116 lines
4.5 KiB
C
116 lines
4.5 KiB
C
/*
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* Copyright © 2019 Collabora Ltd
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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
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "nir.h"
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#include "nir_builder.h"
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/** nir_lower_point_size_mov.c
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*
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* This pass lowers glPointSize into gl_PointSize, by adding a uniform
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* and a move from that uniform to VARYING_SLOT_PSIZ. This is useful for
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* OpenGL ES level hardware that lack constant point-size hardware state.
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*/
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static bool
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lower_impl(nir_function_impl *impl,
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const gl_state_index16 *pointsize_state_tokens,
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nir_variable *out)
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{
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nir_shader *shader = impl->function->shader;
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nir_builder b;
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nir_variable *in, *new_out = NULL;
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nir_builder_init(&b, impl);
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in = nir_variable_create(shader, nir_var_uniform,
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glsl_vec4_type(), "gl_PointSizeClampedMESA");
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in->num_state_slots = 1;
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in->state_slots = ralloc_array(in, nir_state_slot, 1);
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in->state_slots[0].swizzle = BITFIELD_MASK(4);
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memcpy(in->state_slots[0].tokens,
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pointsize_state_tokens,
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sizeof(in->state_slots[0].tokens));
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/* the existing output can't be removed in order to avoid breaking xfb.
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* drivers must check var->data.explicit_location to find the original output
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* and only emit that one for xfb
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*/
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if (!out || out->data.explicit_location) {
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new_out = nir_variable_create(shader, nir_var_shader_out,
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glsl_float_type(), "gl_PointSizeMESA");
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new_out->data.location = VARYING_SLOT_PSIZ;
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}
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if (!out) {
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b.cursor = nir_before_cf_list(&impl->body);
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nir_ssa_def *load = nir_load_var(&b, in);
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load = nir_fclamp(&b, nir_channel(&b, load, 0), nir_channel(&b, load, 1), nir_channel(&b, load, 2));
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nir_store_var(&b, new_out, load, 0x1);
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} else {
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bool found = false;
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nir_foreach_block_safe(block, 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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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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if (intr->intrinsic == nir_intrinsic_store_deref) {
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nir_variable *var = nir_intrinsic_get_var(intr, 0);
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if (var == out) {
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b.cursor = nir_after_instr(instr);
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nir_ssa_def *load = nir_load_var(&b, in);
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load = nir_fclamp(&b, nir_channel(&b, load, 0), nir_channel(&b, load, 1), nir_channel(&b, load, 2));
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nir_store_var(&b, new_out ? new_out : out, load, 0x1);
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found = true;
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}
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}
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}
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}
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}
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if (!found) {
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b.cursor = nir_before_cf_list(&impl->body);
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nir_ssa_def *load = nir_load_var(&b, in);
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load = nir_fclamp(&b, nir_channel(&b, load, 0), nir_channel(&b, load, 1), nir_channel(&b, load, 2));
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nir_store_var(&b, new_out, load, 0x1);
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}
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}
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nir_metadata_preserve(impl, nir_metadata_block_index |
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nir_metadata_dominance);
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return true;
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}
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void
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nir_lower_point_size_mov(nir_shader *shader,
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const gl_state_index16 *pointsize_state_tokens)
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{
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assert(shader->info.stage != MESA_SHADER_FRAGMENT &&
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shader->info.stage != MESA_SHADER_COMPUTE);
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nir_variable *out =
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nir_find_variable_with_location(shader, nir_var_shader_out,
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VARYING_SLOT_PSIZ);
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lower_impl(nir_shader_get_entrypoint(shader), pointsize_state_tokens,
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out);
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}
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