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 "GrShaderCaps.h"
9 #include "SkString.h"
10 #include "../private/GrGLSL.h"
11
GrGLSLSupportsNamedFragmentShaderOutputs(GrGLSLGeneration gen)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 k420_GrGLSLGeneration:
22 case k310es_GrGLSLGeneration:
23 case k320es_GrGLSLGeneration:
24 return true;
25 }
26 return false;
27 }
28
GrGLSLAppendDefaultFloatPrecisionDeclaration(GrSLPrecision p,const GrShaderCaps & shaderCaps,SkString * out)29 void GrGLSLAppendDefaultFloatPrecisionDeclaration(GrSLPrecision p,
30 const GrShaderCaps& shaderCaps,
31 SkString* out) {
32 if (shaderCaps.usesPrecisionModifiers()) {
33 switch (p) {
34 case kHigh_GrSLPrecision:
35 out->append("precision highp float;\n");
36 break;
37 case kMedium_GrSLPrecision:
38 out->append("precision mediump float;\n");
39 break;
40 case kLow_GrSLPrecision:
41 out->append("precision lowp float;\n");
42 break;
43 default:
44 SkFAIL("Unknown precision value.");
45 }
46 }
47 }
48
GrGLSLMulVarBy4f(SkString * outAppend,const char * vec4VarName,const GrGLSLExpr4 & mulFactor)49 void GrGLSLMulVarBy4f(SkString* outAppend, const char* vec4VarName, const GrGLSLExpr4& mulFactor) {
50 if (mulFactor.isOnes()) {
51 *outAppend = SkString();
52 }
53
54 if (mulFactor.isZeros()) {
55 outAppend->appendf("%s = vec4(0);", vec4VarName);
56 } else {
57 outAppend->appendf("%s *= %s;", vec4VarName, mulFactor.c_str());
58 }
59 }
60