nir_shader *
brw_create_nir(struct brw_context *brw,
const struct gl_shader_program *shader_prog,
const struct gl_program *prog,
gl_shader_stage stage,
bool is_scalar)
{
struct gl_context *ctx = &brw->ctx;
const nir_shader_compiler_options *options =
ctx->Const.ShaderCompilerOptions[stage].NirOptions;
bool progress;
nir_shader *nir;
/* First, lower the GLSL IR or Mesa IR to NIR */
if (shader_prog) {
nir = glsl_to_nir(shader_prog, stage, options);
nir_remove_dead_variables(nir, nir_var_shader_in | nir_var_shader_out);
NIR_PASS_V(nir, nir_lower_io_to_temporaries,
nir_shader_get_entrypoint(nir), true, false);
} else {
nir = prog_to_nir(prog, options);
NIR_PASS_V(nir, nir_convert_to_ssa); /* turn registers into SSA */
}
nir_validate_shader(nir);
(void)progress;
nir = brw_preprocess_nir(brw->screen->compiler, nir);
if (stage == MESA_SHADER_FRAGMENT) {
static const struct nir_lower_wpos_ytransform_options wpos_options = {
.state_tokens = {STATE_INTERNAL, STATE_FB_WPOS_Y_TRANSFORM, 0, 0, 0},
.fs_coord_pixel_center_integer = 1,
.fs_coord_origin_upper_left = 1,
};
_mesa_add_state_reference(prog->Parameters,
(gl_state_index *) wpos_options.state_tokens);
NIR_PASS(progress, nir, nir_lower_wpos_ytransform, &wpos_options);
}
NIR_PASS(progress, nir, nir_lower_system_values);
NIR_PASS_V(nir, brw_nir_lower_uniforms, is_scalar);
nir_shader_gather_info(nir, nir_shader_get_entrypoint(nir));
if (shader_prog) {
NIR_PASS_V(nir, nir_lower_samplers, shader_prog);
NIR_PASS_V(nir, nir_lower_atomics, shader_prog);
}
return nir;
}
static nir_shader *
load_glsl(unsigned num_files, char* const* files, gl_shader_stage stage)
{
static const struct standalone_options options = {
.glsl_version = 140,
.do_link = true,
};
struct gl_shader_program *prog;
prog = standalone_compile_shader(&options, num_files, files);
if (!prog)
errx(1, "couldn't parse `%s'", files[0]);
nir_shader *nir = glsl_to_nir(prog, stage, ir3_get_compiler_options());
standalone_compiler_cleanup(prog);
/* required NIR passes: */
/* TODO cmdline args for some of the conditional lowering passes? */
NIR_PASS_V(nir, nir_lower_io_to_temporaries,
nir_shader_get_entrypoint(nir),
true, true);
NIR_PASS_V(nir, nir_lower_global_vars_to_local);
NIR_PASS_V(nir, nir_split_var_copies);
NIR_PASS_V(nir, nir_lower_var_copies);
NIR_PASS_V(nir, nir_split_var_copies);
NIR_PASS_V(nir, nir_lower_var_copies);
NIR_PASS_V(nir, nir_lower_io_types);
// TODO nir_assign_var_locations??
NIR_PASS_V(nir, nir_lower_system_values);
NIR_PASS_V(nir, nir_lower_io, nir_var_all, st_glsl_type_size);
NIR_PASS_V(nir, nir_lower_samplers, prog);
return nir;
}
static int
read_file(const char *filename, void **ptr, size_t *size)
{
int fd, ret;
struct stat st;
*ptr = MAP_FAILED;
fd = open(filename, O_RDONLY);
if (fd == -1) {
warnx("couldn't open `%s'", filename);
return 1;
}
ret = fstat(fd, &st);
if (ret)
errx(1, "couldn't stat `%s'", filename);
*size = st.st_size;
*ptr = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (*ptr == MAP_FAILED)
errx(1, "couldn't map `%s'", filename);
close(fd);
return 0;
}