In practice this will disable varying packing on R300, R400, i915g,
and nv30.
Marek Olšák <mar...@gmail.com>
---
src/mesa/state_tracker/st_extensions.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/src/mesa/state_tracker/st_extensions.c
b/src/mesa/state_tracker/st_extensions.c
index 726d868..f3f01eb 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -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;
+ }
}
--
1.8.0.2
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