Revert of Turned on SkSL->GLSL compiler

src/gpu/gl/GrGLGpu.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLGpu.h"
 #include "GrGLBuffer.h"
 #include "GrGLGLSL.h"
@@ skipping 3772 matching lines @@
         fshaderTxt.appendf("#extension %s : require\n",
                            glslCaps->externalTextureExtensionString());
     }
     GrGLSLAppendDefaultFloatPrecisionDeclaration(kDefault_GrSLPrecision, *glslCaps,
                                                  &fshaderTxt);
     vTexCoord.setTypeModifier(GrShaderVar::kVaryingIn_TypeModifier);
     vTexCoord.appendDecl(glslCaps, &fshaderTxt);
     fshaderTxt.append(";");
     uTexture.appendDecl(glslCaps, &fshaderTxt);
     fshaderTxt.append(";");
+    const char* fsOutName;
+    if (glslCaps->mustDeclareFragmentShaderOutput()) {
+        oFragColor.appendDecl(glslCaps, &fshaderTxt);
+        fshaderTxt.append(";");
+        fsOutName = oFragColor.c_str();
+    } else {
+        fsOutName = "gl_FragColor";
+    }
     fshaderTxt.appendf(
         "// Copy Program FS\n"
         "void main() {"
-        "  sk_FragColor = %s(u_texture, v_texCoord);"
+        "  %s = %s(u_texture, v_texCoord);"
         "}",
+        fsOutName,
         GrGLSLTexture2DFunctionName(kVec2f_GrSLType, kSamplerTypes[progIdx], this->glslGeneration())
     );
 
     const char* str;
     GrGLint length;
 
     str = vshaderTxt.c_str();
     length = SkToInt(vshaderTxt.size());
     GrGLuint vshader = GrGLCompileAndAttachShader(*fGLContext, fCopyPrograms[progIdx].fProgram,
                                                   GR_GL_VERTEX_SHADER, &str, &length, 1,
@@ skipping 112 matching lines @@
     }
     GrGLSLAppendDefaultFloatPrecisionDeclaration(kDefault_GrSLPrecision, *glslCaps,
                                                  &fshaderTxt);
     for (int i = 0; i < numTaps; ++i) {
         vTexCoords[i].setTypeModifier(GrShaderVar::kVaryingIn_TypeModifier);
         vTexCoords[i].appendDecl(glslCaps, &fshaderTxt);
         fshaderTxt.append(";");
     }
     uTexture.appendDecl(glslCaps, &fshaderTxt);
     fshaderTxt.append(";");
+    const char* fsOutName;
+    if (glslCaps->mustDeclareFragmentShaderOutput()) {
+        oFragColor.appendDecl(glslCaps, &fshaderTxt);
+        fshaderTxt.append(";");
+        fsOutName = oFragColor.c_str();
+    } else {
+        fsOutName = "gl_FragColor";
+    }
     const char* sampleFunction = GrGLSLTexture2DFunctionName(kVec2f_GrSLType,
                                                              kTexture2DSampler_GrSLType,
                                                              this->glslGeneration());
     fshaderTxt.append(
         "// Mipmap Program FS\n"
         "void main() {"
     );
 
     if (oddWidth && oddHeight) {
         fshaderTxt.appendf(
-            "  sk_FragColor = (%s(u_texture, v_texCoord0) + %s(u_texture, v_texCoord1) + "
-            "                  %s(u_texture, v_texCoord2) + %s(u_texture, v_texCoord3)) * 0.25;",
-            sampleFunction, sampleFunction, sampleFunction, sampleFunction
+            "  %s = (%s(u_texture, v_texCoord0) + %s(u_texture, v_texCoord1) + "
+            "        %s(u_texture, v_texCoord2) + %s(u_texture, v_texCoord3)) * 0.25;",
+            fsOutName, sampleFunction, sampleFunction, sampleFunction, sampleFunction
         );
     } else if (oddWidth || oddHeight) {
         fshaderTxt.appendf(
-            "  sk_FragColor = (%s(u_texture, v_texCoord0) + %s(u_texture, v_texCoord1)) * 0.5;",
-            sampleFunction, sampleFunction
+            "  %s = (%s(u_texture, v_texCoord0) + %s(u_texture, v_texCoord1)) * 0.5;",
+            fsOutName, sampleFunction, sampleFunction
         );
     } else {
         fshaderTxt.appendf(
-            "  sk_FragColor = %s(u_texture, v_texCoord0);",
-            sampleFunction
+            "  %s = %s(u_texture, v_texCoord0);",
+            fsOutName, sampleFunction
         );
     }
 
     fshaderTxt.append("}");
 
     const char* str;
     GrGLint length;
 
     str = vshaderTxt.c_str();
     length = SkToInt(vshaderTxt.size());
@@ skipping 66 matching lines @@
     );
 
     GrGLSLShaderVar oFragColor("o_FragColor", kVec4f_GrSLType, GrShaderVar::kOut_TypeModifier);
 
     SkString fshaderTxt(version);
     GrGLSLAppendDefaultFloatPrecisionDeclaration(kDefault_GrSLPrecision,
                                                  *this->glCaps().glslCaps(),
                                                  &fshaderTxt);
     uColor.appendDecl(this->glCaps().glslCaps(), &fshaderTxt);
     fshaderTxt.append(";");
+    const char* fsOutName;
+    if (this->glCaps().glslCaps()->mustDeclareFragmentShaderOutput()) {
+        oFragColor.appendDecl(this->glCaps().glslCaps(), &fshaderTxt);
+        fshaderTxt.append(";");
+        fsOutName = oFragColor.c_str();
+    } else {
+        fsOutName = "gl_FragColor";
+    }
     fshaderTxt.appendf(
         "// Write Rect Program FS\n"
         "void main() {"
-        "  sk_FragColor = %s;"
+        "  %s = %s;"
         "}",
+        fsOutName,
         uColor.c_str()
     );
 
     const char* str;
     GrGLint length;
 
     str = vshaderTxt.c_str();
     length = SkToInt(vshaderTxt.size());
     GrGLuint vshader = GrGLCompileAndAttachShader(*fGLContext, fWireRectProgram.fProgram,
                                                   GR_GL_VERTEX_SHADER, &str, &length, 1,
@@ skipping 623 matching lines @@
 
 bool GrGLGpu::waitFence(GrFence fence, uint64_t timeout) const {
     GrGLenum result;
     GL_CALL_RET(result, ClientWaitSync((GrGLsync)fence, GR_GL_SYNC_FLUSH_COMMANDS_BIT, timeout));
     return (GR_GL_CONDITION_SATISFIED == result);
 }
 
 void GrGLGpu::deleteFence(GrFence fence) const {
     GL_CALL(DeleteSync((GrGLsync)fence));
 }