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i965: Force zero swizzles for unused components in GL_RED and GL_RG

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This makes it possible to use a hardware luminance format as RED format.

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
This commit is contained in:
Gert Wollny 2018-11-15 19:01:23 +01:00 • committed by Gert Wollny
parent ebcde34545
commit c5363869d4
1 changed files with 4 additions and 0 deletions
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4
src/mesa/drivers/dri/i965/brw_wm_surface_state.c
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@ -420,7 +420,11 @@ brw_get_texture_swizzle(const struct gl_context *ctx,
}
break;
case GL_RED:
swizzles[1] = SWIZZLE_ZERO;
/* fallthrough */
case GL_RG:
swizzles[2] = SWIZZLE_ZERO;
/* fallthrough */
case GL_RGB:
if (_mesa_get_format_bits(img->TexFormat, GL_ALPHA_BITS) > 0 ||
img->TexFormat == MESA_FORMAT_RGB_DXT1 ||