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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 "r300_reg.h"
#include "radeon_nqssadce.h"
#define MAKE_SWZ3(x, y, z) (MAKE_SWIZZLE4(SWIZZLE_##x, SWIZZLE_##y, SWIZZLE_##z, SWIZZLE_ZERO))
struct swizzle_data {
GLuint hash; /**< swizzle value this matches */
GLuint base; /**< base value for hw swizzle */
GLuint stride; /**< difference in base between arg0/1/2 */
};
static const struct swizzle_data native_swizzles[] = {
{MAKE_SWZ3(X, Y, Z), R300_ALU_ARGC_SRC0C_XYZ, 4},
{MAKE_SWZ3(X, X, X), R300_ALU_ARGC_SRC0C_XXX, 4},
{MAKE_SWZ3(Y, Y, Y), R300_ALU_ARGC_SRC0C_YYY, 4},
{MAKE_SWZ3(Z, Z, Z), R300_ALU_ARGC_SRC0C_ZZZ, 4},
{MAKE_SWZ3(W, W, W), R300_ALU_ARGC_SRC0A, 1},
{MAKE_SWZ3(Y, Z, X), R300_ALU_ARGC_SRC0C_YZX, 1},
{MAKE_SWZ3(Z, X, Y), R300_ALU_ARGC_SRC0C_ZXY, 1},
{MAKE_SWZ3(W, Z, Y), R300_ALU_ARGC_SRC0CA_WZY, 1},
{MAKE_SWZ3(ONE, ONE, ONE), R300_ALU_ARGC_ONE, 0},
{MAKE_SWZ3(ZERO, ZERO, ZERO), R300_ALU_ARGC_ZERO, 0}
};
static const int num_native_swizzles = sizeof(native_swizzles)/sizeof(native_swizzles[0]);
/**
* Find a native RGB swizzle that matches the given swizzle.
* Returns 0 if none found.
*/
static const struct swizzle_data* lookup_native_swizzle(GLuint 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) {
GLuint swz = GET_SWZ(swizzle, comp);
if (swz == SWIZZLE_NIL)
continue;
if (swz != GET_SWZ(sd->hash, comp))
break;
}
if (comp == 3)
return sd;
}
return 0;
}
/**
* Check whether the given instruction supports the swizzle and negate
* combinations in the given source register.
*/
GLboolean r300FPIsNativeSwizzle(GLuint opcode, struct prog_src_register reg)
{
if (reg.Abs)
reg.Negate = NEGATE_NONE;
if (opcode == OPCODE_KIL ||
opcode == OPCODE_TEX ||
opcode == OPCODE_TXB ||
opcode == OPCODE_TXP) {
int j;
if (reg.Abs || reg.Negate)
return GL_FALSE;
for(j = 0; j < 4; ++j) {
GLuint swz = GET_SWZ(reg.Swizzle, j);
if (swz == SWIZZLE_NIL)
continue;
if (swz != j)
return GL_FALSE;
}
return GL_TRUE;
}
GLuint relevant = 0;
int j;
for(j = 0; j < 3; ++j)
if (GET_SWZ(reg.Swizzle, j) != SWIZZLE_NIL)
relevant |= 1 << j;
if ((reg.Negate & relevant) && ((reg.Negate & relevant) != relevant))
return GL_FALSE;
if (!lookup_native_swizzle(reg.Swizzle))
return GL_FALSE;
return GL_TRUE;
}
/**
* Generate MOV dst, src using only native swizzles.
*/
void r300FPBuildSwizzle(struct nqssadce_state *s, struct prog_dst_register dst, struct prog_src_register src)
{
if (src.Abs)
src.Negate = NEGATE_NONE;
while(dst.WriteMask) {
const struct swizzle_data *best_swizzle = 0;
GLuint best_matchcount = 0;
GLuint best_matchmask = 0;
int i, comp;
for(i = 0; i < num_native_swizzles; ++i) {
const struct swizzle_data *sd = &native_swizzles[i];
GLuint matchcount = 0;
GLuint matchmask = 0;
for(comp = 0; comp < 3; ++comp) {
if (!GET_BIT(dst.WriteMask, comp))
continue;
GLuint swz = GET_SWZ(src.Swizzle, comp);
if (swz == SWIZZLE_NIL)
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_swizzle = sd;
best_matchcount = matchcount;
best_matchmask = matchmask;
if (matchmask == (dst.WriteMask & WRITEMASK_XYZ))
break;
}
}
struct prog_instruction *inst;
_mesa_insert_instructions(s->Program, s->IP, 1);
inst = s->Program->Instructions + s->IP++;
inst->Opcode = OPCODE_MOV;
inst->DstReg = dst;
inst->DstReg.WriteMask &= (best_matchmask | WRITEMASK_W);
inst->SrcReg[0] = src;
inst->SrcReg[0].Negate = (best_matchmask & src.Negate) ? NEGATE_XYZW : NEGATE_NONE;
/* Note: We rely on NqSSA/DCE to set unused swizzle components to NIL */
dst.WriteMask &= ~inst->DstReg.WriteMask;
}
}
/**
* Translate an RGB (XYZ) swizzle into the hardware code for the given
* instruction source.
*/
GLuint r300FPTranslateRGBSwizzle(GLuint src, GLuint swizzle)
{
const struct swizzle_data* sd = lookup_native_swizzle(swizzle);
if (!sd) {
_mesa_printf("Not a native swizzle: %08x\n", swizzle);
return 0;
}
return sd->base + src*sd->stride;
}
/**
* Translate an Alpha (W) swizzle into the hardware code for the given
* instruction source.
*/
GLuint r300FPTranslateAlphaSwizzle(GLuint src, GLuint swizzle)
{
if (swizzle < 3)
return swizzle + 3*src;
switch(swizzle) {
case SWIZZLE_W: return R300_ALU_ARGA_SRC0A + src;
case SWIZZLE_ONE: return R300_ALU_ARGA_ONE;
case SWIZZLE_ZERO: return R300_ALU_ARGA_ZERO;
default: return R300_ALU_ARGA_ONE;
}
}
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