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radeonsi: add si_nir_emit_polygon_stipple

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Ported from si_llvm_emit_polygon_stipple().

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21683>
This commit is contained in:
Qiang Yu 2023-03-03 12:06:16 +08:00 • committed by Marge Bot
parent 223878fbe2
commit b8bd186788
1 changed files with 31 additions and 0 deletions
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31
src/gallium/drivers/radeonsi/si_shader.c
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@ -1943,6 +1943,37 @@ static void si_nir_lower_ps_color_input(nir_shader *nir, struct si_shader *shade
colors);
}
static void si_nir_emit_polygon_stipple(nir_shader *nir, struct si_shader_args *args)
{
nir_function_impl *impl = nir_shader_get_entrypoint(nir);
nir_builder builder;
nir_builder *b = &builder;
nir_builder_init(b, impl);
b->cursor = nir_before_cf_list(&impl->body);
/* Load the buffer descriptor. */
nir_ssa_def *desc =
si_nir_load_internal_binding(b, args, SI_PS_CONST_POLY_STIPPLE, 4);
/* Use the fixed-point gl_FragCoord input.
* Since the stipple pattern is 32x32 and it repeats, just get 5 bits
* per coordinate to get the repeating effect.
*/
nir_ssa_def *pos_x = ac_nir_unpack_arg(b, &args->ac, args->pos_fixed_pt, 0, 5);
nir_ssa_def *pos_y = ac_nir_unpack_arg(b, &args->ac, args->pos_fixed_pt, 16, 5);
nir_ssa_def *zero = nir_imm_int(b, 0);
/* The stipple pattern is 32x32, each row has 32 bits. */
nir_ssa_def *offset = nir_ishl_imm(b, pos_y, 2);
nir_ssa_def *row = nir_load_buffer_amd(b, 1, 32, desc, offset, zero, zero);
nir_ssa_def *bit = nir_ubfe(b, row, pos_x, nir_imm_int(b, 1));
nir_ssa_def *pass = nir_i2b(b, bit);
nir_discard_if(b, nir_inot(b, pass));
}
struct nir_shader *si_get_nir_shader(struct si_shader *shader,
struct si_shader_args *args,
bool *free_nir,