From 84d1b24647c0719551e8bcd5fa4601fbd3b1d555 Mon Sep 17 00:00:00 2001
From: Ian Romanick <idr@us.ibm.com>
Date: Thu, 7 Jun 2007 13:38:06 -0700
Subject: Fix ARB_fp spec conformance bug WRT shadow sampling.

The ARB_fp (and other assembly-level fragment program specs) say that the
depth comparison function is always GL_NONE in fragment program mode.
---
 src/mesa/swrast/s_fragprog.c  | 16 ++++++++++++++++
 src/mesa/swrast/s_texfilter.c | 20 +-------------------
 2 files changed, 17 insertions(+), 19 deletions(-)

(limited to 'src/mesa/swrast')

diff --git a/src/mesa/swrast/s_fragprog.c b/src/mesa/swrast/s_fragprog.c
index e47dbbdaf3..f5ffe41fc1 100644
--- a/src/mesa/swrast/s_fragprog.c
+++ b/src/mesa/swrast/s_fragprog.c
@@ -26,6 +26,7 @@
 #include "colormac.h"
 #include "context.h"
 #include "prog_instruction.h"
+#include "texstate.h"
 
 #include "s_fragprog.h"
 #include "s_span.h"
@@ -199,6 +200,7 @@ void
 _swrast_exec_fragment_program( GLcontext *ctx, SWspan *span )
 {
    const struct gl_fragment_program *program = ctx->FragmentProgram._Current;
+   GLuint i;
 
    /* incoming colors should be floats */
    if (program->Base.InputsRead & FRAG_BIT_COL0) {
@@ -207,8 +209,22 @@ _swrast_exec_fragment_program( GLcontext *ctx, SWspan *span )
 
    ctx->_CurrentProgram = GL_FRAGMENT_PROGRAM_ARB; /* or NV, doesn't matter */
 
+   for (i = 0; i < ctx->Const.MaxTextureImageUnits; i++) {
+      if (ctx->Texture.Unit[i]._Current != NULL) {
+         _mesa_update_texture_compare_function(ctx->Texture.Unit[i]._Current,
+                                               GL_TRUE);
+      }
+   }
+
    run_program(ctx, span, 0, span->end);
 
+   for (i = 0; i < ctx->Const.MaxTextureImageUnits; i++) {
+      if (ctx->Texture.Unit[i]._Current != NULL) {
+         _mesa_update_texture_compare_function(ctx->Texture.Unit[i]._Current,
+                                               GL_FALSE);
+      }
+   }
+
    if (program->Base.OutputsWritten & (1 << FRAG_RESULT_COLR)) {
       span->interpMask &= ~SPAN_RGBA;
       span->arrayMask |= SPAN_RGBA;
diff --git a/src/mesa/swrast/s_texfilter.c b/src/mesa/swrast/s_texfilter.c
index 2c8e443daf..d4516f6faa 100644
--- a/src/mesa/swrast/s_texfilter.c
+++ b/src/mesa/swrast/s_texfilter.c
@@ -2893,25 +2893,7 @@ sample_depth_texture( GLcontext *ctx,
 
    /* XXXX if tObj->MinFilter != tObj->MagFilter, we're ignoring lambda */
 
-   /* XXX this could be precomputed and saved in the texture object */
-   if (tObj->CompareFlag) {
-      /* GL_SGIX_shadow */
-      if (tObj->CompareOperator == GL_TEXTURE_LEQUAL_R_SGIX) {
-         function = GL_LEQUAL;
-      }
-      else {
-         ASSERT(tObj->CompareOperator == GL_TEXTURE_GEQUAL_R_SGIX);
-         function = GL_GEQUAL;
-      }
-   }
-   else if (tObj->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB) {
-      /* GL_ARB_shadow */
-      function = tObj->CompareFunc;
-   }
-   else {
-      function = GL_NONE;  /* pass depth through as grayscale */
-   }
-
+   function = tObj->_Function;
    if (tObj->MagFilter == GL_NEAREST) {
       GLuint i;
       for (i = 0; i < n; i++) {
-- 
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