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      1 /*
      2  * Copyright (C) 2021 Collabora, Ltd.
      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 "pan_ir.h"
     25 #include "compiler/nir/nir_builder.h"
     26 
     27 /* Lower gl_HelperInvocation to (gl_SampleMaskIn == 0), this depends on
     28  * architectural details but is required for correct operation with
     29  * multisampling. NIR's lowering won't work for us, since there is no in-spec
     30  * way to implement load_sample_id_no_per_sample. */
     31 
     32 static bool
     33 pan_lower_helper_invocation_instr(nir_builder *b, nir_instr *instr, void *data)
     34 {
     35         if (instr->type != nir_instr_type_intrinsic)
     36                 return false;
     37 
     38         nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
     39         if (intr->intrinsic != nir_intrinsic_load_helper_invocation)
     40                 return false;
     41 
     42         b->cursor = nir_before_instr(instr);
     43 
     44         nir_ssa_def *mask = nir_load_sample_mask_in(b);
     45         nir_ssa_def *eq = nir_ieq(b, mask, nir_imm_int(b, 0));
     46         nir_ssa_def_rewrite_uses(&intr->dest.ssa, eq);
     47 
     48         return true;
     49 }
     50 
     51 bool
     52 pan_lower_helper_invocation(nir_shader *shader)
     53 {
     54         return nir_shader_instructions_pass(shader,
     55                                             pan_lower_helper_invocation_instr,
     56                                             nir_metadata_block_index | nir_metadata_dominance,
     57                                             NULL);
     58 }
     59