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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.
*/
#include "GrShaderCaps.h"
#include "GrContextOptions.h"
#include "SkJSONWriter.h"
////////////////////////////////////////////////////////////////////////////////////////////
static const char* shader_type_to_string(GrShaderType type) {
switch (type) {
case kVertex_GrShaderType:
return "vertex";
case kGeometry_GrShaderType:
return "geometry";
case kFragment_GrShaderType:
return "fragment";
}
return "";
}
static const char* precision_to_string(GrSLPrecision p) {
switch (p) {
case kLow_GrSLPrecision:
return "low";
case kMedium_GrSLPrecision:
return "medium";
case kHigh_GrSLPrecision:
return "high";
default:
SK_ABORT("Unexpected precision type.");
return "";
}
}
GrShaderCaps::GrShaderCaps(const GrContextOptions& options) {
fGLSLGeneration = k330_GrGLSLGeneration;
fShaderDerivativeSupport = false;
fGeometryShaderSupport = false;
fPathRenderingSupport = false;
fDstReadInShaderSupport = false;
fDualSourceBlendingSupport = false;
fIntegerSupport = false;
fTexelBufferSupport = false;
fImageLoadStoreSupport = false;
fShaderPrecisionVaries = false;
fDropsTileOnZeroDivide = false;
fFBFetchSupport = false;
fFBFetchNeedsCustomOutput = false;
fBindlessTextureSupport = false;
fUsesPrecisionModifiers = false;
fCanUseAnyFunctionInShader = true;
fCanUseMinAndAbsTogether = true;
fCanUseFractForNegativeValues = true;
fMustForceNegatedAtanParamToFloat = false;
fAtan2ImplementedAsAtanYOverX = false;
fRequiresLocalOutputColorForFBFetch = false;
fMustImplementGSInvocationsWithLoop = false;
fMustObfuscateUniformColor = false;
fMustGuardDivisionEvenAfterExplicitZeroCheck = false;
fFlatInterpolationSupport = false;
fNoPerspectiveInterpolationSupport = false;
fMultisampleInterpolationSupport = false;
fSampleVariablesSupport = false;
fSampleMaskOverrideCoverageSupport = false;
fExternalTextureSupport = false;
fTexelFetchSupport = false;
fVertexIDSupport = false;
fVersionDeclString = nullptr;
fShaderDerivativeExtensionString = nullptr;
fFragCoordConventionsExtensionString = nullptr;
fSecondaryOutputExtensionString = nullptr;
fExternalTextureExtensionString = nullptr;
fTexelBufferExtensionString = nullptr;
fNoPerspectiveInterpolationExtensionString = nullptr;
fMultisampleInterpolationExtensionString = nullptr;
fSampleVariablesExtensionString = nullptr;
fFBFetchColorName = nullptr;
fFBFetchExtensionString = nullptr;
fImageLoadStoreExtensionString = nullptr;
fMaxVertexSamplers = 0;
fMaxGeometrySamplers = 0;
fMaxFragmentSamplers = 0;
fMaxCombinedSamplers = 0;
fMaxVertexImageStorages = 0;
fMaxGeometryImageStorages = 0;
fMaxFragmentImageStorages = 0;
fMaxCombinedImageStorages = 0;
fAdvBlendEqInteraction = kNotSupported_AdvBlendEqInteraction;
}
void GrShaderCaps::dumpJSON(SkJSONWriter* writer) const {
writer->beginObject();
writer->appendBool("Shader Derivative Support", fShaderDerivativeSupport);
writer->appendBool("Geometry Shader Support", fGeometryShaderSupport);
writer->appendBool("Path Rendering Support", fPathRenderingSupport);
writer->appendBool("Dst Read In Shader Support", fDstReadInShaderSupport);
writer->appendBool("Dual Source Blending Support", fDualSourceBlendingSupport);
writer->appendBool("Integer Support", fIntegerSupport);
writer->appendBool("Texel Buffer Support", fTexelBufferSupport);
writer->appendBool("Image Load Store Support", fImageLoadStoreSupport);
writer->appendBool("Variable Precision", fShaderPrecisionVaries);
for (int s = 0; s < kGrShaderTypeCount; ++s) {
GrShaderType shaderType = static_cast<GrShaderType>(s);
writer->beginArray(SkStringPrintf("%s precisions",
shader_type_to_string(shaderType)).c_str());
for (int p = 0; p < kGrSLPrecisionCount; ++p) {
if (fFloatPrecisions[s][p].supported()) {
GrSLPrecision precision = static_cast<GrSLPrecision>(p);
writer->beginObject(nullptr, false);
writer->appendString("precision", precision_to_string(precision));
writer->appendS32("log_low", fFloatPrecisions[s][p].fLogRangeLow);
writer->appendS32("log_high", fFloatPrecisions[s][p].fLogRangeHigh);
writer->appendS32("bits", fFloatPrecisions[s][p].fBits);
writer->endObject();
}
}
writer->endArray();
}
static const char* kAdvBlendEqInteractionStr[] = {
"Not Supported",
"Automatic",
"General Enable",
"Specific Enables",
};
GR_STATIC_ASSERT(0 == kNotSupported_AdvBlendEqInteraction);
GR_STATIC_ASSERT(1 == kAutomatic_AdvBlendEqInteraction);
GR_STATIC_ASSERT(2 == kGeneralEnable_AdvBlendEqInteraction);
GR_STATIC_ASSERT(3 == kSpecificEnables_AdvBlendEqInteraction);
GR_STATIC_ASSERT(SK_ARRAY_COUNT(kAdvBlendEqInteractionStr) == kLast_AdvBlendEqInteraction + 1);
writer->appendBool("FB Fetch Support", fFBFetchSupport);
writer->appendBool("Drops tile on zero divide", fDropsTileOnZeroDivide);
writer->appendBool("Bindless texture support", fBindlessTextureSupport);
writer->appendBool("Uses precision modifiers", fUsesPrecisionModifiers);
writer->appendBool("Can use any() function", fCanUseAnyFunctionInShader);
writer->appendBool("Can use min() and abs() together", fCanUseMinAndAbsTogether);
writer->appendBool("Can use fract() for negative values", fCanUseFractForNegativeValues);
writer->appendBool("Must force negated atan param to float", fMustForceNegatedAtanParamToFloat);
writer->appendBool("Must use local out color for FBFetch", fRequiresLocalOutputColorForFBFetch);
writer->appendBool("Must implement geo shader invocations with loop",
fMustImplementGSInvocationsWithLoop);
writer->appendBool("Must obfuscate uniform color", fMustObfuscateUniformColor);
writer->appendBool("Must guard division even after explicit zero check",
fMustGuardDivisionEvenAfterExplicitZeroCheck);
writer->appendBool("Flat interpolation support", fFlatInterpolationSupport);
writer->appendBool("No perspective interpolation support", fNoPerspectiveInterpolationSupport);
writer->appendBool("Multisample interpolation support", fMultisampleInterpolationSupport);
writer->appendBool("Sample variables support", fSampleVariablesSupport);
writer->appendBool("Sample mask override coverage support", fSampleMaskOverrideCoverageSupport);
writer->appendBool("External texture support", fExternalTextureSupport);
writer->appendBool("texelFetch support", fTexelFetchSupport);
writer->appendBool("sk_VertexID support", fVertexIDSupport);
writer->appendS32("Max VS Samplers", fMaxVertexSamplers);
writer->appendS32("Max GS Samplers", fMaxGeometrySamplers);
writer->appendS32("Max FS Samplers", fMaxFragmentSamplers);
writer->appendS32("Max Combined Samplers", fMaxFragmentSamplers);
writer->appendS32("Max VS Image Storages", fMaxVertexImageStorages);
writer->appendS32("Max GS Image Storages", fMaxGeometryImageStorages);
writer->appendS32("Max FS Image Storages", fMaxFragmentImageStorages);
writer->appendS32("Max Combined Image Storages", fMaxFragmentImageStorages);
writer->appendString("Advanced blend equation interaction",
kAdvBlendEqInteractionStr[fAdvBlendEqInteraction]);
writer->endObject();
}
void GrShaderCaps::initSamplerPrecisionTable() {
// Determine the largest precision qualifiers that are effectively the same as lowp/mediump.
// e.g. if lowp == mediump, then use mediump instead of lowp.
GrSLPrecision effectiveMediumP[kGrShaderTypeCount];
GrSLPrecision effectiveLowP[kGrShaderTypeCount];
for (int s = 0; s < kGrShaderTypeCount; ++s) {
const PrecisionInfo* info = fFloatPrecisions[s];
effectiveMediumP[s] = info[kHigh_GrSLPrecision] == info[kMedium_GrSLPrecision] ?
kHigh_GrSLPrecision : kMedium_GrSLPrecision;
effectiveLowP[s] = info[kMedium_GrSLPrecision] == info[kLow_GrSLPrecision] ?
effectiveMediumP[s] : kLow_GrSLPrecision;
}
// Determine which precision qualifiers should be used with samplers.
for (int visibility = 0; visibility < (1 << kGrShaderTypeCount); ++visibility) {
GrSLPrecision mediump = kHigh_GrSLPrecision;
GrSLPrecision lowp = kHigh_GrSLPrecision;
for (int s = 0; s < kGrShaderTypeCount; ++s) {
if (visibility & (1 << s)) {
mediump = SkTMin(mediump, effectiveMediumP[s]);
lowp = SkTMin(lowp, effectiveLowP[s]);
}
GR_STATIC_ASSERT(0 == kLow_GrSLPrecision);
GR_STATIC_ASSERT(1 == kMedium_GrSLPrecision);
GR_STATIC_ASSERT(2 == kHigh_GrSLPrecision);
GR_STATIC_ASSERT((1 << kVertex_GrShaderType) == kVertex_GrShaderFlag);
GR_STATIC_ASSERT((1 << kGeometry_GrShaderType) == kGeometry_GrShaderFlag);
GR_STATIC_ASSERT((1 << kFragment_GrShaderType) == kFragment_GrShaderFlag);
GR_STATIC_ASSERT(3 == kGrShaderTypeCount);
}
uint8_t* table = fSamplerPrecisions[visibility];
table[kUnknown_GrPixelConfig] = lowp;
table[kAlpha_8_GrPixelConfig] = lowp;
table[kGray_8_GrPixelConfig] = lowp;
table[kRGB_565_GrPixelConfig] = lowp;
table[kRGBA_4444_GrPixelConfig] = lowp;
table[kRGBA_8888_GrPixelConfig] = lowp;
table[kBGRA_8888_GrPixelConfig] = lowp;
table[kSRGBA_8888_GrPixelConfig] = lowp;
table[kSBGRA_8888_GrPixelConfig] = lowp;
table[kRGBA_8888_sint_GrPixelConfig] = lowp;
table[kRGBA_float_GrPixelConfig] = kHigh_GrSLPrecision;
table[kRG_float_GrPixelConfig] = kHigh_GrSLPrecision;
table[kAlpha_half_GrPixelConfig] = mediump;
table[kRGBA_half_GrPixelConfig] = mediump;
GR_STATIC_ASSERT(14 == kGrPixelConfigCnt);
}
}
void GrShaderCaps::applyOptionsOverrides(const GrContextOptions& options) {
#if GR_TEST_UTILS
fDualSourceBlendingSupport = fDualSourceBlendingSupport && !options.fSuppressDualSourceBlending;
#endif
}
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