Revert "Switched highp float to highfloat and mediump float to half."

This reverts commit 88d99c63878c2d3d340120f0321676f72afcb4f0.

Reason for revert: Believed to be causing unit test failures in Chrome roll:

https://build.chromium.org/p/tryserver.chromium.android/builders/linux_android_rel_ng/builds/364433
https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Ftryserver.chromium.android%2Flinux_android_rel_ng%2F364433%2F%2B%2Frecipes%2Fsteps%2Fcontent_browsertests__with_patch__on_Android%2F0%2Flogs%2FWebRtcCaptureFromElementBrowserTest.VerifyCanvasWebGLCaptureColor%2F0

Original change's description:
> Switched highp float to highfloat and mediump float to half.
> 
> The ultimate goal is to end up with "float" and "half", but this
> intermediate step uses "highfloat" so that it is clear if I missed a
> "float" somewhere. Once this lands, a subsequent CL will switch all
> "highfloats" back to "floats".
> 
> Bug: skia:
> Change-Id: Ia13225c7a0a0a2901e07665891c473d2500ddcca
> Reviewed-on: https://skia-review.googlesource.com/31000
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

TBR=bsalomon@google.com,csmartdalton@google.com,ethannicholas@google.com

Change-Id: I8bfa97547ac3920d433665f161d27df3f15c83aa
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/35705
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>

1 files changed, 80 insertions, 76 deletions

diff --git a/src/gpu/effects/GrDistanceFieldGeoProc.cpp b/src/gpu/effects/GrDistanceFieldGeoProc.cpp
index d1d14c9292..8dd2fa617a 100644
--- a/src/gpu/effects/GrDistanceFieldGeoProc.cpp
+++ b/src/gpu/effects/GrDistanceFieldGeoProc.cpp
@@ -45,7 +45,8 @@ public:
         // adjust based on gamma
         const char* distanceAdjustUniName = nullptr;
         // width, height, 1/(3*width)
-        fDistanceAdjustUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf_GrSLType,
+        fDistanceAdjustUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
+                                                        kFloat_GrSLType, kDefault_GrSLPrecision,
                                                         "DistanceAdjust", &distanceAdjustUniName);
 #endif
 
@@ -69,8 +70,8 @@ public:
                              args.fFPCoordTransformHandler);
 
         // add varyings
-        GrGLSLVertToFrag recipScale(kHalf2_GrSLType);
-        GrGLSLVertToFrag uv(kHighFloat2_GrSLType);
+        GrGLSLVertToFrag recipScale(kFloat_GrSLType);
+        GrGLSLVertToFrag uv(kVec2f_GrSLType);
         bool isUniformScale = (dfTexEffect.getFlags() & kUniformScale_DistanceFieldEffectMask) ==
                               kUniformScale_DistanceFieldEffectMask;
         bool isSimilarity = SkToBool(dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag);
@@ -78,7 +79,7 @@ public:
             SkToBool(dfTexEffect.getFlags() & kGammaCorrect_DistanceFieldEffectFlag);
         bool isAliased =
             SkToBool(dfTexEffect.getFlags() & kAliased_DistanceFieldEffectFlag);
-        varyingHandler->addVarying("TextureCoords", &uv);
+        varyingHandler->addVarying("TextureCoords", &uv, kHigh_GrSLPrecision);
         vertBuilder->codeAppendf("%s = %s;", uv.vsOut(), dfTexEffect.inTextureCoords()->fName);
 
         // compute numbers to be hardcoded to convert texture coordinates from float to int
@@ -86,28 +87,28 @@ public:
         GrTexture* atlas = dfTexEffect.textureSampler(0).peekTexture();
         SkASSERT(atlas && SkIsPow2(atlas->width()) && SkIsPow2(atlas->height()));
 
-        GrGLSLVertToFrag st(kHighFloat2_GrSLType);
-        varyingHandler->addVarying("IntTextureCoords", &st);
-        vertBuilder->codeAppendf("%s = highfloat2(%d, %d) * %s;", st.vsOut(),
+        GrGLSLVertToFrag st(kVec2f_GrSLType);
+        varyingHandler->addVarying("IntTextureCoords", &st, kHigh_GrSLPrecision);
+        vertBuilder->codeAppendf("%s = float2(%d, %d) * %s;", st.vsOut(),
                                  atlas->width(), atlas->height(),
                                  dfTexEffect.inTextureCoords()->fName);
 
         // Use highp to work around aliasing issues
-        fragBuilder->codeAppendf("highfloat2 uv = %s;\n", uv.fsIn());
+        fragBuilder->codeAppendf("highp float2 uv = %s;\n", uv.fsIn());
 
-        fragBuilder->codeAppend("\thalf texColor = ");
+        fragBuilder->codeAppend("\tfloat texColor = ");
         fragBuilder->appendTextureLookup(args.fTexSamplers[0],
                                          "uv",
-                                         kHighFloat2_GrSLType);
+                                         kVec2f_GrSLType);
         fragBuilder->codeAppend(".r;\n");
-        fragBuilder->codeAppend("\thalf distance = "
+        fragBuilder->codeAppend("\tfloat distance = "
                        SK_DistanceFieldMultiplier "*(texColor - " SK_DistanceFieldThreshold ");");
 #ifdef SK_GAMMA_APPLY_TO_A8
         // adjust width based on gamma
         fragBuilder->codeAppendf("distance -= %s;", distanceAdjustUniName);
 #endif
 
-        fragBuilder->codeAppend("half afwidth;");
+        fragBuilder->codeAppend("float afwidth;");
         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.
@@ -130,29 +131,29 @@ public:
 
             // this gives us a smooth step across approximately one fragment
 #ifdef SK_VULKAN
-            fragBuilder->codeAppendf("half st_grad_len = length(dFdx(%s));", st.fsIn());
+            fragBuilder->codeAppendf("float st_grad_len = length(dFdx(%s));", st.fsIn());
 #else
             // We use the y gradient because there is a bug in the Mali 400 in the x direction.
-            fragBuilder->codeAppendf("half st_grad_len = length(dFdy(%s));", st.fsIn());
+            fragBuilder->codeAppendf("float st_grad_len = length(dFdy(%s));", st.fsIn());
 #endif
             fragBuilder->codeAppend("afwidth = abs(" SK_DistanceFieldAAFactor "*st_grad_len);");
         } else {
             // For general transforms, to determine the amount of correction we multiply a unit
             // vector pointing along the SDF gradient direction by the Jacobian of the st coords
             // (which is the inverse transform for this fragment) and take the length of the result.
-            fragBuilder->codeAppend("half2 dist_grad = half2(dFdx(distance), dFdy(distance));");
+            fragBuilder->codeAppend("float2 dist_grad = float2(dFdx(distance), dFdy(distance));");
             // the length of the gradient may be 0, so we need to check for this
             // this also compensates for the Adreno, which likes to drop tiles on division by 0
-            fragBuilder->codeAppend("half dg_len2 = dot(dist_grad, dist_grad);");
+            fragBuilder->codeAppend("float dg_len2 = dot(dist_grad, dist_grad);");
             fragBuilder->codeAppend("if (dg_len2 < 0.0001) {");
-            fragBuilder->codeAppend("dist_grad = half2(0.7071, 0.7071);");
+            fragBuilder->codeAppend("dist_grad = float2(0.7071, 0.7071);");
             fragBuilder->codeAppend("} else {");
             fragBuilder->codeAppend("dist_grad = dist_grad*inversesqrt(dg_len2);");
             fragBuilder->codeAppend("}");
 
-            fragBuilder->codeAppendf("half2 Jdx = dFdx(%s);", st.fsIn());
-            fragBuilder->codeAppendf("half2 Jdy = dFdy(%s);", st.fsIn());
-            fragBuilder->codeAppend("half2 grad = half2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,");
+            fragBuilder->codeAppendf("float2 Jdx = dFdx(%s);", st.fsIn());
+            fragBuilder->codeAppendf("float2 Jdy = dFdy(%s);", st.fsIn());
+            fragBuilder->codeAppend("float2 grad = float2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,");
             fragBuilder->codeAppend("                 dist_grad.x*Jdx.y + dist_grad.y*Jdy.y);");
 
             // this gives us a smooth step across approximately one fragment
@@ -160,18 +161,18 @@ public:
         }
 
         if (isAliased) {
-            fragBuilder->codeAppend("half val = distance > 0 ? 1.0 : 0.0;");
+            fragBuilder->codeAppend("float val = distance > 0 ? 1.0 : 0.0;");
         } else if (isGammaCorrect) {
             // The smoothstep falloff compensates for the non-linear sRGB response curve. If we are
             // doing gamma-correct rendering (to an sRGB or F16 buffer), then we actually want
             // distance mapped linearly to coverage, so use a linear step:
             fragBuilder->codeAppend(
-                "half val = clamp((distance + afwidth) / (2.0 * afwidth), 0.0, 1.0);");
+                "float val = clamp((distance + afwidth) / (2.0 * afwidth), 0.0, 1.0);");
         } else {
-            fragBuilder->codeAppend("half val = smoothstep(-afwidth, afwidth, distance);");
+            fragBuilder->codeAppend("float val = smoothstep(-afwidth, afwidth, distance);");
         }
 
-        fragBuilder->codeAppendf("%s = half4(val);", args.fOutputCoverage);
+        fragBuilder->codeAppendf("%s = float4(val);", args.fOutputCoverage);
     }
 
     void setData(const GrGLSLProgramDataManager& pdman, const GrPrimitiveProcessor& proc,
@@ -322,7 +323,7 @@ public:
         // emit attributes
         varyingHandler->emitAttributes(dfTexEffect);
 
-        GrGLSLVertToFrag v(kHighFloat2_GrSLType);
+        GrGLSLVertToFrag v(kVec2f_GrSLType);
         varyingHandler->addVarying("TextureCoords", &v, kHigh_GrSLPrecision);
 
         // setup pass through color
@@ -346,22 +347,23 @@ public:
                              args.fFPCoordTransformHandler);
 
         const char* textureSizeUniName = nullptr;
-        fTextureSizeUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf2_GrSLType,
+        fTextureSizeUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
+                                                     kVec2f_GrSLType, kDefault_GrSLPrecision,
                                                      "TextureSize", &textureSizeUniName);
 
         // Use highp to work around aliasing issues
-        fragBuilder->codeAppendf("highfloat2 uv = %s;", v.fsIn());
+        fragBuilder->codeAppendf("highp float2 uv = %s;", v.fsIn());
 
-        fragBuilder->codeAppend("half texColor = ");
+        fragBuilder->codeAppend("float texColor = ");
         fragBuilder->appendTextureLookup(args.fTexSamplers[0],
                                          "uv",
-                                         kHighFloat2_GrSLType);
+                                         kVec2f_GrSLType);
         fragBuilder->codeAppend(".r;");
-        fragBuilder->codeAppend("half distance = "
+        fragBuilder->codeAppend("float distance = "
             SK_DistanceFieldMultiplier "*(texColor - " SK_DistanceFieldThreshold ");");
 
-        fragBuilder->codeAppendf("highfloat2 st = uv*%s;", textureSizeUniName);
-        fragBuilder->codeAppend("half afwidth;");
+        fragBuilder->codeAppendf("highp float2 st = uv*%s;", textureSizeUniName);
+        fragBuilder->codeAppend("float afwidth;");
         bool isUniformScale = (dfTexEffect.getFlags() & kUniformScale_DistanceFieldEffectMask) ==
                                kUniformScale_DistanceFieldEffectMask;
         bool isSimilarity = SkToBool(dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag);
@@ -386,29 +388,29 @@ public:
 
             // this gives us a smooth step across approximately one fragment
 #ifdef SK_VULKAN
-            fragBuilder->codeAppend("half st_grad_len = length(dFdx(st));");
+            fragBuilder->codeAppend("float st_grad_len = length(dFdx(st));");
 #else
             // We use the y gradient because there is a bug in the Mali 400 in the x direction.
-            fragBuilder->codeAppend("half st_grad_len = length(dFdy(st));");
+            fragBuilder->codeAppend("float st_grad_len = length(dFdy(st));");
 #endif
             fragBuilder->codeAppend("afwidth = abs(" SK_DistanceFieldAAFactor "*st_grad_len);");
         } else {
             // For general transforms, to determine the amount of correction we multiply a unit
             // vector pointing along the SDF gradient direction by the Jacobian of the st coords
             // (which is the inverse transform for this fragment) and take the length of the result.
-            fragBuilder->codeAppend("half2 dist_grad = half2(dFdx(distance), dFdy(distance));");
+            fragBuilder->codeAppend("float2 dist_grad = float2(dFdx(distance), dFdy(distance));");
             // the length of the gradient may be 0, so we need to check for this
             // this also compensates for the Adreno, which likes to drop tiles on division by 0
-            fragBuilder->codeAppend("half dg_len2 = dot(dist_grad, dist_grad);");
+            fragBuilder->codeAppend("float dg_len2 = dot(dist_grad, dist_grad);");
             fragBuilder->codeAppend("if (dg_len2 < 0.0001) {");
-            fragBuilder->codeAppend("dist_grad = half2(0.7071, 0.7071);");
+            fragBuilder->codeAppend("dist_grad = float2(0.7071, 0.7071);");
             fragBuilder->codeAppend("} else {");
             fragBuilder->codeAppend("dist_grad = dist_grad*inversesqrt(dg_len2);");
             fragBuilder->codeAppend("}");
 
-            fragBuilder->codeAppend("half2 Jdx = dFdx(st);");
-            fragBuilder->codeAppend("half2 Jdy = dFdy(st);");
-            fragBuilder->codeAppend("half2 grad = half2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,");
+            fragBuilder->codeAppend("float2 Jdx = dFdx(st);");
+            fragBuilder->codeAppend("float2 Jdy = dFdy(st);");
+            fragBuilder->codeAppend("float2 grad = float2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,");
             fragBuilder->codeAppend("                 dist_grad.x*Jdx.y + dist_grad.y*Jdy.y);");
 
             // this gives us a smooth step across approximately one fragment
@@ -419,12 +421,12 @@ public:
         // mapped linearly to coverage, so use a linear step:
         if (isGammaCorrect) {
             fragBuilder->codeAppend(
-                "half val = clamp((distance + afwidth) / (2.0 * afwidth), 0.0, 1.0);");
+                "float val = clamp((distance + afwidth) / (2.0 * afwidth), 0.0, 1.0);");
         } else {
-            fragBuilder->codeAppend("half val = smoothstep(-afwidth, afwidth, distance);");
+            fragBuilder->codeAppend("float val = smoothstep(-afwidth, afwidth, distance);");
         }
 
-        fragBuilder->codeAppendf("%s = half4(val);", args.fOutputCoverage);
+        fragBuilder->codeAppendf("%s = float4(val);", args.fOutputCoverage);
     }
 
     void setData(const GrGLSLProgramDataManager& pdman, const GrPrimitiveProcessor& proc,
@@ -587,7 +589,8 @@ public:
         bool isSimilarity = SkToBool(dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag);
         bool isGammaCorrect =
             SkToBool(dfTexEffect.getFlags() & kGammaCorrect_DistanceFieldEffectFlag);
-        GrGLSLVertToFrag uv(kHighFloat2_GrSLType);
+        GrGLSLVertToFrag recipScale(kFloat_GrSLType);
+        GrGLSLVertToFrag uv(kVec2f_GrSLType);
         varyingHandler->addVarying("TextureCoords", &uv, kHigh_GrSLPrecision);
         vertBuilder->codeAppendf("%s = %s;", uv.vsOut(), dfTexEffect.inTextureCoords()->fName);
 
@@ -596,9 +599,9 @@ public:
         GrTexture* atlas = dfTexEffect.textureSampler(0).peekTexture();
         SkASSERT(atlas && SkIsPow2(atlas->width()) && SkIsPow2(atlas->height()));
 
-        GrGLSLVertToFrag st(kHighFloat2_GrSLType);
+        GrGLSLVertToFrag st(kVec2f_GrSLType);
         varyingHandler->addVarying("IntTextureCoords", &st, kHigh_GrSLPrecision);
-        vertBuilder->codeAppendf("%s = highfloat2(%d, %d) * %s;", st.vsOut(),
+        vertBuilder->codeAppendf("%s = float2(%d, %d) * %s;", st.vsOut(),
                                  atlas->width(), atlas->height(),
                                  dfTexEffect.inTextureCoords()->fName);
 
@@ -606,68 +609,69 @@ public:
 
         // create LCD offset adjusted by inverse of transform
         // Use highp to work around aliasing issues
-        fragBuilder->codeAppendf("highfloat2 uv = %s;\n", uv.fsIn());
+        fragBuilder->codeAppendf("highp float2 uv = %s;\n", uv.fsIn());
 
         SkScalar lcdDelta = 1.0f / (3.0f * atlas->width());
         if (dfTexEffect.getFlags() & kBGR_DistanceFieldEffectFlag) {
-            fragBuilder->codeAppendf("highfloat delta = -%.*f;\n", SK_FLT_DECIMAL_DIG, lcdDelta);
+            fragBuilder->codeAppendf("highp float delta = -%.*f;\n", SK_FLT_DECIMAL_DIG, lcdDelta);
         } else {
-            fragBuilder->codeAppendf("highfloat delta = %.*f;\n", SK_FLT_DECIMAL_DIG, lcdDelta);
+            fragBuilder->codeAppendf("highp float delta = %.*f;\n", SK_FLT_DECIMAL_DIG, lcdDelta);
         }
         if (isUniformScale) {
 #ifdef SK_VULKAN
-            fragBuilder->codeAppendf("half st_grad_len = abs(dFdx(%s.x));", st.fsIn());
+            fragBuilder->codeAppendf("float st_grad_len = abs(dFdx(%s.x));", st.fsIn());
 #else
             // We use the y gradient because there is a bug in the Mali 400 in the x direction.
-            fragBuilder->codeAppendf("half st_grad_len = abs(dFdy(%s.y));", st.fsIn());
+            fragBuilder->codeAppendf("float st_grad_len = abs(dFdy(%s.y));", st.fsIn());
 #endif
-            fragBuilder->codeAppend("half2 offset = half2(st_grad_len*delta, 0.0);");
+            fragBuilder->codeAppend("float2 offset = float2(st_grad_len*delta, 0.0);");
         } else if (isSimilarity) {
             // For a similarity matrix with rotation, the gradient will not be aligned
             // with the texel coordinate axes, so we need to calculate it.
 #ifdef SK_VULKAN
-            fragBuilder->codeAppendf("half2 st_grad = dFdx(%s);", st.fsIn());
-            fragBuilder->codeAppend("half2 offset = delta*st_grad;");
+            fragBuilder->codeAppendf("float2 st_grad = dFdx(%s);", st.fsIn());
+            fragBuilder->codeAppend("float2 offset = delta*st_grad;");
 #else
             // We use dFdy because of a Mali 400 bug, and rotate -90 degrees to
             // get the gradient in the x direction.
-            fragBuilder->codeAppendf("half2 st_grad = dFdy(%s);", st.fsIn());
-            fragBuilder->codeAppend("half2 offset = delta*half2(st_grad.y, -st_grad.x);");
+            fragBuilder->codeAppendf("float2 st_grad = dFdy(%s);", st.fsIn());
+            fragBuilder->codeAppend("float2 offset = delta*float2(st_grad.y, -st_grad.x);");
 #endif
-            fragBuilder->codeAppend("half st_grad_len = length(st_grad);");
+            fragBuilder->codeAppend("float st_grad_len = length(st_grad);");
         } else {
-            fragBuilder->codeAppendf("half2 st = %s;\n", st.fsIn());
+            fragBuilder->codeAppendf("float2 st = %s;\n", st.fsIn());
 
-            fragBuilder->codeAppend("half2 Jdx = dFdx(st);");
-            fragBuilder->codeAppend("half2 Jdy = dFdy(st);");
-            fragBuilder->codeAppend("half2 offset = delta*Jdx;");
+            fragBuilder->codeAppend("float2 Jdx = dFdx(st);");
+            fragBuilder->codeAppend("float2 Jdy = dFdy(st);");
+            fragBuilder->codeAppend("float2 offset = delta*Jdx;");
         }
 
         // green is distance to uv center
-        fragBuilder->codeAppend("\thalf4 texColor = ");
-        fragBuilder->appendTextureLookup(args.fTexSamplers[0], "uv", kHighFloat2_GrSLType);
+        fragBuilder->codeAppend("\tfloat4 texColor = ");
+        fragBuilder->appendTextureLookup(args.fTexSamplers[0], "uv", kVec2f_GrSLType);
         fragBuilder->codeAppend(";\n");
-        fragBuilder->codeAppend("\thalf3 distance;\n");
+        fragBuilder->codeAppend("\tfloat3 distance;\n");
         fragBuilder->codeAppend("\tdistance.y = texColor.r;\n");
         // red is distance to left offset
-        fragBuilder->codeAppend("\thighfloat2 uv_adjusted = uv - offset;\n");
+        fragBuilder->codeAppend("\tfloat2 uv_adjusted = uv - offset;\n");
         fragBuilder->codeAppend("\ttexColor = ");
-        fragBuilder->appendTextureLookup(args.fTexSamplers[0], "uv_adjusted", kHighFloat2_GrSLType);
+        fragBuilder->appendTextureLookup(args.fTexSamplers[0], "uv_adjusted", kVec2f_GrSLType);
         fragBuilder->codeAppend(";\n");
         fragBuilder->codeAppend("\tdistance.x = texColor.r;\n");
         // blue is distance to right offset
         fragBuilder->codeAppend("\tuv_adjusted = uv + offset;\n");
         fragBuilder->codeAppend("\ttexColor = ");
-        fragBuilder->appendTextureLookup(args.fTexSamplers[0], "uv_adjusted", kHighFloat2_GrSLType);
+        fragBuilder->appendTextureLookup(args.fTexSamplers[0], "uv_adjusted", kVec2f_GrSLType);
         fragBuilder->codeAppend(";\n");
         fragBuilder->codeAppend("\tdistance.z = texColor.r;\n");
 
         fragBuilder->codeAppend("\tdistance = "
-           "half3(" SK_DistanceFieldMultiplier ")*(distance - half3(" SK_DistanceFieldThreshold"));");
+           "float3(" SK_DistanceFieldMultiplier ")*(distance - float3(" SK_DistanceFieldThreshold"));");
 
         // adjust width based on gamma
         const char* distanceAdjustUniName = nullptr;
-        fDistanceAdjustUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf3_GrSLType,
+        fDistanceAdjustUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
+                                                        kVec3f_GrSLType, kDefault_GrSLPrecision,
                                                         "DistanceAdjust", &distanceAdjustUniName);
         fragBuilder->codeAppendf("distance -= %s;", distanceAdjustUniName);
 
@@ -675,7 +679,7 @@ public:
         // for each color component. However, this is only important when using perspective
         // transformations, and even then using a single factor seems like a reasonable
         // trade-off between quality and speed.
-        fragBuilder->codeAppend("half afwidth;");
+        fragBuilder->codeAppend("float afwidth;");
         if (isSimilarity) {
             // For similarity transform (uniform scale-only is a subset of this), we adjust for the
             // effect of the transformation on the distance by using the length of the gradient of
@@ -688,16 +692,16 @@ public:
             // For general transforms, to determine the amount of correction we multiply a unit
             // vector pointing along the SDF gradient direction by the Jacobian of the st coords
             // (which is the inverse transform for this fragment) and take the length of the result.
-            fragBuilder->codeAppend("half2 dist_grad = half2(dFdx(distance.r), dFdy(distance.r));");
+            fragBuilder->codeAppend("float2 dist_grad = float2(dFdx(distance.r), dFdy(distance.r));");
             // the length of the gradient may be 0, so we need to check for this
             // this also compensates for the Adreno, which likes to drop tiles on division by 0
-            fragBuilder->codeAppend("half dg_len2 = dot(dist_grad, dist_grad);");
+            fragBuilder->codeAppend("float dg_len2 = dot(dist_grad, dist_grad);");
             fragBuilder->codeAppend("if (dg_len2 < 0.0001) {");
-            fragBuilder->codeAppend("dist_grad = half2(0.7071, 0.7071);");
+            fragBuilder->codeAppend("dist_grad = float2(0.7071, 0.7071);");
             fragBuilder->codeAppend("} else {");
             fragBuilder->codeAppend("dist_grad = dist_grad*inversesqrt(dg_len2);");
             fragBuilder->codeAppend("}");
-            fragBuilder->codeAppend("half2 grad = half2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,");
+            fragBuilder->codeAppend("float2 grad = float2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,");
             fragBuilder->codeAppend("                 dist_grad.x*Jdx.y + dist_grad.y*Jdy.y);");
 
             // this gives us a smooth step across approximately one fragment
@@ -709,11 +713,11 @@ public:
         // mapped linearly to coverage, so use a linear step:
         if (isGammaCorrect) {
             fragBuilder->codeAppendf("%s = "
-                "half4(clamp((distance + half3(afwidth)) / half3(2.0 * afwidth), 0.0, 1.0), 1.0);",
+                "float4(clamp((distance + float3(afwidth)) / float3(2.0 * afwidth), 0.0, 1.0), 1.0);",
                 args.fOutputCoverage);
         } else {
             fragBuilder->codeAppendf(
-                "%s = half4(smoothstep(half3(-afwidth), half3(afwidth), distance), 1.0);",
+                "%s = float4(smoothstep(float3(-afwidth), float3(afwidth), distance), 1.0);",
                 args.fOutputCoverage);
         }
     }