/* * Copyright 2010 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #include "GrDrawTarget.h" #include "GrGpuVertex.h" #include "GrIndexBuffer.h" #include "GrRenderTarget.h" #include "GrTexture.h" #include "GrVertexBuffer.h" namespace { /** * This function generates some masks that we like to have known at compile * time. When the number of stages or tex coords is bumped or the way bits * are defined in GrDrawTarget.h changes this funcion should be rerun to * generate the new masks. (We attempted to force the compiler to generate the * masks using recursive templates but always wound up with static initializers * under gcc, even if they were just a series of immediate->memory moves.) * */ void gen_mask_arrays(GrVertexLayout* stageTexCoordMasks, GrVertexLayout* stageMasks, GrVertexLayout* texCoordMasks) { for (int s = 0; s < GrDrawState::kNumStages; ++s) { stageTexCoordMasks[s] = 0; for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) { stageTexCoordMasks[s] |= GrDrawTarget::StageTexCoordVertexLayoutBit(s, t); } stageMasks[s] = stageTexCoordMasks[s] | GrDrawTarget::StagePosAsTexCoordVertexLayoutBit(s); } for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) { texCoordMasks[t] = 0; for (int s = 0; s < GrDrawState::kNumStages; ++s) { texCoordMasks[t] |= GrDrawTarget::StageTexCoordVertexLayoutBit(s, t); } } } /** * Run this function to generate the code that declares the global masks. */ void gen_globals() { GrVertexLayout stageTexCoordMasks[GrDrawState::kNumStages]; GrVertexLayout stageMasks[GrDrawState::kNumStages]; GrVertexLayout texCoordMasks[GrDrawState::kMaxTexCoords]; gen_mask_arrays(stageTexCoordMasks, stageMasks, texCoordMasks); GrPrintf("const GrVertexLayout gStageTexCoordMasks[] = {\n"); for (int s = 0; s < GrDrawState::kNumStages; ++s) { GrPrintf(" 0x%x,\n", stageTexCoordMasks[s]); } GrPrintf("};\n"); GrPrintf("GR_STATIC_ASSERT(GrDrawState::kNumStages == GR_ARRAY_COUNT(gStageTexCoordMasks));\n\n"); GrPrintf("const GrVertexLayout gStageMasks[] = {\n"); for (int s = 0; s < GrDrawState::kNumStages; ++s) { GrPrintf(" 0x%x,\n", stageMasks[s]); } GrPrintf("};\n"); GrPrintf("GR_STATIC_ASSERT(GrDrawState::kNumStages == GR_ARRAY_COUNT(gStageMasks));\n\n"); GrPrintf("const GrVertexLayout gTexCoordMasks[] = {\n"); for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) { GrPrintf(" 0x%x,\n", texCoordMasks[t]); } GrPrintf("};\n"); GrPrintf("GR_STATIC_ASSERT(GrDrawState::kMaxTexCoords == GR_ARRAY_COUNT(gTexCoordMasks));\n"); } /* These values were generated by the above function */ const GrVertexLayout gStageTexCoordMasks[] = { 0x49, 0x92, 0x124 }; GR_STATIC_ASSERT(GrDrawState::kNumStages == GR_ARRAY_COUNT(gStageTexCoordMasks)); const GrVertexLayout gStageMasks[] = { 0x249, 0x492, 0x924 }; GR_STATIC_ASSERT(GrDrawState::kNumStages == GR_ARRAY_COUNT(gStageMasks)); const GrVertexLayout gTexCoordMasks[] = { 0x7, 0x38, 0x1c0, }; GR_STATIC_ASSERT(GrDrawState::kMaxTexCoords == GR_ARRAY_COUNT(gTexCoordMasks)); bool check_layout(GrVertexLayout layout) { // can only have 1 or 0 bits set for each stage. for (int s = 0; s < GrDrawState::kNumStages; ++s) { int stageBits = layout & gStageMasks[s]; if (stageBits && !GrIsPow2(stageBits)) { return false; } } return true; } int num_tex_coords(GrVertexLayout layout) { int cnt = 0; // figure out how many tex coordinates are present for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) { if (gTexCoordMasks[t] & layout) { ++cnt; } } return cnt; } } //unnamed namespace size_t GrDrawTarget::VertexSize(GrVertexLayout vertexLayout) { GrAssert(check_layout(vertexLayout)); size_t vecSize = (vertexLayout & kTextFormat_VertexLayoutBit) ? sizeof(GrGpuTextVertex) : sizeof(GrPoint); size_t size = vecSize; // position size += num_tex_coords(vertexLayout) * vecSize; if (vertexLayout & kColor_VertexLayoutBit) { size += sizeof(GrColor); } if (vertexLayout & kCoverage_VertexLayoutBit) { size += sizeof(GrColor); } if (vertexLayout & kEdge_VertexLayoutBit) { size += 4 * sizeof(GrScalar); } return size; } //////////////////////////////////////////////////////////////////////////////// /** * Functions for computing offsets of various components from the layout * bitfield. * * Order of vertex components: * Position * Tex Coord 0 * ... * Tex Coord GrDrawState::kMaxTexCoords-1 * Color * Coverage */ int GrDrawTarget::VertexStageCoordOffset(int stage, GrVertexLayout vertexLayout) { GrAssert(check_layout(vertexLayout)); if (StagePosAsTexCoordVertexLayoutBit(stage) & vertexLayout) { return 0; } int tcIdx = VertexTexCoordsForStage(stage, vertexLayout); if (tcIdx >= 0) { int vecSize = (vertexLayout & kTextFormat_VertexLayoutBit) ? sizeof(GrGpuTextVertex) : sizeof(GrPoint); int offset = vecSize; // position // figure out how many tex coordinates are present and precede this one. for (int t = 0; t < tcIdx; ++t) { if (gTexCoordMasks[t] & vertexLayout) { offset += vecSize; } } return offset; } return -1; } int GrDrawTarget::VertexColorOffset(GrVertexLayout vertexLayout) { GrAssert(check_layout(vertexLayout)); if (vertexLayout & kColor_VertexLayoutBit) { int vecSize = (vertexLayout & kTextFormat_VertexLayoutBit) ? sizeof(GrGpuTextVertex) : sizeof(GrPoint); return vecSize * (num_tex_coords(vertexLayout) + 1); //+1 for pos } return -1; } int GrDrawTarget::VertexCoverageOffset(GrVertexLayout vertexLayout) { GrAssert(check_layout(vertexLayout)); if (vertexLayout & kCoverage_VertexLayoutBit) { int vecSize = (vertexLayout & kTextFormat_VertexLayoutBit) ? sizeof(GrGpuTextVertex) : sizeof(GrPoint); int offset = vecSize * (num_tex_coords(vertexLayout) + 1); if (vertexLayout & kColor_VertexLayoutBit) { offset += sizeof(GrColor); } return offset; } return -1; } int GrDrawTarget::VertexEdgeOffset(GrVertexLayout vertexLayout) { GrAssert(check_layout(vertexLayout)); // edge pts are after the pos, tex coords, and color if (vertexLayout & kEdge_VertexLayoutBit) { int vecSize = (vertexLayout & kTextFormat_VertexLayoutBit) ? sizeof(GrGpuTextVertex) : sizeof(GrPoint); int offset = vecSize * (num_tex_coords(vertexLayout) + 1); //+1 for pos if (vertexLayout & kColor_VertexLayoutBit) { offset += sizeof(GrColor); } if (vertexLayout & kCoverage_VertexLayoutBit) { offset += sizeof(GrColor); } return offset; } return -1; } int GrDrawTarget::VertexSizeAndOffsetsByIdx( GrVertexLayout vertexLayout, int texCoordOffsetsByIdx[GrDrawState::kMaxTexCoords], int* colorOffset, int* coverageOffset, int* edgeOffset) { GrAssert(check_layout(vertexLayout)); int vecSize = (vertexLayout & kTextFormat_VertexLayoutBit) ? sizeof(GrGpuTextVertex) : sizeof(GrPoint); int size = vecSize; // position for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) { if (gTexCoordMasks[t] & vertexLayout) { if (NULL != texCoordOffsetsByIdx) { texCoordOffsetsByIdx[t] = size; } size += vecSize; } else { if (NULL != texCoordOffsetsByIdx) { texCoordOffsetsByIdx[t] = -1; } } } if (kColor_VertexLayoutBit & vertexLayout) { if (NULL != colorOffset) { *colorOffset = size; } size += sizeof(GrColor); } else { if (NULL != colorOffset) { *colorOffset = -1; } } if (kCoverage_VertexLayoutBit & vertexLayout) { if (NULL != coverageOffset) { *coverageOffset = size; } size += sizeof(GrColor); } else { if (NULL != coverageOffset) { *coverageOffset = -1; } } if (kEdge_VertexLayoutBit & vertexLayout) { if (NULL != edgeOffset) { *edgeOffset = size; } size += 4 * sizeof(GrScalar); } else { if (NULL != edgeOffset) { *edgeOffset = -1; } } return size; } int GrDrawTarget::VertexSizeAndOffsetsByStage( GrVertexLayout vertexLayout, int texCoordOffsetsByStage[GrDrawState::kNumStages], int* colorOffset, int* coverageOffset, int* edgeOffset) { GrAssert(check_layout(vertexLayout)); int texCoordOffsetsByIdx[GrDrawState::kMaxTexCoords]; int size = VertexSizeAndOffsetsByIdx(vertexLayout, (NULL == texCoordOffsetsByStage) ? NULL : texCoordOffsetsByIdx, colorOffset, coverageOffset, edgeOffset); if (NULL != texCoordOffsetsByStage) { for (int s = 0; s < GrDrawState::kNumStages; ++s) { int tcIdx; if (StagePosAsTexCoordVertexLayoutBit(s) & vertexLayout) { texCoordOffsetsByStage[s] = 0; } else if ((tcIdx = VertexTexCoordsForStage(s, vertexLayout)) >= 0) { texCoordOffsetsByStage[s] = texCoordOffsetsByIdx[tcIdx]; } else { texCoordOffsetsByStage[s] = -1; } } } return size; } //////////////////////////////////////////////////////////////////////////////// bool GrDrawTarget::VertexUsesStage(int stage, GrVertexLayout vertexLayout) { GrAssert(stage < GrDrawState::kNumStages); GrAssert(check_layout(vertexLayout)); return !!(gStageMasks[stage] & vertexLayout); } bool GrDrawTarget::VertexUsesTexCoordIdx(int coordIndex, GrVertexLayout vertexLayout) { GrAssert(coordIndex < GrDrawState::kMaxTexCoords); GrAssert(check_layout(vertexLayout)); return !!(gTexCoordMasks[coordIndex] & vertexLayout); } int GrDrawTarget::VertexTexCoordsForStage(int stage, GrVertexLayout vertexLayout) { GrAssert(stage < GrDrawState::kNumStages); GrAssert(check_layout(vertexLayout)); int bit = vertexLayout & gStageTexCoordMasks[stage]; if (bit) { // figure out which set of texture coordates is used // bits are ordered T0S0, T0S1, T0S2, ..., T1S0, T1S1, ... // and start at bit 0. GR_STATIC_ASSERT(sizeof(GrVertexLayout) <= sizeof(uint32_t)); return (32 - Gr_clz(bit) - 1) / GrDrawState::kNumStages; } return -1; } //////////////////////////////////////////////////////////////////////////////// void GrDrawTarget::VertexLayoutUnitTest() { // Ensure that our globals mask arrays are correct GrVertexLayout stageTexCoordMasks[GrDrawState::kNumStages]; GrVertexLayout stageMasks[GrDrawState::kNumStages]; GrVertexLayout texCoordMasks[GrDrawState::kMaxTexCoords]; gen_mask_arrays(stageTexCoordMasks, stageMasks, texCoordMasks); for (int s = 0; s < GrDrawState::kNumStages; ++s) { GrAssert(stageTexCoordMasks[s] == gStageTexCoordMasks[s]); GrAssert(stageMasks[s] == gStageMasks[s]); } for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) { GrAssert(texCoordMasks[t] == gTexCoordMasks[t]); } // not necessarily exhaustive static bool run; if (!run) { run = true; for (int s = 0; s < GrDrawState::kNumStages; ++s) { GrAssert(!VertexUsesStage(s, 0)); GrAssert(-1 == VertexStageCoordOffset(s, 0)); GrVertexLayout stageMask = 0; for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) { stageMask |= StageTexCoordVertexLayoutBit(s,t); } GrAssert(1 == GrDrawState::kMaxTexCoords || !check_layout(stageMask)); GrAssert(gStageTexCoordMasks[s] == stageMask); stageMask |= StagePosAsTexCoordVertexLayoutBit(s); GrAssert(gStageMasks[s] == stageMask); GrAssert(!check_layout(stageMask)); } for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) { GrVertexLayout tcMask = 0; GrAssert(!VertexUsesTexCoordIdx(t, 0)); for (int s = 0; s < GrDrawState::kNumStages; ++s) { tcMask |= StageTexCoordVertexLayoutBit(s,t); GrAssert(VertexUsesStage(s, tcMask)); GrAssert(sizeof(GrPoint) == VertexStageCoordOffset(s, tcMask)); GrAssert(VertexUsesTexCoordIdx(t, tcMask)); GrAssert(2*sizeof(GrPoint) == VertexSize(tcMask)); GrAssert(t == VertexTexCoordsForStage(s, tcMask)); for (int s2 = s + 1; s2 < GrDrawState::kNumStages; ++s2) { GrAssert(-1 == VertexStageCoordOffset(s2, tcMask)); GrAssert(!VertexUsesStage(s2, tcMask)); GrAssert(-1 == VertexTexCoordsForStage(s2, tcMask)); #if GR_DEBUG GrVertexLayout posAsTex = tcMask | StagePosAsTexCoordVertexLayoutBit(s2); #endif GrAssert(0 == VertexStageCoordOffset(s2, posAsTex)); GrAssert(VertexUsesStage(s2, posAsTex)); GrAssert(2*sizeof(GrPoint) == VertexSize(posAsTex)); GrAssert(-1 == VertexTexCoordsForStage(s2, posAsTex)); GrAssert(-1 == VertexEdgeOffset(posAsTex)); } GrAssert(-1 == VertexEdgeOffset(tcMask)); GrAssert(-1 == VertexColorOffset(tcMask)); GrAssert(-1 == VertexCoverageOffset(tcMask)); #if GR_DEBUG GrVertexLayout withColor = tcMask | kColor_VertexLayoutBit; #endif GrAssert(-1 == VertexCoverageOffset(withColor)); GrAssert(2*sizeof(GrPoint) == VertexColorOffset(withColor)); GrAssert(2*sizeof(GrPoint) + sizeof(GrColor) == VertexSize(withColor)); #if GR_DEBUG GrVertexLayout withEdge = tcMask | kEdge_VertexLayoutBit; #endif GrAssert(-1 == VertexColorOffset(withEdge)); GrAssert(2*sizeof(GrPoint) == VertexEdgeOffset(withEdge)); GrAssert(4*sizeof(GrPoint) == VertexSize(withEdge)); #if GR_DEBUG GrVertexLayout withColorAndEdge = withColor | kEdge_VertexLayoutBit; #endif GrAssert(2*sizeof(GrPoint) == VertexColorOffset(withColorAndEdge)); GrAssert(2*sizeof(GrPoint) + sizeof(GrColor) == VertexEdgeOffset(withColorAndEdge)); GrAssert(4*sizeof(GrPoint) + sizeof(GrColor) == VertexSize(withColorAndEdge)); #if GR_DEBUG GrVertexLayout withCoverage = tcMask | kCoverage_VertexLayoutBit; #endif GrAssert(-1 == VertexColorOffset(withCoverage)); GrAssert(2*sizeof(GrPoint) == VertexCoverageOffset(withCoverage)); GrAssert(2*sizeof(GrPoint) + sizeof(GrColor) == VertexSize(withCoverage)); #if GR_DEBUG GrVertexLayout withCoverageAndColor = tcMask | kCoverage_VertexLayoutBit | kColor_VertexLayoutBit; #endif GrAssert(2*sizeof(GrPoint) == VertexColorOffset(withCoverageAndColor)); GrAssert(2*sizeof(GrPoint) + sizeof(GrColor) == VertexCoverageOffset(withCoverageAndColor)); GrAssert(2*sizeof(GrPoint) + 2 * sizeof(GrColor) == VertexSize(withCoverageAndColor)); } GrAssert(gTexCoordMasks[t] == tcMask); GrAssert(check_layout(tcMask)); int stageOffsets[GrDrawState::kNumStages]; int colorOffset; int edgeOffset; int coverageOffset; int size; size = VertexSizeAndOffsetsByStage(tcMask, stageOffsets, &colorOffset, &coverageOffset, &edgeOffset); GrAssert(2*sizeof(GrPoint) == size); GrAssert(-1 == colorOffset); GrAssert(-1 == coverageOffset); GrAssert(-1 == edgeOffset); for (int s = 0; s < GrDrawState::kNumStages; ++s) { GrAssert(VertexUsesStage(s, tcMask)); GrAssert(sizeof(GrPoint) == stageOffsets[s]); GrAssert(sizeof(GrPoint) == VertexStageCoordOffset(s, tcMask)); } } } } //////////////////////////////////////////////////////////////////////////////// #define DEBUG_INVAL_BUFFER 0xdeadcafe #define DEBUG_INVAL_START_IDX -1 GrDrawTarget::GrDrawTarget() { #if GR_DEBUG VertexLayoutUnitTest(); #endif GeometrySrcState& geoSrc = fGeoSrcStateStack.push_back(); #if GR_DEBUG geoSrc.fVertexCount = DEBUG_INVAL_START_IDX; geoSrc.fVertexBuffer = (GrVertexBuffer*)DEBUG_INVAL_BUFFER; geoSrc.fIndexCount = DEBUG_INVAL_START_IDX; geoSrc.fIndexBuffer = (GrIndexBuffer*)DEBUG_INVAL_BUFFER; #endif geoSrc.fVertexSrc = kNone_GeometrySrcType; geoSrc.fIndexSrc = kNone_GeometrySrcType; } GrDrawTarget::~GrDrawTarget() { GrAssert(1 == fGeoSrcStateStack.count()); GeometrySrcState& geoSrc = fGeoSrcStateStack.back(); GrAssert(kNone_GeometrySrcType == geoSrc.fIndexSrc); GrAssert(kNone_GeometrySrcType == geoSrc.fVertexSrc); } void GrDrawTarget::releaseGeometry() { int popCnt = fGeoSrcStateStack.count() - 1; while (popCnt) { this->popGeometrySource(); --popCnt; } this->resetVertexSource(); this->resetIndexSource(); } void GrDrawTarget::setClip(const GrClip& clip) { clipWillBeSet(clip); fClip = clip; } const GrClip& GrDrawTarget::getClip() const { return fClip; } void GrDrawTarget::saveCurrentDrawState(SavedDrawState* state) const { state->fState.set(fCurrDrawState); } void GrDrawTarget::restoreDrawState(const SavedDrawState& state) { fCurrDrawState = *state.fState.get(); } void GrDrawTarget::copyDrawState(const GrDrawTarget& srcTarget) { fCurrDrawState = srcTarget.fCurrDrawState; } bool GrDrawTarget::reserveVertexSpace(GrVertexLayout vertexLayout, int vertexCount, void** vertices) { GeometrySrcState& geoSrc = fGeoSrcStateStack.back(); bool acquired = false; if (vertexCount > 0) { GrAssert(NULL != vertices); this->releasePreviousVertexSource(); geoSrc.fVertexSrc = kNone_GeometrySrcType; acquired = this->onReserveVertexSpace(vertexLayout, vertexCount, vertices); } if (acquired) { geoSrc.fVertexSrc = kReserved_GeometrySrcType; geoSrc.fVertexCount = vertexCount; geoSrc.fVertexLayout = vertexLayout; } else if (NULL != vertices) { *vertices = NULL; } return acquired; } bool GrDrawTarget::reserveIndexSpace(int indexCount, void** indices) { GeometrySrcState& geoSrc = fGeoSrcStateStack.back(); bool acquired = false; if (indexCount > 0) { GrAssert(NULL != indices); this->releasePreviousIndexSource(); geoSrc.fIndexSrc = kNone_GeometrySrcType; acquired = this->onReserveIndexSpace(indexCount, indices); } if (acquired) { geoSrc.fIndexSrc = kReserved_GeometrySrcType; geoSrc.fIndexCount = indexCount; } else if (NULL != indices) { *indices = NULL; } return acquired; } bool GrDrawTarget::reserveVertexAndIndexSpace(GrVertexLayout vertexLayout, int vertexCount, int indexCount, void** vertices, void** indices) { this->willReserveVertexAndIndexSpace(vertexLayout, vertexCount, indexCount); if (vertexCount) { if (!this->reserveVertexSpace(vertexLayout, vertexCount, vertices)) { if (indexCount) { this->resetIndexSource(); } return false; } } if (indexCount) { if (!this->reserveIndexSpace(indexCount, indices)) { if (vertexCount) { this->resetVertexSource(); } return false; } } return true; } bool GrDrawTarget::geometryHints(GrVertexLayout vertexLayout, int32_t* vertexCount, int32_t* indexCount) const { if (NULL != vertexCount) { *vertexCount = -1; } if (NULL != indexCount) { *indexCount = -1; } return false; } void GrDrawTarget::releasePreviousVertexSource() { GeometrySrcState& geoSrc = fGeoSrcStateStack.back(); switch (geoSrc.fVertexSrc) { case kNone_GeometrySrcType: break; case kArray_GeometrySrcType: this->releaseVertexArray(); break; case kReserved_GeometrySrcType: this->releaseReservedVertexSpace(); break; case kBuffer_GeometrySrcType: geoSrc.fVertexBuffer->unref(); #if GR_DEBUG geoSrc.fVertexBuffer = (GrVertexBuffer*)DEBUG_INVAL_BUFFER; #endif break; default: GrCrash("Unknown Vertex Source Type."); break; } } void GrDrawTarget::releasePreviousIndexSource() { GeometrySrcState& geoSrc = fGeoSrcStateStack.back(); switch (geoSrc.fIndexSrc) { case kNone_GeometrySrcType: // these two don't require break; case kArray_GeometrySrcType: this->releaseIndexArray(); break; case kReserved_GeometrySrcType: this->releaseReservedIndexSpace(); break; case kBuffer_GeometrySrcType: geoSrc.fIndexBuffer->unref(); #if GR_DEBUG geoSrc.fIndexBuffer = (GrIndexBuffer*)DEBUG_INVAL_BUFFER; #endif break; default: GrCrash("Unknown Index Source Type."); break; } } void GrDrawTarget::setVertexSourceToArray(GrVertexLayout vertexLayout, const void* vertexArray, int vertexCount) { this->releasePreviousVertexSource(); GeometrySrcState& geoSrc = fGeoSrcStateStack.back(); geoSrc.fVertexSrc = kArray_GeometrySrcType; geoSrc.fVertexLayout = vertexLayout; geoSrc.fVertexCount = vertexCount; this->onSetVertexSourceToArray(vertexArray, vertexCount); } void GrDrawTarget::setIndexSourceToArray(const void* indexArray, int indexCount) { this->releasePreviousIndexSource(); GeometrySrcState& geoSrc = fGeoSrcStateStack.back(); geoSrc.fIndexSrc = kArray_GeometrySrcType; geoSrc.fIndexCount = indexCount; this->onSetIndexSourceToArray(indexArray, indexCount); } void GrDrawTarget::setVertexSourceToBuffer(GrVertexLayout vertexLayout, const GrVertexBuffer* buffer) { this->releasePreviousVertexSource(); GeometrySrcState& geoSrc = fGeoSrcStateStack.back(); geoSrc.fVertexSrc = kBuffer_GeometrySrcType; geoSrc.fVertexBuffer = buffer; buffer->ref(); geoSrc.fVertexLayout = vertexLayout; } void GrDrawTarget::setIndexSourceToBuffer(const GrIndexBuffer* buffer) { this->releasePreviousIndexSource(); GeometrySrcState& geoSrc = fGeoSrcStateStack.back(); geoSrc.fIndexSrc = kBuffer_GeometrySrcType; geoSrc.fIndexBuffer = buffer; buffer->ref(); } void GrDrawTarget::resetVertexSource() { this->releasePreviousVertexSource(); GeometrySrcState& geoSrc = fGeoSrcStateStack.back(); geoSrc.fVertexSrc = kNone_GeometrySrcType; } void GrDrawTarget::resetIndexSource() { this->releasePreviousIndexSource(); GeometrySrcState& geoSrc = fGeoSrcStateStack.back(); geoSrc.fIndexSrc = kNone_GeometrySrcType; } void GrDrawTarget::pushGeometrySource() { this->geometrySourceWillPush(); GeometrySrcState& newState = fGeoSrcStateStack.push_back(); newState.fIndexSrc = kNone_GeometrySrcType; newState.fVertexSrc = kNone_GeometrySrcType; #if GR_DEBUG newState.fVertexCount = ~0; newState.fVertexBuffer = (GrVertexBuffer*)~0; newState.fIndexCount = ~0; newState.fIndexBuffer = (GrIndexBuffer*)~0; #endif } void GrDrawTarget::popGeometrySource() { const GeometrySrcState& geoSrc = this->getGeomSrc(); // if popping last element then pops are unbalanced with pushes GrAssert(fGeoSrcStateStack.count() > 1); this->geometrySourceWillPop(fGeoSrcStateStack.fromBack(1)); this->releasePreviousVertexSource(); this->releasePreviousIndexSource(); fGeoSrcStateStack.pop_back(); } //////////////////////////////////////////////////////////////////////////////// bool GrDrawTarget::checkDraw(GrPrimitiveType type, int startVertex, int startIndex, int vertexCount, int indexCount) const { #if GR_DEBUG const GeometrySrcState& geoSrc = fGeoSrcStateStack.back(); int maxVertex = startVertex + vertexCount; int maxValidVertex; switch (geoSrc.fVertexSrc) { case kNone_GeometrySrcType: GrCrash("Attempting to draw without vertex src."); case kReserved_GeometrySrcType: // fallthrough case kArray_GeometrySrcType: maxValidVertex = geoSrc.fVertexCount; break; case kBuffer_GeometrySrcType: maxValidVertex = geoSrc.fVertexBuffer->sizeInBytes() / VertexSize(geoSrc.fVertexLayout); break; } if (maxVertex > maxValidVertex) { GrCrash("Drawing outside valid vertex range."); } if (indexCount > 0) { int maxIndex = startIndex + indexCount; int maxValidIndex; switch (geoSrc.fIndexSrc) { case kNone_GeometrySrcType: GrCrash("Attempting to draw indexed geom without index src."); case kReserved_GeometrySrcType: // fallthrough case kArray_GeometrySrcType: maxValidIndex = geoSrc.fIndexCount; break; case kBuffer_GeometrySrcType: maxValidIndex = geoSrc.fIndexBuffer->sizeInBytes() / sizeof(uint16_t); break; } if (maxIndex > maxValidIndex) { GrCrash("Index reads outside valid index range."); } } #endif const GrDrawState& drawState = this->getDrawState(); if (NULL == drawState.getRenderTarget()) { return false; } if (GrPixelConfigIsUnpremultiplied(drawState.getRenderTarget()->config())) { if (kOne_BlendCoeff != drawState.getSrcBlendCoeff() || kZero_BlendCoeff != drawState.getDstBlendCoeff()) { return false; } } for (int s = 0; s < GrDrawState::kNumStages; ++s) { // We don't support using unpremultiplied textures with filters (other // than nearest). Alpha-premulling is not distributive WRT to filtering. // We'd have to filter each texel before filtering. We could do this for // our custom filters but we would also have to disable bilerp and do // a custom bilerp in the shader. Until Skia itself supports unpremul // configs there is no pressure to implement this. if (this->isStageEnabled(s) && GrPixelConfigIsUnpremultiplied(drawState.getTexture(s)->config()) && GrSamplerState::kNearest_Filter != drawState.getSampler(s).getFilter()) { return false; } } return true; } void GrDrawTarget::drawIndexed(GrPrimitiveType type, int startVertex, int startIndex, int vertexCount, int indexCount) { if (indexCount > 0 && this->checkDraw(type, startVertex, startIndex, vertexCount, indexCount)) { this->onDrawIndexed(type, startVertex, startIndex, vertexCount, indexCount); } } void GrDrawTarget::drawNonIndexed(GrPrimitiveType type, int startVertex, int vertexCount) { if (vertexCount > 0 && this->checkDraw(type, startVertex, -1, vertexCount, -1)) { this->onDrawNonIndexed(type, startVertex, vertexCount); } } //////////////////////////////////////////////////////////////////////////////// // Some blend modes allow folding a partial coverage value into the color's // alpha channel, while others will blend incorrectly. bool GrDrawTarget::canTweakAlphaForCoverage() const { /** * The fractional coverage is f * The src and dst coeffs are Cs and Cd * The dst and src colors are S and D * We want the blend to compute: f*Cs*S + (f*Cd + (1-f))D * By tweaking the source color's alpha we're replacing S with S'=fS. It's * obvious that that first term will always be ok. The second term can be * rearranged as [1-(1-Cd)f]D. By substituing in the various possbilities * for Cd we find that only 1, ISA, and ISC produce the correct depth * coeffecient in terms of S' and D. */ GrBlendCoeff dstCoeff = this->getDrawState().getDstBlendCoeff(); return kOne_BlendCoeff == dstCoeff || kISA_BlendCoeff == dstCoeff || kISC_BlendCoeff == dstCoeff; } bool GrDrawTarget::srcAlphaWillBeOne() const { const GrVertexLayout& layout = this->getGeomSrc().fVertexLayout; const GrDrawState& drawState = this->getDrawState(); // Check if per-vertex or constant color may have partial alpha if ((layout & kColor_VertexLayoutBit) || 0xff != GrColorUnpackA(drawState.getColor())) { return false; } // Check if color filter could introduce an alpha // (TODO: Consider being more aggressive with regards to detecting 0xff // final alpha from color filter). if (SkXfermode::kDst_Mode != drawState.getColorFilterMode()) { return false; } // Check if a color stage could create a partial alpha for (int s = 0; s < drawState.getFirstCoverageStage(); ++s) { if (StageWillBeUsed(s, layout, fCurrDrawState)) { GrAssert(NULL != drawState.getTexture(s)); GrPixelConfig config = drawState.getTexture(s)->config(); if (!GrPixelConfigIsOpaque(config)) { return false; } } } return true; } GrDrawTarget::BlendOptFlags GrDrawTarget::getBlendOpts(bool forceCoverage, GrBlendCoeff* srcCoeff, GrBlendCoeff* dstCoeff) const { const GrVertexLayout& layout = this->getGeomSrc().fVertexLayout; const GrDrawState& drawState = this->getDrawState(); GrBlendCoeff bogusSrcCoeff, bogusDstCoeff; if (NULL == srcCoeff) { srcCoeff = &bogusSrcCoeff; } *srcCoeff = drawState.getSrcBlendCoeff(); if (NULL == dstCoeff) { dstCoeff = &bogusDstCoeff; } *dstCoeff = drawState.getDstBlendCoeff(); // We don't ever expect source coeffecients to reference the source GrAssert(kSA_BlendCoeff != *srcCoeff && kISA_BlendCoeff != *srcCoeff && kSC_BlendCoeff != *srcCoeff && kISC_BlendCoeff != *srcCoeff); // same for dst GrAssert(kDA_BlendCoeff != *dstCoeff && kIDA_BlendCoeff != *dstCoeff && kDC_BlendCoeff != *dstCoeff && kIDC_BlendCoeff != *dstCoeff); if (drawState.isColorWriteDisabled()) { *srcCoeff = kZero_BlendCoeff; *dstCoeff = kOne_BlendCoeff; } bool srcAIsOne = this->srcAlphaWillBeOne(); bool dstCoeffIsOne = kOne_BlendCoeff == *dstCoeff || (kSA_BlendCoeff == *dstCoeff && srcAIsOne); bool dstCoeffIsZero = kZero_BlendCoeff == *dstCoeff || (kISA_BlendCoeff == *dstCoeff && srcAIsOne); // When coeffs are (0,1) there is no reason to draw at all, unless // stenciling is enabled. Having color writes disabled is effectively // (0,1). The same applies when coverage is known to be 0. if ((kZero_BlendCoeff == *srcCoeff && dstCoeffIsOne) || (!(layout & kCoverage_VertexLayoutBit) && 0 == drawState.getCoverage())) { if (drawState.getStencil().doesWrite()) { return kDisableBlend_BlendOptFlag | kEmitTransBlack_BlendOptFlag; } else { return kSkipDraw_BlendOptFlag; } } // check for coverage due to constant coverage, per-vertex coverage, // edge aa or coverage texture stage bool hasCoverage = forceCoverage || 0xffffffff != drawState.getCoverage() || drawState.getNumAAEdges() > 0 || (layout & kCoverage_VertexLayoutBit) || (layout & kEdge_VertexLayoutBit); for (int s = drawState.getFirstCoverageStage(); !hasCoverage && s < GrDrawState::kNumStages; ++s) { if (StageWillBeUsed(s, layout, fCurrDrawState)) { hasCoverage = true; } } // if we don't have coverage we can check whether the dst // has to read at all. If not, we'll disable blending. if (!hasCoverage) { if (dstCoeffIsZero) { if (kOne_BlendCoeff == *srcCoeff) { // if there is no coverage and coeffs are (1,0) then we // won't need to read the dst at all, it gets replaced by src return kDisableBlend_BlendOptFlag; } else if (kZero_BlendCoeff == *srcCoeff) { // if the op is "clear" then we don't need to emit a color // or blend, just write transparent black into the dst. *srcCoeff = kOne_BlendCoeff; *dstCoeff = kZero_BlendCoeff; return kDisableBlend_BlendOptFlag | kEmitTransBlack_BlendOptFlag; } } } else { // check whether coverage can be safely rolled into alpha // of if we can skip color computation and just emit coverage if (this->canTweakAlphaForCoverage()) { return kCoverageAsAlpha_BlendOptFlag; } if (dstCoeffIsZero) { if (kZero_BlendCoeff == *srcCoeff) { // the source color is not included in the blend // the dst coeff is effectively zero so blend works out to: // (c)(0)D + (1-c)D = (1-c)D. *dstCoeff = kISA_BlendCoeff; return kEmitCoverage_BlendOptFlag; } else if (srcAIsOne) { // the dst coeff is effectively zero so blend works out to: // cS + (c)(0)D + (1-c)D = cS + (1-c)D. // If Sa is 1 then we can replace Sa with c // and set dst coeff to 1-Sa. *dstCoeff = kISA_BlendCoeff; return kCoverageAsAlpha_BlendOptFlag; } } else if (dstCoeffIsOne) { // the dst coeff is effectively one so blend works out to: // cS + (c)(1)D + (1-c)D = cS + D. *dstCoeff = kOne_BlendCoeff; return kCoverageAsAlpha_BlendOptFlag; } } return kNone_BlendOpt; } bool GrDrawTarget::willUseHWAALines() const { // there is a conflict between using smooth lines and our use of // premultiplied alpha. Smooth lines tweak the incoming alpha value // but not in a premul-alpha way. So we only use them when our alpha // is 0xff and tweaking the color for partial coverage is OK if (!fCaps.fHWAALineSupport || !this->getDrawState().isHWAntialiasState()) { return false; } BlendOptFlags opts = this->getBlendOpts(); return (kDisableBlend_BlendOptFlag & opts) && (kCoverageAsAlpha_BlendOptFlag & opts); } bool GrDrawTarget::canApplyCoverage() const { // we can correctly apply coverage if a) we have dual source blending // or b) one of our blend optimizations applies. return this->getCaps().fDualSourceBlendingSupport || kNone_BlendOpt != this->getBlendOpts(true); } bool GrDrawTarget::drawWillReadDst() const { return SkToBool((kDisableBlend_BlendOptFlag | kSkipDraw_BlendOptFlag) & this->getBlendOpts()); } //////////////////////////////////////////////////////////////////////////////// void GrDrawTarget::drawRect(const GrRect& rect, const GrMatrix* matrix, StageMask stageMask, const GrRect* srcRects[], const GrMatrix* srcMatrices[]) { GrVertexLayout layout = GetRectVertexLayout(stageMask, srcRects); AutoReleaseGeometry geo(this, layout, 4, 0); if (!geo.succeeded()) { GrPrintf("Failed to get space for vertices!\n"); return; } SetRectVertices(rect, matrix, srcRects, srcMatrices, layout, geo.vertices()); drawNonIndexed(kTriangleFan_PrimitiveType, 0, 4); } GrVertexLayout GrDrawTarget::GetRectVertexLayout(StageMask stageMask, const GrRect* srcRects[]) { GrVertexLayout layout = 0; for (int i = 0; i < GrDrawState::kNumStages; ++i) { int numTC = 0; if (stageMask & (1 << i)) { if (NULL != srcRects && NULL != srcRects[i]) { layout |= StageTexCoordVertexLayoutBit(i, numTC); ++numTC; } else { layout |= StagePosAsTexCoordVertexLayoutBit(i); } } } return layout; } void GrDrawTarget::clipWillBeSet(const GrClip& clip) { } void GrDrawTarget::SetRectVertices(const GrRect& rect, const GrMatrix* matrix, const GrRect* srcRects[], const GrMatrix* srcMatrices[], GrVertexLayout layout, void* vertices) { #if GR_DEBUG // check that the layout and srcRects agree for (int i = 0; i < GrDrawState::kNumStages; ++i) { if (VertexTexCoordsForStage(i, layout) >= 0) { GR_DEBUGASSERT(NULL != srcRects && NULL != srcRects[i]); } else { GR_DEBUGASSERT(NULL == srcRects || NULL == srcRects[i]); } } #endif int stageOffsets[GrDrawState::kNumStages]; int vsize = VertexSizeAndOffsetsByStage(layout, stageOffsets, NULL, NULL, NULL); GrTCast(vertices)->setRectFan(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, vsize); if (NULL != matrix) { matrix->mapPointsWithStride(GrTCast(vertices), vsize, 4); } for (int i = 0; i < GrDrawState::kNumStages; ++i) { if (stageOffsets[i] > 0) { GrPoint* coords = GrTCast(GrTCast(vertices) + stageOffsets[i]); coords->setRectFan(srcRects[i]->fLeft, srcRects[i]->fTop, srcRects[i]->fRight, srcRects[i]->fBottom, vsize); if (NULL != srcMatrices && NULL != srcMatrices[i]) { srcMatrices[i]->mapPointsWithStride(coords, vsize, 4); } } } } //////////////////////////////////////////////////////////////////////////////// GrDrawTarget::AutoStateRestore::AutoStateRestore() { fDrawTarget = NULL; } GrDrawTarget::AutoStateRestore::AutoStateRestore(GrDrawTarget* target) { fDrawTarget = target; if (NULL != fDrawTarget) { fDrawTarget->saveCurrentDrawState(&fDrawState); } } GrDrawTarget::AutoStateRestore::~AutoStateRestore() { if (NULL != fDrawTarget) { fDrawTarget->restoreDrawState(fDrawState); } } void GrDrawTarget::AutoStateRestore::set(GrDrawTarget* target) { if (target != fDrawTarget) { if (NULL != fDrawTarget) { fDrawTarget->restoreDrawState(fDrawState); } if (NULL != target) { target->saveCurrentDrawState(&fDrawState); } fDrawTarget = target; } } //////////////////////////////////////////////////////////////////////////////// GrDrawTarget::AutoDeviceCoordDraw::AutoDeviceCoordDraw( GrDrawTarget* target, GrDrawState::StageMask stageMask) { GrAssert(NULL != target); GrDrawState* drawState = target->drawState(); fDrawTarget = target; fViewMatrix = drawState->getViewMatrix(); fStageMask = stageMask; if (fStageMask) { GrMatrix invVM; if (fViewMatrix.invert(&invVM)) { for (int s = 0; s < GrDrawState::kNumStages; ++s) { if (fStageMask & (1 << s)) { fSamplerMatrices[s] = drawState->getSampler(s).getMatrix(); } } drawState->preConcatSamplerMatrices(fStageMask, invVM); } else { // sad trombone sound fStageMask = 0; } } drawState->viewMatrix()->reset(); } GrDrawTarget::AutoDeviceCoordDraw::~AutoDeviceCoordDraw() { GrDrawState* drawState = fDrawTarget->drawState(); drawState->setViewMatrix(fViewMatrix); for (int s = 0; s < GrDrawState::kNumStages; ++s) { if (fStageMask & (1 << s)) { *drawState->sampler(s)->matrix() = fSamplerMatrices[s]; } } } //////////////////////////////////////////////////////////////////////////////// GrDrawTarget::AutoReleaseGeometry::AutoReleaseGeometry( GrDrawTarget* target, GrVertexLayout vertexLayout, int vertexCount, int indexCount) { fTarget = NULL; this->set(target, vertexLayout, vertexCount, indexCount); } GrDrawTarget::AutoReleaseGeometry::AutoReleaseGeometry() { fTarget = NULL; } GrDrawTarget::AutoReleaseGeometry::~AutoReleaseGeometry() { this->reset(); } bool GrDrawTarget::AutoReleaseGeometry::set(GrDrawTarget* target, GrVertexLayout vertexLayout, int vertexCount, int indexCount) { this->reset(); fTarget = target; bool success = true; if (NULL != fTarget) { fTarget = target; success = target->reserveVertexAndIndexSpace(vertexLayout, vertexCount, indexCount, &fVertices, &fIndices); if (!success) { fTarget = NULL; this->reset(); } } GrAssert(success == (NULL != fTarget)); return success; } void GrDrawTarget::AutoReleaseGeometry::reset() { if (NULL != fTarget) { if (NULL != fVertices) { fTarget->resetVertexSource(); } if (NULL != fIndices) { fTarget->resetIndexSource(); } fTarget = NULL; } fVertices = NULL; fIndices = NULL; } void GrDrawTarget::Caps::print() const { static const char* gNY[] = {"NO", "YES"}; GrPrintf("8 Bit Palette Support : %s\n", gNY[f8BitPaletteSupport]); GrPrintf("NPOT Texture Tile Support : %s\n", gNY[fNPOTTextureTileSupport]); GrPrintf("Two Sided Stencil Support : %s\n", gNY[fTwoSidedStencilSupport]); GrPrintf("Stencil Wrap Ops Support : %s\n", gNY[fStencilWrapOpsSupport]); GrPrintf("HW AA Lines Support : %s\n", gNY[fHWAALineSupport]); GrPrintf("Shader Derivative Support : %s\n", gNY[fShaderDerivativeSupport]); GrPrintf("Geometry Shader Support : %s\n", gNY[fGeometryShaderSupport]); GrPrintf("FSAA Support : %s\n", gNY[fFSAASupport]); GrPrintf("Dual Source Blending Support: %s\n", gNY[fDualSourceBlendingSupport]); GrPrintf("Buffer Lock Support : %s\n", gNY[fBufferLockSupport]); GrPrintf("Max Texture Size : %d\n", fMaxTextureSize); GrPrintf("Max Render Target Size : %d\n", fMaxRenderTargetSize); }