From: Roland Scheidegger <rscheidegger@gmx.ch>
Date: Fri, 22 Sep 2006 15:48:50 +0000 (+0000)
Subject: fix up access to vertex attrib components which don't really exist but are defined... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9f819dc0145aabe18717dcd1de6e83e62bb8b19a;p=mesa.git

fix up access to vertex attrib components which don't really exist but are defined to some default value by the spec (fogcoord yzw, normal w, secondary color w), by replacing those components with zero/one respectively using swizzling.
---

diff --git a/src/mesa/drivers/dri/r200/r200_vertprog.c b/src/mesa/drivers/dri/r200/r200_vertprog.c
index cf0c15093fd..366d242270e 100644
--- a/src/mesa/drivers/dri/r200/r200_vertprog.c
+++ b/src/mesa/drivers/dri/r200/r200_vertprog.c
@@ -587,8 +587,46 @@ static GLboolean r200_translate_vertex_program(struct r200_vertex_program *vp)
       are_srcs_scalar = operands & SCALAR_FLAG;
       operands &= OP_MASK;
 
-      for(i = 0; i < operands; i++)
+      for(i = 0; i < operands; i++) {
 	 src[i] = vpi->SrcReg[i];
+	 /* hack up default attrib values as per spec as swizzling.
+	    normal, fog, secondary color. Crazy?
+	    May need more if we don't submit vec4 elements? */
+	 if (src[i].File == PROGRAM_INPUT) {
+	    if (src[i].Index == VERT_ATTRIB_NORMAL) {
+	       int j;
+	       for (j = 0; j < 4; j++) {
+		  if (GET_SWZ(src[i].Swizzle, j) == SWIZZLE_W) {
+		     src[i].Swizzle &= ~(SWIZZLE_W << (j*3));
+		     src[i].Swizzle |= SWIZZLE_ONE << (j*3);
+		  }
+	       }
+	    }
+	    else if (src[i].Index == VERT_ATTRIB_COLOR1) {
+	       int j;
+	       for (j = 0; j < 4; j++) {
+		  if (GET_SWZ(src[i].Swizzle, j) == SWIZZLE_W) {
+		     src[i].Swizzle &= ~(SWIZZLE_W << (j*3));
+		     src[i].Swizzle |= SWIZZLE_ZERO << (j*3);
+		  }
+	       }
+	    }
+	    else if (src[i].Index == VERT_ATTRIB_FOG) {
+	       int j;
+	       for (j = 0; j < 4; j++) {
+		  if (GET_SWZ(src[i].Swizzle, j) == SWIZZLE_W) {
+		     src[i].Swizzle &= ~(SWIZZLE_W << (j*3));
+		     src[i].Swizzle |= SWIZZLE_ONE << (j*3);
+		  }
+		  else if ((GET_SWZ(src[i].Swizzle, j) == SWIZZLE_Y) ||
+			    GET_SWZ(src[i].Swizzle, j) == SWIZZLE_Z) {
+		     src[i].Swizzle &= ~(SWIZZLE_W << (j*3));
+		     src[i].Swizzle |= SWIZZLE_ZERO << (j*3);
+		  }
+	       }
+	    }
+	 }
+      }
 
       if(operands == 3){
 	 if( CMP_SRCS(src[1], src[2]) || CMP_SRCS(src[0], src[2]) ){