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/*
* Copyright © 2015 Intel 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
* 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"
/**
* @file
*
* This pass combines clip and cull distance arrays in separate locations and
* colocates them both in VARYING_SLOT_CLIP_DIST0. It does so by maintaining
* two arrays but making them compact and using location_frac to stack them on
* top of each other.
*/
/**
* Get the length of the clip/cull distance array, looking past
* any interface block arrays.
*/
static unsigned
get_unwrapped_array_length(nir_shader *nir, nir_variable *var)
{
if (!var)
return 0;
/* Unwrap GS input and TCS input/output interfaces. We want the
* underlying clip/cull distance array length, not the per-vertex
* array length.
*/
const struct glsl_type *type = var->type;
if (nir_is_per_vertex_io(var, nir->info.stage))
type = glsl_get_array_element(type);
assert(glsl_type_is_array(type));
return glsl_get_length(type);
}
static bool
combine_clip_cull(nir_shader *nir,
struct exec_list *vars,
bool store_info)
{
nir_variable *cull = NULL;
nir_variable *clip = NULL;
nir_foreach_variable(var, vars) {
if (var->data.location == VARYING_SLOT_CLIP_DIST0)
clip = var;
if (var->data.location == VARYING_SLOT_CULL_DIST0)
cull = var;
}
if (!cull && !clip)
return false;
if (!cull && clip) {
/* The GLSL IR lowering pass must have converted these to vectors */
if (!clip->data.compact)
return false;
/* If this pass has already run, don't repeat. We would think that
* the combined clip/cull distance array was clip-only and mess up.
*/
if (clip->data.how_declared == nir_var_hidden)
return false;
}
const unsigned clip_array_size = get_unwrapped_array_length(nir, clip);
const unsigned cull_array_size = get_unwrapped_array_length(nir, cull);
if (store_info) {
nir->info.clip_distance_array_size = clip_array_size;
nir->info.cull_distance_array_size = cull_array_size;
}
if (clip) {
assert(clip->data.compact);
clip->data.how_declared = nir_var_hidden;
}
if (cull) {
assert(cull->data.compact);
cull->data.how_declared = nir_var_hidden;
cull->data.location = VARYING_SLOT_CLIP_DIST0 + clip_array_size / 4;
cull->data.location_frac = clip_array_size % 4;
}
nir_foreach_function(function, nir) {
if (function->impl) {
nir_metadata_preserve(function->impl,
nir_metadata_block_index |
nir_metadata_dominance |
nir_metadata_live_ssa_defs |
nir_metadata_loop_analysis);
}
}
return true;
}
bool
nir_lower_clip_cull_distance_arrays(nir_shader *nir)
{
bool progress = false;
if (nir->info.stage <= MESA_SHADER_GEOMETRY)
progress |= combine_clip_cull(nir, &nir->outputs, true);
if (nir->info.stage > MESA_SHADER_VERTEX)
progress |= combine_clip_cull(nir, &nir->inputs, false);
return progress;
}
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