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svga: Adjust alpha for S3TC_DXT1_EXT RGB formats

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According to spec, S3TC_DXT1_EXT RGB formats are supposed to be
opaque. Correspoding svga formats are not handling it so explicitly
setting it to 1.0.
This fixes piglit test spec@ext_texture_compression_s3tc@s3tc-targeted
Note: This test is testcase for freedesktop bug 100925

Tested with mtt-piglit and mtt-glretrace on 8,9,10,11 and 15

Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
Neha Bhende 2018-01-29 09:32:19 -07:00 • committed by Brian Paul
parent 6a7d1ca2c4
commit d4a5e14fae
1 changed files with 4 additions and 0 deletions
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4
src/gallium/drivers/svga/svga_shader.c
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@ -234,6 +234,10 @@ svga_init_shader_key_common(const struct svga_context *svga,
svga_texture_device_format_has_alpha(view->texture)) ?
set_alpha : copy_alpha;
if (view->texture->format == PIPE_FORMAT_DXT1_RGB ||
view->texture->format == PIPE_FORMAT_DXT1_SRGB)
swizzle_tab = set_alpha;
key->tex[i].swizzle_r = swizzle_tab[view->swizzle_r];
key->tex[i].swizzle_g = swizzle_tab[view->swizzle_g];
key->tex[i].swizzle_b = swizzle_tab[view->swizzle_b];