glsl: fix bug in sampler array indexing

Need to add the 'offset' parameter when indexing the parameter array.
Before, if we were setting arrays of samplers, we were actually only
setting the 0th sampler's value.

Because of how progs/glsl/samplers.c is constructed, this wasn't showing
up as a failure in the samplers_array output.

diff --git a/src/mesa/shader/shader_api.c b/src/mesa/shader/shader_api.c
index 14da974..95b7490 100644 (file)
--- a/src/mesa/shader/shader_api.c
+++ b/src/mesa/shader/shader_api.c
@@ -1624,7 +1624,6 @@ set_program_uniform(GLcontext *ctx, struct gl_program *program,
 
    if (param->Type == PROGRAM_SAMPLER) {
       /* This controls which texture unit which is used by a sampler */
-      GLuint texUnit, sampler;
       GLint i;
 
       /* data type for setting samplers must be int */
@@ -1639,8 +1638,9 @@ set_program_uniform(GLcontext *ctx, struct gl_program *program,
        * common thing...
        */
       for (i = 0; i < count; i++) {
-         sampler = (GLuint) program->Parameters->ParameterValues[index + i][0];
-         texUnit = ((GLuint *) values)[i];
+         GLuint sampler =
+            (GLuint) program->Parameters->ParameterValues[index + offset + i][0];
+         GLuint texUnit = ((GLuint *) values)[i];
 
          /* check that the sampler (tex unit index) is legal */
          if (texUnit >= ctx->Const.MaxTextureImageUnits) {
@@ -1651,6 +1651,10 @@ set_program_uniform(GLcontext *ctx, struct gl_program *program,
 
          /* This maps a sampler to a texture unit: */
          if (sampler < MAX_SAMPLERS) {
+#if 0
+            _mesa_printf("Set program %p sampler %d '%s' to unit %u\n",
+                         program, sampler, param->Name, texUnit);
+#endif
             program->SamplerUnits[sampler] = texUnit;
          }
       }