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nir: add nir_frag_coord_use_pixel_coord for OpenGL

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Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41461>
This commit is contained in:
Marek Olšák 2026-05-09 18:09:03 -04:00 • committed by Marge Bot
parent 2d8d200c70
commit 63deaf3bfe
2 changed files with 17 additions and 1 deletions
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12
src/compiler/nir/nir_builder.c
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@ -810,7 +810,17 @@ nir_build_frag_coord(nir_builder *b, unsigned num_components)
assert(num_components && num_components <= 4);
if (b->shader->options->frag_coord_form & nir_frag_coord_xy_z_w_separate) {
nir_def *xy = nir_load_frag_coord_xy(b);
nir_def *xy;
if (b->shader->options->frag_coord_form &
nir_frag_coord_use_pixel_coord) {
xy = nir_u2f32(b, nir_load_pixel_coord(b));
if (!b->shader->info.fs.pixel_center_integer)
xy = nir_fadd_imm(b, nir_u2f32(b, nir_load_pixel_coord(b)), 0.5);
} else {
xy = nir_load_frag_coord_xy(b);
}
if (num_components <= 2)
return nir_trim_vector(b, xy, num_components);

6
src/compiler/nir/nir_shader_compiler_options.h
View file

@ -251,6 +251,12 @@ typedef enum {
/* Use frag_coord_w_rcp instead of frag_coord_w. */
nir_frag_coord_use_w_rcp = BITFIELD_BIT(1),
/* Use pixel_coord + (pixel_center_integer ? 0 : 0.5) instead of
* frag_coord_xy. This is always correct for OpenGL without VRS because
* even sample shading must have gl_FragCoord at pixel center.
*/
nir_frag_coord_use_pixel_coord = BITFIELD_BIT(2),
} nir_frag_coord_form;
typedef struct nir_shader_compiler_options {