[Mesa-dev] [PATCH 3/3] radeonsi: fix the max vertex shader input limit

[Michel Dänzer]

On Don, 2013-05-02 at 05:45 +0200, Marek Olšák wrote: 
> ---
>  src/gallium/drivers/radeonsi/radeonsi_pipe.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/src/gallium/drivers/radeonsi/radeonsi_pipe.c b/src/gallium/drivers/radeonsi/radeonsi_pipe.c
> index c923c67..3b9be54 100644
> --- a/src/gallium/drivers/radeonsi/radeonsi_pipe.c
> +++ b/src/gallium/drivers/radeonsi/radeonsi_pipe.c
> @@ -481,7 +481,7 @@ static int r600_get_shader_param(struct pipe_screen* pscreen, unsigned shader, e
>         case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
>                 return 32;
>         case PIPE_SHADER_CAP_MAX_INPUTS:
> -               return 32;
> +               return shader == PIPE_SHADER_VERTEX ? 16 : 32;

For r600g, I assume the limit of 16 is due to the number of hardware
registers available for vertex shader inputs, but as of SI the state is
no longer stored in registers but in resource descriptors in a BO. In
theory, I think we could even support many more inputs than 32, but
let's just leave it at that for now. 

-- 
Earthling Michel Dänzer           |                   http://www.amd.com
Libre software enthusiast         |          Debian, X and DRI developer