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mesa: Remove support for GL_EXT_blend_logic_op

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Support is removed for four reasons:

1. The implementation was broken with respect to separate blend
equations.  The GL_EXT_blend_equation_separate spec says:

    "If EXT_blend_logic_op and EXT_blend_equation_separate are both
    supported, the logic op blend equation should be supported separately
    for RGB and alpha as with the other blend equation modes."

But Mesa's implementation of GL_LOGIC_OP specifically forbids this.

2. No hardware supported by Mesa can support separate blend equations
involving GL_LOGIC_OP.

3. No applications could be found that use this extension.

4. No other Linux OpenGL drivers support this extension.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Marek Olšák <maraeo@gmail.com>
Cc: Brian Paul <brianp@vmware.com>
This commit is contained in:
Ian Romanick
2011-09-09 14:14:42 -07:00
parent 3538bffa72
commit 113e8167de
4 changed files with 8 additions and 17 deletions
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2
src/mesa/main/extensions.c
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@@ -153,7 +153,6 @@ static const struct extension extension_table[] = {
{ "GL_EXT_blend_color", o(EXT_blend_color), GL, 1995 },
{ "GL_EXT_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
{ "GL_EXT_blend_func_separate", o(EXT_blend_func_separate), GL, 1999 },
{ "GL_EXT_blend_logic_op", o(EXT_blend_logic_op), GL, 1995 },
{ "GL_EXT_blend_minmax", o(EXT_blend_minmax), GL | ES1 | ES2, 1995 },
{ "GL_EXT_blend_subtract", o(EXT_blend_subtract), GL, 1995 },
{ "GL_EXT_clip_volume_hint", o(EXT_clip_volume_hint), GL, 1996 },
@@ -471,7 +470,6 @@ _mesa_enable_sw_extensions(struct gl_context *ctx)
ctx->Extensions.EXT_blend_color = GL_TRUE;
ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
ctx->Extensions.EXT_blend_minmax = GL_TRUE;
ctx->Extensions.EXT_blend_subtract = GL_TRUE;
ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;