Add glDrawRangeElements to GPU command buffer.

gpu/command_buffer/service/gles2_cmd_decoder.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/gles2_cmd_decoder.h"
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 7004 matching lines @@
       *static_cast<const gles2::cmds::DrawElements*>(cmd_data);
   return DoDrawElements("glDrawElements",
                         false,
                         static_cast<GLenum>(c.mode),
                         static_cast<GLsizei>(c.count),
                         static_cast<GLenum>(c.type),
                         static_cast<int32>(c.index_offset),
                         1);
 }
 
+error::Error GLES2DecoderImpl::HandleDrawRangeElements(
+    uint32 immediate_data_size,
+    const void* cmd_data) {
+  if (!unsafe_es3_apis_enabled())
+    return error::kUnknownCommand;
+  const gles2::cmds::DrawRangeElements& c =
+      *static_cast<const gles2::cmds::DrawRangeElements*>(cmd_data);
+  size_t offset = static_cast<size_t>(c.index_offset);
+  const GLvoid* indices = reinterpret_cast<const GLvoid*>(offset);
+  glDrawRangeElements(static_cast<GLenum>(c.mode),

[piman, 2015/02/25 23:28:47]

I'm pretty sure many things won't work right if we don't do some of the logic in
DoDrawElements, at least:
- PrepareTexturesForRender so that WillUseTexImage is called on GLImages bound
to the textures
- ApplyDirtyState so that the lazy frame buffer operation state is committed
(color/depth/stencil masks, depth/stencil test)
- ScopedRenderTo so that WillModifyTexImage/DidModifyTexImage is called on
GLImages bound to the FBO attachments

+                      static_cast<GLuint>(c.start),
+                      static_cast<GLuint>(c.end),
+                      static_cast<GLsizei>(c.count),
+                      static_cast<GLenum>(c.type),
+                      indices);
+  return error::kNoError;
+}
+
 error::Error GLES2DecoderImpl::HandleDrawElementsInstancedANGLE(
     uint32 immediate_data_size,
     const void* cmd_data) {
   const gles2::cmds::DrawElementsInstancedANGLE& c =
       *static_cast<const gles2::cmds::DrawElementsInstancedANGLE*>(cmd_data);
   if (!features().angle_instanced_arrays) {
     LOCAL_SET_GL_ERROR(
         GL_INVALID_OPERATION,
         "glDrawElementsInstancedANGLE", "function not available");
     return error::kNoError;
@@ skipping 5091 matching lines @@
   }
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu