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ir3: Implement ViewIndex for GS

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For GS, the ViewIndex is passed through from the DS/VS in a
similar manner to PrimID.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40153>
This commit is contained in:
Connor Abbott 2026-02-27 18:13:17 -05:00 • committed by Marge Bot
parent 2d4bb4cdc6
commit bc72ef2ee9
1 changed files with 16 additions and 0 deletions
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16
src/freedreno/ir3/ir3_compiler_nir.c
View file

@ -5554,6 +5554,8 @@ emit_instructions(struct ir3_context *ctx)
create_sysval_input(ctx, SYSTEM_VALUE_GS_HEADER_IR3, 0x1);
ctx->primitive_id =
create_sysval_input(ctx, SYSTEM_VALUE_PRIMITIVE_ID, 0x1);
ctx->view_index =
create_sysval_input(ctx, SYSTEM_VALUE_VIEW_INDEX, 0x1);
}
break;
case MESA_SHADER_TESS_CTRL:
@ -5872,6 +5874,18 @@ ir3_compile_shader_nir(struct ir3_compiler *compiler,
outputs_count++;
}
if (so->type == MESA_SHADER_VERTEX && ctx->view_index) {
unsigned n = so->outputs_count++;
so->outputs[n].slot = VARYING_SLOT_VIEW_INDEX;
struct ir3_instruction *out =
ir3_collect(&ctx->build, ctx->view_index);
outputs[outputs_count] = out;
outidxs[outputs_count] = n;
regids[outputs_count] = regid(0, 2);
outputs_count++;
}
if (so->type == MESA_SHADER_VERTEX && ctx->rel_patch_id) {
unsigned n = so->outputs_count++;
so->outputs[n].slot = VARYING_SLOT_REL_PATCH_ID_IR3;
@ -6106,6 +6120,8 @@ ir3_compile_shader_nir(struct ir3_compiler *compiler,
ctx->gs_header->dsts[0]->num = regid(0, 0);
if (ctx->primitive_id)
ctx->primitive_id->dsts[0]->num = regid(0, 1);
if (ctx->view_index)
ctx->view_index->dsts[0]->num = regid(0, 2);
} else if (so->num_sampler_prefetch) {
assert(so->type == MESA_SHADER_FRAGMENT);
int idx = 0;