Mesa (master): mesa/st: add support for emitting fine derivative opcodes

[Ilia Mirkin]

Module: Mesa
Branch: master
Commit: 88b0c6403fd97e5527a684732250162242f340c2
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=88b0c6403fd97e5527a684732250162242f340c2

Author: Ilia Mirkin <imirkin at alum.mit.edu>
Date:   Thu Aug 14 00:09:18 2014 -0400

mesa/st: add support for emitting fine derivative opcodes

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
Reviewed-by: Marek Olšák <marek.olsak at amd.com>

---

 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;
    }