1 /* 2 * Copyright 2011 Google Inc. 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 "GrGLSL.h" 9 #include "GrGLSLCaps.h" 10 #include "SkString.h" 11 12 bool GrGLSLSupportsNamedFragmentShaderOutputs(GrGLSLGeneration gen) { 13 switch (gen) { 14 case k110_GrGLSLGeneration: 15 return false; 16 case k130_GrGLSLGeneration: 17 case k140_GrGLSLGeneration: 18 case k150_GrGLSLGeneration: 19 case k330_GrGLSLGeneration: 20 case k400_GrGLSLGeneration: 21 case k310es_GrGLSLGeneration: 22 case k320es_GrGLSLGeneration: 23 return true; 24 } 25 return false; 26 } 27 28 void GrGLSLAppendDefaultFloatPrecisionDeclaration(GrSLPrecision p, 29 const GrGLSLCaps& glslCaps, 30 SkString* out) { 31 if (glslCaps.usesPrecisionModifiers()) { 32 switch (p) { 33 case kHigh_GrSLPrecision: 34 out->append("precision highp float;\n"); 35 break; 36 case kMedium_GrSLPrecision: 37 out->append("precision mediump float;\n"); 38 break; 39 case kLow_GrSLPrecision: 40 out->append("precision lowp float;\n"); 41 break; 42 default: 43 SkFAIL("Unknown precision value."); 44 } 45 } 46 } 47 48 void GrGLSLMulVarBy4f(SkString* outAppend, const char* vec4VarName, const GrGLSLExpr4& mulFactor) { 49 if (mulFactor.isOnes()) { 50 *outAppend = SkString(); 51 } 52 53 if (mulFactor.isZeros()) { 54 outAppend->appendf("%s = vec4(0);", vec4VarName); 55 } else { 56 outAppend->appendf("%s *= %s;", vec4VarName, mulFactor.c_str()); 57 } 58 } 59
