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i965: Don't allow rendering to non-GL_RED/RG/RGBA integer textures.

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Fixes piglit EXT_texture_integer/fbo-blending.
(cherry picked from commit 3a8cf3357a)
This commit is contained in:
Eric Anholt 2012-01-24 16:32:36 -08:00 • committed by Ian Romanick
parent 0749290d69
commit 80cd02f517
1 changed files with 11 additions and 0 deletions
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11
src/mesa/drivers/dri/i965/brw_wm_surface_state.c
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@ -563,6 +563,17 @@ brw_render_target_supported(struct intel_context *intel,
struct brw_context *brw = brw_context(&intel->ctx);
gl_format format = rb->Format;
/* Many integer formats are promoted to RGBA (like XRGB8888 is), which means
* we would consider them renderable even though we don't have surface
* support for their alpha behavior and don't have the blending unit
* available to fake it like we do for XRGB8888. Force them to being
* unsupported.
*/
if ((rb->_BaseFormat != GL_RGBA &&
rb->_BaseFormat != GL_RG &&
rb->_BaseFormat != GL_RED) && _mesa_is_format_integer_color(format))
return false;
return brw->format_supported_as_render_target[format];
}