[Mesa-dev] [PATCH 04/14] mesa: Don't advertise extensions that are part of GL 1.4 in a core context

[Marek Olšák]

On Fri, Aug 10, 2012 at 3:42 AM, Ian Romanick <idr at freedesktop.org> wrote:
> On 08/08/2012 10:53 AM, Brian Paul wrote:
>>
>> On 08/08/2012 11:38 AM, Ian Romanick wrote:
>>>
>>> From: Ian Romanick<ian.d.romanick at intel.com>
>>>
>>> Signed-off-by: Ian Romanick<ian.d.romanick at intel.com>
>>> ---
>>>   src/mesa/main/extensions.c |   24 ++++++++++++------------
>>>   1 files changed, 12 insertions(+), 12 deletions(-)
>>>
>>> diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
>>> index 5115d42..cca1eac 100644
>>> --- a/src/mesa/main/extensions.c
>>> +++ b/src/mesa/main/extensions.c
>>> @@ -88,7 +88,7 @@ static const struct extension extension_table[] = {
>>>      { "GL_ARB_debug_output",
>>> o(dummy_true),                              GL,             2009 },
>>>      { "GL_ARB_depth_buffer_float",
>>> o(ARB_depth_buffer_float),                  GL,             2008 },
>>>      { "GL_ARB_depth_clamp",
>>> o(ARB_depth_clamp),                         GL,             2003 },
>>> -   { "GL_ARB_depth_texture",
>>> o(ARB_depth_texture),                       GL,             2001 },
>>> +   { "GL_ARB_depth_texture",
>>> o(ARB_depth_texture),                       GLL,            2001 },
>>>      { "GL_ARB_draw_buffers",
>>> o(dummy_true),                              GL,             2002 },
>>>      { "GL_ARB_draw_buffers_blend",
>>> o(ARB_draw_buffers_blend),                  GL,             2009 },
>>>      { "GL_ARB_draw_elements_base_vertex",
>>> o(ARB_draw_elements_base_vertex),           GL,             2009 },
>>> @@ -109,7 +109,7 @@ static const struct extension extension_table[] = {
>>>      { "GL_ARB_occlusion_query2",
>>> o(ARB_occlusion_query2),                    GL,             2003 },
>>>      { "GL_ARB_occlusion_query",
>>> o(ARB_occlusion_query),                     GL,             2001 },
>>>      { "GL_ARB_pixel_buffer_object",
>>> o(EXT_pixel_buffer_object),                 GL,             2004 },
>>> -   { "GL_ARB_point_parameters",
>>> o(EXT_point_parameters),                    GL,             1997 },
>>> +   { "GL_ARB_point_parameters",
>>> o(EXT_point_parameters),                    GLL,            1997 },
>>>      { "GL_ARB_point_sprite",
>>> o(ARB_point_sprite),                        GL,             2003 },
>>>      { "GL_ARB_provoking_vertex",
>>> o(EXT_provoking_vertex),                    GL,             2009 },
>>>      { "GL_ARB_robustness",
>>> o(dummy_true),                              GL,             2010 },
>>> @@ -121,7 +121,7 @@ static const struct extension extension_table[] = {
>>>      { "GL_ARB_shader_texture_lod",
>>> o(ARB_shader_texture_lod),                  GL,             2009 },
>>>      { "GL_ARB_shading_language_100",
>>> o(ARB_shading_language_100),                GLL,            2003 },
>>>      { "GL_ARB_shadow_ambient",
>>> o(ARB_shadow_ambient),                      GL,             2001 },
>>
>>
>> I think GL_ARB_shadow_ambient would go hand-in-hand with GL_ARB_shadow.
>
>
> I didn't include that extension because it never became part of any GL
> version.  It's just an extension.  I believe that Radeon hardware supports
> this natively.  Everyone else would need to add a MAX instruction in the
> shader, so nobody ever bothered.  Realistically, it's only useful with fixed
> function.

The extension doesn't seem to be enabled on *any* hardware driver
whatsoever. It was decided that Gallium wouldn't implement it, because
the extension was considered not very useful back then and much less
now.

Marek