Merge commit 'origin/gallium-0.1' into gallium-0.2

1 files changed, 38 insertions, 1 deletions

diff --git a/src/mesa/shader/arbprogparse.c b/src/mesa/shader/arbprogparse.c
index d1c3cd7214..f499499eb3 100644
--- a/src/mesa/shader/arbprogparse.c
+++ b/src/mesa/shader/arbprogparse.c
@@ -30,6 +30,27 @@
  * \author Karl Rasche
  */
 
+/**
+Notes on program parameters, etc.
+
+The instructions we emit will use six kinds of source registers:
+
+  PROGRAM_INPUT      - input registers
+  PROGRAM_TEMPORARY  - temp registers
+  PROGRAM_ADDRESS    - address/indirect register
+  PROGRAM_SAMPLER    - texture sampler
+  PROGRAM_CONSTANT   - indexes into program->Parameters, a known constant/literal
+  PROGRAM_STATE_VAR  - indexes into program->Parameters, and may actually be:
+                       + a state variable, like "state.fog.color", or
+                       + a pointer to a "program.local[k]" parameter, or
+                       + a pointer to a "program.env[k]" parameter
+
+Basically, all the program.local[] and program.env[] values will get mapped
+into the unified gl_program->Parameters array.  This solves the problem of
+having three separate program parameter arrays.
+*/
+
+
 #include "main/glheader.h"
 #include "main/imports.h"
 #include "main/context.h"
@@ -1871,7 +1892,11 @@ parse_param_elements (GLcontext * ctx, const GLubyte ** inst,
                                         const_values, 4);
          if (param_var->param_binding_begin == ~0U)
             param_var->param_binding_begin = idx;
-         param_var->param_binding_type = PROGRAM_CONSTANT;
+         param_var->param_binding_type = PROGRAM_STATE_VAR;
+         /* Note: when we reference this parameter in an instruction later,
+          * we'll check if it's really a constant/immediate and set the
+          * instruction register type appropriately.
+          */
          param_var->param_binding_length++;
          Program->Base.NumParameters++;
          break;
@@ -2578,6 +2603,18 @@ parse_src_reg (GLcontext * ctx, const GLubyte ** inst,
          return 1;
    }
 
+   if (*File == PROGRAM_STATE_VAR) {
+      enum register_file file;
+
+      /* If we're referencing the Program->Parameters[] array, check if the
+       * parameter is really a constant/literal.  If so, set File to CONSTANT.
+       */
+      assert(*Index < Program->Base.Parameters->NumParameters);
+      file = Program->Base.Parameters->Parameters[*Index].Type;
+      if (file == PROGRAM_CONSTANT)
+         *File = PROGRAM_CONSTANT;
+   }
+
    /* Add attributes to InputsRead only if they are used the program.
     * This avoids the handling of unused ATTRIB declarations in the drivers. */
    if (*File == PROGRAM_INPUT)