[Mesa-dev] [Mesa-stable] [PATCH 5/5] radeonsi/gfx9: fix geometry shaders without output vertices

[Dieter Nützel]

For the series:

Tested-by: Dieter Nützel <Dieter at nuetzel-hh.de>

Dieter

Am 26.09.2017 16:43, schrieb Nicolai Hähnle:
> From: Nicolai Hähnle <nicolai.haehnle at amd.com>
> 
> Not that those are super common or useful, but hey! Fun corner cases
> of the API...
> 
> Fixes dEQP-GLES31.functional.geometry_shading.emit.*
> 
> Cc: mesa-stable at lists.freedesktop.org
> ---
>  src/gallium/drivers/radeonsi/si_state_shaders.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/src/gallium/drivers/radeonsi/si_state_shaders.c
> b/src/gallium/drivers/radeonsi/si_state_shaders.c
> index 53a60ba11ed..985ee130e6d 100644
> --- a/src/gallium/drivers/radeonsi/si_state_shaders.c
> +++ b/src/gallium/drivers/radeonsi/si_state_shaders.c
> @@ -637,23 +637,25 @@ static void gfx9_get_gs_info(struct
> si_shader_selector *es,
>  	assert(gs_num_invocations <= 32); /* GL maximum */
> 
>  	if (uses_adjacency || gs_num_invocations > 1)
>  		max_gs_prims = 127 / gs_num_invocations;
>  	else
>  		max_gs_prims = 255;
> 
>  	/* MAX_PRIMS_PER_SUBGROUP = gs_prims * max_vert_out * gs_invocations.
>  	 * Make sure we don't go over the maximum value.
>  	 */
> -	max_gs_prims = MIN2(max_gs_prims,
> -			    max_out_prims /
> -			    (gs->gs_max_out_vertices * gs_num_invocations));
> +	if (gs->gs_max_out_vertices > 0) {
> +		max_gs_prims = MIN2(max_gs_prims,
> +				    max_out_prims /
> +				    (gs->gs_max_out_vertices * gs_num_invocations));
> +	}
>  	assert(max_gs_prims > 0);
> 
>  	/* If the primitive has adjacency, halve the number of vertices
>  	 * that will be reused in multiple primitives.
>  	 */
>  	min_es_verts = gs->gs_input_verts_per_prim / (uses_adjacency ? 2 : 
> 1);
> 
>  	gs_prims = MIN2(ideal_gs_prims, max_gs_prims);
>  	worst_case_es_verts = MIN2(min_es_verts * gs_prims, max_es_verts);