[Mesa-dev] [PATCH 4/5] mesa/st: add support for emitting fine derivative opcodes

[Marek Olšák]

Reviewed-by: Marek Olšák <marek.olsak at amd.com>

Marek

On Thu, Aug 14, 2014 at 6:52 AM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
> Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
> ---
>  src/mesa/state_tracker/st_extensions.c     | 3 ++-
>  src/mesa/state_tracker/st_glsl_to_tgsi.cpp | 9 ++++++++-
>  2 files changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
> index eace321..24e886c 100644
> --- a/src/mesa/state_tracker/st_extensions.c
> +++ b/src/mesa/state_tracker/st_extensions.c
> @@ -458,7 +458,8 @@ void st_init_extensions(struct pipe_screen *screen,
>        { o(ARB_texture_multisample),          PIPE_CAP_TEXTURE_MULTISAMPLE              },
>        { o(ARB_texture_query_lod),            PIPE_CAP_TEXTURE_QUERY_LOD                },
>        { o(ARB_sample_shading),               PIPE_CAP_SAMPLE_SHADING                   },
> -      { o(ARB_draw_indirect),                PIPE_CAP_DRAW_INDIRECT                    }
> +      { o(ARB_draw_indirect),                PIPE_CAP_DRAW_INDIRECT                    },
> +      { o(ARB_derivative_control),           PIPE_CAP_TGSI_FS_FINE_DERIVATIVE          },
>     };
>
>     /* Required: render target and sampler support */
> diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
> index 4898166..84bdc4f 100644
> --- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
> +++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
> @@ -1462,9 +1462,15 @@ glsl_to_tgsi_visitor::visit(ir_expression *ir)
>        break;
>
>     case ir_unop_dFdx:
> +   case ir_unop_dFdx_coarse:
>        emit(ir, TGSI_OPCODE_DDX, result_dst, op[0]);
>        break;
> +   case ir_unop_dFdx_fine:
> +      emit(ir, TGSI_OPCODE_DDX_FINE, result_dst, op[0]);
> +      break;
>     case ir_unop_dFdy:
> +   case ir_unop_dFdy_coarse:
> +   case ir_unop_dFdy_fine:
>     {
>        /* The X component contains 1 or -1 depending on whether the framebuffer
>         * is a FBO or the window system buffer, respectively.
> @@ -1485,7 +1491,8 @@ glsl_to_tgsi_visitor::visit(ir_expression *ir)
>        st_src_reg temp = get_temp(glsl_type::vec4_type);
>
>        emit(ir, TGSI_OPCODE_MUL, st_dst_reg(temp), transform_y, op[0]);
> -      emit(ir, TGSI_OPCODE_DDY, result_dst, temp);
> +      emit(ir, ir->operation == ir_unop_dFdy_fine ?
> +           TGSI_OPCODE_DDY_FINE : TGSI_OPCODE_DDY, result_dst, temp);
>        break;
>     }
>
> --
> 1.8.5.5
>
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