disable floating point textures if GLSL version is < 330

src/gpu/gl/GrGLCaps.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 "GrGLCaps.h"
 
@@ skipping 524 matching lines @@
                 fConfigRenderSupport[kSRGBA_8888_GrPixelConfig][kYes_MSAA] = true;
             }
         }
     }
     
     if (this->isConfigTexturable(kRGBA_float_GrPixelConfig)) {
         if (kGL_GrGLStandard == standard) {
             fConfigRenderSupport[kRGBA_float_GrPixelConfig][kNo_MSAA] = true;
             fConfigRenderSupport[kRGBA_float_GrPixelConfig][kYes_MSAA] = true;
         } else {
+            // for now we only enable this on desktop, because on ES we'd have to solve many
+            // precision issues and no clients actually want this yet
+            /*
             if (ctxInfo.hasExtension("GL_EXT_color_buffer_float")) {
                 fConfigRenderSupport[kRGBA_float_GrPixelConfig][kNo_MSAA] = true;
             } else {
                 fConfigRenderSupport[kRGBA_float_GrPixelConfig][kNo_MSAA] = false;
             }
             // for now we don't support floating point MSAA on ES
+            fConfigRenderSupport[kRGBA_float_GrPixelConfig][kYes_MSAA] = false;*/
+            fConfigRenderSupport[kRGBA_float_GrPixelConfig][kNo_MSAA] = false;
             fConfigRenderSupport[kRGBA_float_GrPixelConfig][kYes_MSAA] = false;
         }
     }
 
     if (this->isConfigTexturable(kAlpha_half_GrPixelConfig)) {
         if (kGL_GrGLStandard == standard) {
             fConfigRenderSupport[kAlpha_half_GrPixelConfig][kNo_MSAA] = true;
             fConfigRenderSupport[kAlpha_half_GrPixelConfig][kYes_MSAA] = true;
         } else if (ctxInfo.version() >= GR_GL_VER(3,0)) {
             fConfigRenderSupport[kAlpha_half_GrPixelConfig][kNo_MSAA] = true;
@@ skipping 615 matching lines @@
     if (fGeometryShaderSupport) {
         for (int p = 0; p < kGrSLPrecisionCount; ++p) {
             fFloatPrecisions[kGeometry_GrShaderType][p] = fFloatPrecisions[kVertex_GrShaderType][p];
         }
     }
 }