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pan/bi: Add support for writing gl_PrimitiveID from IDVS

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Reviewed-by: Lars-Ivar Hesselberg Simonsen <lars-ivar.simonsen@arm.com>
Reviewed-by: Olivia Lee <olivia.lee@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38504>
This commit is contained in:
Faith Ekstrand 2025-11-19 15:37:59 -05:00 • committed by Marge Bot
parent 5700c87db6
commit 652a5f41bf
2 changed files with 7 additions and 1 deletions
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6
src/panfrost/compiler/bifrost_compile.c
View file

@ -1205,6 +1205,7 @@ va_shader_output_from_semantics(const nir_io_semantics *sem)
return VA_SHADER_OUTPUT_POSITION;
case VARYING_SLOT_PSIZ:
case VARYING_SLOT_LAYER:
case VARYING_SLOT_PRIMITIVE_ID:
return VA_SHADER_OUTPUT_ATTRIB;
default:
return VA_SHADER_OUTPUT_VARY;
@ -1399,6 +1400,11 @@ bi_emit_store_vary(bi_builder *b, nir_intrinsic_instr *instr)
if (sem.location == VARYING_SLOT_PSIZ)
assert(T_size == 16 && "should've been lowered");
if (sem.location == VARYING_SLOT_PRIMITIVE_ID) {
assert(nr == 1 && src_bit_sz == 32);
pos_attr_offset = 12;
}
bool varying = (output_type == VA_SHADER_OUTPUT_VARY);
if (instr->intrinsic == nir_intrinsic_store_per_view_output) {

2
src/panfrost/compiler/bifrost_compile.h
View file

@ -93,7 +93,7 @@ void bifrost_compile_shader_nir(nir_shader *nir,
struct pan_shader_info *info);
#define VALHAL_EX_FIFO_VARYING_BITS \
(VARYING_BIT_PSIZ | VARYING_BIT_LAYER)
(VARYING_BIT_PSIZ | VARYING_BIT_LAYER | VARYING_BIT_PRIMITIVE_ID)
static inline bool
valhal_writes_extended_fifo(uint64_t outputs_written,