CCPR: Rename GrCCPR* -> GrCC*
Also runs clang-format on the files that don't have special shader
builder styling.
Bug: skia:
Change-Id: I4a67569a7c8472acfb9200644c913844a92e3b2d
Reviewed-on: https://skia-review.googlesource.com/92083
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/src/gpu/ccpr/GrCCPathProcessor.cpp b/src/gpu/ccpr/GrCCPathProcessor.cpp
new file mode 100644
index 0000000..66005f1
--- /dev/null
+++ b/src/gpu/ccpr/GrCCPathProcessor.cpp
@@ -0,0 +1,210 @@
+/*
+ * 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 "GrCCPathProcessor.h"
+
+#include "GrOnFlushResourceProvider.h"
+#include "GrTexture.h"
+#include "glsl/GrGLSLFragmentShaderBuilder.h"
+#include "glsl/GrGLSLGeometryProcessor.h"
+#include "glsl/GrGLSLProgramBuilder.h"
+#include "glsl/GrGLSLVarying.h"
+
+// Slightly undershoot an AA bloat radius of 0.5 so vertices that fall on integer boundaries don't
+// accidentally reach into neighboring path masks within the atlas.
+constexpr float kAABloatRadius = 0.491111f;
+
+// Paths are drawn as octagons. Each point on the octagon is the intersection of two lines: one edge
+// from the path's bounding box and one edge from its 45-degree bounding box. The below inputs
+// define a vertex by the two edges that need to be intersected. Normals point out of the octagon,
+// and the bounding boxes are sent in as instance attribs.
+static constexpr float kOctoEdgeNorms[8 * 4] = {
+ // bbox // bbox45
+ -1, 0, -1,+1,
+ -1, 0, -1,-1,
+ 0,-1, -1,-1,
+ 0,-1, +1,-1,
+ +1, 0, +1,-1,
+ +1, 0, +1,+1,
+ 0,+1, +1,+1,
+ 0,+1, -1,+1,
+};
+
+GR_DECLARE_STATIC_UNIQUE_KEY(gVertexBufferKey);
+
+sk_sp<const GrBuffer> GrCCPathProcessor::FindVertexBuffer(GrOnFlushResourceProvider* onFlushRP) {
+ GR_DEFINE_STATIC_UNIQUE_KEY(gVertexBufferKey);
+ return onFlushRP->findOrMakeStaticBuffer(kVertex_GrBufferType, sizeof(kOctoEdgeNorms),
+ kOctoEdgeNorms, gVertexBufferKey);
+}
+
+// Index buffer for the octagon defined above.
+static uint16_t kOctoIndices[GrCCPathProcessor::kPerInstanceIndexCount] = {
+ 0, 4, 2,
+ 0, 6, 4,
+ 0, 2, 1,
+ 2, 4, 3,
+ 4, 6, 5,
+ 6, 0, 7,
+};
+
+GR_DECLARE_STATIC_UNIQUE_KEY(gIndexBufferKey);
+
+sk_sp<const GrBuffer> GrCCPathProcessor::FindIndexBuffer(GrOnFlushResourceProvider* onFlushRP) {
+ GR_DEFINE_STATIC_UNIQUE_KEY(gIndexBufferKey);
+ return onFlushRP->findOrMakeStaticBuffer(kIndex_GrBufferType, sizeof(kOctoIndices),
+ kOctoIndices, gIndexBufferKey);
+}
+
+GrCCPathProcessor::GrCCPathProcessor(GrResourceProvider* rp, sk_sp<GrTextureProxy> atlas,
+ SkPath::FillType fillType, const GrShaderCaps& shaderCaps)
+ : INHERITED(kGrCCPathProcessor_ClassID)
+ , fFillType(fillType)
+ , fAtlasAccess(std::move(atlas), GrSamplerState::Filter::kNearest,
+ GrSamplerState::WrapMode::kClamp, kFragment_GrShaderFlag) {
+ this->addInstanceAttrib("devbounds", kFloat4_GrVertexAttribType);
+ this->addInstanceAttrib("devbounds45", kFloat4_GrVertexAttribType);
+ this->addInstanceAttrib("view_matrix", kFloat4_GrVertexAttribType);
+ this->addInstanceAttrib("view_translate", kFloat2_GrVertexAttribType);
+ this->addInstanceAttrib("atlas_offset", kShort2_GrVertexAttribType);
+ this->addInstanceAttrib("color", kUByte4_norm_GrVertexAttribType);
+
+ SkASSERT(offsetof(Instance, fDevBounds) ==
+ this->getInstanceAttrib(InstanceAttribs::kDevBounds).fOffsetInRecord);
+ SkASSERT(offsetof(Instance, fDevBounds45) ==
+ this->getInstanceAttrib(InstanceAttribs::kDevBounds45).fOffsetInRecord);
+ SkASSERT(offsetof(Instance, fViewMatrix) ==
+ this->getInstanceAttrib(InstanceAttribs::kViewMatrix).fOffsetInRecord);
+ SkASSERT(offsetof(Instance, fViewTranslate) ==
+ this->getInstanceAttrib(InstanceAttribs::kViewTranslate).fOffsetInRecord);
+ SkASSERT(offsetof(Instance, fAtlasOffset) ==
+ this->getInstanceAttrib(InstanceAttribs::kAtlasOffset).fOffsetInRecord);
+ SkASSERT(offsetof(Instance, fColor) ==
+ this->getInstanceAttrib(InstanceAttribs::kColor).fOffsetInRecord);
+ SkASSERT(sizeof(Instance) == this->getInstanceStride());
+
+ GR_STATIC_ASSERT(6 == kNumInstanceAttribs);
+
+ this->addVertexAttrib("edge_norms", kFloat4_GrVertexAttribType);
+
+ fAtlasAccess.instantiate(rp);
+ this->addTextureSampler(&fAtlasAccess);
+}
+
+void GrCCPathProcessor::getGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder* b) const {
+ b->add32((fFillType << 16) | this->atlasProxy()->origin());
+}
+
+class GLSLPathProcessor : public GrGLSLGeometryProcessor {
+public:
+ void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override;
+
+private:
+ void setData(const GrGLSLProgramDataManager& pdman, const GrPrimitiveProcessor& primProc,
+ FPCoordTransformIter&& transformIter) override {
+ const GrCCPathProcessor& proc = primProc.cast<GrCCPathProcessor>();
+ pdman.set2f(fAtlasAdjustUniform, 1.0f / proc.atlas()->width(),
+ 1.0f / proc.atlas()->height());
+ this->setTransformDataHelper(SkMatrix::I(), pdman, &transformIter);
+ }
+
+ GrGLSLUniformHandler::UniformHandle fAtlasAdjustUniform;
+
+ typedef GrGLSLGeometryProcessor INHERITED;
+};
+
+GrGLSLPrimitiveProcessor* GrCCPathProcessor::createGLSLInstance(const GrShaderCaps&) const {
+ return new GLSLPathProcessor();
+}
+
+void GLSLPathProcessor::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) {
+ using InstanceAttribs = GrCCPathProcessor::InstanceAttribs;
+ const GrCCPathProcessor& proc = args.fGP.cast<GrCCPathProcessor>();
+ GrGLSLUniformHandler* uniHandler = args.fUniformHandler;
+ GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;
+
+ const char* atlasAdjust;
+ fAtlasAdjustUniform = uniHandler->addUniform(
+ kVertex_GrShaderFlag,
+ kFloat2_GrSLType, "atlas_adjust", &atlasAdjust);
+
+ varyingHandler->emitAttributes(proc);
+
+ GrGLSLVarying texcoord(kFloat2_GrSLType);
+ GrGLSLVarying color(kHalf4_GrSLType);
+ varyingHandler->addVarying("texcoord", &texcoord);
+ varyingHandler->addFlatPassThroughAttribute(&proc.getInstanceAttrib(InstanceAttribs::kColor),
+ args.fOutputColor);
+
+ // The vertex shader bloats and intersects the devBounds and devBounds45 rectangles, in order to
+ // find an octagon that circumscribes the (bloated) path.
+ GrGLSLVertexBuilder* v = args.fVertBuilder;
+
+ // Each vertex is the intersection of one edge from devBounds and one from devBounds45.
+ // 'N' holds the normals to these edges as column vectors.
+ //
+ // NOTE: "float2x2(float4)" is valid and equivalent to "float2x2(float4.xy, float4.zw)",
+ // however Intel compilers crash when we use the former syntax in this shader.
+ v->codeAppendf("float2x2 N = float2x2(%s.xy, %s.zw);",
+ proc.getEdgeNormsAttrib().fName, proc.getEdgeNormsAttrib().fName);
+
+ // N[0] is the normal for the edge we are intersecting from the regular bounding box, pointing
+ // out of the octagon.
+ v->codeAppendf("float2 refpt = (min(N[0].x, N[0].y) < 0) ? %s.xy : %s.zw;",
+ proc.getInstanceAttrib(InstanceAttribs::kDevBounds).fName,
+ proc.getInstanceAttrib(InstanceAttribs::kDevBounds).fName);
+ v->codeAppendf("refpt += N[0] * %f;", kAABloatRadius); // bloat for AA.
+
+ // N[1] is the normal for the edge we are intersecting from the 45-degree bounding box, pointing
+ // out of the octagon.
+ v->codeAppendf("float2 refpt45 = (N[1].x < 0) ? %s.xy : %s.zw;",
+ proc.getInstanceAttrib(InstanceAttribs::kDevBounds45).fName,
+ proc.getInstanceAttrib(InstanceAttribs::kDevBounds45).fName);
+ v->codeAppendf("refpt45 *= float2x2(.5,.5,-.5,.5);"); // transform back to device space.
+ v->codeAppendf("refpt45 += N[1] * %f;", kAABloatRadius); // bloat for AA.
+
+ v->codeAppend ("float2 K = float2(dot(N[0], refpt), dot(N[1], refpt45));");
+ v->codeAppendf("float2 octocoord = K * inverse(N);");
+
+ gpArgs->fPositionVar.set(kFloat2_GrSLType, "octocoord");
+
+ // Convert to atlas coordinates in order to do our texture lookup.
+ v->codeAppendf("float2 atlascoord = octocoord + float2(%s);",
+ proc.getInstanceAttrib(InstanceAttribs::kAtlasOffset).fName);
+ if (kTopLeft_GrSurfaceOrigin == proc.atlasProxy()->origin()) {
+ v->codeAppendf("%s = atlascoord * %s;", texcoord.vsOut(), atlasAdjust);
+ } else {
+ SkASSERT(kBottomLeft_GrSurfaceOrigin == proc.atlasProxy()->origin());
+ v->codeAppendf("%s = float2(atlascoord.x * %s.x, 1 - atlascoord.y * %s.y);",
+ texcoord.vsOut(), atlasAdjust, atlasAdjust);
+ }
+
+ // Convert to path/local cordinates.
+ v->codeAppendf("float2x2 viewmatrix = float2x2(%s.xy, %s.zw);", // float2x2(float4) busts Intel.
+ proc.getInstanceAttrib(InstanceAttribs::kViewMatrix).fName,
+ proc.getInstanceAttrib(InstanceAttribs::kViewMatrix).fName);
+ v->codeAppendf("float2 pathcoord = inverse(viewmatrix) * (octocoord - %s);",
+ proc.getInstanceAttrib(InstanceAttribs::kViewTranslate).fName);
+
+ this->emitTransforms(v, varyingHandler, uniHandler, GrShaderVar("pathcoord", kFloat2_GrSLType),
+ args.fFPCoordTransformHandler);
+
+ // Fragment shader.
+ GrGLSLPPFragmentBuilder* f = args.fFragBuilder;
+
+ f->codeAppend ("half coverage_count = ");
+ f->appendTextureLookup(args.fTexSamplers[0], texcoord.fsIn(), kFloat2_GrSLType);
+ f->codeAppend (".a;");
+
+ if (SkPath::kWinding_FillType == proc.fillType()) {
+ f->codeAppendf("%s = half4(min(abs(coverage_count), 1));", args.fOutputCoverage);
+ } else {
+ SkASSERT(SkPath::kEvenOdd_FillType == proc.fillType());
+ f->codeAppend ("half t = mod(abs(coverage_count), 2);");
+ f->codeAppendf("%s = half4(1 - abs(t - 1));", args.fOutputCoverage);
+ }
+}