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/*
* Copyright (C) 2020 Google, Inc.
*
* 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
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* 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 NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS 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.h"
#include "nir_builder.h"
/* Lower mediump FS outputs to fp16 */
static bool
lower_output_var(nir_shader *nir, int location)
{
nir_foreach_variable (var, &nir->outputs) {
if (var->data.driver_location == location &&
((var->data.precision == GLSL_PRECISION_MEDIUM) ||
(var->data.precision == GLSL_PRECISION_LOW))) {
if (glsl_get_base_type(var->type) == GLSL_TYPE_FLOAT)
var->type = glsl_float16_type(var->type);
return glsl_get_base_type(var->type) == GLSL_TYPE_FLOAT16;
}
}
return false;
}
void
nir_lower_mediump_outputs(nir_shader *nir)
{
nir_function_impl *impl = nir_shader_get_entrypoint(nir);
assert(impl);
/* Get rid of old derefs before we change the types of the variables */
nir_opt_dce(nir);
nir_builder b;
nir_builder_init(&b, impl);
nir_foreach_block_safe (block, impl) {
nir_foreach_instr_safe (instr, block) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
if (intr->intrinsic != nir_intrinsic_store_output)
continue;
if (!lower_output_var(nir, nir_intrinsic_base(intr)))
continue;
b.cursor = nir_before_instr(&intr->instr);
nir_instr_rewrite_src(&intr->instr, &intr->src[0],
nir_src_for_ssa(nir_f2f16(&b, intr->src[0].ssa)));
nir_intrinsic_set_type(intr, nir_type_float16);
}
}
}
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