From: Nicolai Hähnle <nicolai.haeh...@amd.com>
Arguably this could convert to a load intrinsic, but other code paths
already expect this as a fragment shader input.
---
src/compiler/nir/nir_lower_system_values.c | 36
++++++++++++++++++++++++++----
1 file changed, 32 insertions(+), 4 deletions(-)
diff --git a/src/compiler/nir/nir_lower_system_values.c
b/src/compiler/nir/nir_lower_system_values.c
index 810100a..64a1354 100644
--- a/src/compiler/nir/nir_lower_system_values.c
+++ b/src/compiler/nir/nir_lower_system_values.c
@@ -21,22 +21,46 @@
* IN THE SOFTWARE.
*
* Authors:
* Connor Abbott (cwabbo...@gmail.com)
*
*/
#include "nir.h"
#include "nir_builder.h"
+static nir_ssa_def *
+get_frag_coord(nir_builder *b, nir_shader *shader, nir_variable *orig)
+{
+ nir_variable *pos = NULL;
+
+ assert(shader->stage == MESA_SHADER_FRAGMENT);
+
+ nir_foreach_variable(var, &shader->inputs) {
+ if (var->data.location == VARYING_SLOT_POS) {
+ pos = var;
+ break;
+ }
+ }
+
+ if (!pos) {
+ pos = nir_variable_create(shader, nir_var_shader_in,
glsl_vec4_type(), "gl_FragCoord");
+ pos->data.location = VARYING_SLOT_POS;
+ pos->data.pixel_center_integer = orig->data.pixel_center_integer;
+ pos->data.origin_upper_left = orig->data.origin_upper_left;
+ }
+
+ return nir_load_var(b, pos);
+}
+
static bool
-convert_block(nir_block *block, nir_builder *b)
+convert_block(nir_block *block, nir_builder *b, nir_shader *shader)
{
bool progress = false;
nir_foreach_instr_safe(instr, block) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *load_var = nir_instr_as_intrinsic(instr);
if (load_var->intrinsic != nir_intrinsic_load_var)
@@ -109,59 +133,63 @@ convert_block(nir_block *block, nir_builder *b)
sysval = nir_load_vertex_id(b);
}
break;
case SYSTEM_VALUE_INSTANCE_INDEX:
sysval = nir_iadd(b,
nir_load_instance_id(b),
nir_load_base_instance(b));
break;
+ case SYSTEM_VALUE_FRAG_COORD:
+ sysval = get_frag_coord(b, shader, var);
+ break;
+
default:
break;
}
if (sysval == NULL) {
nir_intrinsic_op sysval_op =
nir_intrinsic_from_system_value(var->data.location);
sysval = nir_load_system_value(b, sysval_op, 0);
}
nir_ssa_def_rewrite_uses(&load_var->dest.ssa,
nir_src_for_ssa(sysval));
nir_instr_remove(&load_var->instr);
progress = true;
}
return progress;
}
static bool
-convert_impl(nir_function_impl *impl)
+convert_impl(nir_function_impl *impl, nir_shader *shader)
{
bool progress = false;
nir_builder builder;
nir_builder_init(&builder, impl);
nir_foreach_block(block, impl) {
- progress |= convert_block(block, &builder);
+ progress |= convert_block(block, &builder, shader);
}
nir_metadata_preserve(impl, nir_metadata_block_index |
nir_metadata_dominance);
return progress;
}
bool
nir_lower_system_values(nir_shader *shader)
{
bool progress = false;
nir_foreach_function(function, shader) {
if (function->impl)
- progress = convert_impl(function->impl) || progress;
+ progress = convert_impl(function->impl, shader) || progress;
}
exec_list_make_empty(&shader->system_values);
return progress;
}
