Re-submission of http://codereview.chromium.org/9968113

This version corrects the problem that caussed the revert of the above issue.  The shaders used by the extension were specifying a precision, which is not supported on desktop GL.  The shaders now conditionally specify the precision. 

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Introduction of CHROMIUM_copy_texture extension that respects pixel-store semantics, and allows copying of BGRA textures.

OpenGL ES does not natively allow for copying textures with a BGRA format. The EXT_texture_format_BGRA8888 extension does not specify support for glCopyTexImage calls on these textures.

This extension provides a routine to perform texture copies to/from BGRA-backed textures that also respects the following CHROMIUM pixel storage modifiers:
UNPACK_FLIP_Y_CHROMIUM
UNPACK_PREMULTIPLY_ALPHA_CHROMIUM

This extension will be useful for the following purposes:
- Copying accelerated Canvas2D contents to WebGL textures without a software readback. (And potentially the same for video-webgl texture copies.)
- Copying Canvas2D contents to the compositor backing store.

BUG=101051
TEST=none

Review URL: http://codereview.chromium.org/10124016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@133213 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 5 insertions, 0 deletions

diff --git a/gpu/command_buffer/common/gles2_cmd_utils_implementation_autogen.h b/gpu/command_buffer/common/gles2_cmd_utils_implementation_autogen.h
index 2d725d0..d99da6d 100644
--- a/gpu/command_buffer/common/gles2_cmd_utils_implementation_autogen.h
+++ b/gpu/command_buffer/common/gles2_cmd_utils_implementation_autogen.h
@@ -289,9 +289,11 @@ static GLES2Util::EnumToString enum_to_string_table[] = {
   { 0x8DF2, "GL_HIGH_FLOAT", },
   { 0x8826, "GL_DRAW_BUFFER1_NV", },
   { 0x8827, "GL_DRAW_BUFFER2_NV", },
+  { 0x9243, "GL_UNPACK_COLORSPACE_CONVERSION_CHROMIUM", },
   { 0x8DF3, "GL_LOW_INT", },
   { 0x8B53, "GL_INT_VEC2", },
   { 0x0C02, "GL_READ_BUFFER_NV", },
+  { 0x9241, "GL_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM", },
   { 0x8B52, "GL_FLOAT_VEC4", },
   { 0x9240, "GL_UNPACK_FLIP_Y_CHROMIUM", },
   { 0x8B51, "GL_FLOAT_VEC3", },
@@ -887,6 +889,9 @@ std::string GLES2Util::GetStringPixelStore(uint32 value) {
   static EnumToString string_table[] = {
     { GL_PACK_ALIGNMENT, "GL_PACK_ALIGNMENT" },
     { GL_UNPACK_ALIGNMENT, "GL_UNPACK_ALIGNMENT" },
+    { GL_UNPACK_FLIP_Y_CHROMIUM, "GL_UNPACK_FLIP_Y_CHROMIUM" },
+    { GL_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM,
+    "GL_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM" },
   };
   return GLES2Util::GetQualifiedEnumString(
       string_table, arraysize(string_table), value);