using \a seed to seed the calculation.
660 661 662 663 664 665 666 667 668

    \relates QRhiScissor
 */
uint qHash(const QRhiScissor &v, uint seed) Q_DECL_NOTHROW
{
    const QVector4D r = v.scissor();
    return seed + r.x() + r.y() + r.z() + r.w();
}

Laszlo Agocs's avatar
Laszlo Agocs committed
669
/*!
Laszlo Agocs's avatar
Laszlo Agocs committed
670
    \class QRhiVertexInputBinding
Laszlo Agocs's avatar
Laszlo Agocs committed
671
    \inmodule QtRhi
672
    \brief Describes a vertex input binding.
673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690

    Specifies the stride (in bytes, must be a multiple of 4), the
    classification and optionally the instance step rate.

    As an example, assume a vertex shader with the following inputs:

    \badcode
        layout(location = 0) in vec4 position;
        layout(location = 1) in vec2 texcoord;
    \endcode

    Now let's assume also that 3 component vertex positions \c{(x, y, z)} and 2
    component texture coordinates \c{(u, v)} are provided in a non-interleaved
    format in a buffer (or separate buffers even). Definining two bindings
    could then be done like this:

    \badcode
        QRhiVertexInputLayout inputLayout;
Laszlo Agocs's avatar
Laszlo Agocs committed
691
        inputLayout.setBindings({
692 693
            { 3 * sizeof(float) },
            { 2 * sizeof(float) }
Laszlo Agocs's avatar
Laszlo Agocs committed
694
        });
695 696 697
    \endcode

    Only the stride is interesting here since instancing is not used. The
Laszlo Agocs's avatar
Laszlo Agocs committed
698
    binding number is given by the index of the QRhiVertexInputBinding
699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
    element in the bindings vector of the QRhiVertexInputLayout.

    Once a graphics pipeline with this vertex input layout is bound, the vertex
    inputs could be set up like the following for drawing a cube with 36
    vertices, assuming we have a single buffer with first the positions and
    then the texture coordinates:

    \badcode
        cb->setVertexInput(0, { { cubeBuf, 0 }, { cubeBuf, 36 * 3 * sizeof(float) } });
    \endcode

    Note how the index defined by \c {startBinding + i}, where \c i is the
    index in the second argument of
    \l{QRhiCommandBuffer::setVertexInput()}{setVertexInput()}, matches the
    index of the corresponding entry in the \c bindings vector of the
    QRhiVertexInputLayout.

    \note the stride must always be a multiple of 4.

    \sa QRhiCommandBuffer::setVertexInput()
Laszlo Agocs's avatar
Laszlo Agocs committed
719 720
 */

Laszlo Agocs's avatar
Laszlo Agocs committed
721
/*!
Laszlo Agocs's avatar
Laszlo Agocs committed
722
    \enum QRhiVertexInputBinding::Classification
Laszlo Agocs's avatar
Laszlo Agocs committed
723 724 725 726 727 728
    Describes the input data classification.

    \value PerVertex Data is per-vertex
    \value PerInstance Data is per-instance
 */

729 730 731
/*!
    Constructs an empty vertex input binding description.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
732 733 734 735
QRhiVertexInputBinding::QRhiVertexInputBinding()
{
}

736 737 738 739 740 741 742
/*!
    Constructs a vertex input binding description with the specified \a stride,
    classification \a cls, and instance step rate \a stepRate.

    \note \a stepRate other than 1 is only supported when
    QRhi::CustomInstanceStepRate is reported to be supported.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
743 744 745 746 747 748 749
QRhiVertexInputBinding::QRhiVertexInputBinding(quint32 stride, Classification cls, int stepRate)
    : m_stride(stride),
      m_classification(cls),
      m_instanceStepRate(stepRate)
{
}

750
/*!
751
    \return \c true if the values in the two QRhiVertexInputBinding objects
752 753 754 755 756 757 758 759 760 761 762 763
    \a a and \a b are equal.

    \relates QRhiVertexInputBinding
 */
bool operator==(const QRhiVertexInputBinding &a, const QRhiVertexInputBinding &b) Q_DECL_NOTHROW
{
    return a.stride() == b.stride()
            && a.classification() == b.classification()
            && a.instanceStepRate() == b.instanceStepRate();
}

/*!
764
    \return \c false if the values in the two QRhiVertexInputBinding
765 766 767 768 769 770 771 772 773 774
    objects \a a and \a b are equal; otherwise returns \c true.

    \relates QRhiVertexInputBinding
*/
bool operator!=(const QRhiVertexInputBinding &a, const QRhiVertexInputBinding &b) Q_DECL_NOTHROW
{
    return !(a == b);
}

/*!
775
    \return the hash value for \a v, using \a seed to seed the calculation.
776 777 778 779 780 781 782 783

    \relates QRhiVertexInputBinding
 */
uint qHash(const QRhiVertexInputBinding &v, uint seed) Q_DECL_NOTHROW
{
    return seed + v.stride() + v.classification();
}

Laszlo Agocs's avatar
Laszlo Agocs committed
784
/*!
Laszlo Agocs's avatar
Laszlo Agocs committed
785
    \class QRhiVertexInputAttribute
Laszlo Agocs's avatar
Laszlo Agocs committed
786
    \inmodule QtRhi
787
    \brief Describes a single vertex input element.
788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809

    The members specify the binding number, location, format, and offset for a
    single vertex input element.

    \note For HLSL it is assumed that the vertex shader uses
    \c{TEXCOORD<location>} as the semantic for each input. Hence no separate
    semantic name and index.

    As an example, assume a vertex shader with the following inputs:

    \badcode
        layout(location = 0) in vec4 position;
        layout(location = 1) in vec2 texcoord;
    \endcode

    Now let's assume that we have 3 component vertex positions \c{(x, y, z)}
    and 2 component texture coordinates \c{(u, v)} are provided in a
    non-interleaved format in a buffer (or separate buffers even). Once two
    bindings are defined, the attributes could be specified as:

    \badcode
        QRhiVertexInputLayout inputLayout;
Laszlo Agocs's avatar
Laszlo Agocs committed
810
        inputLayout.setBindings({
811 812
            { 3 * sizeof(float) },
            { 2 * sizeof(float) }
Laszlo Agocs's avatar
Laszlo Agocs committed
813 814 815 816 817
        });
        inputLayout.setAttributes({
            { 0, 0, QRhiVertexInputAttribute::Float3, 0 },
            { 1, 1, QRhiVertexInputAttribute::Float2, 0 }
        });
818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834
    \endcode

    Once a graphics pipeline with this vertex input layout is bound, the vertex
    inputs could be set up like the following for drawing a cube with 36
    vertices, assuming we have a single buffer with first the positions and
    then the texture coordinates:

    \badcode
        cb->setVertexInput(0, { { cubeBuf, 0 }, { cubeBuf, 36 * 3 * sizeof(float) } });
    \endcode

    When working with interleaved data, there will typically be just one
    binding, with multiple attributes refering to that same buffer binding
    point:

    \badcode
        QRhiVertexInputLayout inputLayout;
Laszlo Agocs's avatar
Laszlo Agocs committed
835
        inputLayout.setBindings({
836
            { 5 * sizeof(float) }
Laszlo Agocs's avatar
Laszlo Agocs committed
837 838 839 840 841
        });
        inputLayout.setAttributes({
            { 0, 0, QRhiVertexInputAttribute::Float3, 0 },
            { 0, 1, QRhiVertexInputAttribute::Float2, 3 * sizeof(float) }
        });
842 843 844 845 846 847 848 849 850
    \endcode

    and then:

    \badcode
        cb->setVertexInput(0, { { interleavedCubeBuf, 0 } });
    \endcode

    \sa QRhiCommandBuffer::setVertexInput()
Laszlo Agocs's avatar
Laszlo Agocs committed
851 852
 */

Laszlo Agocs's avatar
Laszlo Agocs committed
853
/*!
Laszlo Agocs's avatar
Laszlo Agocs committed
854
    \enum QRhiVertexInputAttribute::Format
Laszlo Agocs's avatar
Laszlo Agocs committed
855 856 857 858 859 860 861 862 863 864 865
    Specifies the type of the element data.

    \value Float4 Four component float vector
    \value Float3 Three component float vector
    \value Float2 Two component float vector
    \value Float Float
    \value UNormByte4 Four component normalized unsigned byte vector
    \value UNormByte2 Two component normalized unsigned byte vector
    \value UNormByte Normalized unsigned byte
 */

866 867 868
/*!
    Constructs an empty vertex input attribute description.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
869 870 871 872
QRhiVertexInputAttribute::QRhiVertexInputAttribute()
{
}

873 874 875 876
/*!
    Constructs a vertex input attribute description with the specified \a
    binding number, \a location, \a format, and \a offset.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
877 878 879 880 881 882 883 884
QRhiVertexInputAttribute::QRhiVertexInputAttribute(int binding, int location, Format format, quint32 offset)
    : m_binding(binding),
      m_location(location),
      m_format(format),
      m_offset(offset)
{
}

885
/*!
886
    \return \c true if the values in the two QRhiVertexInputAttribute objects
887 888 889 890 891 892 893 894 895 896 897 898 899
    \a a and \a b are equal.

    \relates QRhiVertexInputAttribute
 */
bool operator==(const QRhiVertexInputAttribute &a, const QRhiVertexInputAttribute &b) Q_DECL_NOTHROW
{
    return a.binding() == b.binding()
            && a.location() == b.location()
            && a.format() == b.format()
            && a.offset() == b.offset();
}

/*!
900
    \return \c false if the values in the two QRhiVertexInputAttribute
901 902 903 904 905 906 907 908 909 910
    objects \a a and \a b are equal; otherwise returns \c true.

    \relates QRhiVertexInputAttribute
*/
bool operator!=(const QRhiVertexInputAttribute &a, const QRhiVertexInputAttribute &b) Q_DECL_NOTHROW
{
    return !(a == b);
}

/*!
911
    \return the hash value for \a v, using \a seed to seed the calculation.
912 913 914 915 916 917 918 919

    \relates QRhiVertexInputAttribute
 */
uint qHash(const QRhiVertexInputAttribute &v, uint seed) Q_DECL_NOTHROW
{
    return seed + v.binding() + v.location() + v.format() + v.offset();
}

Laszlo Agocs's avatar
Laszlo Agocs committed
920 921 922 923
/*!
    \class QRhiVertexInputLayout
    \inmodule QtRhi
    \brief Describes the layout of vertex inputs consumed by a vertex shader.
924 925 926

    The vertex input layout is defined by the collections of
    QRhiVertexInputBinding and QRhiVertexInputAttribute.
Laszlo Agocs's avatar
Laszlo Agocs committed
927 928
 */

929 930 931
/*!
    Constructs an empty vertex input layout description.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
932 933 934 935
QRhiVertexInputLayout::QRhiVertexInputLayout()
{
}

936
/*!
937
    \return \c true if the values in the two QRhiVertexInputLayout objects
938 939 940 941 942 943 944 945 946 947 948
    \a a and \a b are equal.

    \relates QRhiVertexInputLayout
 */
bool operator==(const QRhiVertexInputLayout &a, const QRhiVertexInputLayout &b) Q_DECL_NOTHROW
{
    return a.bindings() == b.bindings()
            && a.attributes() == b.attributes();
}

/*!
949
    \return \c false if the values in the two QRhiVertexInputLayout
950 951 952 953 954 955 956 957 958 959
    objects \a a and \a b are equal; otherwise returns \c true.

    \relates QRhiVertexInputLayout
*/
bool operator!=(const QRhiVertexInputLayout &a, const QRhiVertexInputLayout &b) Q_DECL_NOTHROW
{
    return !(a == b);
}

/*!
960
    \return the hash value for \a v, using \a seed to seed the calculation.
961 962 963 964 965 966 967 968

    \relates QRhiVertexInputLayout
 */
uint qHash(const QRhiVertexInputLayout &v, uint seed) Q_DECL_NOTHROW
{
    return qHash(v.bindings(), seed) + qHash(v.attributes(), seed);
}

Laszlo Agocs's avatar
Laszlo Agocs committed
969 970 971
/*!
    \class QRhiGraphicsShaderStage
    \inmodule QtRhi
972
    \brief Specifies the type and the shader code for a shader stage in the graphics pipeline.
973

974 975 976 977
    \note Some backends only support a subset of the stages. Use
    QRhi::isFeatureSupported() to query for support at runtime. For example,
    Metal has no geometry shader support, while the OpenGL 2.x backend only
    supports the vertex and fragment stages.
Laszlo Agocs's avatar
Laszlo Agocs committed
978 979
 */

Laszlo Agocs's avatar
Laszlo Agocs committed
980 981 982 983 984 985
/*!
    \enum QRhiGraphicsShaderStage::Type
    Specifies the type of the shader stage.

    \value Vertex Vertex stage
    \value Fragment Fragment (pixel) stage
986
    \value Geometry Geometry stage
Laszlo Agocs's avatar
Laszlo Agocs committed
987 988 989 990
    \value TessellationControl Tessellation control (hull) stage
    \value TessellationEvaluation Tessellation evaluation (domain) stage
 */

991 992 993
/*!
    Constructs an empty shader stage description.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
994 995 996
QRhiGraphicsShaderStage::QRhiGraphicsShaderStage()
{
}
997

998 999 1000
/*!
    Constructs a shader stage description with the \a type of the stage and the
    \a shader.
1001 1002 1003 1004 1005

    The shader variant \a v defaults to QBakedShaderKey::StandardShader. A
    QBakedShader pack contains multiple source and binary versions of a shader.
    In addition, it can also contain variants of the shader with slightly
    modified code. \a v can then be used to select the desired variant.
1006
 */
1007
QRhiGraphicsShaderStage::QRhiGraphicsShaderStage(Type type, const QBakedShader &shader, QBakedShaderKey::ShaderVariant v)
Laszlo Agocs's avatar
Laszlo Agocs committed
1008
    : m_type(type),
1009 1010
      m_shader(shader),
      m_shaderVariant(v)
Laszlo Agocs's avatar
Laszlo Agocs committed
1011 1012
{
}
Laszlo Agocs's avatar
Laszlo Agocs committed
1013

1014
/*!
1015
    \return \c true if the values in the two QRhiGraphicsShaderStage objects
1016 1017 1018 1019 1020 1021 1022
    \a a and \a b are equal.

    \relates QRhiGraphicsShaderStage
 */
bool operator==(const QRhiGraphicsShaderStage &a, const QRhiGraphicsShaderStage &b) Q_DECL_NOTHROW
{
    return a.type() == b.type()
1023 1024
            && a.shader() == b.shader()
            && a.shaderVariant() == b.shaderVariant();
1025 1026 1027
}

/*!
1028
    \return \c false if the values in the two QRhiGraphicsShaderStage
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038
    objects \a a and \a b are equal; otherwise returns \c true.

    \relates QRhiGraphicsShaderStage
*/
bool operator!=(const QRhiGraphicsShaderStage &a, const QRhiGraphicsShaderStage &b) Q_DECL_NOTHROW
{
    return !(a == b);
}

/*!
1039
    \return the hash value for \a v, using \a seed to seed the calculation.
1040 1041 1042 1043 1044

    \relates QRhiGraphicsShaderStage
 */
uint qHash(const QRhiGraphicsShaderStage &v, uint seed) Q_DECL_NOTHROW
{
1045
    return v.type() + qHash(v.shader(), seed) + v.shaderVariant();
1046 1047
}

Laszlo Agocs's avatar
Laszlo Agocs committed
1048
/*!
Laszlo Agocs's avatar
Laszlo Agocs committed
1049
    \class QRhiColorAttachment
Laszlo Agocs's avatar
Laszlo Agocs committed
1050
    \inmodule QtRhi
1051 1052 1053
    \brief Describes the a single color attachment of a render target.

    A color attachment is either a QRhiTexture or a QRhiRenderBuffer. The
Laszlo Agocs's avatar
Laszlo Agocs committed
1054
    former, when texture() is set, is used in most cases.
1055

Laszlo Agocs's avatar
Laszlo Agocs committed
1056 1057
    \note texture() and renderBuffer() cannot be both set (be non-null at the
    same time).
1058 1059 1060 1061 1062 1063 1064 1065

    Setting renderBuffer instead is recommended only when multisampling is
    needed. Relying on QRhi::MultisampleRenderBuffer is a better choice than
    QRhi::MultisampleTexture in practice since the former is available in more
    run time configurations (e.g. when running on OpenGL ES 3.0 which has no
    support for multisample textures, but does support multisample
    renderbuffers).

Laszlo Agocs's avatar
Laszlo Agocs committed
1066
    When targeting a non-multisample texture, the layer() and level()
1067 1068 1069
    indicate the targeted layer (face index \c{0-5} for cubemaps) and mip
    level.

Laszlo Agocs's avatar
Laszlo Agocs committed
1070
    When texture() or renderBuffer() is multisample, resolveTexture() can be
1071 1072 1073 1074 1075 1076 1077
    set optionally. When set, samples are resolved automatically into that
    (non-multisample) texture at the end of the render pass. When rendering
    into a multisample renderbuffers, this is the only way to get resolved,
    non-multisample content out of them. Multisample textures allow sampling in
    shaders so for them this is just one option.

    \note when resolving is enabled, the multisample data may not be written
Laszlo Agocs's avatar
Laszlo Agocs committed
1078 1079
    out at all. This means that the multisample texture() must not be used
    afterwards with shaders for sampling when resolveTexture() is set.
Laszlo Agocs's avatar
Laszlo Agocs committed
1080 1081
 */

1082 1083 1084
/*!
    Constructs an empty color attachment description.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1085 1086 1087 1088
QRhiColorAttachment::QRhiColorAttachment()
{
}

1089 1090 1091 1092
/*!
    Constructs a color attachment description that specifies \a texture as the
    associated color buffer.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1093 1094 1095 1096 1097
QRhiColorAttachment::QRhiColorAttachment(QRhiTexture *texture)
    : m_texture(texture)
{
}

1098 1099 1100 1101
/*!
    Constructs a color attachment description that specifies \a renderBuffer as
    the associated color buffer.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119
QRhiColorAttachment::QRhiColorAttachment(QRhiRenderBuffer *renderBuffer)
    : m_renderBuffer(renderBuffer)
{
}

/*!
    \class QRhiTextureRenderTargetDescription
    \inmodule QtRhi
    \brief Describes the color and depth or depth/stencil attachments of a render target.

    A texture render target has zero or more textures as color attachments,
    zero or one renderbuffer as combined depth/stencil buffer or zero or one
    texture as depth buffer.

    \note depthStencilBuffer() and depthTexture() cannot be both set (cannot be
    non-null at the same time).
 */

1120 1121 1122
/*!
    Constructs an empty texture render target description.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1123 1124 1125 1126
QRhiTextureRenderTargetDescription::QRhiTextureRenderTargetDescription()
{
}

1127 1128 1129 1130
/*!
    Constructs a texture render target description with one attachment
    described by \a colorAttachment.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1131 1132 1133 1134 1135
QRhiTextureRenderTargetDescription::QRhiTextureRenderTargetDescription(const QRhiColorAttachment &colorAttachment)
{
    m_colorAttachments.append(colorAttachment);
}

1136 1137 1138 1139 1140
/*!
    Constructs a texture render target description with two attachments, a
    color attachment described by \a colorAttachment, and a depth/stencil
    attachment with \a depthStencilBuffer.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1141 1142 1143 1144 1145 1146 1147
QRhiTextureRenderTargetDescription::QRhiTextureRenderTargetDescription(const QRhiColorAttachment &colorAttachment,
                                                                       QRhiRenderBuffer *depthStencilBuffer)
    : m_depthStencilBuffer(depthStencilBuffer)
{
    m_colorAttachments.append(colorAttachment);
}

1148 1149 1150 1151 1152 1153 1154 1155
/*!
    Constructs a texture render target description with two attachments, a
    color attachment described by \a colorAttachment, and a depth attachment
    with \a depthTexture.

    \note \a depthTexture must have a suitable format, such as QRhiTexture::D16
    or QRhiTexture::D32.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191
QRhiTextureRenderTargetDescription::QRhiTextureRenderTargetDescription(const QRhiColorAttachment &colorAttachment,
                                                                       QRhiTexture *depthTexture)
    : m_depthTexture(depthTexture)
{
    m_colorAttachments.append(colorAttachment);
}

/*!
    \class QRhiTextureMipLevel
    \inmodule QtRhi
    \brief Describes one mip level in a layer in a texture upload operation.

    The source content is specified either as a QImage or as a raw blob. The
    former is only allowed for uncompressed textures, while the latter is only
    supported for compressed ones.

    \note image() and compressedData() cannot be both set at the same time.

    destinationTopLeft() specifies the top-left corner of the target
    rectangle. Defaults to (0, 0).

    An empty sourceSize() (the default) indicates that size is assumed to be
    the size of the subresource. For uncompressed textures this implies that
    the size of the source image() must match the subresource. For compressed
    textures sufficient amount of data must be provided in compressedData().

    \note With compressed textures the first upload must always match the
    subresource size due to graphics API limitations with some backends.

    sourceTopLeft() is is only supported for uncompressed textures, and
    specifies the top-left corner of the source rectangle.

    \note Setting sourceSize() or sourceTopLeft() may trigger a QImage copy
    internally, depending on the format and the backend.
 */

1192 1193 1194
/*!
    Constructs an empty mip level description.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1195 1196 1197 1198
QRhiTextureMipLevel::QRhiTextureMipLevel()
{
}

1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210
/*!
    Constructs a mip level description with a \a image.

    The \l{QImage::size()}{size} of \a image must match the size of the mip
    level. For level 0 that is the \l{QRhiTexture::pixelSize()}{texture size}.

    The bit depth of \a image must be compatible with the
    \l{QRhiTexture::Format}{texture format}.

    To describe a partial upload, call setSourceSize(), setSourceTopLeft(), or
    setDestinationTopLeft() afterwards.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1211 1212 1213 1214 1215
QRhiTextureMipLevel::QRhiTextureMipLevel(const QImage &image)
    : m_image(image)
{
}

1216 1217 1218 1219
/*!
    Constructs a mip level description suitable for compressed textures. The
    compressed data is specified in \a compressedData.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230
QRhiTextureMipLevel::QRhiTextureMipLevel(const QByteArray &compressedData)
    : m_compressedData(compressedData)
{
}

/*!
    \class QRhiTextureLayer
    \inmodule QtRhi
    \brief Describes one layer (face for cubemaps) in a texture upload operation.
 */

1231 1232 1233
/*!
    Constructs an empty texture layer description.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1234 1235 1236 1237
QRhiTextureLayer::QRhiTextureLayer()
{
}

1238 1239 1240 1241
/*!
    Constructs a texture layer description with the specified list of \a
    mipImages.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1242 1243 1244 1245 1246
QRhiTextureLayer::QRhiTextureLayer(const QVector<QRhiTextureMipLevel> &mipImages)
    : m_mipImages(mipImages)
{
}

Laszlo Agocs's avatar
Laszlo Agocs committed
1247 1248 1249
/*!
    \class QRhiTextureUploadDescription
    \inmodule QtRhi
1250
    \brief Describes a texture upload operation.
1251

1252 1253 1254 1255 1256 1257 1258 1259
    Used with QRhiResourceUpdateBatch::uploadTexture(). That function has two
    variants: one taking a QImage and one taking a
    QRhiTextureUploadDescription. The former is a convenience version,
    internally creating a QRhiTextureUploadDescription with a single layer and
    a single image in that layer. However, when cubemaps, pre-generated mip
    images, or compressed textures are involved, applications will have to work
    directly with this class instead.

1260 1261
    \note Cubemaps have one layer for each of the six faces in the order +X,
    -X, +Y, -Y, +Z, -Z.
1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287

    For example, specifying the faces of a cubemap could look like the following:

    \badcode
        QImage faces[6];
        ...
        QVector<QRhiTextureLayer> layers;
        for (int i = 0; i < 6; ++i)
          layers.append(QRhiTextureLayer({ QRhiTextureMipLevel(faces[i]) });
        QRhiTextureUploadDescription desc(layers);
        resourceUpdates->uploadTexture(texture, desc);
    \endcode

    Another example that specifies mip images for a compressed texture:

    \badcode
        QVector<QRhiTextureMipLevel> mipImages;
        const int mipCount = rhi->mipLevelsForSize(compressedTexture->pixelSize());
        for (int level = 0; level < mipCount; ++level) {
            const QByteArray compressedDataForLevel = ...
            mipImages.append(QRhiTextureMipLevel(compressedDataForLevel));
        }
        QRhiTextureLayer layer(mipImages);
        QRhiTextureUploadDescription desc({ layer });
        resourceUpdates->uploadTexture(compressedTexture, desc);
    \endcode
Laszlo Agocs's avatar
Laszlo Agocs committed
1288 1289
 */

1290 1291 1292
/*!
    Constructs an empty texture upload description.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1293 1294 1295
QRhiTextureUploadDescription::QRhiTextureUploadDescription()
{
}
1296

1297 1298 1299 1300
/*!
    Constructs a texture upload description with the specified list of \a
    layers.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1301 1302 1303 1304
QRhiTextureUploadDescription::QRhiTextureUploadDescription(const QVector<QRhiTextureLayer> &layers)
    : m_layers(layers)
{
}
Laszlo Agocs's avatar
Laszlo Agocs committed
1305 1306 1307 1308

/*!
    \class QRhiTextureCopyDescription
    \inmodule QtRhi
1309
    \brief Describes a texture-to-texture copy operation.
1310

1311 1312 1313
    An empty pixelSize() indicates that the entire subresource is to be copied.
    A default constructed copy description therefore leads to copying the
    entire subresource at level 0 of layer 0.
1314 1315 1316

    \note The source texture must be created with
    QRhiTexture::UsedAsTransferSource.
1317 1318 1319 1320

    \note The source and destination rectangles defined by pixelSize(),
    sourceTopLeft(), and destinationTopLeft() must fit the source and
    destination textures, respectively. The behavior is undefined otherwise.
Laszlo Agocs's avatar
Laszlo Agocs committed
1321 1322
 */

1323 1324 1325
/*!
    Constructs an empty texture copy description.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1326 1327 1328 1329
QRhiTextureCopyDescription::QRhiTextureCopyDescription()
{
}

Laszlo Agocs's avatar
Laszlo Agocs committed
1330 1331 1332
/*!
    \class QRhiReadbackDescription
    \inmodule QtRhi
1333
    \brief Describes a readback (reading back texture contents from possibly GPU-only memory) operation.
1334 1335

    The source of the readback operation is either a QRhiTexture or the
1336 1337
    current backbuffer of the currently targeted QRhiSwapChain. When
    texture() is not set, the swapchain is used. Otherwise the specified
1338 1339 1340 1341 1342 1343 1344 1345
    QRhiTexture is treated as the source.

    \note Textures used in readbacks must be created with
    QRhiTexture::UsedAsTransferSource.

    \note Swapchains used in readbacks must be created with
    QRhiSwapChain::UsedAsTransferSource.

1346
    layer() and level() are only applicable when the source is a QRhiTexture.
1347 1348 1349

    \note Multisample textures cannot be read back. Readbacks are supported for
    multisample swapchain buffers however.
Laszlo Agocs's avatar
Laszlo Agocs committed
1350 1351
 */

1352 1353 1354 1355 1356 1357 1358 1359 1360
/*!
    Constructs an empty texture readback description.

    \note The source texture is set to null by default, which is still a valid
    readback: it specifies that the backbuffer of the current swapchain is to
    be read back. (current meaning the frame's target swapchain at the time of
    committing the QRhiResourceUpdateBatch with the
    \l{QRhiResourceUpdateBatch::readBackTexture()}{texture readback} on it)
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1361 1362 1363 1364
QRhiReadbackDescription::QRhiReadbackDescription()
{
}

1365 1366 1367 1368 1369 1370 1371
/*!
    Constructs an texture readback description that specifies that level 0 of
    layer 0 of \a texture is to be read back.

    \note \a texture can also be null in which case this constructor is
    identical to the argumentless variant.
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1372 1373 1374 1375 1376
QRhiReadbackDescription::QRhiReadbackDescription(QRhiTexture *texture)
    : m_texture(texture)
{
}

Laszlo Agocs's avatar
Laszlo Agocs committed
1377 1378 1379
/*!
    \class QRhiReadbackResult
    \inmodule QtRhi
1380
    \brief Describes the results of a potentially asynchronous readback operation.
1381 1382 1383 1384

    When \l completed is set, the function is invoked when the \l data is
    available. \l format and \l pixelSize are set upon completion together with
    \l data.
Laszlo Agocs's avatar
Laszlo Agocs committed
1385 1386 1387 1388 1389
 */

/*!
    \class QRhiNativeHandles
    \inmodule QtRhi
1390
    \brief Base class for classes exposing backend-specific collections of native resource objects.
Laszlo Agocs's avatar
Laszlo Agocs committed
1391 1392 1393 1394 1395
 */

/*!
    \class QRhiResource
    \inmodule QtRhi
1396
    \brief Base class for classes encapsulating native resource objects.
Laszlo Agocs's avatar
Laszlo Agocs committed
1397 1398 1399
 */

/*!
Laszlo Agocs's avatar
Laszlo Agocs committed
1400
    \internal
Laszlo Agocs's avatar
Laszlo Agocs committed
1401
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1402 1403 1404 1405
QRhiResource::QRhiResource(QRhiImplementation *rhi_)
    : rhi(rhi_)
{
}
Laszlo Agocs's avatar
Laszlo Agocs committed
1406

1407
/*!
Laszlo Agocs's avatar
Laszlo Agocs committed
1408
   Destructor.
1409
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1410 1411 1412
QRhiResource::~QRhiResource()
{
}
1413

Laszlo Agocs's avatar
Laszlo Agocs committed
1414
/*!
Laszlo Agocs's avatar
Laszlo Agocs committed
1415
    \fn void QRhiResource::release()
Laszlo Agocs's avatar
Laszlo Agocs committed
1416

Laszlo Agocs's avatar
Laszlo Agocs committed
1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468
    Releases the underlying native graphics resources. Safe to call multiple
    times, subsequent invocations will be a no-op then.

    Once release() is called, the QRhiResource instance can be reused, by
    calling the appropriate \c build() function again, or destroyed.
 */

/*!
    Releases native graphics resources, if there is any, and destroys the
    QRhiResource. Equivalent to \c{r->release(); delete r; }.
 */
void QRhiResource::releaseAndDestroy()
{
    release();
    delete this;
}

/*!
    \return the currently set object name. By default the name is empty.
 */
QByteArray QRhiResource::name() const
{
    return objectName;
}

/*!
    Sets a \a name for the object.

    This has two uses: to get descriptive names for the native graphics
    resources visible in graphics debugging tools, such as
    \l{https://renderdoc.org/}{RenderDoc} and
    \l{https://developer.apple.com/xcode/}{XCode}, and in the output stream of
    QRhiProfiler.

    When it comes to naming native objects by relaying the name via the
    appropriate graphics API, note that the name is ignored when
    QRhi::DebugMarkers are not supported, and may, depending on the backend,
    also be ignored when QRhi::EnableDebugMarkers is not set.

    \note The name may be ignored for objects other than buffers,
    renderbuffers, and textures, depending on the backend.

    \note The name may be modified. For slotted resources, such as a QRhiBuffer
    backed by multiple native buffers, QRhi will append a suffix to make the
    underlying native buffers easily distinguishable from each other.
 */
void QRhiResource::setName(const QByteArray &name)
{
    objectName = name;
    objectName.replace(',', '_'); // cannot contain comma for QRhiProfiler
}

Laszlo Agocs's avatar
Laszlo Agocs committed
1469
/*!
1470
    \return true if this resource is shareable between QRhi instances via a
Laszlo Agocs's avatar
Laszlo Agocs committed
1471 1472 1473
    QRhiResourceSharingHost. It also means that such an QRhiResource can
    outlive the QRhi on which it was created.

1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484
    \note Once a shareable QRhiResource is \c orphaned, meaning that the QRhi
    from which it was created gets destroyed, \c{build()} is not a valid
    operation anymore. The QRhiResource can then only be used in graphics
    operations (as the underlying graphics objects are still there and valid)
    or can be released, as long as the QRhiResourceSharingHost,
    with which the creator QRhi was associated with, has at least one
    associated QRhi alive.

    \note Shareable resources typically include buffers, textures, samplers,
    and renderbuffers. Most backends will not support other type of shareable
    resources.
Laszlo Agocs's avatar
Laszlo Agocs committed
1485

1486
    \sa QRhiResourceSharingHost
Laszlo Agocs's avatar
Laszlo Agocs committed
1487
 */
1488
bool QRhiResource::isShareable() const
Laszlo Agocs's avatar
Laszlo Agocs committed
1489 1490 1491 1492
{
    return false;
}

Laszlo Agocs's avatar
Laszlo Agocs committed
1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509
/*!
    \class QRhiBuffer
    \inmodule QtRhi
    \brief Vertex, index, or uniform (constant) buffer resource.
 */

/*!
    \enum QRhiBuffer::Type
    Specifies type of buffer resource.

    \value Immutable Indicates that the data is not expected to change ever
    after the initial upload. Under the hood such buffer resources are
    typically placed in device local (GPU) memory (on systems where
    applicable). Uploading new data is possible, but frequent changes can be
    expensive. Upload typically happens by copying to a separate, host visible
    staging buffer from which a GPU buffer-to-buffer copy is issued into the
    actual GPU-only buffer.
Laszlo Agocs's avatar
Laszlo Agocs committed
1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533

    \value Static Indicates that the data is expected to change only
    infrequently. Typically placed in device local (GPU) memory, where
    applicable. On backends where host visible staging buffers are used for
    uploading, the staging buffers are kept around for this type, unlike with
    Immutable, so subsequent uploads do not suffer in performance. Frequent
    updates should be avoided.

    \value Dynamic Indicates that the data is expected to change frequently.
    Not recommended for large buffers. Typically backed by host visible memory
    in 2 copies in order to allow for changing without stalling the graphics
    pipeline. The double buffering is managed transparently to the applications
    and is not exposed in the API here in any form.
 */

/*!
    \enum QRhiBuffer::UsageFlag
    Flag values to specify how the buffer is going to be used.

    \value VertexBuffer Vertex buffer
    \value IndexBuffer Index buffer
    \value UniformBuffer Uniform (constant) buffer
 */

Laszlo Agocs's avatar
Laszlo Agocs committed
1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629
/*!
    \fn void QRhiBuffer::setSize(int sz)

    Sets the size of the buffer in bytes. The size is normally specified in
    QRhi::newBuffer() so this function is only used when the size has to be
    changed. As with other setters, the size only takes effect when calling
    build(), and for already built buffers this involves releasing the previous
    native resource and creating new ones under the hood.

    Backends may choose to allocate buffers bigger than \a sz in order to
    fulfill alignment requirements. This is hidden from the applications and
    size() will always report the size requested in \a sz.
 */

/*!
    \internal
 */
QRhiBuffer::QRhiBuffer(QRhiImplementation *rhi, Type type_, UsageFlags usage_, int size_)
    : QRhiResource(rhi),
      m_type(type_), m_usage(usage_), m_size(size_)
{
}

/*!
    \fn bool QRhiBuffer::build()

    Creates the corresponding native graphics resources. If there are already
    resources present due to an earlier build() with no corresponding
    release(), then release() is called implicitly first.

    \return \c true when successful, \c false when a graphics operation failed.
    Regardless of the return value, calling release() is always safe.
 */

/*!
    \class QRhiRenderBuffer
    \inmodule QtRhi
    \brief Renderbuffer resource.

    Renderbuffers cannot be sampled or read but have some benefits over
    textures in some cases:

    A DepthStencil renderbuffer may be lazily allocated and be backed by
    transient memory with some APIs. On some platforms this may mean the
    depth/stencil buffer uses no physical backing at all.

    Color renderbuffers are useful since QRhi::MultisampleRenderBuffer may be
    supported even when QRhi::MultisampleTexture is not.

    How the renderbuffer is implemented by a backend is not exposed to the
    applications. In some cases it may be backed by ordinary textures, while in
    others there may be a different kind of native resource used.
 */

/*!
    \enum QRhiRenderBuffer::Type
    Specifies the type of the renderbuffer

    \value DepthStencil Combined depth/stencil
    \value Color Color
 */

/*!
    \enum QRhiRenderBuffer::Flag
    Flag values for flags() and setFlags()

    \value UsedWithSwapChainOnly For DepthStencil renderbuffers this indicates
    that the renderbuffer is only used in combination with a QRhiSwapChain and
    never in other ways. Relevant with some backends, while others ignore it.
    With OpenGL where a separate windowing system interface API is in use (EGL,
    GLX, etc.), the flag is important since it avoids creating any actual
    resource as there is already a windowing system provided depth/stencil
    buffer as requested by QSurfaceFormat.
 */

/*!
    \internal
 */
QRhiRenderBuffer::QRhiRenderBuffer(QRhiImplementation *rhi, Type type_, const QSize &pixelSize_,
                                   int sampleCount_, Flags flags_)
    : QRhiResource(rhi),
      m_type(type_), m_pixelSize(pixelSize_), m_sampleCount(sampleCount_), m_flags(flags_)
{
}

/*!
    \fn bool QRhiRenderBuffer::build()

    Creates the corresponding native graphics resources. If there are already
    resources present due to an earlier build() with no corresponding
    release(), then release() is called implicitly first.

    \return \c true when successful, \c false when a graphics operation failed.
    Regardless of the return value, calling release() is always safe.
 */

Laszlo Agocs's avatar
Laszlo Agocs committed
1630 1631 1632
/*!
    \class QRhiTexture
    \inmodule QtRhi
1633
    \brief Texture resource.
Laszlo Agocs's avatar
Laszlo Agocs committed
1634 1635
 */

Laszlo Agocs's avatar
Laszlo Agocs committed
1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711
/*!
    \enum QRhiTexture::Flag

    Flag values to specify how the texture is going to be used. Not honoring
    the flags set before build() and attempting to use the texture in ways that
    was not declared upfront can lead to unspecified behavior or decreased
    performance depending on the backend and the underlying graphics API.

    \value RenderTarget The texture going to be used in combination with
    QRhiTextureRenderTarget

    \value ChangesFrequently Performance hint to indicate that the texture
    contents will change frequently and so staging buffers, if any, are to be
    kept alive to avoid performance hits

    \value CubeMap The texture is a cubemap. Such textures have 6 layers, one
    for each face in the order of +X, -X, +Y, -Y, +Z, -Z. Cubemap textures
    cannot be multisample.

     \value MipMapped The texture has mipmaps. The appropriate mip count is
     calculated automatically and can also be retrieved via
     QRhi::mipLevelsForSize(). The images for the mip levels have to be
     provided in the texture uploaded or generated via
     QRhiResourceUpdateBatch::generateMips(). Multisample textures cannot have
     mipmaps.

    \value sRGB Use an sRGB format

    \value UsedAsTransferSource The texture is used as the source of a texture
    copy or readback, meaning the texture is given as the source in
    QRhiResourceUpdateBatch::copyTexture() or
    QRhiResourceUpdateBatch::readBackTexture().

     \value UsedWithGenerateMips The texture is going to be used with
     QRhiResourceUpdateBatch::generateMips().
 */

/*!
    \enum QRhiTexture::Format

    Specifies the texture format. See also QRhi::isTextureFormatSupported() and
    note that flags() can modify the format when QRhiTexture::sRGB is set.

    \value UnknownFormat Not a valid format. This cannot be passed to setFormat().
    \value RGBA8
    \value BGRA8
    \value R8
    \value R16
    \value D16
    \value D32
    \value BC1
    \value BC2
    \value BC3
    \value BC4
    \value BC5
    \value BC6H
    \value BC7
    \value ETC2_RGB8
    \value ETC2_RGB8A1
    \value ETC2_RGBA8
    \value ASTC_4x4
    \value ASTC_5x4
    \value ASTC_5x5
    \value ASTC_6x5
    \value ASTC_6x6
    \value ASTC_8x5
    \value ASTC_8x6
    \value ASTC_8x8
    \value ASTC_10x5
    \value ASTC_10x6
    \value ASTC_10x8
    \value ASTC_10x10
    \value ASTC_12x10
    \value ASTC_12x12
 */

Laszlo Agocs's avatar
Laszlo Agocs committed
1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774
/*!
    \internal
 */
QRhiTexture::QRhiTexture(QRhiImplementation *rhi, Format format_, const QSize &pixelSize_,
                         int sampleCount_, Flags flags_)
    : QRhiResource(rhi),
      m_format(format_), m_pixelSize(pixelSize_), m_sampleCount(sampleCount_), m_flags(flags_)
{
}

/*!
    \fn bool QRhiTexture::build()

    Creates the corresponding native graphics resources. If there are already
    resources present due to an earlier build() with no corresponding
    release(), then release() is called implicitly first.

    \return \c true when successful, \c false when a graphics operation failed.
    Regardless of the return value, calling release() is always safe.
 */

/*!
    \return a pointer to a backend-specific QRhiNativeHandles subclass, such as
    QRhiVulkanTextureNativeHandles. The returned value is null when exposing
    the underlying native resources is not supported by the backend.

    \sa QRhiVulkanTextureNativeHandles, QRhiD3D11TextureNativeHandles,
    QRhiMetalTextureNativeHandles, QRhiGles2TextureNativeHandles
 */
const QRhiNativeHandles *QRhiTexture::nativeHandles()
{
    return nullptr;
}

/*!
    Similar to build() except that no new native textures are created. Instead,
    the texture from \a src is used.

    This allows importing an existing native texture object (which must belong
    to the same device or sharing context, depending on the graphics API) from
    an external graphics engine.

    \note format(), pixelSize(), sampleCount(), and flags() must still be set
    correctly. Passing incorrect sizes and other values to QRhi::newTexture()
    and then following it with a buildFrom() expecting that the native texture
    object alone is sufficient to deduce such values is \b wrong and will lead
    to problems.

    \note QRhiTexture does not take ownership of the texture object. release()
    does not free the object or any associated memory.

    The opposite of this operation, exposing a QRhiTexture-created native
    texture object to a foreign engine, is possible via nativeHandles().

    \sa QRhiVulkanTextureNativeHandles, QRhiD3D11TextureNativeHandles,
    QRhiMetalTextureNativeHandles, QRhiGles2TextureNativeHandles
 */
bool QRhiTexture::buildFrom(const QRhiNativeHandles *src)
{
    Q_UNUSED(src);
    return false;
}

Laszlo Agocs's avatar
Laszlo Agocs committed
1775 1776 1777
/*!
    \class QRhiSampler
    \inmodule QtRhi
1778
    \brief Sampler resource.
Laszlo Agocs's avatar
Laszlo Agocs committed
1779 1780
 */

Laszlo Agocs's avatar
Laszlo Agocs committed
1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800
/*!
    \enum QRhiSampler::Filter
    Specifies the minification, magnification, or mipmap filtering

    \value None Applicable only for mipmapMode(), indicates no mipmaps to be used
    \value Nearest
    \value Linear
 */

/*!
    \enum QRhiSampler::AddressMode
    Specifies the addressing mode

    \value Repeat
    \value ClampToEdge
    \value Border
    \value Mirror
    \value MirrorOnce
 */

Laszlo Agocs's avatar
Laszlo Agocs committed
1801
/*!
Laszlo Agocs's avatar
Laszlo Agocs committed
1802 1803 1804 1805 1806 1807 1808 1809 1810 1811
    \internal
 */
QRhiSampler::QRhiSampler(QRhiImplementation *rhi,
                         Filter magFilter_, Filter minFilter_, Filter mipmapMode_,
                         AddressMode u_, AddressMode v_, AddressMode w_)
    : QRhiResource(rhi),
      m_magFilter(magFilter_), m_minFilter(minFilter_), m_mipmapMode(mipmapMode_),
      m_addressU(u_), m_addressV(v_), m_addressW(w_)
{
}
1812

Laszlo Agocs's avatar
Laszlo Agocs committed
1813 1814 1815 1816
/*!
    \class QRhiRenderPassDescriptor
    \inmodule QtRhi
    \brief Render pass resource.
Laszlo Agocs's avatar
Laszlo Agocs committed
1817 1818
 */

Laszlo Agocs's avatar
Laszlo Agocs committed
1819
/*!
Laszlo Agocs's avatar
Laszlo Agocs committed
1820
    \internal
Laszlo Agocs's avatar
Laszlo Agocs committed
1821
 */
Laszlo Agocs's avatar
Laszlo Agocs committed
1822 1823 1824 1825
QRhiRenderPassDescriptor::QRhiRenderPassDescriptor(QRhiImplementation *rhi)
    : QRhiResource(rhi)
{
}
Laszlo Agocs's avatar
Laszlo Agocs committed
1826 1827 1828 1829

/*!
    \class QRhiRenderTarget
    \inmodule QtRhi
1830
    \brief Represents an onscreen (swapchain) or offscreen (texture) render target.
Laszlo Agocs's avatar
Laszlo Agocs committed
1831 1832
 */

Laszlo Agocs's avatar
Laszlo Agocs committed
1833 1834 1835 1836 1837 1838 1839 1840 1841 1842
/*!
    \enum QRhiRenderTarget::Type
    Specifies the type of the render target

    \value RtRef This is a reference to another resource's buffer(s). Used by
    targets returned from QRhiSwapChain::currentFrameRenderTarget().

    \value RtTexture This is a QRhiTextureRenderTarget.
 */

Laszlo Agocs's avatar
Laszlo Agocs committed
1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879
/*!
    \internal
 */
QRhiRenderTarget::QRhiRenderTarget(QRhiImplementation *rhi)
    : QRhiResource(rhi)
{
}

/*!
    \fn QRhiRenderTarget::Type QRhiRenderTarget::type() const

    \return the type of the render target.
 */

/*!
    \fn QSize QRhiRenderTarget::sizeInPixels() const

    \return the size in pixels.
 */

/*!
    \fn float QRhiRenderTarget::devicePixelRatio() const

    \return the device pixel ratio. For QRhiTextureRenderTarget this is always
    1. For targets retrieved from a QRhiSwapChain the value reflects the
    \l{QWindow::devicePixelRatio()}{device pixel ratio} of the targeted
    QWindow.
 */

/*!
    \internal
 */
QRhiReferenceRenderTarget::QRhiReferenceRenderTarget(QRhiImplementation *rhi)
    : QRhiRenderTarget(rhi)
{
}

Laszlo Agocs's avatar
Laszlo Agocs committed
1880 1881 1882
/*!
    \class QRhiTextureRenderTarget
    \inmodule QtRhi
1883
    \brief Texture render target resource.
1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902

    A texture render target allows rendering into one or more textures,
    optionally with a depth texture or depth/stencil renderbuffer.

    \note Textures used in combination with QRhiTextureRenderTarget must be
    created with the QRhiTexture::RenderTarget flag.

    The simplest example of creating a render target with a texture as its
    single color attachment:

    \badcode
        texture = rhi->newTexture(QRhiTexture::RGBA8, size, 1, QRhiTexture::RenderTarget);
        texture->build();
        rt = rhi->newTextureRenderTarget({ texture });
        rp = rt->newCompatibleRenderPassDescriptor();
        rt->setRenderPassDescriptor(rt);
        rt->build();
        // rt can now be used with beginPass()
    \endcode
Laszlo Agocs's avatar
Laszlo Agocs committed
1903 1904
 */

Laszlo Agocs's avatar
Laszlo Agocs committed
1905 1906
/*!
    \enum QRhiTextureRenderTarget::Flag
1907 1908 1909 1910 1911 1912

    Flag values describing the load/store behavior for the render target. The
    load/store behavior may be baked into native resources under the hood,
    depending on the backend, and therefore it needs to be known upfront and
    cannot be changed without rebuilding (and so releasing and creating new
    native resources).
Laszlo Agocs's avatar
Laszlo Agocs committed
1913 1914 1915 1916 1917 1918 1919 1920 1921

    \value PreserveColorContents Indicates that the contents of the color
    attachments is to be loaded when starting a render pass, instead of
    clearing. This is potentially more expensive, especially on mobile (tiled)
    GPUs, but allows preserving the existing contents between passes.

    \value PreserveDepthStencilContents Indicates that the contents of the
    depth texture is to be loaded when starting a render pass, instead
    clearing. Only applicable when a texture is used as the depth buffer
Laszlo Agocs's avatar
Laszlo Agocs committed
1922
    (QRhiTextureRenderTargetDescription::depthTexture() is set) because
Laszlo Agocs's avatar
Laszlo Agocs committed
1923 1924 1925 1926
    depth/stencil renderbuffers may not have any physical backing and data may
    not be written out in the first place.
 */

Laszlo Agocs's avatar
Laszlo Agocs committed
1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988
/*!
    \internal
 */
QRhiTextureRenderTarget::QRhiTextureRenderTarget(QRhiImplementation *rhi,
                                                 const QRhiTextureRenderTargetDescription &desc_,
                                                 Flags flags_)
    : QRhiRenderTarget(rhi),
      m_desc(desc_),
      m_flags(flags_)
{
}

/*!
    \fn QRhiRenderPassDescriptor *QRhiTextureRenderTarget::newCompatibleRenderPassDescriptor()

    \return a new QRhiRenderPassDescriptor that is compatible with this render
    target.

    The returned value is used in two ways: it can be passed to
    setRenderPassDescriptor() and
    QRhiGraphicsPipeline::setRenderPassDescriptor(). A render pass descriptor
    describes the attachments (color, depth/stencil) and the load/store
    behavior that can be affected by flags(). A QRhiGraphicsPipeline can only
    be used in combination with a render target that has the same
    QRhiRenderPassDescriptor set.

    Two QRhiTextureRenderTarget instances can share the same render pass
    descriptor as long as they have the same number and type of attachments.
    The associated QRhiTexture or QRhiRenderBuffer instances are not part of
    the render pass descriptor so those can differ in the two
    QRhiTextureRenderTarget intances.

    \note resources, such as QRhiTexture instances, referenced in description()
    must already be built

    \sa build()
 */

/*!
    \fn bool QRhiTextureRenderTarget::build()

    Creates the corresponding native graphics resources. If there are already
    resources present due to an earlier build() with no corresponding
    release(), then release() is called implicitly first.

    \note renderPassDescriptor() must be set before calling build(). To obtain
    a QRhiRenderPassDescriptor compatible with the render target, call
    newCompatibleRenderPassDescriptor() before build() but after setting all
    other parameters, such as description() and flags(). To save resources,
    reuse the same QRhiRenderPassDescriptor with multiple
    QRhiTextureRenderTarget instances, whenever possible. Sharing the same
    render pass descriptor is only possible when the render targets have the
    same number and type of attachments (the actual textures can differ) and
    the same flags.

    \note resources, such as QRhiTexture instances, referenced in description()
    must already be built

    \return \c true when successful, \c false when a graphics operation failed.
    Regardless of the return value, calling release() is always safe.
 */

Laszlo Agocs's avatar
Laszlo Agocs committed
1989 1990 1991
/*!
    \class QRhiShaderResourceBindings
    \inmodule QtRhi
1992
    \brief Encapsulates resources for making buffer, texture, sampler resources visible to shaders.
Laszlo Agocs's avatar
Laszlo Agocs committed
1993 1994

    A QRhiShaderResourceBindings is a collection of QRhiShaderResourceBinding
1995
    objects, each of which describe a single binding.
Laszlo Agocs's avatar