softpipe: Add support for ARB_derivative_control

Enables and passes piglits:

spec/ARB_drivative_control/
        dfdx-coarse
        dfdx-dfdy
        dfdx-fine
        dfdy-coarse
        dfdy-fine

Signed-off-by: Gert Wollny <[email protected]>
Reviewed-by: Roland Scheidegger <[email protected]>

1 files changed, 29 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/tgsi/tgsi_exec.c b/src/gallium/auxiliary/tgsi/tgsi_exec.c
index 18ee27502b4..0633a4e708c 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_exec.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_exec.c
@@ -218,6 +218,17 @@ micro_ddx(union tgsi_exec_channel *dst,
 }
 
 static void
+micro_ddx_fine(union tgsi_exec_channel *dst,
+          const union tgsi_exec_channel *src)
+{
+   dst->f[0] =
+   dst->f[1] = src->f[TILE_TOP_RIGHT] - src->f[TILE_TOP_LEFT];
+   dst->f[2] =
+   dst->f[3] = src->f[TILE_BOTTOM_RIGHT] - src->f[TILE_BOTTOM_LEFT];
+}
+
+
+static void
 micro_ddy(union tgsi_exec_channel *dst,
           const union tgsi_exec_channel *src)
 {
@@ -228,6 +239,16 @@ micro_ddy(union tgsi_exec_channel *dst,
 }
 
 static void
+micro_ddy_fine(union tgsi_exec_channel *dst,
+          const union tgsi_exec_channel *src)
+{
+   dst->f[0] =
+   dst->f[2] = src->f[TILE_BOTTOM_LEFT] - src->f[TILE_TOP_LEFT];
+   dst->f[1] =
+   dst->f[3] = src->f[TILE_BOTTOM_RIGHT] - src->f[TILE_TOP_RIGHT];
+}
+
+static void
 micro_dmul(union tgsi_double_channel *dst,
            const union tgsi_double_channel *src)
 {
@@ -5398,10 +5419,18 @@ exec_instruction(
       exec_scalar_unary(mach, inst, micro_cos, TGSI_EXEC_DATA_FLOAT, TGSI_EXEC_DATA_FLOAT);
       break;
 
+   case TGSI_OPCODE_DDX_FINE:
+      exec_vector_unary(mach, inst, micro_ddx_fine, TGSI_EXEC_DATA_FLOAT, TGSI_EXEC_DATA_FLOAT);
+      break;
+
    case TGSI_OPCODE_DDX:
       exec_vector_unary(mach, inst, micro_ddx, TGSI_EXEC_DATA_FLOAT, TGSI_EXEC_DATA_FLOAT);
       break;
 
+   case TGSI_OPCODE_DDY_FINE:
+      exec_vector_unary(mach, inst, micro_ddy_fine, TGSI_EXEC_DATA_FLOAT, TGSI_EXEC_DATA_FLOAT);
+      break;
+
    case TGSI_OPCODE_DDY:
       exec_vector_unary(mach, inst, micro_ddy, TGSI_EXEC_DATA_FLOAT, TGSI_EXEC_DATA_FLOAT);
       break;