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mesa/src/mesa/state_tracker/st_atifs_to_nir.c

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/*
* Copyright (C) 2016 Miklós Máté
* Copyright (C) 2020 Google LLC
*
* 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 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 AUTHORS OR COPYRIGHT HOLDERS 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 "main/mtypes.h"
#include "main/atifragshader.h"
#include "main/errors.h"
#include "program/prog_parameter.h"
#include "program/prog_instruction.h"
#include "program/prog_to_nir.h"
#include "st_program.h"
#include "st_atifs_to_nir.h"
#include "compiler/nir/nir_builder.h"
#define FOG_PARAMS_UNIFORM (MAX_NUM_FRAGMENT_CONSTANTS_ATI + 0)
#define FOG_COLOR_UNIFORM (MAX_NUM_FRAGMENT_CONSTANTS_ATI + 1)
/**
* Intermediate state used during shader translation.
*/
struct st_translate {
nir_builder *b;
struct ati_fragment_shader *atifs;
const struct st_fp_variant_key *key;
nir_ssa_def *temps[MAX_PROGRAM_TEMPS];
nir_variable *fragcolor;
nir_variable *constants;
nir_variable *samplers[MAX_TEXTURE_UNITS];
nir_ssa_def *inputs[VARYING_SLOT_MAX];
unsigned current_pass;
bool regs_written[MAX_NUM_PASSES_ATI][MAX_NUM_FRAGMENT_REGISTERS_ATI];
boolean error;
};
static nir_ssa_def *
nir_channel_vec4(nir_builder *b, nir_ssa_def *src, unsigned channel)
{
unsigned swizzle[4] = { channel, channel, channel, channel };
return nir_swizzle(b, src, swizzle, 4);
}
static nir_ssa_def *
nir_imm_vec4_float(nir_builder *b, float f)
{
return nir_channel_vec4(b, nir_imm_float(b, f), 0);
}
static nir_ssa_def *
get_temp(struct st_translate *t, unsigned index)
{
if (!t->temps[index])
t->temps[index] = nir_ssa_undef(t->b, 4, 32);
return t->temps[index];
}
static nir_ssa_def *
apply_swizzle(struct st_translate *t,
struct nir_ssa_def *src, GLuint swizzle)
{
/* From the ATI_fs spec:
*
* "Table 3.20 shows the <swizzle> modes:
*
* Coordinates Used for 1D or Coordinates Used for
* Swizzle 2D SampleMap and PassTexCoord 3D or cubemap SampleMap
* ------- ----------------------------- -----------------------
* SWIZZLE_STR_ATI (s, t, r, undefined) (s, t, r, undefined)
* SWIZZLE_STQ_ATI (s, t, q, undefined) (s, t, q, undefined)
* SWIZZLE_STR_DR_ATI (s/r, t/r, 1/r, undefined) (undefined)
* SWIZZLE_STQ_DQ_ATI (s/q, t/q, 1/q, undefined) (undefined)
*/
if (swizzle == GL_SWIZZLE_STR_ATI) {
return src;
} else if (swizzle == GL_SWIZZLE_STQ_ATI) {
static unsigned xywz[4] = { 0, 1, 3, 2 };
return nir_swizzle(t->b, src, xywz, 4);
} else {
nir_ssa_def *rcp = nir_frcp(t->b, nir_channel(t->b, src,
swizzle == GL_SWIZZLE_STR_DR_ATI ? 2 : 3));
nir_ssa_def *st_mul = nir_fmul(t->b, nir_channels(t->b, src, 0x3), rcp);
return nir_vec4(t->b,
nir_channel(t->b, st_mul, 0),
nir_channel(t->b, st_mul, 1),
rcp,
rcp);
}
}
static nir_ssa_def *
load_input(struct st_translate *t, gl_varying_slot slot)
{
if (!t->inputs[slot]) {
const char *slot_name =
gl_varying_slot_name_for_stage(slot, MESA_SHADER_FRAGMENT);
nir_variable *var = nir_variable_create(t->b->shader, nir_var_shader_in,
slot == VARYING_SLOT_FOGC ?
glsl_float_type() : glsl_vec4_type(),
slot_name);
var->data.location = slot;
var->data.interpolation = INTERP_MODE_NONE;
t->inputs[slot] = nir_load_var(t->b, var);
}
return t->inputs[slot];
}
static nir_ssa_def *
atifs_load_uniform(struct st_translate *t, int index)
{
nir_deref_instr *deref = nir_build_deref_array(t->b,
nir_build_deref_var(t->b, t->constants),
nir_imm_int(t->b, index));
return nir_load_deref(t->b, deref);
}
static struct nir_ssa_def *
get_source(struct st_translate *t, GLenum src_type)
{
if (src_type >= GL_REG_0_ATI && src_type <= GL_REG_5_ATI) {
if (t->regs_written[t->current_pass][src_type - GL_REG_0_ATI]) {
return get_temp(t, src_type - GL_REG_0_ATI);
} else {
return nir_imm_vec4_float(t->b, 0.0);
}
} else if (src_type >= GL_CON_0_ATI && src_type <= GL_CON_7_ATI) {
int index = src_type - GL_CON_0_ATI;
if (t->atifs->LocalConstDef & (1 << index)) {
return nir_imm_vec4(t->b,
t->atifs->Constants[index][0],
t->atifs->Constants[index][1],
t->atifs->Constants[index][2],
t->atifs->Constants[index][3]);
} else {
return atifs_load_uniform(t, index);
}
} else if (src_type == GL_ZERO) {
return nir_imm_vec4_float(t->b, 0.0);
} else if (src_type == GL_ONE) {
return nir_imm_vec4_float(t->b, 1.0);
} else if (src_type == GL_PRIMARY_COLOR_ARB) {
return load_input(t, VARYING_SLOT_COL0);
} else if (src_type == GL_SECONDARY_INTERPOLATOR_ATI) {
return load_input(t, VARYING_SLOT_COL1);
} else {
/* frontend prevents this */
unreachable("unknown source");
}
}
static nir_ssa_def *
prepare_argument(struct st_translate *t, const struct atifs_instruction *inst,
const unsigned argId, bool alpha)
{
if (argId >= inst->ArgCount[alpha]) {
_mesa_warning(0, "Using 0 for missing argument %d\n", argId);
return nir_imm_vec4_float(t->b, 0.0f);
}
const struct atifragshader_src_register *srcReg = &inst->SrcReg[alpha][argId];
nir_ssa_def *src = get_source(t, srcReg->Index);
switch (srcReg->argRep) {
case GL_NONE:
break;
case GL_RED:
src = nir_channel_vec4(t->b, src, 0);
break;
case GL_GREEN:
src = nir_channel_vec4(t->b, src, 1);
break;
case GL_BLUE:
src = nir_channel_vec4(t->b, src, 2);
break;
case GL_ALPHA:
src = nir_channel_vec4(t->b, src, 3);
break;
}
t->temps[MAX_NUM_FRAGMENT_REGISTERS_ATI + argId] = src;
if (srcReg->argMod & GL_COMP_BIT_ATI)
src = nir_fsub(t->b, nir_imm_vec4_float(t->b, 1.0), src);
if (srcReg->argMod & GL_BIAS_BIT_ATI)
src = nir_fadd(t->b, src, nir_imm_vec4_float(t->b, -0.5));
if (srcReg->argMod & GL_2X_BIT_ATI)
src = nir_fadd(t->b, src, src);
if (srcReg->argMod & GL_NEGATE_BIT_ATI)
src = nir_fneg(t->b, src);
return src;
}
static nir_ssa_def *
emit_arith_inst(struct st_translate *t,
const struct atifs_instruction *inst,
bool alpha)
{
nir_ssa_def *src[3] = {0};
for (int i = 0; i < inst->ArgCount[alpha]; i++)
src[i] = prepare_argument(t, inst, i, alpha);
switch (inst->Opcode[alpha]) {
case GL_MOV_ATI:
return src[0];
case GL_ADD_ATI:
return nir_fadd(t->b, src[0], src[1]);
case GL_SUB_ATI:
return nir_fsub(t->b, src[0], src[1]);
case GL_MUL_ATI:
return nir_fmul(t->b, src[0], src[1]);
case GL_MAD_ATI:
return nir_ffma(t->b, src[0], src[1], src[2]);
case GL_LERP_ATI:
return nir_flrp(t->b, src[2], src[1], src[0]);
case GL_CND_ATI:
return nir_bcsel(t->b,
nir_fge(t->b, nir_imm_vec4_float(t->b, 0.5), src[2]),
src[1],
src[0]);
case GL_CND0_ATI:
return nir_bcsel(t->b,
nir_fge(t->b, src[2], nir_imm_vec4_float(t->b, 0.0)),
src[0],
src[1]);
case GL_DOT2_ADD_ATI:
return nir_channel_vec4(t->b,
nir_fadd(t->b,
nir_fdot2(t->b, src[0], src[1]),
nir_channel(t->b, src[1], 2)),
0);
case GL_DOT3_ATI:
return nir_channel_vec4(t->b, nir_fdot3(t->b,src[0], src[1]), 0);
case GL_DOT4_ATI:
return nir_channel_vec4(t->b, nir_fdot4(t->b,src[0], src[1]), 0);
default:
unreachable("Unknown ATI_fs opcode");
}
}
static nir_ssa_def *
emit_dstmod(struct st_translate *t,
struct nir_ssa_def *dst, GLuint dstMod)
{
switch (dstMod & ~GL_SATURATE_BIT_ATI) {
case GL_2X_BIT_ATI:
dst = nir_fmul_imm(t->b, dst, 2.0f);
break;
case GL_4X_BIT_ATI:
dst = nir_fmul_imm(t->b, dst, 4.0f);
break;
case GL_8X_BIT_ATI:
dst = nir_fmul_imm(t->b, dst, 8.0f);
break;
case GL_HALF_BIT_ATI:
dst = nir_fmul_imm(t->b, dst, 0.5f);
break;
case GL_QUARTER_BIT_ATI:
dst = nir_fmul_imm(t->b, dst, 0.25f);
break;
case GL_EIGHTH_BIT_ATI:
dst = nir_fmul_imm(t->b, dst, 0.125f);
break;
default:
break;
}
if (dstMod & GL_SATURATE_BIT_ATI)
dst = nir_fsat(t->b, dst);
return dst;
}
/**
* Compile one setup instruction to NIR instructions.
*/
static void
compile_setupinst(struct st_translate *t,
const unsigned r,
const struct atifs_setupinst *texinst)
{
if (!texinst->Opcode)
return;
GLuint pass_tex = texinst->src;
nir_ssa_def *coord;
if (pass_tex >= GL_TEXTURE0_ARB && pass_tex <= GL_TEXTURE7_ARB) {
unsigned attr = pass_tex - GL_TEXTURE0_ARB;
coord = load_input(t, VARYING_SLOT_TEX0 + attr);
} else if (pass_tex >= GL_REG_0_ATI && pass_tex <= GL_REG_5_ATI) {
unsigned reg = pass_tex - GL_REG_0_ATI;
/* the frontend already validated that REG is only allowed in second pass */
if (t->regs_written[0][reg]) {
coord = t->temps[reg];
} else {
coord = nir_imm_vec4_float(t->b, 0.0f);
}
} else {
coord = nir_ssa_undef(t->b, 4, 32);
}
coord = apply_swizzle(t, coord, texinst->swizzle);
if (texinst->Opcode == ATI_FRAGMENT_SHADER_SAMPLE_OP) {
nir_variable *tex_var = t->samplers[r];
if (!tex_var) {
bool is_array;
enum glsl_sampler_dim sampler_dim =
_mesa_texture_index_to_sampler_dim(t->key->texture_index[r], &is_array);
const struct glsl_type *sampler_type =
glsl_sampler_type(sampler_dim, false, false, GLSL_TYPE_FLOAT);
tex_var = nir_variable_create(t->b->shader, nir_var_uniform, sampler_type, "tex");
tex_var->data.binding = r;
tex_var->data.explicit_binding = true;
t->samplers[r] = tex_var;
}
nir_deref_instr *tex_deref = nir_build_deref_var(t->b, t->samplers[r]);
nir_tex_instr *tex = nir_tex_instr_create(t->b->shader, 3);
tex->op = nir_texop_tex;
tex->sampler_dim = glsl_get_sampler_dim(tex_var->type);
tex->dest_type = nir_type_float32;
tex->coord_components =
glsl_get_sampler_dim_coordinate_components(tex->sampler_dim);
tex->src[0].src_type = nir_tex_src_texture_deref;
tex->src[0].src = nir_src_for_ssa(&tex_deref->dest.ssa);
tex->src[1].src_type = nir_tex_src_sampler_deref;
tex->src[1].src = nir_src_for_ssa(&tex_deref->dest.ssa);
tex->src[2].src_type = nir_tex_src_coord;
tex->src[2].src =
nir_src_for_ssa(nir_channels(t->b, coord,
(1 << tex->coord_components) - 1));
nir_ssa_dest_init(&tex->instr, &tex->dest, 4, 32, NULL);
nir_builder_instr_insert(t->b, &tex->instr);
t->temps[r] = &tex->dest.ssa;
} else if (texinst->Opcode == ATI_FRAGMENT_SHADER_PASS_OP) {
t->temps[r] = coord;
}
t->regs_written[t->current_pass][r] = true;
}
/**
* Compile one arithmetic operation COLOR&ALPHA pair into NIR instructions.
*/
static void
compile_instruction(struct st_translate *t,
const struct atifs_instruction *inst)
{
unsigned optype;
for (optype = 0; optype < 2; optype++) { /* color, alpha */
unsigned dstreg = inst->DstReg[optype].Index - GL_REG_0_ATI;
if (!inst->Opcode[optype])
continue;
/* Execute the op */
nir_ssa_def *result = emit_arith_inst(t, inst, optype);
result = emit_dstmod(t, result, inst->DstReg[optype].dstMod);
/* Do the writemask */
nir_const_value wrmask[4] = { 0 };
for (int i = 0; i < 4; i++) {
if (inst->DstReg[optype].dstMask & (1 << i))
wrmask[i].b = 1;
}
t->temps[dstreg] = nir_bcsel(t->b,
nir_build_imm(t->b, 4, 1, wrmask),
result,
get_temp(t, dstreg));
t->regs_written[t->current_pass][dstreg] = true;
}
}
/* Creates the uniform variable referencing the ATI_fragment_shader constants
* plus the optimized fog state.
*/
static void
st_atifs_setup_uniforms(struct st_translate *t, struct gl_program *program)
{
const struct glsl_type *type =
glsl_array_type(glsl_vec4_type(), program->Parameters->NumParameters, 0);
t->constants =
nir_variable_create(t->b->shader, nir_var_uniform, type,
"gl_ATI_fragment_shader_constants");
}
/**
* Called when a new variant is needed, we need to translate
* the ATI fragment shader to NIR
*/
nir_shader *
st_translate_atifs_program(struct ati_fragment_shader *atifs,
const struct st_fp_variant_key *key,
struct gl_program *program,
const nir_shader_compiler_options *options)
{
nir_builder b = nir_builder_init_simple_shader(MESA_SHADER_FRAGMENT, options, "ATI_fs");
struct st_translate translate = {
.atifs = atifs,
.b = &b,
.key = key,
};
struct st_translate *t = &translate;
/* Copy the shader_info from the gl_program */
t->b->shader->info = program->info;
nir_shader *s = t->b->shader;
s->info.name = ralloc_asprintf(s, "ATIFS%d", program->Id);
s->info.internal = false;
t->fragcolor = nir_variable_create(b.shader, nir_var_shader_out,
glsl_vec4_type(), "gl_FragColor");
t->fragcolor->data.location = FRAG_RESULT_COLOR;
st_atifs_setup_uniforms(t, program);
/* emit instructions */
for (unsigned pass = 0; pass < atifs->NumPasses; pass++) {
t->current_pass = pass;
for (unsigned r = 0; r < MAX_NUM_FRAGMENT_REGISTERS_ATI; r++) {
struct atifs_setupinst *texinst = &atifs->SetupInst[pass][r];
compile_setupinst(t, r, texinst);
}
for (unsigned i = 0; i < atifs->numArithInstr[pass]; i++) {
struct atifs_instruction *inst = &atifs->Instructions[pass][i];
compile_instruction(t, inst);
}
}
if (t->regs_written[atifs->NumPasses-1][0]) {
nir_ssa_def *color = t->temps[0];
if (key->fog) {
nir_ssa_def *fogc = load_input(t, VARYING_SLOT_FOGC);
nir_ssa_def *params = atifs_load_uniform(t, FOG_PARAMS_UNIFORM);
/* compute the 1 component fog factor f */
nir_ssa_def *f = NULL;
if (key->fog == FOG_LINEAR) {
f = nir_ffma(t->b, fogc,
nir_channel(t->b, params, 0),
nir_channel(t->b, params, 1));
} else if (key->fog == FOG_EXP) {
/* EXP formula: f = exp(-dens * z)
* with optimized parameters:
* f = MUL(fogcoord, oparams.z); f= EX2(-f)
*/
f = nir_fmul(t->b, fogc, nir_channel(t->b, params, 2));
f = nir_fexp2(t->b, nir_fneg(t->b, f));
} else if (key->fog == FOG_EXP2) {
/* EXP2 formula: f = exp(-(dens * z)^2)
* with optimized parameters:
* f = MUL(fogcoord, oparams.w); f=MUL(f, f); f= EX2(-f)
*/
f = nir_fmul(t->b, fogc, nir_channel(t->b, params, 3));
f = nir_fmul(t->b, f, f);
f = nir_fexp2(t->b, nir_fneg(t->b, f));
}
f = nir_fsat(t->b, f);
nir_ssa_def *fog_color = nir_flrp(t->b,
atifs_load_uniform(t, FOG_COLOR_UNIFORM),
color,
f);
color = nir_vec4(t->b,
nir_channel(t->b, fog_color, 0),
nir_channel(t->b, fog_color, 1),
nir_channel(t->b, fog_color, 2),
nir_channel(t->b, color, 3));
}
nir_store_var(t->b, t->fragcolor, color, 0xf);
}
return b.shader;
}
/**
* Called in ProgramStringNotify, we need to fill the metadata of the
* gl_program attached to the ati_fragment_shader
*/
void
st_init_atifs_prog(struct gl_context *ctx, struct gl_program *prog)
{
/* we know this is st_fragment_program, because of st_new_ati_fs() */
struct ati_fragment_shader *atifs = prog->ati_fs;
unsigned pass, i, r, optype, arg;
static const gl_state_index16 fog_params_state[STATE_LENGTH] =
{STATE_FOG_PARAMS_OPTIMIZED, 0, 0};
static const gl_state_index16 fog_color[STATE_LENGTH] =
{STATE_FOG_COLOR, 0, 0, 0};
prog->info.inputs_read = 0;
prog->info.outputs_written = BITFIELD64_BIT(FRAG_RESULT_COLOR);
prog->SamplersUsed = 0;
prog->Parameters = _mesa_new_parameter_list();
/* fill in inputs_read, SamplersUsed, TexturesUsed */
for (pass = 0; pass < atifs->NumPasses; pass++) {
for (r = 0; r < MAX_NUM_FRAGMENT_REGISTERS_ATI; r++) {
struct atifs_setupinst *texinst = &atifs->SetupInst[pass][r];
GLuint pass_tex = texinst->src;
if (texinst->Opcode == ATI_FRAGMENT_SHADER_SAMPLE_OP) {
/* mark which texcoords are used */
prog->info.inputs_read |= BITFIELD64_BIT(VARYING_SLOT_TEX0 + pass_tex - GL_TEXTURE0_ARB);
/* by default there is 1:1 mapping between samplers and textures */
prog->SamplersUsed |= (1 << r);
/* the target is unknown here, it will be fixed in the draw call */
prog->TexturesUsed[r] = TEXTURE_2D_BIT;
} else if (texinst->Opcode == ATI_FRAGMENT_SHADER_PASS_OP) {
if (pass_tex >= GL_TEXTURE0_ARB && pass_tex <= GL_TEXTURE7_ARB) {
prog->info.inputs_read |= BITFIELD64_BIT(VARYING_SLOT_TEX0 + pass_tex - GL_TEXTURE0_ARB);
}
}
}
}
for (pass = 0; pass < atifs->NumPasses; pass++) {
for (i = 0; i < atifs->numArithInstr[pass]; i++) {
struct atifs_instruction *inst = &atifs->Instructions[pass][i];
for (optype = 0; optype < 2; optype++) { /* color, alpha */
if (inst->Opcode[optype]) {
for (arg = 0; arg < inst->ArgCount[optype]; arg++) {
GLint index = inst->SrcReg[optype][arg].Index;
if (index == GL_PRIMARY_COLOR_EXT) {
prog->info.inputs_read |= BITFIELD64_BIT(VARYING_SLOT_COL0);
} else if (index == GL_SECONDARY_INTERPOLATOR_ATI) {
/* note: ATI_fragment_shader.txt never specifies what
* GL_SECONDARY_INTERPOLATOR_ATI is, swrast uses
* VARYING_SLOT_COL1 for this input */
prog->info.inputs_read |= BITFIELD64_BIT(VARYING_SLOT_COL1);
}
}
}
}
}
}
/* we may need fog */
prog->info.inputs_read |= BITFIELD64_BIT(VARYING_SLOT_FOGC);
/* we always have the ATI_fs constants, and the fog params */
for (i = 0; i < MAX_NUM_FRAGMENT_CONSTANTS_ATI; i++) {
_mesa_add_parameter(prog->Parameters, PROGRAM_UNIFORM,
NULL, 4, GL_FLOAT, NULL, NULL, true);
}
ASSERTED uint32_t ref;
ref = _mesa_add_state_reference(prog->Parameters, fog_params_state);
assert(ref == FOG_PARAMS_UNIFORM);
ref = _mesa_add_state_reference(prog->Parameters, fog_color);
assert(ref == FOG_COLOR_UNIFORM);
}
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