r300/vertprog: Refactor fog_as_texcoord to use rc_program

Signed-off-by: Nicolai Hähnle <nhaehnle@gmail.com>

src/mesa/drivers/dri/r300/compiler/r3xx_vertprog.c

@@ -634,39 +634,6 @@ static void pos_as_texcoord(struct gl_program *prog, int tex_id)
 	prog->OutputsWritten |= 1 << (VERT_RESULT_TEX0 + tex_id);
 }
 
-/**
- * The fogcoord attribute is special in that only the first component
- * is relevant, and the remaining components are always fixed (when read
- * from by the fragment program) to yield an X001 pattern.
- *
- * We need to enforce this either in the vertex program or in the fragment
- * program, and this code chooses not to enforce it in the vertex program.
- * This is slightly cheaper, as long as the fragment program does not use
- * weird swizzles.
- *
- * And it seems that usually, weird swizzles are not used, so...
- *
- * See also the counterpart rewriting for fragment programs.
- */
-static void fog_as_texcoord(struct gl_program *prog, int tex_id)
-{
-	struct prog_instruction *vpi;
-
-	vpi = prog->Instructions;
-	while (vpi->Opcode != OPCODE_END) {
-		if (vpi->DstReg.File == PROGRAM_OUTPUT && vpi->DstReg.Index == VERT_RESULT_FOGC) {
-			vpi->DstReg.Index = VERT_RESULT_TEX0 + tex_id;
-			vpi->DstReg.WriteMask = WRITEMASK_X;
-		}
-
-		++vpi;
-	}
-
-	prog->OutputsWritten &= ~(1 << VERT_RESULT_FOGC);
-	prog->OutputsWritten |= 1 << (VERT_RESULT_TEX0 + tex_id);
-}
-
-
 static void addArtificialOutputs(struct r300_vertex_program_compiler * compiler)
 {
 	int i;
@@ -721,11 +688,12 @@ void r3xx_compile_vertex_program(struct r300_vertex_program_compiler* compiler)
 		pos_as_texcoord(compiler->program, compiler->state.WPosAttr - FRAG_ATTRIB_TEX0);
 	}
 
-	if (compiler->state.FogAttr != FRAG_ATTRIB_MAX) {
-		fog_as_texcoord(compiler->program, compiler->state.FogAttr - FRAG_ATTRIB_TEX0);
-	}
-
 	rc_mesa_to_rc_program(&compiler->Base, compiler->program);
+	compiler->program = 0;
+
+	if (compiler->state.FogAttr != FRAG_ATTRIB_MAX) {
+		rc_move_output(&compiler->Base, VERT_RESULT_FOGC, compiler->state.FogAttr - FRAG_ATTRIB_TEX0 + VERT_RESULT_TEX0, WRITEMASK_X);
+	}
 
 	addArtificialOutputs(compiler);
 

src/mesa/drivers/dri/r300/compiler/radeon_compiler.c

@@ -122,6 +122,32 @@ void rc_move_input(struct radeon_compiler * c, unsigned input, struct prog_src_r
 }
 
 
+/**
+ * Rewrite the program such that everything that writes into the given
+ * output register will instead write to new_output. The new_output
+ * writemask is honoured.
+ */
+void rc_move_output(struct radeon_compiler * c, unsigned output, unsigned new_output, unsigned writemask)
+{
+	struct rc_instruction * inst;
+
+	c->Program.OutputsWritten &= ~(1 << output);
+
+	for(inst = c->Program.Instructions.Next; inst != &c->Program.Instructions; inst = inst->Next) {
+		const unsigned numdsts = _mesa_num_inst_dst_regs(inst->I.Opcode);
+
+		if (numdsts) {
+			if (inst->I.DstReg.File == PROGRAM_OUTPUT && inst->I.DstReg.Index == output) {
+				inst->I.DstReg.Index = new_output;
+				inst->I.DstReg.WriteMask &= writemask;
+
+				c->Program.OutputsWritten |= 1 << new_output;
+			}
+		}
+	}
+}
+
+
 /**
  * Introduce standard code fragment to deal with fragment.position.
  */

src/mesa/drivers/dri/r300/compiler/radeon_compiler.h

@@ -65,6 +65,7 @@ void rc_debug(struct radeon_compiler * c, const char * fmt, ...);
 void rc_error(struct radeon_compiler * c, const char * fmt, ...);
 
 void rc_move_input(struct radeon_compiler * c, unsigned input, struct prog_src_register new_input);
+void rc_move_output(struct radeon_compiler * c, unsigned output, unsigned new_output, unsigned writemask);
 void rc_transform_fragment_wpos(struct radeon_compiler * c, unsigned wpos, unsigned new_input);
 
 struct r300_fragment_program_compiler {

src/mesa/drivers/dri/r300/r300_vertprog.c

@@ -161,6 +161,9 @@ static struct r300_vertex_program *build_program(GLcontext *ctx,
 	r3xx_compile_vertex_program(&compiler);
 	vp->error = compiler.Base.Error;
 
+	vp->Base->Base.InputsRead = vp->code.InputsRead;
+	vp->Base->Base.OutputsWritten = vp->code.OutputsWritten;
+
 	rc_destroy(&compiler.Base);
 
 	return vp;