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Diffstat (limited to 'src/gpu/ccpr/GrCCCubicShader.cpp')
-rw-r--r--src/gpu/ccpr/GrCCCubicShader.cpp118
1 files changed, 22 insertions, 96 deletions
diff --git a/src/gpu/ccpr/GrCCCubicShader.cpp b/src/gpu/ccpr/GrCCCubicShader.cpp
index 5ae51c7d9b..76d1646b65 100644
--- a/src/gpu/ccpr/GrCCCubicShader.cpp
+++ b/src/gpu/ccpr/GrCCCubicShader.cpp
@@ -13,8 +13,8 @@
using Shader = GrCCCoverageProcessor::Shader;
void GrCCCubicShader::emitSetupCode(GrGLSLVertexGeoBuilder* s, const char* pts,
- const char* repetitionID, const char* wind,
- GeometryVars* vars) const {
+ const char* /*repetitionID*/, const char* /*wind*/,
+ GeometryVars*) const {
// Find the cubic's power basis coefficients.
s->codeAppendf("float2x4 C = float4x4(-1, 3, -3, 1, "
" 3, -6, 3, 0, "
@@ -58,118 +58,44 @@ void GrCCCubicShader::emitSetupCode(GrGLSLVertexGeoBuilder* s, const char* pts,
// Evaluate the cubic at T=.5 for a mid-ish point.
s->codeAppendf("float2 midpoint = %s * float4(.125, .375, .375, .125);", pts);
- // Orient the KLM matrix so L & M have matching signs on the side of the curve we wish to fill.
- // We give L & M both the same sign as wind, in order to pass this value to the fragment shader.
- // (Cubics are pre-chopped such that L & M do not change sign within any individual segment).
+ // Orient the KLM matrix so L & M are both positive on the side of the curve we wish to fill.
s->codeAppendf("float2 orientation = sign(float3(midpoint, 1) * float2x3(%s[1], %s[2]));",
fKLMMatrix.c_str(), fKLMMatrix.c_str());
s->codeAppendf("%s *= float3x3(orientation[0] * orientation[1], 0, 0, "
- "0, orientation[0] * %s, 0, "
- "0, 0, orientation[1] * %s);", fKLMMatrix.c_str(), wind, wind);
-
- // Determine the amount of additional coverage to subtract out for the flat edge (P3 -> P0).
- s->declareGlobal(fEdgeDistanceEquation);
- s->codeAppendf("short edgeidx0 = %s > 0 ? 3 : 0;", wind);
- s->codeAppendf("float2 edgept0 = %s[edgeidx0];", pts);
- s->codeAppendf("float2 edgept1 = %s[3 - edgeidx0];", pts);
- Shader::EmitEdgeDistanceEquation(s, "edgept0", "edgept1", fEdgeDistanceEquation.c_str());
-
- this->onEmitSetupCode(s, pts, repetitionID, vars);
+ "0, orientation[0], 0, "
+ "0, 0, orientation[1]);", fKLMMatrix.c_str());
}
void GrCCCubicShader::onEmitVaryings(GrGLSLVaryingHandler* varyingHandler,
GrGLSLVarying::Scope scope, SkString* code,
const char* position, const char* inputCoverage,
- const char* /*wind*/) {
- SkASSERT(!inputCoverage);
-
- fKLMD.reset(kFloat4_GrSLType, scope);
- varyingHandler->addVarying("klmd", &fKLMD);
+ const char* wind) {
code->appendf("float3 klm = float3(%s, 1) * %s;", position, fKLMMatrix.c_str());
- code->appendf("float d = dot(float3(%s, 1), %s);", position, fEdgeDistanceEquation.c_str());
- code->appendf("%s = float4(klm, d);", OutName(fKLMD));
-
- this->onEmitVaryings(varyingHandler, scope, code);
-}
-void GrCCCubicShader::onEmitFragmentCode(GrGLSLFPFragmentBuilder* f,
- const char* outputCoverage) const {
- f->codeAppendf("float k = %s.x, l = %s.y, m = %s.z, d = %s.w;",
- fKLMD.fsIn(), fKLMD.fsIn(), fKLMD.fsIn(), fKLMD.fsIn());
-
- this->emitCoverage(f, outputCoverage);
+ fKLMW.reset(kFloat4_GrSLType, scope);
+ varyingHandler->addVarying("klmw", &fKLMW);
+ code->appendf("%s.xyz = klm;", OutName(fKLMW));
+ code->appendf("%s.w = %s * %s;", OutName(fKLMW), inputCoverage, wind);
- // Wind is the sign of both L and/or M. Take the sign of whichever has the larger magnitude.
- // (In reality, either would be fine because we chop cubics with more than a half pixel of
- // padding around the L & M lines, so neither should approach zero.)
- f->codeAppend ("half wind = sign(l + m);");
- f->codeAppendf("%s *= wind;", outputCoverage);
-}
-
-void GrCCCubicHullShader::onEmitVaryings(GrGLSLVaryingHandler* varyingHandler,
- GrGLSLVarying::Scope scope, SkString* code) {
fGradMatrix.reset(kFloat2x2_GrSLType, scope);
varyingHandler->addVarying("grad_matrix", &fGradMatrix);
- // "klm" was just defined by the base class.
code->appendf("%s[0] = 3 * klm[0] * %s[0].xy;", OutName(fGradMatrix), fKLMMatrix.c_str());
code->appendf("%s[1] = -klm[1] * %s[2].xy - klm[2] * %s[1].xy;",
OutName(fGradMatrix), fKLMMatrix.c_str(), fKLMMatrix.c_str());
}
-void GrCCCubicHullShader::emitCoverage(GrGLSLFPFragmentBuilder* f,
- const char* outputCoverage) const {
- // k,l,m,d are defined by the base class.
- f->codeAppend ("float f = k*k*k - l*m;");
- f->codeAppendf("float2 grad_f = %s * float2(k, 1);", fGradMatrix.fsIn());
- f->codeAppendf("%s = clamp(0.5 - f * inversesqrt(dot(grad_f, grad_f)), 0, 1);", outputCoverage);
- f->codeAppendf("%s += min(d, 0);", outputCoverage); // Flat edge opposite the curve.
-}
-
-void GrCCCubicCornerShader::onEmitSetupCode(GrGLSLVertexGeoBuilder* s, const char* pts,
- const char* repetitionID, GeometryVars* vars) const {
- s->codeAppendf("float2 corner = %s[%s * 3];", pts, repetitionID);
- vars->fCornerVars.fPoint = "corner";
-}
-
-void GrCCCubicCornerShader::onEmitVaryings(GrGLSLVaryingHandler* varyingHandler,
- GrGLSLVarying::Scope scope, SkString* code) {
- using Interpolation = GrGLSLVaryingHandler::Interpolation;
-
- fdKLMDdx.reset(kFloat4_GrSLType, scope);
- varyingHandler->addVarying("dklmddx", &fdKLMDdx, Interpolation::kCanBeFlat);
- code->appendf("%s = float4(%s[0].x, %s[1].x, %s[2].x, %s.x);",
- OutName(fdKLMDdx), fKLMMatrix.c_str(), fKLMMatrix.c_str(),
- fKLMMatrix.c_str(), fEdgeDistanceEquation.c_str());
-
- fdKLMDdy.reset(kFloat4_GrSLType, scope);
- varyingHandler->addVarying("dklmddy", &fdKLMDdy, Interpolation::kCanBeFlat);
- code->appendf("%s = float4(%s[0].y, %s[1].y, %s[2].y, %s.y);",
- OutName(fdKLMDdy), fKLMMatrix.c_str(), fKLMMatrix.c_str(),
- fKLMMatrix.c_str(), fEdgeDistanceEquation.c_str());
-}
-
-void GrCCCubicCornerShader::emitCoverage(GrGLSLFPFragmentBuilder* f,
+void GrCCCubicShader::onEmitFragmentCode(const GrCCCoverageProcessor& proc,
+ GrGLSLFPFragmentBuilder* f,
const char* outputCoverage) const {
- f->codeAppendf("float2x4 grad_klmd = float2x4(%s, %s);", fdKLMDdx.fsIn(), fdKLMDdy.fsIn());
-
- // Erase what the previous hull shader wrote. We don't worry about the two corners falling on
- // the same pixel because those cases should have been weeded out by this point.
- // k,l,m,d are defined by the base class.
+ f->codeAppendf("float k = %s.x, l = %s.y, m = %s.z;",
+ fKLMW.fsIn(), fKLMW.fsIn(), fKLMW.fsIn());
f->codeAppend ("float f = k*k*k - l*m;");
- f->codeAppend ("float2 grad_f = float3(3*k*k, -m, -l) * float2x3(grad_klmd);");
- f->codeAppendf("%s = -clamp(0.5 - f * inversesqrt(dot(grad_f, grad_f)), 0, 1);",
- outputCoverage);
- f->codeAppendf("%s -= d;", outputCoverage);
-
- // Use software msaa to estimate actual coverage at the corner pixels.
- const int sampleCount = Shader::DefineSoftSampleLocations(f, "samples");
- f->codeAppendf("float4 klmd_center = float4(%s.xyz, %s.w + 0.5);",
- fKLMD.fsIn(), fKLMD.fsIn());
- f->codeAppendf("for (int i = 0; i < %i; ++i) {", sampleCount);
- f->codeAppend ( "float4 klmd = grad_klmd * samples[i] + klmd_center;");
- f->codeAppend ( "half f = klmd.y * klmd.z - klmd.x * klmd.x * klmd.x;");
- f->codeAppendf( "%s += all(greaterThan(half4(f, klmd.y, klmd.z, klmd.w), "
- "half4(0))) ? %f : 0;",
- outputCoverage, 1.0 / sampleCount);
- f->codeAppend ("}");
+ f->codeAppendf("float2 grad_f = %s * float2(k, 1);", fGradMatrix.fsIn());
+ f->codeAppend ("float d = f * inversesqrt(dot(grad_f, grad_f));");
+#ifdef SK_DEBUG
+ if (proc.debugVisualizationsEnabled()) {
+ f->codeAppendf("d /= %f;", proc.debugBloat());
+ }
+#endif
+ f->codeAppendf("%s = clamp(0.5 - d, 0, 1) * %s.w;", outputCoverage, fKLMW.fsIn());
}
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