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/*
* Copyright © 2022 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"
/*
* A helper to create a passthrough TCS shader for drivers that cannot handle
* having a TES without TCS.
*
* Uses the load_tess_level_outer_default and load_tess_level_inner_default
* intrinsics to load the gl_TessLevelOuter and gl_TessLevelInner values,
* so driver will somehow need to implement those to load the values set
* by pipe_context::set_tess_state() or similar.
*/
nir_shader *
nir_create_passthrough_tcs_impl(const nir_shader_compiler_options *options,
unsigned *locations, unsigned num_locations,
uint8_t patch_vertices)
{
nir_builder b = nir_builder_init_simple_shader(MESA_SHADER_TESS_CTRL, options,
"tcs passthrough");
nir_variable *in_inner =
nir_create_variable_with_location(b.shader, nir_var_system_value,
SYSTEM_VALUE_TESS_LEVEL_INNER_DEFAULT, glsl_vec_type(2));
nir_variable *out_inner =
nir_create_variable_with_location(b.shader, nir_var_shader_out,
VARYING_SLOT_TESS_LEVEL_INNER, glsl_vec_type(2));
nir_ssa_def *inner = nir_load_var(&b, in_inner);
nir_store_var(&b, out_inner, inner, 0x3);
nir_variable *in_outer =
nir_create_variable_with_location(b.shader, nir_var_system_value,
SYSTEM_VALUE_TESS_LEVEL_OUTER_DEFAULT, glsl_vec4_type());
nir_variable *out_outer =
nir_create_variable_with_location(b.shader, nir_var_shader_out,
VARYING_SLOT_TESS_LEVEL_OUTER, glsl_vec4_type());
nir_ssa_def *outer = nir_load_var(&b, in_outer);
nir_store_var(&b, out_outer, outer, 0xf);
nir_ssa_def *id = nir_load_invocation_id(&b);
for (unsigned i = 0; i < num_locations; i++) {
const struct glsl_type *type;
unsigned semantic = locations[i];
if ((semantic <= VARYING_SLOT_VAR31 && semantic != VARYING_SLOT_EDGE) ||
semantic >= VARYING_SLOT_VAR0_16BIT)
type = glsl_array_type(glsl_vec4_type(), 0, 0);
else
continue;
nir_variable *in = nir_create_variable_with_location(b.shader, nir_var_shader_in,
semantic, type);
nir_variable *out = nir_create_variable_with_location(b.shader, nir_var_shader_out,
semantic, type);
/* no need to use copy_var to save a lower pass */
nir_ssa_def *value = nir_load_array_var(&b, in, id);
nir_store_array_var(&b, out, id, value, 0xf);
}
b.shader->info.tess.tcs_vertices_out = patch_vertices;
nir_validate_shader(b.shader, "in nir_create_passthrough_tcs");
return b.shader;
}
nir_shader *
nir_create_passthrough_tcs(const nir_shader_compiler_options *options,
const nir_shader *vs, uint8_t patch_vertices)
{
unsigned locations[MAX_VARYING];
unsigned num_outputs = 0;
nir_foreach_shader_out_variable (var, vs) {
assert(num_outputs < ARRAY_SIZE(locations));
locations[num_outputs++] = var->data.location;
}
return nir_create_passthrough_tcs_impl(options, locations, num_outputs, patch_vertices);
}
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