C++ GrPipelineBuilder类代码示例

void GrPipeline::adjustProgramFromOptimizations(const GrPipelineBuilder& pipelineBuilder,
                                                GrXferProcessor::OptFlags flags,
                                                const GrProcOptInfo& colorPOI,
                                                const GrProcOptInfo& coveragePOI,
                                                int* firstColorStageIdx,
                                                int* firstCoverageStageIdx) {
    fReadsFragPosition = fXferProcessor->willReadFragmentPosition();

    if ((flags & GrXferProcessor::kIgnoreColor_OptFlag) ||
        (flags & GrXferProcessor::kOverrideColor_OptFlag)) {
        *firstColorStageIdx = pipelineBuilder.numColorFragmentStages();
    } else {
        if (coveragePOI.readsFragPosition()) {
            fReadsFragPosition = true;
        }
    }

    if (flags & GrXferProcessor::kIgnoreCoverage_OptFlag) {
        *firstCoverageStageIdx = pipelineBuilder.numCoverageFragmentStages();
    } else {
        if (coveragePOI.readsFragPosition()) {
            fReadsFragPosition = true;
        }
    }
}

void GrDrawTarget::stencilPath(const GrPipelineBuilder& pipelineBuilder,
                               const SkMatrix& viewMatrix,
                               const GrPath* path,
                               GrPathRendering::FillType fill) {
    // TODO: extract portions of checkDraw that are relevant to path stenciling.
    SkASSERT(path);
    SkASSERT(this->caps()->shaderCaps()->pathRenderingSupport());

    // Setup clip
    GrPipelineBuilder::AutoRestoreStencil ars;
    GrAppliedClip clip;
    if (!fClipMaskManager->setupClipping(pipelineBuilder, &ars, nullptr, &clip)) {
        return;
    }

    GrPipelineBuilder::AutoRestoreFragmentProcessorState arfps;
    if (clip.clipCoverageFragmentProcessor()) {
        arfps.set(&pipelineBuilder);
        arfps.addCoverageFragmentProcessor(clip.clipCoverageFragmentProcessor());
    }

    // set stencil settings for path
    GrStencilSettings stencilSettings;
    GrRenderTarget* rt = pipelineBuilder.getRenderTarget();
    GrStencilAttachment* sb = fResourceProvider->attachStencilAttachment(rt);
    this->getPathStencilSettingsForFilltype(fill, sb, &stencilSettings);

    GrBatch* batch = GrStencilPathBatch::Create(viewMatrix,
                                                pipelineBuilder.isHWAntialias(),
                                                stencilSettings, clip.scissorState(),
                                                pipelineBuilder.getRenderTarget(),
                                                path);
    this->recordBatch(batch);
    batch->unref();
}

void GrDrawTarget::clear(const SkIRect* rect,
                         GrColor color,
                         bool canIgnoreRect,
                         GrRenderTarget* renderTarget) {
    SkIRect rtRect = SkIRect::MakeWH(renderTarget->width(), renderTarget->height());
    SkIRect clippedRect;
    if (!rect ||
        (canIgnoreRect && this->caps()->fullClearIsFree()) ||
        rect->contains(rtRect)) {
        rect = &rtRect;
    } else {
        clippedRect = *rect;
        if (!clippedRect.intersect(rtRect)) {
            return;
        }
        rect = &clippedRect;
    }

    if (fCaps->useDrawInsteadOfClear()) {
        // This works around a driver bug with clear by drawing a rect instead.
        // The driver will ignore a clear if it is the only thing rendered to a
        // target before the target is read.
        if (rect == &rtRect) {
            this->discard(renderTarget);
        }

        GrPipelineBuilder pipelineBuilder;
        pipelineBuilder.setRenderTarget(renderTarget);

        this->drawSimpleRect(pipelineBuilder, color, SkMatrix::I(), *rect);
    } else {       
        this->onClear(*rect, color, renderTarget);
    }
}

void GrDistanceFieldTextContext::flush() {
    if (NULL == fDrawTarget) {
        return;
    }

    if (fCurrVertex > 0) {
        GrPipelineBuilder pipelineBuilder;
        pipelineBuilder.setFromPaint(fPaint, fRenderTarget, fClip);

        // setup our sampler state for our text texture/atlas
        SkASSERT(SkIsAlign4(fCurrVertex));

        // get our current color
        SkColor filteredColor;
        SkColorFilter* colorFilter = fSkPaint.getColorFilter();
        if (colorFilter) {
            filteredColor = colorFilter->filterColor(fSkPaint.getColor());
        } else {
            filteredColor = fSkPaint.getColor();
        }
        this->setupCoverageEffect(filteredColor);

        // Set draw state
        if (fUseLCDText) {
            // TODO: move supportsRGBCoverage check to setupCoverageEffect and only add LCD
            // processor if the xp can support it. For now we will simply assume that if
            // fUseLCDText is true, then we have a known color output.
            const GrXPFactory* xpFactory = pipelineBuilder.getXPFactory();
            if (!xpFactory->supportsRGBCoverage(0, kRGBA_GrColorComponentFlags)) {
                SkDebugf("LCD Text will not draw correctly.\n");
            }
            SkASSERT(!fCachedGeometryProcessor->hasVertexColor());
        } else {
            // We're using per-vertex color.
            SkASSERT(fCachedGeometryProcessor->hasVertexColor());
        }
        int nGlyphs = fCurrVertex / kVerticesPerGlyph;
        fDrawTarget->setIndexSourceToBuffer(fContext->getQuadIndexBuffer());
        fDrawTarget->drawIndexedInstances(&pipelineBuilder,
                                          fCachedGeometryProcessor.get(),
                                          kTriangles_GrPrimitiveType,
                                          nGlyphs,
                                          kVerticesPerGlyph,
                                          kIndicesPerGlyph,
                                          &fVertexBounds);
        fDrawTarget->resetVertexSource();
        fVertices = NULL;
        fTotalVertexCount -= fCurrVertex;
        fCurrVertex = 0;
        SkSafeSetNull(fCurrTexture);
        fVertexBounds.setLargestInverted();
    }
}

DEF_GPUTEST_FOR_ALL_GL_CONTEXTS(VertexAttributeCount, reporter, ctxInfo) {
    GrContext* context = ctxInfo.fGrContext;
    GrTextureDesc desc;
    desc.fHeight = 1;
    desc.fWidth = 1;
    desc.fFlags = kRenderTarget_GrSurfaceFlag;
    desc.fConfig = kRGBA_8888_GrPixelConfig;
    SkAutoTUnref<GrTexture> target(context->textureProvider()->createTexture(desc,
                                                                             SkBudgeted::kYes));
    if (!target) {
        ERRORF(reporter, "Could not create render target.");
        return;
    }
    SkAutoTUnref<GrDrawContext> dc(context->drawContext(target->asRenderTarget()));
    if (!dc) {
        ERRORF(reporter, "Could not create draw context.");
        return;
    }
    int attribCnt = context->caps()->maxVertexAttributes();
    if (!attribCnt) {
        ERRORF(reporter, "No attributes allowed?!");
        return;
    }
    context->flush();
    context->resetGpuStats();
#if GR_GPU_STATS
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numDraws() == 0);
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numFailedDraws() == 0);
#endif
    SkAutoTUnref<GrDrawBatch> batch;
    GrPipelineBuilder pb;
    pb.setRenderTarget(target->asRenderTarget());
    // This one should succeed.
    batch.reset(new Batch(attribCnt));
    dc->drawContextPriv().testingOnly_drawBatch(pb, batch);
    context->flush();
#if GR_GPU_STATS
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numDraws() == 1);
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numFailedDraws() == 0);
#endif
    context->resetGpuStats();
    // This one should fail.
    batch.reset(new Batch(attribCnt+1));
    dc->drawContextPriv().testingOnly_drawBatch(pb, batch);
    context->flush();
#if GR_GPU_STATS
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numDraws() == 0);
    REPORTER_ASSERT(reporter, context->getGpu()->stats()->numFailedDraws() == 1);
#endif
}

bool GrDrawTarget::setupDstReadIfNecessary(const GrPipelineBuilder& pipelineBuilder,
                                           const GrProcOptInfo& colorPOI,
                                           const GrProcOptInfo& coveragePOI,
                                           GrDeviceCoordTexture* dstCopy,
                                           const SkRect* drawBounds) {
    if (!pipelineBuilder.willXPNeedDstCopy(*this->caps(), colorPOI, coveragePOI)) {
        return true;
    }
    SkIRect copyRect;
    GrRenderTarget* rt = pipelineBuilder.getRenderTarget();
    pipelineBuilder.clip().getConservativeBounds(rt, &copyRect);

    if (drawBounds) {
        SkIRect drawIBounds;
        drawBounds->roundOut(&drawIBounds);
        if (!copyRect.intersect(drawIBounds)) {
#ifdef SK_DEBUG
            SkDebugf("Missed an early reject. Bailing on draw from setupDstReadIfNecessary.\n");
#endif
            return false;
        }
    } else {
#ifdef SK_DEBUG
        //SkDebugf("No dev bounds when dst copy is made.\n");
#endif
    }

    // MSAA consideration: When there is support for reading MSAA samples in the shader we could
    // have per-sample dst values by making the copy multisampled.
    GrSurfaceDesc desc;
    this->initCopySurfaceDstDesc(rt, &desc);
    desc.fWidth = copyRect.width();
    desc.fHeight = copyRect.height();

    SkAutoTUnref<GrTexture> copy(
        fContext->refScratchTexture(desc, GrContext::kApprox_ScratchTexMatch));

    if (!copy) {
        SkDebugf("Failed to create temporary copy of destination texture.\n");
        return false;
    }
    SkIPoint dstPoint = {0, 0};
    if (this->copySurface(copy, rt, copyRect, dstPoint)) {
        dstCopy->setTexture(copy);
        dstCopy->setOffset(copyRect.fLeft, copyRect.fTop);
        return true;
    } else {
        return false;
    }
}

/*
 * This method traverses the clip stack to see if the GrSoftwarePathRenderer
 * will be used on any element. If so, it returns true to indicate that the
 * entire clip should be rendered in SW and then uploaded en masse to the gpu.
 */
bool GrClipMaskManager::UseSWOnlyPath(GrContext* context,
                                      const GrPipelineBuilder& pipelineBuilder,
                                      const GrDrawContext* drawContext,
                                      const SkVector& clipToMaskOffset,
                                      const GrReducedClip::ElementList& elements) {
    // TODO: generalize this function so that when
    // a clip gets complex enough it can just be done in SW regardless
    // of whether it would invoke the GrSoftwarePathRenderer.

    // Set the matrix so that rendered clip elements are transformed to mask space from clip
    // space.
    const SkMatrix translate = SkMatrix::MakeTrans(clipToMaskOffset.fX, clipToMaskOffset.fY);

    for (GrReducedClip::ElementList::Iter iter(elements.headIter()); iter.get(); iter.next()) {
        const Element* element = iter.get();

        SkRegion::Op op = element->getOp();
        bool invert = element->isInverseFilled();
        bool needsStencil = invert ||
                            SkRegion::kIntersect_Op == op || SkRegion::kReverseDifference_Op == op;

        if (PathNeedsSWRenderer(context, pipelineBuilder.hasUserStencilSettings(),
                                drawContext, translate, element, nullptr, needsStencil)) {
            return true;
        }
    }
    return false;
}

bool GrClipMaskManager::setupScissorClip(const GrPipelineBuilder& pipelineBuilder,
                                         GrPipelineBuilder::AutoRestoreStencil* ars,
                                         const SkIRect& clipScissor,
                                         const SkRect* devBounds,
                                         GrAppliedClip* out) {
    if (kRespectClip_StencilClipMode == fClipMode) {
        fClipMode = kIgnoreClip_StencilClipMode;
    }

    GrRenderTarget* rt = pipelineBuilder.getRenderTarget();

    SkIRect clipSpaceRTIBounds = SkIRect::MakeWH(rt->width(), rt->height());
    SkIRect devBoundsScissor;
    const SkIRect* scissor = &clipScissor;
    bool doDevBoundsClip = fDebugClipBatchToBounds && devBounds;
    if (doDevBoundsClip) {
        devBounds->roundOut(&devBoundsScissor);
        if (devBoundsScissor.intersect(clipScissor)) {
            scissor = &devBoundsScissor;
        }
    }

    if (scissor->contains(clipSpaceRTIBounds)) {
        // This counts as wide open
        this->setPipelineBuilderStencil(pipelineBuilder, ars);
        return true;
    }

    if (clipSpaceRTIBounds.intersect(*scissor)) {
        out->fScissorState.set(clipSpaceRTIBounds);
        this->setPipelineBuilderStencil(pipelineBuilder, ars);
        return true;
    }
    return false;
}

void GrDrawTarget::drawPath(const GrPipelineBuilder& pipelineBuilder,
                            const GrPathProcessor* pathProc,
                            const GrPath* path,
                            GrPathRendering::FillType fill) {
    // TODO: extract portions of checkDraw that are relevant to path rendering.
    SkASSERT(path);
    SkASSERT(this->caps()->shaderCaps()->pathRenderingSupport());

    SkRect devBounds = path->getBounds();
    pathProc->viewMatrix().mapRect(&devBounds);

    // Setup clip
    GrScissorState scissorState;
    GrPipelineBuilder::AutoRestoreFragmentProcessorState arfps;
    GrPipelineBuilder::AutoRestoreStencil ars;
    if (!this->setupClip(pipelineBuilder, &arfps, &ars, &scissorState, &devBounds)) {
       return;
    }

    // set stencil settings for path
    GrStencilSettings stencilSettings;
    GrRenderTarget* rt = pipelineBuilder.getRenderTarget();
    GrStencilAttachment* sb = rt->renderTargetPriv().attachStencilAttachment();
    this->getPathStencilSettingsForFilltype(fill, sb, &stencilSettings);

    GrDrawTarget::PipelineInfo pipelineInfo(pipelineBuilder, &scissorState, pathProc, &devBounds,
                                            this);
    if (pipelineInfo.mustSkipDraw()) {
        return;
    }

    this->onDrawPath(pathProc, path, stencilSettings, pipelineInfo);
}

void GrPipeline::adjustProgramFromOptimizations(const GrPipelineBuilder& pipelineBuilder,
                                                GrXferProcessor::OptFlags flags,
                                                const GrProcOptInfo& colorPOI,
                                                const GrProcOptInfo& coveragePOI,
                                                int* firstColorProcessorIdx,
                                                int* firstCoverageProcessorIdx) {
    fIgnoresCoverage = SkToBool(flags & GrXferProcessor::kIgnoreCoverage_OptFlag);

    if ((flags & GrXferProcessor::kIgnoreColor_OptFlag) ||
        (flags & GrXferProcessor::kOverrideColor_OptFlag)) {
        *firstColorProcessorIdx = pipelineBuilder.numColorFragmentProcessors();
    }

    if (flags & GrXferProcessor::kIgnoreCoverage_OptFlag) {
        *firstCoverageProcessorIdx = pipelineBuilder.numCoverageFragmentProcessors();
    }
}

static void test_path(GrDrawTarget* dt, GrRenderTarget* rt, GrResourceProvider* rp,
                      const SkPath& path) {
    GrTessellatingPathRenderer tess;
    GrPipelineBuilder pipelineBuilder;
    pipelineBuilder.setRenderTarget(rt);
    GrStrokeInfo stroke(SkStrokeRec::kFill_InitStyle);
    GrPathRenderer::DrawPathArgs args;
    args.fTarget = dt;
    args.fPipelineBuilder = &pipelineBuilder;
    args.fResourceProvider = rp;
    args.fColor = GrColor_WHITE;
    args.fViewMatrix = &SkMatrix::I();
    args.fPath = &path;
    args.fStroke = &stroke;
    args.fAntiAlias = false;
    tess.drawPath(args);
}

bool GrDrawTarget::copySurface(GrSurface* dst,
                               GrSurface* src,
                               const SkIRect& srcRect,
                               const SkIPoint& dstPoint) {
    SkASSERT(dst);
    SkASSERT(src);

    SkIRect clippedSrcRect;
    SkIPoint clippedDstPoint;
    // If the rect is outside the src or dst then we've already succeeded.
    if (!clip_srcrect_and_dstpoint(dst,
                                   src,
                                   srcRect,
                                   dstPoint,
                                   &clippedSrcRect,
                                   &clippedDstPoint)) {
        return true;
    }

    if (this->onCopySurface(dst, src, clippedSrcRect, clippedDstPoint)) {
        return true;
    }

    GrRenderTarget* rt = dst->asRenderTarget();
    GrTexture* tex = src->asTexture();

    if ((dst == src) || !rt || !tex) {
        return false;
    }

    GrPipelineBuilder pipelineBuilder;
    pipelineBuilder.setRenderTarget(rt);
    SkMatrix matrix;
    matrix.setTranslate(SkIntToScalar(clippedSrcRect.fLeft - clippedDstPoint.fX),
                        SkIntToScalar(clippedSrcRect.fTop - clippedDstPoint.fY));
    matrix.postIDiv(tex->width(), tex->height());
    pipelineBuilder.addColorTextureProcessor(tex, matrix);
    SkIRect dstRect = SkIRect::MakeXYWH(clippedDstPoint.fX,
                                        clippedDstPoint.fY,
                                        clippedSrcRect.width(),
                                        clippedSrcRect.height());
    this->drawSimpleRect(&pipelineBuilder, GrColor_WHITE, SkMatrix::I(), dstRect);
    return true;
}

void GrDrawTarget::clear(const SkIRect* rect,
                         GrColor color,
                         bool canIgnoreRect,
                         GrRenderTarget* renderTarget) {
    SkIRect rtRect = SkIRect::MakeWH(renderTarget->width(), renderTarget->height());
    SkIRect clippedRect;
    if (!rect ||
        (canIgnoreRect && this->caps()->fullClearIsFree()) ||
        rect->contains(rtRect)) {
        rect = &rtRect;
    } else {
        clippedRect = *rect;
        if (!clippedRect.intersect(rtRect)) {
            return;
        }
        rect = &clippedRect;
    }

    if (this->caps()->useDrawInsteadOfClear()) {
        // This works around a driver bug with clear by drawing a rect instead.
        // The driver will ignore a clear if it is the only thing rendered to a
        // target before the target is read.
        if (rect == &rtRect) {
            this->discard(renderTarget);
        }

        GrPipelineBuilder pipelineBuilder;
        pipelineBuilder.setXPFactory(
            GrPorterDuffXPFactory::Create(SkXfermode::kSrc_Mode))->unref();
        pipelineBuilder.setRenderTarget(renderTarget);

        SkRect scalarRect = SkRect::Make(*rect);
        SkAutoTUnref<GrDrawBatch> batch(
                GrRectBatchFactory::CreateNonAAFill(color, SkMatrix::I(), scalarRect,
                                                    nullptr, nullptr));
        this->drawBatch(pipelineBuilder, batch);
    } else {
        GrBatch* batch = new GrClearBatch(*rect, color, renderTarget);
        this->recordBatch(batch);
        batch->unref();
    }
}

static void test_path(GrDrawTarget* dt, GrDrawContext* drawContext,
                      GrResourceProvider* rp, const SkPath& path) {
    GrTessellatingPathRenderer tess;
    GrPipelineBuilder pipelineBuilder;
    pipelineBuilder.setXPFactory(
        GrPorterDuffXPFactory::Create(SkXfermode::kSrc_Mode))->unref();
    pipelineBuilder.setRenderTarget(drawContext->accessRenderTarget());
    GrNoClip noClip;
    GrStyle style(SkStrokeRec::kFill_InitStyle);
    GrPathRenderer::DrawPathArgs args;
    args.fTarget = dt;
    args.fPipelineBuilder = &pipelineBuilder;
    args.fClip = &noClip;
    args.fResourceProvider = rp;
    args.fColor = GrColor_WHITE;
    args.fViewMatrix = &SkMatrix::I();
    args.fPath = &path;
    args.fStyle = &style;
    args.fAntiAlias = false;
    tess.drawPath(args);
}

void GrDrawTarget::stencilPath(const GrPipelineBuilder& pipelineBuilder,
                               GrDrawContext* drawContext,
                               const GrClip& clip,
                               const SkMatrix& viewMatrix,
                               const GrPath* path,
                               GrPathRendering::FillType fill) {
    // TODO: extract portions of checkDraw that are relevant to path stenciling.
    SkASSERT(path);
    SkASSERT(this->caps()->shaderCaps()->pathRenderingSupport());

    // Setup clip
    GrAppliedClip appliedClip;
    if (!clip.apply(fContext, pipelineBuilder, drawContext, nullptr, &appliedClip)) {
        return;
    }
    // TODO: respect fClipBatchToBounds if we ever start computing bounds here.

    // Coverage AA does not make sense when rendering to the stencil buffer. The caller should never
    // attempt this in a situation that would require coverage AA.
    SkASSERT(!appliedClip.clipCoverageFragmentProcessor());

    GrRenderTarget* rt = pipelineBuilder.getRenderTarget();
    GrStencilAttachment* stencilAttachment = fResourceProvider->attachStencilAttachment(rt);
    if (!stencilAttachment) {
        SkDebugf("ERROR creating stencil attachment. Draw skipped.\n");
        return;
    }

    GrBatch* batch = GrStencilPathBatch::Create(viewMatrix,
                                                pipelineBuilder.isHWAntialias(),
                                                fill,
                                                appliedClip.hasStencilClip(),
                                                stencilAttachment->bits(),
                                                appliedClip.scissorState(),
                                                pipelineBuilder.getRenderTarget(),
                                                path);
    this->recordBatch(batch);
    batch->unref();
}