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03e3e65cd4
Allows us to clean up quite a bit. Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10393>
256 lines
11 KiB
C
256 lines
11 KiB
C
/*
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* Copyright (C) 2018-2020 Collabora, Ltd.
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* Copyright (C) 2019-2020 Icecream95
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "pan_ir.h"
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#include "compiler/nir/nir_builder.h"
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/* Midgard can write all of color, depth and stencil in a single writeout
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* operation, so we merge depth/stencil stores with color stores.
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* If there are no color stores, we add a write to the "depth RT".
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*
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* For Bifrost, we want these combined so we can properly order
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* +ZS_EMIT with respect to +ATEST and +BLEND, as well as combining
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* depth/stencil stores into a single +ZS_EMIT op.
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*/
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bool
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pan_nir_lower_zs_store(nir_shader *nir)
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{
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if (nir->info.stage != MESA_SHADER_FRAGMENT)
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return false;
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nir_variable *z_var = NULL, *s_var = NULL;
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nir_foreach_shader_out_variable(var, nir) {
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if (var->data.location == FRAG_RESULT_DEPTH)
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z_var = var;
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else if (var->data.location == FRAG_RESULT_STENCIL)
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s_var = var;
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}
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if (!z_var && !s_var)
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return false;
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bool progress = false;
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nir_foreach_function(function, nir) {
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if (!function->impl) continue;
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nir_intrinsic_instr *z_store = NULL, *s_store = NULL;
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nir_foreach_block(block, function->impl) {
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nir_foreach_instr_safe(instr, block) {
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if (instr->type != nir_instr_type_intrinsic)
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continue;
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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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if (intr->intrinsic != nir_intrinsic_store_output)
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continue;
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if (z_var && nir_intrinsic_base(intr) == z_var->data.driver_location) {
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assert(!z_store);
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z_store = intr;
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}
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if (s_var && nir_intrinsic_base(intr) == s_var->data.driver_location) {
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assert(!s_store);
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s_store = intr;
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}
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}
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}
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if (!z_store && !s_store) continue;
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bool replaced = false;
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nir_foreach_block(block, function->impl) {
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nir_foreach_instr_safe(instr, block) {
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if (instr->type != nir_instr_type_intrinsic)
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continue;
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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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if (intr->intrinsic != nir_intrinsic_store_output)
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continue;
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const nir_variable *var = nir_find_variable_with_driver_location(nir, nir_var_shader_out, nir_intrinsic_base(intr));
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assert(var);
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if (var->data.location < FRAG_RESULT_DATA0)
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continue;
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if (var->data.index)
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continue;
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assert(nir_src_is_const(intr->src[1]) && "no indirect outputs");
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nir_builder b;
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nir_builder_init(&b, function->impl);
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assert(!z_store || z_store->instr.block == instr->block);
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assert(!s_store || s_store->instr.block == instr->block);
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b.cursor = nir_after_block_before_jump(instr->block);
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nir_intrinsic_instr *combined_store;
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combined_store = nir_intrinsic_instr_create(b.shader, nir_intrinsic_store_combined_output_pan);
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combined_store->num_components = intr->src[0].ssa->num_components;
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nir_intrinsic_set_base(combined_store, nir_intrinsic_base(intr));
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nir_intrinsic_set_src_type(combined_store, nir_intrinsic_src_type(intr));
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unsigned writeout = PAN_WRITEOUT_C;
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if (z_store)
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writeout |= PAN_WRITEOUT_Z;
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if (s_store)
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writeout |= PAN_WRITEOUT_S;
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nir_intrinsic_set_component(combined_store, writeout);
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struct nir_ssa_def *zero = nir_imm_int(&b, 0);
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struct nir_ssa_def *src[4] = {
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intr->src[0].ssa,
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intr->src[1].ssa,
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z_store ? z_store->src[0].ssa : zero,
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s_store ? s_store->src[0].ssa : zero,
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};
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for (int i = 0; i < 4; ++i)
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combined_store->src[i] = nir_src_for_ssa(src[i]);
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nir_builder_instr_insert(&b, &combined_store->instr);
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nir_instr_remove(instr);
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replaced = true;
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}
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}
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/* Insert a store to the depth RT (0xff) if needed */
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if (!replaced) {
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nir_builder b;
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nir_builder_init(&b, function->impl);
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nir_block *block = NULL;
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if (z_store && s_store)
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assert(z_store->instr.block == s_store->instr.block);
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if (z_store)
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block = z_store->instr.block;
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else
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block = s_store->instr.block;
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b.cursor = nir_after_block_before_jump(block);
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nir_intrinsic_instr *combined_store;
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combined_store = nir_intrinsic_instr_create(b.shader, nir_intrinsic_store_combined_output_pan);
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combined_store->num_components = 4;
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unsigned base;
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if (z_store)
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base = nir_intrinsic_base(z_store);
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else
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base = nir_intrinsic_base(s_store);
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nir_intrinsic_set_base(combined_store, base);
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nir_intrinsic_set_src_type(combined_store, nir_type_float32);
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unsigned writeout = 0;
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if (z_store)
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writeout |= PAN_WRITEOUT_Z;
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if (s_store)
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writeout |= PAN_WRITEOUT_S;
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nir_intrinsic_set_component(combined_store, writeout);
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struct nir_ssa_def *zero = nir_imm_int(&b, 0);
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struct nir_ssa_def *src[4] = {
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nir_imm_vec4(&b, 0, 0, 0, 0),
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zero,
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z_store ? z_store->src[0].ssa : zero,
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s_store ? s_store->src[0].ssa : zero,
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};
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for (int i = 0; i < 4; ++i)
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combined_store->src[i] = nir_src_for_ssa(src[i]);
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nir_builder_instr_insert(&b, &combined_store->instr);
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}
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if (z_store)
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nir_instr_remove(&z_store->instr);
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if (s_store)
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nir_instr_remove(&s_store->instr);
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nir_metadata_preserve(function->impl, nir_metadata_block_index | nir_metadata_dominance);
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progress = true;
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}
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return progress;
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}
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/* Real writeout stores, which break execution, need to be moved to after
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* dual-source stores, which are just standard register writes. */
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bool
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pan_nir_reorder_writeout(nir_shader *nir)
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{
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bool progress = false;
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nir_foreach_function(function, nir) {
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if (!function->impl) continue;
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nir_foreach_block(block, function->impl) {
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nir_instr *last_writeout = NULL;
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nir_foreach_instr_reverse_safe(instr, block) {
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if (instr->type != nir_instr_type_intrinsic)
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continue;
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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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if (intr->intrinsic != nir_intrinsic_store_output)
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continue;
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const nir_variable *var = nir_find_variable_with_driver_location(nir, nir_var_shader_out, nir_intrinsic_base(intr));
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if (var->data.index) {
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if (!last_writeout)
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last_writeout = instr;
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continue;
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}
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if (!last_writeout)
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continue;
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/* This is a real store, so move it to after dual-source stores */
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exec_node_remove(&instr->node);
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exec_node_insert_after(&last_writeout->node, &instr->node);
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progress = true;
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}
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}
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}
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return progress;
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}
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