Add support for compressed GPU memory buffers.

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/macros.h"
@@ skipping 114 matching lines @@
       enable_texture_float_linear(false),
       enable_texture_half_float_linear(false),
       angle_translated_shader_source(false),
       angle_pack_reverse_row_order(false),
       arb_texture_rectangle(false),
       angle_instanced_arrays(false),
       occlusion_query_boolean(false),
       use_arb_occlusion_query2_for_occlusion_query_boolean(false),
       use_arb_occlusion_query_for_occlusion_query_boolean(false),
       native_vertex_array_object(false),
+      ext_texture_format_atc(false),
       ext_texture_format_bgra8888(false),
+      ext_texture_format_dxt1(false),
+      ext_texture_format_dxt5(false),
       enable_shader_name_hashing(false),
       enable_samplers(false),
       ext_draw_buffers(false),
       nv_draw_buffers(false),
       ext_frag_depth(false),
       ext_shader_texture_lod(false),
       use_async_readpixels(false),
       map_buffer_range(false),
       ext_discard_framebuffer(false),
       angle_depth_texture(false),
@@ skipping 180 matching lines @@
     enable_dxt1 = true;
   }
   if (have_dxt3) {
     enable_dxt3 = true;
   }
   if (have_dxt5) {
     enable_dxt5 = true;
   }
 
   if (enable_dxt1) {
+    feature_flags_.ext_texture_format_dxt1 = true;
+
     AddExtensionString("GL_EXT_texture_compression_dxt1");
     validators_.compressed_texture_format.AddValue(
         GL_COMPRESSED_RGB_S3TC_DXT1_EXT);
     validators_.compressed_texture_format.AddValue(
         GL_COMPRESSED_RGBA_S3TC_DXT1_EXT);
   }
 
   if (enable_dxt3) {
     // The difference between GL_EXT_texture_compression_s3tc and
     // GL_CHROMIUM_texture_compression_dxt3 is that the former
     // requires on the fly compression. The latter does not.
     AddExtensionString("GL_CHROMIUM_texture_compression_dxt3");
     validators_.compressed_texture_format.AddValue(
         GL_COMPRESSED_RGBA_S3TC_DXT3_EXT);
   }
 
   if (enable_dxt5) {
+    feature_flags_.ext_texture_format_dxt5 = true;
+
     // The difference between GL_EXT_texture_compression_s3tc and
     // GL_CHROMIUM_texture_compression_dxt5 is that the former
     // requires on the fly compression. The latter does not.
     AddExtensionString("GL_CHROMIUM_texture_compression_dxt5");
     validators_.compressed_texture_format.AddValue(
         GL_COMPRESSED_RGBA_S3TC_DXT5_EXT);
   }
 
+  bool have_atc = extensions.Contains("GL_AMD_compressed_ATC_texture") ||
+                  extensions.Contains("GL_ATI_texture_compression_atitc");
+  if (have_atc) {
+    feature_flags_.ext_texture_format_atc = true;
+
+    AddExtensionString("GL_AMD_compressed_ATC_texture");
+    validators_.compressed_texture_format.AddValue(GL_ATC_RGB_AMD);
+    validators_.compressed_texture_format.AddValue(
+        GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD);
+  }
+
   // Check if we should enable GL_EXT_texture_filter_anisotropic.
   if (extensions.Contains("GL_EXT_texture_filter_anisotropic")) {
     AddExtensionString("GL_EXT_texture_filter_anisotropic");
     validators_.texture_parameter.AddValue(
         GL_TEXTURE_MAX_ANISOTROPY_EXT);
     validators_.g_l_state.AddValue(
         GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT);
   }
 
   // Check if we should support GL_OES_packed_depth_stencil and/or
@@ skipping 673 matching lines @@
   if (pos == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu