Make GrGLShaderBuilder responsible for inserting begining of main() function defition and closing brace.

This will allow another change I am working on to insert code at the begining of a shader.

R=robertphillips@google.com
Review URL: https://codereview.appspot.com/6737058

git-svn-id: http://skia.googlecode.com/svn/trunk@6028 2bbb7eff-a529-9590-31e7-b0007b416f81

src/gpu/gl/GrGLProgram.cpp

@@ -364,9 +364,8 @@ void GrGLProgram::genGeometryShader(GrGLShaderBuilder* segments) const {
         GrAssert(fContextInfo.glslGeneration() >= k150_GrGLSLGeneration);
         segments->fGSHeader.append("layout(triangles) in;\n"
                                    "layout(triangle_strip, max_vertices = 6) out;\n");
-        segments->fGSCode.append("void main() {\n"
+        segments->fGSCode.append("\tfor (int i = 0; i < 3; ++i) {\n"
-                                 "\tfor (int i = 0; i < 3; ++i) {\n"
+                                 "\t\tgl_Position = gl_in[i].gl_Position;\n");
-                                  "\t\tgl_Position = gl_in[i].gl_Position;\n");
         if (fDesc.fEmitsPointSize) {
             segments->fGSCode.append("\t\tgl_PointSize = 1.0;\n");
         }
@@ -379,8 +378,7 @@ void GrGLProgram::genGeometryShader(GrGLShaderBuilder* segments) const {
         }
         segments->fGSCode.append("\t\tEmitVertex();\n"
                                  "\t}\n"
-                                 "\tEndPrimitive();\n"
+                                 "\tEndPrimitive();\n");
-                                 "}\n");
     }
 #endif
 }
@@ -571,9 +569,8 @@ bool GrGLProgram::genProgram(const GrCustomStage** customStages) {
                                      GrGLShaderVar::kAttribute_TypeModifier,
                                      POS_ATTR_NAME);
 
-    builder.fVSCode.appendf("void main() {\n"
+    builder.fVSCode.appendf("\tvec3 pos3 = %s * vec3("POS_ATTR_NAME", 1);\n"
-                              "\tvec3 pos3 = %s * vec3("POS_ATTR_NAME", 1);\n"
+                            "\tgl_Position = vec4(pos3.xy, 0, pos3.z);\n",
-                              "\tgl_Position = vec4(pos3.xy, 0, pos3.z);\n",
                             viewMName);
 
     // incoming color to current stage being processed.
@@ -588,8 +585,6 @@ bool GrGLProgram::genProgram(const GrCustomStage** customStages) {
         builder.fVSCode.append("\tgl_PointSize = 1.0;\n");
     }
 
-    builder.fFSCode.append("void main() {\n");
-
     // add texture coordinates that are used to the list of vertex attr decls
     SkString texCoordAttrs[GrDrawState::kMaxTexCoords];
     for (int t = 0; t < GrDrawState::kMaxTexCoords; ++t) {
@@ -791,9 +786,6 @@ bool GrGLProgram::genProgram(const GrCustomStage** customStages) {
         }
     }
 
-    builder.fVSCode.append("}\n");
-    builder.fFSCode.append("}\n");
-
     ///////////////////////////////////////////////////////////////////////////
     // insert GS
 #if GR_DEBUG

src/gpu/gl/GrGLShaderBuilder.cpp

@@ -359,7 +359,9 @@ void GrGLShaderBuilder::getShader(ShaderType type, SkString* shaderStr) const {
             this->appendUniformDecls(kVertex_ShaderType, shaderStr);
             this->appendDecls(fVSAttrs, shaderStr);
             this->appendDecls(fVSOutputs, shaderStr);
+            shaderStr->append("void main() {\n");
             shaderStr->append(fVSCode);
+            shaderStr->append("}\n");
             break;
         case kGeometry_ShaderType:
             if (fUsesGS) {
@@ -367,7 +369,9 @@ void GrGLShaderBuilder::getShader(ShaderType type, SkString* shaderStr) const {
                 shaderStr->append(fGSHeader);
                 this->appendDecls(fGSInputs, shaderStr);
                 this->appendDecls(fGSOutputs, shaderStr);
+                shaderStr->append("void main() {\n");
                 shaderStr->append(fGSCode);
+                shaderStr->append("}\n");
             } else {
                 shaderStr->reset();
             }
@@ -383,7 +387,9 @@ void GrGLShaderBuilder::getShader(ShaderType type, SkString* shaderStr) const {
             GrAssert(k110_GrGLSLGeneration != fContext.glslGeneration() || fFSOutputs.empty());
             this->appendDecls(fFSOutputs, shaderStr);
             shaderStr->append(fFSFunctions);
+            shaderStr->append("void main() {\n");
             shaderStr->append(fFSCode);
+            shaderStr->append("}\n");
             break;
     }
  }