| /* |
| * 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 "GrCCPRCoverageProcessor.h" |
| |
| #include "ccpr/GrCCPRTriangleProcessor.h" |
| #include "ccpr/GrCCPRQuadraticProcessor.h" |
| #include "ccpr/GrCCPRCubicProcessor.h" |
| #include "glsl/GrGLSLFragmentShaderBuilder.h" |
| #include "glsl/GrGLSLGeometryShaderBuilder.h" |
| #include "glsl/GrGLSLProgramBuilder.h" |
| #include "glsl/GrGLSLVertexShaderBuilder.h" |
| |
| const char* GrCCPRCoverageProcessor::GetProcessorName(Mode mode) { |
| switch (mode) { |
| case Mode::kTriangleHulls: |
| return "GrCCPRTriangleHullAndEdgeProcessor (hulls)"; |
| case Mode::kTriangleEdges: |
| return "GrCCPRTriangleHullAndEdgeProcessor (edges)"; |
| case Mode::kCombinedTriangleHullsAndEdges: |
| return "GrCCPRTriangleHullAndEdgeProcessor (combined hulls & edges)"; |
| case Mode::kTriangleCorners: |
| return "GrCCPRTriangleCornerProcessor"; |
| case Mode::kQuadraticHulls: |
| return "GrCCPRQuadraticHullProcessor"; |
| case Mode::kQuadraticFlatEdges: |
| return "GrCCPRQuadraticSharedEdgeProcessor"; |
| case Mode::kSerpentineInsets: |
| return "GrCCPRCubicInsetProcessor (serpentine)"; |
| case Mode::kSerpentineBorders: |
| return "GrCCPRCubicBorderProcessor (serpentine)"; |
| case Mode::kLoopInsets: |
| return "GrCCPRCubicInsetProcessor (loop)"; |
| case Mode::kLoopBorders: |
| return "GrCCPRCubicBorderProcessor (loop)"; |
| } |
| SkFAIL("Unexpected ccpr coverage processor mode."); |
| return nullptr; |
| } |
| |
| GrCCPRCoverageProcessor::GrCCPRCoverageProcessor(Mode mode, GrBuffer* pointsBuffer) |
| : fMode(mode) |
| , fInstanceAttrib(this->addInstanceAttrib("instance", kVec4i_GrVertexAttribType, |
| kHigh_GrSLPrecision)) { |
| fPointsBufferAccess.reset(kRG_float_GrPixelConfig, pointsBuffer, kVertex_GrShaderFlag); |
| this->addBufferAccess(&fPointsBufferAccess); |
| |
| this->setWillUseGeoShader(); |
| |
| this->initClassID<GrCCPRCoverageProcessor>(); |
| } |
| |
| void GrCCPRCoverageProcessor::getGLSLProcessorKey(const GrShaderCaps&, |
| GrProcessorKeyBuilder* b) const { |
| b->add32(int(fMode)); |
| } |
| |
| GrGLSLPrimitiveProcessor* GrCCPRCoverageProcessor::createGLSLInstance(const GrShaderCaps&) const { |
| switch (fMode) { |
| using GeometryType = GrCCPRTriangleHullAndEdgeProcessor::GeometryType; |
| |
| case Mode::kTriangleHulls: |
| return new GrCCPRTriangleHullAndEdgeProcessor(GeometryType::kHulls); |
| case Mode::kTriangleEdges: |
| return new GrCCPRTriangleHullAndEdgeProcessor(GeometryType::kEdges); |
| case Mode::kCombinedTriangleHullsAndEdges: |
| return new GrCCPRTriangleHullAndEdgeProcessor(GeometryType::kHullsAndEdges); |
| case Mode::kTriangleCorners: |
| return new GrCCPRTriangleCornerProcessor(); |
| case Mode::kQuadraticHulls: |
| return new GrCCPRQuadraticHullProcessor(); |
| case Mode::kQuadraticFlatEdges: |
| return new GrCCPRQuadraticSharedEdgeProcessor(); |
| case Mode::kSerpentineInsets: |
| return new GrCCPRCubicInsetProcessor(GrCCPRCubicProcessor::Type::kSerpentine); |
| case Mode::kSerpentineBorders: |
| return new GrCCPRCubicBorderProcessor(GrCCPRCubicProcessor::Type::kSerpentine); |
| case Mode::kLoopInsets: |
| return new GrCCPRCubicInsetProcessor(GrCCPRCubicProcessor::Type::kLoop); |
| case Mode::kLoopBorders: |
| return new GrCCPRCubicBorderProcessor(GrCCPRCubicProcessor::Type::kLoop); |
| } |
| SkFAIL("Unexpected ccpr coverage processor mode."); |
| return nullptr; |
| } |
| |
| using PrimitiveProcessor = GrCCPRCoverageProcessor::PrimitiveProcessor; |
| |
| void PrimitiveProcessor::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) { |
| const GrCCPRCoverageProcessor& proc = args.fGP.cast<GrCCPRCoverageProcessor>(); |
| |
| GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler; |
| switch (fCoverageType) { |
| case CoverageType::kOne: |
| case CoverageType::kShader: |
| varyingHandler->addFlatVarying("wind", &fFragWind, kLow_GrSLPrecision); |
| break; |
| case CoverageType::kInterpolated: |
| varyingHandler->addVarying("coverage_times_wind", &fFragCoverageTimesWind, |
| kMedium_GrSLPrecision); |
| break; |
| } |
| this->resetVaryings(varyingHandler); |
| |
| varyingHandler->emitAttributes(proc); |
| |
| this->emitVertexShader(proc, args.fVertBuilder, args.fTexelBuffers[0], args.fRTAdjustName, |
| gpArgs); |
| this->emitGeometryShader(proc, args.fGeomBuilder, args.fRTAdjustName); |
| this->emitCoverage(proc, args.fFragBuilder, args.fOutputColor, args.fOutputCoverage); |
| |
| SkASSERT(!args.fFPCoordTransformHandler->nextCoordTransform()); |
| } |
| |
| void PrimitiveProcessor::emitVertexShader(const GrCCPRCoverageProcessor& proc, |
| GrGLSLVertexBuilder* v, |
| const TexelBufferHandle& pointsBuffer, |
| const char* rtAdjust, GrGPArgs* gpArgs) const { |
| v->codeAppendf("int packedoffset = %s.w;", proc.instanceAttrib()); |
| v->codeAppend ("highp vec2 atlasoffset = vec2((packedoffset<<16) >> 16, packedoffset >> 16);"); |
| |
| this->onEmitVertexShader(proc, v, pointsBuffer, "atlasoffset", rtAdjust, gpArgs); |
| } |
| |
| void PrimitiveProcessor::emitGeometryShader(const GrCCPRCoverageProcessor& proc, |
| GrGLSLGeometryBuilder* g, const char* rtAdjust) const { |
| g->declareGlobal(fGeomWind); |
| this->emitWind(g, rtAdjust, fGeomWind.c_str()); |
| |
| SkString emitVertexFn; |
| SkSTArray<2, GrShaderVar> emitArgs; |
| const char* position = emitArgs.emplace_back("position", kVec2f_GrSLType, |
| GrShaderVar::kNonArray, |
| kHigh_GrSLPrecision).c_str(); |
| const char* coverage = emitArgs.emplace_back("coverage", kFloat_GrSLType, |
| GrShaderVar::kNonArray, |
| kHigh_GrSLPrecision).c_str(); |
| g->emitFunction(kVoid_GrSLType, "emitVertex", emitArgs.count(), emitArgs.begin(), [&]() { |
| SkString fnBody; |
| this->emitPerVertexGeometryCode(&fnBody, position, coverage, fGeomWind.c_str()); |
| if (fFragWind.gsOut()) { |
| fnBody.appendf("%s = %s;", fFragWind.gsOut(), fGeomWind.c_str()); |
| } |
| if (fFragCoverageTimesWind.gsOut()) { |
| fnBody.appendf("%s = %s * %s;", |
| fFragCoverageTimesWind.gsOut(), coverage, fGeomWind.c_str()); |
| } |
| fnBody.append ("gl_Position = vec4(position, 0, 1);"); |
| fnBody.append ("EmitVertex();"); |
| return fnBody; |
| }().c_str(), &emitVertexFn); |
| |
| g->codeAppendf("highp vec2 bloat = %f * abs(%s.xz);", kAABloatRadius, rtAdjust); |
| |
| #ifdef SK_DEBUG |
| if (proc.debugVisualizations()) { |
| g->codeAppendf("bloat *= %f;", GrCCPRCoverageProcessor::kDebugBloat); |
| } |
| #endif |
| |
| return this->onEmitGeometryShader(g, emitVertexFn.c_str(), fGeomWind.c_str(), rtAdjust); |
| } |
| |
| int PrimitiveProcessor::emitHullGeometry(GrGLSLGeometryBuilder* g, const char* emitVertexFn, |
| const char* polygonPts, int numSides, |
| const char* wedgeIdx, const char* insetPts) const { |
| SkASSERT(numSides >= 3); |
| |
| if (!insetPts) { |
| g->codeAppendf("highp vec2 centroidpt = %s * vec%i(%f);", |
| polygonPts, numSides, 1.0 / numSides); |
| } |
| |
| g->codeAppendf("int previdx = (%s + %i) %% %i, " |
| "nextidx = (%s + 1) %% %i;", |
| wedgeIdx, numSides - 1, numSides, wedgeIdx, numSides); |
| |
| g->codeAppendf("highp vec2 self = %s[%s];" |
| "highp int leftidx = %s > 0 ? previdx : nextidx;" |
| "highp int rightidx = %s > 0 ? nextidx : previdx;", |
| polygonPts, wedgeIdx, fGeomWind.c_str(), fGeomWind.c_str()); |
| |
| // Which quadrant does the vector from self -> right fall into? |
| g->codeAppendf("highp vec2 right = %s[rightidx];", polygonPts); |
| if (3 == numSides) { |
| // TODO: evaluate perf gains. |
| g->codeAppend ("highp vec2 qsr = sign(right - self);"); |
| } else { |
| SkASSERT(4 == numSides); |
| g->codeAppendf("highp vec2 diag = %s[(%s + 2) %% 4];", polygonPts, wedgeIdx); |
| g->codeAppend ("highp vec2 qsr = sign((right != self ? right : diag) - self);"); |
| } |
| |
| // Which quadrant does the vector from left -> self fall into? |
| g->codeAppendf("highp vec2 qls = sign(self - %s[leftidx]);", polygonPts); |
| |
| // d2 just helps us reduce triangle counts with orthogonal, axis-aligned lines. |
| // TODO: evaluate perf gains. |
| const char* dr2 = "dr"; |
| if (3 == numSides) { |
| // TODO: evaluate perf gains. |
| g->codeAppend ("highp vec2 dr = vec2(qsr.y != 0 ? +qsr.y : +qsr.x, " |
| "qsr.x != 0 ? -qsr.x : +qsr.y);"); |
| g->codeAppend ("highp vec2 dr2 = vec2(qsr.y != 0 ? +qsr.y : -qsr.x, " |
| "qsr.x != 0 ? -qsr.x : -qsr.y);"); |
| g->codeAppend ("highp vec2 dl = vec2(qls.y != 0 ? +qls.y : +qls.x, " |
| "qls.x != 0 ? -qls.x : +qls.y);"); |
| dr2 = "dr2"; |
| } else { |
| g->codeAppend ("highp vec2 dr = vec2(qsr.y != 0 ? +qsr.y : 1, " |
| "qsr.x != 0 ? -qsr.x : 1);"); |
| g->codeAppend ("highp vec2 dl = (qls == vec2(0)) ? dr : vec2(qls.y != 0 ? +qls.y : 1, " |
| "qls.x != 0 ? -qls.x : 1);"); |
| } |
| g->codeAppendf("bvec2 dnotequal = notEqual(%s, dl);", dr2); |
| |
| // Emit one third of what is the convex hull of pixel-size boxes centered on the vertices. |
| // Each invocation emits a different third. |
| if (insetPts) { |
| g->codeAppendf("%s(%s[rightidx], 1);", emitVertexFn, insetPts); |
| } |
| g->codeAppendf("%s(right + bloat * dr, 1);", emitVertexFn); |
| if (insetPts) { |
| g->codeAppendf("%s(%s[%s], 1);", emitVertexFn, insetPts, wedgeIdx); |
| } else { |
| g->codeAppendf("%s(centroidpt, 1);", emitVertexFn); |
| } |
| g->codeAppendf("%s(self + bloat * %s, 1);", emitVertexFn, dr2); |
| g->codeAppend ("if (any(dnotequal)) {"); |
| g->codeAppendf( "%s(self + bloat * dl, 1);", emitVertexFn); |
| g->codeAppend ("}"); |
| g->codeAppend ("if (all(dnotequal)) {"); |
| g->codeAppendf( "%s(self + bloat * vec2(-dl.y, dl.x), 1);", emitVertexFn); |
| g->codeAppend ("}"); |
| g->codeAppend ("EndPrimitive();"); |
| |
| return insetPts ? 6 : 5; |
| } |
| |
| int PrimitiveProcessor::emitEdgeGeometry(GrGLSLGeometryBuilder* g, const char* emitVertexFn, |
| const char* leftPt, const char* rightPt, |
| const char* distanceEquation) const { |
| if (!distanceEquation) { |
| this->emitEdgeDistanceEquation(g, leftPt, rightPt, "highp vec3 edge_distance_equation"); |
| distanceEquation = "edge_distance_equation"; |
| } |
| |
| // qlr is defined in emitEdgeDistanceEquation. |
| g->codeAppendf("highp mat2 endpts = mat2(%s - bloat * qlr, %s + bloat * qlr);", |
| leftPt, rightPt); |
| g->codeAppendf("mediump vec2 endpts_coverage = %s.xy * endpts + %s.z;", |
| distanceEquation, distanceEquation); |
| |
| // d1 is defined in emitEdgeDistanceEquation. |
| g->codeAppend ("highp vec2 d2 = d1;"); |
| g->codeAppend ("bool aligned = qlr.x == 0 || qlr.y == 0;"); |
| g->codeAppend ("if (aligned) {"); |
| g->codeAppend ( "d1 -= qlr;"); |
| g->codeAppend ( "d2 += qlr;"); |
| g->codeAppend ("}"); |
| |
| // Emit the convex hull of 2 pixel-size boxes centered on the endpoints of the edge. Each |
| // invocation emits a different edge. Emit negative coverage that subtracts the appropiate |
| // amount back out from the hull we drew above. |
| g->codeAppend ("if (!aligned) {"); |
| g->codeAppendf( "%s(endpts[0], endpts_coverage[0]);", emitVertexFn); |
| g->codeAppend ("}"); |
| g->codeAppendf("%s(%s + bloat * d1, -1);", emitVertexFn, leftPt); |
| g->codeAppendf("%s(%s - bloat * d2, 0);", emitVertexFn, leftPt); |
| g->codeAppendf("%s(%s + bloat * d2, -1);", emitVertexFn, rightPt); |
| g->codeAppendf("%s(%s - bloat * d1, 0);", emitVertexFn, rightPt); |
| g->codeAppend ("if (!aligned) {"); |
| g->codeAppendf( "%s(endpts[1], endpts_coverage[1]);", emitVertexFn); |
| g->codeAppend ("}"); |
| g->codeAppend ("EndPrimitive();"); |
| |
| return 6; |
| } |
| |
| void PrimitiveProcessor::emitEdgeDistanceEquation(GrGLSLGeometryBuilder* g, |
| const char* leftPt, const char* rightPt, |
| const char* outputDistanceEquation) const { |
| // Which quadrant does the vector from left -> right fall into? |
| g->codeAppendf("highp vec2 qlr = sign(%s - %s);", rightPt, leftPt); |
| g->codeAppend ("highp vec2 d1 = vec2(qlr.y, -qlr.x);"); |
| |
| g->codeAppendf("highp vec2 n = vec2(%s.y - %s.y, %s.x - %s.x);", |
| rightPt, leftPt, leftPt, rightPt); |
| g->codeAppendf("highp vec2 kk = n * mat2(%s + bloat * d1, %s - bloat * d1);", leftPt, leftPt); |
| // Clamp for when n=0. wind=0 when n=0 so as long as we don't get Inf or NaN we are fine. |
| g->codeAppendf("highp float scale = 1 / max(kk[0] - kk[1], 1e-30);"); |
| |
| g->codeAppendf("%s = vec3(-n, kk[1]) * scale;", outputDistanceEquation); |
| } |
| |
| void PrimitiveProcessor::emitCoverage(const GrCCPRCoverageProcessor& proc, GrGLSLFragmentBuilder* f, |
| const char* outputColor, const char* outputCoverage) const { |
| switch (fCoverageType) { |
| case CoverageType::kOne: |
| f->codeAppendf("%s.a = %s;", outputColor, fFragWind.fsIn()); |
| break; |
| case CoverageType::kInterpolated: |
| f->codeAppendf("%s.a = %s;", outputColor, fFragCoverageTimesWind.fsIn()); |
| break; |
| case CoverageType::kShader: |
| f->codeAppendf("mediump float coverage = 0;"); |
| this->emitShaderCoverage(f, "coverage"); |
| f->codeAppendf("%s.a = coverage * %s;", outputColor, fFragWind.fsIn()); |
| break; |
| } |
| |
| f->codeAppendf("%s = vec4(1);", outputCoverage); |
| |
| #ifdef SK_DEBUG |
| if (proc.debugVisualizations()) { |
| f->codeAppendf("%s = vec4(-%s.a, %s.a, 0, 1);", outputColor, outputColor, outputColor); |
| } |
| #endif |
| } |
| |
| int PrimitiveProcessor::defineSoftSampleLocations(GrGLSLFragmentBuilder* f, |
| const char* samplesName) const { |
| // Standard DX11 sample locations. |
| #if defined(SK_BUILD_FOR_ANDROID) || defined(SK_BUILD_FOR_IOS) |
| f->defineConstant("highp vec2[8]", samplesName, "vec2[8](" |
| "vec2(+1, -3)/16, vec2(-1, +3)/16, vec2(+5, +1)/16, vec2(-3, -5)/16, " |
| "vec2(-5, +5)/16, vec2(-7, -1)/16, vec2(+3, +7)/16, vec2(+7, -7)/16." |
| ")"); |
| return 8; |
| #else |
| f->defineConstant("highp vec2[16]", samplesName, "vec2[16](" |
| "vec2(+1, +1)/16, vec2(-1, -3)/16, vec2(-3, +2)/16, vec2(+4, -1)/16, " |
| "vec2(-5, -2)/16, vec2(+2, +5)/16, vec2(+5, +3)/16, vec2(+3, -5)/16, " |
| "vec2(-2, +6)/16, vec2( 0, -7)/16, vec2(-4, -6)/16, vec2(-6, +4)/16, " |
| "vec2(-8, 0)/16, vec2(+7, -4)/16, vec2(+6, +7)/16, vec2(-7, -8)/16." |
| ")"); |
| return 16; |
| #endif |
| } |
| |
| #ifdef SK_DEBUG |
| |
| #include "GrRenderTarget.h" |
| |
| void GrCCPRCoverageProcessor::Validate(GrRenderTarget* atlasTexture) { |
| SkASSERT(kAtlasOrigin == atlasTexture->origin()); |
| SkASSERT(GrPixelConfigIsAlphaOnly(atlasTexture->config())); |
| SkASSERT(GrPixelConfigIsFloatingPoint(atlasTexture->config())); |
| } |
| |
| #endif |
