qrhigles2.cpp 56.1 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
/****************************************************************************
**
** 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)
59
    : ofr(this)
60 61 62 63 64 65 66 67 68 69 70 71 72 73
{
    QRhiGles2InitParams *glparams = static_cast<QRhiGles2InitParams *>(params);
    ctx = glparams->context;
    maybeWindow = glparams->window; // may be null
    fallbackSurface = glparams->fallbackSurface;

    create();
}

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

74
bool QRhiGles2::ensureContext(QSurface *surface)
75 76 77 78 79 80 81 82 83 84 85 86 87
{
    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))
88
        return true;
89

90
    if (!ctx->makeCurrent(surface)) {
91
        qWarning("QRhiGles2: Failed to make context current. Expect bad things to happen.");
92 93 94 95
        return false;
    }

    return true;
96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185
}

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
}

186
bool QRhiGles2::isTextureFormatSupported(QRhiTexture::Format format, QRhiTexture::Flags flags) const
187
{
188 189
    Q_UNUSED(flags);

190 191 192 193 194 195
    if (format >= QRhiTexture::BC1 && format <= QRhiTexture::BC7)
        return false;

    return true;
}

196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233
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
234
    QGles2GraphicsPipeline *psD = QRHI_RES(QGles2GraphicsPipeline, ps);
235
    if (!srb)
Laszlo Agocs's avatar
Laszlo Agocs committed
236
        srb = psD->m_shaderResourceBindings;
237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268

    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
269
        Q_ASSERT(bufD->m_usage.testFlag(QRhiBuffer::VertexBuffer));
270 271 272 273 274 275 276 277 278 279 280
        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
281
        Q_ASSERT(ibufD->m_usage.testFlag(QRhiBuffer::IndexBuffer));
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
        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);
379 380 381
    if (!ensureContext(swapChainD->surface))
        return QRhi::FrameOpError;

382
    inFrame = true;
383
    currentSwapChain = swapChainD;
384 385 386 387 388 389 390 391 392 393

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

    return QRhi::FrameOpSuccess;
}

QRhi::FrameOpResult QRhiGles2::endFrame(QRhiSwapChain *swapChain)
{
    Q_ASSERT(inFrame);
394
    inFrame = false;
395 396

    QGles2SwapChain *swapChainD = QRHI_RES(QGles2SwapChain, swapChain);
397 398 399
    if (!ensureContext(swapChainD->surface))
        return QRhi::FrameOpError;

400 401
    executeCommandBuffer(&swapChainD->cb);

402
    currentSwapChain = nullptr;
403 404 405 406 407 408 409 410 411 412
    ++finishedFrameCount;

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

    return QRhi::FrameOpSuccess;
}

413 414
QRhi::FrameOpResult QRhiGles2::beginOffscreenFrame(QRhiCommandBuffer **cb)
{
415 416 417 418 419 420 421 422 423 424 425 426 427
    Q_ASSERT(!inFrame);

    if (!ensureContext())
        return QRhi::FrameOpError;

    inFrame = true;
    ofr.active = true;

    executeDeferredReleases();
    ofr.cbWrapper.resetState();
    *cb = &ofr.cbWrapper;

    return QRhi::FrameOpSuccess;
428 429
}

430
QRhi::FrameOpResult QRhiGles2::endOffscreenFrame()
431
{
432 433 434 435 436 437 438 439 440 441 442
    Q_ASSERT(inFrame && ofr.active);
    inFrame = false;
    ofr.active = false;

    if (!ensureContext())
        return QRhi::FrameOpError;

    executeCommandBuffer(&ofr.cbWrapper);

    ++finishedFrameCount;
    return QRhi::FrameOpSuccess;;
443 444
}

445
bool QRhiGles2::readback(QRhiCommandBuffer *cb, const QRhiReadbackDescription &rb, QRhiReadbackResult *result)
446 447 448 449 450 451
{
    Q_UNUSED(cb);
    Q_UNUSED(rb);
    Q_UNUSED(result);

    Q_ASSERT(inFrame && !inPass);
452 453

    return false;
454 455 456 457 458
}

QRhi::FrameOpResult QRhiGles2::finish()
{
    Q_ASSERT(!inPass);
459 460 461 462 463 464 465 466 467 468 469 470 471 472 473
    if (inFrame) {
        if (ofr.active) {
            Q_ASSERT(!currentSwapChain);
            if (!ensureContext())
                return QRhi::FrameOpError;
            executeCommandBuffer(&ofr.cbWrapper);
            ofr.cbWrapper.resetCommands();
        } else {
            Q_ASSERT(currentSwapChain);
            if (!ensureContext(currentSwapChain->surface))
                return QRhi::FrameOpError;
            executeCommandBuffer(&currentSwapChain->cb);
            currentSwapChain->cb.resetCommands();
        }
    }
474 475 476
    return QRhi::FrameOpSuccess;
}

477 478 479 480 481 482
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
483 484
        Q_ASSERT(bufD->m_type == QRhiBuffer::Dynamic);
        if (bufD->m_usage.testFlag(QRhiBuffer::UniformBuffer)) {
485 486 487 488 489 490 491 492 493 494 495 496 497 498
            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
499 500 501
        Q_ASSERT(bufD->m_type != QRhiBuffer::Dynamic);
        Q_ASSERT(u.data.size() == bufD->m_size);
        if (bufD->m_usage.testFlag(QRhiBuffer::UniformBuffer)) {
502 503 504 505 506 507 508 509 510 511
            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
512
        const bool isCubeMap = texD->m_flags.testFlag(QRhiTexture::CubeMap);
513 514
        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
515
            const QRhiTextureUploadDescription::Layer &layerDesc(u.desc.layers[layer]);
516 517
            f->glBindTexture(targetBase + layer, texD->texture);
            for (int level = 0, levelCount = layerDesc.mipImages.count(); level != levelCount; ++level) {
Laszlo Agocs's avatar
Laszlo Agocs committed
518
                const QRhiTextureUploadDescription::Layer::MipLevel mipDesc(layerDesc.mipImages[level]);
519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763
                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
764 765 766 767
            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);
768 769 770 771 772 773 774
            } else {
                qWarning("No graphics pipeline active for setStencilRef; ignored");
            }
        }
            break;
        case QGles2CommandBuffer::Command::BindVertexBuffer:
        {
Laszlo Agocs's avatar
Laszlo Agocs committed
775 776 777
            QGles2GraphicsPipeline *psD = QRHI_RES(QGles2GraphicsPipeline, cmd.args.bindVertexBuffer.ps);
            if (psD) {
                for (const QRhiVertexInputLayout::Attribute &a : psD->m_vertexInputLayout.attributes) {
778 779 780 781 782 783
                    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
784
                    const int stride = psD->m_vertexInputLayout.bindings[a.binding].stride;
785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836
                    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
837 838 839
            QGles2GraphicsPipeline *psD = QRHI_RES(QGles2GraphicsPipeline, cmd.args.draw.ps);
            if (psD)
                f->glDrawArrays(psD->drawMode, cmd.args.draw.firstVertex, cmd.args.draw.vertexCount);
840 841 842 843 844 845
            else
                qWarning("No graphics pipeline active for draw; ignored");
        }
            break;
        case QGles2CommandBuffer::Command::DrawIndexed:
        {
Laszlo Agocs's avatar
Laszlo Agocs committed
846 847
            QGles2GraphicsPipeline *psD = QRHI_RES(QGles2GraphicsPipeline, cmd.args.drawIndexed.ps);
            if (psD) {
848
                quint32 ofs = cmd.args.drawIndexed.firstIndex * indexStride + indexOffset;
Laszlo Agocs's avatar
Laszlo Agocs committed
849
                f->glDrawElements(psD->drawMode,
850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901
                                  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
902
    if (psD->m_flags.testFlag(QRhiGraphicsPipeline::UsesScissor))
903 904 905
        f->glEnable(GL_SCISSOR_TEST);
    else
        f->glDisable(GL_SCISSOR_TEST);
Laszlo Agocs's avatar
Laszlo Agocs committed
906
    if (psD->m_cullMode == QRhiGraphicsPipeline::None) {
907 908 909
        f->glDisable(GL_CULL_FACE);
    } else {
        f->glEnable(GL_CULL_FACE);
Laszlo Agocs's avatar
Laszlo Agocs committed
910
        f->glCullFace(toGlCullMode(psD->m_cullMode));
911
    }
Laszlo Agocs's avatar
Laszlo Agocs committed
912 913 914
    f->glFrontFace(toGlFrontFace(psD->m_frontFace));
    if (!psD->m_targetBlends.isEmpty()) {
        const QRhiGraphicsPipeline::TargetBlend &blend(psD->m_targetBlends.first()); // no MRT
915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932
        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
933
    if (psD->m_depthTest)
934 935 936
        f->glEnable(GL_DEPTH_TEST);
    else
        f->glDisable(GL_DEPTH_TEST);
Laszlo Agocs's avatar
Laszlo Agocs committed
937
    if (psD->m_depthWrite)
938 939 940
        f->glDepthMask(GL_TRUE);
    else
        f->glDepthMask(GL_FALSE);
Laszlo Agocs's avatar
Laszlo Agocs committed
941 942
    f->glDepthFunc(toGlCompareOp(psD->m_depthOp));
    if (psD->m_stencilTest) {
943
        f->glEnable(GL_STENCIL_TEST);
Laszlo Agocs's avatar
Laszlo Agocs committed
944
        f->glStencilFuncSeparate(GL_FRONT, toGlCompareOp(psD->m_stencilFront.compareOp), 0, psD->m_stencilReadMask);
945
        f->glStencilOpSeparate(GL_FRONT,
Laszlo Agocs's avatar
Laszlo Agocs committed
946 947 948 949 950
                               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);
951
        f->glStencilOpSeparate(GL_BACK,
Laszlo Agocs's avatar
Laszlo Agocs committed
952 953 954 955
                               toGlStencilOp(psD->m_stencilBack.failOp),
                               toGlStencilOp(psD->m_stencilBack.depthFailOp),
                               toGlStencilOp(psD->m_stencilBack.passOp));
        f->glStencilMaskSeparate(GL_BACK, psD->m_stencilWriteMask);
956 957 958 959 960 961 962 963 964 965 966
    } 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
967 968 969
    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]);
970
        switch (b.type) {
Laszlo Agocs's avatar
Laszlo Agocs committed
971
        case QRhiShaderResourceBinding::UniformBuffer:
972 973 974 975 976
        {
            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
977
                                                               b.ubuf.maybeSize ? b.ubuf.maybeSize : bufD->m_size);
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 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
            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
1030
        case QRhiShaderResourceBinding::SampledTexture:
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 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087
        {
            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
1088
        needsColorClear = !rtTex->m_flags.testFlag(QRhiTextureRenderTarget::PreserveColorContents);
1089 1090 1091 1092 1093 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 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
        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
1155
    if (m_usage.testFlag(QRhiBuffer::UniformBuffer)) {
1156
        // special since we do not support uniform blocks in this backend
Laszlo Agocs's avatar
Laszlo Agocs committed
1157
        ubuf.resize(m_size);
1158 1159 1160
        return true;
    }

1161 1162
    if (!rhiD->ensureContext())
        return false;
1163

Laszlo Agocs's avatar
Laszlo Agocs committed
1164
    if (m_usage.testFlag(QRhiBuffer::VertexBuffer))
1165
        target = GL_ARRAY_BUFFER;
Laszlo Agocs's avatar
Laszlo Agocs committed
1166
    if (m_usage.testFlag(QRhiBuffer::IndexBuffer))
1167 1168 1169 1170
        target = GL_ELEMENT_ARRAY_BUFFER;

    rhiD->f->glGenBuffers(1, &buffer);
    rhiD->f->glBindBuffer(target, buffer);
Laszlo Agocs's avatar
Laszlo Agocs committed
1171
    rhiD->f->glBufferData(target, m_size, nullptr, m_type == Dynamic ? GL_DYNAMIC_DRAW : GL_STATIC_DRAW);
1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204

    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
1205
    if (m_hints.testFlag(ToBeUsedWithSwapChainOnly))
1206 1207
        return true;

1208 1209
    if (!rhiD->ensureContext())
        return false;
1210 1211 1212 1213

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

Laszlo Agocs's avatar
Laszlo Agocs committed
1214
    switch (m_type) {
1215
    case QRhiRenderBuffer::DepthStencil:
Laszlo Agocs's avatar
Laszlo Agocs committed
1216
        rhiD->f->glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, m_pixelSize.width(), m_pixelSize.height());
1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258
        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();

1259 1260
    if (!rhiD->ensureContext())
        return false;
1261

Laszlo Agocs's avatar
Laszlo Agocs committed
1262
    const QSize size = safeSize(m_pixelSize);
1263 1264
    // ### adjust size for npot when repeat with npot is not supported?

Laszlo Agocs's avatar
Laszlo Agocs committed
1265 1266
    const bool isCube = m_flags.testFlag(CubeMap);
    const bool hasMipMaps = m_flags.testFlag(MipMapped);
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281
    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,
1282
                                      qFloor(float(qMax(1, size.width() >> level))), qFloor(float(qMax(1, size.height() >> level))),
1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306
                                      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
1307 1308 1309 1310 1311
    glminfilter = toGlMinFilter(m_minFilter, m_mipmapMode);
    glmagfilter = toGlMagFilter(m_magFilter);
    glwraps = toGlWrapMode(m_addressU);
    glwrapt = toGlWrapMode(m_addressV);
    glwrapr = toGlWrapMode(m_addressW);
1312 1313 1314 1315

    return true;
}

Laszlo Agocs's avatar
Laszlo Agocs committed
1316
// dummy, no Vulkan-style RenderPass+Framebuffer concept here
1317 1318
QGles2RenderPassDescriptor::QGles2RenderPassDescriptor(QRhiImplementation *rhi)
    : QRhiRenderPassDescriptor(rhi)
1319 1320 1321
{
}

1322
void QGles2RenderPassDescriptor::release()
1323 1324 1325 1326 1327 1328 1329 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
{
    // 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);
}

1372
QRhiRenderPassDescriptor *QGles2TextureRenderTarget::newCompatibleRenderPassDescriptor()
Laszlo Agocs's avatar
Laszlo Agocs committed
1373
{
1374
    return new QGles2RenderPassDescriptor(rhi);
Laszlo Agocs's avatar
Laszlo Agocs committed
1375 1376
}

1377 1378 1379 1380 1381 1382 1383
bool QGles2TextureRenderTarget::build()
{
    QRHI_RES_RHI(QRhiGles2);

    if (framebuffer)
        release();

Laszlo Agocs's avatar
Laszlo Agocs committed
1384 1385
    Q_ASSERT(!m_desc.colorAttachments.isEmpty());
    Q_ASSERT(!m_desc.depthStencilBuffer || !m_desc.depthTexture);
1386

Laszlo Agocs's avatar
Laszlo Agocs committed
1387
    if (m_desc.colorAttachments.count() > 1)
1388
        qWarning("QGles2TextureRenderTarget: Multiple color attachments are not supported");
Laszlo Agocs's avatar
Laszlo Agocs committed
1389
    if (m_desc.depthTexture)
1390 1391
        qWarning("QGles2TextureRenderTarget: Depth texture is not supported and will be ignored");

1392 1393
    if (!rhiD->ensureContext())
        return false;
1394 1395 1396 1397

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

Laszlo Agocs's avatar
Laszlo Agocs committed
1398
    QRhiTexture *texture = m_desc.colorAttachments.first().texture;
1399 1400 1401 1402 1403
    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
1404

1405
    d.rp = QRHI_RES(QGles2RenderPassDescriptor, m_renderPassDesc);
Laszlo Agocs's avatar
Laszlo Agocs committed
1406
    d.pixelSize = texD->pixelSize();
1407 1408
    d.attCount = 1;

Laszlo Agocs's avatar
Laszlo Agocs committed
1409 1410
    if (m_desc.depthStencilBuffer) {
        QGles2RenderBuffer *rbD = QRHI_RES(QGles2RenderBuffer, m_desc.depthStencilBuffer);
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
        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();

1481 1482
    if (!rhiD->ensureContext())
        return false;
1483

Laszlo Agocs's avatar
Laszlo Agocs committed
1484
    drawMode = toGlTopology(m_topology);
1485 1486 1487

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

Laszlo Agocs's avatar
Laszlo Agocs committed
1488
    for (const QRhiGraphicsShaderStage &shaderStage : qAsConst(m_shaderStages)) {
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 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629
        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;
}

1630
QSize QGles2SwapChain::effectivePixelSize() const
1631 1632 1633 1634
{
    return pixelSize;
}

1635
QRhiRenderPassDescriptor *QGles2SwapChain::newCompatibleRenderPassDescriptor()
1636
{
1637
    return new QGles2RenderPassDescriptor(rhi);
1638 1639
}

Laszlo Agocs's avatar
Laszlo Agocs committed
1640
bool QGles2SwapChain::buildOrResize()
1641
{
Laszlo Agocs's avatar
Laszlo Agocs committed
1642 1643
    surface = m_window;
    pixelSize = m_requestedPixelSize;
1644

1645
    rt.d.rp = QRHI_RES(QGles2RenderPassDescriptor, m_renderPassDesc);
1646
    rt.d.pixelSize = pixelSize;
Laszlo Agocs's avatar
Laszlo Agocs committed
1647
    rt.d.attCount = m_depthStencil ? 2 : 1;
1648 1649 1650 1651 1652

    return true;
}

QT_END_NAMESPACE