src/gallium/drivers/panfrost/nir/nir_clamp_psiz.c

   1 /*
   2  * Copyright (C) 2019 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
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * @file
  26  *
  27  * Clamps writes to VARYING_SLOT_PSIZ to a given limit.
  28  */
  29
  30 #include "compiler/nir/nir.h"
  31 #include "compiler/nir/nir_builder.h"
  32
  33 void
  34 nir_clamp_psiz(nir_shader *shader, float min_size, float max_size);
  35
  36 void
  37 nir_clamp_psiz(nir_shader *shader, float min_size, float max_size)
  38 {
  39    nir_foreach_function(func, shader) {
  40       nir_foreach_block(block, func->impl) {
  41          nir_foreach_instr_safe(instr, block) {
  42             if (instr->type != nir_instr_type_intrinsic)
  43                continue;
  44
  45             nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
  46             if (intr->intrinsic != nir_intrinsic_store_deref)
  47                continue;
  48
  49             nir_variable *var = nir_intrinsic_get_var(intr, 0);
  50             if (var->data.location != VARYING_SLOT_PSIZ)
  51                continue;
  52
  53             nir_builder b;
  54             nir_builder_init(&b, func->impl);
  55             b.cursor = nir_before_instr(instr);
  56
  57             nir_ssa_def *in_size = nir_ssa_for_src(&b, intr->src[1], 1);
  58
  59             nir_ssa_def *clamped =
  60                nir_fmin(&b,
  61                         nir_fmax(&b, in_size, nir_imm_float(&b, min_size)),
  62                         nir_imm_float(&b, max_size));
  63
  64             nir_instr_rewrite_src(instr, &intr->src[1],
  65                                   nir_src_for_ssa(clamped));
  66
  67          }
  68       }
  69
  70       nir_metadata_preserve(func->impl, nir_metadata_block_index |
  71                             nir_metadata_dominance);
  72    }
  73 }
  74