From 8b2955b736086103ac0d184a4b3f89d8ab8baab1 Mon Sep 17 00:00:00 2001
From: Brian <brian.paul@tungstengraphics.com>
Date: Wed, 25 Jul 2007 14:28:24 -0600
Subject: [PATCH] implement DDX, DDY instructions

---
 src/mesa/pipe/tgsi/core/tgsi_exec.c    | 34 ++++++++++++++++++++++++--
 src/mesa/pipe/tgsi/mesa/mesa_to_tgsi.c |  6 +++++
 2 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/src/mesa/pipe/tgsi/core/tgsi_exec.c b/src/mesa/pipe/tgsi/core/tgsi_exec.c
index db965ccbecd..6aaaef98a83 100644
--- a/src/mesa/pipe/tgsi/core/tgsi_exec.c
+++ b/src/mesa/pipe/tgsi/core/tgsi_exec.c
@@ -228,6 +228,28 @@ micro_cos(
    dst->f[3] = (GLfloat) cos( (GLdouble) src->f[3] );
 }
 
+static void
+micro_ddx(
+   union tgsi_exec_channel *dst,
+   const union tgsi_exec_channel *src )
+{
+   dst->f[0] =
+   dst->f[1] =
+   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 )
+{
+   dst->f[0] =
+   dst->f[1] =
+   dst->f[2] =
+   dst->f[3] = src->f[TILE_TOP_LEFT] - src->f[TILE_BOTTOM_LEFT];
+}
+
 static void
 micro_div(
    union tgsi_exec_channel *dst,
@@ -1715,11 +1737,19 @@ exec_instruction(
       break;
 
    case TGSI_OPCODE_DDX:
-      assert (0);
+      FOR_EACH_ENABLED_CHANNEL( *inst, chan_index ) {
+         FETCH( &r[0], 0, chan_index );
+         micro_ddx( &r[0], &r[0] );
+         STORE( &r[0], 0, chan_index );
+      }
       break;
 
    case TGSI_OPCODE_DDY:
-      assert (0);
+      FOR_EACH_ENABLED_CHANNEL( *inst, chan_index ) {
+         FETCH( &r[0], 0, chan_index );
+         micro_ddy( &r[0], &r[0] );
+         STORE( &r[0], 0, chan_index );
+      }
       break;
 
    case TGSI_OPCODE_KIL:
diff --git a/src/mesa/pipe/tgsi/mesa/mesa_to_tgsi.c b/src/mesa/pipe/tgsi/mesa/mesa_to_tgsi.c
index 21b488c98f1..a9415ac15bc 100644
--- a/src/mesa/pipe/tgsi/mesa/mesa_to_tgsi.c
+++ b/src/mesa/pipe/tgsi/mesa/mesa_to_tgsi.c
@@ -261,6 +261,12 @@ compile_instruction(
    case OPCODE_DP3:
       fullinst->Instruction.Opcode = TGSI_OPCODE_DP3;
       break;
+   case OPCODE_DDX:
+      fullinst->Instruction.Opcode = TGSI_OPCODE_DDX;
+      break;
+   case OPCODE_DDY:
+      fullinst->Instruction.Opcode = TGSI_OPCODE_DDY;
+      break;
    case OPCODE_DP4:
       fullinst->Instruction.Opcode = TGSI_OPCODE_DP4;
       break;
-- 
2.30.2