r300compiler, r300 classic, r300g: Add support for MRTs in the frag shader.

This maybe breaks the vert compiler. Hopefully not.

8 files changed, 40 insertions, 14 deletions

diff --git a/src/gallium/drivers/r300/r300_fs.c b/src/gallium/drivers/r300/r300_fs.c
index 60ea9c171d..39bcdc8fe6 100644
--- a/src/gallium/drivers/r300/r300_fs.c
+++ b/src/gallium/drivers/r300/r300_fs.c
@@ -77,17 +77,21 @@ void r300_shader_read_fs_inputs(struct tgsi_shader_info* info,
 static void find_output_registers(struct r300_fragment_program_compiler * compiler,
                                   struct r300_fragment_shader * fs)
 {
-    unsigned i;
+    unsigned i, colorbuf_count = 0;
 
     /* Mark the outputs as not present initially */
-    compiler->OutputColor = fs->info.num_outputs;
+    compiler->OutputColor[0] = fs->info.num_outputs;
+    compiler->OutputColor[1] = fs->info.num_outputs;
+    compiler->OutputColor[2] = fs->info.num_outputs;
+    compiler->OutputColor[3] = fs->info.num_outputs;
     compiler->OutputDepth = fs->info.num_outputs;
 
     /* Now see where they really are. */
     for(i = 0; i < fs->info.num_outputs; ++i) {
         switch(fs->info.output_semantic_name[i]) {
             case TGSI_SEMANTIC_COLOR:
-                compiler->OutputColor = i;
+                compiler->OutputColor[colorbuf_count] = i;
+                colorbuf_count++;
                 break;
             case TGSI_SEMANTIC_POSITION:
                 compiler->OutputDepth = i;
diff --git a/src/mesa/drivers/dri/r300/compiler/r300_fragprog_emit.c b/src/mesa/drivers/dri/r300/compiler/r300_fragprog_emit.c
index 375838d98e..cc552aee17 100644
--- a/src/mesa/drivers/dri/r300/compiler/r300_fragprog_emit.c
+++ b/src/mesa/drivers/dri/r300/compiler/r300_fragprog_emit.c
@@ -176,7 +176,9 @@ static int emit_alu(struct r300_emit_state * emit, struct rc_pair_instruction* i
 			(inst->RGB.WriteMask << R300_ALU_DSTC_REG_MASK_SHIFT);
 	}
 	if (inst->RGB.OutputWriteMask) {
-		code->alu.inst[ip].rgb_addr |= (inst->RGB.OutputWriteMask << R300_ALU_DSTC_OUTPUT_MASK_SHIFT);
+		code->alu.inst[ip].rgb_addr |=
+            (inst->RGB.OutputWriteMask << R300_ALU_DSTC_OUTPUT_MASK_SHIFT) |
+            R300_RGB_TARGET(inst->RGB.Target);
 		emit->node_flags |= R300_RGBA_OUT;
 	}
 
@@ -187,7 +189,8 @@ static int emit_alu(struct r300_emit_state * emit, struct rc_pair_instruction* i
 			R300_ALU_DSTA_REG;
 	}
 	if (inst->Alpha.OutputWriteMask) {
-		code->alu.inst[ip].alpha_addr |= R300_ALU_DSTA_OUTPUT;
+		code->alu.inst[ip].alpha_addr |= R300_ALU_DSTA_OUTPUT |
+            R300_ALPHA_TARGET(inst->Alpha.Target);
 		emit->node_flags |= R300_RGBA_OUT;
 	}
 	if (inst->Alpha.DepthWriteMask) {
diff --git a/src/mesa/drivers/dri/r300/compiler/r3xx_fragprog.c b/src/mesa/drivers/dri/r300/compiler/r3xx_fragprog.c
index 5581f25352..c2d5dc27b4 100644
--- a/src/mesa/drivers/dri/r300/compiler/r3xx_fragprog.c
+++ b/src/mesa/drivers/dri/r300/compiler/r3xx_fragprog.c
@@ -35,7 +35,10 @@ static void dataflow_outputs_mark_use(void * userdata, void * data,
 		void (*callback)(void *, unsigned int, unsigned int))
 {
 	struct r300_fragment_program_compiler * c = userdata;
-	callback(data, c->OutputColor, RC_MASK_XYZW);
+	callback(data, c->OutputColor[0], RC_MASK_XYZW);
+	callback(data, c->OutputColor[1], RC_MASK_XYZW);
+	callback(data, c->OutputColor[2], RC_MASK_XYZW);
+	callback(data, c->OutputColor[3], RC_MASK_XYZW);
 	callback(data, c->OutputDepth, RC_MASK_W);
 }
 
diff --git a/src/mesa/drivers/dri/r300/compiler/r500_fragprog_emit.c b/src/mesa/drivers/dri/r300/compiler/r500_fragprog_emit.c
index b1b14394b6..c2eb613b23 100644
--- a/src/mesa/drivers/dri/r300/compiler/r500_fragprog_emit.c
+++ b/src/mesa/drivers/dri/r300/compiler/r500_fragprog_emit.c
@@ -241,6 +241,9 @@ static void emit_paired(struct r300_fragment_program_compiler *c, struct rc_pair
 	code->inst[ip].inst4 |= translate_arg_alpha(inst, 1) << R500_ALPHA_SEL_B_SHIFT;
 	code->inst[ip].inst5 |= translate_arg_alpha(inst, 2) << R500_ALU_RGBA_ALPHA_SEL_C_SHIFT;
 
+    code->inst[ip].inst3 |= R500_ALU_RGB_TARGET(inst->RGB.Target);
+    code->inst[ip].inst4 |= R500_ALPHA_TARGET(inst->Alpha.Target);
+
 	if (inst->WriteALUResult) {
 		code->inst[ip].inst3 |= R500_ALU_RGB_WMASK;
 
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_compiler.h b/src/mesa/drivers/dri/r300/compiler/radeon_compiler.h
index f27f858652..6bfda0574f 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_compiler.h
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_compiler.h
@@ -83,8 +83,10 @@ struct r300_fragment_program_compiler {
 	struct rX00_fragment_program_code *code;
 	struct r300_fragment_program_external_state state;
 	unsigned is_r500;
+    /* Register corresponding to the depthbuffer. */
 	unsigned OutputDepth;
-	unsigned OutputColor;
+    /* Registers corresponding to the four colorbuffers. */
+	unsigned OutputColor[4];
 
 	void * UserData;
 	void (*AllocateHwInputs)(
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_pair_translate.c b/src/mesa/drivers/dri/r300/compiler/radeon_pair_translate.c
index 7211768272..80cc5ffe95 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_pair_translate.c
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_pair_translate.c
@@ -203,12 +203,21 @@ static void set_pair_instruction(struct r300_fragment_program_compiler *c,
 
 	/* Destination handling */
 	if (inst->DstReg.File == RC_FILE_OUTPUT) {
-		if (inst->DstReg.Index == c->OutputColor) {
-			pair->RGB.OutputWriteMask |= inst->DstReg.WriteMask & RC_MASK_XYZ;
-			pair->Alpha.OutputWriteMask |= GET_BIT(inst->DstReg.WriteMask, 3);
-		} else if (inst->DstReg.Index == c->OutputDepth) {
-			pair->Alpha.DepthWriteMask |= GET_BIT(inst->DstReg.WriteMask, 3);
-		}
+        if (inst->DstReg.Index == c->OutputDepth) {
+            pair->Alpha.DepthWriteMask |= GET_BIT(inst->DstReg.WriteMask, 3);
+        } else {
+            for (i = 0; i < 4; i++) {
+                if (inst->DstReg.Index == c->OutputColor[i]) {
+                    pair->RGB.Target = inst->DstReg.Index;
+                    pair->Alpha.Target = inst->DstReg.Index;
+                    pair->RGB.OutputWriteMask |=
+                        inst->DstReg.WriteMask & RC_MASK_XYZ;
+                    pair->Alpha.OutputWriteMask |=
+                        GET_BIT(inst->DstReg.WriteMask, 3);
+                    break;
+                }
+            }
+        }
 	} else {
 		if (needrgb) {
 			pair->RGB.DestIndex = inst->DstReg.Index;
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_program_pair.h b/src/mesa/drivers/dri/r300/compiler/radeon_program_pair.h
index 6685ade3ea..511cc707a3 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_program_pair.h
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_program_pair.h
@@ -60,6 +60,7 @@ struct radeon_pair_instruction_rgb {
 	unsigned int Opcode:8;
 	unsigned int DestIndex:RC_REGISTER_INDEX_BITS;
 	unsigned int WriteMask:3;
+    unsigned int Target:2;
 	unsigned int OutputWriteMask:3;
 	unsigned int Saturate:1;
 
@@ -77,6 +78,7 @@ struct radeon_pair_instruction_alpha {
 	unsigned int Opcode:8;
 	unsigned int DestIndex:RC_REGISTER_INDEX_BITS;
 	unsigned int WriteMask:1;
+    unsigned int Target:2;
 	unsigned int OutputWriteMask:1;
 	unsigned int DepthWriteMask:1;
 	unsigned int Saturate:1;
diff --git a/src/mesa/drivers/dri/r300/r300_fragprog_common.c b/src/mesa/drivers/dri/r300/r300_fragprog_common.c
index e41aeff91a..3ec43e62bd 100644
--- a/src/mesa/drivers/dri/r300/r300_fragprog_common.c
+++ b/src/mesa/drivers/dri/r300/r300_fragprog_common.c
@@ -221,7 +221,7 @@ static void translate_fragment_program(GLcontext *ctx, struct r300_fragment_prog
 	compiler.state = fp->state;
 	compiler.is_r500 = (r300->radeon.radeonScreen->chip_family >= CHIP_FAMILY_RV515) ? GL_TRUE : GL_FALSE;
 	compiler.OutputDepth = FRAG_RESULT_DEPTH;
-	compiler.OutputColor = FRAG_RESULT_COLOR;
+	compiler.OutputColor[0] = FRAG_RESULT_COLOR;
 	compiler.AllocateHwInputs = &allocate_hw_inputs;
 
 	if (compiler.Base.Debug) {