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svga: Set alpha to 1 for non-alpha views

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Gallium RGB textures may be backed by imported ARGB svga3d surfaces. In those
and similar cases we need to set the alpha value to 1 when sampling.

Fixes piglit glx::glx-tfp

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Charmaine Lee <charmainel@vmware.com>
This commit is contained in:
Thomas Hellstrom 2017-04-26 06:00:38 -07:00
parent 1887faf73b
commit c2138a066c
1 changed files with 18 additions and 0 deletions
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18
src/gallium/drivers/svga/svga_shader.c
View file

@ -25,10 +25,13 @@
#include "util/u_bitmask.h"
#include "util/u_memory.h"
#include "util/u_format.h"
#include "svga_context.h"
#include "svga_cmd.h"
#include "svga_format.h"
#include "svga_shader.h"
#include "svga_resource_texture.h"
#include "svga3d_surfacedefs.h"
/**
@ -213,6 +216,21 @@ svga_init_shader_key_common(const struct svga_context *svga,
key->tex[i].swizzle_g = view->swizzle_g;
key->tex[i].swizzle_b = view->swizzle_b;
key->tex[i].swizzle_a = view->swizzle_a;
/* If we have a non-alpha view into an svga3d surface with an
* alpha channel, then explicitly set the alpha channel to 1
* when sampling. Note that we need to check the svga3d format
* in the svga texture key, since the imported format is
* stored here and it may differ from the gallium format.
*/
if (!util_format_has_alpha(view->format)) {
enum svga3d_block_desc block_desc =
svga3dsurface_get_desc(svga_texture(view->texture)->key.format)->
block_desc;
if (block_desc & SVGA3DBLOCKDESC_ALPHA)
key->tex[i].swizzle_a = PIPE_SWIZZLE_1;
}
}
}
}