Add support for all blendmodes if we have GL_KHR_blend_equation_advanced.

gpu/command_buffer/build_gles2_cmd_buffer.py

Index: gpu/command_buffer/build_gles2_cmd_buffer.py
diff --git a/gpu/command_buffer/build_gles2_cmd_buffer.py b/gpu/command_buffer/build_gles2_cmd_buffer.py
index a6a6323e2f807c18f7a664ee203f08a3541185cc..f156f402abb3371e5a09b8db45b00c440de76c86 100755
--- a/gpu/command_buffer/build_gles2_cmd_buffer.py
+++ b/gpu/command_buffer/build_gles2_cmd_buffer.py
@@ -1553,6 +1553,12 @@ _FUNCTION_INFO = {
     'type': 'StateSet',
     'state': 'BlendFunc',
   },
+  'BlendBarrierNV': {
+    'gl_test_func': 'glBlendBarrierNV',

[piman, 2014/10/16 20:13:29]

At the command buffer level, I would prefer that we expose the vendor-neutral
KHR_blend_equation_advanced, which is a subset but looks enough for what we use
in cc. In the back-end, we can then use either KHR_blend_equation_advanced or
NV_blend_equation_advanced

[Erik Dahlström (inactive), 2014/10/17 15:33:17]

Agreed, will fix. Note that this also means I'll have to update
third_party/khronos since the current gl2ext.h there only has the NV extension,
not the KHR one.

+    'extension': True,
+    'extension_flag': 'blend_equation_advanced',
+    'client_test': False,
+  },
   'SampleCoverage': {'decoder_func': 'DoSampleCoverage'},
   'StencilFunc': {
     'type': 'StateSetFrontBack',