/*
 * Copyright 2009 Nicolai Hähnle <nhaehnle@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * on the rights to use, copy, modify, merge, publish, distribute, sub
 * license, and/or sell copies of the Software, and to permit persons to whom
 * the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE. */

#include "radeon_compiler.h"

#include <stdio.h>

#include "radeon_dataflow.h"
#include "radeon_program_alu.h"
#include "r300_fragprog.h"
#include "r300_fragprog_swizzle.h"
#include "r500_fragprog.h"


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->OutputDepth, RC_MASK_W);
}

static void rewrite_depth_out(struct r300_fragment_program_compiler * c)
{
	struct rc_instruction *rci;

	for (rci = c->Base.Program.Instructions.Next; rci != &c->Base.Program.Instructions; rci = rci->Next) {
		struct rc_sub_instruction * inst = &rci->U.I;

		if (inst->DstReg.File != RC_FILE_OUTPUT || inst->DstReg.Index != c->OutputDepth)
			continue;

		if (inst->DstReg.WriteMask & RC_MASK_Z) {
			inst->DstReg.WriteMask = RC_MASK_W;
		} else {
			inst->DstReg.WriteMask = 0;
			continue;
		}

		switch (inst->Opcode) {
			case RC_OPCODE_FRC:
			case RC_OPCODE_MOV:
				inst->SrcReg[0] = lmul_swizzle(RC_SWIZZLE_ZZZZ, inst->SrcReg[0]);
				break;
			case RC_OPCODE_ADD:
			case RC_OPCODE_MAX:
			case RC_OPCODE_MIN:
			case RC_OPCODE_MUL:
				inst->SrcReg[0] = lmul_swizzle(RC_SWIZZLE_ZZZZ, inst->SrcReg[0]);
				inst->SrcReg[1] = lmul_swizzle(RC_SWIZZLE_ZZZZ, inst->SrcReg[1]);
				break;
			case RC_OPCODE_CMP:
			case RC_OPCODE_MAD:
				inst->SrcReg[0] = lmul_swizzle(RC_SWIZZLE_ZZZZ, inst->SrcReg[0]);
				inst->SrcReg[1] = lmul_swizzle(RC_SWIZZLE_ZZZZ, inst->SrcReg[1]);
				inst->SrcReg[2] = lmul_swizzle(RC_SWIZZLE_ZZZZ, inst->SrcReg[2]);
				break;
			default:
				// Scalar instructions needn't be reswizzled
				break;
		}
	}
}

void r3xx_compile_fragment_program(struct r300_fragment_program_compiler* c)
{
	rewrite_depth_out(c);

	if (c->is_r500) {
		struct radeon_program_transformation transformations[] = {
			{ &r500_transform_TEX, c },
			{ &r500_transform_IF, 0 },
			{ &radeonTransformALU, 0 },
			{ &radeonTransformDeriv, 0 },
			{ &radeonTransformTrigScale, 0 }
		};
		radeonLocalTransform(&c->Base, 5, transformations);

		c->Base.SwizzleCaps = &r500_swizzle_caps;
	} else {
		struct radeon_program_transformation transformations[] = {
			{ &r300_transform_TEX, c },
			{ &radeonTransformALU, 0 },
			{ &radeonTransformTrigSimple, 0 }
		};
		radeonLocalTransform(&c->Base, 3, transformations);

		c->Base.SwizzleCaps = &r300_swizzle_caps;
	}

	if (c->Base.Debug) {
		fprintf(stderr, "Fragment Program: After native rewrite:\n");
		rc_print_program(&c->Base.Program);
		fflush(stderr);
	}

	rc_dataflow_deadcode(&c->Base, &dataflow_outputs_mark_use, c);
	if (c->Base.Error)
		return;

	if (c->Base.Debug) {
		fprintf(stderr, "Fragment Program: After deadcode:\n");
		rc_print_program(&c->Base.Program);
		fflush(stderr);
	}

	rc_dataflow_swizzles(&c->Base);
	if (c->Base.Error)
		return;

	if (c->Base.Debug) {
		fprintf(stderr, "Compiler: after dataflow passes:\n");
		rc_print_program(&c->Base.Program);
		fflush(stderr);
	}

	rc_pair_translate(c);
	if (c->Base.Error)
		return;

	if (c->Base.Debug) {
		fprintf(stderr, "Compiler: after pair translate:\n");
		rc_print_program(&c->Base.Program);
		fflush(stderr);
	}

	rc_pair_schedule(c);
	if (c->Base.Error)
		return;

	if (c->Base.Debug) {
		fprintf(stderr, "Compiler: after pair scheduling:\n");
		rc_print_program(&c->Base.Program);
		fflush(stderr);
	}

	if (c->is_r500)
		rc_pair_regalloc(c, 128);
	else
		rc_pair_regalloc(c, R300_PFS_NUM_TEMP_REGS);

	if (c->Base.Error)
		return;

	if (c->Base.Debug) {
		fprintf(stderr, "Compiler: after pair register allocation:\n");
		rc_print_program(&c->Base.Program);
		fflush(stderr);
	}

	if (c->is_r500) {
		r500BuildFragmentProgramHwCode(c);
	} else {
		r300BuildFragmentProgramHwCode(c);
	}

	rc_constants_copy(&c->code->constants, &c->Base.Program.Constants);

	if (c->Base.Debug) {
		if (c->is_r500) {
			r500FragmentProgramDump(c->code);
		} else {
			r300FragmentProgramDump(c->code);
		}
	}
}
