r300/compiler: Refactor fragment program fog rewrite to use rc_program

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

src/mesa/drivers/dri/r300/compiler/r3xx_fragprog.c

@@ -156,42 +156,27 @@ static void insert_WPOS_trailer(struct r300_fragment_program_compiler *compiler)
 static void rewriteFog(struct r300_fragment_program_compiler *compiler)
 {
 	struct rX00_fragment_program_code *code = compiler->code;
-	GLuint InputsRead = compiler->program->InputsRead;
+	struct prog_src_register src;
 	int i;
 
-	if (!(InputsRead & FRAG_BIT_FOGC)) {
+	if (!(compiler->Base.Program.InputsRead & FRAG_BIT_FOGC)) {
 		code->fog_attr = FRAG_ATTRIB_MAX;
 		return;
 	}
 
 	for (i = FRAG_ATTRIB_TEX0; i <= FRAG_ATTRIB_TEX7; ++i)
 	{
-		if (!(InputsRead & (1 << i))) {
-			InputsRead &= ~(1 << FRAG_ATTRIB_FOGC);
-			InputsRead |= 1 << i;
-			compiler->program->InputsRead = InputsRead;
+		if (!(compiler->Base.Program.InputsRead & (1 << i))) {
 			code->fog_attr = i;
 			break;
 		}
 	}
 
-	{
-		struct prog_instruction *inst;
-
-		inst = compiler->program->Instructions;
-		while (inst->Opcode != OPCODE_END) {
-			const int src_regs = _mesa_num_inst_src_regs(inst->Opcode);
-			for (i = 0; i < src_regs; ++i) {
-				if (inst->SrcReg[i].File == PROGRAM_INPUT && inst->SrcReg[i].Index == FRAG_ATTRIB_FOGC) {
-					inst->SrcReg[i].Index = code->fog_attr;
-					inst->SrcReg[i].Swizzle = combine_swizzles(
-						MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_ZERO, SWIZZLE_ZERO, SWIZZLE_ONE),
-						inst->SrcReg[i].Swizzle);
-				}
-			}
-			++inst;
-		}
-	}
+	reset_srcreg(&src);
+	src.File = PROGRAM_INPUT;
+	src.Index = code->fog_attr;
+	src.Swizzle = MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_ZERO, SWIZZLE_ZERO, SWIZZLE_ONE);
+	rc_move_input(&compiler->Base, FRAG_ATTRIB_FOGC, src);
 }
 
 
@@ -248,10 +233,10 @@ void r3xx_compile_fragment_program(struct r300_fragment_program_compiler* c)
 
 	insert_WPOS_trailer(c);
 
-	rewriteFog(c);
-
 	rc_mesa_to_rc_program(&c->Base, c->program);
 
+	rewriteFog(c);
+
 	rewrite_depth_out(c);
 
 	if (c->is_r500) {

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

@@ -24,6 +24,8 @@
 
 #include <stdarg.h>
 
+#include "radeon_program.h"
+
 
 void rc_init(struct radeon_compiler * c)
 {
@@ -88,3 +90,33 @@ void rc_error(struct radeon_compiler * c, const char * fmt, ...)
 		va_end(ap);
 	}
 }
+
+/**
+ * Rewrite the program such that everything that source the given input
+ * register will source new_input instead.
+ */
+void rc_move_input(struct radeon_compiler * c, unsigned input, struct prog_src_register new_input)
+{
+	struct rc_instruction * inst;
+
+	c->Program.InputsRead &= ~(1 << input);
+
+	for(inst = c->Program.Instructions.Next; inst != &c->Program.Instructions; inst = inst->Next) {
+		const unsigned numsrcs = _mesa_num_inst_src_regs(inst->I.Opcode);
+		unsigned i;
+
+		for(i = 0; i < numsrcs; ++i) {
+			if (inst->I.SrcReg[i].File == PROGRAM_INPUT && inst->I.SrcReg[i].Index == input) {
+				inst->I.SrcReg[i].File = new_input.File;
+				inst->I.SrcReg[i].Index = new_input.Index;
+				inst->I.SrcReg[i].Swizzle = combine_swizzles(new_input.Swizzle, inst->I.SrcReg[i].Swizzle);
+				if (!inst->I.SrcReg[i].Abs) {
+					inst->I.SrcReg[i].Negate ^= new_input.Negate;
+					inst->I.SrcReg[i].Abs = new_input.Abs;
+				}
+
+				c->Program.InputsRead |= 1 << new_input.Index;
+			}
+		}
+	}
+}

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

@@ -64,6 +64,8 @@ void rc_destroy(struct radeon_compiler * c);
 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);
+
 struct r300_fragment_program_compiler {
 	struct radeon_compiler Base;
 	struct rX00_fragment_program_code *code;