From e38114a5e4492684333251eb22bc60ee1038de55 Mon Sep 17 00:00:00 2001
From: Keith Whitwell <keith@tungstengraphics.com>
Date: Wed, 20 Sep 2006 14:54:49 +0000
Subject: Support ARB_texture_rectangle.

---
 src/mesa/drivers/dri/i965/brw_wm_fp.c | 36 ++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

(limited to 'src/mesa/drivers/dri/i965/brw_wm_fp.c')

diff --git a/src/mesa/drivers/dri/i965/brw_wm_fp.c b/src/mesa/drivers/dri/i965/brw_wm_fp.c
index 2f59684866..8bf55790bf 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_fp.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_fp.c
@@ -520,6 +520,35 @@ static void precalc_lit( struct brw_wm_compile *c,
 static void precalc_tex( struct brw_wm_compile *c,
 			 const struct prog_instruction *inst )
 {
+   struct prog_src_register coord;
+   struct prog_dst_register tmpcoord;
+
+   if (inst->TexSrcTarget == TEXTURE_RECT_INDEX) {
+      struct prog_src_register scale = 
+	 search_or_add_param6( c, 
+			       STATE_INTERNAL, 
+			       STATE_TEXRECT_SCALE,
+			       inst->TexSrcUnit,
+			       0,0,0 );
+
+      tmpcoord = get_temp(c);
+
+      /* coord.xy   = MUL inst->SrcReg[0], { 1/width, 1/height }
+       */
+      emit_op(c,
+	      OPCODE_MUL,
+	      tmpcoord,
+	      0, 0, 0,
+	      inst->SrcReg[0],
+	      scale,
+	      src_undef());
+
+      coord = src_reg_from_dst(tmpcoord);
+   }
+   else {
+      coord = inst->SrcReg[0];
+   }
+
    /* Need to emit YUV texture conversions by hand.  Probably need to
     * do this here - the alternative is in brw_wm_emit.c, but the
     * conversion requires allocating a temporary variable which we
@@ -532,7 +561,7 @@ static void precalc_tex( struct brw_wm_compile *c,
 	      inst->SaturateMode,
 	      inst->TexSrcUnit,
 	      inst->TexSrcTarget,
-	      inst->SrcReg[0],
+	      coord,
 	      src_undef(),
 	      src_undef());
    }
@@ -604,7 +633,12 @@ static void precalc_tex( struct brw_wm_compile *c,
 	      src_swizzle1(tmpsrc, Z),
 	      src_swizzle1(C1, W),
 	      src_swizzle1(src_reg_from_dst(dst), Y));
+
+      release_temp(c, tmp);
    }
+
+   if (inst->TexSrcTarget == GL_TEXTURE_RECTANGLE_NV) 
+      release_temp(c, tmpcoord);
 }
 
 
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