Add appendPrecisionModifier method to GrGLSLShaderBuilder

src/gpu/effects/GrDistanceFieldGeoProc.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDistanceFieldGeoProc.h"
 #include "GrInvariantOutput.h"
 #include "GrTexture.h"
@@ skipping 79 matching lines @@
         GrTexture* atlas = dfTexEffect.textureAccess(0).getTexture();
         SkASSERT(atlas && SkIsPow2(atlas->width()) && SkIsPow2(atlas->height()));
 
         GrGLSLVertToFrag st(kVec2f_GrSLType);
         varyingHandler->addVarying("IntTextureCoords", &st, kHigh_GrSLPrecision);
         vertBuilder->codeAppendf("%s = vec2(%d, %d) * %s;", st.vsOut(),
                                  atlas->width(), atlas->height(),
                                  dfTexEffect.inTextureCoords()->fName);
 
         // Use highp to work around aliasing issues
-        fragBuilder->codeAppend(GrGLSLShaderVar::PrecisionString(args.fGLSLCaps,
-                                                                 kHigh_GrSLPrecision));
+        fragBuilder->appendPrecisionModifier(kHigh_GrSLPrecision);
         fragBuilder->codeAppendf("vec2 uv = %s;\n", uv.fsIn());
 
         fragBuilder->codeAppend("\tfloat texColor = ");
         fragBuilder->appendTextureLookup(args.fSamplers[0],
                                          "uv",
                                          kVec2f_GrSLType);
         fragBuilder->codeAppend(".r;\n");
         fragBuilder->codeAppend("\tfloat distance = "
                        SK_DistanceFieldMultiplier "*(texColor - " SK_DistanceFieldThreshold ");");
 #ifdef SK_GAMMA_APPLY_TO_A8
@@ skipping 216 matching lines @@
                              dfTexEffect.inPosition()->fName,
                              args.fTransformsIn,
                              args.fTransformsOut);
 
         const char* textureSizeUniName = nullptr;
         fTextureSizeUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
                                                      kVec2f_GrSLType, kDefault_GrSLPrecision,
                                                      "TextureSize", &textureSizeUniName);
 
         // Use highp to work around aliasing issues
-        fragBuilder->codeAppend(GrGLSLShaderVar::PrecisionString(args.fGLSLCaps,
-                                                                 kHigh_GrSLPrecision));
+        fragBuilder->appendPrecisionModifier(kHigh_GrSLPrecision);
         fragBuilder->codeAppendf("vec2 uv = %s;", v.fsIn());
 
         fragBuilder->codeAppend("float texColor = ");
         fragBuilder->appendTextureLookup(args.fSamplers[0],
                                          "uv",
                                          kVec2f_GrSLType);
         fragBuilder->codeAppend(".r;");
         fragBuilder->codeAppend("float distance = "
             SK_DistanceFieldMultiplier "*(texColor - " SK_DistanceFieldThreshold ");");
 
-        fragBuilder->codeAppend(GrGLSLShaderVar::PrecisionString(args.fGLSLCaps,
-                                                                 kHigh_GrSLPrecision));
+        fragBuilder->appendPrecisionModifier(kHigh_GrSLPrecision);
         fragBuilder->codeAppendf("vec2 st = uv*%s;", textureSizeUniName);
         fragBuilder->codeAppend("float afwidth;");
         bool isUniformScale = (dfTexEffect.getFlags() & kUniformScale_DistanceFieldEffectMask) ==
                                kUniformScale_DistanceFieldEffectMask;
         bool isSimilarity = SkToBool(dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag);
         if (isUniformScale) {
             // For uniform scale, we adjust for the effect of the transformation on the distance
             // by using the length of the gradient of the t coordinate in the y direction.
             // We use st coordinates to ensure we're mapping 1:1 from texel space to pixel space.
             // We use the y gradient because there is a bug in the Mali 400 in the x direction.
@@ skipping 210 matching lines @@
                                  atlas->width(), atlas->height(),
                                  dfTexEffect.inTextureCoords()->fName);
 
         // add frag shader code
 
         SkAssertResult(fragBuilder->enableFeature(
                 GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
 
         // create LCD offset adjusted by inverse of transform
         // Use highp to work around aliasing issues
-        fragBuilder->codeAppend(GrGLSLShaderVar::PrecisionString(args.fGLSLCaps,
-                                                                 kHigh_GrSLPrecision));
+        fragBuilder->appendPrecisionModifier(kHigh_GrSLPrecision);
         fragBuilder->codeAppendf("vec2 uv = %s;\n", uv.fsIn());
-        fragBuilder->codeAppend(GrGLSLShaderVar::PrecisionString(args.fGLSLCaps,
-                                                                 kHigh_GrSLPrecision));
+        fragBuilder->appendPrecisionModifier(kHigh_GrSLPrecision);
 
         SkScalar lcdDelta = 1.0f / (3.0f * atlas->width());
         if (dfTexEffect.getFlags() & kBGR_DistanceFieldEffectFlag) {
             fragBuilder->codeAppendf("float delta = -%.*f;\n", SK_FLT_DECIMAL_DIG, lcdDelta);
         } else {
             fragBuilder->codeAppendf("float delta = %.*f;\n", SK_FLT_DECIMAL_DIG, lcdDelta);
         }
         if (isUniformScale) {
             fragBuilder->codeAppendf("float st_grad_len = abs(dFdy(%s.y));", st.fsIn());
             fragBuilder->codeAppend("vec2 offset = vec2(st_grad_len*delta, 0.0);");
@@ skipping 191 matching lines @@
         flags |= d->fRandom->nextBool() ? kScaleOnly_DistanceFieldEffectFlag : 0;
     }
     flags |= d->fRandom->nextBool() ? kBGR_DistanceFieldEffectFlag : 0;
     return GrDistanceFieldLCDTextGeoProc::Create(GrRandomColor(d->fRandom),
                                                  GrTest::TestMatrix(d->fRandom),
                                                  d->fTextures[texIdx], params,
                                                  wa,
                                                  flags,
                                                  d->fRandom->nextBool());
 }