qrhi.h 38.6 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 38 39 40 41 42 43 44 45 46 47
/****************************************************************************
**
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QRHI_H
#define QRHI_H

#include <QtRhi/qtrhiglobal.h>
#include <QVector4D>
#include <QVector2D>
#include <QSize>
#include <QMatrix4x4>
#include <QVector>
#include <QImage>
#include <QtShaderTools/QBakedShader>
48
#include <functional>
49 50 51 52

QT_BEGIN_NAMESPACE

class QWindow;
Laszlo Agocs's avatar
Laszlo Agocs committed
53 54 55 56 57 58
class QRhiImplementation;
class QRhiBuffer;
class QRhiRenderBuffer;
class QRhiTexture;
class QRhiSampler;
struct QRhiResourceUpdateBatchPrivate;
59

60 61 62 63 64 65 66 67
// C++ object ownership rules:
//   1. new*() and create() return value owned by the caller.
//   2. next*() return value not owned by the caller.
//   3. Passing a pointer via set*() or the structs does not transfer ownership.
//   4. release() does not destroy the C++ object. releaseAndDestroy() does, and is equivalent to o->release(); delete o;
//
// Graphics resource ownership rules:
//   1. new*() does not create underlying graphics resources. build() does.
68 69 70
//   2. Except: new*Descriptor() implicitly "builds". (no build() for QRhiRenderPassDescriptor f.ex.)
//   3. release() schedules graphics resources for destruction. The C++ object is reusable immediately via build(), or can be destroyed.
//   4. build() on an already built object calls release() implicitly. Except swapchains. (buildOrResize - special semantics)
71 72 73 74 75
//   5. Ownership of resources imported via QRhi*InitParams is not taken.
//
// Other:
//   1. QRhiResourceUpdateBatch manages no graphics resources underneath. beginPass() implicitly calls release() on the batch.

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
struct Q_RHI_EXPORT QRhiColorClearValue
{
    QRhiColorClearValue() : rgba(0, 0, 0, 1) { }
    explicit QRhiColorClearValue(const QVector4D &rgba_) : rgba(rgba_) { }
    QRhiColorClearValue(float r, float g, float b, float a) : rgba(r, g, b, a) { }
    QVector4D rgba;
};

Q_DECLARE_TYPEINFO(QRhiColorClearValue, Q_MOVABLE_TYPE);

struct Q_RHI_EXPORT QRhiDepthStencilClearValue
{
    QRhiDepthStencilClearValue() : d(1), s(0) { }
    QRhiDepthStencilClearValue(float d_, quint32 s_) : d(d_), s(s_) { }
    float d;
    quint32 s;
};

Q_DECLARE_TYPEINFO(QRhiDepthStencilClearValue, Q_MOVABLE_TYPE);

struct Q_RHI_EXPORT QRhiViewport
{
    QRhiViewport() { }
    // x,y is bottom-left, like in OpenGL, regardless of what isYUpInFramebuffer() says
    QRhiViewport(float x, float y, float w, float h, float minDepth_ = 0.0f, float maxDepth_ = 1.0f)
        : r(x, y, w, h), minDepth(minDepth_), maxDepth(maxDepth_)
    { }
    QVector4D r;
    float minDepth;
    float maxDepth;
};

Q_DECLARE_TYPEINFO(QRhiViewport, Q_MOVABLE_TYPE);

struct Q_RHI_EXPORT QRhiScissor
{
    QRhiScissor() { }
    // x,y is bottom-left, like in OpenGL, regardless of what isYUpInFramebuffer() says
    QRhiScissor(int x, int y, int w, int h)
        : r(x, y, w, h)
    { }
    QVector4D r;
};

Q_DECLARE_TYPEINFO(QRhiScissor, Q_MOVABLE_TYPE);

struct Q_RHI_EXPORT QRhiVertexInputLayout
{
    struct Q_RHI_EXPORT Binding {
        enum Classification {
            PerVertex,
            PerInstance
        };
        Binding() { }
130 131
        Binding(quint32 stride_, Classification cls = PerVertex, int stepRate = 1)
            : stride(stride_), classification(cls), instanceStepRate(stepRate)
132
        { }
Laszlo Agocs's avatar
Laszlo Agocs committed
133
        quint32 stride; // must be a multiple of 4
134
        Classification classification;
135
        int instanceStepRate;
136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174
    };

    struct Q_RHI_EXPORT Attribute {
        enum Format {
            Float4,
            Float3,
            Float2,
            Float,
            UNormByte4,
            UNormByte2,
            UNormByte
        };
        Attribute() { }
        Attribute(int binding_, int location_, Format format_, quint32 offset_)
            : binding(binding_), location(location_), format(format_), offset(offset_)
        { }
        int binding;
        // With HLSL we assume the vertex shader uses TEXCOORD<location> as the
        // semantic for each input. Hence no separate semantic name and index.
        int location;
        Format format;
        quint32 offset;
    };

    QVector<Binding> bindings; // slots
    QVector<Attribute> attributes;
};

Q_DECLARE_TYPEINFO(QRhiVertexInputLayout::Binding, Q_MOVABLE_TYPE);
Q_DECLARE_TYPEINFO(QRhiVertexInputLayout::Attribute, Q_MOVABLE_TYPE);
Q_DECLARE_TYPEINFO(QRhiVertexInputLayout, Q_MOVABLE_TYPE);

struct Q_RHI_EXPORT QRhiGraphicsShaderStage
{
    enum Type {
        Vertex,
        Fragment,
        TessellationControl, // Hull
        TessellationEvaluation // Domain
175
        // yes, no geometry shaders (Metal does not have them)
176 177 178 179 180 181 182 183 184 185 186 187 188
    };

    QRhiGraphicsShaderStage() { }
    QRhiGraphicsShaderStage(Type type_, const QBakedShader &shader_)
        : type(type_), shader(shader_)
    { }

    Type type;
    QBakedShader shader;
};

Q_DECLARE_TYPEINFO(QRhiGraphicsShaderStage, Q_MOVABLE_TYPE);

Laszlo Agocs's avatar
Laszlo Agocs committed
189 190 191 192 193 194 195 196 197 198
struct Q_RHI_EXPORT QRhiShaderResourceBinding
{
    enum Type {
        UniformBuffer,
        SampledTexture
    };

    enum StageFlag {
        VertexStage = 1 << 0,
        FragmentStage = 1 << 1,
199 200
        TessellationControlStage = 1 << 2,
        TessellationEvaluationStage = 1 << 3
Laszlo Agocs's avatar
Laszlo Agocs committed
201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264
    };
    Q_DECLARE_FLAGS(StageFlags, StageFlag)

    static QRhiShaderResourceBinding uniformBuffer(int binding_, StageFlags stage_, QRhiBuffer *buf_);

    // Bind a region only. Up to the user to ensure offset is aligned to ubufAlignment.
    static QRhiShaderResourceBinding uniformBuffer(int binding_, StageFlags stage_, QRhiBuffer *buf_, int offset_, int size_);

    static QRhiShaderResourceBinding sampledTexture(int binding_, StageFlags stage_, QRhiTexture *tex_, QRhiSampler *sampler_);

    int binding;
    StageFlags stage;
    Type type;
    struct UniformBufferData {
        QRhiBuffer *buf;
        int offset;
        int maybeSize;
    };
    struct SampledTextureData {
        QRhiTexture *tex;
        QRhiSampler *sampler;
    };
    union {
        UniformBufferData ubuf;
        SampledTextureData stex;
    };
};

Q_DECLARE_OPERATORS_FOR_FLAGS(QRhiShaderResourceBinding::StageFlags)
Q_DECLARE_TYPEINFO(QRhiShaderResourceBinding, Q_MOVABLE_TYPE);

struct Q_RHI_EXPORT QRhiTextureRenderTargetDescription
{
    struct Q_RHI_EXPORT ColorAttachment {
        ColorAttachment() { }
        ColorAttachment(QRhiTexture *texture_) : texture(texture_) { }
        QRhiTexture *texture = nullptr;
        int layer = 0; // face (0..5) for cubemaps
    };

    QRhiTextureRenderTargetDescription()
    { }
    QRhiTextureRenderTargetDescription(const ColorAttachment &colorAttachment)
    { colorAttachments.append(colorAttachment); }
    QRhiTextureRenderTargetDescription(const ColorAttachment &colorAttachment, QRhiRenderBuffer *depthStencilBuffer_)
        : depthStencilBuffer(depthStencilBuffer_)
    { colorAttachments.append(colorAttachment); }
    QRhiTextureRenderTargetDescription(const ColorAttachment &colorAttachment, QRhiTexture *depthTexture_)
        : depthTexture(depthTexture_)
    { colorAttachments.append(colorAttachment); }

    QVector<ColorAttachment> colorAttachments;
    QRhiRenderBuffer *depthStencilBuffer = nullptr;
    QRhiTexture *depthTexture = nullptr;
};

Q_DECLARE_TYPEINFO(QRhiTextureRenderTargetDescription::ColorAttachment, Q_MOVABLE_TYPE);
Q_DECLARE_TYPEINFO(QRhiTextureRenderTargetDescription, Q_MOVABLE_TYPE);

struct Q_RHI_EXPORT QRhiTextureUploadDescription
{
    struct Q_RHI_EXPORT Layer {
        struct Q_RHI_EXPORT MipLevel {
            MipLevel() { }
265
            // either a QImage or compressed data (not both)
Laszlo Agocs's avatar
Laszlo Agocs committed
266
            MipLevel(const QImage &image_) : image(image_) { }
267
            MipLevel(const QByteArray &compressedData_) : compressedData(compressedData_) { }
Laszlo Agocs's avatar
Laszlo Agocs committed
268
            QImage image;
269
            QByteArray compressedData;
Laszlo Agocs's avatar
Laszlo Agocs committed
270 271 272 273 274 275 276 277 278 279 280 281 282 283
        };
        Layer() { }
        Layer(const QVector<MipLevel> &mipImages_) : mipImages(mipImages_) { }
        QVector<MipLevel> mipImages;
    };
    QRhiTextureUploadDescription() { }
    QRhiTextureUploadDescription(const QVector<Layer> &layers_) : layers(layers_) { }
    QVector<Layer> layers; // 6 layers for cubemaps, 1 otherwise
};

Q_DECLARE_TYPEINFO(QRhiTextureUploadDescription::Layer::MipLevel, Q_MOVABLE_TYPE);
Q_DECLARE_TYPEINFO(QRhiTextureUploadDescription::Layer, Q_MOVABLE_TYPE);
Q_DECLARE_TYPEINFO(QRhiTextureUploadDescription, Q_MOVABLE_TYPE);

284
struct Q_RHI_EXPORT QRhiReadbackDescription
Laszlo Agocs's avatar
Laszlo Agocs committed
285
{
286 287
    QRhiReadbackDescription() { } // source is the current back buffer (if swapchain supports readback)
    QRhiReadbackDescription(QRhiTexture *texture_) : texture(texture_) { } // source is the specified texture
288 289 290
    QRhiTexture *texture = nullptr;
    int layer = 0;
    int level = 0;
Laszlo Agocs's avatar
Laszlo Agocs committed
291 292
};

293 294
Q_DECLARE_TYPEINFO(QRhiReadbackDescription, Q_MOVABLE_TYPE);

295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323
class Q_RHI_EXPORT QRhiResource
{
public:
    virtual ~QRhiResource();
    virtual void release() = 0;
    void releaseAndDestroy();

protected:
    QRhiImplementation *rhi = nullptr;
    QRhiResource(QRhiImplementation *rhi_);
    Q_DISABLE_COPY(QRhiResource)
};

class Q_RHI_EXPORT QRhiBuffer : public QRhiResource
{
public:
    enum Type {
        Immutable, // data never changes after initial upload - under the hood typically in device local (GPU) memory
        Static,    // data changes infrequently - under the hood typically device local and updated via a separate, host visible staging buffer
        Dynamic    // data changes frequently - under the hood typically host visible
    };

    enum UsageFlag {
        VertexBuffer = 1 << 0,
        IndexBuffer = 1 << 1,
        UniformBuffer = 1 << 2
    };
    Q_DECLARE_FLAGS(UsageFlags, UsageFlag)

Laszlo Agocs's avatar
Laszlo Agocs committed
324 325 326 327 328 329
    Type type() const { return m_type; }
    void setType(Type t) { m_type = t; }

    UsageFlags usage() const { return m_usage; }
    void setUsage(UsageFlags u) { m_usage = u; }

330 331
    // no restrictions here, up to the backend to round up if needed (that
    // won't be visible in the user-provided size reported here)
Laszlo Agocs's avatar
Laszlo Agocs committed
332 333
    int size() const { return m_size; }
    void setSize(int sz) { m_size = sz; }
334 335 336 337 338

    virtual bool build() = 0;

protected:
    QRhiBuffer(QRhiImplementation *rhi, Type type_, UsageFlags usage_, int size_);
Laszlo Agocs's avatar
Laszlo Agocs committed
339 340
    Type m_type;
    UsageFlags m_usage;
341
    int m_size;
Laszlo Agocs's avatar
Laszlo Agocs committed
342
    void *m_reserved;
343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358
};

Q_DECLARE_OPERATORS_FOR_FLAGS(QRhiBuffer::UsageFlags)

class Q_RHI_EXPORT QRhiRenderBuffer : public QRhiResource
{
public:
    enum Type {
        DepthStencil
    };

    enum Hint {
        ToBeUsedWithSwapChainOnly = 1 << 0 // use implicit winsys buffers, don't create anything (GL)
    };
    Q_DECLARE_FLAGS(Hints, Hint)

Laszlo Agocs's avatar
Laszlo Agocs committed
359 360 361 362 363 364 365 366 367 368 369
    Type type() const { return m_type; }
    void setType(Type t) { m_type = t; }

    QSize pixelSize() const { return m_pixelSize; }
    void setPixelSize(const QSize &sz) { m_pixelSize = sz; }

    int sampleCount() const { return m_sampleCount; }
    void setSampleCount(int s) { m_sampleCount = s; }

    Hints hints() const { return m_hints; }
    void setHints(Hints h) { m_hints = h; }
370 371 372 373 374 375

    virtual bool build() = 0;

protected:
    QRhiRenderBuffer(QRhiImplementation *rhi, Type type_, const QSize &pixelSize_,
                     int sampleCount_, Hints hints_);
Laszlo Agocs's avatar
Laszlo Agocs committed
376 377 378 379 380
    Type m_type;
    QSize m_pixelSize;
    int m_sampleCount;
    Hints m_hints;
    void *m_reserved;
381 382 383 384 385 386 387 388 389
};

Q_DECLARE_OPERATORS_FOR_FLAGS(QRhiRenderBuffer::Hints)

class Q_RHI_EXPORT QRhiTexture : public QRhiResource
{
public:
    enum Flag {
        RenderTarget = 1 << 0,
390
        ChangesFrequently = 1 << 1, // hint for backend to keep staging resources around
391
        CubeMap = 1 << 2,
392
        MipMapped = 1 << 3,
393 394
        sRGB = 1 << 4,
        ReadBack = 1 << 5
395 396 397 398
    };
    Q_DECLARE_FLAGS(Flags, Flag)

    enum Format {
399 400
        UnknownFormat,

401 402 403 404 405 406
        RGBA8,
        BGRA8,
        R8,
        R16,

        D16,
407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434
        D32,

        BC1,
        BC2,
        BC3,
        BC4,
        BC5,
        BC6H,
        BC7,

        ETC2_RGB8,
        ETC2_RGB8A1,
        ETC2_RGBA8,

        ASTC_4x4,
        ASTC_5x4,
        ASTC_5x5,
        ASTC_6x5,
        ASTC_6x6,
        ASTC_8x5,
        ASTC_8x6,
        ASTC_8x8,
        ASTC_10x5,
        ASTC_10x6,
        ASTC_10x8,
        ASTC_10x10,
        ASTC_12x10,
        ASTC_12x12
435 436
    };

Laszlo Agocs's avatar
Laszlo Agocs committed
437 438 439 440 441 442 443 444
    Format format() const { return m_format; }
    void setFormat(Format fmt) { m_format = fmt; }

    QSize pixelSize() const { return m_pixelSize; }
    void setPixelSize(const QSize &sz) { m_pixelSize = sz; }

    Flags flags() const { return m_flags; }
    void setFlags(Flags f) { m_flags = f; }
445 446 447 448 449

    virtual bool build() = 0;

protected:
    QRhiTexture(QRhiImplementation *rhi, Format format_, const QSize &pixelSize_, Flags flags_);
Laszlo Agocs's avatar
Laszlo Agocs committed
450 451 452 453
    Format m_format;
    QSize m_pixelSize;
    Flags m_flags;
    void *m_reserved;
454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474
};

Q_DECLARE_OPERATORS_FOR_FLAGS(QRhiTexture::Flags)

class Q_RHI_EXPORT QRhiSampler : public QRhiResource
{
public:
    enum Filter {
        None, // for mipmapMode only
        Nearest,
        Linear
    };

    enum AddressMode {
        Repeat,
        ClampToEdge,
        Border,
        Mirror,
        MirrorOnce
    };

Laszlo Agocs's avatar
Laszlo Agocs committed
475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491
    Filter magFilter() const { return m_magFilter; }
    void setMagFilter(Filter f) { m_magFilter = f; }

    Filter minFilter() const { return m_minFilter; }
    void setMinFilter(Filter f) { m_minFilter = f; }

    Filter mipmapMode() const { return m_mipmapMode; }
    void setMipmapMode(Filter f) { m_mipmapMode = f; }

    AddressMode addressU() const { return m_addressU; }
    void setAddressU(AddressMode mode) { m_addressU = mode; }

    AddressMode addressV() const { return m_addressV; }
    void setAddressV(AddressMode mode) { m_addressV = mode; }

    AddressMode addressW() const { return m_addressW; }
    void setAddressW(AddressMode mode) { m_addressW = mode; }
492 493 494 495 496 497 498

    virtual bool build() = 0;

protected:
    QRhiSampler(QRhiImplementation *rhi,
                Filter magFilter_, Filter minFilter_, Filter mipmapMode_,
                AddressMode u_, AddressMode v_, AddressMode w_);
Laszlo Agocs's avatar
Laszlo Agocs committed
499 500 501 502 503 504 505
    Filter m_magFilter;
    Filter m_minFilter;
    Filter m_mipmapMode;
    AddressMode m_addressU;
    AddressMode m_addressV;
    AddressMode m_addressW;
    void *m_reserved;
506 507
};

508
class Q_RHI_EXPORT QRhiRenderPassDescriptor : public QRhiResource
509 510
{
protected:
511
    QRhiRenderPassDescriptor(QRhiImplementation *rhi);
Laszlo Agocs's avatar
Laszlo Agocs committed
512
    void *m_reserved;
513 514 515 516 517 518 519 520 521 522 523 524
};

class Q_RHI_EXPORT QRhiRenderTarget : public QRhiResource
{
public:
    enum Type {
        RtRef,
        RtTexture
    };

    virtual Type type() const = 0;
    virtual QSize sizeInPixels() const = 0;
Laszlo Agocs's avatar
Laszlo Agocs committed
525

526 527
    QRhiRenderPassDescriptor *renderPassDescriptor() const { return m_renderPassDesc; }
    void setRenderPassDescriptor(QRhiRenderPassDescriptor *desc) { m_renderPassDesc = desc; }
528 529 530

protected:
    QRhiRenderTarget(QRhiImplementation *rhi);
531
    QRhiRenderPassDescriptor *m_renderPassDesc = nullptr;
Laszlo Agocs's avatar
Laszlo Agocs committed
532
    void *m_reserved;
533 534 535 536 537 538 539 540 541 542
};

class Q_RHI_EXPORT QRhiTextureRenderTarget : public QRhiRenderTarget
{
public:
    enum Flag {
        PreserveColorContents = 1 << 0
    };
    Q_DECLARE_FLAGS(Flags, Flag)

Laszlo Agocs's avatar
Laszlo Agocs committed
543 544
    QRhiTextureRenderTargetDescription description() const { return m_desc; }
    void setDescription(const QRhiTextureRenderTargetDescription &desc) { m_desc = desc; }
545

Laszlo Agocs's avatar
Laszlo Agocs committed
546 547 548
    Flags flags() const { return m_flags; }
    void setFlags(Flags f) { m_flags = f; }

Laszlo Agocs's avatar
Laszlo Agocs committed
549
    // To be called before build() with description and flags set.
550 551
    // Textures in desc must already be built.
    // Note setRenderPassDescriptor() in the base class, that must still be called afterwards (but before build()).
552
    virtual QRhiRenderPassDescriptor *newCompatibleRenderPassDescriptor() = 0;
Laszlo Agocs's avatar
Laszlo Agocs committed
553

Laszlo Agocs's avatar
Laszlo Agocs committed
554
    // as usual, textures in desc must be built before calling build() on the rt
555 556 557 558
    virtual bool build() = 0;

protected:
    QRhiTextureRenderTarget(QRhiImplementation *rhi, const QRhiTextureRenderTargetDescription &desc_, Flags flags_);
Laszlo Agocs's avatar
Laszlo Agocs committed
559 560
    QRhiTextureRenderTargetDescription m_desc;
    Flags m_flags;
561 562 563 564 565 566 567
};

Q_DECLARE_OPERATORS_FOR_FLAGS(QRhiTextureRenderTarget::Flags)

class Q_RHI_EXPORT QRhiShaderResourceBindings : public QRhiResource
{
public:
Laszlo Agocs's avatar
Laszlo Agocs committed
568 569
    QVector<QRhiShaderResourceBinding> bindings() const { return m_bindings; }
    void setBindings(const QVector<QRhiShaderResourceBinding> &b) { m_bindings = b; }
570 571 572 573 574

    virtual bool build() = 0;

protected:
    QRhiShaderResourceBindings(QRhiImplementation *rhi);
Laszlo Agocs's avatar
Laszlo Agocs committed
575 576
    QVector<QRhiShaderResourceBinding> m_bindings;
    void *m_reserved;
577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685
};

class Q_RHI_EXPORT QRhiGraphicsPipeline : public QRhiResource
{
public:
    enum Flag {
        UsesBlendConstants = 1 << 0,
        UsesStencilRef = 1 << 1,
        UsesScissor = 1 << 2
    };
    Q_DECLARE_FLAGS(Flags, Flag)

    enum Topology {
        Triangles,
        TriangleStrip,
        Lines,
        LineStrip,
        Points
    };

    enum CullMode { // not a bitmask since some apis use a mask, some don't
        None,
        Front,
        Back
    };

    enum FrontFace {
        CCW,
        CW
    };

    enum ColorMaskComponent {
        R = 1 << 0,
        G = 1 << 1,
        B = 1 << 2,
        A = 1 << 3
    };
    Q_DECLARE_FLAGS(ColorMask, ColorMaskComponent)

    enum BlendFactor {
        Zero,
        One,
        SrcColor,
        OneMinusSrcColor,
        DstColor,
        OneMinusDstColor,
        SrcAlpha,
        OneMinusSrcAlpha,
        DstAlpha,
        OneMinusDstAlpha,
        ConstantColor,
        OneMinusConstantColor,
        ConstantAlpha,
        OneMinusConstantAlpha,
        SrcAlphaSaturate,
        Src1Color,
        OneMinusSrc1Color,
        Src1Alpha,
        OneMinusSrc1Alpha
    };

    enum BlendOp {
        Add,
        Subtract,
        ReverseSubtract,
        Min,
        Max
    };

    struct TargetBlend {
        ColorMask colorWrite = ColorMask(0xF); // R | G | B | A
        bool enable = false;
        BlendFactor srcColor = One;
        BlendFactor dstColor = OneMinusSrcAlpha;
        BlendOp opColor = Add;
        BlendFactor srcAlpha = One;
        BlendFactor dstAlpha = OneMinusSrcAlpha;
        BlendOp opAlpha = Add;
    };

    enum CompareOp {
        Never,
        Less,
        Equal,
        LessOrEqual,
        Greater,
        NotEqual,
        GreaterOrEqual,
        Always
    };

    enum StencilOp {
        StencilZero,
        Keep,
        Replace,
        IncrementAndClamp,
        DecrementAndClamp,
        Invert,
        IncrementAndWrap,
        DecrementAndWrap
    };

    struct StencilOpState {
        StencilOp failOp = Keep;
        StencilOp depthFailOp = Keep;
        StencilOp passOp = Keep;
        CompareOp compareOp = Always;
    };

Laszlo Agocs's avatar
Laszlo Agocs committed
686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736
    Flags flags() const { return m_flags; }
    void setFlags(Flags f) { m_flags = f; }

    Topology topology() const { return m_topology; }
    void setTopology(Topology t) { m_topology = t; }

    CullMode cullMode() const { return m_cullMode; }
    void setCullMode(CullMode mode) { m_cullMode = mode; }

    FrontFace frontFace() const { return m_frontFace; }
    void setFrontFace(FrontFace f) { m_frontFace = f; }

    QVector<TargetBlend> targetBlends() const { return m_targetBlends; }
    void setTargetBlends(const QVector<TargetBlend> &blends) { m_targetBlends = blends; }

    bool hasDepthTest() const { return m_depthTest; }
    void setDepthTest(bool enable) { m_depthTest = enable; }

    bool hasDepthWrite() const { return m_depthWrite; }
    void setDepthWrite(bool enable) { m_depthWrite = enable; }

    CompareOp depthOp() const { return m_depthOp; }
    void setDepthOp(CompareOp op) { m_depthOp = op; }

    bool hasStencilTest() const { return m_stencilTest; }
    void setStencilTest(bool enable) { m_stencilTest = enable; }

    StencilOpState stencilFront() const { return m_stencilFront; }
    void setStencilFront(const StencilOpState &state) { m_stencilFront = state; }

    StencilOpState stencilBack() const { return m_stencilBack; }
    void setStencilBack(const StencilOpState &state) { m_stencilBack = state; }

    quint32 stencilReadMask() const { return m_stencilReadMask; }
    void setStencilReadMask(quint32 mask) { m_stencilReadMask = mask; }

    quint32 stencilWriteMask() const { return m_stencilWriteMask; }
    void setStencilWriteMask(quint32 mask) { m_stencilWriteMask = mask; }

    int sampleCount() const { return m_sampleCount; }
    void setSampleCount(int s) { m_sampleCount = s; }

    QVector<QRhiGraphicsShaderStage> shaderStages() const { return m_shaderStages; }
    void setShaderStages(const QVector<QRhiGraphicsShaderStage> &stages) { m_shaderStages = stages; }

    QRhiVertexInputLayout vertexInputLayout() const { return m_vertexInputLayout; }
    void setVertexInputLayout(const QRhiVertexInputLayout &layout) { m_vertexInputLayout = layout; }

    QRhiShaderResourceBindings *shaderResourceBindings() const { return m_shaderResourceBindings; }
    void setShaderResourceBindings(QRhiShaderResourceBindings *srb) { m_shaderResourceBindings = srb; }

737 738
    QRhiRenderPassDescriptor *renderPassDescriptor() const { return m_renderPassDesc; }
    void setRenderPassDescriptor(QRhiRenderPassDescriptor *desc) { m_renderPassDesc = desc; }
739 740 741 742 743

    virtual bool build() = 0;

protected:
    QRhiGraphicsPipeline(QRhiImplementation *rhi);
Laszlo Agocs's avatar
Laszlo Agocs committed
744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760
    Flags m_flags;
    Topology m_topology = Triangles;
    CullMode m_cullMode = None;
    FrontFace m_frontFace = CCW;
    QVector<TargetBlend> m_targetBlends; // no blend when empty
    bool m_depthTest = false;
    bool m_depthWrite = false;
    CompareOp m_depthOp = Less;
    bool m_stencilTest = false;
    StencilOpState m_stencilFront;
    StencilOpState m_stencilBack;
    quint32 m_stencilReadMask = 0xFF; // applies to both faces
    quint32 m_stencilWriteMask = 0xFF; // applies to both faces
    int m_sampleCount = 1; // MSAA, swapchain+depthstencil must match
    QVector<QRhiGraphicsShaderStage> m_shaderStages;
    QRhiVertexInputLayout m_vertexInputLayout;
    QRhiShaderResourceBindings *m_shaderResourceBindings = nullptr; // must be built by the time ps' build() is called
761
    QRhiRenderPassDescriptor *m_renderPassDesc = nullptr;
Laszlo Agocs's avatar
Laszlo Agocs committed
762
    void *m_reserved;
763 764 765 766 767 768 769 770 771 772
};

Q_DECLARE_OPERATORS_FOR_FLAGS(QRhiGraphicsPipeline::Flags)
Q_DECLARE_OPERATORS_FOR_FLAGS(QRhiGraphicsPipeline::ColorMask)
Q_DECLARE_TYPEINFO(QRhiGraphicsPipeline::TargetBlend, Q_MOVABLE_TYPE);

class Q_RHI_EXPORT QRhiCommandBuffer : public QRhiResource
{
protected:
    QRhiCommandBuffer(QRhiImplementation *rhi);
Laszlo Agocs's avatar
Laszlo Agocs committed
773
    void *m_reserved;
774 775 776 777 778 779 780
};

class Q_RHI_EXPORT QRhiSwapChain : public QRhiResource
{
public:
    enum SurfaceImportFlag {
        SurfaceHasPreMulAlpha = 1 << 0,
781 782
        SurfaceHasNonPreMulAlpha = 1 << 1,
        sRGB = 1 << 2
783 784 785
    };
    Q_DECLARE_FLAGS(SurfaceImportFlags, SurfaceImportFlag)

Laszlo Agocs's avatar
Laszlo Agocs committed
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800
    QWindow *window() const { return m_window; }
    void setWindow(QWindow *window) { m_window = window; }

    QSize requestedPixelSize() const { return m_requestedPixelSize; }
    void setRequestedPixelSize(const QSize &size) { m_requestedPixelSize = size; }

    SurfaceImportFlags flags() const { return m_flags; }
    void setFlags(SurfaceImportFlags f) { m_flags = f; }

    QRhiRenderBuffer *depthStencil() const { return m_depthStencil; }
    void setDepthStencil(QRhiRenderBuffer *ds) { m_depthStencil = ds; }

    int sampleCount() const { return m_sampleCount; }
    void setSampleCount(int samples) { m_sampleCount = samples; }

801 802
    QRhiRenderPassDescriptor *renderPassDescriptor() const { return m_renderPassDesc; }
    void setRenderPassDescriptor(QRhiRenderPassDescriptor *desc) { m_renderPassDesc = desc; }
Laszlo Agocs's avatar
Laszlo Agocs committed
803

Laszlo Agocs's avatar
Laszlo Agocs committed
804 805 806 807 808
    // Alternatively, integrate with an existing swapchain, f.ex.
    // QVulkanWindow. Other settings have no effect when this is set.
    QObject *target() const { return m_target; }
    void setTarget(QObject *obj) { m_target = obj; }

809 810 811
    virtual QRhiCommandBuffer *currentFrameCommandBuffer() = 0;
    virtual QRhiRenderTarget *currentFrameRenderTarget() = 0;

812 813 814 815 816 817 818 819
    // Applications are expected to use requestedPixelSize() for logic like "if
    // qwindow->size() * qwindow->dpr() != requestedPixelSize() then
    // resize_swapchain", and effectivePixelSize() for all graphics
    // calculations, like the viewport. On some platforms they may not be the
    // same, e.g. some Vulkan implementations on Windows were observed to make
    // the swapchain buffers' height off by one on high dpi screens, this is
    // then reflected in the effective size.
    virtual QSize effectivePixelSize() const = 0;
820

Laszlo Agocs's avatar
Laszlo Agocs committed
821
    // To be called before build() with relevant parameters like depthStencil and sampleCount set.
822 823
    // As an exception to the common rules, m_depthStencil is not required to be built yet.
    // Note setRenderPassDescriptor(), that must still be called afterwards (but before buildOrResize()).
824 825 826 827 828 829 830 831
    virtual QRhiRenderPassDescriptor *newCompatibleRenderPassDescriptor() = 0;

    // As the name suggests, this is slightly different from the typical
    // build+release pattern: buildOrResize - buildOrResize is not the same as
    // buildOrResize - release - buildOrResize. A swapchain is often able to,
    // depending on the underlying APIs, accomodate changed output sizes in a
    // manner that is more efficient than a full destroy - create. So use the
    // former when a window is resized.
Laszlo Agocs's avatar
Laszlo Agocs committed
832
    virtual bool buildOrResize() = 0;
833 834 835

protected:
    QRhiSwapChain(QRhiImplementation *rhi);
Laszlo Agocs's avatar
Laszlo Agocs committed
836 837 838 839 840
    QWindow *m_window = nullptr;
    QSize m_requestedPixelSize;
    SurfaceImportFlags m_flags;
    QRhiRenderBuffer *m_depthStencil = nullptr;
    int m_sampleCount = 1;
841
    QRhiRenderPassDescriptor *m_renderPassDesc = nullptr;
Laszlo Agocs's avatar
Laszlo Agocs committed
842
    QObject *m_target = nullptr;
Laszlo Agocs's avatar
Laszlo Agocs committed
843
    void *m_reserved;
844 845 846 847 848 849 850
};

Q_DECLARE_OPERATORS_FOR_FLAGS(QRhiSwapChain::SurfaceImportFlags)

class Q_RHI_EXPORT QRhiResourceUpdateBatch // sort of a command buffer for copy type of operations
{
public:
851 852 853 854 855 856
    enum TexturePrepareFlag {
        TextureRead = 1 << 0,
        TextureWrite = 1 << 1
    };
    Q_DECLARE_FLAGS(TexturePrepareFlags, TexturePrepareFlag)

857 858 859 860 861 862 863 864
    ~QRhiResourceUpdateBatch();
    // Puts the batch back to the pool without any processing.
    void release();

    // None of these execute anything. Deferred to beginPass. What exactly then
    // happens underneath is hidden from the applications.
    void updateDynamicBuffer(QRhiBuffer *buf, int offset, int size, const void *data);
    void uploadStaticBuffer(QRhiBuffer *buf, const void *data);
Laszlo Agocs's avatar
Laszlo Agocs committed
865
    void uploadTexture(QRhiTexture *tex, const QRhiTextureUploadDescription &desc);
866
    void uploadTexture(QRhiTexture *tex, const QImage &image); // shortcut
867

868 869 870 871
    // This is not normally needed, textures that have an upload or are used
    // with a TextureRenderTarget will be fine without it. May be more relevant later.
    void prepareTextureForUse(QRhiTexture *tex, TexturePrepareFlags flags);

872 873 874 875 876 877 878 879
private:
    QRhiResourceUpdateBatch(QRhiImplementation *rhi);
    Q_DISABLE_COPY(QRhiResourceUpdateBatch)
    QRhiResourceUpdateBatchPrivate *d;
    friend struct QRhiResourceUpdateBatchPrivate;
    friend class QRhi;
};

880 881
Q_DECLARE_OPERATORS_FOR_FLAGS(QRhiResourceUpdateBatch::TexturePrepareFlags)

882 883 884 885 886 887 888 889
struct Q_RHI_EXPORT QRhiReadbackResult
{
    std::function<void()> completed = nullptr;
    QRhiTexture::Format format;
    QSize pixelSize;
    QByteArray data;
}; // non-movable due to the std::function

890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939
struct Q_RHI_EXPORT QRhiInitParams
{
};

class Q_RHI_EXPORT QRhi
{
public:
    enum Implementation {
        Vulkan,
        OpenGLES2,
        D3D11,
        Metal
    };

    enum FrameOpResult {
        FrameOpSuccess = 0,
        FrameOpError,
        FrameOpSwapChainOutOfDate,
        FrameOpDeviceLost
    };

    enum IndexFormat {
        IndexUInt16,
        IndexUInt32
    };

    ~QRhi();

    static QRhi *create(Implementation impl, QRhiInitParams *params);

    /*
       The underlying graphics resources are created when calling build() and
       put on the release queue by release() (so this is safe even when the
       resource is used by the still executing/pending frame(s)).

       The QRhi* instance itself is not destroyed by the release and it is safe
       to destroy it right away after calling release().

       Changing any value needs explicit release and rebuilding of the
       underlying resource before it can take effect.

       res->build(); <change something>; res->release(); res->build(); ...
       is therefore perfectly valid and can be used to recreate things (when
       buffer or texture size changes f.ex.)

       In addition, just doing res->build(); ...; res->build() is valid too and
       has the same effect due to an implicit release() call made by build()
       when invoked on an object with valid resources underneath.
     */

940 941
    QRhiGraphicsPipeline *newGraphicsPipeline();
    QRhiShaderResourceBindings *newShaderResourceBindings();
942 943 944 945 946 947 948 949

    // Buffers are immutable like other resources but the underlying data can
    // change. (its size cannot) Having multiple frames in flight is handled
    // transparently, with multiple allocations, recording updates, etc.
    // internally. The underlying memory type may differ for static and dynamic
    // buffers. For best performance, static buffers may be copied to device
    // local (not necessarily host visible) memory via a staging (host visible)
    // buffer. Hence separate update-dynamic and upload-static operations.
950 951 952
    QRhiBuffer *newBuffer(QRhiBuffer::Type type,
                          QRhiBuffer::UsageFlags usage,
                          int size);
953 954

    // To be used for depth-stencil when no access is needed afterwards.
Laszlo Agocs's avatar
Laszlo Agocs committed
955 956 957 958
    // Transient image, backed by lazily allocated memory (on Vulkan at least,
    // ideal for tiled GPUs). May also be a dummy internally depending on the
    // backend and the hints (OpenGL, where the winsys interface provides the
    // depth-stencil buffer via the window surface).
959 960 961 962
    QRhiRenderBuffer *newRenderBuffer(QRhiRenderBuffer::Type type,
                                      const QSize &pixelSize,
                                      int sampleCount = 1,
                                      QRhiRenderBuffer::Hints hints = QRhiRenderBuffer::Hints());
963

964 965 966
    QRhiTexture *newTexture(QRhiTexture::Format format,
                            const QSize &pixelSize,
                            QRhiTexture::Flags flags = QRhiTexture::Flags());
967

968 969 970
    QRhiSampler *newSampler(QRhiSampler::Filter magFilter, QRhiSampler::Filter minFilter,
                            QRhiSampler::Filter mipmapMode,
                            QRhiSampler::AddressMode u, QRhiSampler::AddressMode v, QRhiSampler::AddressMode w = QRhiSampler::ClampToEdge);
971

972 973
    QRhiTextureRenderTarget *newTextureRenderTarget(const QRhiTextureRenderTargetDescription &desc,
                                                    QRhiTextureRenderTarget::Flags flags = QRhiTextureRenderTarget::Flags());
974 975

    /*
976
      Rendering to a QWindow (must be Vulkan/Metal/OpenGLSurface as appropriate):
977
        Create a swapchain.
978 979
        Call buildOrResize() on the swapchain whenever the size is different than before.
        Call release() on the swapchain on QPlatformSurfaceEvent::SurfaceAboutToBeDestroyed.
980 981
        Then on every frame:
           beginFrame(sc);
Laszlo Agocs's avatar
Laszlo Agocs committed
982 983
           updates = nextResourceUpdateBatch();
           updates->...
984 985 986 987 988
           beginPass(sc->currentFrameRenderTarget(), sc->currentFrameCommandBuffer(), clearValues, updates);
           ...
           endPass(sc->currentFrameCommandBuffer());
           endFrame(sc); // this queues the Present, begin/endFrame manages double buffering internally
     */
989
    QRhiSwapChain *newSwapChain();
990 991 992
    FrameOpResult beginFrame(QRhiSwapChain *swapChain);
    FrameOpResult endFrame(QRhiSwapChain *swapChain);

993
    /*
994 995 996 997 998 999
      Rendering without a swapchain is possible as well. The typical use case
      is to use it in completely offscreen applications, e.g. to generate image
      sequences by rendering and reading back without ever showing a window.
      Usage in on-screen applications (so beginFrame, endFrame,
      beginOffscreenFrame, endOffscreenFrame, beginFrame, ...) is possible too but
      it does break parallelism so should be done only infrequently.
1000
          QRhiReadbackResult rbResult;
1001 1002 1003
          QRhiCommandBuffer *cb; // not owned
          beginOffscreenFrame(&cb);
          // ... the usual, set up a QRhiTextureRenderTarget, beginPass-endPass, etc.
1004
          readback(cb, rb, &rbResult);
1005
          endOffscreenFrame();
1006
          // image data available in rbResult
1007 1008
     */
    FrameOpResult beginOffscreenFrame(QRhiCommandBuffer **cb);
1009 1010
    FrameOpResult endOffscreenFrame();

1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
    /*
      Readbacks cannot be inside a pass. When used in a begin-endFrame (not
      offscreen), the data may only be available in a future frame. Hence the
      completed callback:
          m_r->beginFrame(sc);
          ...
          QRhiReadbackResult *rbResult = new QRhiReadbackResult;
          rbResult->completed = [rbResult] {
              {
                  QImage::Format fmt = rbResult->format == QRhiTexture::BGRA8 ? QImage::Format_ARGB32_Premultiplied
                                                                              : QImage::Format_RGBA8888_Premultiplied;
                  const uchar *p = reinterpret_cast<const uchar *>(rbResult->data.constData());
                  QImage image(p, rbResult->pixelSize.width(), rbResult->pixelSize.height(), fmt);
                    ...
              }
              delete rbResult;
          };
          QRhiReadbackDescription rb; // no texture -> backbuffer
          m_r->readback(cb, rb, rbResult);
          m_r->endFrame(sc);
     */
1032
    bool readback(QRhiCommandBuffer *cb, const QRhiReadbackDescription &rb, QRhiReadbackResult *result);
1033 1034 1035 1036 1037

    // Waits for any work on the graphics queue (where applicable) to complete,
    // then forcibly executes all deferred operations, like completing
    // readbacks and resource releases. This should _not_ be used in practice,
    // except in infrequent special cases, like when the results of a readback
1038 1039 1040 1041 1042
    // are needed asap and no new frames are going to be generated for some
    // time. Can be called inside and outside of a frame, but not inside a
    // pass. Inside a frame it implies submitting any work on the command
    // buffer. Unnecessary in combination with begin/endOffscreenFrame because
    // ending an offscreen frame implies waiting for completion.
1043
    QRhi::FrameOpResult finish();
1044

1045 1046 1047
    // Returns an instance to which updates can be queued. Batch instances are
    // pooled and never owned by the application. An instance is returned to
    // the pool after a beginPass() processes it or when it is "canceled" by
Laszlo Agocs's avatar
Laszlo Agocs committed
1048 1049
    // calling release(). Can be called outside begin-endFrame as well since
    // a batch instance just collects data on its own.
1050 1051 1052 1053
    QRhiResourceUpdateBatch *nextResourceUpdateBatch();

    void beginPass(QRhiRenderTarget *rt,
                   QRhiCommandBuffer *cb,
1054 1055
                   const QRhiColorClearValue &colorClearValue, // ignored when rt has PreserveColorContents
                   const QRhiDepthStencilClearValue &depthStencilClearValue, // ignored when no ds attachment
1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086
                   QRhiResourceUpdateBatch *resourceUpdates = nullptr);
    void endPass(QRhiCommandBuffer *cb);

    // When specified, srb can be different from ps' srb but the layouts must
    // match. Basic tracking is included: no command is added to the cb when
    // the pipeline or desc.set are the same as in the last call in the same
    // frame; srb is updated automatically at this point whenever a referenced
    // buffer, texture, etc. is out of date internally (due to rebuilding since
    // the creation of the srb) - hence no need to manually recreate the srb in
    // case a QRhiBuffer is "resized" etc.
    void setGraphicsPipeline(QRhiCommandBuffer *cb,
                             QRhiGraphicsPipeline *ps,
                             QRhiShaderResourceBindings *srb = nullptr);

    // The following functions (taking a command buffer) expect to have the
    // pipeline set already on the command buffer. Otherwise, unspecified
    // issues may arise depending on the backend.
    using VertexInput = QPair<QRhiBuffer *, quint32>; // buffer, offset
    void setVertexInput(QRhiCommandBuffer *cb,
                        int startBinding, const QVector<VertexInput> &bindings,
                        QRhiBuffer *indexBuf = nullptr, quint32 indexOffset = 0,
                        IndexFormat indexFormat = IndexUInt16);

    void setViewport(QRhiCommandBuffer *cb, const QRhiViewport &viewport);
    void setScissor(QRhiCommandBuffer *cb, const QRhiScissor &scissor);
    void setBlendConstants(QRhiCommandBuffer *cb, const QVector4D &c);
    void setStencilRef(QRhiCommandBuffer *cb, quint32 refValue);

    void draw(QRhiCommandBuffer *cb, quint32 vertexCount,
              quint32 instanceCount = 1, quint32 firstVertex = 0, quint32 firstInstance = 0);

1087
    // final offset (indexOffset + firstIndex * n) must be 4 byte aligned with some backends
1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107
    void drawIndexed(QRhiCommandBuffer *cb, quint32 indexCount,
                     quint32 instanceCount = 1, quint32 firstIndex = 0,
                     qint32 vertexOffset = 0, quint32 firstInstance = 0);

    QVector<int> supportedSampleCounts() const;

    int ubufAlignment() const;
    int ubufAligned(int v) const;

    int mipLevelsForSize(const QSize &size) const;
    QSize sizeForMipLevel(int mipLevel, const QSize &baseLevelSize) const;

    bool isYUpInFramebuffer() const;

    // Make Y up and allow using 0..1 as the depth range. This lets
    // applications keep using OpenGL-targeted vertex data and perspective
    // matrices regardless of the backend. (by passing this_matrix * mvp,
    // instead of just mvp, to their vertex shaders)
    QMatrix4x4 clipSpaceCorrMatrix() const;

1108
    bool isTextureFormatSupported(QRhiTexture::Format format, QRhiTexture::Flags flags = QRhiTexture::Flags()) const;
1109

1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120
protected:
    QRhi();

private:
    Q_DISABLE_COPY(QRhi)
    QRhiImplementation *d = nullptr;
};

QT_END_NAMESPACE

#endif