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program: Extend prog_to_nir handle system values.

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Some drivers, such as radeonsi, use a system value for gl_FragCoord
rather than an input variable.  In this case, our Mesa IR will have
a PROGRAM_SYSTEM_VALUE register, which we need to translate.

This makes prog_to_nir work for Gallium drivers which expose the
PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL capability bit.

Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Kenneth Graunke
2019-01-31 21:52:50 -08:00
parent fa38ca25f6
commit 536abd453b
1 changed files with 30 additions and 0 deletions
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30
src/mesa/program/prog_to_nir.c
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@@ -52,6 +52,7 @@ struct ptn_compile {
nir_variable *parameters;
nir_variable *input_vars[VARYING_SLOT_MAX];
nir_variable *output_vars[VARYING_SLOT_MAX];
nir_variable *sysval_vars[SYSTEM_VALUE_MAX];
nir_variable *sampler_vars[32]; /* matches number of bits in TexSrcUnit */
nir_register **output_regs;
nir_register **temp_regs;
@@ -142,6 +143,15 @@ ptn_get_src(struct ptn_compile *c, const struct prog_src_register *prog_src)
src.src = nir_src_for_ssa(nir_load_var(b, var));
break;
}
case PROGRAM_SYSTEM_VALUE: {
assert(!prog_src->RelAddr);
assert(prog_src->Index >= 0 && prog_src->Index < SYSTEM_VALUE_MAX);
nir_variable *var = c->sysval_vars[prog_src->Index];
src.src = nir_src_for_ssa(nir_load_var(b, var));
break;
}
case PROGRAM_STATE_VAR:
case PROGRAM_CONSTANT: {
/* We actually want to look at the type in the Parameters list for this,
@@ -902,6 +912,26 @@ setup_registers_and_variables(struct ptn_compile *c)
c->input_vars[i] = var;
}
/* Create system value variables */
uint64_t system_values_read = c->prog->info.system_values_read;
while (system_values_read) {
const int i = u_bit_scan64(&system_values_read);
nir_variable *var =
nir_variable_create(shader, nir_var_system_value, glsl_vec4_type(),
ralloc_asprintf(shader, "sv_%d", i));
var->data.location = i;
var->data.index = 0;
if (c->prog->Target == GL_FRAGMENT_PROGRAM_ARB &&
i == SYSTEM_VALUE_FRAG_COORD) {
var->data.origin_upper_left = c->prog->OriginUpperLeft;
var->data.pixel_center_integer = c->prog->PixelCenterInteger;
}
c->sysval_vars[i] = var;
}
/* Create output registers and variables. */
int max_outputs = util_last_bit(c->prog->info.outputs_written);
c->output_regs = rzalloc_array(c, nir_register *, max_outputs);