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* Copyright 2012 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef GrShaderCaps_DEFINED
#define GrShaderCaps_DEFINED
#include "include/core/SkRefCnt.h"
#include "src/sksl/SkSLUtil.h"
struct GrContextOptions;
class SkJSONWriter;
struct GrShaderCaps : SkSL::ShaderCaps {
GrShaderCaps() {}
void dumpJSON(SkJSONWriter*) const;
const char* noperspectiveInterpolationExtensionString() const {
return fNoPerspectiveInterpolationExtensionString;
const char* sampleVariablesExtensionString() const {
return fSampleVariablesExtensionString;
void applyOptionsOverrides(const GrContextOptions& options);
bool fDstReadInShaderSupport = false;
bool fDualSourceBlendingSupport = false;
bool fPreferFlatInterpolation = false;
bool fVertexIDSupport = false;
// Returns true if `expr` in `myArray[expr]` can be any integer expression. If false, `expr`
// must be a constant-index-expression as defined in the OpenGL ES2 specification, Appendix A.5.
bool fNonconstantArrayIndexSupport = false;
// frexp(), ldexp(), findMSB(), findLSB().
bool fBitManipulationSupport = false;
bool fHalfIs32Bits = false;
bool fHasLowFragmentPrecision = false;
// Use a reduced set of rendering algorithms or less optimal effects in order to reduce the
// number of unique shaders generated.
bool fReducedShaderMode = false;
// Used for specific driver bug workarounds
bool fRequiresLocalOutputColorForFBFetch = false;
// Workaround for Mali GPU opacity bug with uniform colors.
bool fMustObfuscateUniformColor = false;
// On Nexus 6, the GL context can get lost if a shader does not write a value to gl_FragColor.
bool fMustWriteToFragColor = false;
bool fColorSpaceMathNeedsFloat = false;
// When we have the option of using either dFdx or dfDy in a shader, this returns whether we
// should avoid using dFdx. We have found some drivers have bugs or lower precision when using
// dFdx.
bool fAvoidDfDxForGradientsWhenPossible = false;
// This contains the name of an extension that must be enabled in the shader, if such a thing is
// required in order to use a secondary output in the shader. This returns a nullptr if no such
// extension is required. However, the return value of this function does not say whether dual
// source blending is supported.
const char* fSecondaryOutputExtensionString = nullptr;
const char* fNoPerspectiveInterpolationExtensionString = nullptr;
const char* fSampleVariablesExtensionString = nullptr;
const char* fFBFetchExtensionString = nullptr;
int fMaxFragmentSamplers = 0;