Tile Compression

gpu/command_buffer/service/feature_info.cc

Index: gpu/command_buffer/service/feature_info.cc
diff --git a/gpu/command_buffer/service/feature_info.cc b/gpu/command_buffer/service/feature_info.cc
index a15c791626fae6b3aad0eeb411a481fbfe98806d..48734678fcd6084735523ce78d7496a71c27026b 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -128,7 +128,9 @@ FeatureInfo::FeatureFlags::FeatureFlags()
       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_dxt(false),
       enable_shader_name_hashing(false),
       enable_samplers(false),
       ext_draw_buffers(false),
@@ -353,6 +355,23 @@ void FeatureInfo::InitializeFeatures() {
         GL_COMPRESSED_RGBA_S3TC_DXT5_EXT);
   }
 
+  if (enable_dxt1 && enable_dxt5) {
+    feature_flags_.ext_texture_format_dxt = true;
+  }
+
+  // Check if we should allow GL_AMD_compressed_ATC_texture.
+  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");