108 lines
4.2 KiB
C
108 lines
4.2 KiB
C
/*
|
|
* Copyright © 2020 Mike Blumenkrantz
|
|
*
|
|
* 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.
|
|
*
|
|
* Authors:
|
|
* Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
|
|
*/
|
|
|
|
#include "nir.h"
|
|
#include "nir_builder.h"
|
|
|
|
/**
|
|
* This pass splits gl_FragColor into gl_FragData[0-7] for drivers which handle
|
|
* the former but not the latter, e.g., zink.
|
|
*/
|
|
|
|
/*
|
|
If a fragment shader writes to "gl_FragColor", DrawBuffersIndexedEXT
|
|
specifies a set of draw buffers into which the color written to
|
|
"gl_FragColor" is written. If a fragment shader writes to
|
|
gl_FragData, DrawBuffersIndexedEXT specifies a set of draw buffers
|
|
into which each of the multiple output colors defined by these
|
|
variables are separately written. If a fragment shader writes to
|
|
neither gl_FragColor nor gl_FragData, the values of the fragment
|
|
colors following shader execution are undefined, and may differ
|
|
for each fragment color.
|
|
|
|
- EXT_multiview_draw_buffers
|
|
|
|
*/
|
|
|
|
static bool
|
|
lower_fragcolor_instr(nir_builder *b, nir_instr *intr, void *data)
|
|
{
|
|
if (intr->type != nir_instr_type_intrinsic)
|
|
return false;
|
|
|
|
nir_intrinsic_instr *instr = nir_instr_as_intrinsic(intr);
|
|
unsigned *max_draw_buffers = data;
|
|
|
|
nir_variable *out;
|
|
if (instr->intrinsic != nir_intrinsic_store_deref)
|
|
return false;
|
|
|
|
out = nir_deref_instr_get_variable(nir_src_as_deref(instr->src[0]));
|
|
if (out->data.location != FRAG_RESULT_COLOR || out->data.mode != nir_var_shader_out)
|
|
return false;
|
|
b->cursor = nir_after_instr(&instr->instr);
|
|
|
|
assert(instr->src[1].is_ssa);
|
|
nir_ssa_def *frag_color = instr->src[1].ssa;
|
|
ralloc_free(out->name);
|
|
|
|
const char *name = out->data.index == 0 ? "gl_FragData[0]" :
|
|
"gl_SecondaryFragDataEXT[0]";
|
|
const char *name_tmpl = out->data.index == 0 ? "gl_FragData[%u]" :
|
|
"gl_SecondaryFragDataEXT[%u]";
|
|
|
|
out->name = ralloc_strdup(out, name);
|
|
|
|
/* translate gl_FragColor -> gl_FragData since this is already handled */
|
|
out->data.location = FRAG_RESULT_DATA0;
|
|
nir_component_mask_t writemask = nir_intrinsic_write_mask(instr);
|
|
b->shader->info.outputs_written &= ~BITFIELD64_BIT(FRAG_RESULT_COLOR);
|
|
b->shader->info.outputs_written |= BITFIELD64_BIT(FRAG_RESULT_DATA0);
|
|
|
|
for (unsigned i = 1; i < *max_draw_buffers; i++) {
|
|
char name[28];
|
|
snprintf(name, sizeof(name), name_tmpl, i);
|
|
nir_variable *out_color = nir_variable_create(b->shader, nir_var_shader_out,
|
|
out->type, name);
|
|
out_color->data.location = FRAG_RESULT_DATA0 + i;
|
|
out_color->data.driver_location = b->shader->num_outputs++;
|
|
out_color->data.index = out->data.index;
|
|
nir_store_var(b, out_color, frag_color, writemask);
|
|
b->shader->info.outputs_written |= BITFIELD64_BIT(FRAG_RESULT_DATA0 + i);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
nir_lower_fragcolor(nir_shader *shader, unsigned max_draw_buffers)
|
|
{
|
|
if (shader->info.stage != MESA_SHADER_FRAGMENT)
|
|
return false;
|
|
|
|
return nir_shader_instructions_pass(shader, lower_fragcolor_instr,
|
|
nir_metadata_block_index | nir_metadata_dominance, &max_draw_buffers);
|
|
}
|