qrhigles2.cpp 54.2 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 48 49 50 51 52 53 54 55 56 57 58 59 60 61 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180
/****************************************************************************
**
** 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 "qrhigles2_p.h"
#include <QWindow>
#include <QOffscreenSurface>
#include <QOpenGLContext>
#include <qmath.h>

QT_BEGIN_NAMESPACE

/*
  OpenGL ES 2.0 + GLSL 100/120 backend. Binding vertex attribute locations and
  decomposing uniform buffers into uniforms (as expected by the GLSL 1xx shader
  generated by SPIRV-Cross) are handled transparently to the application via
  the reflection data (QShaderDescription). Textures and buffers feature no
  special logic, it's all just glTexSubImage2D and glBufferSubData (with
  "dynamic" buffers set to GL_DYNAMIC_DRAW). The swapchain and the associated
  renderbuffer for depth-stencil will be dummies since we have no control over
  the underlying buffers here. It is up to the application to create the
  context and window with the appropriate QSurfaceFormat when it comes to
  depth/stencil and MSAA.
*/

QRhiGles2::QRhiGles2(QRhiInitParams *params)
{
    QRhiGles2InitParams *glparams = static_cast<QRhiGles2InitParams *>(params);
    ctx = glparams->context;
    maybeWindow = glparams->window; // may be null
    fallbackSurface = glparams->fallbackSurface;

    create();
}

QRhiGles2::~QRhiGles2()
{
    destroy();
}

void QRhiGles2::ensureContext(QSurface *surface)
{
    bool nativeWindowGone = false;
    if (surface && surface->surfaceClass() == QSurface::Window && !surface->surfaceHandle()) {
        surface = fallbackSurface;
        nativeWindowGone = true;
    }

    if (!surface)
        surface = fallbackSurface;

    if (buffersSwapped)
        buffersSwapped = false;
    else if (!nativeWindowGone && QOpenGLContext::currentContext() == ctx && (surface == fallbackSurface || ctx->surface() == surface))
        return;

    if (!ctx->makeCurrent(surface))
        qWarning("QRhiGles2: Failed to make context current. Expect bad things to happen.");
}

void QRhiGles2::create()
{
    Q_ASSERT(ctx);
    Q_ASSERT(fallbackSurface);

    ensureContext(maybeWindow ? maybeWindow : fallbackSurface); // see 'window' discussion in QRhiGles2InitParams comments

    f = ctx->functions();

    const char *vendor = reinterpret_cast<const char *>(f->glGetString(GL_VENDOR));
    const char *renderer = reinterpret_cast<const char *>(f->glGetString(GL_RENDERER));
    const char *version = reinterpret_cast<const char *>(f->glGetString(GL_VERSION));
    if (vendor && renderer && version)
        qDebug("OpenGL VENDOR: %s RENDERER: %s VERSION: %s", vendor, renderer, version);
}

void QRhiGles2::destroy()
{
    if (!f)
        return;

    ensureContext();
    executeDeferredReleases();

    f = nullptr;
}

// Strictly speaking this is not necessary since we could do the deletes in
// release(). However, it is kind of nice that no release() ever requires a
// current context and so GL calls are isolated to specific places (build,
// beginFrame, endFrame) as much as possible.
void QRhiGles2::executeDeferredReleases()
{
    for (int i = releaseQueue.count() - 1; i >= 0; --i) {
        const QRhiGles2::DeferredReleaseEntry &e(releaseQueue[i]);
        switch (e.type) {
        case QRhiGles2::DeferredReleaseEntry::Buffer:
            f->glDeleteBuffers(1, &e.buffer.buffer);
            break;
        case QRhiGles2::DeferredReleaseEntry::Pipeline:
            f->glDeleteProgram(e.pipeline.program);
            break;
        case QRhiGles2::DeferredReleaseEntry::Texture:
            f->glDeleteTextures(1, &e.texture.texture);
            break;
        case QRhiGles2::DeferredReleaseEntry::RenderBuffer:
            f->glDeleteRenderbuffers(1, &e.renderbuffer.renderbuffer);
            break;
        case QRhiGles2::DeferredReleaseEntry::TextureRenderTarget:
            f->glDeleteFramebuffers(1, &e.textureRenderTarget.framebuffer);
            break;
        default:
            break;
        }
        releaseQueue.removeAt(i);
    }
}

QVector<int> QRhiGles2::supportedSampleCounts() const
{
    return { 1 };
}

QRhiSwapChain *QRhiGles2::createSwapChain()
{
    return new QGles2SwapChain(this);
}

QRhiBuffer *QRhiGles2::createBuffer(QRhiBuffer::Type type, QRhiBuffer::UsageFlags usage, int size)
{
    return new QGles2Buffer(this, type, usage, size);
}

int QRhiGles2::ubufAlignment() const
{
    return 256;
}

bool QRhiGles2::isYUpInFramebuffer() const
{
    return true;
}

QMatrix4x4 QRhiGles2::clipSpaceCorrMatrix() const
{
    return QMatrix4x4(); // identity
}

181 182 183 184 185 186 187 188
bool QRhiGles2::canTextureFormatBeSupported(QRhiTexture::Format format) const
{
    if (format >= QRhiTexture::BC1 && format <= QRhiTexture::BC7)
        return false;

    return true;
}

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
QRhiRenderBuffer *QRhiGles2::createRenderBuffer(QRhiRenderBuffer::Type type, const QSize &pixelSize,
                                                int sampleCount, QRhiRenderBuffer::Hints hints)
{
    return new QGles2RenderBuffer(this, type, pixelSize, sampleCount, hints);
}

QRhiTexture *QRhiGles2::createTexture(QRhiTexture::Format format, const QSize &pixelSize, QRhiTexture::Flags flags)
{
    return new QGles2Texture(this, format, pixelSize, flags);
}

QRhiSampler *QRhiGles2::createSampler(QRhiSampler::Filter magFilter, QRhiSampler::Filter minFilter,
                                      QRhiSampler::Filter mipmapMode,
                                      QRhiSampler::AddressMode u, QRhiSampler::AddressMode v, QRhiSampler::AddressMode w)
{
    return new QGles2Sampler(this, magFilter, minFilter, mipmapMode, u, v, w);
}

QRhiTextureRenderTarget *QRhiGles2::createTextureRenderTarget(const QRhiTextureRenderTargetDescription &desc,
                                                              QRhiTextureRenderTarget::Flags flags)
{
    return new QGles2TextureRenderTarget(this, desc, flags);
}

QRhiGraphicsPipeline *QRhiGles2::createGraphicsPipeline()
{
    return new QGles2GraphicsPipeline(this);
}

QRhiShaderResourceBindings *QRhiGles2::createShaderResourceBindings()
{
    return new QGles2ShaderResourceBindings(this);
}

void QRhiGles2::setGraphicsPipeline(QRhiCommandBuffer *cb, QRhiGraphicsPipeline *ps, QRhiShaderResourceBindings *srb)
{
    Q_ASSERT(inPass);

Laszlo Agocs's avatar
Laszlo Agocs committed
227
    QGles2GraphicsPipeline *psD = QRHI_RES(QGles2GraphicsPipeline, ps);
228
    if (!srb)
Laszlo Agocs's avatar
Laszlo Agocs committed
229
        srb = psD->m_shaderResourceBindings;
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

    QGles2ShaderResourceBindings *srbD = QRHI_RES(QGles2ShaderResourceBindings, srb);
    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);

    const bool pipelineChanged = cbD->currentPipeline != ps || cbD->currentPipelineGeneration != psD->generation;
    const bool srbChanged = cbD->currentSrb != srb || cbD->currentSrbGeneration != srbD->generation;

    if (pipelineChanged || srbChanged) {
        cbD->currentPipeline = ps;
        cbD->currentPipelineGeneration = psD->generation;
        cbD->currentSrb = srb;
        cbD->currentSrbGeneration = srbD->generation;

        QGles2CommandBuffer::Command cmd;
        cmd.cmd = QGles2CommandBuffer::Command::BindGraphicsPipeline;
        cmd.args.bindGraphicsPipeline.ps = ps;
        cmd.args.bindGraphicsPipeline.srb = srb;
        cmd.args.bindGraphicsPipeline.resOnlyChange = !pipelineChanged && srbChanged;
        cbD->commands.append(cmd);
    }
}

void QRhiGles2::setVertexInput(QRhiCommandBuffer *cb, int startBinding, const QVector<QRhi::VertexInput> &bindings,
                               QRhiBuffer *indexBuf, quint32 indexOffset, QRhi::IndexFormat indexFormat)
{
    Q_ASSERT(inPass);
    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);

    for (int i = 0, ie = bindings.count(); i != ie; ++i) {
        QRhiBuffer *buf = bindings[i].first;
        quint32 ofs = bindings[i].second;
        QGles2Buffer *bufD = QRHI_RES(QGles2Buffer, buf);
Laszlo Agocs's avatar
Laszlo Agocs committed
262
        Q_ASSERT(bufD->m_usage.testFlag(QRhiBuffer::VertexBuffer));
263 264 265 266 267 268 269 270 271 272 273
        QGles2CommandBuffer::Command cmd;
        cmd.cmd = QGles2CommandBuffer::Command::BindVertexBuffer;
        cmd.args.bindVertexBuffer.ps = cbD->currentPipeline;
        cmd.args.bindVertexBuffer.buffer = bufD->buffer;
        cmd.args.bindVertexBuffer.offset = ofs;
        cmd.args.bindVertexBuffer.binding = startBinding + i;
        cbD->commands.append(cmd);
    }

    if (indexBuf) {
        QGles2Buffer *ibufD = QRHI_RES(QGles2Buffer, indexBuf);
Laszlo Agocs's avatar
Laszlo Agocs committed
274
        Q_ASSERT(ibufD->m_usage.testFlag(QRhiBuffer::IndexBuffer));
275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405
        QGles2CommandBuffer::Command cmd;
        cmd.cmd = QGles2CommandBuffer::Command::BindIndexBuffer;
        cmd.args.bindIndexBuffer.buffer = ibufD->buffer;
        cmd.args.bindIndexBuffer.offset = indexOffset;
        cmd.args.bindIndexBuffer.type = indexFormat == QRhi::IndexUInt16 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT;
        cbD->commands.append(cmd);
    }
}

void QRhiGles2::setViewport(QRhiCommandBuffer *cb, const QRhiViewport &viewport)
{
    Q_ASSERT(inPass);
    QGles2CommandBuffer::Command cmd;
    cmd.cmd = QGles2CommandBuffer::Command::Viewport;
    cmd.args.viewport.x = viewport.r.x();
    cmd.args.viewport.y = viewport.r.y();
    cmd.args.viewport.w = viewport.r.z();
    cmd.args.viewport.h = viewport.r.w();
    cmd.args.viewport.d0 = viewport.minDepth;
    cmd.args.viewport.d1 = viewport.maxDepth;
    QRHI_RES(QGles2CommandBuffer, cb)->commands.append(cmd);
}

void QRhiGles2::setScissor(QRhiCommandBuffer *cb, const QRhiScissor &scissor)
{
    Q_ASSERT(inPass);
    QGles2CommandBuffer::Command cmd;
    cmd.cmd = QGles2CommandBuffer::Command::Scissor;
    cmd.args.scissor.x = scissor.r.x();
    cmd.args.scissor.y = scissor.r.y();
    cmd.args.scissor.w = scissor.r.z();
    cmd.args.scissor.h = scissor.r.w();
    QRHI_RES(QGles2CommandBuffer, cb)->commands.append(cmd);
}

void QRhiGles2::setBlendConstants(QRhiCommandBuffer *cb, const QVector4D &c)
{
    Q_ASSERT(inPass);
    QGles2CommandBuffer::Command cmd;
    cmd.cmd = QGles2CommandBuffer::Command::BlendConstants;
    cmd.args.blendConstants.r = c.x();
    cmd.args.blendConstants.g = c.y();
    cmd.args.blendConstants.b = c.z();
    cmd.args.blendConstants.a = c.w();
    QRHI_RES(QGles2CommandBuffer, cb)->commands.append(cmd);
}

void QRhiGles2::setStencilRef(QRhiCommandBuffer *cb, quint32 refValue)
{
    Q_ASSERT(inPass);
    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);

    QGles2CommandBuffer::Command cmd;
    cmd.cmd = QGles2CommandBuffer::Command::StencilRef;
    cmd.args.stencilRef.ref = refValue;
    cmd.args.stencilRef.ps = cbD->currentPipeline;
    cbD->commands.append(cmd);
}

void QRhiGles2::draw(QRhiCommandBuffer *cb, quint32 vertexCount,
                     quint32 instanceCount, quint32 firstVertex, quint32 firstInstance)
{
    Q_ASSERT(inPass);
    Q_UNUSED(instanceCount); // no instancing
    Q_UNUSED(firstInstance);
    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);

    QGles2CommandBuffer::Command cmd;
    cmd.cmd = QGles2CommandBuffer::Command::Draw;
    cmd.args.draw.ps = cbD->currentPipeline;
    cmd.args.draw.vertexCount = vertexCount;
    cmd.args.draw.firstVertex = firstVertex;
    cbD->commands.append(cmd);
}

void QRhiGles2::drawIndexed(QRhiCommandBuffer *cb, quint32 indexCount,
                            quint32 instanceCount, quint32 firstIndex, qint32 vertexOffset, quint32 firstInstance)
{
    Q_ASSERT(inPass);
    Q_UNUSED(instanceCount); // no instancing
    Q_UNUSED(firstInstance);
    Q_UNUSED(vertexOffset); // no glDrawElementsBaseVertex
    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);

    QGles2CommandBuffer::Command cmd;
    cmd.cmd = QGles2CommandBuffer::Command::DrawIndexed;
    cmd.args.drawIndexed.ps = cbD->currentPipeline;
    cmd.args.drawIndexed.indexCount = indexCount;
    cmd.args.drawIndexed.firstIndex = firstIndex;
    cbD->commands.append(cmd);
}

QRhi::FrameOpResult QRhiGles2::beginFrame(QRhiSwapChain *swapChain)
{
    Q_ASSERT(!inFrame);

    QGles2SwapChain *swapChainD = QRHI_RES(QGles2SwapChain, swapChain);
    ensureContext(swapChainD->surface);
    inFrame = true;

    executeDeferredReleases();
    QRHI_RES(QGles2CommandBuffer, &swapChainD->cb)->resetState();

    return QRhi::FrameOpSuccess;
}

QRhi::FrameOpResult QRhiGles2::endFrame(QRhiSwapChain *swapChain)
{
    Q_ASSERT(inFrame);

    QGles2SwapChain *swapChainD = QRHI_RES(QGles2SwapChain, swapChain);
    ensureContext(swapChainD->surface);
    executeCommandBuffer(&swapChainD->cb);

    inFrame = false;
    ++finishedFrameCount;

    if (swapChainD->surface) {
        ctx->swapBuffers(swapChainD->surface);
        buffersSwapped = true;
    }

    return QRhi::FrameOpSuccess;
}

void QRhiGles2::commitResourceUpdates(QRhiResourceUpdateBatch *resourceUpdates)
{
    QRhiResourceUpdateBatchPrivate *ud = QRhiResourceUpdateBatchPrivate::get(resourceUpdates);

    for (const QRhiResourceUpdateBatchPrivate::DynamicBufferUpdate &u : ud->dynamicBufferUpdates) {
        QGles2Buffer *bufD = QRHI_RES(QGles2Buffer, u.buf);
Laszlo Agocs's avatar
Laszlo Agocs committed
406 407
        Q_ASSERT(bufD->m_type == QRhiBuffer::Dynamic);
        if (bufD->m_usage.testFlag(QRhiBuffer::UniformBuffer)) {
408 409 410 411 412 413 414 415 416 417 418 419 420 421
            memcpy(bufD->ubuf.data() + u.offset, u.data.constData(), u.data.size());
            QGles2Buffer::ChangeRange &r(bufD->ubufChangeRange);
            if (r.changeBegin == -1 || u.offset < r.changeBegin)
                r.changeBegin = u.offset;
            if (r.changeEnd == -1 || u.offset + u.data.size() > r.changeEnd)
                r.changeEnd = u.offset + u.data.size();
        } else {
            f->glBindBuffer(bufD->target, bufD->buffer);
            f->glBufferSubData(bufD->target, u.offset, u.data.size(), u.data.constData());
        }
    }

    for (const QRhiResourceUpdateBatchPrivate::StaticBufferUpload &u : ud->staticBufferUploads) {
        QGles2Buffer *bufD = QRHI_RES(QGles2Buffer, u.buf);
Laszlo Agocs's avatar
Laszlo Agocs committed
422 423 424
        Q_ASSERT(bufD->m_type != QRhiBuffer::Dynamic);
        Q_ASSERT(u.data.size() == bufD->m_size);
        if (bufD->m_usage.testFlag(QRhiBuffer::UniformBuffer)) {
425 426 427 428 429 430 431 432 433 434
            memcpy(bufD->ubuf.data(), u.data.constData(), u.data.size());
            bufD->ubufChangeRange = { 0, u.data.size() };
        } else {
            f->glBindBuffer(bufD->target, bufD->buffer);
            f->glBufferData(bufD->target, u.data.size(), u.data.constData(), GL_STATIC_DRAW);
        }
    }

    for (const QRhiResourceUpdateBatchPrivate::TextureUpload &u : ud->textureUploads) {
        QGles2Texture *texD = QRHI_RES(QGles2Texture, u.tex);
Laszlo Agocs's avatar
Laszlo Agocs committed
435
        const bool isCubeMap = texD->m_flags.testFlag(QRhiTexture::CubeMap);
436 437
        const GLenum targetBase = isCubeMap ? GL_TEXTURE_CUBE_MAP_POSITIVE_X : texD->target;
        for (int layer = 0, layerCount = u.desc.layers.count(); layer != layerCount; ++layer) {
Laszlo Agocs's avatar
Laszlo Agocs committed
438
            const QRhiTextureUploadDescription::Layer &layerDesc(u.desc.layers[layer]);
439 440
            f->glBindTexture(targetBase + layer, texD->texture);
            for (int level = 0, levelCount = layerDesc.mipImages.count(); level != levelCount; ++level) {
Laszlo Agocs's avatar
Laszlo Agocs committed
441
                const QRhiTextureUploadDescription::Layer::MipLevel mipDesc(layerDesc.mipImages[level]);
442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686
                f->glTexSubImage2D(targetBase + layer, level,
                                   0, 0, mipDesc.image.width(), mipDesc.image.height(),
                                   texD->glformat, texD->gltype, mipDesc.image.constBits());
            }
        }
    }

    ud->free();
}

static inline GLenum toGlTopology(QRhiGraphicsPipeline::Topology t)
{
    switch (t) {
    case QRhiGraphicsPipeline::Triangles:
        return GL_TRIANGLES;
    case QRhiGraphicsPipeline::TriangleStrip:
        return GL_TRIANGLE_STRIP;
    case QRhiGraphicsPipeline::Lines:
        return GL_LINES;
    case QRhiGraphicsPipeline::LineStrip:
        return GL_LINE_STRIP;
    case QRhiGraphicsPipeline::Points:
        return GL_POINTS;
    default:
        Q_UNREACHABLE();
        return GL_TRIANGLES;
    }
}

static inline GLenum toGlCullMode(QRhiGraphicsPipeline::CullMode c)
{
    switch (c) {
    case QRhiGraphicsPipeline::Front:
        return GL_FRONT;
    case QRhiGraphicsPipeline::Back:
        return GL_BACK;
    default:
        Q_UNREACHABLE();
        return GL_BACK;
    }
}

static inline GLenum toGlFrontFace(QRhiGraphicsPipeline::FrontFace f)
{
    switch (f) {
    case QRhiGraphicsPipeline::CCW:
        return GL_CCW;
    case QRhiGraphicsPipeline::CW:
        return GL_CW;
    default:
        Q_UNREACHABLE();
        return GL_CCW;
    }
}

static inline GLenum toGlBlendFactor(QRhiGraphicsPipeline::BlendFactor f)
{
    switch (f) {
    case QRhiGraphicsPipeline::Zero:
        return GL_ZERO;
    case QRhiGraphicsPipeline::One:
        return GL_ONE;
    case QRhiGraphicsPipeline::SrcColor:
        return GL_SRC_COLOR;
    case QRhiGraphicsPipeline::OneMinusSrcColor:
        return GL_ONE_MINUS_SRC_COLOR;
    case QRhiGraphicsPipeline::DstColor:
        return GL_DST_COLOR;
    case QRhiGraphicsPipeline::OneMinusDstColor:
        return GL_ONE_MINUS_DST_COLOR;
    case QRhiGraphicsPipeline::SrcAlpha:
        return GL_SRC_ALPHA;
    case QRhiGraphicsPipeline::OneMinusSrcAlpha:
        return GL_ONE_MINUS_SRC_ALPHA;
    case QRhiGraphicsPipeline::DstAlpha:
        return GL_DST_ALPHA;
    case QRhiGraphicsPipeline::OneMinusDstAlpha:
        return GL_ONE_MINUS_DST_ALPHA;
    case QRhiGraphicsPipeline::ConstantColor:
        return GL_CONSTANT_COLOR;
    case QRhiGraphicsPipeline::OneMinusConstantColor:
        return GL_ONE_MINUS_CONSTANT_COLOR;
    case QRhiGraphicsPipeline::ConstantAlpha:
        return GL_CONSTANT_ALPHA;
    case QRhiGraphicsPipeline::OneMinusConstantAlpha:
        return GL_ONE_MINUS_CONSTANT_ALPHA;
    case QRhiGraphicsPipeline::SrcAlphaSaturate:
        return GL_SRC_ALPHA_SATURATE;
    case QRhiGraphicsPipeline::Src1Color:
        Q_FALLTHROUGH();
    case QRhiGraphicsPipeline::OneMinusSrc1Color:
        Q_FALLTHROUGH();
    case QRhiGraphicsPipeline::Src1Alpha:
        Q_FALLTHROUGH();
    case QRhiGraphicsPipeline::OneMinusSrc1Alpha:
        qWarning("Unsupported blend factor %d", f);
        return GL_ZERO;
    default:
        Q_UNREACHABLE();
        return GL_ZERO;
    }
}

static inline GLenum toGlBlendOp(QRhiGraphicsPipeline::BlendOp op)
{
    switch (op) {
    case QRhiGraphicsPipeline::Add:
        return GL_FUNC_ADD;
    case QRhiGraphicsPipeline::Subtract:
        return GL_FUNC_SUBTRACT;
    case QRhiGraphicsPipeline::ReverseSubtract:
        return GL_FUNC_REVERSE_SUBTRACT;
    case QRhiGraphicsPipeline::Min:
        return GL_MIN;
    case QRhiGraphicsPipeline::Max:
        return GL_MAX;
    default:
        Q_UNREACHABLE();
        return GL_FUNC_ADD;
    }
}

static inline GLenum toGlCompareOp(QRhiGraphicsPipeline::CompareOp op)
{
    switch (op) {
    case QRhiGraphicsPipeline::Never:
        return GL_NEVER;
    case QRhiGraphicsPipeline::Less:
        return GL_LESS;
    case QRhiGraphicsPipeline::Equal:
        return GL_EQUAL;
    case QRhiGraphicsPipeline::LessOrEqual:
        return GL_LEQUAL;
    case QRhiGraphicsPipeline::Greater:
        return GL_GREATER;
    case QRhiGraphicsPipeline::NotEqual:
        return GL_NOTEQUAL;
    case QRhiGraphicsPipeline::GreaterOrEqual:
        return GL_GEQUAL;
    case QRhiGraphicsPipeline::Always:
        return GL_ALWAYS;
    default:
        Q_UNREACHABLE();
        return GL_ALWAYS;
    }
}

static inline GLenum toGlStencilOp(QRhiGraphicsPipeline::StencilOp op)
{
    switch (op) {
    case QRhiGraphicsPipeline::StencilZero:
        return GL_ZERO;
    case QRhiGraphicsPipeline::Keep:
        return GL_KEEP;
    case QRhiGraphicsPipeline::Replace:
        return GL_REPLACE;
    case QRhiGraphicsPipeline::IncrementAndClamp:
        return GL_INCR;
    case QRhiGraphicsPipeline::DecrementAndClamp:
        return GL_DECR;
    case QRhiGraphicsPipeline::Invert:
        return GL_INVERT;
    case QRhiGraphicsPipeline::IncrementAndWrap:
        return GL_INCR_WRAP;
    case QRhiGraphicsPipeline::DecrementAndWrap:
        return GL_DECR_WRAP;
    default:
        Q_UNREACHABLE();
        return GL_KEEP;
    }
}

static inline GLenum toGlMinFilter(QRhiSampler::Filter f, QRhiSampler::Filter m)
{
    switch (f) {
    case QRhiSampler::Nearest:
        if (m == QRhiSampler::None)
            return GL_NEAREST;
        else
            return m == QRhiSampler::Nearest ? GL_NEAREST_MIPMAP_NEAREST : GL_NEAREST_MIPMAP_LINEAR;
    case QRhiSampler::Linear:
        if (m == QRhiSampler::None)
            return GL_LINEAR;
        else
            return m == QRhiSampler::Nearest ? GL_LINEAR_MIPMAP_NEAREST : GL_LINEAR_MIPMAP_LINEAR;
    default:
        Q_UNREACHABLE();
        return GL_LINEAR;
    }
}

static inline GLenum toGlMagFilter(QRhiSampler::Filter f)
{
    switch (f) {
    case QRhiSampler::Nearest:
        return GL_NEAREST;
    case QRhiSampler::Linear:
        return GL_LINEAR;
    default:
        Q_UNREACHABLE();
        return GL_LINEAR;
    }
}

static inline GLenum toGlWrapMode(QRhiSampler::AddressMode m)
{
    switch (m) {
    case QRhiSampler::Repeat:
        return GL_REPEAT;
    case QRhiSampler::ClampToEdge:
        return GL_CLAMP_TO_EDGE;
    case QRhiSampler::Mirror:
        return GL_MIRRORED_REPEAT;
    case QRhiSampler::MirrorOnce:
        Q_FALLTHROUGH();
    case QRhiSampler::Border:
        qWarning("Unsupported wrap mode %d", m);
        return GL_CLAMP_TO_EDGE;
    default:
        Q_UNREACHABLE();
        return GL_CLAMP_TO_EDGE;
    }
}

void QRhiGles2::executeCommandBuffer(QRhiCommandBuffer *cb)
{
    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);
    GLenum indexType = GL_UNSIGNED_SHORT;
    quint32 indexStride = sizeof(quint16);
    quint32 indexOffset = 0;

    for (const QGles2CommandBuffer::Command &cmd : qAsConst(cbD->commands)) {
        switch (cmd.cmd) {
        case QGles2CommandBuffer::Command::Viewport:
            f->glViewport(cmd.args.viewport.x, cmd.args.viewport.y, cmd.args.viewport.w, cmd.args.viewport.h);
            f->glDepthRangef(cmd.args.viewport.d0, cmd.args.viewport.d1);
            break;
        case QGles2CommandBuffer::Command::Scissor:
            f->glScissor(cmd.args.scissor.x, cmd.args.scissor.y, cmd.args.scissor.w, cmd.args.scissor.h);
            break;
        case QGles2CommandBuffer::Command::BlendConstants:
            f->glBlendColor(cmd.args.blendConstants.r, cmd.args.blendConstants.g, cmd.args.blendConstants.b, cmd.args.blendConstants.a);
            break;
        case QGles2CommandBuffer::Command::StencilRef:
        {
Laszlo Agocs's avatar
Laszlo Agocs committed
687 688 689 690
            QGles2GraphicsPipeline *psD = QRHI_RES(QGles2GraphicsPipeline, cmd.args.stencilRef.ps);
            if (psD) {
                f->glStencilFuncSeparate(GL_FRONT, toGlCompareOp(psD->m_stencilFront.compareOp), cmd.args.stencilRef.ref, psD->m_stencilReadMask);
                f->glStencilFuncSeparate(GL_BACK, toGlCompareOp(psD->m_stencilBack.compareOp), cmd.args.stencilRef.ref, psD->m_stencilReadMask);
691 692 693 694 695 696 697
            } else {
                qWarning("No graphics pipeline active for setStencilRef; ignored");
            }
        }
            break;
        case QGles2CommandBuffer::Command::BindVertexBuffer:
        {
Laszlo Agocs's avatar
Laszlo Agocs committed
698 699 700
            QGles2GraphicsPipeline *psD = QRHI_RES(QGles2GraphicsPipeline, cmd.args.bindVertexBuffer.ps);
            if (psD) {
                for (const QRhiVertexInputLayout::Attribute &a : psD->m_vertexInputLayout.attributes) {
701 702 703 704 705 706
                    if (a.binding != cmd.args.bindVertexBuffer.binding)
                        continue;

                    // we do not support more than one vertex buffer
                    f->glBindBuffer(GL_ARRAY_BUFFER, cmd.args.bindVertexBuffer.buffer);

Laszlo Agocs's avatar
Laszlo Agocs committed
707
                    const int stride = psD->m_vertexInputLayout.bindings[a.binding].stride;
708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759
                    int size = 1;
                    GLenum type = GL_FLOAT;
                    switch (a.format) {
                    case QRhiVertexInputLayout::Attribute::Float4:
                        type = GL_FLOAT;
                        size = 4;
                        break;
                    case QRhiVertexInputLayout::Attribute::Float3:
                        type = GL_FLOAT;
                        size = 3;
                        break;
                    case QRhiVertexInputLayout::Attribute::Float2:
                        type = GL_FLOAT;
                        size = 2;
                        break;
                    case QRhiVertexInputLayout::Attribute::Float:
                        type = GL_FLOAT;
                        size = 1;
                        break;
                    case QRhiVertexInputLayout::Attribute::UNormByte4:
                        type = GL_UNSIGNED_BYTE;
                        size = 4;
                        break;
                    case QRhiVertexInputLayout::Attribute::UNormByte2:
                        type = GL_UNSIGNED_BYTE;
                        size = 2;
                        break;
                    case QRhiVertexInputLayout::Attribute::UNormByte:
                        type = GL_UNSIGNED_BYTE;
                        size = 1;
                        break;
                    default:
                        break;
                    }
                    quint32 ofs = a.offset + cmd.args.bindVertexBuffer.offset;
                    f->glVertexAttribPointer(a.location, size, type, GL_FALSE, stride,
                                             reinterpret_cast<const GLvoid *>(quintptr(ofs)));
                    f->glEnableVertexAttribArray(a.location);
                }
            } else {
                qWarning("No graphics pipeline active for setVertexInput; ignored");
            }
        }
            break;
        case QGles2CommandBuffer::Command::BindIndexBuffer:
            indexType = cmd.args.bindIndexBuffer.type;
            indexStride = indexType == GL_UNSIGNED_SHORT ? sizeof(quint16) : sizeof(quint32);
            indexOffset = cmd.args.bindIndexBuffer.offset;
            f->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cmd.args.bindIndexBuffer.buffer);
            break;
        case QGles2CommandBuffer::Command::Draw:
        {
Laszlo Agocs's avatar
Laszlo Agocs committed
760 761 762
            QGles2GraphicsPipeline *psD = QRHI_RES(QGles2GraphicsPipeline, cmd.args.draw.ps);
            if (psD)
                f->glDrawArrays(psD->drawMode, cmd.args.draw.firstVertex, cmd.args.draw.vertexCount);
763 764 765 766 767 768
            else
                qWarning("No graphics pipeline active for draw; ignored");
        }
            break;
        case QGles2CommandBuffer::Command::DrawIndexed:
        {
Laszlo Agocs's avatar
Laszlo Agocs committed
769 770
            QGles2GraphicsPipeline *psD = QRHI_RES(QGles2GraphicsPipeline, cmd.args.drawIndexed.ps);
            if (psD) {
771
                quint32 ofs = cmd.args.drawIndexed.firstIndex * indexStride + indexOffset;
Laszlo Agocs's avatar
Laszlo Agocs committed
772
                f->glDrawElements(psD->drawMode,
773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824
                                  cmd.args.drawIndexed.indexCount,
                                  indexType,
                                  reinterpret_cast<const GLvoid *>(quintptr(ofs)));
            } else {
                qWarning("No graphics pipeline active for drawIndexed; ignored");
            }
        }
            break;
        case QGles2CommandBuffer::Command::BindGraphicsPipeline:
            if (cmd.args.bindGraphicsPipeline.resOnlyChange) {
                setChangedUniforms(QRHI_RES(QGles2GraphicsPipeline, cmd.args.bindGraphicsPipeline.ps),
                                   cmd.args.bindGraphicsPipeline.srb,
                                   false);
            } else {
                executeBindGraphicsPipeline(cmd.args.bindGraphicsPipeline.ps, cmd.args.bindGraphicsPipeline.srb);
            }
            break;
        case QGles2CommandBuffer::Command::BindFramebuffer:
            if (cmd.args.bindFramebuffer.rt)
                f->glBindFramebuffer(GL_FRAMEBUFFER,
                                     QRHI_RES(QGles2TextureRenderTarget, cmd.args.bindFramebuffer.rt)->framebuffer);
            else
                f->glBindFramebuffer(GL_FRAMEBUFFER, ctx->defaultFramebufferObject());
            break;
        case QGles2CommandBuffer::Command::Clear:
            f->glDisable(GL_SCISSOR_TEST);
            if (cmd.args.clear.mask & GL_COLOR_BUFFER_BIT) {
                f->glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
                f->glClearColor(cmd.args.clear.c[0], cmd.args.clear.c[1], cmd.args.clear.c[2], cmd.args.clear.c[3]);
            }
            if (cmd.args.clear.mask & GL_DEPTH_BUFFER_BIT) {
                f->glDepthMask(GL_TRUE);
                f->glClearDepthf(cmd.args.clear.d);
            }
            if (cmd.args.clear.mask & GL_STENCIL_BUFFER_BIT) {
                f->glStencilMask(GL_TRUE);
                f->glClearStencil(cmd.args.clear.s);
            }
            f->glClear(cmd.args.clear.mask);
            break;
        default:
            break;
        }
    }
}

void QRhiGles2::executeBindGraphicsPipeline(QRhiGraphicsPipeline *ps, QRhiShaderResourceBindings *srb)
{
    QGles2GraphicsPipeline *psD = QRHI_RES(QGles2GraphicsPipeline, ps);

    // ### this needs some proper caching later on to minimize state changes

Laszlo Agocs's avatar
Laszlo Agocs committed
825
    if (psD->m_flags.testFlag(QRhiGraphicsPipeline::UsesScissor))
826 827 828
        f->glEnable(GL_SCISSOR_TEST);
    else
        f->glDisable(GL_SCISSOR_TEST);
Laszlo Agocs's avatar
Laszlo Agocs committed
829
    if (psD->m_cullMode == QRhiGraphicsPipeline::None) {
830 831 832
        f->glDisable(GL_CULL_FACE);
    } else {
        f->glEnable(GL_CULL_FACE);
Laszlo Agocs's avatar
Laszlo Agocs committed
833
        f->glCullFace(toGlCullMode(psD->m_cullMode));
834
    }
Laszlo Agocs's avatar
Laszlo Agocs committed
835 836 837
    f->glFrontFace(toGlFrontFace(psD->m_frontFace));
    if (!psD->m_targetBlends.isEmpty()) {
        const QRhiGraphicsPipeline::TargetBlend &blend(psD->m_targetBlends.first()); // no MRT
838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855
        GLboolean wr = blend.colorWrite.testFlag(QRhiGraphicsPipeline::R);
        GLboolean wg = blend.colorWrite.testFlag(QRhiGraphicsPipeline::G);
        GLboolean wb = blend.colorWrite.testFlag(QRhiGraphicsPipeline::B);
        GLboolean wa = blend.colorWrite.testFlag(QRhiGraphicsPipeline::A);
        f->glColorMask(wr, wg, wb, wa);
        if (blend.enable) {
            f->glEnable(GL_BLEND);
            f->glBlendFuncSeparate(toGlBlendFactor(blend.srcColor),
                                   toGlBlendFactor(blend.dstColor),
                                   toGlBlendFactor(blend.srcAlpha),
                                   toGlBlendFactor(blend.dstAlpha));
            f->glBlendEquationSeparate(toGlBlendOp(blend.opColor), toGlBlendOp(blend.opAlpha));
        } else {
            f->glDisable(GL_BLEND);
        }
    } else {
        f->glDisable(GL_BLEND);
    }
Laszlo Agocs's avatar
Laszlo Agocs committed
856
    if (psD->m_depthTest)
857 858 859
        f->glEnable(GL_DEPTH_TEST);
    else
        f->glDisable(GL_DEPTH_TEST);
Laszlo Agocs's avatar
Laszlo Agocs committed
860
    if (psD->m_depthWrite)
861 862 863
        f->glDepthMask(GL_TRUE);
    else
        f->glDepthMask(GL_FALSE);
Laszlo Agocs's avatar
Laszlo Agocs committed
864 865
    f->glDepthFunc(toGlCompareOp(psD->m_depthOp));
    if (psD->m_stencilTest) {
866
        f->glEnable(GL_STENCIL_TEST);
Laszlo Agocs's avatar
Laszlo Agocs committed
867
        f->glStencilFuncSeparate(GL_FRONT, toGlCompareOp(psD->m_stencilFront.compareOp), 0, psD->m_stencilReadMask);
868
        f->glStencilOpSeparate(GL_FRONT,
Laszlo Agocs's avatar
Laszlo Agocs committed
869 870 871 872 873
                               toGlStencilOp(psD->m_stencilFront.failOp),
                               toGlStencilOp(psD->m_stencilFront.depthFailOp),
                               toGlStencilOp(psD->m_stencilFront.passOp));
        f->glStencilMaskSeparate(GL_FRONT, psD->m_stencilWriteMask);
        f->glStencilFuncSeparate(GL_BACK, toGlCompareOp(psD->m_stencilBack.compareOp), 0, psD->m_stencilReadMask);
874
        f->glStencilOpSeparate(GL_BACK,
Laszlo Agocs's avatar
Laszlo Agocs committed
875 876 877 878
                               toGlStencilOp(psD->m_stencilBack.failOp),
                               toGlStencilOp(psD->m_stencilBack.depthFailOp),
                               toGlStencilOp(psD->m_stencilBack.passOp));
        f->glStencilMaskSeparate(GL_BACK, psD->m_stencilWriteMask);
879 880 881 882 883 884 885 886 887 888 889
    } else {
        f->glDisable(GL_STENCIL_TEST);
    }

    f->glUseProgram(psD->program);
    // buffer data cannot change within the pass so this time is as good to update uniforms as any
    setChangedUniforms(psD, srb, false);
}

void QRhiGles2::setChangedUniforms(QGles2GraphicsPipeline *psD, QRhiShaderResourceBindings *srb, bool changedOnly)
{
Laszlo Agocs's avatar
Laszlo Agocs committed
890 891 892
    QGles2ShaderResourceBindings *srbD = QRHI_RES(QGles2ShaderResourceBindings, srb);
    for (int i = 0, ie = srbD->m_bindings.count(); i != ie; ++i) {
        const QRhiShaderResourceBinding &b(srbD->m_bindings[i]);
893
        switch (b.type) {
Laszlo Agocs's avatar
Laszlo Agocs committed
894
        case QRhiShaderResourceBinding::UniformBuffer:
895 896 897 898 899
        {
            QGles2Buffer *bufD = QRHI_RES(QGles2Buffer, b.ubuf.buf);
            if (changedOnly && bufD->ubufChangeRange.isNull()) // do not set again when nothing changed
                break;
            const QByteArray bufView = QByteArray::fromRawData(bufD->ubuf.constData() + b.ubuf.offset,
Laszlo Agocs's avatar
Laszlo Agocs committed
900
                                                               b.ubuf.maybeSize ? b.ubuf.maybeSize : bufD->m_size);
901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952
            for (QGles2GraphicsPipeline::Uniform &uniform : psD->uniforms) {
                if (uniform.binding == b.binding
                        && (!changedOnly ||
                            (uniform.offset >= uint(bufD->ubufChangeRange.changeBegin)
                             && uniform.offset < uint(bufD->ubufChangeRange.changeEnd))))
                {
                    memcpy(uniform.data.data(), bufView.constData() + uniform.offset, uniform.data.size());

                    switch (uniform.type) {
                    case QShaderDescription::Float:
                        f->glUniform1f(uniform.glslLocation, *reinterpret_cast<const float *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Vec2:
                        f->glUniform2fv(uniform.glslLocation, 1, reinterpret_cast<const float *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Vec3:
                        f->glUniform3fv(uniform.glslLocation, 1, reinterpret_cast<const float *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Vec4:
                        f->glUniform4fv(uniform.glslLocation, 1, reinterpret_cast<const float *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Mat2:
                        f->glUniformMatrix2fv(uniform.glslLocation, 1, GL_FALSE, reinterpret_cast<const float *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Mat3:
                        f->glUniformMatrix3fv(uniform.glslLocation, 1, GL_FALSE, reinterpret_cast<const float *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Mat4:
                        f->glUniformMatrix4fv(uniform.glslLocation, 1, GL_FALSE, reinterpret_cast<const float *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Int:
                        f->glUniform1i(uniform.glslLocation, *reinterpret_cast<const qint32 *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Int2:
                        f->glUniform2iv(uniform.glslLocation, 1, reinterpret_cast<const qint32 *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Int3:
                        f->glUniform3iv(uniform.glslLocation, 1, reinterpret_cast<const qint32 *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Int4:
                        f->glUniform4iv(uniform.glslLocation, 1, reinterpret_cast<const qint32 *>(uniform.data.constData()));
                        break;
                    // ### more types
                    default:
                        break;
                    }
                }
            }

            bufD->ubufChangeRange = QGles2Buffer::ChangeRange();
        }
            break;
Laszlo Agocs's avatar
Laszlo Agocs committed
953
        case QRhiShaderResourceBinding::SampledTexture:
954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
        {
            QGles2Texture *texD = QRHI_RES(QGles2Texture, b.stex.tex);
            QGles2Sampler *samplerD = QRHI_RES(QGles2Sampler, b.stex.sampler);

            int texUnit = 0;
            for (QGles2GraphicsPipeline::Sampler &sampler : psD->samplers) {
                if (sampler.binding == b.binding) {
                    // ### should this use sampler->generation or something to prevent doing it over and over again
                    f->glActiveTexture(GL_TEXTURE0 + texUnit);
                    f->glBindTexture(texD->target, texD->texture);

                    f->glTexParameteri(texD->target, GL_TEXTURE_MIN_FILTER, samplerD->glminfilter);
                    f->glTexParameteri(texD->target, GL_TEXTURE_MAG_FILTER, samplerD->glmagfilter);
                    f->glTexParameteri(texD->target, GL_TEXTURE_WRAP_S, samplerD->glwraps);
                    f->glTexParameteri(texD->target, GL_TEXTURE_WRAP_T, samplerD->glwrapt);
                    f->glTexParameteri(texD->target, GL_TEXTURE_WRAP_R, samplerD->glwrapr);

                    f->glUniform1i(sampler.glslLocation, texUnit);
                    ++texUnit;
                }
            }
            if (texUnit)
                f->glActiveTexture(GL_TEXTURE0);
        }
            break;
        default:
            Q_UNREACHABLE();
            break;
        }
    }
}

void QRhiGles2::beginPass(QRhiRenderTarget *rt,
                          QRhiCommandBuffer *cb,
                          const QRhiColorClearValue &colorClearValue,
                          const QRhiDepthStencilClearValue &depthStencilClearValue,
                          QRhiResourceUpdateBatch *resourceUpdates)
{
    Q_ASSERT(!inPass);

    if (resourceUpdates)
        commitResourceUpdates(resourceUpdates);

    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);
    bool needsColorClear = true;
    QGles2BasicRenderTargetData *rtD = nullptr;
    QGles2CommandBuffer::Command fbCmd;
    fbCmd.cmd = QGles2CommandBuffer::Command::BindFramebuffer;
    switch (rt->type()) {
    case QRhiRenderTarget::RtRef:
        rtD = &QRHI_RES(QGles2ReferenceRenderTarget, rt)->d;
        fbCmd.args.bindFramebuffer.rt = nullptr;
        break;
    case QRhiRenderTarget::RtTexture:
    {
        QGles2TextureRenderTarget *rtTex = QRHI_RES(QGles2TextureRenderTarget, rt);
        rtD = &rtTex->d;
Laszlo Agocs's avatar
Laszlo Agocs committed
1011
        needsColorClear = !rtTex->m_flags.testFlag(QRhiTextureRenderTarget::PreserveColorContents);
1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077
        fbCmd.args.bindFramebuffer.rt = rtTex;
    }
        break;
    default:
        Q_UNREACHABLE();
        break;
    }
    cbD->commands.append(fbCmd);

    cbD->currentTarget = rt;

    Q_ASSERT(rtD->attCount == 1 || rtD->attCount == 2);
    QGles2CommandBuffer::Command clearCmd;
    clearCmd.cmd = QGles2CommandBuffer::Command::Clear;
    clearCmd.args.clear.mask = 0;
    if (rtD->attCount > 1)
        clearCmd.args.clear.mask |= GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT;
    if (needsColorClear)
        clearCmd.args.clear.mask |= GL_COLOR_BUFFER_BIT;

    memcpy(clearCmd.args.clear.c, &colorClearValue.rgba, sizeof(float) * 4);
    clearCmd.args.clear.d = depthStencilClearValue.d;
    clearCmd.args.clear.s = depthStencilClearValue.s;

    cbD->commands.append(clearCmd);

    inPass = true;
}

void QRhiGles2::endPass(QRhiCommandBuffer *cb)
{
    Q_ASSERT(inPass);
    inPass = false;

    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);
    cbD->currentTarget = nullptr;
}

QGles2Buffer::QGles2Buffer(QRhiImplementation *rhi, Type type, UsageFlags usage, int size)
    : QRhiBuffer(rhi, type, usage, size)
{
}

void QGles2Buffer::release()
{
    if (!buffer)
        return;

    QRhiGles2::DeferredReleaseEntry e;
    e.type = QRhiGles2::DeferredReleaseEntry::Buffer;

    e.buffer.buffer = buffer;

    buffer = 0;

    QRHI_RES_RHI(QRhiGles2);
    rhiD->releaseQueue.append(e);
}

bool QGles2Buffer::build()
{
    QRHI_RES_RHI(QRhiGles2);

    if (buffer)
        release();

Laszlo Agocs's avatar
Laszlo Agocs committed
1078
    if (m_usage.testFlag(QRhiBuffer::UniformBuffer)) {
1079
        // special since we do not support uniform blocks in this backend
Laszlo Agocs's avatar
Laszlo Agocs committed
1080
        ubuf.resize(m_size);
1081 1082 1083 1084 1085
        return true;
    }

    rhiD->ensureContext();

Laszlo Agocs's avatar
Laszlo Agocs committed
1086
    if (m_usage.testFlag(QRhiBuffer::VertexBuffer))
1087
        target = GL_ARRAY_BUFFER;
Laszlo Agocs's avatar
Laszlo Agocs committed
1088
    if (m_usage.testFlag(QRhiBuffer::IndexBuffer))
1089 1090 1091 1092
        target = GL_ELEMENT_ARRAY_BUFFER;

    rhiD->f->glGenBuffers(1, &buffer);
    rhiD->f->glBindBuffer(target, buffer);
Laszlo Agocs's avatar
Laszlo Agocs committed
1093
    rhiD->f->glBufferData(target, m_size, nullptr, m_type == Dynamic ? GL_DYNAMIC_DRAW : GL_STATIC_DRAW);
1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126

    return true;
}

QGles2RenderBuffer::QGles2RenderBuffer(QRhiImplementation *rhi, Type type, const QSize &pixelSize,
                                       int sampleCount, QRhiRenderBuffer::Hints hints)
    : QRhiRenderBuffer(rhi, type, pixelSize, sampleCount, hints)
{
}

void QGles2RenderBuffer::release()
{
    if (!renderbuffer)
        return;

    QRhiGles2::DeferredReleaseEntry e;
    e.type = QRhiGles2::DeferredReleaseEntry::RenderBuffer;

    e.renderbuffer.renderbuffer = renderbuffer;

    renderbuffer = 0;

    QRHI_RES_RHI(QRhiGles2);
    rhiD->releaseQueue.append(e);
}

bool QGles2RenderBuffer::build()
{
    QRHI_RES_RHI(QRhiGles2);

    if (renderbuffer)
        release();

Laszlo Agocs's avatar
Laszlo Agocs committed
1127
    if (m_hints.testFlag(ToBeUsedWithSwapChainOnly))
1128 1129 1130 1131 1132 1133 1134
        return true;

    rhiD->ensureContext();

    rhiD->f->glGenRenderbuffers(1, &renderbuffer);
    rhiD->f->glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);

Laszlo Agocs's avatar
Laszlo Agocs committed
1135
    switch (m_type) {
1136
    case QRhiRenderBuffer::DepthStencil:
Laszlo Agocs's avatar
Laszlo Agocs committed
1137
        rhiD->f->glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, m_pixelSize.width(), m_pixelSize.height());
1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 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
        break;
    default:
        Q_UNREACHABLE();
        break;
    }

    return true;
}

QGles2Texture::QGles2Texture(QRhiImplementation *rhi, Format format, const QSize &pixelSize, Flags flags)
    : QRhiTexture(rhi, format, pixelSize, flags)
{
}

static inline QSize safeSize(const QSize &size)
{
    return size.isEmpty() ? QSize(16, 16) : size;
}

void QGles2Texture::release()
{
    if (!texture)
        return;

    QRhiGles2::DeferredReleaseEntry e;
    e.type = QRhiGles2::DeferredReleaseEntry::Texture;

    e.texture.texture = texture;

    texture = 0;

    QRHI_RES_RHI(QRhiGles2);
    rhiD->releaseQueue.append(e);
}

bool QGles2Texture::build()
{
    QRHI_RES_RHI(QRhiGles2);

    if (texture)
        release();

    rhiD->ensureContext();

Laszlo Agocs's avatar
Laszlo Agocs committed
1182
    const QSize size = safeSize(m_pixelSize);
1183 1184
    // ### adjust size for npot when repeat with npot is not supported?

Laszlo Agocs's avatar
Laszlo Agocs committed
1185 1186
    const bool isCube = m_flags.testFlag(CubeMap);
    const bool hasMipMaps = m_flags.testFlag(MipMapped);
1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201
    const int mipLevelCount = hasMipMaps ? qCeil(log2(qMax(size.width(), size.height()))) + 1 : 1;

    // ### more formats
    target = isCube ? GL_TEXTURE_CUBE_MAP : GL_TEXTURE_2D;
    glintformat = GL_RGBA;
    glformat = GL_RGBA;
    gltype = GL_UNSIGNED_BYTE;

    rhiD->f->glGenTextures(1, &texture);
    if (hasMipMaps || isCube) {
        const GLenum targetBase = isCube ? GL_TEXTURE_CUBE_MAP_POSITIVE_X : target;
        for (int layer = 0, layerCount = isCube ? 6 : 1; layer != layerCount; ++layer) {
            rhiD->f->glBindTexture(targetBase + layer, texture);
            for (int level = 0; level != mipLevelCount; ++level) {
                rhiD->f->glTexImage2D(targetBase + layer, level, glintformat,
1202
                                      qFloor(float(qMax(1, size.width() >> level))), qFloor(float(qMax(1, size.height() >> level))),
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226
                                      0, glformat, gltype, nullptr);
            }
        }
    } else {
        rhiD->f->glBindTexture(target, texture);
        rhiD->f->glTexImage2D(target, 0, glintformat, size.width(), size.height(), 0, glformat, gltype, nullptr);
    }

    return true;
}

QGles2Sampler::QGles2Sampler(QRhiImplementation *rhi, Filter magFilter, Filter minFilter, Filter mipmapMode,
                             AddressMode u, AddressMode v, AddressMode w)
    : QRhiSampler(rhi, magFilter, minFilter, mipmapMode, u, v, w)
{
}

void QGles2Sampler::release()
{
    // nothing to do here
}

bool QGles2Sampler::build()
{
Laszlo Agocs's avatar
Laszlo Agocs committed
1227 1228 1229 1230 1231
    glminfilter = toGlMinFilter(m_minFilter, m_mipmapMode);
    glmagfilter = toGlMagFilter(m_magFilter);
    glwraps = toGlWrapMode(m_addressU);
    glwrapt = toGlWrapMode(m_addressV);
    glwrapr = toGlWrapMode(m_addressW);
1232 1233 1234 1235

    return true;
}

Laszlo Agocs's avatar
Laszlo Agocs committed
1236
// dummy, no Vulkan-style RenderPass+Framebuffer concept here
1237 1238
QGles2RenderPassDescriptor::QGles2RenderPassDescriptor(QRhiImplementation *rhi)
    : QRhiRenderPassDescriptor(rhi)
1239 1240 1241
{
}

1242
void QGles2RenderPassDescriptor::release()
1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 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 1288 1289 1290 1291
{
    // nothing to do here
}

QGles2ReferenceRenderTarget::QGles2ReferenceRenderTarget(QRhiImplementation *rhi)
    : QRhiReferenceRenderTarget(rhi),
      d(rhi)
{
}

void QGles2ReferenceRenderTarget::release()
{
    // nothing to do here
}

QRhiRenderTarget::Type QGles2ReferenceRenderTarget::type() const
{
    return RtRef;
}

QSize QGles2ReferenceRenderTarget::sizeInPixels() const
{
    return d.pixelSize;
}

QGles2TextureRenderTarget::QGles2TextureRenderTarget(QRhiImplementation *rhi,
                                                     const QRhiTextureRenderTargetDescription &desc,
                                                     Flags flags)
    : QRhiTextureRenderTarget(rhi, desc, flags),
      d(rhi)
{
}

void QGles2TextureRenderTarget::release()
{
    if (!framebuffer)
        return;

    QRhiGles2::DeferredReleaseEntry e;
    e.type = QRhiGles2::DeferredReleaseEntry::TextureRenderTarget;

    e.textureRenderTarget.framebuffer = framebuffer;

    framebuffer = 0;

    QRHI_RES_RHI(QRhiGles2);
    rhiD->releaseQueue.append(e);
}

1292
QRhiRenderPassDescriptor *QGles2TextureRenderTarget::newCompatibleRenderPassDescriptor()
Laszlo Agocs's avatar
Laszlo Agocs committed
1293
{
1294
    return new QGles2RenderPassDescriptor(rhi);
Laszlo Agocs's avatar
Laszlo Agocs committed
1295 1296
}

1297 1298 1299 1300 1301 1302 1303
bool QGles2TextureRenderTarget::build()
{
    QRHI_RES_RHI(QRhiGles2);

    if (framebuffer)
        release();

Laszlo Agocs's avatar
Laszlo Agocs committed
1304 1305
    Q_ASSERT(!m_desc.colorAttachments.isEmpty());
    Q_ASSERT(!m_desc.depthStencilBuffer || !m_desc.depthTexture);
1306

Laszlo Agocs's avatar
Laszlo Agocs committed
1307
    if (m_desc.colorAttachments.count() > 1)
1308
        qWarning("QGles2TextureRenderTarget: Multiple color attachments are not supported");
Laszlo Agocs's avatar
Laszlo Agocs committed
1309
    if (m_desc.depthTexture)
1310 1311 1312 1313 1314 1315 1316
        qWarning("QGles2TextureRenderTarget: Depth texture is not supported and will be ignored");

    rhiD->ensureContext();

    rhiD->f->glGenFramebuffers(1, &framebuffer);
    rhiD->f->glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);

Laszlo Agocs's avatar
Laszlo Agocs committed
1317
    QRhiTexture *texture = m_desc.colorAttachments.first().texture;
1318 1319 1320 1321 1322
    Q_ASSERT(texture);
    QGles2Texture *texD = QRHI_RES(QGles2Texture, texture);
    Q_ASSERT(texD->texture);

    rhiD->f->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, texD->target, texD->texture, 0);
Laszlo Agocs's avatar
Laszlo Agocs committed
1323

1324
    d.rp = QRHI_RES(QGles2RenderPassDescriptor, m_renderPassDesc);
Laszlo Agocs's avatar
Laszlo Agocs committed
1325
    d.pixelSize = texD->pixelSize();
1326 1327
    d.attCount = 1;

Laszlo Agocs's avatar
Laszlo Agocs committed
1328 1329
    if (m_desc.depthStencilBuffer) {
        QGles2RenderBuffer *rbD = QRHI_RES(QGles2RenderBuffer, m_desc.depthStencilBuffer);
1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401
        rhiD->f->glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rbD->renderbuffer);
        rhiD->f->glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, rbD->renderbuffer);
        d.attCount += 1;
    }

    GLenum status = rhiD->f->glCheckFramebufferStatus(GL_FRAMEBUFFER);
    if (status != GL_NO_ERROR && status != GL_FRAMEBUFFER_COMPLETE) {
        qWarning("Framebuffer incomplete: 0x%x", status);
        return false;
    }

    return true;
}

QRhiRenderTarget::Type QGles2TextureRenderTarget::type() const
{
    return RtTexture;
}

QSize QGles2TextureRenderTarget::sizeInPixels() const
{
    return d.pixelSize;
}

QGles2ShaderResourceBindings::QGles2ShaderResourceBindings(QRhiImplementation *rhi)
    : QRhiShaderResourceBindings(rhi)
{
}

void QGles2ShaderResourceBindings::release()
{
    // nothing to do here
}

bool QGles2ShaderResourceBindings::build()
{
    generation += 1;
    return true;
}

QGles2GraphicsPipeline::QGles2GraphicsPipeline(QRhiImplementation *rhi)
    : QRhiGraphicsPipeline(rhi)
{
}

void QGles2GraphicsPipeline::release()
{
    if (!program)
        return;

    QRhiGles2::DeferredReleaseEntry e;
    e.type = QRhiGles2::DeferredReleaseEntry::Pipeline;

    e.pipeline.program = program;

    program = 0;
    uniforms.clear();
    samplers.clear();

    QRHI_RES_RHI(QRhiGles2);
    rhiD->releaseQueue.append(e);
}

bool QGles2GraphicsPipeline::build()
{
    QRHI_RES_RHI(QRhiGles2);

    if (program)
        release();

    rhiD->ensureContext();

Laszlo Agocs's avatar
Laszlo Agocs committed
1402
    drawMode = toGlTopology(m_topology);
1403 1404 1405

    program = rhiD->f->glCreateProgram();

Laszlo Agocs's avatar
Laszlo Agocs committed
1406
    for (const QRhiGraphicsShaderStage &shaderStage : qAsConst(m_shaderStages)) {
1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 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 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547
        const bool isVertex = shaderStage.type == QRhiGraphicsShaderStage::Vertex;
        const bool isFragment = shaderStage.type == QRhiGraphicsShaderStage::Fragment;
        if (!isVertex && !isFragment)
            continue;

        GLuint shader = rhiD->f->glCreateShader(isVertex ? GL_VERTEX_SHADER : GL_FRAGMENT_SHADER);
        QBakedShader::ShaderSourceVersion ver;
        if (rhiD->ctx->isOpenGLES())
            ver = { 100, QBakedShader::ShaderSourceVersion::GlslEs };
        else
            ver = { 120 };
        const QByteArray source = shaderStage.shader.shader({ QBakedShader::GlslShader, ver }).shader;
        if (source.isEmpty()) {
            qWarning() << "No GLSL" << ver.version << "shader code found in baked shader" << shaderStage.shader;
            return false;
        }
        const char *srcStr = source.constData();
        const GLint srcLength = source.count();
        rhiD->f->glShaderSource(shader, 1, &srcStr, &srcLength);
        rhiD->f->glCompileShader(shader);
        GLint compiled = 0;
        rhiD->f->glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
        if (!compiled) {
            GLint infoLogLength = 0;
            rhiD->f->glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLogLength);
            QByteArray log;
            if (infoLogLength > 1) {
                GLsizei length = 0;
                log.resize(infoLogLength);
                rhiD->f->glGetShaderInfoLog(shader, infoLogLength, &length, log.data());
            }
            qWarning("Failed to compile shader: %s\nSource was:\n%s", log.constData(), source.constData());
            return false;
        }

        rhiD->f->glAttachShader(program, shader);
        rhiD->f->glDeleteShader(shader);

        if (isVertex)
            vsDesc = shaderStage.shader.description();
        else
            fsDesc = shaderStage.shader.description();
    }

    for (auto inVar : vsDesc.inputVariables()) {
        const QByteArray name = inVar.name.toUtf8();
        rhiD->f->glBindAttribLocation(program, inVar.location, name.constData());
    }

    rhiD->f->glLinkProgram(program);
    GLint linked = 0;
    rhiD->f->glGetProgramiv(program, GL_LINK_STATUS, &linked);
    if (!linked) {
        GLint infoLogLength = 0;
        rhiD->f->glGetProgramiv(program, GL_INFO_LOG_LENGTH, &infoLogLength);
        QByteArray log;
        if (infoLogLength > 1) {
            GLsizei length = 0;
            log.resize(infoLogLength);
            rhiD->f->glGetProgramInfoLog(program, infoLogLength, &length, log.data());
        }
        qWarning("Failed to link shader program: %s", log.constData());
        return false;
    }

    auto lookupUniforms = [this, rhiD](const QShaderDescription::UniformBlock &ub) {
        const QByteArray prefix = ub.structName.toUtf8() + '.';
        for (const QShaderDescription::BlockVariable &blockMember : ub.members) {
            // ### no array support for now
            Uniform uniform;
            uniform.type = blockMember.type;
            const QByteArray name = prefix + blockMember.name.toUtf8();
            uniform.glslLocation = rhiD->f->glGetUniformLocation(program, name.constData());
            if (uniform.glslLocation >= 0) {
                uniform.binding = ub.binding;
                uniform.offset = blockMember.offset;
                uniform.data.resize(blockMember.size);
                uniforms.append(uniform);
            }
        }
    };

    for (const QShaderDescription::UniformBlock &ub : vsDesc.uniformBlocks())
        lookupUniforms(ub);

    for (const QShaderDescription::UniformBlock &ub : fsDesc.uniformBlocks())
        lookupUniforms(ub);

    auto lookupSamplers = [this, rhiD](const QShaderDescription::InOutVariable &v) {
        Sampler sampler;
        const QByteArray name = v.name.toUtf8();
        sampler.glslLocation = rhiD->f->glGetUniformLocation(program, name.constData());
        if (sampler.glslLocation >= 0) {
            sampler.binding = v.binding;
            samplers.append(sampler);
        }
    };

    for (const QShaderDescription::InOutVariable &v : vsDesc.combinedImageSamplers())
        lookupSamplers(v);

    for (const QShaderDescription::InOutVariable &v : fsDesc.combinedImageSamplers())
        lookupSamplers(v);

    generation += 1;
    return true;
}

QGles2CommandBuffer::QGles2CommandBuffer(QRhiImplementation *rhi)
    : QRhiCommandBuffer(rhi)
{
    resetState();
}

void QGles2CommandBuffer::release()
{
    Q_UNREACHABLE();
}

QGles2SwapChain::QGles2SwapChain(QRhiImplementation *rhi)
    : QRhiSwapChain(rhi),
      rt(rhi),
      cb(rhi)
{
}

void QGles2SwapChain::release()
{
    // nothing to do here
}

QRhiCommandBuffer *QGles2SwapChain::currentFrameCommandBuffer()
{
    return &cb;
}

QRhiRenderTarget *QGles2SwapChain::currentFrameRenderTarget()
{
    return &rt;
}

1548
QSize QGles2SwapChain::effectivePixelSize() const
1549 1550 1551 1552
{
    return pixelSize;
}

1553
QRhiRenderPassDescriptor *QGles2SwapChain::newCompatibleRenderPassDescriptor()
1554
{
1555
    return new QGles2RenderPassDescriptor(rhi);
1556 1557
}

Laszlo Agocs's avatar
Laszlo Agocs committed
1558
bool QGles2SwapChain::buildOrResize()
1559
{
Laszlo Agocs's avatar
Laszlo Agocs committed
1560 1561
    surface = m_window;
    pixelSize = m_requestedPixelSize;
1562

1563
    rt.d.rp = QRHI_RES(QGles2RenderPassDescriptor, m_renderPassDesc);
1564
    rt.d.pixelSize = pixelSize;
Laszlo Agocs's avatar
Laszlo Agocs committed
1565
    rt.d.attCount = m_depthStencil ? 2 : 1;
1566 1567 1568 1569 1570

    return true;
}

QT_END_NAMESPACE