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9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 #include "v3d_compiler.h"
25 #include "compiler/nir/nir_builder.h"
27 /** @file v3d_nir_lower_txf_ms.c
29 * V3D's MSAA surfaces are laid out in UIF textures where each pixel is a 2x2
30 * quad in the texture. This pass lowers the txf_ms with a ms_index source to
31 * a plain txf with the sample_index pulling out the correct texel from the
35 #define V3D_MAX_SAMPLES 4
38 v3d_nir_lower_txf_ms_instr(nir_builder
*b
, nir_instr
*in_instr
, void *data
)
40 nir_tex_instr
*instr
= nir_instr_as_tex(in_instr
);
42 b
->cursor
= nir_before_instr(&instr
->instr
);
44 int coord_index
= nir_tex_instr_src_index(instr
, nir_tex_src_coord
);
45 int sample_index
= nir_tex_instr_src_index(instr
, nir_tex_src_ms_index
);
46 nir_ssa_def
*coord
= instr
->src
[coord_index
].src
.ssa
;
47 nir_ssa_def
*sample
= instr
->src
[sample_index
].src
.ssa
;
49 nir_ssa_def
*one
= nir_imm_int(b
, 1);
50 nir_ssa_def
*x
= nir_iadd(b
,
51 nir_ishl(b
, nir_channel(b
, coord
, 0), one
),
52 nir_iand(b
, sample
, one
));
53 nir_ssa_def
*y
= nir_iadd(b
,
54 nir_ishl(b
, nir_channel(b
, coord
, 1), one
),
55 nir_iand(b
, nir_ushr(b
, sample
, one
), one
));
57 coord
= nir_vec3(b
, x
, y
, nir_channel(b
, coord
, 2));
59 coord
= nir_vec2(b
, x
, y
);
61 nir_instr_rewrite_src(&instr
->instr
,
62 &instr
->src
[nir_tex_src_coord
].src
,
63 nir_src_for_ssa(coord
));
64 nir_tex_instr_remove_src(instr
, sample_index
);
65 instr
->op
= nir_texop_txf
;
66 instr
->sampler_dim
= GLSL_SAMPLER_DIM_2D
;
68 return NIR_LOWER_INSTR_PROGRESS
;
72 v3d_nir_lower_txf_ms_filter(const nir_instr
*instr
, const void *data
)
74 return (instr
->type
== nir_instr_type_tex
&&
75 nir_instr_as_tex(instr
)->op
== nir_texop_txf_ms
);
79 v3d_nir_lower_txf_ms(nir_shader
*s
, struct v3d_compile
*c
)
81 nir_shader_lower_instructions(s
,
82 v3d_nir_lower_txf_ms_filter
,
83 v3d_nir_lower_txf_ms_instr
,