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      1 /*
      2  * Copyright  2015 Red Hat
      3  *
      4  * Permission is hereby granted, free of charge, to any person obtaining a
      5  * copy of this software and associated documentation files (the "Software"),
      6  * to deal in the Software without restriction, including without limitation
      7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8  * and/or sell copies of the Software, and to permit persons to whom the
      9  * Software is furnished to do so, subject to the following conditions:
     10  *
     11  * The above copyright notice and this permission notice (including the next
     12  * paragraph) shall be included in all copies or substantial portions of the
     13  * Software.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     21  * SOFTWARE.
     22  */
     23 
     24 #include "nir.h"
     25 #include "nir_builder.h"
     26 
     27 static void
     28 lower_impl(nir_function_impl *impl)
     29 {
     30    nir_shader *shader = impl->function->shader;
     31    nir_builder b;
     32    nir_variable *in, *out;
     33    nir_ssa_def *def;
     34 
     35    nir_builder_init(&b, impl);
     36    b.cursor = nir_before_cf_list(&impl->body);
     37 
     38    in  = nir_variable_create(shader, nir_var_shader_in,
     39                              glsl_vec4_type(), "edgeflag_in");
     40    in->data.location = VERT_ATTRIB_EDGEFLAG;
     41 
     42    out = nir_variable_create(shader, nir_var_shader_out,
     43                              glsl_vec4_type(), "edgeflag_out");
     44    out->data.location = VARYING_SLOT_EDGE;
     45 
     46    def = nir_load_var(&b, in);
     47    nir_store_var(&b, out, def, 0xf);
     48 
     49    nir_metadata_preserve(impl, nir_metadata_block_index |
     50                                nir_metadata_dominance);
     51 }
     52 
     53 void nir_lower_passthrough_edgeflags(nir_shader *shader)
     54 {
     55    lower_impl(nir_shader_get_entrypoint(shader));
     56 }
     57