diff options
| -rw-r--r-- | src/glsl/Makefile.sources | 1 | ||||
| -rw-r--r-- | src/glsl/nir/nir.h | 2 | ||||
| -rw-r--r-- | src/glsl/nir/nir_normalize_cubemap_coords.c | 110 |
3 files changed, 113 insertions, 0 deletions
diff --git a/src/glsl/Makefile.sources b/src/glsl/Makefile.sources index ffce706fa22..c3b70d4ab35 100644 --- a/src/glsl/Makefile.sources +++ b/src/glsl/Makefile.sources @@ -43,6 +43,7 @@ NIR_FILES = \ nir/nir_lower_var_copies.c \ nir/nir_lower_vec_to_movs.c \ nir/nir_metadata.c \ + nir/nir_normalize_cubemap_coords.c \ nir/nir_opt_constant_folding.c \ nir/nir_opt_copy_propagate.c \ nir/nir_opt_cse.c \ diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h index 0509e64e1e2..199ecc0e3d3 100644 --- a/src/glsl/nir/nir.h +++ b/src/glsl/nir/nir.h @@ -1616,6 +1616,8 @@ void nir_lower_tex_projector(nir_shader *shader); void nir_lower_atomics(nir_shader *shader); void nir_lower_to_source_mods(nir_shader *shader); +void nir_normalize_cubemap_coords(nir_shader *shader); + void nir_live_variables_impl(nir_function_impl *impl); bool nir_ssa_defs_interfere(nir_ssa_def *a, nir_ssa_def *b); diff --git a/src/glsl/nir/nir_normalize_cubemap_coords.c b/src/glsl/nir/nir_normalize_cubemap_coords.c new file mode 100644 index 00000000000..0da8447aca1 --- /dev/null +++ b/src/glsl/nir/nir_normalize_cubemap_coords.c @@ -0,0 +1,110 @@ +/* + * 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. + * + * Authors: + * Jason Ekstrand <[email protected]> + */ + +#include "nir.h" +#include "nir_builder.h" + +/** + * This file implements a NIR lowering pass to perform the normalization of + * the cubemap coordinates to have the largest magnitude component be -1.0 + * or 1.0. This is based on the old GLSL IR based pass by Eric. + */ + +static nir_ssa_def * +channel(nir_builder *b, nir_ssa_def *def, int c) +{ + return nir_swizzle(b, def, (unsigned[4]){c, c, c, c}, 1, false); +} + +static bool +normalize_cubemap_coords_block(nir_block *block, void *void_state) +{ + nir_builder *b = void_state; + + nir_foreach_instr(block, instr) { + if (instr->type != nir_instr_type_tex) + continue; + + nir_tex_instr *tex = nir_instr_as_tex(instr); + if (tex->sampler_dim != GLSL_SAMPLER_DIM_CUBE) + continue; + + nir_builder_insert_before_instr(b, &tex->instr); + + for (unsigned i = 0; i < tex->num_srcs; i++) { + if (tex->src[i].src_type != nir_tex_src_coord) + continue; + + nir_ssa_def *orig_coord = + nir_ssa_for_src(b, tex->src[i].src, nir_tex_instr_src_size(tex, i)); + assert(orig_coord->num_components >= 3); + + nir_ssa_def *abs = nir_fabs(b, orig_coord); + nir_ssa_def *norm = nir_fmax(b, channel(b, abs, 0), + nir_fmax(b, channel(b, abs, 1), + channel(b, abs, 2))); + + nir_ssa_def *normalized = nir_fmul(b, orig_coord, nir_frcp(b, norm)); + + /* Array indices don't have to be normalized, so make a new vector + * with the coordinate's array index untouched. + */ + if (tex->coord_components == 4) { + normalized = nir_vec4(b, + channel(b, normalized, 0), + channel(b, normalized, 1), + channel(b, normalized, 2), + channel(b, orig_coord, 3)); + } + + nir_instr_rewrite_src(&tex->instr, + &tex->src[i].src, + nir_src_for_ssa(normalized)); + } + } + + return true; +} + +static void +normalize_cubemap_coords_impl(nir_function_impl *impl) +{ + nir_builder b; + nir_builder_init(&b, impl); + + nir_foreach_block(impl, normalize_cubemap_coords_block, &b); + + nir_metadata_preserve(impl, nir_metadata_block_index | + nir_metadata_dominance); +} + +void +nir_normalize_cubemap_coords(nir_shader *shader) +{ + nir_foreach_overload(shader, overload) + if (overload->impl) + normalize_cubemap_coords_impl(overload->impl); +} |