| /* |
| * Copyright © 2016 Intel Corporation |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| * IN THE SOFTWARE. |
| */ |
| |
| #include "nir_builder.h" |
| #include "program/prog_instruction.h" |
| |
| static nir_variable * |
| make_uniform(nir_shader *nir, const gl_state_index16 *tokens) |
| { |
| /* Note: name must be prefixed with "gl_" to trigger slot based |
| * special handling in uniform setup. |
| */ |
| nir_variable *var = |
| nir_variable_create(nir, nir_var_uniform, glsl_int_type(), |
| "gl_PatchVerticesIn"); |
| var->num_state_slots = 1; |
| var->state_slots = ralloc_array(var, nir_state_slot, var->num_state_slots); |
| memcpy(var->state_slots[0].tokens, tokens, sizeof(*tokens) * STATE_LENGTH); |
| var->state_slots[0].swizzle = SWIZZLE_XXXX; |
| |
| return var; |
| } |
| |
| /** |
| * This pass lowers the load_patch_vertices_in intrinsic. |
| * |
| * - If we statically know the value, we lower it to a constant. |
| * (If a TES is linked against a TCS, the TCS tells us the TES input count.) |
| * |
| * - If not, and we're given Mesa state slots, we lower it to a uniform. |
| * |
| * - Otherwise, we leave it as a system value. |
| * |
| * This pass must be run after nir_lower_system_values(). |
| */ |
| bool |
| nir_lower_patch_vertices(nir_shader *nir, |
| unsigned static_count, |
| const gl_state_index16 *uniform_state_tokens) |
| { |
| bool progress = false; |
| nir_variable *var = NULL; |
| |
| /* If there's no static count and we don't want uniforms, there's no |
| * lowering to do...just bail early. |
| */ |
| if (static_count == 0 && !uniform_state_tokens) |
| return false; |
| |
| nir_foreach_function(function, nir) { |
| if (function->impl) { |
| nir_foreach_block(block, function->impl) { |
| nir_builder b; |
| nir_builder_init(&b, function->impl); |
| nir_foreach_instr_safe(instr, block) { |
| if (instr->type == nir_instr_type_intrinsic) { |
| nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr); |
| if (intr->intrinsic != nir_intrinsic_load_patch_vertices_in) |
| continue; |
| |
| b.cursor = nir_before_instr(&intr->instr); |
| |
| nir_ssa_def *val = NULL; |
| if (static_count) { |
| val = nir_imm_int(&b, static_count); |
| } else { |
| if (!var) |
| var = make_uniform(nir, uniform_state_tokens); |
| |
| val = nir_load_var(&b, var); |
| } |
| |
| progress = true; |
| nir_ssa_def_rewrite_uses(&intr->dest.ssa, |
| nir_src_for_ssa(val)); |
| nir_instr_remove(instr); |
| } |
| } |
| } |
| |
| if (progress) { |
| nir_metadata_preserve(function->impl, nir_metadata_block_index | |
| nir_metadata_dominance); |
| } |
| } |
| } |
| |
| return progress; |
| } |