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- /*
- * Copyright 2018 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "src/gpu/ops/GrFillRRectOp.h"
- #include "include/private/GrRecordingContext.h"
- #include "src/core/SkRRectPriv.h"
- #include "src/gpu/GrCaps.h"
- #include "src/gpu/GrGpuCommandBuffer.h"
- #include "src/gpu/GrMemoryPool.h"
- #include "src/gpu/GrOpFlushState.h"
- #include "src/gpu/GrRecordingContextPriv.h"
- #include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h"
- #include "src/gpu/glsl/GrGLSLGeometryProcessor.h"
- #include "src/gpu/glsl/GrGLSLVarying.h"
- #include "src/gpu/glsl/GrGLSLVertexGeoBuilder.h"
- // Hardware derivatives are not always accurate enough for highly elliptical corners. This method
- // checks to make sure the corners will still all look good if we use HW derivatives.
- static bool can_use_hw_derivatives_with_coverage(
- const GrShaderCaps&, const SkMatrix&, const SkRRect&);
- std::unique_ptr<GrFillRRectOp> GrFillRRectOp::Make(
- GrRecordingContext* ctx, GrAAType aaType, const SkMatrix& viewMatrix, const SkRRect& rrect,
- const GrCaps& caps, GrPaint&& paint) {
- if (!caps.instanceAttribSupport()) {
- return nullptr;
- }
- Flags flags = Flags::kNone;
- if (GrAAType::kCoverage == aaType) {
- // TODO: Support perspective in a follow-on CL. This shouldn't be difficult, since we
- // already use HW derivatives. The only trick will be adjusting the AA outset to account for
- // perspective. (i.e., outset = 0.5 * z.)
- if (viewMatrix.hasPerspective()) {
- return nullptr;
- }
- if (can_use_hw_derivatives_with_coverage(*caps.shaderCaps(), viewMatrix, rrect)) {
- // HW derivatives (more specifically, fwidth()) are consistently faster on all platforms
- // in coverage mode. We use them as long as the approximation will be accurate enough.
- flags |= Flags::kUseHWDerivatives;
- }
- } else {
- if (GrAAType::kMSAA == aaType) {
- if (!caps.sampleLocationsSupport() || !caps.shaderCaps()->sampleVariablesSupport()) {
- return nullptr;
- }
- }
- if (viewMatrix.hasPerspective()) {
- // HW derivatives are consistently slower on all platforms in sample mask mode. We
- // therefore only use them when there is perspective, since then we can't interpolate
- // the symbolic screen-space gradient.
- flags |= Flags::kUseHWDerivatives | Flags::kHasPerspective;
- }
- }
- // Produce a matrix that draws the round rect from normalized [-1, -1, +1, +1] space.
- float l = rrect.rect().left(), r = rrect.rect().right(),
- t = rrect.rect().top(), b = rrect.rect().bottom();
- SkMatrix m;
- // Unmap the normalized rect [-1, -1, +1, +1] back to [l, t, r, b].
- m.setScaleTranslate((r - l)/2, (b - t)/2, (l + r)/2, (t + b)/2);
- // Map to device space.
- m.postConcat(viewMatrix);
- SkRect devBounds;
- if (!(flags & Flags::kHasPerspective)) {
- // Since m is an affine matrix that maps the rect [-1, -1, +1, +1] into the shape's
- // device-space quad, it's quite simple to find the bounding rectangle:
- devBounds = SkRect::MakeXYWH(m.getTranslateX(), m.getTranslateY(), 0, 0);
- devBounds.outset(SkScalarAbs(m.getScaleX()) + SkScalarAbs(m.getSkewX()),
- SkScalarAbs(m.getSkewY()) + SkScalarAbs(m.getScaleY()));
- } else {
- viewMatrix.mapRect(&devBounds, rrect.rect());
- }
- if (GrAAType::kMSAA == aaType && caps.preferTrianglesOverSampleMask()) {
- // We are on a platform that prefers fine triangles instead of using the sample mask. See if
- // the round rect is large enough that it will be faster for us to send it off to the
- // default path renderer instead. The 200x200 threshold was arrived at using the
- // "shapes_rrect" benchmark on an ARM Galaxy S9.
- if (devBounds.height() * devBounds.width() > 200 * 200) {
- return nullptr;
- }
- }
- GrOpMemoryPool* pool = ctx->priv().opMemoryPool();
- return pool->allocate<GrFillRRectOp>(aaType, rrect, flags, m, std::move(paint), devBounds);
- }
- GrFillRRectOp::GrFillRRectOp(
- GrAAType aaType, const SkRRect& rrect, Flags flags,
- const SkMatrix& totalShapeMatrix, GrPaint&& paint, const SkRect& devBounds)
- : GrDrawOp(ClassID())
- , fAAType(aaType)
- , fOriginalColor(paint.getColor4f())
- , fLocalRect(rrect.rect())
- , fFlags(flags)
- , fProcessors(std::move(paint)) {
- SkASSERT((fFlags & Flags::kHasPerspective) == totalShapeMatrix.hasPerspective());
- this->setBounds(devBounds, GrOp::HasAABloat::kYes, GrOp::IsZeroArea::kNo);
- // Write the matrix attribs.
- const SkMatrix& m = totalShapeMatrix;
- if (!(fFlags & Flags::kHasPerspective)) {
- // Affine 2D transformation (float2x2 plus float2 translate).
- SkASSERT(!m.hasPerspective());
- this->writeInstanceData(m.getScaleX(), m.getSkewX(), m.getSkewY(), m.getScaleY());
- this->writeInstanceData(m.getTranslateX(), m.getTranslateY());
- } else {
- // Perspective float3x3 transformation matrix.
- SkASSERT(m.hasPerspective());
- m.get9(this->appendInstanceData<float>(9));
- }
- // Convert the radii to [-1, -1, +1, +1] space and write their attribs.
- Sk4f radiiX, radiiY;
- Sk4f::Load2(SkRRectPriv::GetRadiiArray(rrect), &radiiX, &radiiY);
- (radiiX * (2/rrect.width())).store(this->appendInstanceData<float>(4));
- (radiiY * (2/rrect.height())).store(this->appendInstanceData<float>(4));
- // We will write the color and local rect attribs during finalize().
- }
- GrProcessorSet::Analysis GrFillRRectOp::finalize(
- const GrCaps& caps, const GrAppliedClip* clip, bool hasMixedSampledCoverage,
- GrClampType clampType) {
- SkASSERT(1 == fInstanceCount);
- SkPMColor4f overrideColor;
- const GrProcessorSet::Analysis& analysis = fProcessors.finalize(
- fOriginalColor, GrProcessorAnalysisCoverage::kSingleChannel, clip,
- &GrUserStencilSettings::kUnused, hasMixedSampledCoverage, caps, clampType,
- &overrideColor);
- // Finish writing the instance attribs.
- SkPMColor4f finalColor = analysis.inputColorIsOverridden() ? overrideColor : fOriginalColor;
- if (!SkPMColor4fFitsInBytes(finalColor)) {
- fFlags |= Flags::kWideColor;
- uint32_t halfColor[2];
- SkFloatToHalf_finite_ftz(Sk4f::Load(finalColor.vec())).store(&halfColor);
- this->writeInstanceData(halfColor[0], halfColor[1]);
- } else {
- this->writeInstanceData(finalColor.toBytes_RGBA());
- }
- if (analysis.usesLocalCoords()) {
- this->writeInstanceData(fLocalRect);
- fFlags |= Flags::kHasLocalCoords;
- }
- fInstanceStride = fInstanceData.count();
- return analysis;
- }
- GrDrawOp::CombineResult GrFillRRectOp::onCombineIfPossible(GrOp* op, const GrCaps&) {
- const auto& that = *op->cast<GrFillRRectOp>();
- if (fFlags != that.fFlags || fProcessors != that.fProcessors ||
- fInstanceData.count() > std::numeric_limits<int>::max() - that.fInstanceData.count()) {
- return CombineResult::kCannotCombine;
- }
- fInstanceData.push_back_n(that.fInstanceData.count(), that.fInstanceData.begin());
- fInstanceCount += that.fInstanceCount;
- SkASSERT(fInstanceStride == that.fInstanceStride);
- return CombineResult::kMerged;
- }
- void GrFillRRectOp::onPrepare(GrOpFlushState* flushState) {
- if (void* instanceData = flushState->makeVertexSpace(fInstanceStride, fInstanceCount,
- &fInstanceBuffer, &fBaseInstance)) {
- SkASSERT(fInstanceStride * fInstanceCount == fInstanceData.count());
- memcpy(instanceData, fInstanceData.begin(), fInstanceData.count());
- }
- }
- class GrFillRRectOp::Processor : public GrGeometryProcessor {
- public:
- Processor(GrAAType aaType, Flags flags)
- : GrGeometryProcessor(kGrFillRRectOp_Processor_ClassID)
- , fAAType(aaType)
- , fFlags(flags) {
- int numVertexAttribs = (GrAAType::kCoverage == fAAType) ? 3 : 2;
- this->setVertexAttributes(kVertexAttribs, numVertexAttribs);
- if (!(flags & Flags::kHasPerspective)) {
- // Affine 2D transformation (float2x2 plus float2 translate).
- fInstanceAttribs.emplace_back("skew", kFloat4_GrVertexAttribType, kFloat4_GrSLType);
- fInstanceAttribs.emplace_back(
- "translate", kFloat2_GrVertexAttribType, kFloat2_GrSLType);
- } else {
- // Perspective float3x3 transformation matrix.
- fInstanceAttribs.emplace_back("persp_x", kFloat3_GrVertexAttribType, kFloat3_GrSLType);
- fInstanceAttribs.emplace_back("persp_y", kFloat3_GrVertexAttribType, kFloat3_GrSLType);
- fInstanceAttribs.emplace_back("persp_z", kFloat3_GrVertexAttribType, kFloat3_GrSLType);
- }
- fInstanceAttribs.emplace_back("radii_x", kFloat4_GrVertexAttribType, kFloat4_GrSLType);
- fInstanceAttribs.emplace_back("radii_y", kFloat4_GrVertexAttribType, kFloat4_GrSLType);
- fColorAttrib = &fInstanceAttribs.push_back(
- MakeColorAttribute("color", (flags & Flags::kWideColor)));
- if (fFlags & Flags::kHasLocalCoords) {
- fInstanceAttribs.emplace_back(
- "local_rect", kFloat4_GrVertexAttribType, kFloat4_GrSLType);
- }
- this->setInstanceAttributes(fInstanceAttribs.begin(), fInstanceAttribs.count());
- if (GrAAType::kMSAA == fAAType) {
- this->setWillUseCustomFeature(CustomFeatures::kSampleLocations);
- }
- }
- const char* name() const override { return "GrFillRRectOp::Processor"; }
- void getGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override {
- b->add32(((uint32_t)fFlags << 16) | (uint32_t)fAAType);
- }
- GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const override;
- private:
- static constexpr Attribute kVertexAttribs[] = {
- {"radii_selector", kFloat4_GrVertexAttribType, kFloat4_GrSLType},
- {"corner_and_radius_outsets", kFloat4_GrVertexAttribType, kFloat4_GrSLType},
- // Coverage only.
- {"aa_bloat_and_coverage", kFloat4_GrVertexAttribType, kFloat4_GrSLType}};
- const GrAAType fAAType;
- const Flags fFlags;
- SkSTArray<6, Attribute> fInstanceAttribs;
- const Attribute* fColorAttrib;
- class CoverageImpl;
- class MSAAImpl;
- };
- constexpr GrPrimitiveProcessor::Attribute GrFillRRectOp::Processor::kVertexAttribs[];
- // Our coverage geometry consists of an inset octagon with solid coverage, surrounded by linear
- // coverage ramps on the horizontal and vertical edges, and "arc coverage" pieces on the diagonal
- // edges. The Vertex struct tells the shader where to place its vertex within a normalized
- // ([l, t, r, b] = [-1, -1, +1, +1]) space, and how to calculate coverage. See onEmitCode.
- struct CoverageVertex {
- std::array<float, 4> fRadiiSelector;
- std::array<float, 2> fCorner;
- std::array<float, 2> fRadiusOutset;
- std::array<float, 2> fAABloatDirection;
- float fCoverage;
- float fIsLinearCoverage;
- };
- // This is the offset (when multiplied by radii) from the corners of a bounding box to the vertices
- // of its inscribed octagon. We draw the outside portion of arcs with quarter-octagons rather than
- // rectangles.
- static constexpr float kOctoOffset = 1/(1 + SK_ScalarRoot2Over2);
- static constexpr CoverageVertex kCoverageVertexData[] = {
- // Left inset edge.
- {{{0,0,0,1}}, {{-1,+1}}, {{0,-1}}, {{+1,0}}, 1, 1},
- {{{1,0,0,0}}, {{-1,-1}}, {{0,+1}}, {{+1,0}}, 1, 1},
- // Top inset edge.
- {{{1,0,0,0}}, {{-1,-1}}, {{+1,0}}, {{0,+1}}, 1, 1},
- {{{0,1,0,0}}, {{+1,-1}}, {{-1,0}}, {{0,+1}}, 1, 1},
- // Right inset edge.
- {{{0,1,0,0}}, {{+1,-1}}, {{0,+1}}, {{-1,0}}, 1, 1},
- {{{0,0,1,0}}, {{+1,+1}}, {{0,-1}}, {{-1,0}}, 1, 1},
- // Bottom inset edge.
- {{{0,0,1,0}}, {{+1,+1}}, {{-1,0}}, {{0,-1}}, 1, 1},
- {{{0,0,0,1}}, {{-1,+1}}, {{+1,0}}, {{0,-1}}, 1, 1},
- // Left outset edge.
- {{{0,0,0,1}}, {{-1,+1}}, {{0,-1}}, {{-1,0}}, 0, 1},
- {{{1,0,0,0}}, {{-1,-1}}, {{0,+1}}, {{-1,0}}, 0, 1},
- // Top outset edge.
- {{{1,0,0,0}}, {{-1,-1}}, {{+1,0}}, {{0,-1}}, 0, 1},
- {{{0,1,0,0}}, {{+1,-1}}, {{-1,0}}, {{0,-1}}, 0, 1},
- // Right outset edge.
- {{{0,1,0,0}}, {{+1,-1}}, {{0,+1}}, {{+1,0}}, 0, 1},
- {{{0,0,1,0}}, {{+1,+1}}, {{0,-1}}, {{+1,0}}, 0, 1},
- // Bottom outset edge.
- {{{0,0,1,0}}, {{+1,+1}}, {{-1,0}}, {{0,+1}}, 0, 1},
- {{{0,0,0,1}}, {{-1,+1}}, {{+1,0}}, {{0,+1}}, 0, 1},
- // Top-left corner.
- {{{1,0,0,0}}, {{-1,-1}}, {{ 0,+1}}, {{-1, 0}}, 0, 0},
- {{{1,0,0,0}}, {{-1,-1}}, {{ 0,+1}}, {{+1, 0}}, 1, 0},
- {{{1,0,0,0}}, {{-1,-1}}, {{+1, 0}}, {{ 0,+1}}, 1, 0},
- {{{1,0,0,0}}, {{-1,-1}}, {{+1, 0}}, {{ 0,-1}}, 0, 0},
- {{{1,0,0,0}}, {{-1,-1}}, {{+kOctoOffset,0}}, {{-1,-1}}, 0, 0},
- {{{1,0,0,0}}, {{-1,-1}}, {{0,+kOctoOffset}}, {{-1,-1}}, 0, 0},
- // Top-right corner.
- {{{0,1,0,0}}, {{+1,-1}}, {{-1, 0}}, {{ 0,-1}}, 0, 0},
- {{{0,1,0,0}}, {{+1,-1}}, {{-1, 0}}, {{ 0,+1}}, 1, 0},
- {{{0,1,0,0}}, {{+1,-1}}, {{ 0,+1}}, {{-1, 0}}, 1, 0},
- {{{0,1,0,0}}, {{+1,-1}}, {{ 0,+1}}, {{+1, 0}}, 0, 0},
- {{{0,1,0,0}}, {{+1,-1}}, {{0,+kOctoOffset}}, {{+1,-1}}, 0, 0},
- {{{0,1,0,0}}, {{+1,-1}}, {{-kOctoOffset,0}}, {{+1,-1}}, 0, 0},
- // Bottom-right corner.
- {{{0,0,1,0}}, {{+1,+1}}, {{ 0,-1}}, {{+1, 0}}, 0, 0},
- {{{0,0,1,0}}, {{+1,+1}}, {{ 0,-1}}, {{-1, 0}}, 1, 0},
- {{{0,0,1,0}}, {{+1,+1}}, {{-1, 0}}, {{ 0,-1}}, 1, 0},
- {{{0,0,1,0}}, {{+1,+1}}, {{-1, 0}}, {{ 0,+1}}, 0, 0},
- {{{0,0,1,0}}, {{+1,+1}}, {{-kOctoOffset,0}}, {{+1,+1}}, 0, 0},
- {{{0,0,1,0}}, {{+1,+1}}, {{0,-kOctoOffset}}, {{+1,+1}}, 0, 0},
- // Bottom-left corner.
- {{{0,0,0,1}}, {{-1,+1}}, {{+1, 0}}, {{ 0,+1}}, 0, 0},
- {{{0,0,0,1}}, {{-1,+1}}, {{+1, 0}}, {{ 0,-1}}, 1, 0},
- {{{0,0,0,1}}, {{-1,+1}}, {{ 0,-1}}, {{+1, 0}}, 1, 0},
- {{{0,0,0,1}}, {{-1,+1}}, {{ 0,-1}}, {{-1, 0}}, 0, 0},
- {{{0,0,0,1}}, {{-1,+1}}, {{0,-kOctoOffset}}, {{-1,+1}}, 0, 0},
- {{{0,0,0,1}}, {{-1,+1}}, {{+kOctoOffset,0}}, {{-1,+1}}, 0, 0}};
- GR_DECLARE_STATIC_UNIQUE_KEY(gCoverageVertexBufferKey);
- static constexpr uint16_t kCoverageIndexData[] = {
- // Inset octagon (solid coverage).
- 0, 1, 7,
- 1, 2, 7,
- 7, 2, 6,
- 2, 3, 6,
- 6, 3, 5,
- 3, 4, 5,
- // AA borders (linear coverage).
- 0, 1, 8, 1, 9, 8,
- 2, 3, 10, 3, 11, 10,
- 4, 5, 12, 5, 13, 12,
- 6, 7, 14, 7, 15, 14,
- // Top-left arc.
- 16, 17, 21,
- 17, 21, 18,
- 21, 18, 20,
- 18, 20, 19,
- // Top-right arc.
- 22, 23, 27,
- 23, 27, 24,
- 27, 24, 26,
- 24, 26, 25,
- // Bottom-right arc.
- 28, 29, 33,
- 29, 33, 30,
- 33, 30, 32,
- 30, 32, 31,
- // Bottom-left arc.
- 34, 35, 39,
- 35, 39, 36,
- 39, 36, 38,
- 36, 38, 37};
- GR_DECLARE_STATIC_UNIQUE_KEY(gCoverageIndexBufferKey);
- class GrFillRRectOp::Processor::CoverageImpl : public GrGLSLGeometryProcessor {
- void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
- const auto& proc = args.fGP.cast<Processor>();
- bool useHWDerivatives = (proc.fFlags & Flags::kUseHWDerivatives);
- SkASSERT(proc.vertexStride() == sizeof(CoverageVertex));
- GrGLSLVaryingHandler* varyings = args.fVaryingHandler;
- varyings->emitAttributes(proc);
- varyings->addPassThroughAttribute(*proc.fColorAttrib, args.fOutputColor,
- GrGLSLVaryingHandler::Interpolation::kCanBeFlat);
- // Emit the vertex shader.
- GrGLSLVertexBuilder* v = args.fVertBuilder;
- // Unpack vertex attribs.
- v->codeAppend("float2 corner = corner_and_radius_outsets.xy;");
- v->codeAppend("float2 radius_outset = corner_and_radius_outsets.zw;");
- v->codeAppend("float2 aa_bloat_direction = aa_bloat_and_coverage.xy;");
- v->codeAppend("float coverage = aa_bloat_and_coverage.z;");
- v->codeAppend("float is_linear_coverage = aa_bloat_and_coverage.w;");
- // Find the amount to bloat each edge for AA (in source space).
- v->codeAppend("float2 pixellength = inversesqrt("
- "float2(dot(skew.xz, skew.xz), dot(skew.yw, skew.yw)));");
- v->codeAppend("float4 normalized_axis_dirs = skew * pixellength.xyxy;");
- v->codeAppend("float2 axiswidths = (abs(normalized_axis_dirs.xy) + "
- "abs(normalized_axis_dirs.zw));");
- v->codeAppend("float2 aa_bloatradius = axiswidths * pixellength * .5;");
- // Identify our radii.
- v->codeAppend("float4 radii_and_neighbors = radii_selector"
- "* float4x4(radii_x, radii_y, radii_x.yxwz, radii_y.wzyx);");
- v->codeAppend("float2 radii = radii_and_neighbors.xy;");
- v->codeAppend("float2 neighbor_radii = radii_and_neighbors.zw;");
- v->codeAppend("if (any(greaterThan(aa_bloatradius, float2(1)))) {");
- // The rrect is more narrow than an AA coverage ramp. We can't draw as-is
- // or else opposite AA borders will overlap. Instead, fudge the size up to
- // the width of a coverage ramp, and then reduce total coverage to make
- // the rect appear more thin.
- v->codeAppend( "corner = max(abs(corner), aa_bloatradius) * sign(corner);");
- v->codeAppend( "coverage /= max(aa_bloatradius.x, 1) * max(aa_bloatradius.y, 1);");
- // Set radii to zero to ensure we take the "linear coverage" codepath.
- // (The "coverage" variable only has effect in the linear codepath.)
- v->codeAppend( "radii = float2(0);");
- v->codeAppend("}");
- v->codeAppend("if (any(lessThan(radii, aa_bloatradius * 1.25))) {");
- // The radii are very small. Demote this arc to a sharp 90 degree corner.
- v->codeAppend( "radii = aa_bloatradius;");
- // Snap octagon vertices to the corner of the bounding box.
- v->codeAppend( "radius_outset = floor(abs(radius_outset)) * radius_outset;");
- v->codeAppend( "is_linear_coverage = 1;");
- v->codeAppend("} else {");
- // Don't let radii get smaller than a pixel.
- v->codeAppend( "radii = clamp(radii, pixellength, 2 - pixellength);");
- v->codeAppend( "neighbor_radii = clamp(neighbor_radii, pixellength, 2 - pixellength);");
- // Don't let neighboring radii get closer together than 1/16 pixel.
- v->codeAppend( "float2 spacing = 2 - radii - neighbor_radii;");
- v->codeAppend( "float2 extra_pad = max(pixellength * .0625 - spacing, float2(0));");
- v->codeAppend( "radii -= extra_pad * .5;");
- v->codeAppend("}");
- // Find our vertex position, adjusted for radii and bloated for AA. Our rect is drawn in
- // normalized [-1,-1,+1,+1] space.
- v->codeAppend("float2 aa_outset = aa_bloat_direction.xy * aa_bloatradius;");
- v->codeAppend("float2 vertexpos = corner + radius_outset * radii + aa_outset;");
- // Emit transforms.
- GrShaderVar localCoord("", kFloat2_GrSLType);
- if (proc.fFlags & Flags::kHasLocalCoords) {
- v->codeAppend("float2 localcoord = (local_rect.xy * (1 - vertexpos) + "
- "local_rect.zw * (1 + vertexpos)) * .5;");
- localCoord.set(kFloat2_GrSLType, "localcoord");
- }
- this->emitTransforms(v, varyings, args.fUniformHandler, localCoord,
- args.fFPCoordTransformHandler);
- // Transform to device space.
- SkASSERT(!(proc.fFlags & Flags::kHasPerspective));
- v->codeAppend("float2x2 skewmatrix = float2x2(skew.xy, skew.zw);");
- v->codeAppend("float2 devcoord = vertexpos * skewmatrix + translate;");
- gpArgs->fPositionVar.set(kFloat2_GrSLType, "devcoord");
- // Setup interpolants for coverage.
- GrGLSLVarying arcCoord(useHWDerivatives ? kFloat2_GrSLType : kFloat4_GrSLType);
- varyings->addVarying("arccoord", &arcCoord);
- v->codeAppend("if (0 != is_linear_coverage) {");
- // We are a non-corner piece: Set x=0 to indicate built-in coverage, and
- // interpolate linear coverage across y.
- v->codeAppendf( "%s.xy = float2(0, coverage);", arcCoord.vsOut());
- v->codeAppend("} else {");
- // Find the normalized arc coordinates for our corner ellipse.
- // (i.e., the coordinate system where x^2 + y^2 == 1).
- v->codeAppend( "float2 arccoord = 1 - abs(radius_outset) + aa_outset/radii * corner;");
- // We are a corner piece: Interpolate the arc coordinates for coverage.
- // Emit x+1 to ensure no pixel in the arc has a x value of 0 (since x=0
- // instructs the fragment shader to use linear coverage).
- v->codeAppendf( "%s.xy = float2(arccoord.x+1, arccoord.y);", arcCoord.vsOut());
- if (!useHWDerivatives) {
- // The gradient is order-1: Interpolate it across arccoord.zw.
- v->codeAppendf("float2x2 derivatives = inverse(skewmatrix);");
- v->codeAppendf("%s.zw = derivatives * (arccoord/radii * 2);", arcCoord.vsOut());
- }
- v->codeAppend("}");
- // Emit the fragment shader.
- GrGLSLFPFragmentBuilder* f = args.fFragBuilder;
- f->codeAppendf("float x_plus_1=%s.x, y=%s.y;", arcCoord.fsIn(), arcCoord.fsIn());
- f->codeAppendf("half coverage;");
- f->codeAppendf("if (0 == x_plus_1) {");
- f->codeAppendf( "coverage = half(y);"); // We are a non-arc pixel (linear coverage).
- f->codeAppendf("} else {");
- f->codeAppendf( "float fn = x_plus_1 * (x_plus_1 - 2);"); // fn = (x+1)*(x-1) = x^2-1
- f->codeAppendf( "fn = fma(y,y, fn);"); // fn = x^2 + y^2 - 1
- if (useHWDerivatives) {
- f->codeAppendf("float fnwidth = fwidth(fn);");
- } else {
- // The gradient is interpolated across arccoord.zw.
- f->codeAppendf("float gx=%s.z, gy=%s.w;", arcCoord.fsIn(), arcCoord.fsIn());
- f->codeAppendf("float fnwidth = abs(gx) + abs(gy);");
- }
- f->codeAppendf( "half d = half(fn/fnwidth);");
- f->codeAppendf( "coverage = clamp(.5 - d, 0, 1);");
- f->codeAppendf("}");
- f->codeAppendf("%s = half4(coverage);", args.fOutputCoverage);
- }
- void setData(const GrGLSLProgramDataManager& pdman, const GrPrimitiveProcessor&,
- FPCoordTransformIter&& transformIter) override {
- this->setTransformDataHelper(SkMatrix::I(), pdman, &transformIter);
- }
- };
- // Our MSAA geometry consists of an inset octagon with full sample mask coverage, circumscribed
- // by a larger octagon that modifies the sample mask for the arc at each corresponding corner.
- struct MSAAVertex {
- std::array<float, 4> fRadiiSelector;
- std::array<float, 2> fCorner;
- std::array<float, 2> fRadiusOutset;
- };
- static constexpr MSAAVertex kMSAAVertexData[] = {
- // Left edge. (Negative radii selector indicates this is not an arc section.)
- {{{0,0,0,-1}}, {{-1,+1}}, {{0,-1}}},
- {{{-1,0,0,0}}, {{-1,-1}}, {{0,+1}}},
- // Top edge.
- {{{-1,0,0,0}}, {{-1,-1}}, {{+1,0}}},
- {{{0,-1,0,0}}, {{+1,-1}}, {{-1,0}}},
- // Right edge.
- {{{0,-1,0,0}}, {{+1,-1}}, {{0,+1}}},
- {{{0,0,-1,0}}, {{+1,+1}}, {{0,-1}}},
- // Bottom edge.
- {{{0,0,-1,0}}, {{+1,+1}}, {{-1,0}}},
- {{{0,0,0,-1}}, {{-1,+1}}, {{+1,0}}},
- // Top-left corner.
- {{{1,0,0,0}}, {{-1,-1}}, {{0,+1}}},
- {{{1,0,0,0}}, {{-1,-1}}, {{0,+kOctoOffset}}},
- {{{1,0,0,0}}, {{-1,-1}}, {{+1,0}}},
- {{{1,0,0,0}}, {{-1,-1}}, {{+kOctoOffset,0}}},
- // Top-right corner.
- {{{0,1,0,0}}, {{+1,-1}}, {{-1,0}}},
- {{{0,1,0,0}}, {{+1,-1}}, {{-kOctoOffset,0}}},
- {{{0,1,0,0}}, {{+1,-1}}, {{0,+1}}},
- {{{0,1,0,0}}, {{+1,-1}}, {{0,+kOctoOffset}}},
- // Bottom-right corner.
- {{{0,0,1,0}}, {{+1,+1}}, {{0,-1}}},
- {{{0,0,1,0}}, {{+1,+1}}, {{0,-kOctoOffset}}},
- {{{0,0,1,0}}, {{+1,+1}}, {{-1,0}}},
- {{{0,0,1,0}}, {{+1,+1}}, {{-kOctoOffset,0}}},
- // Bottom-left corner.
- {{{0,0,0,1}}, {{-1,+1}}, {{+1,0}}},
- {{{0,0,0,1}}, {{-1,+1}}, {{+kOctoOffset,0}}},
- {{{0,0,0,1}}, {{-1,+1}}, {{0,-1}}},
- {{{0,0,0,1}}, {{-1,+1}}, {{0,-kOctoOffset}}}};
- GR_DECLARE_STATIC_UNIQUE_KEY(gMSAAVertexBufferKey);
- static constexpr uint16_t kMSAAIndexData[] = {
- // Inset octagon. (Full sample mask.)
- 0, 1, 2,
- 0, 2, 3,
- 0, 3, 6,
- 3, 4, 5,
- 3, 5, 6,
- 6, 7, 0,
- // Top-left arc. (Sample mask is set to the arc.)
- 8, 9, 10,
- 9, 11, 10,
- // Top-right arc.
- 12, 13, 14,
- 13, 15, 14,
- // Bottom-right arc.
- 16, 17, 18,
- 17, 19, 18,
- // Bottom-left arc.
- 20, 21, 22,
- 21, 23, 22};
- GR_DECLARE_STATIC_UNIQUE_KEY(gMSAAIndexBufferKey);
- class GrFillRRectOp::Processor::MSAAImpl : public GrGLSLGeometryProcessor {
- void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
- const auto& proc = args.fGP.cast<Processor>();
- bool useHWDerivatives = (proc.fFlags & Flags::kUseHWDerivatives);
- bool hasPerspective = (proc.fFlags & Flags::kHasPerspective);
- bool hasLocalCoords = (proc.fFlags & Flags::kHasLocalCoords);
- SkASSERT(useHWDerivatives == hasPerspective);
- SkASSERT(proc.vertexStride() == sizeof(MSAAVertex));
- // Emit the vertex shader.
- GrGLSLVertexBuilder* v = args.fVertBuilder;
- GrGLSLVaryingHandler* varyings = args.fVaryingHandler;
- varyings->emitAttributes(proc);
- varyings->addPassThroughAttribute(*proc.fColorAttrib, args.fOutputColor,
- GrGLSLVaryingHandler::Interpolation::kCanBeFlat);
- // Unpack vertex attribs.
- v->codeAppendf("float2 corner = corner_and_radius_outsets.xy;");
- v->codeAppendf("float2 radius_outset = corner_and_radius_outsets.zw;");
- // Identify our radii.
- v->codeAppend("float2 radii;");
- v->codeAppend("radii.x = dot(radii_selector, radii_x);");
- v->codeAppend("radii.y = dot(radii_selector, radii_y);");
- v->codeAppendf("bool is_arc_section = (radii.x > 0);");
- v->codeAppendf("radii = abs(radii);");
- // Find our vertex position, adjusted for radii. Our rect is drawn in normalized
- // [-1,-1,+1,+1] space.
- v->codeAppend("float2 vertexpos = corner + radius_outset * radii;");
- // Emit transforms.
- GrShaderVar localCoord("", kFloat2_GrSLType);
- if (hasLocalCoords) {
- v->codeAppend("float2 localcoord = (local_rect.xy * (1 - vertexpos) + "
- "local_rect.zw * (1 + vertexpos)) * .5;");
- localCoord.set(kFloat2_GrSLType, "localcoord");
- }
- this->emitTransforms(v, varyings, args.fUniformHandler, localCoord,
- args.fFPCoordTransformHandler);
- // Transform to device space.
- if (!hasPerspective) {
- v->codeAppend("float2x2 skewmatrix = float2x2(skew.xy, skew.zw);");
- v->codeAppend("float2 devcoord = vertexpos * skewmatrix + translate;");
- gpArgs->fPositionVar.set(kFloat2_GrSLType, "devcoord");
- } else {
- v->codeAppend("float3x3 persp_matrix = float3x3(persp_x, persp_y, persp_z);");
- v->codeAppend("float3 devcoord = float3(vertexpos, 1) * persp_matrix;");
- gpArgs->fPositionVar.set(kFloat3_GrSLType, "devcoord");
- }
- // Determine normalized arc coordinates for the implicit function.
- GrGLSLVarying arcCoord((useHWDerivatives) ? kFloat2_GrSLType : kFloat4_GrSLType);
- varyings->addVarying("arccoord", &arcCoord);
- v->codeAppendf("if (is_arc_section) {");
- v->codeAppendf( "%s.xy = 1 - abs(radius_outset);", arcCoord.vsOut());
- if (!useHWDerivatives) {
- // The gradient is order-1: Interpolate it across arccoord.zw.
- // This doesn't work with perspective.
- SkASSERT(!hasPerspective);
- v->codeAppendf("float2x2 derivatives = inverse(skewmatrix);");
- v->codeAppendf("%s.zw = derivatives * (%s.xy/radii * corner * 2);",
- arcCoord.vsOut(), arcCoord.vsOut());
- }
- v->codeAppendf("} else {");
- if (useHWDerivatives) {
- v->codeAppendf("%s = float2(0);", arcCoord.vsOut());
- } else {
- v->codeAppendf("%s = float4(0);", arcCoord.vsOut());
- }
- v->codeAppendf("}");
- // Emit the fragment shader.
- GrGLSLFPFragmentBuilder* f = args.fFragBuilder;
- f->codeAppendf("%s = half4(1);", args.fOutputCoverage);
- // If x,y == 0, then we are drawing a triangle that does not track an arc.
- f->codeAppendf("if (float2(0) != %s.xy) {", arcCoord.fsIn());
- f->codeAppendf( "float fn = dot(%s.xy, %s.xy) - 1;", arcCoord.fsIn(), arcCoord.fsIn());
- if (GrAAType::kMSAA == proc.fAAType) {
- using ScopeFlags = GrGLSLFPFragmentBuilder::ScopeFlags;
- if (!useHWDerivatives) {
- f->codeAppendf("float2 grad = %s.zw;", arcCoord.fsIn());
- f->applyFnToMultisampleMask("fn", "grad", ScopeFlags::kInsidePerPrimitiveBranch);
- } else {
- f->applyFnToMultisampleMask("fn", nullptr, ScopeFlags::kInsidePerPrimitiveBranch);
- }
- } else {
- f->codeAppendf("if (fn > 0) {");
- f->codeAppendf( "%s = half4(0);", args.fOutputCoverage);
- f->codeAppendf("}");
- }
- f->codeAppendf("}");
- }
- void setData(const GrGLSLProgramDataManager& pdman, const GrPrimitiveProcessor&,
- FPCoordTransformIter&& transformIter) override {
- this->setTransformDataHelper(SkMatrix::I(), pdman, &transformIter);
- }
- };
- GrGLSLPrimitiveProcessor* GrFillRRectOp::Processor::createGLSLInstance(
- const GrShaderCaps&) const {
- if (GrAAType::kCoverage != fAAType) {
- return new MSAAImpl();
- }
- return new CoverageImpl();
- }
- void GrFillRRectOp::onExecute(GrOpFlushState* flushState, const SkRect& chainBounds) {
- if (!fInstanceBuffer) {
- return; // Setup failed.
- }
- sk_sp<const GrBuffer> indexBuffer, vertexBuffer;
- int indexCount;
- if (GrAAType::kCoverage == fAAType) {
- GR_DEFINE_STATIC_UNIQUE_KEY(gCoverageIndexBufferKey);
- indexBuffer = flushState->resourceProvider()->findOrMakeStaticBuffer(
- GrGpuBufferType::kIndex, sizeof(kCoverageIndexData), kCoverageIndexData,
- gCoverageIndexBufferKey);
- GR_DEFINE_STATIC_UNIQUE_KEY(gCoverageVertexBufferKey);
- vertexBuffer = flushState->resourceProvider()->findOrMakeStaticBuffer(
- GrGpuBufferType::kVertex, sizeof(kCoverageVertexData), kCoverageVertexData,
- gCoverageVertexBufferKey);
- indexCount = SK_ARRAY_COUNT(kCoverageIndexData);
- } else {
- GR_DEFINE_STATIC_UNIQUE_KEY(gMSAAIndexBufferKey);
- indexBuffer = flushState->resourceProvider()->findOrMakeStaticBuffer(
- GrGpuBufferType::kIndex, sizeof(kMSAAIndexData), kMSAAIndexData,
- gMSAAIndexBufferKey);
- GR_DEFINE_STATIC_UNIQUE_KEY(gMSAAVertexBufferKey);
- vertexBuffer = flushState->resourceProvider()->findOrMakeStaticBuffer(
- GrGpuBufferType::kVertex, sizeof(kMSAAVertexData), kMSAAVertexData,
- gMSAAVertexBufferKey);
- indexCount = SK_ARRAY_COUNT(kMSAAIndexData);
- }
- if (!indexBuffer || !vertexBuffer) {
- return;
- }
- Processor proc(fAAType, fFlags);
- SkASSERT(proc.instanceStride() == (size_t)fInstanceStride);
- GrPipeline::InitArgs initArgs;
- if (GrAAType::kMSAA == fAAType) {
- initArgs.fInputFlags = GrPipeline::InputFlags::kHWAntialias;
- }
- initArgs.fCaps = &flushState->caps();
- initArgs.fDstProxy = flushState->drawOpArgs().fDstProxy;
- initArgs.fOutputSwizzle = flushState->drawOpArgs().fOutputSwizzle;
- auto clip = flushState->detachAppliedClip();
- GrPipeline::FixedDynamicState fixedDynamicState(clip.scissorState().rect());
- GrPipeline pipeline(initArgs, std::move(fProcessors), std::move(clip));
- GrMesh mesh(GrPrimitiveType::kTriangles);
- mesh.setIndexedInstanced(
- std::move(indexBuffer), indexCount, fInstanceBuffer, fInstanceCount, fBaseInstance,
- GrPrimitiveRestart::kNo);
- mesh.setVertexData(std::move(vertexBuffer));
- flushState->rtCommandBuffer()->draw(
- proc, pipeline, &fixedDynamicState, nullptr, &mesh, 1, this->bounds());
- }
- // Will the given corner look good if we use HW derivatives?
- static bool can_use_hw_derivatives_with_coverage(const Sk2f& devScale, const Sk2f& cornerRadii) {
- Sk2f devRadii = devScale * cornerRadii;
- if (devRadii[1] < devRadii[0]) {
- devRadii = SkNx_shuffle<1,0>(devRadii);
- }
- float minDevRadius = SkTMax(devRadii[0], 1.f); // Shader clamps radius at a minimum of 1.
- // Is the gradient smooth enough for this corner look ok if we use hardware derivatives?
- // This threshold was arrived at subjevtively on an NVIDIA chip.
- return minDevRadius * minDevRadius * 5 > devRadii[1];
- }
- static bool can_use_hw_derivatives_with_coverage(
- const Sk2f& devScale, const SkVector& cornerRadii) {
- return can_use_hw_derivatives_with_coverage(devScale, Sk2f::Load(&cornerRadii));
- }
- // Will the given round rect look good if we use HW derivatives?
- static bool can_use_hw_derivatives_with_coverage(
- const GrShaderCaps& shaderCaps, const SkMatrix& viewMatrix, const SkRRect& rrect) {
- if (!shaderCaps.shaderDerivativeSupport()) {
- return false;
- }
- Sk2f x = Sk2f(viewMatrix.getScaleX(), viewMatrix.getSkewX());
- Sk2f y = Sk2f(viewMatrix.getSkewY(), viewMatrix.getScaleY());
- Sk2f devScale = (x*x + y*y).sqrt();
- switch (rrect.getType()) {
- case SkRRect::kEmpty_Type:
- case SkRRect::kRect_Type:
- return true;
- case SkRRect::kOval_Type:
- case SkRRect::kSimple_Type:
- return can_use_hw_derivatives_with_coverage(devScale, rrect.getSimpleRadii());
- case SkRRect::kNinePatch_Type: {
- Sk2f r0 = Sk2f::Load(SkRRectPriv::GetRadiiArray(rrect));
- Sk2f r1 = Sk2f::Load(SkRRectPriv::GetRadiiArray(rrect) + 2);
- Sk2f minRadii = Sk2f::Min(r0, r1);
- Sk2f maxRadii = Sk2f::Max(r0, r1);
- return can_use_hw_derivatives_with_coverage(devScale, Sk2f(minRadii[0], maxRadii[1])) &&
- can_use_hw_derivatives_with_coverage(devScale, Sk2f(maxRadii[0], minRadii[1]));
- }
- case SkRRect::kComplex_Type: {
- for (int i = 0; i < 4; ++i) {
- auto corner = static_cast<SkRRect::Corner>(i);
- if (!can_use_hw_derivatives_with_coverage(devScale, rrect.radii(corner))) {
- return false;
- }
- }
- return true;
- }
- }
- SK_ABORT("Invalid round rect type.");
- return false; // Add this return to keep GCC happy.
- }
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