mirror of https://gitlab.freedesktop.org/mesa/mesa
67 lines
2.5 KiB
C
67 lines
2.5 KiB
C
/*
|
|
* Copyright 2018-2019 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
|
|
* on the rights to use, copy, modify, merge, publish, distribute, sub
|
|
* license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHOR(S) AND/OR THEIR SUPPLIERS 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_builder.h"
|
|
|
|
static bool
|
|
lower_pos_write(nir_builder *b, nir_intrinsic_instr *intr,
|
|
UNUSED void *cb_data)
|
|
{
|
|
if (intr->intrinsic != nir_intrinsic_store_deref)
|
|
return false;
|
|
|
|
nir_variable *var = nir_intrinsic_get_var(intr, 0);
|
|
if (var->data.mode != nir_var_shader_out ||
|
|
var->data.location != VARYING_SLOT_POS)
|
|
return false;
|
|
|
|
b->cursor = nir_before_instr(&intr->instr);
|
|
|
|
nir_def *pos = intr->src[1].ssa;
|
|
nir_def *def = nir_vec4(b,
|
|
nir_channel(b, pos, 0),
|
|
nir_channel(b, pos, 1),
|
|
nir_fmul_imm(b,
|
|
nir_fadd(b,
|
|
nir_channel(b, pos, 2),
|
|
nir_channel(b, pos, 3)),
|
|
0.5),
|
|
nir_channel(b, pos, 3));
|
|
nir_src_rewrite(intr->src + 1, def);
|
|
return true;
|
|
}
|
|
|
|
void
|
|
nir_lower_clip_halfz(nir_shader *shader)
|
|
{
|
|
if (shader->info.stage != MESA_SHADER_VERTEX &&
|
|
shader->info.stage != MESA_SHADER_GEOMETRY &&
|
|
shader->info.stage != MESA_SHADER_TESS_EVAL)
|
|
return;
|
|
|
|
nir_shader_intrinsics_pass(shader, lower_pos_write,
|
|
nir_metadata_block_index |
|
|
nir_metadata_dominance,
|
|
NULL);
|
|
}
|