Fix Ganesh perspective projection bug

src/gpu/gl/builders/GrGLVertexShaderBuilder.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLVertexShaderBuilder.h"
 #include "GrGLProgramBuilder.h"
 #include "../GrGLGLSL.h"
@@ skipping 40 matching lines @@
                                         &fRtAdjustName);
     if (this->getProgramBuilder()->desc().header().fSnapVerticesToPixelCenters) {
         if (kVec3f_GrSLType == posVar.getType()) {
             const char* p = posVar.c_str();
             this->codeAppendf("{vec2 _posTmp = vec2(%s.x/%s.z, %s.y/%s.z);", p, p, p, p);
         } else {
             SkASSERT(kVec2f_GrSLType == posVar.getType());
             this->codeAppendf("{vec2 _posTmp = %s;", posVar.c_str());
         }
         this->codeAppendf("_posTmp = floor(_posTmp) + vec2(0.5, 0.5);"
-                          "gl_Position = vec4(_posTmp.x * %s.x + %s.y, _posTmp.y * %s.z + %s.w, 0, 1);}",
+                          "gl_Position = vec4(_posTmp.x * %s.x + %s.y,"
+                                             "_posTmp.y * %s.z + %s.w, 0, 1);}",
                           fRtAdjustName, fRtAdjustName, fRtAdjustName, fRtAdjustName);
     } else if (kVec3f_GrSLType == posVar.getType()) {
-        this->codeAppendf("gl_Position = vec4(dot(%s.xz, %s.xy)/%s.z, dot(%s.yz, %s.zw)/%s.z, 0, 1);",
-                          posVar.c_str(), fRtAdjustName, posVar.c_str(),
-                          posVar.c_str(), fRtAdjustName, posVar.c_str());
+        this->codeAppendf("gl_Position = vec4(dot(%s.xz, %s.xy), dot(%s.yz, %s.zw), 0, %s.z);",
+                          posVar.c_str(), fRtAdjustName,
+                          posVar.c_str(), fRtAdjustName,
+                          posVar.c_str());
     } else {
         SkASSERT(kVec2f_GrSLType == posVar.getType());
         this->codeAppendf("gl_Position = vec4(%s.x * %s.x + %s.y, %s.y * %s.z + %s.w, 0, 1);",
                           posVar.c_str(), fRtAdjustName, fRtAdjustName,
                           posVar.c_str(), fRtAdjustName, fRtAdjustName);
     }
     // We could have the GrGeometryProcessor do this, but its just easier to have it performed
     // here. If we ever need to set variable pointsize, then we can reinvestigate
     this->codeAppend("gl_PointSize = 1.0;");
 }
@@ skipping 23 matching lines @@
     for (int i = 0; i < fInputs.count(); ++i) {
         const GrGLShaderVar& attr = fInputs[i];
         // if attribute already added, don't add it again
         if (attr.getName().equals(var.getName())) {
             return false;
         }
     }
     fInputs.push_back(var);
     return true;
 }