joshualitt | 4973d9d | 2014-11-08 09:24:25 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2014 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 | #include "GrDefaultGeoProcFactory.h" |
| 9 | |
| 10 | #include "gl/builders/GrGLProgramBuilder.h" |
| 11 | #include "gl/GrGLGeometryProcessor.h" |
| 12 | #include "GrDrawState.h" |
| 13 | #include "GrTBackendProcessorFactory.h" |
| 14 | |
| 15 | /* |
| 16 | * The default Geometry Processor simply takes position and multiplies it by the uniform view |
| 17 | * matrix. It also leaves coverage untouched. Behind the scenes, we may add per vertex color or |
| 18 | * local coords. |
| 19 | */ |
| 20 | class DefaultGeoProc : public GrGeometryProcessor { |
| 21 | public: |
| 22 | static GrGeometryProcessor* Create() { |
| 23 | GR_CREATE_STATIC_PROCESSOR(gDefaultGeoProc, DefaultGeoProc, ()); |
| 24 | return SkRef(gDefaultGeoProc); |
| 25 | } |
| 26 | |
| 27 | static const char* Name() { return "DefaultGeometryProcessor"; } |
| 28 | |
| 29 | virtual const GrBackendGeometryProcessorFactory& getFactory() const SK_OVERRIDE { |
| 30 | return GrTBackendGeometryProcessorFactory<DefaultGeoProc>::getInstance(); |
| 31 | } |
| 32 | |
| 33 | class GLProcessor : public GrGLGeometryProcessor { |
| 34 | public: |
| 35 | GLProcessor(const GrBackendProcessorFactory& factory, const GrProcessor&) |
| 36 | : INHERITED (factory) {} |
| 37 | |
| 38 | virtual void emitCode(const EmitArgs& args) SK_OVERRIDE { |
| 39 | GrGLVertexBuilder* vs = args.fPB->getVertexShaderBuilder(); |
| 40 | |
| 41 | // setup position varying |
| 42 | vs->codeAppendf("%s = %s * vec3(%s, 1);", vs->glPosition(), vs->uViewM(), |
| 43 | vs->inPosition()); |
| 44 | |
| 45 | // output coverage in FS(pass through) |
| 46 | GrGLGPFragmentBuilder* fs = args.fPB->getFragmentShaderBuilder(); |
| 47 | fs->codeAppendf("%s = %s;", args.fOutput, GrGLSLExpr4(args.fInput).c_str()); |
| 48 | } |
| 49 | |
| 50 | static inline void GenKey(const GrProcessor&, const GrGLCaps&, GrProcessorKeyBuilder*) {} |
| 51 | |
| 52 | virtual void setData(const GrGLProgramDataManager&, const GrProcessor&) SK_OVERRIDE {} |
| 53 | |
| 54 | private: |
| 55 | typedef GrGLGeometryProcessor INHERITED; |
| 56 | }; |
| 57 | |
| 58 | private: |
| 59 | DefaultGeoProc() {} |
| 60 | |
| 61 | virtual bool onIsEqual(const GrGeometryProcessor& other) const SK_OVERRIDE { |
| 62 | return true; |
| 63 | } |
| 64 | |
| 65 | virtual void onComputeInvariantOutput(InvariantOutput* inout) const SK_OVERRIDE { |
| 66 | inout->mulByUnknownAlpha(); |
| 67 | } |
| 68 | |
| 69 | GR_DECLARE_GEOMETRY_PROCESSOR_TEST; |
| 70 | |
| 71 | typedef GrFragmentProcessor INHERITED; |
| 72 | }; |
| 73 | |
| 74 | GR_DEFINE_GEOMETRY_PROCESSOR_TEST(DefaultGeoProc); |
| 75 | |
| 76 | GrGeometryProcessor* DefaultGeoProc::TestCreate(SkRandom* random, |
| 77 | GrContext*, |
| 78 | const GrDrawTargetCaps& caps, |
| 79 | GrTexture*[]) { |
| 80 | return DefaultGeoProc::Create(); |
| 81 | } |
| 82 | |
| 83 | // We use these arrays to customize our default GP. We only need 4 because we omit coverage if |
| 84 | // coverage is not requested in the flags to the create function. |
| 85 | GrVertexAttrib kDefaultPositionGeoProc[] = { |
| 86 | { kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding }, |
| 87 | { kVec4ub_GrVertexAttribType, sizeof(SkPoint), kCoverage_GrVertexAttribBinding }, |
| 88 | }; |
| 89 | |
| 90 | GrVertexAttrib kDefaultPosColorGeoProc[] = { |
| 91 | { kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding }, |
| 92 | { kVec4ub_GrVertexAttribType, sizeof(SkPoint), kColor_GrVertexAttribBinding }, |
| 93 | { kVec4ub_GrVertexAttribType, sizeof(SkPoint) + sizeof(GrColor), kCoverage_GrVertexAttribBinding }, |
| 94 | }; |
| 95 | |
| 96 | GrVertexAttrib kDefaultPosUVGeoProc[] = { |
| 97 | { kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding }, |
| 98 | { kVec2f_GrVertexAttribType, sizeof(SkPoint), kLocalCoord_GrVertexAttribBinding }, |
| 99 | { kVec4ub_GrVertexAttribType, 2 * sizeof(SkPoint), kCoverage_GrVertexAttribBinding }, |
| 100 | }; |
| 101 | |
| 102 | GrVertexAttrib kDefaultPosColUVGeoProc[] = { |
| 103 | { kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding }, |
| 104 | { kVec4ub_GrVertexAttribType, sizeof(SkPoint), kColor_GrVertexAttribBinding }, |
| 105 | { kVec2f_GrVertexAttribType, sizeof(SkPoint) + sizeof(GrColor), kLocalCoord_GrVertexAttribBinding }, |
| 106 | { kVec4ub_GrVertexAttribType, 2 * sizeof(SkPoint) + sizeof(GrColor), kCoverage_GrVertexAttribBinding }, |
| 107 | }; |
| 108 | |
| 109 | static size_t get_size(GrDefaultGeoProcFactory::GPType flag) { |
| 110 | switch (flag) { |
| 111 | case GrDefaultGeoProcFactory::kPosition_GPType: |
| 112 | return GrVertexAttribTypeSize(kVec2f_GrVertexAttribType); |
| 113 | case GrDefaultGeoProcFactory::kColor_GPType: |
| 114 | return GrVertexAttribTypeSize(kVec4ub_GrVertexAttribType); |
| 115 | case GrDefaultGeoProcFactory::kLocalCoord_GPType: |
| 116 | return GrVertexAttribTypeSize(kVec2f_GrVertexAttribType); |
| 117 | case GrDefaultGeoProcFactory::kCoverage_GPType: |
| 118 | return GrVertexAttribTypeSize(kVec4ub_GrVertexAttribType); |
| 119 | default: |
| 120 | SkFAIL("Should never get here"); |
| 121 | return 0; |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | const GrGeometryProcessor* |
| 126 | GrDefaultGeoProcFactory::CreateAndSetAttribs(GrDrawState* ds, uint32_t gpTypeFlags) { |
| 127 | SkASSERT(ds); |
| 128 | // always atleast position in the GP |
| 129 | size_t size = get_size(kPosition_GPType); |
| 130 | int count = 1; |
| 131 | |
| 132 | bool hasColor = SkToBool(gpTypeFlags & kColor_GPType); |
| 133 | bool hasLocalCoord = SkToBool(gpTypeFlags & kLocalCoord_GPType); |
| 134 | bool hasCoverage = SkToBool(gpTypeFlags & kCoverage_GPType); |
| 135 | |
| 136 | if (hasColor) { |
| 137 | size += get_size(kColor_GPType); |
| 138 | count++; |
| 139 | if (hasLocalCoord) { |
| 140 | size += get_size(kLocalCoord_GPType); |
| 141 | count++; |
| 142 | if (hasCoverage) { |
| 143 | size += get_size(kCoverage_GPType); |
| 144 | count++; |
| 145 | ds->setVertexAttribs<kDefaultPosColUVGeoProc>(count, size); |
| 146 | } else { |
| 147 | ds->setVertexAttribs<kDefaultPosColUVGeoProc>(count, size); |
| 148 | |
| 149 | } |
| 150 | } else { |
| 151 | if (hasCoverage) { |
| 152 | size += get_size(kCoverage_GPType); |
| 153 | count++; |
| 154 | ds->setVertexAttribs<kDefaultPosColorGeoProc>(count, size); |
| 155 | } else { |
| 156 | ds->setVertexAttribs<kDefaultPosColorGeoProc>(count, size); |
| 157 | } |
| 158 | } |
| 159 | } else if (hasLocalCoord) { |
| 160 | size += get_size(kLocalCoord_GPType); |
| 161 | count++; |
| 162 | if (hasCoverage) { |
| 163 | size += get_size(kCoverage_GPType); |
| 164 | count++; |
| 165 | ds->setVertexAttribs<kDefaultPosUVGeoProc>(count, size); |
| 166 | } else { |
| 167 | ds->setVertexAttribs<kDefaultPosUVGeoProc>(count, size); |
| 168 | } |
| 169 | } else if (hasCoverage) { |
| 170 | size += get_size(kCoverage_GPType); |
| 171 | count++; |
| 172 | ds->setVertexAttribs<kDefaultPositionGeoProc>(count, size); |
| 173 | } else { |
| 174 | // Just position |
| 175 | ds->setVertexAttribs<kDefaultPositionGeoProc>(count, size); |
| 176 | } |
| 177 | return DefaultGeoProc::Create(); |
| 178 | } |
| 179 | |
| 180 | const GrGeometryProcessor* GrDefaultGeoProcFactory::Create() { |
| 181 | return DefaultGeoProc::Create(); |
| 182 | } |