comments

1 files changed, 22 insertions, 5 deletions

diff --git a/src/mesa/pipe/tgsi/mesa/mesa_to_tgsi.c b/src/mesa/pipe/tgsi/mesa/mesa_to_tgsi.c
index 291e62d262f..dc25bac4ea5 100644
--- a/src/mesa/pipe/tgsi/mesa/mesa_to_tgsi.c
+++ b/src/mesa/pipe/tgsi/mesa/mesa_to_tgsi.c
@@ -31,22 +31,34 @@ map_register_file(
    }

 }

 

-/*

+/**

  * Map mesa register file index to SBIR index.

  * Take special care when processing input and output indices.

+ * \param processor  either TGSI_PROCESSOR_FRAGMENT or  TGSI_PROCESSOR_VERTEX

+ * \param file  one of TGSI_FILE_x

+ * \param index  the mesa register file index

+ * \param usage_bitmask  ???

  */

 static GLuint

 map_register_file_index(

    GLuint processor,

    GLuint file,

    GLuint index,

-   GLuint usage_bitmask )

+   GLbitfield usage_bitmask )

 {

    GLuint mapped_index;

    GLuint i;

 

    switch( file ) {

    case TGSI_FILE_INPUT:

+      /*

+       * The fragment/vertex program input indexes (FRAG/VERT_ATTRIB_x) get

+       * mapped to a packed sequence of integers.

+       * If a program uses one input attribute, the mapped index will be 1.

+       * If a program uses two input attribs, the mapped indexes will be 1,2.

+       * If a program uses 3 input attribs, the mapped indexes will be 1,2,3.

+       * etc.

+       */

       assert( index < 32 );

       assert( usage_bitmask & (1 << index) );

       mapped_index = 0;

@@ -55,11 +67,15 @@ map_register_file_index(
             mapped_index++;

          }

       }

+      printf("Map input %d to %d\n", index, mapped_index);

       break;

 

    case TGSI_FILE_OUTPUT:

-      assert( usage_bitmask == 0 );

+      assert( usage_bitmask == 0x0 );

       if( processor == TGSI_PROCESSOR_FRAGMENT ) {

+         /* depth result  -> index 0

+          * color results -> index 1, 2, ...

+          */

 	 if( index == FRAG_RESULT_DEPR ) {

             mapped_index = 0;

          }

@@ -69,6 +85,7 @@ map_register_file_index(
          }

       }

       else {

+         /* mapped_index = VERT_RESULT_x */

          mapped_index = index;

       }

       break;

@@ -137,7 +154,7 @@ convert_writemask(
 

 static GLboolean

 compile_instruction(

-   struct prog_instruction *inst,

+   const struct prog_instruction *inst,

    struct tgsi_full_instruction *fullinst,

    GLuint inputs_read,

    GLuint processor )

@@ -158,7 +175,7 @@ compile_instruction(
       processor,

       fulldst->DstRegister.File,

       inst->DstReg.Index,

-      0 );

+      0x0 );

    fulldst->DstRegister.WriteMask = convert_writemask( inst->DstReg.WriteMask );

 

    for( i = 0; i < fullinst->Instruction.NumSrcRegs; i++ ) {