command_buffer: Implement CHROMIUM_framebuffer_mixed_samples extension

gpu/command_buffer/service/gles2_cmd_decoder_autogen.h

 // Copyright 2014 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.
 
 // This file is auto-generated from
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
@@ skipping 4977 matching lines @@
   if (state_.stencil_path_func != func || state_.stencil_path_ref != ref ||
       state_.stencil_path_mask != mask) {
     state_.stencil_path_func = func;
     state_.stencil_path_ref = ref;
     state_.stencil_path_mask = mask;
     glPathStencilFuncNV(func, ref, mask);
   }
   return error::kNoError;
 }
 
+error::Error GLES2DecoderImpl::HandleCoverageModulationCHROMIUM(
+    uint32_t immediate_data_size,
+    const void* cmd_data) {
+  const gles2::cmds::CoverageModulationCHROMIUM& c =
+      *static_cast<const gles2::cmds::CoverageModulationCHROMIUM*>(cmd_data);
+  (void)c;
+  if (!features().chromium_framebuffer_mixed_samples) {
+    return error::kUnknownCommand;
+  }
+
+  GLenum components = static_cast<GLenum>(c.components);
+  if (!validators_->coverage_modulation_components.IsValid(components)) {
+    LOCAL_SET_GL_ERROR_INVALID_ENUM("glCoverageModulationCHROMIUM", components,
+                                    "components");
+    return error::kNoError;
+  }
+  if (state_.coverage_modulation != components) {
+    state_.coverage_modulation = components;
+    glCoverageModulationNV(components);
+  }
+  return error::kNoError;
+}
+
 error::Error GLES2DecoderImpl::HandleBlendBarrierKHR(
     uint32_t immediate_data_size,
     const void* cmd_data) {
   const gles2::cmds::BlendBarrierKHR& c =
       *static_cast<const gles2::cmds::BlendBarrierKHR*>(cmd_data);
   (void)c;
   if (!features().blend_equation_advanced) {
     return error::kUnknownCommand;
   }
 
@@ skipping 119 matching lines @@
         state_.enable_flags.cached_sample_alpha_to_one_ext = enabled;
         return true;
       }
       return false;
     default:
       NOTREACHED();
       return false;
   }
 }
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_AUTOGEN_H_