Fix for texture domain on imagination gpus

src/gpu/effects/GrTextureDomain.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrTextureDomain.h"
 #include "GrSimpleTextureEffect.h"
 #include "GrTBackendEffectFactory.h"
@@ skipping 78 matching lines @@
                 // call) causes the compilation error "Calls to any function that
                 // may require a gradient calculation inside a conditional block
                 // may return undefined results". This appears to be an issue with
                 // the 'any' call since even the simple "result=black; if (any())
                 // result=white;" code fails to compile.
                 builder->fsCodeAppend("\tvec4 outside = vec4(0.0, 0.0, 0.0, 0.0);\n");
                 builder->fsCodeAppend("\tvec4 inside = ");
                 builder->fsAppendTextureLookupAndModulate(inModulateColor, sampler,
                                                           inCoords.c_str());
                 builder->fsCodeAppend(";\n");
+                builder->fsCodeAppendf("\tfloat x = (%s).x;\n", inCoords.c_str());
+                builder->fsCodeAppendf("\tfloat y = (%s).y;\n", inCoords.c_str());
 
-                builder->fsCodeAppendf("\tfloat x = abs(2.0*(%s.x - %s.x)/(%s.z - %s.x) - 1.0);\n",
-                                        inCoords.c_str(), domain, domain, domain);
-                builder->fsCodeAppendf("\tfloat y = abs(2.0*(%s.y - %s.y)/(%s.w - %s.y) - 1.0);\n",
-                                        inCoords.c_str(), domain, domain, domain);
+                builder->fsCodeAppendf("\tx = abs(2.0*(x - %s.x)/(%s.z - %s.x) - 1.0);\n",
+                                       domain, domain, domain);
+                builder->fsCodeAppendf("\ty = abs(2.0*(y - %s.y)/(%s.w - %s.y) - 1.0);\n",
+                                       domain, domain, domain);
                 builder->fsCodeAppend("\tfloat blend = step(1.0, max(x, y));\n");
                 builder->fsCodeAppendf("\t%s = mix(inside, outside, blend);\n", outColor);
             } else {
                 builder->fsCodeAppend("\tbvec4 outside;\n");
                 builder->fsCodeAppendf("\toutside.xy = lessThan(%s, %s.xy);\n", inCoords.c_str(),
                                        domain);
                 builder->fsCodeAppendf("\toutside.zw = greaterThan(%s, %s.zw);\n", inCoords.c_str(),
                                        domain);
                 builder->fsCodeAppendf("\t%s = any(outside) ? vec4(0.0, 0.0, 0.0, 0.0) : ",
                                        outColor);
@@ skipping 178 matching lines @@
     const SkMatrix& matrix = GrEffectUnitTest::TestMatrix(random);
     bool bilerp = mode != GrTextureDomain::kRepeat_Mode ? random->nextBool() : false;
     GrCoordSet coords = random->nextBool() ? kLocal_GrCoordSet : kPosition_GrCoordSet;
     return GrTextureDomainEffect::Create(textures[texIdx],
                                          matrix,
                                          domain,
                                          mode,
                                          bilerp ? GrTextureParams::kBilerp_FilterMode : GrTextureParams::kNone_FilterMode,
                                          coords);
 }