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/*
* 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;
}
bool
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 false;
return nir_shader_intrinsics_pass(shader, lower_pos_write,
nir_metadata_control_flow,
NULL);
}
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