/**************************************************************************
*
* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
* 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, 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 TUNGSTEN GRAPHICS 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.
*
**************************************************************************/
#include "i915_reg.h"
#include "i915_context.h"
#include "i915_fpc.h"
#include "util/u_math.h"
uint
i915_get_temp(struct i915_fp_compile *p)
{
int bit = ffs(~p->temp_flag);
if (!bit) {
i915_program_error(p, "i915_get_temp: out of temporaries");
return 0;
}
p->temp_flag |= 1 << (bit - 1);
return bit - 1;
}
static void
i915_release_temp(struct i915_fp_compile *p, int reg)
{
p->temp_flag &= ~(1 << reg);
}
/**
* Get unpreserved temporary, a temp whose value is not preserved between
* PS program phases.
*/
uint
i915_get_utemp(struct i915_fp_compile * p)
{
int bit = ffs(~p->utemp_flag);
if (!bit) {
i915_program_error(p, "i915_get_utemp: out of temporaries");
return 0;
}
p->utemp_flag |= 1 << (bit - 1);
return UREG(REG_TYPE_U, (bit - 1));
}
void
i915_release_utemps(struct i915_fp_compile *p)
{
p->utemp_flag = ~0x7;
}
uint
i915_emit_decl(struct i915_fp_compile *p,
uint type, uint nr, uint d0_flags)
{
uint reg = UREG(type, nr);
if (type == REG_TYPE_T) {
if (p->decl_t & (1 << nr))
return reg;
p->decl_t |= (1 << nr);
}
else if (type == REG_TYPE_S) {
if (p->decl_s & (1 << nr))
return reg;
p->decl_s |= (1 << nr);
}
else
return reg;
if (p->decl< p->declarations + I915_PROGRAM_SIZE) {
*(p->decl++) = (D0_DCL | D0_DEST(reg) | d0_flags);
*(p->decl++) = D1_MBZ;
*(p->decl++) = D2_MBZ;
}
else
i915_program_error(p, "Out of declarations");
p->nr_decl_insn++;
return reg;
}
uint
i915_emit_arith(struct i915_fp_compile * p,
uint op,
uint dest,
uint mask,
uint saturate, uint src0, uint src1, uint src2)
{
uint c[3];
uint nr_const = 0;
assert(GET_UREG_TYPE(dest) != REG_TYPE_CONST);
dest = UREG(GET_UREG_TYPE(dest), GET_UREG_NR(dest));
assert(dest);
if (GET_UREG_TYPE(src0) == REG_TYPE_CONST)
c[nr_const++] = 0;
if (GET_UREG_TYPE(src1) == REG_TYPE_CONST)
c[nr_const++] = 1;
if (GET_UREG_TYPE(src2) == REG_TYPE_CONST)
c[nr_const++] = 2;
/* Recursively call this function to MOV additional const values
* into temporary registers. Use utemp registers for this -
* currently shouldn't be possible to run out, but keep an eye on
* this.
*/
if (nr_const > 1) {
uint s[3], first, i, old_utemp_flag;
s[0] = src0;
s[1] = src1;
s[2] = src2;
old_utemp_flag = p->utemp_flag;
first = GET_UREG_NR(s[c[0]]);
for (i = 1; i < nr_const; i++) {
if (GET_UREG_NR(s[c[i]]) != first) {
uint tmp = i915_get_utemp(p);
i915_emit_arith(p, A0_MOV, tmp, A0_DEST_CHANNEL_ALL, 0,
s[c[i]], 0, 0);
s[c[i]] = tmp;
}
}
src0 = s[0];
src1 = s[1];
src2 = s[2];
p->utemp_flag = old_utemp_flag; /* restore */
}
if (p->csr< p->program + I915_PROGRAM_SIZE) {
*(p->csr++) = (op | A0_DEST(dest) | mask | saturate | A0_SRC0(src0));
*(p->csr++) = (A1_SRC0(src0) | A1_SRC1(src1));
*(p->csr++) = (A2_SRC1(src1) | A2_SRC2(src2));
}
else
i915_program_error(p, "Out of instructions");
if (GET_UREG_TYPE(dest) == REG_TYPE_R)
p->register_phases[GET_UREG_NR(dest)] = p->nr_tex_indirect;
p->nr_alu_insn++;
return dest;
}
/**
* Emit a texture load or texkill instruction.
* \param dest the dest i915 register
* \param destmask the dest register writemask
* \param sampler the i915 sampler register
* \param coord the i915 source texcoord operand
* \param opcode the instruction opcode
*/
uint i915_emit_texld( struct i915_fp_compile *p,
uint dest,
uint destmask,
uint sampler,
uint coord,
uint opcode,
uint num_coord )
{
const uint k = UREG(GET_UREG_TYPE(coord), GET_UREG_NR(coord));
int temp = -1;
uint ignore = 0;
/* Eliminate the useless texture coordinates. Otherwise we end up generating
* a swizzle for no reason below. */
switch(num_coord) {
case 0:
/* Ignore x */
ignore |= (0xf << UREG_CHANNEL_X_SHIFT);
case 1:
/* Ignore y */
ignore |= (0xf << UREG_CHANNEL_Y_SHIFT);
case 2:
/* Ignore z */
ignore |= (0xf << UREG_CHANNEL_Z_SHIFT);
case 3:
/* Ignore w */
ignore |= (0xf << UREG_CHANNEL_W_SHIFT);
}
if ( (coord & ~ignore ) != (k & ~ignore) ) {
/* texcoord is swizzled or negated. Need to allocate a new temporary
* register (a utemp / unpreserved temp) won't do.
*/
uint tempReg;
temp = i915_get_temp(p); /* get temp reg index */
tempReg = UREG(REG_TYPE_R, temp); /* make i915 register */
i915_emit_arith( p, A0_MOV,
tempReg, A0_DEST_CHANNEL_ALL, /* dest reg, writemask */
0, /* saturate */
coord, 0, 0 ); /* src0, src1, src2 */
/* new src texcoord is tempReg */
coord = tempReg;
}
/* Don't worry about saturate as we only support
*/
if (destmask != A0_DEST_CHANNEL_ALL) {
/* if not writing to XYZW... */
uint tmp = i915_get_utemp(p);
i915_emit_texld( p, tmp, A0_DEST_CHANNEL_ALL, sampler, coord, opcode, num_coord );
i915_emit_arith( p, A0_MOV, dest, destmask, 0, tmp, 0, 0 );
/* XXX release utemp here? */
}
else {
assert(GET_UREG_TYPE(dest) != REG_TYPE_CONST);
assert(dest == UREG(GET_UREG_TYPE(dest), GET_UREG_NR(dest)));
/* Output register being oC or oD defines a phase boundary */
if (GET_UREG_TYPE(dest) == REG_TYPE_OC ||
GET_UREG_TYPE(dest) == REG_TYPE_OD)
p->nr_tex_indirect++;
/* Reading from an r# register whose contents depend on output of the
* current phase defines a phase boundary.
*/
if (GET_UREG_TYPE(coord) == REG_TYPE_R &&
p->register_phases[GET_UREG_NR(coord)] == p->nr_tex_indirect)
p->nr_tex_indirect++;
if (p->csr< p->program + I915_PROGRAM_SIZE) {
*(p->csr++) = (opcode |
T0_DEST( dest ) |
T0_SAMPLER( sampler ));
*(p->csr++) = T1_ADDRESS_REG( coord );
*(p->csr++) = T2_MBZ;
}
else
i915_program_error(p, "Out of instructions");
if (GET_UREG_TYPE(dest) == REG_TYPE_R)
p->register_phases[GET_UREG_NR(dest)] = p->nr_tex_indirect;
p->nr_tex_insn++;
}
if (temp >= 0)
i915_release_temp(p, temp);
return dest;
}
uint
i915_emit_const1f(struct i915_fp_compile * p, float c0)
{
struct i915_fragment_shader *ifs = p->shader;
unsigned reg, idx;
if (c0 == 0.0)
return swizzle(UREG(REG_TYPE_R, 0), ZERO, ZERO, ZERO, ZERO);
if (c0 == 1.0)
return swizzle(UREG(REG_TYPE_R, 0), ONE, ONE, ONE, ONE);
for (reg = 0; reg < I915_MAX_CONSTANT; reg++) {
if (ifs->constant_flags[reg] == I915_CONSTFLAG_USER)
continue;
for (idx = 0; idx < 4; idx++) {
if (!(ifs->constant_flags[reg] & (1 << idx)) ||
ifs->constants[reg][idx] == c0) {
ifs->constants[reg][idx] = c0;
ifs->constant_flags[reg] |= 1 << idx;
if (reg + 1 > ifs->num_constants)
ifs->num_constants = reg + 1;
return swizzle(UREG(REG_TYPE_CONST, reg), idx, ZERO, ZERO, ONE);
}
}
}
i915_program_error(p, "i915_emit_const1f: out of constants");
return 0;
}
uint
i915_emit_const2f(struct i915_fp_compile * p, float c0, float c1)
{
struct i915_fragment_shader *ifs = p->shader;
unsigned reg, idx;
if (c0 == 0.0)
return swizzle(i915_emit_const1f(p, c1), ZERO, X, Z, W);
if (c0 == 1.0)
return swizzle(i915_emit_const1f(p, c1), ONE, X, Z, W);
if (c1 == 0.0)
return swizzle(i915_emit_const1f(p, c0), X, ZERO, Z, W);
if (c1 == 1.0)
return swizzle(i915_emit_const1f(p, c0), X, ONE, Z, W);
// XXX emit swizzle here for 0, 1, -1 and any combination thereof
// we can use swizzle + neg for that
for (reg = 0; reg < I915_MAX_CONSTANT; reg++) {
if (ifs->constant_flags[reg] == 0xf ||
ifs->constant_flags[reg] == I915_CONSTFLAG_USER)
continue;
for (idx = 0; idx < 3; idx++) {
if (!(ifs->constant_flags[reg] & (3 << idx))) {
ifs->constants[reg][idx + 0] = c0;
ifs->constants[reg][idx + 1] = c1;
ifs->constant_flags[reg] |= 3 << idx;
if (reg + 1 > ifs->num_constants)
ifs->num_constants = reg + 1;
return swizzle(UREG(REG_TYPE_CONST, reg), idx, idx + 1, ZERO, ONE);
}
}
}
i915_program_error(p, "i915_emit_const2f: out of constants");
return 0;
}
uint
i915_emit_const4f(struct i915_fp_compile * p,
float c0, float c1, float c2, float c3)
{
struct i915_fragment_shader *ifs = p->shader;
unsigned reg;
// XXX emit swizzle here for 0, 1, -1 and any combination thereof
// we can use swizzle + neg for that
for (reg = 0; reg < I915_MAX_CONSTANT; reg++) {
if (ifs->constant_flags[reg] == 0xf &&
ifs->constants[reg][0] == c0 &&
ifs->constants[reg][1] == c1 &&
ifs->constants[reg][2] == c2 &&
ifs->constants[reg][3] == c3) {
return UREG(REG_TYPE_CONST, reg);
}
else if (ifs->constant_flags[reg] == 0) {
ifs->constants[reg][0] = c0;
ifs->constants[reg][1] = c1;
ifs->constants[reg][2] = c2;
ifs->constants[reg][3] = c3;
ifs->constant_flags[reg] = 0xf;
if (reg + 1 > ifs->num_constants)
ifs->num_constants = reg + 1;
return UREG(REG_TYPE_CONST, reg);
}
}
i915_program_error(p, "i915_emit_const4f: out of constants");
return 0;
}
uint
i915_emit_const4fv(struct i915_fp_compile * p, const float * c)
{
return i915_emit_const4f(p, c[0], c[1], c[2], c[3]);
}