gallium: fix the front face semantics

mesa allocates both frontface and pointcoord registers within the fog
coordinate register, by using swizzling. to make it cleaner and easier
for drivers we want each of them in its own register. so when doing
compilation from the mesa IR to tgsi allocate new registers for both
and add new semantics to the respective declarations.

3 files changed, 45 insertions, 4 deletions

diff --git a/src/mesa/state_tracker/st_atom_shader.c b/src/mesa/state_tracker/st_atom_shader.c
index ee649be885e..c02ccc35283 100644
--- a/src/mesa/state_tracker/st_atom_shader.c
+++ b/src/mesa/state_tracker/st_atom_shader.c
@@ -137,8 +137,23 @@ find_translated_vp(struct st_context *st,
 
       for (inAttr = 0; inAttr < FRAG_ATTRIB_MAX; inAttr++) {
          if (fragInputsRead & (1 << inAttr)) {
-            stfp->input_to_slot[inAttr] = numIn;
-            numIn++;
+            if ((fragInputsRead & FRAG_BIT_FOGC)) {
+               if (stfp->Base.UsesPointCoord) {
+                  stfp->input_to_slot[inAttr] = numIn;
+                  numIn++;
+               }
+               if (stfp->Base.UsesFrontFacing) {
+                  stfp->input_to_slot[inAttr] = numIn;
+                  numIn++;
+               }
+               if (stfp->Base.UsesFogFragCoord) {
+                  stfp->input_to_slot[inAttr] = numIn;
+                  numIn++;
+               }
+            } else {
+               stfp->input_to_slot[inAttr] = numIn;
+               numIn++;
+            }
          }
          else {
             stfp->input_to_slot[inAttr] = UNUSED;
diff --git a/src/mesa/state_tracker/st_mesa_to_tgsi.c b/src/mesa/state_tracker/st_mesa_to_tgsi.c
index 43c9afccc3b..3140ebe04ad 100644
--- a/src/mesa/state_tracker/st_mesa_to_tgsi.c
+++ b/src/mesa/state_tracker/st_mesa_to_tgsi.c
@@ -101,8 +101,10 @@ map_register_file(
  */
 static GLuint
 map_register_file_index(
+   GLuint procType,
    GLuint file,
    GLuint index,
+   GLuint *swizzle,
    const GLuint inputMapping[],
    const GLuint outputMapping[],
    const GLuint immediateMapping[],
@@ -110,6 +112,20 @@ map_register_file_index(
 {
    switch( file ) {
    case TGSI_FILE_INPUT:
+      if (procType == TGSI_PROCESSOR_FRAGMENT &&
+          index == FRAG_ATTRIB_FOGC) {
+         if (GET_SWZ(*swizzle, 0) == SWIZZLE_X) {
+            /* do nothing we're, ok */
+         } else if (GET_SWZ(*swizzle, 0) == SWIZZLE_Y) {
+            /* replace the swizzle with xxxx */
+            *swizzle = MAKE_SWIZZLE4(SWIZZLE_X,
+                                     SWIZZLE_X,
+                                     SWIZZLE_X,
+                                     SWIZZLE_X);
+         } else {
+            /* fixme: point coord */
+         }
+      }
       /* inputs are mapped according to the user-defined map */
       return inputMapping[index];
 
@@ -236,8 +252,10 @@ compile_instruction(
    fulldst = &fullinst->FullDstRegisters[0];
    fulldst->DstRegister.File = map_register_file( inst->DstReg.File, 0, NULL, GL_FALSE );
    fulldst->DstRegister.Index = map_register_file_index(
+      procType,
       fulldst->DstRegister.File,
       inst->DstReg.Index,
+      NULL,
       inputMapping,
       outputMapping,
       NULL,
@@ -246,6 +264,7 @@ compile_instruction(
 
    for (i = 0; i < fullinst->Instruction.NumSrcRegs; i++) {
       GLuint j;
+      GLuint swizzle = inst->SrcReg[i].Swizzle;
 
       fullsrc = &fullinst->FullSrcRegisters[i];
 
@@ -264,8 +283,10 @@ compile_instruction(
             immediateMapping,
             indirectAccess );
          fullsrc->SrcRegister.Index = map_register_file_index(
+            procType,
             fullsrc->SrcRegister.File,
             inst->SrcReg[i].Index,
+            &swizzle,
             inputMapping,
             outputMapping,
             immediateMapping,
@@ -278,7 +299,7 @@ compile_instruction(
          GLboolean extended = (inst->SrcReg[i].Negate != NEGATE_NONE &&
                                inst->SrcReg[i].Negate != NEGATE_XYZW);
          for( j = 0; j < 4; j++ ) {
-            swz[j] = GET_SWZ( inst->SrcReg[i].Swizzle, j );
+            swz[j] = GET_SWZ( swizzle, j );
             if (swz[j] > SWIZZLE_W)
                extended = GL_TRUE;
          }
diff --git a/src/mesa/state_tracker/st_program.c b/src/mesa/state_tracker/st_program.c
index 72ca8524582..9a346fbde0c 100644
--- a/src/mesa/state_tracker/st_program.c
+++ b/src/mesa/state_tracker/st_program.c
@@ -437,11 +437,16 @@ st_translate_fragment_program(struct st_context *st,
             if (stfp->Base.UsesPointCoord) {
                stfp->input_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
                stfp->input_semantic_index[slot] = num_generic++;
+               interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
+            } else if (stfp->Base.UsesFrontFacing) {
+               stfp->input_semantic_name[slot] = TGSI_SEMANTIC_FACE;
+               stfp->input_semantic_index[slot] = 0;
+               interpMode[slot] = TGSI_INTERPOLATE_CONSTANT;
             } else {
                stfp->input_semantic_name[slot] = TGSI_SEMANTIC_FOG;
                stfp->input_semantic_index[slot] = 0;
+               interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
 	    }
-            interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
             break;
          case FRAG_ATTRIB_TEX0:
          case FRAG_ATTRIB_TEX1: