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| 1 /* | |
| 2 * Copyright 2013 Google Inc. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 #ifndef GrGLGeometryProcessor_DEFINED | |
| 9 #define GrGLGeometryProcessor_DEFINED | |
| 10 | |
| 11 #include "GrGLPrimitiveProcessor.h" | |
| 12 | |
| 13 class GrGLSLGPBuilder; | |
| 14 | |
| 15 /** | |
| 16 * If a GL effect needs a GrGLFullShaderBuilder* object to emit vertex code, the
n it must inherit | |
| 17 * from this class. Since paths don't have vertices, this class is only meant to
be used internally | |
| 18 * by skia, for special cases. | |
| 19 */ | |
| 20 class GrGLGeometryProcessor : public GrGLPrimitiveProcessor { | |
| 21 public: | |
| 22 /* Any general emit code goes in the base class emitCode. Subclasses overri
de onEmitCode */ | |
| 23 void emitCode(EmitArgs&) override; | |
| 24 | |
| 25 // By default we use the identity matrix | |
| 26 void setTransformData(const GrPrimitiveProcessor&, | |
| 27 const GrGLSLProgramDataManager& pdman, | |
| 28 int index, | |
| 29 const SkTArray<const GrCoordTransform*, true>& transfo
rms) override { | |
| 30 this->setTransformDataMatrix(SkMatrix::I(), pdman, index, transforms); | |
| 31 } | |
| 32 | |
| 33 // A helper which subclasses can use if needed | |
| 34 template <class GeometryProcessor> | |
| 35 void setTransformDataHelper(const GrPrimitiveProcessor& primProc, | |
| 36 const GrGLSLProgramDataManager& pdman, | |
| 37 int index, | |
| 38 const SkTArray<const GrCoordTransform*, true>& t
ransforms) { | |
| 39 const GeometryProcessor& gp = primProc.cast<GeometryProcessor>(); | |
| 40 this->setTransformDataMatrix(gp.localMatrix(), pdman, index, transforms)
; | |
| 41 } | |
| 42 | |
| 43 protected: | |
| 44 // Emit a uniform matrix for each coord transform. | |
| 45 void emitTransforms(GrGLSLGPBuilder* gp, | |
| 46 const GrShaderVar& posVar, | |
| 47 const char* localCoords, | |
| 48 const TransformsIn& tin, | |
| 49 TransformsOut* tout) { | |
| 50 this->emitTransforms(gp, posVar, localCoords, SkMatrix::I(), tin, tout); | |
| 51 } | |
| 52 | |
| 53 // Emit pre-transformed coords as a vertex attribute per coord-transform. | |
| 54 void emitTransforms(GrGLSLGPBuilder*, | |
| 55 const GrShaderVar& posVar, | |
| 56 const char* localCoords, | |
| 57 const SkMatrix& localMatrix, | |
| 58 const TransformsIn&, | |
| 59 TransformsOut*); | |
| 60 | |
| 61 // caller has emitted transforms via attributes | |
| 62 void emitTransforms(GrGLSLGPBuilder*, | |
| 63 const char* localCoords, | |
| 64 const TransformsIn& tin, | |
| 65 TransformsOut* tout); | |
| 66 | |
| 67 struct GrGPArgs { | |
| 68 // The variable used by a GP to store its position. It can be | |
| 69 // either a vec2 or a vec3 depending on the presence of perspective. | |
| 70 GrShaderVar fPositionVar; | |
| 71 }; | |
| 72 | |
| 73 // Create the correct type of position variable given the CTM | |
| 74 void setupPosition(GrGLSLGPBuilder*, GrGPArgs*, const char* posName); | |
| 75 void setupPosition(GrGLSLGPBuilder*, GrGPArgs*, const char* posName, const S
kMatrix& mat, | |
| 76 UniformHandle* viewMatrixUniform); | |
| 77 | |
| 78 static uint32_t ComputePosKey(const SkMatrix& mat) { | |
| 79 if (mat.isIdentity()) { | |
| 80 return 0x0; | |
| 81 } else if (!mat.hasPerspective()) { | |
| 82 return 0x01; | |
| 83 } else { | |
| 84 return 0x02; | |
| 85 } | |
| 86 } | |
| 87 | |
| 88 private: | |
| 89 void setTransformDataMatrix(const SkMatrix& localMatrix, | |
| 90 const GrGLSLProgramDataManager& pdman, | |
| 91 int index, | |
| 92 const SkTArray<const GrCoordTransform*, true>& t
ransforms) { | |
| 93 SkSTArray<2, Transform, true>& procTransforms = fInstalledTransforms[ind
ex]; | |
| 94 int numTransforms = transforms.count(); | |
| 95 for (int t = 0; t < numTransforms; ++t) { | |
| 96 SkASSERT(procTransforms[t].fHandle.isValid()); | |
| 97 const SkMatrix& transform = GetTransformMatrix(localMatrix, *transfo
rms[t]); | |
| 98 if (!procTransforms[t].fCurrentValue.cheapEqualTo(transform)) { | |
| 99 pdman.setSkMatrix(procTransforms[t].fHandle.toIndex(), transform
); | |
| 100 procTransforms[t].fCurrentValue = transform; | |
| 101 } | |
| 102 } | |
| 103 } | |
| 104 | |
| 105 virtual void onEmitCode(EmitArgs&, GrGPArgs*) = 0; | |
| 106 | |
| 107 typedef GrGLPrimitiveProcessor INHERITED; | |
| 108 }; | |
| 109 | |
| 110 #endif | |
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Chromium Code Reviews
Issue 1441683008:
Move GrGLPrimitive/GeometryProc to GLSL (Closed)
Base URL: https://skia.googlesource.com/skia.git@xferProcs