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/*
* Copyright © 2015 Red Hat
*
* 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"
typedef struct {
nir_shader *shader;
nir_builder b;
} lower_state;
static bool
is_color_output(lower_state *state, nir_variable *out)
{
switch (state->shader->info.stage) {
case MESA_SHADER_VERTEX:
case MESA_SHADER_GEOMETRY:
case MESA_SHADER_TESS_EVAL:
switch (out->data.location) {
case VARYING_SLOT_COL0:
case VARYING_SLOT_COL1:
case VARYING_SLOT_BFC0:
case VARYING_SLOT_BFC1:
return true;
default:
return false;
}
break;
case MESA_SHADER_FRAGMENT:
return (out->data.location == FRAG_RESULT_COLOR ||
out->data.location >= FRAG_RESULT_DATA0);
default:
return false;
}
}
static bool
lower_intrinsic(lower_state *state, nir_intrinsic_instr *intr)
{
nir_variable *out = NULL;
nir_builder *b = &state->b;
nir_ssa_def *s;
switch (intr->intrinsic) {
case nir_intrinsic_store_deref:
out = nir_deref_instr_get_variable(nir_src_as_deref(intr->src[0]));
break;
case nir_intrinsic_store_output:
/* already had i/o lowered.. lookup the matching output var: */
nir_foreach_variable(var, &state->shader->outputs) {
int drvloc = var->data.driver_location;
if (nir_intrinsic_base(intr) == drvloc) {
out = var;
break;
}
}
assume(out);
break;
default:
return false;
}
if (out->data.mode != nir_var_shader_out)
return false;
if (is_color_output(state, out)) {
b->cursor = nir_before_instr(&intr->instr);
int src = intr->intrinsic == nir_intrinsic_store_deref ? 1 : 0;
s = nir_ssa_for_src(b, intr->src[src], intr->num_components);
s = nir_fsat(b, s);
nir_instr_rewrite_src(&intr->instr, &intr->src[src], nir_src_for_ssa(s));
}
return true;
}
static bool
lower_block(lower_state *state, nir_block *block)
{
bool progress = false;
nir_foreach_instr_safe(instr, block) {
if (instr->type == nir_instr_type_intrinsic)
progress |= lower_intrinsic(state, nir_instr_as_intrinsic(instr));
}
return progress;
}
static bool
lower_impl(lower_state *state, nir_function_impl *impl)
{
nir_builder_init(&state->b, impl);
bool progress = false;
nir_foreach_block(block, impl) {
progress |= lower_block(state, block);
}
nir_metadata_preserve(impl, nir_metadata_block_index |
nir_metadata_dominance);
return progress;
}
bool
nir_lower_clamp_color_outputs(nir_shader *shader)
{
bool progress = false;
lower_state state = {
.shader = shader,
};
nir_foreach_function(function, shader) {
if (function->impl)
progress |= lower_impl(&state, function->impl);
}
return progress;
}
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