137 lines
4.9 KiB
C
137 lines
4.9 KiB
C
/*
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* Copyright © 2020 Igalia S.L.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "nir.h"
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#include "nir_builder.h"
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#include "program/prog_instruction.h"
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/* Lower gl_PointCoord to account for user requested point-coord origin
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* and for whether draw buffer is flipped.
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*/
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typedef struct {
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const gl_state_index16 *pntc_state_tokens;
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nir_shader *shader;
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nir_builder b;
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nir_variable *pntc_transform;
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} lower_pntc_ytransform_state;
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static nir_ssa_def *
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get_pntc_transform(lower_pntc_ytransform_state *state)
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{
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if (state->pntc_transform == NULL) {
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/* NOTE: name must be prefixed w/ "gl_" to trigger slot based
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* special handling in uniform setup:
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*/
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nir_variable *var = nir_variable_create(state->shader,
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nir_var_uniform,
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glsl_vec4_type(),
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"gl_PntcYTransform");
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var->num_state_slots = 1;
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var->state_slots = ralloc_array(var, nir_state_slot, 1);
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var->state_slots[0].swizzle = SWIZZLE_XYZW;
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memcpy(var->state_slots[0].tokens, state->pntc_state_tokens,
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sizeof(var->state_slots[0].tokens));
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var->data.how_declared = nir_var_hidden;
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state->pntc_transform = var;
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}
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return nir_load_var(&state->b, state->pntc_transform);
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}
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static void
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lower_load_pointcoord(lower_pntc_ytransform_state *state,
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nir_intrinsic_instr *intr)
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{
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nir_builder *b = &state->b;
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b->cursor = nir_after_instr(&intr->instr);
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nir_ssa_def *pntc = &intr->dest.ssa;
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nir_ssa_def *transform = get_pntc_transform(state);
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nir_ssa_def *y = nir_channel(b, pntc, 1);
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/* The offset is 1 if we're flipping, 0 otherwise. */
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nir_ssa_def *offset = nir_channel(b, transform, 1);
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/* Flip the sign of y if we're flipping. */
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nir_ssa_def *scaled = nir_fmul(b, y, nir_channel(b, transform, 0));
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/* Reassemble the vector. */
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nir_ssa_def *flipped_pntc = nir_vec2(b,
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nir_channel(b, pntc, 0),
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nir_fadd(b, offset, scaled));
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nir_ssa_def_rewrite_uses_after(&intr->dest.ssa, flipped_pntc,
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flipped_pntc->parent_instr);
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}
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static void
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lower_pntc_ytransform_block(lower_pntc_ytransform_state *state,
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nir_block *block)
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{
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nir_foreach_instr_safe(instr, block) {
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if (instr->type == nir_instr_type_intrinsic) {
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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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if (intr->intrinsic == nir_intrinsic_load_deref) {
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nir_deref_instr *deref = nir_src_as_deref(intr->src[0]);
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nir_variable *var = nir_deref_instr_get_variable(deref);
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if ((var->data.mode == nir_var_shader_in &&
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var->data.location == VARYING_SLOT_PNTC) ||
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(var->data.mode == nir_var_system_value &&
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var->data.location == SYSTEM_VALUE_POINT_COORD)) {
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lower_load_pointcoord(state, intr);
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}
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}
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}
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}
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}
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bool
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nir_lower_pntc_ytransform(nir_shader *shader,
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const gl_state_index16 pntc_state_tokens[][STATE_LENGTH])
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{
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if (!shader->options->lower_wpos_pntc)
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return false;
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lower_pntc_ytransform_state state = {
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.pntc_state_tokens = *pntc_state_tokens,
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.shader = shader,
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.pntc_transform = NULL,
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};
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assert(shader->info.stage == MESA_SHADER_FRAGMENT);
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nir_foreach_function(function, shader) {
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if (function->impl) {
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nir_builder_init(&state.b, function->impl);
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nir_foreach_block(block, function->impl) {
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lower_pntc_ytransform_block(&state, block);
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}
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nir_metadata_preserve(function->impl, nir_metadata_block_index |
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nir_metadata_dominance);
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}
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}
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return state.pntc_transform != NULL;
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}
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