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/*
* Copyright (C) 2008 Nicolai Haehnle.
*
* All Rights Reserved.
*
* 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 the rights to use, copy, modify, merge, publish,
* distribute, sublicense, 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 NONINFRINGEMENT.
* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS 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.
*
*/
/**
* @file
* Utilities to deal with the somewhat odd restriction on R300 fragment
* program swizzles.
*/
#include "r300_fragprog_swizzle.h"
#include <stdio.h>
#include "util/macros.h"
#include "r300_reg.h"
#include "radeon_compiler.h"
#define MAKE_SWZ3(x, y, z) (RC_MAKE_SWIZZLE(RC_SWIZZLE_##x, RC_SWIZZLE_##y, RC_SWIZZLE_##z, RC_SWIZZLE_ZERO))
struct swizzle_data {
unsigned int hash; /**< swizzle value this matches */
unsigned int base; /**< base value for hw swizzle */
unsigned int stride; /**< difference in base between arg0/1/2 */
unsigned int srcp_stride; /**< difference in base between arg0/scrp */
};
static const struct swizzle_data native_swizzles[] = {
{MAKE_SWZ3(X, Y, Z), R300_ALU_ARGC_SRC0C_XYZ, 4, 15},
{MAKE_SWZ3(X, X, X), R300_ALU_ARGC_SRC0C_XXX, 4, 15},
{MAKE_SWZ3(Y, Y, Y), R300_ALU_ARGC_SRC0C_YYY, 4, 15},
{MAKE_SWZ3(Z, Z, Z), R300_ALU_ARGC_SRC0C_ZZZ, 4, 15},
{MAKE_SWZ3(W, W, W), R300_ALU_ARGC_SRC0A, 1, 7},
{MAKE_SWZ3(Y, Z, X), R300_ALU_ARGC_SRC0C_YZX, 1, 0},
{MAKE_SWZ3(Z, X, Y), R300_ALU_ARGC_SRC0C_ZXY, 1, 0},
{MAKE_SWZ3(W, Z, Y), R300_ALU_ARGC_SRC0CA_WZY, 1, 0},
{MAKE_SWZ3(ONE, ONE, ONE), R300_ALU_ARGC_ONE, 0, 0},
{MAKE_SWZ3(ZERO, ZERO, ZERO), R300_ALU_ARGC_ZERO, 0, 0},
{MAKE_SWZ3(HALF, HALF, HALF), R300_ALU_ARGC_HALF, 0, 0}
};
static const int num_native_swizzles = ARRAY_SIZE(native_swizzles);
/**
* Find a native RGB swizzle that matches the given swizzle.
* Returns 0 if none found.
*/
static const struct swizzle_data* lookup_native_swizzle(unsigned int swizzle)
{
int i, comp;
for(i = 0; i < num_native_swizzles; ++i) {
const struct swizzle_data* sd = &native_swizzles[i];
for(comp = 0; comp < 3; ++comp) {
unsigned int swz = GET_SWZ(swizzle, comp);
if (swz == RC_SWIZZLE_UNUSED)
continue;
if (swz != GET_SWZ(sd->hash, comp))
break;
}
if (comp == 3)
return sd;
}
return 0;
}
/**
* Determines if the given swizzle is valid for r300/r400. In most situations
* it is better to use r300_swizzle_is_native() which can be accesed via
* struct radeon_compiler *c; c->SwizzleCaps->IsNative().
*/
int r300_swizzle_is_native_basic(unsigned int swizzle)
{
if(lookup_native_swizzle(swizzle))
return 1;
else
return 0;
}
/**
* Check whether the given instruction supports the swizzle and negate
* combinations in the given source register.
*/
static int r300_swizzle_is_native(rc_opcode opcode, struct rc_src_register reg)
{
const struct swizzle_data* sd;
unsigned int relevant;
int j;
if (opcode == RC_OPCODE_KIL ||
opcode == RC_OPCODE_TEX ||
opcode == RC_OPCODE_TXB ||
opcode == RC_OPCODE_TXP) {
if (reg.Abs || reg.Negate)
return 0;
for(j = 0; j < 4; ++j) {
unsigned int swz = GET_SWZ(reg.Swizzle, j);
if (swz == RC_SWIZZLE_UNUSED)
continue;
if (swz != j)
return 0;
}
return 1;
}
relevant = 0;
for(j = 0; j < 3; ++j)
if (GET_SWZ(reg.Swizzle, j) != RC_SWIZZLE_UNUSED)
relevant |= 1 << j;
if ((reg.Negate & relevant) && ((reg.Negate & relevant) != relevant))
return 0;
sd = lookup_native_swizzle(reg.Swizzle);
if (!sd || (reg.File == RC_FILE_PRESUB && sd->srcp_stride == 0))
return 0;
return 1;
}
static void r300_swizzle_split(
struct rc_src_register src, unsigned int mask,
struct rc_swizzle_split * split)
{
split->NumPhases = 0;
while(mask) {
unsigned int best_matchcount = 0;
unsigned int best_matchmask = 0;
int i, comp;
for(i = 0; i < num_native_swizzles; ++i) {
const struct swizzle_data *sd = &native_swizzles[i];
unsigned int matchcount = 0;
unsigned int matchmask = 0;
for(comp = 0; comp < 3; ++comp) {
unsigned int swz;
if (!GET_BIT(mask, comp))
continue;
swz = GET_SWZ(src.Swizzle, comp);
if (swz == RC_SWIZZLE_UNUSED)
continue;
if (swz == GET_SWZ(sd->hash, comp)) {
/* check if the negate bit of current component
* is the same for already matched components */
if (matchmask && (!!(src.Negate & matchmask) != !!(src.Negate & (1 << comp))))
continue;
matchcount++;
matchmask |= 1 << comp;
}
}
if (matchcount > best_matchcount) {
best_matchcount = matchcount;
best_matchmask = matchmask;
if (matchmask == (mask & RC_MASK_XYZ))
break;
}
}
if (mask & RC_MASK_W)
best_matchmask |= RC_MASK_W;
split->Phase[split->NumPhases++] = best_matchmask;
mask &= ~best_matchmask;
}
}
struct rc_swizzle_caps r300_swizzle_caps = {
.IsNative = r300_swizzle_is_native,
.Split = r300_swizzle_split
};
/**
* Translate an RGB (XYZ) swizzle into the hardware code for the given
* instruction source.
*/
unsigned int r300FPTranslateRGBSwizzle(unsigned int src, unsigned int swizzle)
{
const struct swizzle_data* sd = lookup_native_swizzle(swizzle);
if (!sd || (src == RC_PAIR_PRESUB_SRC && sd->srcp_stride == 0)) {
fprintf(stderr, "Not a native swizzle: %08x\n", swizzle);
return 0;
}
if (src == RC_PAIR_PRESUB_SRC) {
return sd->base + sd->srcp_stride;
} else {
return sd->base + src*sd->stride;
}
}
/**
* Translate an Alpha (W) swizzle into the hardware code for the given
* instruction source.
*/
unsigned int r300FPTranslateAlphaSwizzle(unsigned int src, unsigned int swizzle)
{
unsigned int swz = GET_SWZ(swizzle, 0);
if (src == RC_PAIR_PRESUB_SRC) {
return R300_ALU_ARGA_SRCP_X + swz;
}
if (swz < 3)
return swz + 3*src;
switch(swz) {
case RC_SWIZZLE_W: return R300_ALU_ARGA_SRC0A + src;
case RC_SWIZZLE_ONE: return R300_ALU_ARGA_ONE;
case RC_SWIZZLE_ZERO: return R300_ALU_ARGA_ZERO;
case RC_SWIZZLE_HALF: return R300_ALU_ARGA_HALF;
default: return R300_ALU_ARGA_ONE;
}
}
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