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gallium: Disable varying packing on hardware with <=8 texture indirections. 

In practice this will disable varying packing on R300, R400, i915g,
and nv30.

Reviewed-by: Marek Olšák <maraeo@gmail.com>
This commit is contained in:
Paul Berry 2012-12-13 12:45:54 -08:00
parent 6ee500cfd2
commit 4bb8661b1b
1 changed files with 14 additions and 0 deletions
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14
src/mesa/state_tracker/st_extensions.c
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@ -663,4 +663,18 @@ void st_init_extensions(struct st_context *st)
}
if (screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OBJECTS))
ctx->Extensions.ARB_texture_buffer_object = GL_TRUE;
/* Unpacking a varying in the fragment shader costs 1 texture indirection.
* If the number of available texture indirections is very limited, then we
* prefer to disable varying packing rather than run the risk of varying
* packing preventing a shader from running.
*/
if (screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS) <= 8) {
/* We can't disable varying packing if transform feedback is available,
* because transform feedback code assumes a packed varying layout.
*/
if (!ctx->Extensions.EXT_transform_feedback)
ctx->Const.DisableVaryingPacking = GL_TRUE;
}
}