| /* |
| * Copyright © 2019 Collabora Ltd |
| * |
| * 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.h" |
| #include "nir_builder.h" |
| |
| /** nir_lower_point_size_mov.c |
| * |
| * This pass lowers glPointSize into gl_PointSize, by adding a uniform |
| * and a move from that uniform to VARYING_SLOT_PSIZ. This is useful for |
| * OpenGL ES level hardware that lack constant point-size hardware state. |
| */ |
| |
| static bool |
| lower_impl(nir_function_impl *impl, |
| const gl_state_index16 *pointsize_state_tokens, |
| nir_variable *out) |
| { |
| nir_shader *shader = impl->function->shader; |
| nir_builder b; |
| nir_variable *in; |
| |
| nir_builder_init(&b, impl); |
| b.cursor = nir_before_cf_list(&impl->body); |
| |
| in = nir_variable_create(shader, nir_var_uniform, |
| glsl_float_type(), "gl_PointSizeClampedMESA"); |
| in->num_state_slots = 1; |
| in->state_slots = ralloc_array(in, nir_state_slot, 1); |
| memcpy(in->state_slots[0].tokens, |
| pointsize_state_tokens, |
| sizeof(in->state_slots[0].tokens)); |
| |
| if (!out) { |
| out = nir_variable_create(shader, nir_var_shader_out, |
| glsl_float_type(), "gl_PointSize"); |
| out->data.location = VARYING_SLOT_PSIZ; |
| } |
| |
| nir_copy_var(&b, out, in); |
| |
| nir_metadata_preserve(impl, nir_metadata_block_index | |
| nir_metadata_dominance); |
| return true; |
| } |
| |
| void |
| nir_lower_point_size_mov(nir_shader *shader, |
| const gl_state_index16 *pointsize_state_tokens) |
| { |
| assert(shader->info.stage != MESA_SHADER_FRAGMENT && |
| shader->info.stage != MESA_SHADER_COMPUTE); |
| |
| nir_variable *out = |
| nir_find_variable_with_location(shader, nir_var_shader_out, |
| VARYING_SLOT_PSIZ); |
| |
| lower_impl(nir_shader_get_entrypoint(shader), pointsize_state_tokens, |
| out); |
| } |