2 * Copyright © 2015 Broadcom
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
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,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
25 * This lowering pass supports (as configured via nir_lower_tex_options)
26 * various texture related conversions:
27 * + texture projector lowering: converts the coordinate division for
28 * texture projection to be done in ALU instructions instead of
29 * asking the texture operation to do so.
30 * + lowering RECT: converts the un-normalized RECT texture coordinates
31 * to normalized coordinates with txs plus ALU instructions
32 * + saturate s/t/r coords: to emulate certain texture clamp/wrap modes,
33 * inserts instructions to clamp specified coordinates to [0.0, 1.0].
34 * Note that this automatically triggers texture projector lowering if
35 * needed, since clamping must happen after projector lowering.
39 #include "nir_builder.h"
42 project_src(nir_builder
*b
, nir_tex_instr
*tex
)
44 /* Find the projector in the srcs list, if present. */
45 int proj_index
= nir_tex_instr_src_index(tex
, nir_tex_src_projector
);
49 b
->cursor
= nir_before_instr(&tex
->instr
);
51 nir_ssa_def
*inv_proj
=
52 nir_frcp(b
, nir_ssa_for_src(b
, tex
->src
[proj_index
].src
, 1));
54 /* Walk through the sources projecting the arguments. */
55 for (unsigned i
= 0; i
< tex
->num_srcs
; i
++) {
56 switch (tex
->src
[i
].src_type
) {
57 case nir_tex_src_coord
:
58 case nir_tex_src_comparator
:
63 nir_ssa_def
*unprojected
=
64 nir_ssa_for_src(b
, tex
->src
[i
].src
, nir_tex_instr_src_size(tex
, i
));
65 nir_ssa_def
*projected
= nir_fmul(b
, unprojected
, inv_proj
);
67 /* Array indices don't get projected, so make an new vector with the
68 * coordinate's array index untouched.
70 if (tex
->is_array
&& tex
->src
[i
].src_type
== nir_tex_src_coord
) {
71 switch (tex
->coord_components
) {
73 projected
= nir_vec4(b
,
74 nir_channel(b
, projected
, 0),
75 nir_channel(b
, projected
, 1),
76 nir_channel(b
, projected
, 2),
77 nir_channel(b
, unprojected
, 3));
80 projected
= nir_vec3(b
,
81 nir_channel(b
, projected
, 0),
82 nir_channel(b
, projected
, 1),
83 nir_channel(b
, unprojected
, 2));
86 projected
= nir_vec2(b
,
87 nir_channel(b
, projected
, 0),
88 nir_channel(b
, unprojected
, 1));
91 unreachable("bad texture coord count for array");
96 nir_instr_rewrite_src(&tex
->instr
,
98 nir_src_for_ssa(projected
));
101 nir_tex_instr_remove_src(tex
, proj_index
);
105 lower_offset(nir_builder
*b
, nir_tex_instr
*tex
)
107 int offset_index
= nir_tex_instr_src_index(tex
, nir_tex_src_offset
);
108 if (offset_index
< 0)
111 int coord_index
= nir_tex_instr_src_index(tex
, nir_tex_src_coord
);
112 assert(coord_index
>= 0);
114 assert(tex
->src
[offset_index
].src
.is_ssa
);
115 assert(tex
->src
[coord_index
].src
.is_ssa
);
116 nir_ssa_def
*offset
= tex
->src
[offset_index
].src
.ssa
;
117 nir_ssa_def
*coord
= tex
->src
[coord_index
].src
.ssa
;
119 b
->cursor
= nir_before_instr(&tex
->instr
);
121 nir_ssa_def
*offset_coord
;
122 if (nir_tex_instr_src_type(tex
, coord_index
) == nir_type_float
) {
123 assert(tex
->sampler_dim
== GLSL_SAMPLER_DIM_RECT
);
124 offset_coord
= nir_fadd(b
, coord
, nir_i2f32(b
, offset
));
126 offset_coord
= nir_iadd(b
, coord
, offset
);
130 /* The offset is not applied to the array index */
131 if (tex
->coord_components
== 2) {
132 offset_coord
= nir_vec2(b
, nir_channel(b
, offset_coord
, 0),
133 nir_channel(b
, coord
, 1));
134 } else if (tex
->coord_components
== 3) {
135 offset_coord
= nir_vec3(b
, nir_channel(b
, offset_coord
, 0),
136 nir_channel(b
, offset_coord
, 1),
137 nir_channel(b
, coord
, 2));
139 unreachable("Invalid number of components");
143 nir_instr_rewrite_src(&tex
->instr
, &tex
->src
[coord_index
].src
,
144 nir_src_for_ssa(offset_coord
));
146 nir_tex_instr_remove_src(tex
, offset_index
);
153 get_texture_size(nir_builder
*b
, nir_tex_instr
*tex
)
155 b
->cursor
= nir_before_instr(&tex
->instr
);
159 txs
= nir_tex_instr_create(b
->shader
, 1);
160 txs
->op
= nir_texop_txs
;
161 txs
->sampler_dim
= tex
->sampler_dim
;
162 txs
->is_array
= tex
->is_array
;
163 txs
->is_shadow
= tex
->is_shadow
;
164 txs
->is_new_style_shadow
= tex
->is_new_style_shadow
;
165 txs
->texture_index
= tex
->texture_index
;
166 txs
->texture
= nir_deref_var_clone(tex
->texture
, txs
);
167 txs
->sampler_index
= tex
->sampler_index
;
168 txs
->sampler
= nir_deref_var_clone(tex
->sampler
, txs
);
169 txs
->dest_type
= nir_type_int
;
171 /* only single src, the lod: */
172 txs
->src
[0].src
= nir_src_for_ssa(nir_imm_int(b
, 0));
173 txs
->src
[0].src_type
= nir_tex_src_lod
;
175 nir_ssa_dest_init(&txs
->instr
, &txs
->dest
,
176 nir_tex_instr_dest_size(txs
), 32, NULL
);
177 nir_builder_instr_insert(b
, &txs
->instr
);
179 return nir_i2f32(b
, &txs
->dest
.ssa
);
183 lower_rect(nir_builder
*b
, nir_tex_instr
*tex
)
185 nir_ssa_def
*txs
= get_texture_size(b
, tex
);
186 nir_ssa_def
*scale
= nir_frcp(b
, txs
);
188 /* Walk through the sources normalizing the requested arguments. */
189 for (unsigned i
= 0; i
< tex
->num_srcs
; i
++) {
190 if (tex
->src
[i
].src_type
!= nir_tex_src_coord
)
193 nir_ssa_def
*coords
=
194 nir_ssa_for_src(b
, tex
->src
[i
].src
, tex
->coord_components
);
195 nir_instr_rewrite_src(&tex
->instr
,
197 nir_src_for_ssa(nir_fmul(b
, coords
, scale
)));
200 tex
->sampler_dim
= GLSL_SAMPLER_DIM_2D
;
204 sample_plane(nir_builder
*b
, nir_tex_instr
*tex
, int plane
)
206 assert(tex
->dest
.is_ssa
);
207 assert(nir_tex_instr_dest_size(tex
) == 4);
208 assert(nir_alu_type_get_base_type(tex
->dest_type
) == nir_type_float
);
209 assert(tex
->op
== nir_texop_tex
);
210 assert(tex
->coord_components
== 2);
212 nir_tex_instr
*plane_tex
= nir_tex_instr_create(b
->shader
, 2);
213 nir_src_copy(&plane_tex
->src
[0].src
, &tex
->src
[0].src
, plane_tex
);
214 plane_tex
->src
[0].src_type
= nir_tex_src_coord
;
215 plane_tex
->src
[1].src
= nir_src_for_ssa(nir_imm_int(b
, plane
));
216 plane_tex
->src
[1].src_type
= nir_tex_src_plane
;
217 plane_tex
->op
= nir_texop_tex
;
218 plane_tex
->sampler_dim
= GLSL_SAMPLER_DIM_2D
;
219 plane_tex
->dest_type
= nir_type_float
;
220 plane_tex
->coord_components
= 2;
222 plane_tex
->texture_index
= tex
->texture_index
;
223 plane_tex
->texture
= nir_deref_var_clone(tex
->texture
, plane_tex
);
224 plane_tex
->sampler_index
= tex
->sampler_index
;
225 plane_tex
->sampler
= nir_deref_var_clone(tex
->sampler
, plane_tex
);
227 nir_ssa_dest_init(&plane_tex
->instr
, &plane_tex
->dest
, 4, 32, NULL
);
229 nir_builder_instr_insert(b
, &plane_tex
->instr
);
231 return &plane_tex
->dest
.ssa
;
235 convert_yuv_to_rgb(nir_builder
*b
, nir_tex_instr
*tex
,
236 nir_ssa_def
*y
, nir_ssa_def
*u
, nir_ssa_def
*v
)
238 nir_const_value m
[3] = {
239 { .f32
= { 1.0f
, 0.0f
, 1.59602678f
, 0.0f
} },
240 { .f32
= { 1.0f
, -0.39176229f
, -0.81296764f
, 0.0f
} },
241 { .f32
= { 1.0f
, 2.01723214f
, 0.0f
, 0.0f
} }
246 nir_fmul(b
, nir_imm_float(b
, 1.16438356f
),
247 nir_fadd(b
, y
, nir_imm_float(b
, -16.0f
/ 255.0f
))),
248 nir_channel(b
, nir_fadd(b
, u
, nir_imm_float(b
, -128.0f
/ 255.0f
)), 0),
249 nir_channel(b
, nir_fadd(b
, v
, nir_imm_float(b
, -128.0f
/ 255.0f
)), 0),
250 nir_imm_float(b
, 0.0));
252 nir_ssa_def
*red
= nir_fdot4(b
, yuv
, nir_build_imm(b
, 4, 32, m
[0]));
253 nir_ssa_def
*green
= nir_fdot4(b
, yuv
, nir_build_imm(b
, 4, 32, m
[1]));
254 nir_ssa_def
*blue
= nir_fdot4(b
, yuv
, nir_build_imm(b
, 4, 32, m
[2]));
256 nir_ssa_def
*result
= nir_vec4(b
, red
, green
, blue
, nir_imm_float(b
, 1.0f
));
258 nir_ssa_def_rewrite_uses(&tex
->dest
.ssa
, nir_src_for_ssa(result
));
262 lower_y_uv_external(nir_builder
*b
, nir_tex_instr
*tex
)
264 b
->cursor
= nir_after_instr(&tex
->instr
);
266 nir_ssa_def
*y
= sample_plane(b
, tex
, 0);
267 nir_ssa_def
*uv
= sample_plane(b
, tex
, 1);
269 convert_yuv_to_rgb(b
, tex
,
270 nir_channel(b
, y
, 0),
271 nir_channel(b
, uv
, 0),
272 nir_channel(b
, uv
, 1));
276 lower_y_u_v_external(nir_builder
*b
, nir_tex_instr
*tex
)
278 b
->cursor
= nir_after_instr(&tex
->instr
);
280 nir_ssa_def
*y
= sample_plane(b
, tex
, 0);
281 nir_ssa_def
*u
= sample_plane(b
, tex
, 1);
282 nir_ssa_def
*v
= sample_plane(b
, tex
, 2);
284 convert_yuv_to_rgb(b
, tex
,
285 nir_channel(b
, y
, 0),
286 nir_channel(b
, u
, 0),
287 nir_channel(b
, v
, 0));
291 lower_yx_xuxv_external(nir_builder
*b
, nir_tex_instr
*tex
)
293 b
->cursor
= nir_after_instr(&tex
->instr
);
295 nir_ssa_def
*y
= sample_plane(b
, tex
, 0);
296 nir_ssa_def
*xuxv
= sample_plane(b
, tex
, 1);
298 convert_yuv_to_rgb(b
, tex
,
299 nir_channel(b
, y
, 0),
300 nir_channel(b
, xuxv
, 1),
301 nir_channel(b
, xuxv
, 3));
305 lower_xy_uxvx_external(nir_builder
*b
, nir_tex_instr
*tex
)
307 b
->cursor
= nir_after_instr(&tex
->instr
);
309 nir_ssa_def
*y
= sample_plane(b
, tex
, 0);
310 nir_ssa_def
*uxvx
= sample_plane(b
, tex
, 1);
312 convert_yuv_to_rgb(b
, tex
,
313 nir_channel(b
, y
, 1),
314 nir_channel(b
, uxvx
, 0),
315 nir_channel(b
, uxvx
, 2));
319 * Emits a textureLod operation used to replace an existing
320 * textureGrad instruction.
323 replace_gradient_with_lod(nir_builder
*b
, nir_ssa_def
*lod
, nir_tex_instr
*tex
)
325 /* We are going to emit a textureLod() with the same parameters except that
326 * we replace ddx/ddy with lod.
328 int num_srcs
= tex
->num_srcs
- 1;
329 nir_tex_instr
*txl
= nir_tex_instr_create(b
->shader
, num_srcs
);
331 txl
->op
= nir_texop_txl
;
332 txl
->sampler_dim
= tex
->sampler_dim
;
333 txl
->texture_index
= tex
->texture_index
;
334 txl
->dest_type
= tex
->dest_type
;
335 txl
->is_array
= tex
->is_array
;
336 txl
->is_shadow
= tex
->is_shadow
;
337 txl
->is_new_style_shadow
= tex
->is_new_style_shadow
;
338 txl
->sampler_index
= tex
->sampler_index
;
339 txl
->texture
= nir_deref_var_clone(tex
->texture
, txl
);
340 txl
->sampler
= nir_deref_var_clone(tex
->sampler
, txl
);
341 txl
->coord_components
= tex
->coord_components
;
343 nir_ssa_dest_init(&txl
->instr
, &txl
->dest
, 4, 32, NULL
);
346 for (int i
= 0; i
< tex
->num_srcs
; i
++) {
347 if (tex
->src
[i
].src_type
== nir_tex_src_ddx
||
348 tex
->src
[i
].src_type
== nir_tex_src_ddy
)
350 nir_src_copy(&txl
->src
[src_num
].src
, &tex
->src
[i
].src
, txl
);
351 txl
->src
[src_num
].src_type
= tex
->src
[i
].src_type
;
355 txl
->src
[src_num
].src
= nir_src_for_ssa(lod
);
356 txl
->src
[src_num
].src_type
= nir_tex_src_lod
;
359 assert(src_num
== num_srcs
);
361 nir_ssa_dest_init(&txl
->instr
, &txl
->dest
,
362 tex
->dest
.ssa
.num_components
, 32, NULL
);
363 nir_builder_instr_insert(b
, &txl
->instr
);
365 nir_ssa_def_rewrite_uses(&tex
->dest
.ssa
, nir_src_for_ssa(&txl
->dest
.ssa
));
367 nir_instr_remove(&tex
->instr
);
371 lower_gradient_cube_map(nir_builder
*b
, nir_tex_instr
*tex
)
373 assert(tex
->sampler_dim
== GLSL_SAMPLER_DIM_CUBE
);
374 assert(tex
->op
== nir_texop_txd
);
375 assert(tex
->dest
.is_ssa
);
377 /* Use textureSize() to get the width and height of LOD 0 */
378 nir_ssa_def
*size
= get_texture_size(b
, tex
);
380 /* Cubemap texture lookups first generate a texture coordinate normalized
381 * to [-1, 1] on the appropiate face. The appropiate face is determined
382 * by which component has largest magnitude and its sign. The texture
383 * coordinate is the quotient of the remaining texture coordinates against
384 * that absolute value of the component of largest magnitude. This
385 * division requires that the computing of the derivative of the texel
386 * coordinate must use the quotient rule. The high level GLSL code is as
391 * vec3 abs_p, Q, dQdx, dQdy;
392 * abs_p = abs(ir->coordinate);
393 * if (abs_p.x >= max(abs_p.y, abs_p.z)) {
394 * Q = ir->coordinate.yzx;
395 * dQdx = ir->lod_info.grad.dPdx.yzx;
396 * dQdy = ir->lod_info.grad.dPdy.yzx;
398 * if (abs_p.y >= max(abs_p.x, abs_p.z)) {
399 * Q = ir->coordinate.xzy;
400 * dQdx = ir->lod_info.grad.dPdx.xzy;
401 * dQdy = ir->lod_info.grad.dPdy.xzy;
403 * if (abs_p.z >= max(abs_p.x, abs_p.y)) {
404 * Q = ir->coordinate;
405 * dQdx = ir->lod_info.grad.dPdx;
406 * dQdy = ir->lod_info.grad.dPdy;
409 * Step 2: use quotient rule to compute derivative. The normalized to
410 * [-1, 1] texel coordinate is given by Q.xy / (sign(Q.z) * Q.z). We are
411 * only concerned with the magnitudes of the derivatives whose values are
412 * not affected by the sign. We drop the sign from the computation.
418 * dx = recip * ( dQdx.xy - Q.xy * (dQdx.z * recip) );
419 * dy = recip * ( dQdy.xy - Q.xy * (dQdy.z * recip) );
421 * Step 3: compute LOD. At this point we have the derivatives of the
422 * texture coordinates normalized to [-1,1]. We take the LOD to be
423 * result = log2(max(sqrt(dot(dx, dx)), sqrt(dy, dy)) * 0.5 * L)
424 * = -1.0 + log2(max(sqrt(dot(dx, dx)), sqrt(dy, dy)) * L)
425 * = -1.0 + log2(sqrt(max(dot(dx, dx), dot(dy,dy))) * L)
426 * = -1.0 + log2(sqrt(L * L * max(dot(dx, dx), dot(dy,dy))))
427 * = -1.0 + 0.5 * log2(L * L * max(dot(dx, dx), dot(dy,dy)))
428 * where L is the dimension of the cubemap. The code is:
431 * M = max(dot(dx, dx), dot(dy, dy));
432 * L = textureSize(sampler, 0).x;
433 * result = -1.0 + 0.5 * log2(L * L * M);
438 tex
->src
[nir_tex_instr_src_index(tex
, nir_tex_src_coord
)].src
.ssa
;
440 /* unmodified dPdx, dPdy values */
442 tex
->src
[nir_tex_instr_src_index(tex
, nir_tex_src_ddx
)].src
.ssa
;
444 tex
->src
[nir_tex_instr_src_index(tex
, nir_tex_src_ddy
)].src
.ssa
;
446 nir_ssa_def
*abs_p
= nir_fabs(b
, p
);
447 nir_ssa_def
*abs_p_x
= nir_channel(b
, abs_p
, 0);
448 nir_ssa_def
*abs_p_y
= nir_channel(b
, abs_p
, 1);
449 nir_ssa_def
*abs_p_z
= nir_channel(b
, abs_p
, 2);
451 /* 1. compute selector */
452 nir_ssa_def
*Q
, *dQdx
, *dQdy
;
454 nir_ssa_def
*cond_z
= nir_fge(b
, abs_p_z
, nir_fmax(b
, abs_p_x
, abs_p_y
));
455 nir_ssa_def
*cond_y
= nir_fge(b
, abs_p_y
, nir_fmax(b
, abs_p_x
, abs_p_z
));
457 unsigned yzx
[4] = { 1, 2, 0, 0 };
458 unsigned xzy
[4] = { 0, 2, 1, 0 };
460 Q
= nir_bcsel(b
, cond_z
,
463 nir_swizzle(b
, p
, xzy
, 3, false),
464 nir_swizzle(b
, p
, yzx
, 3, false)));
466 dQdx
= nir_bcsel(b
, cond_z
,
469 nir_swizzle(b
, dPdx
, xzy
, 3, false),
470 nir_swizzle(b
, dPdx
, yzx
, 3, false)));
472 dQdy
= nir_bcsel(b
, cond_z
,
475 nir_swizzle(b
, dPdy
, xzy
, 3, false),
476 nir_swizzle(b
, dPdy
, yzx
, 3, false)));
478 /* 2. quotient rule */
480 /* tmp = Q.xy * recip;
481 * dx = recip * ( dQdx.xy - (tmp * dQdx.z) );
482 * dy = recip * ( dQdy.xy - (tmp * dQdy.z) );
484 nir_ssa_def
*rcp_Q_z
= nir_frcp(b
, nir_channel(b
, Q
, 2));
486 unsigned xy
[4] = { 0, 1, 0, 0 };
487 nir_ssa_def
*Q_xy
= nir_swizzle(b
, Q
, xy
, 2, false);
488 nir_ssa_def
*tmp
= nir_fmul(b
, Q_xy
, rcp_Q_z
);
490 nir_ssa_def
*dQdx_xy
= nir_swizzle(b
, dQdx
, xy
, 2, false);
491 nir_ssa_def
*dQdx_z
= nir_channel(b
, dQdx
, 2);
493 nir_fmul(b
, rcp_Q_z
, nir_fsub(b
, dQdx_xy
, nir_fmul(b
, tmp
, dQdx_z
)));
495 nir_ssa_def
*dQdy_xy
= nir_swizzle(b
, dQdy
, xy
, 2, false);
496 nir_ssa_def
*dQdy_z
= nir_channel(b
, dQdy
, 2);
498 nir_fmul(b
, rcp_Q_z
, nir_fsub(b
, dQdy_xy
, nir_fmul(b
, tmp
, dQdy_z
)));
500 /* M = max(dot(dx, dx), dot(dy, dy)); */
501 nir_ssa_def
*M
= nir_fmax(b
, nir_fdot(b
, dx
, dx
), nir_fdot(b
, dy
, dy
));
503 /* size has textureSize() of LOD 0 */
504 nir_ssa_def
*L
= nir_channel(b
, size
, 0);
506 /* lod = -1.0 + 0.5 * log2(L * L * M); */
509 nir_imm_float(b
, -1.0f
),
511 nir_imm_float(b
, 0.5f
),
512 nir_flog2(b
, nir_fmul(b
, L
, nir_fmul(b
, L
, M
)))));
514 /* 3. Replace the gradient instruction with an equivalent lod instruction */
515 replace_gradient_with_lod(b
, lod
, tex
);
519 lower_gradient_shadow(nir_builder
*b
, nir_tex_instr
*tex
)
521 assert(tex
->sampler_dim
!= GLSL_SAMPLER_DIM_CUBE
);
522 assert(tex
->is_shadow
);
523 assert(tex
->op
== nir_texop_txd
);
524 assert(tex
->dest
.is_ssa
);
526 /* Use textureSize() to get the width and height of LOD 0 */
527 unsigned component_mask
;
528 switch (tex
->sampler_dim
) {
529 case GLSL_SAMPLER_DIM_3D
:
532 case GLSL_SAMPLER_DIM_1D
:
541 nir_channels(b
, get_texture_size(b
, tex
), component_mask
);
543 /* Scale the gradients by width and height. Effectively, the incoming
544 * gradients are s'(x,y), t'(x,y), and r'(x,y) from equation 3.19 in the
545 * GL 3.0 spec; we want u'(x,y), which is w_t * s'(x,y).
548 tex
->src
[nir_tex_instr_src_index(tex
, nir_tex_src_ddx
)].src
.ssa
;
550 tex
->src
[nir_tex_instr_src_index(tex
, nir_tex_src_ddy
)].src
.ssa
;
552 nir_ssa_def
*dPdx
= nir_fmul(b
, ddx
, size
);
553 nir_ssa_def
*dPdy
= nir_fmul(b
, ddy
, size
);
556 if (dPdx
->num_components
== 1) {
557 rho
= nir_fmax(b
, nir_fabs(b
, dPdx
), nir_fabs(b
, dPdy
));
560 nir_fsqrt(b
, nir_fdot(b
, dPdx
, dPdx
)),
561 nir_fsqrt(b
, nir_fdot(b
, dPdy
, dPdy
)));
564 /* lod = log2(rho). We're ignoring GL state biases for now. */
565 nir_ssa_def
*lod
= nir_flog2(b
, rho
);
567 /* Replace the gradient instruction with an equivalent lod instruction */
568 replace_gradient_with_lod(b
, lod
, tex
);
572 saturate_src(nir_builder
*b
, nir_tex_instr
*tex
, unsigned sat_mask
)
574 b
->cursor
= nir_before_instr(&tex
->instr
);
576 /* Walk through the sources saturating the requested arguments. */
577 for (unsigned i
= 0; i
< tex
->num_srcs
; i
++) {
578 if (tex
->src
[i
].src_type
!= nir_tex_src_coord
)
582 nir_ssa_for_src(b
, tex
->src
[i
].src
, tex
->coord_components
);
584 /* split src into components: */
585 nir_ssa_def
*comp
[4];
587 assume(tex
->coord_components
>= 1);
589 for (unsigned j
= 0; j
< tex
->coord_components
; j
++)
590 comp
[j
] = nir_channel(b
, src
, j
);
592 /* clamp requested components, array index does not get clamped: */
593 unsigned ncomp
= tex
->coord_components
;
597 for (unsigned j
= 0; j
< ncomp
; j
++) {
598 if ((1 << j
) & sat_mask
) {
599 if (tex
->sampler_dim
== GLSL_SAMPLER_DIM_RECT
) {
600 /* non-normalized texture coords, so clamp to texture
601 * size rather than [0.0, 1.0]
603 nir_ssa_def
*txs
= get_texture_size(b
, tex
);
604 comp
[j
] = nir_fmax(b
, comp
[j
], nir_imm_float(b
, 0.0));
605 comp
[j
] = nir_fmin(b
, comp
[j
], nir_channel(b
, txs
, j
));
607 comp
[j
] = nir_fsat(b
, comp
[j
]);
612 /* and move the result back into a single vecN: */
613 src
= nir_vec(b
, comp
, tex
->coord_components
);
615 nir_instr_rewrite_src(&tex
->instr
,
617 nir_src_for_ssa(src
));
622 get_zero_or_one(nir_builder
*b
, nir_alu_type type
, uint8_t swizzle_val
)
626 memset(&v
, 0, sizeof(v
));
628 if (swizzle_val
== 4) {
629 v
.u32
[0] = v
.u32
[1] = v
.u32
[2] = v
.u32
[3] = 0;
631 assert(swizzle_val
== 5);
632 if (type
== nir_type_float
)
633 v
.f32
[0] = v
.f32
[1] = v
.f32
[2] = v
.f32
[3] = 1.0;
635 v
.u32
[0] = v
.u32
[1] = v
.u32
[2] = v
.u32
[3] = 1;
638 return nir_build_imm(b
, 4, 32, v
);
642 swizzle_result(nir_builder
*b
, nir_tex_instr
*tex
, const uint8_t swizzle
[4])
644 assert(tex
->dest
.is_ssa
);
646 b
->cursor
= nir_after_instr(&tex
->instr
);
648 nir_ssa_def
*swizzled
;
649 if (tex
->op
== nir_texop_tg4
) {
650 if (swizzle
[tex
->component
] < 4) {
651 /* This one's easy */
652 tex
->component
= swizzle
[tex
->component
];
655 swizzled
= get_zero_or_one(b
, tex
->dest_type
, swizzle
[tex
->component
]);
658 assert(nir_tex_instr_dest_size(tex
) == 4);
659 if (swizzle
[0] < 4 && swizzle
[1] < 4 &&
660 swizzle
[2] < 4 && swizzle
[3] < 4) {
661 unsigned swiz
[4] = { swizzle
[0], swizzle
[1], swizzle
[2], swizzle
[3] };
662 /* We have no 0s or 1s, just emit a swizzling MOV */
663 swizzled
= nir_swizzle(b
, &tex
->dest
.ssa
, swiz
, 4, false);
665 nir_ssa_def
*srcs
[4];
666 for (unsigned i
= 0; i
< 4; i
++) {
667 if (swizzle
[i
] < 4) {
668 srcs
[i
] = nir_channel(b
, &tex
->dest
.ssa
, swizzle
[i
]);
670 srcs
[i
] = get_zero_or_one(b
, tex
->dest_type
, swizzle
[i
]);
673 swizzled
= nir_vec(b
, srcs
, 4);
677 nir_ssa_def_rewrite_uses_after(&tex
->dest
.ssa
, nir_src_for_ssa(swizzled
),
678 swizzled
->parent_instr
);
682 linearize_srgb_result(nir_builder
*b
, nir_tex_instr
*tex
)
684 assert(tex
->dest
.is_ssa
);
685 assert(nir_tex_instr_dest_size(tex
) == 4);
686 assert(nir_alu_type_get_base_type(tex
->dest_type
) == nir_type_float
);
688 b
->cursor
= nir_after_instr(&tex
->instr
);
690 static const unsigned swiz
[4] = {0, 1, 2, 0};
691 nir_ssa_def
*comp
= nir_swizzle(b
, &tex
->dest
.ssa
, swiz
, 3, true);
694 * (comp <= 0.04045) ?
696 * pow((comp + 0.055) / 1.055, 2.4)
698 nir_ssa_def
*low
= nir_fmul(b
, comp
, nir_imm_float(b
, 1.0 / 12.92));
699 nir_ssa_def
*high
= nir_fpow(b
,
703 nir_imm_float(b
, 0.055)),
704 nir_imm_float(b
, 1.0 / 1.055)),
705 nir_imm_float(b
, 2.4));
706 nir_ssa_def
*cond
= nir_fge(b
, nir_imm_float(b
, 0.04045), comp
);
707 nir_ssa_def
*rgb
= nir_bcsel(b
, cond
, low
, high
);
709 /* alpha is untouched: */
710 nir_ssa_def
*result
= nir_vec4(b
,
711 nir_channel(b
, rgb
, 0),
712 nir_channel(b
, rgb
, 1),
713 nir_channel(b
, rgb
, 2),
714 nir_channel(b
, &tex
->dest
.ssa
, 3));
716 nir_ssa_def_rewrite_uses_after(&tex
->dest
.ssa
, nir_src_for_ssa(result
),
717 result
->parent_instr
);
721 nir_lower_tex_block(nir_block
*block
, nir_builder
*b
,
722 const nir_lower_tex_options
*options
)
724 bool progress
= false;
726 nir_foreach_instr_safe(instr
, block
) {
727 if (instr
->type
!= nir_instr_type_tex
)
730 nir_tex_instr
*tex
= nir_instr_as_tex(instr
);
731 bool lower_txp
= !!(options
->lower_txp
& (1 << tex
->sampler_dim
));
733 /* mask of src coords to saturate (clamp): */
734 unsigned sat_mask
= 0;
736 if ((1 << tex
->sampler_index
) & options
->saturate_r
)
737 sat_mask
|= (1 << 2); /* .z */
738 if ((1 << tex
->sampler_index
) & options
->saturate_t
)
739 sat_mask
|= (1 << 1); /* .y */
740 if ((1 << tex
->sampler_index
) & options
->saturate_s
)
741 sat_mask
|= (1 << 0); /* .x */
743 /* If we are clamping any coords, we must lower projector first
744 * as clamping happens *after* projection:
746 if (lower_txp
|| sat_mask
) {
751 if ((tex
->op
== nir_texop_txf
&& options
->lower_txf_offset
) ||
752 (tex
->sampler_dim
== GLSL_SAMPLER_DIM_RECT
&&
753 options
->lower_rect_offset
)) {
754 progress
= lower_offset(b
, tex
) || progress
;
757 if ((tex
->sampler_dim
== GLSL_SAMPLER_DIM_RECT
) && options
->lower_rect
) {
762 if ((1 << tex
->texture_index
) & options
->lower_y_uv_external
) {
763 lower_y_uv_external(b
, tex
);
767 if ((1 << tex
->texture_index
) & options
->lower_y_u_v_external
) {
768 lower_y_u_v_external(b
, tex
);
772 if ((1 << tex
->texture_index
) & options
->lower_yx_xuxv_external
) {
773 lower_yx_xuxv_external(b
, tex
);
777 if ((1 << tex
->texture_index
) & options
->lower_xy_uxvx_external
) {
778 lower_xy_uxvx_external(b
, tex
);
783 saturate_src(b
, tex
, sat_mask
);
787 if (((1 << tex
->texture_index
) & options
->swizzle_result
) &&
788 !nir_tex_instr_is_query(tex
) &&
789 !(tex
->is_shadow
&& tex
->is_new_style_shadow
)) {
790 swizzle_result(b
, tex
, options
->swizzles
[tex
->texture_index
]);
794 /* should be after swizzle so we know which channels are rgb: */
795 if (((1 << tex
->texture_index
) & options
->lower_srgb
) &&
796 !nir_tex_instr_is_query(tex
) && !tex
->is_shadow
) {
797 linearize_srgb_result(b
, tex
);
801 if (tex
->op
== nir_texop_txd
&&
802 tex
->sampler_dim
== GLSL_SAMPLER_DIM_CUBE
&&
803 (options
->lower_txd_cube_map
||
804 (tex
->is_shadow
&& options
->lower_txd_shadow
))) {
805 lower_gradient_cube_map(b
, tex
);
810 if (tex
->op
== nir_texop_txd
&& options
->lower_txd_shadow
&&
811 tex
->is_shadow
&& tex
->sampler_dim
!= GLSL_SAMPLER_DIM_CUBE
) {
812 lower_gradient_shadow(b
, tex
);
822 nir_lower_tex_impl(nir_function_impl
*impl
,
823 const nir_lower_tex_options
*options
)
825 bool progress
= false;
827 nir_builder_init(&builder
, impl
);
829 nir_foreach_block(block
, impl
) {
830 progress
|= nir_lower_tex_block(block
, &builder
, options
);
833 nir_metadata_preserve(impl
, nir_metadata_block_index
|
834 nir_metadata_dominance
);
839 nir_lower_tex(nir_shader
*shader
, const nir_lower_tex_options
*options
)
841 bool progress
= false;
843 nir_foreach_function(function
, shader
) {
845 progress
|= nir_lower_tex_impl(function
->impl
, options
);