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7d94f2ee49
The hardware needs the layer ID and the viewport index packed together. That consumes an entire varying slot, if we want those available in the frag shader we need a separate slot. Add a pass to insert the extra packed write. Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/*
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* Copyright 2023 Valve Corporation
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* SPDX-License-Identifier: MIT
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*/
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#include "compiler/nir/nir.h"
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#include "compiler/nir/nir_builder.h"
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#include "agx_nir.h"
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void
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agx_nir_lower_layer(nir_shader *s)
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{
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assert(s->info.stage == MESA_SHADER_VERTEX);
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if (!(s->info.outputs_written & (VARYING_BIT_LAYER | VARYING_BIT_VIEWPORT)))
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return;
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/* Writes are in the last block, search */
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nir_function_impl *impl = nir_shader_get_entrypoint(s);
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nir_block *last = nir_impl_last_block(impl);
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nir_def *layer = NULL, *viewport = NULL;
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nir_cursor last_cursor;
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nir_foreach_instr(instr, last) {
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if (instr->type != nir_instr_type_intrinsic)
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continue;
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nir_intrinsic_instr *store = nir_instr_as_intrinsic(instr);
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if (store->intrinsic != nir_intrinsic_store_output)
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continue;
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nir_io_semantics sem = nir_intrinsic_io_semantics(store);
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nir_def *value = store->src[0].ssa;
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if (sem.location == VARYING_SLOT_LAYER) {
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assert(layer == NULL && "only written once");
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layer = value;
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} else if (sem.location == VARYING_SLOT_VIEWPORT) {
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assert(viewport == NULL && "only written once");
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viewport = value;
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} else {
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continue;
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}
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last_cursor = nir_after_instr(&store->instr);
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/* Leave the store as a varying-only, no sysval output */
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sem.no_sysval_output = true;
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nir_intrinsic_set_io_semantics(store, sem);
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}
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assert((layer || viewport) && "metadata inconsistent with program");
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/* Pack together and write out */
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nir_builder b = nir_builder_at(last_cursor);
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nir_def *zero = nir_imm_intN_t(&b, 0, 16);
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nir_def *packed =
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nir_pack_32_2x16_split(&b, layer ? nir_u2u16(&b, layer) : zero,
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viewport ? nir_u2u16(&b, viewport) : zero);
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/* Written with a sysval-only store, no varying output */
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nir_store_output(&b, packed, nir_imm_int(&b, 0),
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.io_semantics.location = VARYING_SLOT_LAYER,
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.io_semantics.num_slots = 1,
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.io_semantics.no_varying = true);
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}
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