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      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 "GrGLShaderVar.h"
     10 #include "SkString.h"
     11 
     12 GrGLSLGeneration GrGetGLSLGeneration(GrGLBinding binding, const GrGLInterface* gl) {
     13     GrGLSLVersion ver = GrGLGetGLSLVersion(gl);
     14     switch (binding) {
     15         case kDesktop_GrGLBinding:
     16             SkASSERT(ver >= GR_GLSL_VER(1,10));
     17             if (ver >= GR_GLSL_VER(1,50)) {
     18                 return k150_GrGLSLGeneration;
     19             } else if (ver >= GR_GLSL_VER(1,40)) {
     20                 return k140_GrGLSLGeneration;
     21             } else if (ver >= GR_GLSL_VER(1,30)) {
     22                 return k130_GrGLSLGeneration;
     23             } else {
     24                 return k110_GrGLSLGeneration;
     25             }
     26         case kES_GrGLBinding:
     27             // version 1.00 of ES GLSL based on ver 1.20 of desktop GLSL
     28             SkASSERT(ver >= GR_GL_VER(1,00));
     29             return k110_GrGLSLGeneration;
     30         default:
     31             GrCrash("Unknown GL Binding");
     32             return k110_GrGLSLGeneration; // suppress warning
     33     }
     34 }
     35 
     36 const char* GrGetGLSLVersionDecl(const GrGLContextInfo& info) {
     37     switch (info.glslGeneration()) {
     38         case k110_GrGLSLGeneration:
     39             if (kES_GrGLBinding == info.binding()) {
     40                 // ES2s shader language is based on version 1.20 but is version
     41                 // 1.00 of the ES language.
     42                 return "#version 100\n";
     43             } else {
     44                 SkASSERT(kDesktop_GrGLBinding == info.binding());
     45                 return "#version 110\n";
     46             }
     47         case k130_GrGLSLGeneration:
     48             SkASSERT(kDesktop_GrGLBinding == info.binding());
     49             return "#version 130\n";
     50         case k140_GrGLSLGeneration:
     51             SkASSERT(kDesktop_GrGLBinding == info.binding());
     52             return "#version 140\n";
     53         case k150_GrGLSLGeneration:
     54             SkASSERT(kDesktop_GrGLBinding == info.binding());
     55             if (info.caps()->isCoreProfile()) {
     56                 return "#version 150\n";
     57             } else {
     58                 return "#version 150 compatibility\n";
     59             }
     60         default:
     61             GrCrash("Unknown GL version.");
     62             return ""; // suppress warning
     63     }
     64 }
     65 
     66 namespace {
     67     void append_tabs(SkString* outAppend, int tabCnt) {
     68         static const char kTabs[] = "\t\t\t\t\t\t\t\t";
     69         while (tabCnt) {
     70             int cnt = GrMin((int)GR_ARRAY_COUNT(kTabs), tabCnt);
     71             outAppend->append(kTabs, cnt);
     72             tabCnt -= cnt;
     73         }
     74     }
     75 }
     76 
     77 void GrGLSLMulVarBy4f(SkString* outAppend,
     78                       unsigned tabCnt,
     79                       const char* vec4VarName,
     80                       const GrGLSLExpr4& mulFactor) {
     81     if (mulFactor.isOnes()) {
     82         *outAppend = SkString();
     83     }
     84 
     85     append_tabs(outAppend, tabCnt);
     86 
     87     if (mulFactor.isZeros()) {
     88         outAppend->appendf("%s = vec4(0);\n", vec4VarName);
     89     } else {
     90         outAppend->appendf("%s *= %s;\n", vec4VarName, mulFactor.c_str());
     91     }
     92 }
     93