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/*
* Copyright © Microsoft Corporation
*
* 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.h"
#include "nir_builder.h"
#include "nir_builtin_builder.h"
static bool
nir_lower_tex_shadow_filter(const nir_instr *instr,
UNUSED const void *_options)
{
if (instr->type != nir_instr_type_tex)
return false;
/* To be consistent we also want to lower tex when we lower anything,
* otherwise the differences in evaluating the shadow value might lead
* to artifacts. */
nir_tex_instr *tex = nir_instr_as_tex(instr);
if (tex->op != nir_texop_txb &&
tex->op != nir_texop_txl &&
tex->op != nir_texop_txd &&
tex->op != nir_texop_tex)
return false;
return tex->is_shadow;
}
static const struct glsl_type *
strip_shadow(const struct glsl_type *type)
{
const struct glsl_type *new_type =
glsl_sampler_type(
glsl_get_sampler_dim(type),
false, glsl_sampler_type_is_array(type),
GLSL_TYPE_FLOAT);
return new_type;
}
static const struct glsl_type *
strip_shadow_with_array(const struct glsl_type *type)
{
if (glsl_type_is_array(type))
return glsl_array_type(strip_shadow(glsl_without_array(type)),
glsl_get_length(type), 0);
return strip_shadow(type);
}
typedef struct {
unsigned n_states;
enum compare_func *compare_func;
nir_lower_tex_shadow_swizzle *tex_swizzles;
} sampler_state;
static nir_ssa_def *
nir_lower_tex_shadow_impl(nir_builder *b, nir_instr *instr, void *options)
{
nir_tex_instr *tex = nir_instr_as_tex(instr);
sampler_state *state = (sampler_state *)options;
unsigned num_components = nir_tex_instr_result_size(tex);
b->cursor = nir_after_instr(instr);
tex->is_shadow = false;
int comp_index = nir_tex_instr_src_index(tex, nir_tex_src_comparator);
unsigned sampler_binding = tex->texture_index;
nir_deref_instr *sampler_deref = NULL;
nir_variable *sampler = NULL;
int sampler_index = nir_tex_instr_src_index(tex, nir_tex_src_sampler_deref);
if (sampler_index >= 0) {
sampler_deref = nir_instr_as_deref(tex->src[sampler_index].src.ssa->parent_instr);
sampler = nir_deref_instr_get_variable(sampler_deref);
sampler_binding = sampler ? sampler->data.binding : 0;
}
/* NIR expects a vec4 result from the above texture instructions */
nir_ssa_dest_init(&tex->instr, &tex->dest, 4, 32);
nir_ssa_def *tex_r = nir_channel(b, &tex->dest.ssa, 0);
nir_ssa_def *cmp = tex->src[comp_index].src.ssa;
int proj_index = nir_tex_instr_src_index(tex, nir_tex_src_projector);
if (proj_index >= 0)
cmp = nir_fmul(b, cmp, nir_frcp(b, tex->src[proj_index].src.ssa));
nir_ssa_def * result =
nir_compare_func(b,
sampler_binding < state->n_states ?
state->compare_func[sampler_binding] : COMPARE_FUNC_ALWAYS,
cmp, tex_r);
result = nir_b2f32(b, result);
nir_ssa_def *one = nir_imm_float(b, 1.0);
nir_ssa_def *zero = nir_imm_float(b, 0.0);
nir_ssa_def *lookup[6] = {result, NULL, NULL, NULL, zero, one};
nir_ssa_def *r[4] = { result, result, result, result };
if (sampler_binding < state->n_states) {
r[0] = lookup[state->tex_swizzles[sampler_binding].swizzle_r];
r[1] = lookup[state->tex_swizzles[sampler_binding].swizzle_g];
r[2] = lookup[state->tex_swizzles[sampler_binding].swizzle_b];
r[3] = lookup[state->tex_swizzles[sampler_binding].swizzle_a];
}
result = nir_vec(b, r, num_components);
if (sampler_index >= 0) {
sampler->type = strip_shadow_with_array(sampler->type);
sampler_deref->type = sampler->type;
}
tex->is_shadow = false;
nir_tex_instr_remove_src(tex, comp_index);
return result;
}
bool
nir_lower_tex_shadow(nir_shader *s,
unsigned n_states,
enum compare_func *compare_func,
nir_lower_tex_shadow_swizzle *tex_swizzles)
{
sampler_state state = {n_states, compare_func, tex_swizzles};
bool result =
nir_shader_lower_instructions(s,
nir_lower_tex_shadow_filter,
nir_lower_tex_shadow_impl,
&state);
return result;
}
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