C++ GrDrawState::preConcatSamplerMatrices方法代码示例

GrDrawTarget::AutoDeviceCoordDraw::AutoDeviceCoordDraw(
                                            GrDrawTarget* target,
                                            GrDrawState::StageMask stageMask) {
    GrAssert(NULL != target);
    GrDrawState* drawState = target->drawState();

    fDrawTarget = target;
    fViewMatrix = drawState->getViewMatrix();
    fStageMask = stageMask;
    if (fStageMask) {
        GrMatrix invVM;
        if (fViewMatrix.invert(&invVM)) {
            for (int s = 0; s < GrDrawState::kNumStages; ++s) {
                if (fStageMask & (1 << s)) {
                    fSamplerMatrices[s] = drawState->getSampler(s).getMatrix();
                }
            }
            drawState->preConcatSamplerMatrices(fStageMask, invVM);
        } else {
            // sad trombone sound
            fStageMask = 0;
        }
    }
    drawState->viewMatrix()->reset();
}

void GrAAHairLinePathRenderer::drawPath(GrDrawState::StageMask stageMask) {

    if (!this->createGeom(stageMask)) {
        return;
    }

    GrDrawState* drawState = fTarget->drawState();

    GrDrawTarget::AutoStateRestore asr;
    if (!drawState->getViewMatrix().hasPerspective()) {
        asr.set(fTarget);
        GrMatrix ivm;
        if (drawState->getViewInverse(&ivm)) {
            drawState->preConcatSamplerMatrices(stageMask, ivm);
        }
        drawState->setViewMatrix(GrMatrix::I());
    }

    // TODO: See whether rendering lines as degenerate quads improves perf
    // when we have a mix
    fTarget->setIndexSourceToBuffer(fLinesIndexBuffer);
    int lines = 0;
    int nBufLines = fLinesIndexBuffer->maxQuads();
    while (lines < fLineSegmentCnt) {
        int n = GrMin(fLineSegmentCnt-lines, nBufLines);
        drawState->setVertexEdgeType(GrDrawState::kHairLine_EdgeType);
        fTarget->drawIndexed(kTriangles_PrimitiveType,
                             kVertsPerLineSeg*lines,    // startV
                             0,                         // startI
                             kVertsPerLineSeg*n,        // vCount
                             kIdxsPerLineSeg*n);        // iCount
        lines += n;
    }

    fTarget->setIndexSourceToBuffer(fQuadsIndexBuffer);
    int quads = 0;
    while (quads < fQuadCnt) {
        int n = GrMin(fQuadCnt-quads, kNumQuadsInIdxBuffer);
        drawState->setVertexEdgeType(GrDrawState::kHairQuad_EdgeType);
        fTarget->drawIndexed(kTriangles_PrimitiveType,
                             4*fLineSegmentCnt + kVertsPerQuad*quads, // startV
                             0,                                       // startI
                             kVertsPerQuad*n,                         // vCount
                             kIdxsPerQuad*n);                         // iCount
        quads += n;
    }

}

bool GrAAConvexPathRenderer::onDrawPath(const SkPath& origPath,
                                        GrPathFill fill,
                                        const GrVec* translate,
                                        GrDrawTarget* target,
                                        GrDrawState::StageMask stageMask,
                                        bool antiAlias) {

    const SkPath* path = &origPath;
    if (path->isEmpty()) {
        return true;
    }
    GrDrawTarget::AutoStateRestore asr(target,
                                       GrDrawTarget::kPreserve_ASRInit);
    GrDrawState* drawState = target->drawState();

    GrMatrix vm = drawState->getViewMatrix();
    if (NULL != translate) {
        vm.postTranslate(translate->fX, translate->fY);
    }
    GrMatrix ivm;
    if (vm.invert(&ivm)) {
        drawState->preConcatSamplerMatrices(stageMask, ivm);
    }
    drawState->viewMatrix()->reset();

    GrVertexLayout layout = 0;
    for (int s = 0; s < GrDrawState::kNumStages; ++s) {
        if ((1 << s) & stageMask) {
            layout |= GrDrawTarget::StagePosAsTexCoordVertexLayoutBit(s);
        }
    }
    layout |= GrDrawTarget::kEdge_VertexLayoutBit;

    // We use the fact that SkPath::transform path does subdivision based on
    // perspective. Otherwise, we apply the view matrix when copying to the
    // segment representation.
    SkPath tmpPath;
    if (vm.hasPerspective()) {
        origPath.transform(vm, &tmpPath);
        path = &tmpPath;
        vm.reset();
    }

    QuadVertex *verts;
    uint16_t* idxs;

    int vCount;
    int iCount;
    enum {
        kPreallocSegmentCnt = 512 / sizeof(Segment),
    };
    SkSTArray<kPreallocSegmentCnt, Segment, true> segments;
    SkPoint fanPt;

    if (!get_segments(*path, vm, &segments, &fanPt, &vCount, &iCount)) {
        return false;
    }

    GrDrawTarget::AutoReleaseGeometry arg(target, layout, vCount, iCount);
    if (!arg.succeeded()) {
        return false;
    }
    verts = reinterpret_cast<QuadVertex*>(arg.vertices());
    idxs = reinterpret_cast<uint16_t*>(arg.indices());

    create_vertices(segments, fanPt, verts, idxs);

    drawState->setVertexEdgeType(GrDrawState::kQuad_EdgeType);
    target->drawIndexed(kTriangles_PrimitiveType,
                        0,        // start vertex
                        0,        // start index
                        vCount,
                        iCount);
    return true;
}

//.........这里部分代码省略.........
                case kWinding_PathFill:
                    if (fSeparateStencil) {
                        if (fStencilWrapOps) {
                            passes[0] = &gWindStencilSeparateWithWrap;
                        } else {
                            passes[0] = &gWindStencilSeparateNoWrap;
                        }
                        passCount = 2;
                        drawFace[0] = GrDrawState::kBoth_DrawFace;
                    } else {
                        if (fStencilWrapOps) {
                            passes[0] = &gWindSingleStencilWithWrapInc;
                            passes[1] = &gWindSingleStencilWithWrapDec;
                        } else {
                            passes[0] = &gWindSingleStencilNoWrapInc;
                            passes[1] = &gWindSingleStencilNoWrapDec;
                        }
                        // which is cw and which is ccw is arbitrary.
                        drawFace[0] = GrDrawState::kCW_DrawFace;
                        drawFace[1] = GrDrawState::kCCW_DrawFace;
                        passCount = 3;
                    }
                    if (stencilOnly) {
                        lastPassIsBounds = false;
                        --passCount;
                    } else {
                        lastPassIsBounds = true;
                        drawFace[passCount-1] = GrDrawState::kBoth_DrawFace;
                        if (reverse) {
                            passes[passCount-1] = &gInvWindColorPass;
                        } else {
                            passes[passCount-1] = &gWindColorPass;
                        }
                    }
                    break;
                default:
                    GrAssert(!"Unknown path fFill!");
                    return;
            }
        }
    }

    {
    for (int p = 0; p < passCount; ++p) {
        drawState->setDrawFace(drawFace[p]);
        if (NULL != passes[p]) {
            *drawState->stencil() = *passes[p];
        }

        if (lastPassIsBounds && (p == passCount-1)) {
            if (!colorWritesWereDisabled) {
                drawState->disableState(GrDrawState::kNoColorWrites_StateBit);
            }
            GrRect bounds;
            if (reverse) {
                GrAssert(NULL != drawState->getRenderTarget());
                // draw over the whole world.
                bounds.setLTRB(0, 0,
                               GrIntToScalar(drawState->getRenderTarget()->width()),
                               GrIntToScalar(drawState->getRenderTarget()->height()));
                GrMatrix vmi;
                // mapRect through persp matrix may not be correct
                if (!drawState->getViewMatrix().hasPerspective() &&
                    drawState->getViewInverse(&vmi)) {
                    vmi.mapRect(&bounds);
                } else {
                    if (stageMask) {
                        if (!drawState->getViewInverse(&vmi)) {
                            GrPrintf("Could not invert matrix.");
                            return;
                        }
                        drawState->preConcatSamplerMatrices(stageMask, vmi);
                    }
                    drawState->setViewMatrix(GrMatrix::I());
                }
            } else {
                bounds = fPath->getBounds();
                bounds.offset(fTranslate);
            }
            GrDrawTarget::AutoGeometryPush agp(fTarget);
            fTarget->drawSimpleRect(bounds, NULL, stageMask);
        } else {
            if (passCount > 1) {
                drawState->enableState(GrDrawState::kNoColorWrites_StateBit);
            }
            if (fUseIndexedDraw) {
                fTarget->drawIndexed(fPrimitiveType, 0, 0, 
                                     fVertexCnt, fIndexCnt);
            } else {
                int baseVertex = 0;
                for (int sp = 0; sp < fSubpathCount; ++sp) {
                    fTarget->drawNonIndexed(fPrimitiveType, baseVertex,
                                            fSubpathVertCount[sp]);
                    baseVertex += fSubpathVertCount[sp];
                }
            }
        }
    }
    }
}

bool GrAAHairLinePathRenderer::onDrawPath(const SkPath& path,
                                          GrPathFill fill,
                                          const GrVec* translate,
                                          GrDrawTarget* target,
                                          GrDrawState::StageMask stageMask,
                                          bool antiAlias) {

    int lineCnt;
    int quadCnt;
    GrDrawTarget::AutoReleaseGeometry arg;
    if (!this->createGeom(path,
                          translate,
                          target,
                          stageMask,
                          &lineCnt,
                          &quadCnt,
                          &arg)) {
        return false;
    }

    GrDrawTarget::AutoStateRestore asr;
    GrDrawState* drawState = target->drawState();
    if (!drawState->getViewMatrix().hasPerspective()) {
        // we are going to whack the view matrix to identity to remove
        // perspective.
        asr.set(target,
                GrDrawTarget::kPreserve_ASRInit);
        drawState = target->drawState();
        GrMatrix ivm;
        if (drawState->getViewInverse(&ivm)) {
            drawState->preConcatSamplerMatrices(stageMask, ivm);
        }
        drawState->viewMatrix()->reset();
    }
    

    // TODO: See whether rendering lines as degenerate quads improves perf
    // when we have a mix
    target->setIndexSourceToBuffer(fLinesIndexBuffer);
    int lines = 0;
    int nBufLines = fLinesIndexBuffer->maxQuads();
    while (lines < lineCnt) {
        int n = GrMin(lineCnt - lines, nBufLines);
        drawState->setVertexEdgeType(GrDrawState::kHairLine_EdgeType);
        target->drawIndexed(kTriangles_GrPrimitiveType,
                            kVertsPerLineSeg*lines,    // startV
                            0,                         // startI
                            kVertsPerLineSeg*n,        // vCount
                            kIdxsPerLineSeg*n);        // iCount
        lines += n;
    }

    target->setIndexSourceToBuffer(fQuadsIndexBuffer);
    int quads = 0;
    while (quads < quadCnt) {
        int n = GrMin(quadCnt - quads, kNumQuadsInIdxBuffer);
        drawState->setVertexEdgeType(GrDrawState::kHairQuad_EdgeType);
        target->drawIndexed(kTriangles_GrPrimitiveType,
                            4 * lineCnt + kVertsPerQuad*quads, // startV
                            0,                                 // startI
                            kVertsPerQuad*n,                   // vCount
                            kIdxsPerQuad*n);                   // iCount
        quads += n;
    }
    return true;
}