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nir: Add option to not lower gl_InstanceIndex

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Signed-off-by: Danylo Piliaiev <dpiliaiev@igalia.com>
Reviewed-by: Emma Anholt <anholt@igalia.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34902>
This commit is contained in:
Danylo Piliaiev 2025-05-13 10:49:45 +02:00 • committed by Marge Bot
parent 0a30611c10
commit 4bc060ea11
2 changed files with 11 additions and 2 deletions
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8
src/compiler/nir/nir_lower_system_values.c
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@ -200,8 +200,12 @@ lower_system_value_instr(nir_builder *b, nir_instr *instr, void *_state)
switch (var->data.location) {
case SYSTEM_VALUE_INSTANCE_INDEX:
return nir_iadd(b, nir_load_instance_id(b),
nir_load_base_instance(b));
if (b->shader->options->instance_id_includes_base_index) {
return nir_load_instance_id(b);
} else {
return nir_iadd(b, nir_load_instance_id(b),
nir_load_base_instance(b));
}
case SYSTEM_VALUE_GLOBAL_INVOCATION_ID: {
return nir_iadd(b, nir_load_global_invocation_id(b, bit_size),

5
src/compiler/nir/nir_shader_compiler_options.h
View file

@ -356,6 +356,11 @@ typedef struct nir_shader_compiler_options {
*/
bool lower_base_vertex;
/* Indicates that gl_InstanceIndex already includes base index
* and doesn't require further lowering.
*/
bool instance_id_includes_base_index;
/**
* If enabled, gl_HelperInvocation will be lowered as:
*