[Mesa-dev] [PATCH v2] radv/gfx10: fix VS input VGPRs with the legacy path

[Bas Nieuwenhuizen]

r-b

On Tue, Jul 23, 2019 at 2:10 PM Samuel Pitoiset
<samuel.pitoiset at gmail.com> wrote:
>
> For some reasons, InstanceID is VGPR3 although StepRate0 is set to 1.
>
> v2: fix instanceID
>
> Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
> ---
>  src/amd/vulkan/radv_nir_to_llvm.c | 12 +++++++++---
>  src/amd/vulkan/radv_shader.c      |  2 +-
>  2 files changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/src/amd/vulkan/radv_nir_to_llvm.c b/src/amd/vulkan/radv_nir_to_llvm.c
> index 336bae28614..cf73cdc692b 100644
> --- a/src/amd/vulkan/radv_nir_to_llvm.c
> +++ b/src/amd/vulkan/radv_nir_to_llvm.c
> @@ -852,9 +852,15 @@ declare_vs_input_vgprs(struct radv_shader_context *ctx, struct arg_info *args)
>                         }
>                 } else {
>                         if (ctx->ac.chip_class >= GFX10) {
> -                               add_arg(args, ARG_VGPR, ctx->ac.i32, NULL); /* user vgpr */
> -                               add_arg(args, ARG_VGPR, ctx->ac.i32, NULL); /* user vgpr */
> -                               add_arg(args, ARG_VGPR, ctx->ac.i32, &ctx->abi.instance_id);
> +                               if (ctx->options->key.vs_common_out.as_ngg) {
> +                                       add_arg(args, ARG_VGPR, ctx->ac.i32, NULL); /* user vgpr */
> +                                       add_arg(args, ARG_VGPR, ctx->ac.i32, NULL); /* user vgpr */
> +                                       add_arg(args, ARG_VGPR, ctx->ac.i32, &ctx->abi.instance_id);
> +                               } else {
> +                                       add_arg(args, ARG_VGPR, ctx->ac.i32, NULL); /* unused */
> +                                       add_arg(args, ARG_VGPR, ctx->ac.i32, &ctx->vs_prim_id);
> +                                       add_arg(args, ARG_VGPR, ctx->ac.i32, &ctx->abi.instance_id);
> +                               }
>                         } else {
>                                 add_arg(args, ARG_VGPR, ctx->ac.i32, &ctx->abi.instance_id);
>                                 add_arg(args, ARG_VGPR, ctx->ac.i32, &ctx->vs_prim_id);
> diff --git a/src/amd/vulkan/radv_shader.c b/src/amd/vulkan/radv_shader.c
> index 3adaf52e152..3d1b56e7f60 100644
> --- a/src/amd/vulkan/radv_shader.c
> +++ b/src/amd/vulkan/radv_shader.c
> @@ -765,7 +765,7 @@ static void radv_postprocess_config(const struct radv_physical_device *pdevice,
>                         if (info->vs.export_prim_id) {
>                                 vgpr_comp_cnt = 2;
>                         } else if (info->info.vs.needs_instance_id) {
> -                               vgpr_comp_cnt = 1;
> +                               vgpr_comp_cnt = pdevice->rad_info.chip_class >= GFX10 ? 3 : 1;
>                         } else {
>                                 vgpr_comp_cnt = 0;
>                         }
> --
> 2.22.0
>
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