| /* |
| * Copyright 2017 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "GrCCCoverageProcessor.h" |
| |
| #include "GrMesh.h" |
| #include "glsl/GrGLSLVertexGeoBuilder.h" |
| |
| // This class implements the coverage processor with vertex shaders. |
| class GrCCCoverageProcessor::VSImpl : public GrGLSLGeometryProcessor { |
| public: |
| VSImpl(std::unique_ptr<Shader> shader, int numSides) |
| : fShader(std::move(shader)), fNumSides(numSides) {} |
| |
| private: |
| void setData(const GrGLSLProgramDataManager& pdman, const GrPrimitiveProcessor&, |
| FPCoordTransformIter&& transformIter) final { |
| this->setTransformDataHelper(SkMatrix::I(), pdman, &transformIter); |
| } |
| |
| void onEmitCode(EmitArgs&, GrGPArgs*) override; |
| |
| const std::unique_ptr<Shader> fShader; |
| const int fNumSides; |
| }; |
| |
| static constexpr int kInstanceAttribIdx_X = 0; // Transposed X values of all input points. |
| static constexpr int kInstanceAttribIdx_Y = 1; // Transposed Y values of all input points. |
| |
| // Vertex data tells the shader how to offset vertices for conservative raster, as well as how to |
| // calculate coverage values for corners and edges. |
| static constexpr int kVertexData_LeftNeighborIdShift = 10; |
| static constexpr int kVertexData_RightNeighborIdShift = 8; |
| static constexpr int kVertexData_BloatIdxShift = 6; |
| static constexpr int kVertexData_InvertNegativeCoverageBit = 1 << 5; |
| static constexpr int kVertexData_IsCornerBit = 1 << 4; |
| static constexpr int kVertexData_IsEdgeBit = 1 << 3; |
| static constexpr int kVertexData_IsHullBit = 1 << 2; |
| |
| static constexpr int32_t pack_vertex_data(int32_t leftNeighborID, int32_t rightNeighborID, |
| int32_t bloatIdx, int32_t cornerID, |
| int32_t extraData = 0) { |
| return (leftNeighborID << kVertexData_LeftNeighborIdShift) | |
| (rightNeighborID << kVertexData_RightNeighborIdShift) | |
| (bloatIdx << kVertexData_BloatIdxShift) | |
| cornerID | extraData; |
| } |
| |
| static constexpr int32_t hull_vertex_data(int32_t cornerID, int32_t bloatIdx, int n) { |
| return pack_vertex_data((cornerID + n - 1) % n, (cornerID + 1) % n, bloatIdx, cornerID, |
| kVertexData_IsHullBit); |
| } |
| |
| static constexpr int32_t edge_vertex_data(int32_t edgeID, int32_t endptIdx, int32_t bloatIdx, |
| int n) { |
| return pack_vertex_data(0 == endptIdx ? (edgeID + 1) % n : edgeID, |
| 0 == endptIdx ? (edgeID + 1) % n : edgeID, |
| bloatIdx, 0 == endptIdx ? edgeID : (edgeID + 1) % n, |
| kVertexData_IsEdgeBit | |
| (!endptIdx ? kVertexData_InvertNegativeCoverageBit : 0)); |
| } |
| |
| static constexpr int32_t corner_vertex_data(int32_t leftID, int32_t cornerID, int32_t rightID, |
| int32_t bloatIdx) { |
| return pack_vertex_data(leftID, rightID, bloatIdx, cornerID, kVertexData_IsCornerBit); |
| } |
| |
| static constexpr int32_t kTriangleVertices[] = { |
| hull_vertex_data(0, 0, 3), |
| hull_vertex_data(0, 1, 3), |
| hull_vertex_data(0, 2, 3), |
| hull_vertex_data(1, 0, 3), |
| hull_vertex_data(1, 1, 3), |
| hull_vertex_data(1, 2, 3), |
| hull_vertex_data(2, 0, 3), |
| hull_vertex_data(2, 1, 3), |
| hull_vertex_data(2, 2, 3), |
| |
| edge_vertex_data(0, 0, 0, 3), |
| edge_vertex_data(0, 0, 1, 3), |
| edge_vertex_data(0, 0, 2, 3), |
| edge_vertex_data(0, 1, 0, 3), |
| edge_vertex_data(0, 1, 1, 3), |
| edge_vertex_data(0, 1, 2, 3), |
| |
| edge_vertex_data(1, 0, 0, 3), |
| edge_vertex_data(1, 0, 1, 3), |
| edge_vertex_data(1, 0, 2, 3), |
| edge_vertex_data(1, 1, 0, 3), |
| edge_vertex_data(1, 1, 1, 3), |
| edge_vertex_data(1, 1, 2, 3), |
| |
| edge_vertex_data(2, 0, 0, 3), |
| edge_vertex_data(2, 0, 1, 3), |
| edge_vertex_data(2, 0, 2, 3), |
| edge_vertex_data(2, 1, 0, 3), |
| edge_vertex_data(2, 1, 1, 3), |
| edge_vertex_data(2, 1, 2, 3), |
| |
| corner_vertex_data(2, 0, 1, 0), |
| corner_vertex_data(2, 0, 1, 1), |
| corner_vertex_data(2, 0, 1, 2), |
| corner_vertex_data(2, 0, 1, 3), |
| |
| corner_vertex_data(0, 1, 2, 0), |
| corner_vertex_data(0, 1, 2, 1), |
| corner_vertex_data(0, 1, 2, 2), |
| corner_vertex_data(0, 1, 2, 3), |
| |
| corner_vertex_data(1, 2, 0, 0), |
| corner_vertex_data(1, 2, 0, 1), |
| corner_vertex_data(1, 2, 0, 2), |
| corner_vertex_data(1, 2, 0, 3), |
| }; |
| |
| GR_DECLARE_STATIC_UNIQUE_KEY(gTriangleVertexBufferKey); |
| |
| static constexpr uint16_t kRestartStrip = 0xffff; |
| |
| static constexpr uint16_t kTriangleIndicesAsStrips[] = { |
| 1, 2, 0, 3, 8, kRestartStrip, // First corner and main body of the hull. |
| 4, 5, 3, 6, 8, 7, kRestartStrip, // Opposite side and corners of the hull. |
| 10, 9, 11, 14, 12, 13, kRestartStrip, // First edge. |
| 16, 15, 17, 20, 18, 19, kRestartStrip, // Second edge. |
| 22, 21, 23, 26, 24, 25, kRestartStrip, // Third edge. |
| 28, 27, 29, 30, kRestartStrip, // First corner. |
| 32, 31, 33, 34, kRestartStrip, // Second corner. |
| 36, 35, 37, 38 // Third corner. |
| }; |
| |
| static constexpr uint16_t kTriangleIndicesAsTris[] = { |
| // First corner and main body of the hull. |
| 1, 2, 0, |
| 2, 3, 0, |
| 0, 3, 8, // Main body. |
| |
| // Opposite side and corners of the hull. |
| 4, 5, 3, |
| 5, 6, 3, |
| 3, 6, 8, |
| 6, 7, 8, |
| |
| // First edge. |
| 10, 9, 11, |
| 9, 14, 11, |
| 11, 14, 12, |
| 14, 13, 12, |
| |
| // Second edge. |
| 16, 15, 17, |
| 15, 20, 17, |
| 17, 20, 18, |
| 20, 19, 18, |
| |
| // Third edge. |
| 22, 21, 23, |
| 21, 26, 23, |
| 23, 26, 24, |
| 26, 25, 24, |
| |
| // First corner. |
| 28, 27, 29, |
| 27, 30, 29, |
| |
| // Second corner. |
| 32, 31, 33, |
| 31, 34, 33, |
| |
| // Third corner. |
| 36, 35, 37, |
| 35, 38, 37, |
| }; |
| |
| GR_DECLARE_STATIC_UNIQUE_KEY(gTriangleIndexBufferKey); |
| |
| // Curves, including quadratics, are drawn with a four-sided hull. |
| static constexpr int32_t kCurveVertices[] = { |
| hull_vertex_data(0, 0, 4), |
| hull_vertex_data(0, 1, 4), |
| hull_vertex_data(0, 2, 4), |
| hull_vertex_data(1, 0, 4), |
| hull_vertex_data(1, 1, 4), |
| hull_vertex_data(1, 2, 4), |
| hull_vertex_data(2, 0, 4), |
| hull_vertex_data(2, 1, 4), |
| hull_vertex_data(2, 2, 4), |
| hull_vertex_data(3, 0, 4), |
| hull_vertex_data(3, 1, 4), |
| hull_vertex_data(3, 2, 4), |
| |
| corner_vertex_data(3, 0, 1, 0), |
| corner_vertex_data(3, 0, 1, 1), |
| corner_vertex_data(3, 0, 1, 2), |
| corner_vertex_data(3, 0, 1, 3), |
| |
| corner_vertex_data(2, 3, 0, 0), |
| corner_vertex_data(2, 3, 0, 1), |
| corner_vertex_data(2, 3, 0, 2), |
| corner_vertex_data(2, 3, 0, 3), |
| }; |
| |
| GR_DECLARE_STATIC_UNIQUE_KEY(gCurveVertexBufferKey); |
| |
| static constexpr uint16_t kCurveIndicesAsStrips[] = { |
| 1, 0, 2, 11, 3, 5, 4, kRestartStrip, // First half of the hull (split diagonally). |
| 7, 6, 8, 5, 9, 11, 10, kRestartStrip, // Second half of the hull. |
| 13, 12, 14, 15, kRestartStrip, // First corner. |
| 17, 16, 18, 19 // Final corner. |
| }; |
| |
| static constexpr uint16_t kCurveIndicesAsTris[] = { |
| // First half of the hull (split diagonally). |
| 1, 0, 2, |
| 0, 11, 2, |
| 2, 11, 3, |
| 11, 5, 3, |
| 3, 5, 4, |
| |
| // Second half of the hull. |
| 7, 6, 8, |
| 6, 5, 8, |
| 8, 5, 9, |
| 5, 11, 9, |
| 9, 11, 10, |
| |
| // First corner. |
| 13, 12, 14, |
| 12, 15, 14, |
| |
| // Final corner. |
| 17, 16, 18, |
| 16, 19, 18, |
| }; |
| |
| GR_DECLARE_STATIC_UNIQUE_KEY(gCurveIndexBufferKey); |
| |
| // Generates a conservative raster hull around a triangle or curve. For triangles we generate |
| // additional conservative rasters with coverage ramps around the edges and corners. |
| // |
| // Triangles are drawn in three steps: (1) Draw a conservative raster of the entire triangle, with a |
| // coverage of +1. (2) Draw conservative rasters around each edge, with a coverage ramp from -1 to |
| // 0. These edge coverage values convert jagged conservative raster edges into smooth, antialiased |
| // ones. (3) Draw conservative rasters (aka pixel-size boxes) around each corner, replacing the |
| // previous coverage values with ones that ramp to zero in the bloat vertices that fall outside the |
| // triangle. |
| // |
| // Curves are drawn in two separate passes. Here we just draw a conservative raster around the input |
| // points. The Shader takes care of everything else for now. The final curve corners get touched up |
| // in a later step by VSCornerImpl. |
| void GrCCCoverageProcessor::VSImpl::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) { |
| const GrCCCoverageProcessor& proc = args.fGP.cast<GrCCCoverageProcessor>(); |
| GrGLSLVertexBuilder* v = args.fVertBuilder; |
| int numInputPoints = proc.numInputPoints(); |
| |
| int inputWidth = (4 == numInputPoints || proc.hasInputWeight()) ? 4 : 3; |
| const char* swizzle = (4 == inputWidth) ? "xyzw" : "xyz"; |
| v->codeAppendf("float%ix2 pts = transpose(float2x%i(%s.%s, %s.%s));", inputWidth, inputWidth, |
| proc.fInstanceAttributes[kInstanceAttribIdx_X].name(), swizzle, |
| proc.fInstanceAttributes[kInstanceAttribIdx_Y].name(), swizzle); |
| |
| v->codeAppend ("half wind;"); |
| Shader::CalcWind(proc, v, "pts", "wind"); |
| if (PrimitiveType::kWeightedTriangles == proc.fPrimitiveType) { |
| SkASSERT(3 == numInputPoints); |
| SkASSERT(kFloat4_GrVertexAttribType == |
| proc.fInstanceAttributes[kInstanceAttribIdx_X].type()); |
| v->codeAppendf("wind *= %s.w;", proc.fInstanceAttributes[kInstanceAttribIdx_X].name()); |
| } |
| |
| float bloat = kAABloatRadius; |
| #ifdef SK_DEBUG |
| if (proc.debugBloatEnabled()) { |
| bloat *= proc.debugBloat(); |
| } |
| #endif |
| v->defineConstant("bloat", bloat); |
| |
| const char* hullPts = "pts"; |
| fShader->emitSetupCode(v, "pts", "wind", (4 == fNumSides) ? &hullPts : nullptr); |
| |
| // Reverse all indices if the wind is counter-clockwise: [0, 1, 2] -> [2, 1, 0]. |
| v->codeAppendf("int clockwise_indices = wind > 0 ? %s : 0x%x - %s;", |
| proc.fVertexAttribute.name(), |
| ((fNumSides - 1) << kVertexData_LeftNeighborIdShift) | |
| ((fNumSides - 1) << kVertexData_RightNeighborIdShift) | |
| (((1 << kVertexData_RightNeighborIdShift) - 1) ^ 3) | |
| (fNumSides - 1), |
| proc.fVertexAttribute.name()); |
| |
| // Here we generate conservative raster geometry for the input polygon. It is the convex |
| // hull of N pixel-size boxes, one centered on each the input points. Each corner has three |
| // vertices, where one or two may cause degenerate triangles. The vertex data tells us how |
| // to offset each vertex. Triangle edges and corners are also handled here using the same |
| // concept. For more details on conservative raster, see: |
| // https://developer.nvidia.com/gpugems/GPUGems2/gpugems2_chapter42.html |
| v->codeAppendf("float2 corner = %s[clockwise_indices & 3];", hullPts); |
| v->codeAppendf("float2 left = %s[clockwise_indices >> %i];", |
| hullPts, kVertexData_LeftNeighborIdShift); |
| v->codeAppendf("float2 right = %s[(clockwise_indices >> %i) & 3];", |
| hullPts, kVertexData_RightNeighborIdShift); |
| |
| v->codeAppend ("float2 leftbloat = sign(corner - left);"); |
| v->codeAppend ("leftbloat = float2(0 != leftbloat.y ? leftbloat.y : leftbloat.x, " |
| "0 != leftbloat.x ? -leftbloat.x : -leftbloat.y);"); |
| |
| v->codeAppend ("float2 rightbloat = sign(right - corner);"); |
| v->codeAppend ("rightbloat = float2(0 != rightbloat.y ? rightbloat.y : rightbloat.x, " |
| "0 != rightbloat.x ? -rightbloat.x : -rightbloat.y);"); |
| |
| v->codeAppend ("bool2 left_right_notequal = notEqual(leftbloat, rightbloat);"); |
| |
| v->codeAppend ("float2 bloatdir = leftbloat;"); |
| |
| v->codeAppend ("float2 leftdir = corner - left;"); |
| v->codeAppend ("leftdir = (float2(0) != leftdir) ? normalize(leftdir) : float2(1, 0);"); |
| |
| v->codeAppend ("float2 rightdir = right - corner;"); |
| v->codeAppend ("rightdir = (float2(0) != rightdir) ? normalize(rightdir) : float2(1, 0);"); |
| |
| v->codeAppendf("if (0 != (%s & %i)) {", // Are we a corner? |
| proc.fVertexAttribute.name(), kVertexData_IsCornerBit); |
| |
| // In corner boxes, all 4 coverage values will not map linearly. |
| // Therefore it is important to align the box so its diagonal shared |
| // edge points out of the triangle, in the direction that ramps to 0. |
| v->codeAppend ( "bloatdir = float2(leftdir.x > rightdir.x ? +1 : -1, " |
| "leftdir.y > rightdir.y ? +1 : -1);"); |
| |
| // For corner boxes, we hack left_right_notequal to always true. This |
| // in turn causes the upcoming code to always rotate, generating all |
| // 4 vertices of the corner box. |
| v->codeAppendf( "left_right_notequal = bool2(true);"); |
| v->codeAppend ("}"); |
| |
| // At each corner of the polygon, our hull will have either 1, 2, or 3 vertices (or 4 if |
| // it's a corner box). We begin with this corner's first raster vertex (leftbloat), then |
| // continue rotating 90 degrees clockwise until we reach the desired raster vertex for this |
| // invocation. Corners with less than 3 corresponding raster vertices will result in |
| // redundant vertices and degenerate triangles. |
| v->codeAppendf("int bloatidx = (%s >> %i) & 3;", proc.fVertexAttribute.name(), |
| kVertexData_BloatIdxShift); |
| v->codeAppend ("switch (bloatidx) {"); |
| v->codeAppend ( "case 3:"); |
| // Only corners will have bloatidx=3, and corners always rotate. |
| v->codeAppend ( "bloatdir = float2(-bloatdir.y, +bloatdir.x);"); // 90 deg CW. |
| // fallthru. |
| v->codeAppend ( "case 2:"); |
| v->codeAppendf( "if (all(left_right_notequal)) {"); |
| v->codeAppend ( "bloatdir = float2(-bloatdir.y, +bloatdir.x);"); // 90 deg CW. |
| v->codeAppend ( "}"); |
| // fallthru. |
| v->codeAppend ( "case 1:"); |
| v->codeAppendf( "if (any(left_right_notequal)) {"); |
| v->codeAppend ( "bloatdir = float2(-bloatdir.y, +bloatdir.x);"); // 90 deg CW. |
| v->codeAppend ( "}"); |
| // fallthru. |
| v->codeAppend ("}"); |
| |
| v->codeAppend ("float2 vertex = corner + bloatdir * bloat;"); |
| gpArgs->fPositionVar.set(kFloat2_GrSLType, "vertex"); |
| |
| // Hulls have a coverage of +1 all around. |
| v->codeAppend ("half coverage = +1;"); |
| |
| if (3 == fNumSides) { |
| v->codeAppend ("half left_coverage; {"); |
| Shader::CalcEdgeCoverageAtBloatVertex(v, "left", "corner", "bloatdir", "left_coverage"); |
| v->codeAppend ("}"); |
| |
| v->codeAppend ("half right_coverage; {"); |
| Shader::CalcEdgeCoverageAtBloatVertex(v, "corner", "right", "bloatdir", "right_coverage"); |
| v->codeAppend ("}"); |
| |
| v->codeAppendf("if (0 != (%s & %i)) {", // Are we an edge? |
| proc.fVertexAttribute.name(), kVertexData_IsEdgeBit); |
| v->codeAppend ( "coverage = left_coverage;"); |
| v->codeAppend ("}"); |
| |
| v->codeAppendf("if (0 != (%s & %i)) {", // Invert coverage? |
| proc.fVertexAttribute.name(), |
| kVertexData_InvertNegativeCoverageBit); |
| v->codeAppend ( "coverage = -1 - coverage;"); |
| v->codeAppend ("}"); |
| } |
| |
| // Non-corner geometry should have zero effect from corner coverage. |
| v->codeAppend ("half2 corner_coverage = half2(0);"); |
| |
| v->codeAppendf("if (0 != (%s & %i)) {", // Are we a corner? |
| proc.fVertexAttribute.name(), kVertexData_IsCornerBit); |
| // We use coverage=-1 to erase what the hull geometry wrote. |
| // |
| // In the context of curves, this effectively means "wind = -wind" and |
| // causes the Shader to erase what it had written previously for the hull. |
| // |
| // For triangles it just erases the "+1" value written by the hull geometry. |
| v->codeAppend ( "coverage = -1;"); |
| if (3 == fNumSides) { |
| // Triangle corners also have to erase what the edge geometry wrote. |
| v->codeAppend ("coverage -= left_coverage + right_coverage;"); |
| } |
| |
| // Corner boxes require attenuated coverage. |
| v->codeAppend ( "half attenuation; {"); |
| Shader::CalcCornerAttenuation(v, "leftdir", "rightdir", "attenuation"); |
| v->codeAppend ( "}"); |
| |
| // Attenuate corner coverage towards the outermost vertex (where bloatidx=0). |
| // This is all that curves need: At each vertex of the corner box, the curve |
| // Shader will calculate the curve's local coverage value, interpolate it |
| // alongside our attenuation parameter, and multiply the two together for a |
| // final coverage value. |
| v->codeAppend ( "corner_coverage = (0 == bloatidx) ? half2(0, attenuation) : half2(1);"); |
| |
| if (3 == fNumSides) { |
| // For triangles we also provide the actual coverage values at each vertex of |
| // the corner box. |
| v->codeAppend ("if (1 == bloatidx || 2 == bloatidx) {"); |
| v->codeAppend ( "corner_coverage.x += right_coverage;"); |
| v->codeAppend ("}"); |
| v->codeAppend ("if (bloatidx >= 2) {"); |
| v->codeAppend ( "corner_coverage.x += left_coverage;"); |
| v->codeAppend ("}"); |
| } |
| v->codeAppend ("}"); |
| |
| GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler; |
| v->codeAppend ("coverage *= wind;"); |
| v->codeAppend ("corner_coverage.x *= wind;"); |
| fShader->emitVaryings(varyingHandler, GrGLSLVarying::Scope::kVertToFrag, &v->code(), |
| gpArgs->fPositionVar.c_str(), "coverage", "corner_coverage"); |
| |
| varyingHandler->emitAttributes(proc); |
| SkASSERT(!args.fFPCoordTransformHandler->nextCoordTransform()); |
| |
| // Fragment shader. |
| fShader->emitFragmentCode(proc, args.fFragBuilder, args.fOutputColor, args.fOutputCoverage); |
| } |
| |
| void GrCCCoverageProcessor::initVS(GrResourceProvider* rp) { |
| SkASSERT(Impl::kVertexShader == fImpl); |
| const GrCaps& caps = *rp->caps(); |
| |
| switch (fPrimitiveType) { |
| case PrimitiveType::kTriangles: |
| case PrimitiveType::kWeightedTriangles: { |
| GR_DEFINE_STATIC_UNIQUE_KEY(gTriangleVertexBufferKey); |
| fVSVertexBuffer = rp->findOrMakeStaticBuffer(kVertex_GrBufferType, |
| sizeof(kTriangleVertices), |
| kTriangleVertices, |
| gTriangleVertexBufferKey); |
| GR_DEFINE_STATIC_UNIQUE_KEY(gTriangleIndexBufferKey); |
| if (caps.usePrimitiveRestart()) { |
| fVSIndexBuffer = rp->findOrMakeStaticBuffer(kIndex_GrBufferType, |
| sizeof(kTriangleIndicesAsStrips), |
| kTriangleIndicesAsStrips, |
| gTriangleIndexBufferKey); |
| fVSNumIndicesPerInstance = SK_ARRAY_COUNT(kTriangleIndicesAsStrips); |
| } else { |
| fVSIndexBuffer = rp->findOrMakeStaticBuffer(kIndex_GrBufferType, |
| sizeof(kTriangleIndicesAsTris), |
| kTriangleIndicesAsTris, |
| gTriangleIndexBufferKey); |
| fVSNumIndicesPerInstance = SK_ARRAY_COUNT(kTriangleIndicesAsTris); |
| } |
| break; |
| } |
| |
| case PrimitiveType::kQuadratics: |
| case PrimitiveType::kCubics: |
| case PrimitiveType::kConics: { |
| GR_DEFINE_STATIC_UNIQUE_KEY(gCurveVertexBufferKey); |
| fVSVertexBuffer = rp->findOrMakeStaticBuffer(kVertex_GrBufferType, |
| sizeof(kCurveVertices), kCurveVertices, |
| gCurveVertexBufferKey); |
| GR_DEFINE_STATIC_UNIQUE_KEY(gCurveIndexBufferKey); |
| if (caps.usePrimitiveRestart()) { |
| fVSIndexBuffer = rp->findOrMakeStaticBuffer(kIndex_GrBufferType, |
| sizeof(kCurveIndicesAsStrips), |
| kCurveIndicesAsStrips, |
| gCurveIndexBufferKey); |
| fVSNumIndicesPerInstance = SK_ARRAY_COUNT(kCurveIndicesAsStrips); |
| } else { |
| fVSIndexBuffer = rp->findOrMakeStaticBuffer(kIndex_GrBufferType, |
| sizeof(kCurveIndicesAsTris), |
| kCurveIndicesAsTris, |
| gCurveIndexBufferKey); |
| fVSNumIndicesPerInstance = SK_ARRAY_COUNT(kCurveIndicesAsTris); |
| } |
| break; |
| } |
| } |
| |
| GrVertexAttribType xyAttribType; |
| if (4 == this->numInputPoints() || this->hasInputWeight()) { |
| GR_STATIC_ASSERT(offsetof(QuadPointInstance, fX) == 0); |
| GR_STATIC_ASSERT(sizeof(QuadPointInstance::fX) == |
| GrVertexAttribTypeSize(kFloat4_GrVertexAttribType)); |
| GR_STATIC_ASSERT(sizeof(QuadPointInstance::fY) == |
| GrVertexAttribTypeSize(kFloat4_GrVertexAttribType)); |
| xyAttribType = kFloat4_GrVertexAttribType; |
| } else { |
| GR_STATIC_ASSERT(offsetof(TriPointInstance, fX) == 0); |
| GR_STATIC_ASSERT(sizeof(TriPointInstance::fX) == |
| GrVertexAttribTypeSize(kFloat3_GrVertexAttribType)); |
| GR_STATIC_ASSERT(sizeof(TriPointInstance::fY) == |
| GrVertexAttribTypeSize(kFloat3_GrVertexAttribType)); |
| xyAttribType = kFloat3_GrVertexAttribType; |
| } |
| fInstanceAttributes[kInstanceAttribIdx_X] = {"X", xyAttribType}; |
| fInstanceAttributes[kInstanceAttribIdx_Y] = {"Y", xyAttribType}; |
| this->setInstanceAttributeCnt(2); |
| fVertexAttribute = {"vertexdata", kInt_GrVertexAttribType}; |
| this->setVertexAttributeCnt(1); |
| |
| if (caps.usePrimitiveRestart()) { |
| fVSTriangleType = GrPrimitiveType::kTriangleStrip; |
| } else { |
| fVSTriangleType = GrPrimitiveType::kTriangles; |
| } |
| } |
| |
| void GrCCCoverageProcessor::appendVSMesh(GrBuffer* instanceBuffer, int instanceCount, |
| int baseInstance, SkTArray<GrMesh>* out) const { |
| SkASSERT(Impl::kVertexShader == fImpl); |
| GrMesh& mesh = out->emplace_back(fVSTriangleType); |
| auto primitiveRestart = GrPrimitiveRestart(GrPrimitiveType::kTriangleStrip == fVSTriangleType); |
| mesh.setIndexedInstanced(fVSIndexBuffer.get(), fVSNumIndicesPerInstance, instanceBuffer, |
| instanceCount, baseInstance, primitiveRestart); |
| mesh.setVertexData(fVSVertexBuffer.get(), 0); |
| } |
| |
| GrGLSLPrimitiveProcessor* GrCCCoverageProcessor::createVSImpl(std::unique_ptr<Shader> shadr) const { |
| switch (fPrimitiveType) { |
| case PrimitiveType::kTriangles: |
| case PrimitiveType::kWeightedTriangles: |
| return new VSImpl(std::move(shadr), 3); |
| case PrimitiveType::kQuadratics: |
| case PrimitiveType::kCubics: |
| case PrimitiveType::kConics: |
| return new VSImpl(std::move(shadr), 4); |
| } |
| SK_ABORT("Invalid RenderPass"); |
| return nullptr; |
| } |
