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Unified Diff: src/gpu/GrOptDrawState.h

Issue 597323002: Split GrDrawState and GrOptDrawState into separate classes and remove base class. (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: More nits Created 6 years, 3 months ago
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Index: src/gpu/GrOptDrawState.h
diff --git a/src/gpu/GrOptDrawState.h b/src/gpu/GrOptDrawState.h
index b4f59d3a7b09f0dd1ff51f20ed6721318518f191..f0a726e9547d5d7bddffaf145a690ffcd0244432 100644
--- a/src/gpu/GrOptDrawState.h
+++ b/src/gpu/GrOptDrawState.h
@@ -9,17 +9,272 @@
#define GrOptDrawState_DEFINED
#include "GrDrawState.h"
-#include "GrRODrawState.h"
/**
- * Subclass of GrRODrawState that holds an optimized version of a GrDrawState. Like it's parent
- * it is meant to be an immutable class, and simply adds a few helpful data members not in the
- * base class.
+ * Class that holds an optimized version of a GrDrawState. It is meant to be an immutable class,
+ * and contains all data needed to set the state for a gpu draw.
*/
-class GrOptDrawState : public GrRODrawState {
+class GrOptDrawState : public SkRefCnt {
public:
bool operator== (const GrOptDrawState& that) const;
+ ///////////////////////////////////////////////////////////////////////////
+ /// @name Vertex Attributes
+ ////
+
+ enum {
+ kMaxVertexAttribCnt = kLast_GrVertexAttribBinding + 4,
+ };
+
+ const GrVertexAttrib* getVertexAttribs() const { return fVAPtr; }
+ int getVertexAttribCount() const { return fVACount; }
+
+ size_t getVertexStride() const { return fVAStride; }
+
+ /**
+ * Getters for index into getVertexAttribs() for particular bindings. -1 is returned if the
+ * binding does not appear in the current attribs. These bindings should appear only once in
+ * the attrib array.
+ */
+
+ int positionAttributeIndex() const {
+ return fFixedFunctionVertexAttribIndices[kPosition_GrVertexAttribBinding];
+ }
+ int localCoordAttributeIndex() const {
+ return fFixedFunctionVertexAttribIndices[kLocalCoord_GrVertexAttribBinding];
+ }
+ int colorVertexAttributeIndex() const {
+ return fFixedFunctionVertexAttribIndices[kColor_GrVertexAttribBinding];
+ }
+ int coverageVertexAttributeIndex() const {
+ return fFixedFunctionVertexAttribIndices[kCoverage_GrVertexAttribBinding];
+ }
+
+ bool hasLocalCoordAttribute() const {
+ return -1 != fFixedFunctionVertexAttribIndices[kLocalCoord_GrVertexAttribBinding];
+ }
+ bool hasColorVertexAttribute() const {
+ return -1 != fFixedFunctionVertexAttribIndices[kColor_GrVertexAttribBinding];
+ }
+ bool hasCoverageVertexAttribute() const {
+ return -1 != fFixedFunctionVertexAttribIndices[kCoverage_GrVertexAttribBinding];
+ }
+
+ /// @}
+
+ ///////////////////////////////////////////////////////////////////////////
+ /// @name Color
+ ////
+
+ GrColor getColor() const { return fColor; }
+
+ /// @}
+
+ ///////////////////////////////////////////////////////////////////////////
+ /// @name Coverage
+ ////
+
+ uint8_t getCoverage() const { return fCoverage; }
+
+ GrColor getCoverageColor() const {
+ return GrColorPackRGBA(fCoverage, fCoverage, fCoverage, fCoverage);
+ }
+
+ /// @}
+
+ ///////////////////////////////////////////////////////////////////////////
+ /// @name Effect Stages
+ /// Each stage hosts a GrProcessor. The effect produces an output color or coverage in the
+ /// fragment shader. Its inputs are the output from the previous stage as well as some variables
+ /// available to it in the fragment and vertex shader (e.g. the vertex position, the dst color,
+ /// the fragment position, local coordinates).
+ ///
+ /// The stages are divided into two sets, color-computing and coverage-computing. The final
+ /// color stage produces the final pixel color. The coverage-computing stages function exactly
+ /// as the color-computing but the output of the final coverage stage is treated as a fractional
+ /// pixel coverage rather than as input to the src/dst color blend step.
+ ///
+ /// The input color to the first color-stage is either the constant color or interpolated
+ /// per-vertex colors. The input to the first coverage stage is either a constant coverage
+ /// (usually full-coverage) or interpolated per-vertex coverage.
+ ///
+ /// See the documentation of kCoverageDrawing_StateBit for information about disabling the
+ /// the color / coverage distinction.
+ ////
+
+ int numColorStages() const { return fColorStages.count(); }
+ int numCoverageStages() const { return fCoverageStages.count(); }
+ int numTotalStages() const {
+ return this->numColorStages() + this->numCoverageStages() +
+ (this->hasGeometryProcessor() ? 1 : 0);
+ }
+
+ bool hasGeometryProcessor() const { return SkToBool(fGeometryProcessor.get()); }
+ const GrGeometryStage* getGeometryProcessor() const { return fGeometryProcessor.get(); }
+ const GrFragmentStage& getColorStage(int idx) const { return fColorStages[idx]; }
+ const GrFragmentStage& getCoverageStage(int idx) const { return fCoverageStages[idx]; }
+
+ /// @}
+
+ ///////////////////////////////////////////////////////////////////////////
+ /// @name Blending
+ ////
+
+ GrBlendCoeff getSrcBlendCoeff() const { return fSrcBlend; }
+ GrBlendCoeff getDstBlendCoeff() const { return fDstBlend; }
+
+ /**
+ * Retrieves the last value set by setBlendConstant()
+ * @return the blending constant value
+ */
+ GrColor getBlendConstant() const { return fBlendConstant; }
+
+ /// @}
+
+ ///////////////////////////////////////////////////////////////////////////
+ /// @name View Matrix
+ ////
+
+ /**
+ * Retrieves the current view matrix
+ * @return the current view matrix.
+ */
+ const SkMatrix& getViewMatrix() const { return fViewMatrix; }
+
+ /**
+ * Retrieves the inverse of the current view matrix.
+ *
+ * If the current view matrix is invertible, return true, and if matrix
+ * is non-null, copy the inverse into it. If the current view matrix is
+ * non-invertible, return false and ignore the matrix parameter.
+ *
+ * @param matrix if not null, will receive a copy of the current inverse.
+ */
+ bool getViewInverse(SkMatrix* matrix) const {
+ SkMatrix inverse;
+ if (fViewMatrix.invert(&inverse)) {
+ if (matrix) {
+ *matrix = inverse;
+ }
+ return true;
+ }
+ return false;
+ }
+
+ /// @}
+
+ ///////////////////////////////////////////////////////////////////////////
+ /// @name Render Target
+ ////
+
+ /**
+ * Retrieves the currently set render-target.
+ *
+ * @return The currently set render target.
+ */
+ GrRenderTarget* getRenderTarget() const {
+ return static_cast<GrRenderTarget*>(fRenderTarget.getResource());
+ }
+
+ /// @}
+
+ ///////////////////////////////////////////////////////////////////////////
+ /// @name Stencil
+ ////
+
+ const GrStencilSettings& getStencil() const { return fStencilSettings; }
+
+ /// @}
+
+ ///////////////////////////////////////////////////////////////////////////
+ /// @name State Flags
+ ////
+
+ /**
+ * Flags that affect rendering. Controlled using enable/disableState(). All
+ * default to disabled.
+ */
+ enum StateBits {
+ /**
+ * Perform dithering. TODO: Re-evaluate whether we need this bit
+ */
+ kDither_StateBit = 0x01,
+ /**
+ * Perform HW anti-aliasing. This means either HW FSAA, if supported by the render target,
+ * or smooth-line rendering if a line primitive is drawn and line smoothing is supported by
+ * the 3D API.
+ */
+ kHWAntialias_StateBit = 0x02,
+ /**
+ * Draws will respect the clip, otherwise the clip is ignored.
+ */
+ kClip_StateBit = 0x04,
+ /**
+ * Disables writing to the color buffer. Useful when performing stencil
+ * operations.
+ */
+ kNoColorWrites_StateBit = 0x08,
+
+ /**
+ * Usually coverage is applied after color blending. The color is blended using the coeffs
+ * specified by setBlendFunc(). The blended color is then combined with dst using coeffs
+ * of src_coverage, 1-src_coverage. Sometimes we are explicitly drawing a coverage mask. In
+ * this case there is no distinction between coverage and color and the caller needs direct
+ * control over the blend coeffs. When set, there will be a single blend step controlled by
+ * setBlendFunc() which will use coverage*color as the src color.
+ */
+ kCoverageDrawing_StateBit = 0x10,
+
+ // Users of the class may add additional bits to the vector
+ kDummyStateBit,
+ kLastPublicStateBit = kDummyStateBit-1,
+ };
+
+ bool isStateFlagEnabled(uint32_t stateBit) const { return 0 != (stateBit & fFlagBits); }
+
+ bool isDitherState() const { return 0 != (fFlagBits & kDither_StateBit); }
+ bool isHWAntialiasState() const { return 0 != (fFlagBits & kHWAntialias_StateBit); }
+ bool isClipState() const { return 0 != (fFlagBits & kClip_StateBit); }
+ bool isColorWriteDisabled() const { return 0 != (fFlagBits & kNoColorWrites_StateBit); }
+ bool isCoverageDrawing() const { return 0 != (fFlagBits & kCoverageDrawing_StateBit); }
+
+ /// @}
+
+ ///////////////////////////////////////////////////////////////////////////
+ /// @name Face Culling
+ ////
+
+ enum DrawFace {
+ kInvalid_DrawFace = -1,
+
+ kBoth_DrawFace,
+ kCCW_DrawFace,
+ kCW_DrawFace,
+ };
+
+ /**
+ * Gets whether the target is drawing clockwise, counterclockwise,
+ * or both faces.
+ * @return the current draw face(s).
+ */
+ DrawFace getDrawFace() const { return fDrawFace; }
+
+ /// @}
+
+ ///////////////////////////////////////////////////////////////////////////
+
+ /** Return type for CombineIfPossible. */
+ enum CombinedState {
+ /** The GrDrawStates cannot be combined. */
+ kIncompatible_CombinedState,
+ /** Either draw state can be used in place of the other. */
+ kAOrB_CombinedState,
+ /** Use the first draw state. */
+ kA_CombinedState,
+ /** Use the second draw state. */
+ kB_CombinedState,
+ };
+
bool inputColorIsUsed() const { return fInputColorIsUsed; }
bool inputCoverageIsUsed() const { return fInputCoverageIsUsed; }
@@ -64,6 +319,35 @@ public:
private:
/**
+ * Optimizations for blending / coverage to that can be applied based on the current state.
+ */
+ enum BlendOptFlags {
+ /**
+ * No optimization
+ */
+ kNone_BlendOpt = 0,
+ /**
+ * Don't draw at all
+ */
+ kSkipDraw_BlendOptFlag = 0x1,
+ /**
+ * The coverage value does not have to be computed separately from alpha, the the output
+ * color can be the modulation of the two.
+ */
+ kCoverageAsAlpha_BlendOptFlag = 0x2,
+ /**
+ * Instead of emitting a src color, emit coverage in the alpha channel and r,g,b are
+ * "don't cares".
+ */
+ kEmitCoverage_BlendOptFlag = 0x4,
+ /**
+ * Emit transparent black instead of the src color, no need to compute coverage.
+ */
+ kEmitTransBlack_BlendOptFlag = 0x8,
+ };
+ GR_DECL_BITFIELD_OPS_FRIENDS(BlendOptFlags);
+
+ /**
* Constructs and optimized drawState out of a GrRODrawState.
*/
GrOptDrawState(const GrDrawState& drawState, BlendOptFlags blendOptFlags,
@@ -114,6 +398,33 @@ private:
*/
void setOutputStateInfo(const GrDrawTargetCaps&);
+ bool isEqual(const GrOptDrawState& that) const;
+
+ // These fields are roughly sorted by decreasing likelihood of being different in op==
+ typedef GrTGpuResourceRef<GrRenderTarget> ProgramRenderTarget;
+ ProgramRenderTarget fRenderTarget;
+ GrColor fColor;
+ SkMatrix fViewMatrix;
+ GrColor fBlendConstant;
+ uint32_t fFlagBits;
+ const GrVertexAttrib* fVAPtr;
+ int fVACount;
+ size_t fVAStride;
+ GrStencilSettings fStencilSettings;
+ uint8_t fCoverage;
+ DrawFace fDrawFace;
+ GrBlendCoeff fSrcBlend;
+ GrBlendCoeff fDstBlend;
+
+ typedef SkSTArray<4, GrFragmentStage> FragmentStageArray;
+ SkAutoTDelete<GrGeometryStage> fGeometryProcessor;
+ FragmentStageArray fColorStages;
+ FragmentStageArray fCoverageStages;
+
+ // This is simply a different representation of info in fVertexAttribs and thus does
+ // not need to be compared in op==.
+ int fFixedFunctionVertexAttribIndices[kGrFixedFunctionVertexAttribBindingCnt];
+
// These flags are needed to protect the code from creating an unused uniform color/coverage
// which will cause shader compiler errors.
bool fInputColorIsUsed;
@@ -133,7 +444,10 @@ private:
SecondaryOutputType fSecondaryOutputType : 8;
friend GrOptDrawState* GrDrawState::createOptState(const GrDrawTargetCaps&) const;
- typedef GrRODrawState INHERITED;
+ typedef SkRefCnt INHERITED;
};
+GR_MAKE_BITFIELD_OPS(GrOptDrawState::BlendOptFlags);
+
#endif
+
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