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/*
* Copyright © 2013 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 "brw_compiler.h"
#include "brw_context.h"
#include "compiler/nir/nir.h"
static char const *get_qual_name(int mode)
{
switch (mode) {
case INTERP_MODE_NONE: return "none";
case INTERP_MODE_FLAT: return "flat";
case INTERP_MODE_SMOOTH: return "smooth";
case INTERP_MODE_NOPERSPECTIVE: return "nopersp";
default: return "???";
}
}
static void
gen4_frag_prog_set_interp_modes(struct gen4_fragment_program *prog,
struct brw_vue_map *vue_map,
unsigned location, unsigned slot_count,
enum glsl_interp_mode interp)
{
for (unsigned k = 0; k < slot_count; k++) {
unsigned slot = vue_map->varying_to_slot[location + k];
if (slot != -1 && prog->interp_mode[slot] == INTERP_MODE_NONE) {
prog->interp_mode[slot] = interp;
if (prog->interp_mode[slot] == INTERP_MODE_FLAT) {
prog->contains_flat_varying = true;
} else if (prog->interp_mode[slot] == INTERP_MODE_NOPERSPECTIVE) {
prog->contains_noperspective_varying = true;
}
}
}
}
/* Set up interpolation modes for every element in the VUE */
void
brw_setup_vue_interpolation(struct brw_vue_map *vue_map, nir_shader *nir,
struct gl_program *prog,
const struct gen_device_info *devinfo)
{
struct gen4_fragment_program *fprog = (struct gen4_fragment_program *) prog;
/* Initialise interp_mode. INTERP_MODE_NONE == 0 */
memset(fprog->interp_mode, 0, sizeof(fprog->interp_mode));
if (!vue_map)
return;
/* HPOS always wants noperspective. setting it up here allows
* us to not need special handling in the SF program.
*/
unsigned pos_slot = vue_map->varying_to_slot[VARYING_SLOT_POS];
if (pos_slot != -1) {;
fprog->interp_mode[pos_slot] = INTERP_MODE_NOPERSPECTIVE;
fprog->contains_noperspective_varying = true;
}
foreach_list_typed(nir_variable, var, node, &nir->inputs) {
unsigned location = var->data.location;
unsigned slot_count = glsl_count_attribute_slots(var->type, false);
gen4_frag_prog_set_interp_modes(fprog, vue_map, location, slot_count,
var->data.interpolation);
if (location == VARYING_SLOT_COL0 || location == VARYING_SLOT_COL1) {
location = location + VARYING_SLOT_BFC0 - VARYING_SLOT_COL0;
gen4_frag_prog_set_interp_modes(fprog, vue_map, location,
slot_count, var->data.interpolation);
}
}
bool debug = false;
if (debug) {
fprintf(stderr, "VUE map:\n");
for (int i = 0; i < vue_map->num_slots; i++) {
int varying = vue_map->slot_to_varying[i];
if (varying == -1) {
fprintf(stderr, "%d: --\n", i);
continue;
}
fprintf(stderr, "%d: %d %s ofs %d\n",
i, varying,
get_qual_name(fprog->interp_mode[i]),
brw_vue_slot_to_offset(i));
}
}
}
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