1 files changed, 27 insertions, 14 deletions

diff --git a/src/mesa/main/shaders.c b/src/mesa/main/shaders.c
index bc76b912913..d0dc7e551c9 100644
--- a/src/mesa/main/shaders.c
+++ b/src/mesa/main/shaders.c
@@ -26,6 +26,12 @@
 #include "glheader.h"
 #include "context.h"
 #include "shaders.h"
+#include "shader/shader_api.h"
+
+
+/** Define this to enable shader substitution (see below) */
+#define SHADER_SUBST 0
+
 
 
 /**
@@ -388,7 +394,6 @@ _mesa_read_shader(const char *fname)
    int len;
 
    if (!f) {
-      _mesa_fprintf(stderr, "Unable to open shader file %s\n", fname);
       return NULL;
    }
 
@@ -401,16 +406,10 @@ _mesa_read_shader(const char *fname)
    shader = _mesa_strdup(buffer);
    free(buffer);
 
-   if (0) {
-      _mesa_fprintf(stderr, "Read shader %s:\n", fname);
-      _mesa_fprintf(stderr, "%s\n", shader);
-   }
-
    return shader;
 }
 
 
-
 /**
  * Called via glShaderSource() and glShaderSourceARB() API functions.
  * Basically, concatenate the source code strings into one long string
@@ -424,6 +423,7 @@ _mesa_ShaderSourceARB(GLhandleARB shaderObj, GLsizei count,
    GLint *offsets;
    GLsizei i, totalLength;
    GLcharARB *source;
+   GLuint checksum;
 
    if (!shaderObj || string == NULL) {
       _mesa_error(ctx, GL_INVALID_VALUE, "glShaderSourceARB");
@@ -475,22 +475,35 @@ _mesa_ShaderSourceARB(GLhandleARB shaderObj, GLsizei count,
    source[totalLength - 1] = '\0';
    source[totalLength - 2] = '\0';
 
-#if 0
-   if (0) {
+   if (SHADER_SUBST) {
+      /* Compute the shader's source code checksum then try to open a file
+       * named newshader_<CHECKSUM>.  If it exists, use it in place of the
+       * original shader source code.  For debugging.
+       */
+      char filename[100];
       GLcharARB *newSource;
 
-      newSource = _mesa_read_shader("newshader.frag");
+      checksum = _mesa_str_checksum(source);
+
+      sprintf(filename, "newshader_%d", checksum);
+
+      newSource = _mesa_read_shader(filename);
       if (newSource) {
+         _mesa_fprintf(stderr, "Mesa: Replacing shader %u chksum=%d with %s\n",
+                       shaderObj, checksum, filename);
          _mesa_free(source);
          source = newSource;
       }
-   }
-#else
-   (void) _mesa_read_shader;
-#endif
+   }      
 
    ctx->Driver.ShaderSource(ctx, shaderObj, source);
 
+   if (SHADER_SUBST) {
+      struct gl_shader *sh = _mesa_lookup_shader(ctx, shaderObj);
+      if (sh)
+         sh->SourceChecksum = checksum; /* save original checksum */
+   }
+
    _mesa_free(offsets);
 }