Implement support for rendering to 32-bit float textures on ES3

gpu/command_buffer/service/feature_info.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/feature_info.h"
 
 #include <set>
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 423 matching lines @@
     npot_ok = true;
   }
 
   // Check if we should allow GL_OES_texture_float, GL_OES_texture_half_float,
   // GL_OES_texture_float_linear, GL_OES_texture_half_float_linear
   bool enable_texture_float = false;
   bool enable_texture_float_linear = false;
   bool enable_texture_half_float = false;
   bool enable_texture_half_float_linear = false;
 
-  bool have_arb_texture_float = extensions.Contains("GL_ARB_texture_float");
-
-  if (have_arb_texture_float) {
+  if (extensions.Contains("GL_ARB_texture_float")) {
     enable_texture_float = true;
     enable_texture_float_linear = true;
     enable_texture_half_float = true;
     enable_texture_half_float_linear = true;
   } else {
-    if (extensions.Contains("GL_OES_texture_float") || have_arb_texture_float) {
+    if (extensions.Contains("GL_OES_texture_float")) {
       enable_texture_float = true;
-      if (extensions.Contains("GL_OES_texture_float_linear") ||
-          have_arb_texture_float) {
+      if (extensions.Contains("GL_OES_texture_float_linear")) {
         enable_texture_float_linear = true;
       }
     }
-    if (extensions.Contains("GL_OES_texture_half_float") ||
-        have_arb_texture_float) {
+    if (extensions.Contains("GL_OES_texture_half_float")) {
       enable_texture_half_float = true;
-      if (extensions.Contains("GL_OES_texture_half_float_linear") ||
-          have_arb_texture_float) {
+      if (extensions.Contains("GL_OES_texture_half_float_linear")) {
         enable_texture_half_float_linear = true;
       }
     }
   }
 
   if (enable_texture_float) {
     texture_format_validators_[GL_ALPHA].AddValue(GL_FLOAT);
     texture_format_validators_[GL_RGB].AddValue(GL_FLOAT);
     texture_format_validators_[GL_RGBA].AddValue(GL_FLOAT);
     texture_format_validators_[GL_LUMINANCE].AddValue(GL_FLOAT);
@@ skipping 252 matching lines @@
   if (extensions_.find(str) == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu