Chris Dalton | ebb37e7 | 2021-01-27 17:59:45 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2019 Google LLC. |
| 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 "src/gpu/tessellate/GrPathInnerTriangulateOp.h" |
| 9 | |
| 10 | #include "src/gpu/GrEagerVertexAllocator.h" |
| 11 | #include "src/gpu/GrInnerFanTriangulator.h" |
| 12 | #include "src/gpu/GrOpFlushState.h" |
| 13 | #include "src/gpu/GrRecordingContextPriv.h" |
| 14 | #include "src/gpu/tessellate/GrFillPathShader.h" |
| 15 | #include "src/gpu/tessellate/GrPathTessellator.h" |
| 16 | #include "src/gpu/tessellate/GrStencilPathShader.h" |
| 17 | #include "src/gpu/tessellate/GrTessellationPathRenderer.h" |
| 18 | |
| 19 | using OpFlags = GrTessellationPathRenderer::OpFlags; |
| 20 | |
| 21 | void GrPathInnerTriangulateOp::visitProxies(const VisitProxyFunc& fn) const { |
| 22 | if (fPipelineForFills) { |
| 23 | fPipelineForFills->visitProxies(fn); |
| 24 | } else { |
| 25 | fProcessors.visitProxies(fn); |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | GrDrawOp::FixedFunctionFlags GrPathInnerTriangulateOp::fixedFunctionFlags() const { |
| 30 | auto flags = FixedFunctionFlags::kUsesStencil; |
| 31 | if (GrAAType::kNone != fAAType) { |
| 32 | flags |= FixedFunctionFlags::kUsesHWAA; |
| 33 | } |
| 34 | return flags; |
| 35 | } |
| 36 | |
| 37 | GrProcessorSet::Analysis GrPathInnerTriangulateOp::finalize(const GrCaps& caps, |
| 38 | const GrAppliedClip* clip, |
Chris Dalton | ebb37e7 | 2021-01-27 17:59:45 -0700 | [diff] [blame] | 39 | GrClampType clampType) { |
Chris Dalton | 57ab06c | 2021-04-22 12:57:28 -0600 | [diff] [blame] | 40 | return fProcessors.finalize(fColor, GrProcessorAnalysisCoverage::kNone, clip, nullptr, caps, |
| 41 | clampType, &fColor); |
Chris Dalton | ebb37e7 | 2021-01-27 17:59:45 -0700 | [diff] [blame] | 42 | } |
| 43 | |
| 44 | void GrPathInnerTriangulateOp::pushFanStencilProgram(const GrPathShader::ProgramArgs& args, |
| 45 | const GrPipeline* pipelineForStencils, |
| 46 | const GrUserStencilSettings* stencil) { |
| 47 | SkASSERT(pipelineForStencils); |
| 48 | fFanPrograms.push_back(GrStencilPathShader::MakeStencilProgram<GrStencilTriangleShader>( |
| 49 | args, fViewMatrix, pipelineForStencils, stencil)); |
| 50 | } |
| 51 | |
| 52 | void GrPathInnerTriangulateOp::pushFanFillProgram(const GrPathShader::ProgramArgs& args, |
| 53 | const GrUserStencilSettings* stencil) { |
| 54 | SkASSERT(fPipelineForFills); |
| 55 | auto* shader = args.fArena->make<GrFillTriangleShader>(fViewMatrix, fColor); |
| 56 | fFanPrograms.push_back(GrPathShader::MakeProgram(args, shader, fPipelineForFills, stencil)); |
| 57 | } |
| 58 | |
| 59 | void GrPathInnerTriangulateOp::prePreparePrograms(const GrPathShader::ProgramArgs& args, |
| 60 | GrAppliedClip&& appliedClip) { |
| 61 | SkASSERT(!fFanTriangulator); |
| 62 | SkASSERT(!fFanPolys); |
| 63 | SkASSERT(!fPipelineForFills); |
| 64 | SkASSERT(!fTessellator); |
| 65 | SkASSERT(!fStencilCurvesProgram); |
| 66 | SkASSERT(fFanPrograms.empty()); |
| 67 | SkASSERT(!fFillHullsProgram); |
| 68 | |
| 69 | if (fPath.countVerbs() <= 0) { |
| 70 | return; |
| 71 | } |
| 72 | |
Chris Dalton | 57ab06c | 2021-04-22 12:57:28 -0600 | [diff] [blame] | 73 | // If using wireframe, we have to fall back on a standard Redbook "stencil then fill" algorithm |
| 74 | // instead of bypassing the stencil buffer to fill the fan directly. |
| 75 | bool forceRedbookStencilPass = (fOpFlags & (OpFlags::kStencilOnly | OpFlags::kWireframe)); |
Chris Dalton | ebb37e7 | 2021-01-27 17:59:45 -0700 | [diff] [blame] | 76 | bool doFill = !(fOpFlags & OpFlags::kStencilOnly); |
| 77 | |
| 78 | bool isLinear; |
| 79 | fFanTriangulator = args.fArena->make<GrInnerFanTriangulator>(fPath, args.fArena); |
| 80 | fFanPolys = fFanTriangulator->pathToPolys(&fFanBreadcrumbs, &isLinear); |
| 81 | |
| 82 | // Create a pipeline for stencil passes if needed. |
| 83 | const GrPipeline* pipelineForStencils = nullptr; |
| 84 | if (forceRedbookStencilPass || !isLinear) { // Curves always get stencilled. |
| 85 | pipelineForStencils = GrStencilPathShader::MakeStencilPassPipeline(args, fAAType, fOpFlags, |
| 86 | appliedClip.hardClip()); |
| 87 | } |
| 88 | |
| 89 | // Create a pipeline for fill passes if needed. |
| 90 | if (doFill) { |
| 91 | fPipelineForFills = GrFillPathShader::MakeFillPassPipeline(args, fAAType, |
| 92 | std::move(appliedClip), |
| 93 | std::move(fProcessors)); |
| 94 | } |
| 95 | |
| 96 | // Pass 1: Tessellate the outer curves into the stencil buffer. |
| 97 | if (!isLinear) { |
| 98 | // Always use indirect draws for now. Our goal in this op is to maximize GPU performance, |
| 99 | // and the middle-out topology used by indirect draws is easier on the rasterizer than what |
| 100 | // we can do with hw tessellation. So far we haven't found any platforms where trying to use |
| 101 | // hw tessellation here is worth it. |
| 102 | using DrawInnerFan = GrPathIndirectTessellator::DrawInnerFan; |
| 103 | fTessellator = args.fArena->make<GrPathIndirectTessellator>(fViewMatrix, fPath, |
| 104 | DrawInnerFan::kNo); |
Chris Dalton | a9f759d | 2021-05-18 12:37:08 -0600 | [diff] [blame] | 105 | fStencilCurvesProgram = GrStencilPathShader::MakeStencilProgram<GrCurveMiddleOutShader>( |
Chris Dalton | ebb37e7 | 2021-01-27 17:59:45 -0700 | [diff] [blame] | 106 | args, fViewMatrix, pipelineForStencils, fPath.getFillType()); |
| 107 | } |
| 108 | |
| 109 | // Pass 2: Fill the path's inner fan with a stencil test against the curves. |
| 110 | if (fFanPolys) { |
| 111 | if (forceRedbookStencilPass) { |
| 112 | // Use a standard Redbook "stencil then fill" algorithm instead of bypassing the stencil |
| 113 | // buffer to fill the fan directly. |
| 114 | this->pushFanStencilProgram( |
| 115 | args, pipelineForStencils, |
| 116 | GrStencilPathShader::StencilPassSettings(fPath.getFillType())); |
| 117 | if (doFill) { |
| 118 | this->pushFanFillProgram(args, GrFillPathShader::TestAndResetStencilSettings()); |
| 119 | } |
| 120 | } else if (isLinear) { |
| 121 | // There are no outer curves! Ignore stencil and fill the path directly. |
| 122 | SkASSERT(!pipelineForStencils); |
| 123 | this->pushFanFillProgram(args, &GrUserStencilSettings::kUnused); |
| 124 | } else if (!fPipelineForFills->hasStencilClip()) { |
| 125 | // These are a twist on the standard Redbook stencil settings that allow us to fill the |
| 126 | // inner polygon directly to the final render target. By the time these programs |
| 127 | // execute, the outer curves will already be stencilled in. So if the stencil value is |
| 128 | // zero, then it means the sample in question is not affected by any curves and we can |
| 129 | // fill it in directly. If the stencil value is nonzero, then we don't fill and instead |
| 130 | // continue the standard Redbook counting process. |
| 131 | constexpr static GrUserStencilSettings kFillOrIncrDecrStencil( |
| 132 | GrUserStencilSettings::StaticInitSeparate< |
| 133 | 0x0000, 0x0000, |
| 134 | GrUserStencilTest::kEqual, GrUserStencilTest::kEqual, |
| 135 | 0xffff, 0xffff, |
| 136 | GrUserStencilOp::kKeep, GrUserStencilOp::kKeep, |
| 137 | GrUserStencilOp::kIncWrap, GrUserStencilOp::kDecWrap, |
| 138 | 0xffff, 0xffff>()); |
| 139 | |
| 140 | constexpr static GrUserStencilSettings kFillOrInvertStencil( |
| 141 | GrUserStencilSettings::StaticInit< |
| 142 | 0x0000, |
| 143 | GrUserStencilTest::kEqual, |
| 144 | 0xffff, |
| 145 | GrUserStencilOp::kKeep, |
| 146 | // "Zero" instead of "Invert" because the fan only touches any given pixel once. |
| 147 | GrUserStencilOp::kZero, |
| 148 | 0xffff>()); |
| 149 | |
| 150 | auto* stencil = (fPath.getFillType() == SkPathFillType::kWinding) |
| 151 | ? &kFillOrIncrDecrStencil |
| 152 | : &kFillOrInvertStencil; |
| 153 | this->pushFanFillProgram(args, stencil); |
| 154 | } else { |
| 155 | // This is the same idea as above, but we use two passes instead of one because there is |
| 156 | // a stencil clip. The stencil test isn't expressive enough to do the above tests and |
| 157 | // also check the clip bit in a single pass. |
| 158 | constexpr static GrUserStencilSettings kFillIfZeroAndInClip( |
| 159 | GrUserStencilSettings::StaticInit< |
| 160 | 0x0000, |
| 161 | GrUserStencilTest::kEqualIfInClip, |
| 162 | 0xffff, |
| 163 | GrUserStencilOp::kKeep, |
| 164 | GrUserStencilOp::kKeep, |
| 165 | 0xffff>()); |
| 166 | |
| 167 | constexpr static GrUserStencilSettings kIncrDecrStencilIfNonzero( |
| 168 | GrUserStencilSettings::StaticInitSeparate< |
| 169 | 0x0000, 0x0000, |
| 170 | // No need to check the clip because the previous stencil pass will have only |
| 171 | // written to samples already inside the clip. |
| 172 | GrUserStencilTest::kNotEqual, GrUserStencilTest::kNotEqual, |
| 173 | 0xffff, 0xffff, |
| 174 | GrUserStencilOp::kIncWrap, GrUserStencilOp::kDecWrap, |
| 175 | GrUserStencilOp::kKeep, GrUserStencilOp::kKeep, |
| 176 | 0xffff, 0xffff>()); |
| 177 | |
| 178 | constexpr static GrUserStencilSettings kInvertStencilIfNonZero( |
| 179 | GrUserStencilSettings::StaticInit< |
| 180 | 0x0000, |
| 181 | // No need to check the clip because the previous stencil pass will have only |
| 182 | // written to samples already inside the clip. |
| 183 | GrUserStencilTest::kNotEqual, |
| 184 | 0xffff, |
| 185 | // "Zero" instead of "Invert" because the fan only touches any given pixel once. |
| 186 | GrUserStencilOp::kZero, |
| 187 | GrUserStencilOp::kKeep, |
| 188 | 0xffff>()); |
| 189 | |
| 190 | // Pass 2a: Directly fill fan samples whose stencil values (from curves) are zero. |
| 191 | this->pushFanFillProgram(args, &kFillIfZeroAndInClip); |
| 192 | |
| 193 | // Pass 2b: Redbook counting on fan samples whose stencil values (from curves) != 0. |
| 194 | auto* stencil = (fPath.getFillType() == SkPathFillType::kWinding) |
| 195 | ? &kIncrDecrStencilIfNonzero |
| 196 | : &kInvertStencilIfNonZero; |
| 197 | this->pushFanStencilProgram(args, pipelineForStencils, stencil); |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | // Pass 3: Draw convex hulls around each curve. |
| 202 | if (doFill && !isLinear) { |
| 203 | // By the time this program executes, every pixel will be filled in except the ones touched |
| 204 | // by curves. We issue a final cover pass over the curves by drawing their convex hulls. |
| 205 | // This will fill in any remaining samples and reset the stencil values back to zero. |
| 206 | SkASSERT(fTessellator); |
| 207 | auto* hullShader = args.fArena->make<GrFillCubicHullShader>(fViewMatrix, fColor); |
| 208 | fFillHullsProgram = GrPathShader::MakeProgram( |
| 209 | args, hullShader, fPipelineForFills, |
| 210 | GrFillPathShader::TestAndResetStencilSettings()); |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | void GrPathInnerTriangulateOp::onPrePrepare(GrRecordingContext* context, |
| 215 | const GrSurfaceProxyView& writeView, |
| 216 | GrAppliedClip* clip, |
| 217 | const GrXferProcessor::DstProxyView& dstProxyView, |
| 218 | GrXferBarrierFlags renderPassXferBarriers, |
| 219 | GrLoadOp colorLoadOp) { |
| 220 | this->prePreparePrograms({context->priv().recordTimeAllocator(), writeView, &dstProxyView, |
| 221 | renderPassXferBarriers, colorLoadOp, context->priv().caps()}, |
| 222 | (clip) ? std::move(*clip) : GrAppliedClip::Disabled()); |
| 223 | if (fStencilCurvesProgram) { |
| 224 | context->priv().recordProgramInfo(fStencilCurvesProgram); |
| 225 | } |
| 226 | for (const GrProgramInfo* fanProgram : fFanPrograms) { |
| 227 | context->priv().recordProgramInfo(fanProgram); |
| 228 | } |
| 229 | if (fFillHullsProgram) { |
| 230 | context->priv().recordProgramInfo(fFillHullsProgram); |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | void GrPathInnerTriangulateOp::onPrepare(GrOpFlushState* flushState) { |
| 235 | if (!fFanTriangulator) { |
| 236 | this->prePreparePrograms({flushState->allocator(), flushState->writeView(), |
| 237 | &flushState->dstProxyView(), flushState->renderPassBarriers(), |
| 238 | flushState->colorLoadOp(), &flushState->caps()}, |
| 239 | flushState->detachAppliedClip()); |
| 240 | if (!fFanTriangulator) { |
| 241 | return; |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | if (fFanPolys) { |
| 246 | GrEagerDynamicVertexAllocator alloc(flushState, &fFanBuffer, &fBaseFanVertex); |
| 247 | fFanVertexCount = fFanTriangulator->polysToTriangles(fFanPolys, &alloc, &fFanBreadcrumbs); |
| 248 | } |
| 249 | |
| 250 | if (fTessellator) { |
| 251 | // Must be called after polysToTriangles() in order for fFanBreadcrumbs to be complete. |
| 252 | fTessellator->prepare(flushState, fViewMatrix, fPath, &fFanBreadcrumbs); |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | void GrPathInnerTriangulateOp::onExecute(GrOpFlushState* flushState, const SkRect& chainBounds) { |
| 257 | if (fStencilCurvesProgram) { |
| 258 | SkASSERT(fTessellator); |
| 259 | flushState->bindPipelineAndScissorClip(*fStencilCurvesProgram, this->bounds()); |
| 260 | fTessellator->draw(flushState); |
| 261 | } |
| 262 | |
| 263 | for (const GrProgramInfo* fanProgram : fFanPrograms) { |
| 264 | SkASSERT(fFanBuffer); |
| 265 | flushState->bindPipelineAndScissorClip(*fanProgram, this->bounds()); |
Robert Phillips | 787fd9d | 2021-03-22 14:48:09 -0400 | [diff] [blame] | 266 | flushState->bindTextures(fanProgram->geomProc(), nullptr, fanProgram->pipeline()); |
Chris Dalton | ebb37e7 | 2021-01-27 17:59:45 -0700 | [diff] [blame] | 267 | flushState->bindBuffers(nullptr, nullptr, fFanBuffer); |
| 268 | flushState->draw(fFanVertexCount, fBaseFanVertex); |
| 269 | } |
| 270 | |
| 271 | if (fFillHullsProgram) { |
| 272 | SkASSERT(fTessellator); |
| 273 | flushState->bindPipelineAndScissorClip(*fFillHullsProgram, this->bounds()); |
Robert Phillips | 787fd9d | 2021-03-22 14:48:09 -0400 | [diff] [blame] | 274 | flushState->bindTextures(fFillHullsProgram->geomProc(), nullptr, *fPipelineForFills); |
Chris Dalton | ebb37e7 | 2021-01-27 17:59:45 -0700 | [diff] [blame] | 275 | fTessellator->drawHullInstances(flushState); |
| 276 | } |
| 277 | } |