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-rw-r--r--src/glsl/nir/nir_lower_tex.c355
1 files changed, 0 insertions, 355 deletions
diff --git a/src/glsl/nir/nir_lower_tex.c b/src/glsl/nir/nir_lower_tex.c
deleted file mode 100644
index ae24fb2..0000000
--- a/src/glsl/nir/nir_lower_tex.c
+++ /dev/null
@@ -1,355 +0,0 @@
-/*
- * Copyright © 2015 Broadcom
- *
- * 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.
- */
-
-/*
- * This lowering pass supports (as configured via nir_lower_tex_options)
- * various texture related conversions:
- * + texture projector lowering: converts the coordinate division for
- * texture projection to be done in ALU instructions instead of
- * asking the texture operation to do so.
- * + lowering RECT: converts the un-normalized RECT texture coordinates
- * to normalized coordinates with txs plus ALU instructions
- * + saturate s/t/r coords: to emulate certain texture clamp/wrap modes,
- * inserts instructions to clamp specified coordinates to [0.0, 1.0].
- * Note that this automatically triggers texture projector lowering if
- * needed, since clamping must happen after projector lowering.
- */
-
-#include "nir.h"
-#include "nir_builder.h"
-
-typedef struct {
- nir_builder b;
- const nir_lower_tex_options *options;
- bool progress;
-} lower_tex_state;
-
-static void
-project_src(nir_builder *b, nir_tex_instr *tex)
-{
- /* Find the projector in the srcs list, if present. */
- unsigned proj_index;
- for (proj_index = 0; proj_index < tex->num_srcs; proj_index++) {
- if (tex->src[proj_index].src_type == nir_tex_src_projector)
- break;
- }
- if (proj_index == tex->num_srcs)
- return;
-
- b->cursor = nir_before_instr(&tex->instr);
-
- nir_ssa_def *inv_proj =
- nir_frcp(b, nir_ssa_for_src(b, tex->src[proj_index].src, 1));
-
- /* Walk through the sources projecting the arguments. */
- for (unsigned i = 0; i < tex->num_srcs; i++) {
- switch (tex->src[i].src_type) {
- case nir_tex_src_coord:
- case nir_tex_src_comparitor:
- break;
- default:
- continue;
- }
- nir_ssa_def *unprojected =
- nir_ssa_for_src(b, tex->src[i].src, nir_tex_instr_src_size(tex, i));
- nir_ssa_def *projected = nir_fmul(b, unprojected, inv_proj);
-
- /* Array indices don't get projected, so make an new vector with the
- * coordinate's array index untouched.
- */
- if (tex->is_array && tex->src[i].src_type == nir_tex_src_coord) {
- switch (tex->coord_components) {
- case 4:
- projected = nir_vec4(b,
- nir_channel(b, projected, 0),
- nir_channel(b, projected, 1),
- nir_channel(b, projected, 2),
- nir_channel(b, unprojected, 3));
- break;
- case 3:
- projected = nir_vec3(b,
- nir_channel(b, projected, 0),
- nir_channel(b, projected, 1),
- nir_channel(b, unprojected, 2));
- break;
- case 2:
- projected = nir_vec2(b,
- nir_channel(b, projected, 0),
- nir_channel(b, unprojected, 1));
- break;
- default:
- unreachable("bad texture coord count for array");
- break;
- }
- }
-
- nir_instr_rewrite_src(&tex->instr,
- &tex->src[i].src,
- nir_src_for_ssa(projected));
- }
-
- /* Now move the later tex sources down the array so that the projector
- * disappears.
- */
- nir_instr_rewrite_src(&tex->instr, &tex->src[proj_index].src,
- NIR_SRC_INIT);
- for (unsigned i = proj_index + 1; i < tex->num_srcs; i++) {
- tex->src[i-1].src_type = tex->src[i].src_type;
- nir_instr_move_src(&tex->instr, &tex->src[i-1].src, &tex->src[i].src);
- }
- tex->num_srcs--;
-}
-
-static nir_ssa_def *
-get_texture_size(nir_builder *b, nir_tex_instr *tex)
-{
- b->cursor = nir_before_instr(&tex->instr);
-
- /* RECT textures should not be array: */
- assert(!tex->is_array);
-
- nir_tex_instr *txs;
-
- txs = nir_tex_instr_create(b->shader, 1);
- txs->op = nir_texop_txs;
- txs->sampler_dim = GLSL_SAMPLER_DIM_RECT;
- txs->sampler_index = tex->sampler_index;
- txs->dest_type = nir_type_int;
-
- /* only single src, the lod: */
- txs->src[0].src = nir_src_for_ssa(nir_imm_int(b, 0));
- txs->src[0].src_type = nir_tex_src_lod;
-
- nir_ssa_dest_init(&txs->instr, &txs->dest, 2, NULL);
- nir_builder_instr_insert(b, &txs->instr);
-
- return nir_i2f(b, &txs->dest.ssa);
-}
-
-static void
-lower_rect(nir_builder *b, nir_tex_instr *tex)
-{
- nir_ssa_def *txs = get_texture_size(b, tex);
- nir_ssa_def *scale = nir_frcp(b, txs);
-
- /* Walk through the sources normalizing the requested arguments. */
- for (unsigned i = 0; i < tex->num_srcs; i++) {
- if (tex->src[i].src_type != nir_tex_src_coord)
- continue;
-
- nir_ssa_def *coords =
- nir_ssa_for_src(b, tex->src[i].src, tex->coord_components);
- nir_instr_rewrite_src(&tex->instr,
- &tex->src[i].src,
- nir_src_for_ssa(nir_fmul(b, coords, scale)));
- }
-
- tex->sampler_dim = GLSL_SAMPLER_DIM_2D;
-}
-
-static void
-saturate_src(nir_builder *b, nir_tex_instr *tex, unsigned sat_mask)
-{
- b->cursor = nir_before_instr(&tex->instr);
-
- /* Walk through the sources saturating the requested arguments. */
- for (unsigned i = 0; i < tex->num_srcs; i++) {
- if (tex->src[i].src_type != nir_tex_src_coord)
- continue;
-
- nir_ssa_def *src =
- nir_ssa_for_src(b, tex->src[i].src, tex->coord_components);
-
- /* split src into components: */
- nir_ssa_def *comp[4];
-
- for (unsigned j = 0; j < tex->coord_components; j++)
- comp[j] = nir_channel(b, src, j);
-
- /* clamp requested components, array index does not get clamped: */
- unsigned ncomp = tex->coord_components;
- if (tex->is_array)
- ncomp--;
-
- for (unsigned j = 0; j < ncomp; j++) {
- if ((1 << j) & sat_mask) {
- if (tex->sampler_dim == GLSL_SAMPLER_DIM_RECT) {
- /* non-normalized texture coords, so clamp to texture
- * size rather than [0.0, 1.0]
- */
- nir_ssa_def *txs = get_texture_size(b, tex);
- comp[j] = nir_fmax(b, comp[j], nir_imm_float(b, 0.0));
- comp[j] = nir_fmin(b, comp[j], nir_channel(b, txs, j));
- } else {
- comp[j] = nir_fsat(b, comp[j]);
- }
- }
- }
-
- /* and move the result back into a single vecN: */
- src = nir_vec(b, comp, tex->coord_components);
-
- nir_instr_rewrite_src(&tex->instr,
- &tex->src[i].src,
- nir_src_for_ssa(src));
- }
-}
-
-static nir_ssa_def *
-get_zero_or_one(nir_builder *b, nir_alu_type type, uint8_t swizzle_val)
-{
- nir_const_value v;
-
- memset(&v, 0, sizeof(v));
-
- if (swizzle_val == 4) {
- v.u[0] = v.u[1] = v.u[2] = v.u[3] = 0;
- } else {
- assert(swizzle_val == 5);
- if (type == nir_type_float)
- v.f[0] = v.f[1] = v.f[2] = v.f[3] = 1.0;
- else
- v.u[0] = v.u[1] = v.u[2] = v.u[3] = 1;
- }
-
- return nir_build_imm(b, 4, v);
-}
-
-static void
-swizzle_result(nir_builder *b, nir_tex_instr *tex, const uint8_t swizzle[4])
-{
- assert(tex->dest.is_ssa);
-
- b->cursor = nir_after_instr(&tex->instr);
-
- nir_ssa_def *swizzled;
- if (tex->op == nir_texop_tg4) {
- if (swizzle[tex->component] < 4) {
- /* This one's easy */
- tex->component = swizzle[tex->component];
- return;
- } else {
- swizzled = get_zero_or_one(b, tex->dest_type, swizzle[tex->component]);
- }
- } else {
- assert(nir_tex_instr_dest_size(tex) == 4);
- if (swizzle[0] < 4 && swizzle[1] < 4 &&
- swizzle[2] < 4 && swizzle[3] < 4) {
- unsigned swiz[4] = { swizzle[0], swizzle[1], swizzle[2], swizzle[3] };
- /* We have no 0's or 1's, just emit a swizzling MOV */
- swizzled = nir_swizzle(b, &tex->dest.ssa, swiz, 4, false);
- } else {
- nir_ssa_def *srcs[4];
- for (unsigned i = 0; i < 4; i++) {
- if (swizzle[i] < 4) {
- srcs[i] = nir_channel(b, &tex->dest.ssa, swizzle[i]);
- } else {
- srcs[i] = get_zero_or_one(b, tex->dest_type, swizzle[i]);
- }
- }
- swizzled = nir_vec(b, srcs, 4);
- }
- }
-
- nir_ssa_def_rewrite_uses_after(&tex->dest.ssa, nir_src_for_ssa(swizzled),
- swizzled->parent_instr);
-}
-
-static bool
-nir_lower_tex_block(nir_block *block, void *void_state)
-{
- lower_tex_state *state = void_state;
- nir_builder *b = &state->b;
-
- nir_foreach_instr_safe(block, instr) {
- if (instr->type != nir_instr_type_tex)
- continue;
-
- nir_tex_instr *tex = nir_instr_as_tex(instr);
- bool lower_txp = !!(state->options->lower_txp & (1 << tex->sampler_dim));
-
- /* mask of src coords to saturate (clamp): */
- unsigned sat_mask = 0;
-
- if ((1 << tex->sampler_index) & state->options->saturate_r)
- sat_mask |= (1 << 2); /* .z */
- if ((1 << tex->sampler_index) & state->options->saturate_t)
- sat_mask |= (1 << 1); /* .y */
- if ((1 << tex->sampler_index) & state->options->saturate_s)
- sat_mask |= (1 << 0); /* .x */
-
- /* If we are clamping any coords, we must lower projector first
- * as clamping happens *after* projection:
- */
- if (lower_txp || sat_mask) {
- project_src(b, tex);
- state->progress = true;
- }
-
- if ((tex->sampler_dim == GLSL_SAMPLER_DIM_RECT) &&
- state->options->lower_rect) {
- lower_rect(b, tex);
- state->progress = true;
- }
-
- if (sat_mask) {
- saturate_src(b, tex, sat_mask);
- state->progress = true;
- }
-
- if (((1 << tex->sampler_index) & state->options->swizzle_result) &&
- !nir_tex_instr_is_query(tex) &&
- !(tex->is_shadow && tex->is_new_style_shadow)) {
- swizzle_result(b, tex, state->options->swizzles[tex->sampler_index]);
- state->progress = true;
- }
- }
-
- return true;
-}
-
-static void
-nir_lower_tex_impl(nir_function_impl *impl, lower_tex_state *state)
-{
- nir_builder_init(&state->b, impl);
-
- nir_foreach_block(impl, nir_lower_tex_block, state);
-
- nir_metadata_preserve(impl, nir_metadata_block_index |
- nir_metadata_dominance);
-}
-
-bool
-nir_lower_tex(nir_shader *shader, const nir_lower_tex_options *options)
-{
- lower_tex_state state;
- state.options = options;
- state.progress = false;
-
- nir_foreach_function(shader, function) {
- if (function->impl)
- nir_lower_tex_impl(function->impl, &state);
- }
-
- return state.progress;
-}
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