2 * Copyright © 2012 Intel Corporation
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
24 #include "main/context.h"
25 #include "main/teximage.h"
26 #include "main/fbobject.h"
28 #include "intel_fbo.h"
30 #include "brw_blorp.h"
31 #include "brw_context.h"
32 #include "brw_blorp_blit_eu.h"
33 #include "brw_state.h"
34 #include "brw_meta_util.h"
36 #define FILE_DEBUG_FLAG DEBUG_BLORP
38 static struct intel_mipmap_tree
*
39 find_miptree(GLbitfield buffer_bit
, struct intel_renderbuffer
*irb
)
41 struct intel_mipmap_tree
*mt
= irb
->mt
;
42 if (buffer_bit
== GL_STENCIL_BUFFER_BIT
&& mt
->stencil_mt
)
49 * Note: if the src (or dst) is a 2D multisample array texture on Gen7+ using
50 * INTEL_MSAA_LAYOUT_UMS or INTEL_MSAA_LAYOUT_CMS, src_layer (dst_layer) is
51 * the physical layer holding sample 0. So, for example, if
52 * src_mt->num_samples == 4, then logical layer n corresponds to src_layer ==
56 brw_blorp_blit_miptrees(struct brw_context
*brw
,
57 struct intel_mipmap_tree
*src_mt
,
58 unsigned src_level
, unsigned src_layer
,
59 mesa_format src_format
,
60 struct intel_mipmap_tree
*dst_mt
,
61 unsigned dst_level
, unsigned dst_layer
,
62 mesa_format dst_format
,
63 float src_x0
, float src_y0
,
64 float src_x1
, float src_y1
,
65 float dst_x0
, float dst_y0
,
66 float dst_x1
, float dst_y1
,
67 GLenum filter
, bool mirror_x
, bool mirror_y
,
68 bool decode_srgb
, bool encode_srgb
)
70 /* Get ready to blit. This includes depth resolving the src and dst
71 * buffers if necessary. Note: it's not necessary to do a color resolve on
72 * the destination buffer because we use the standard render path to render
73 * to destination color buffers, and the standard render path is
75 * Lossless compression is only introduced for gen9 onwards whereas
76 * blorp is not supported even for gen8. Therefore it should be impossible
77 * to end up here with single sampled compressed surfaces.
79 assert(!intel_miptree_is_lossless_compressed(brw
, src_mt
));
80 assert(!intel_miptree_is_lossless_compressed(brw
, dst_mt
));
81 intel_miptree_resolve_color(brw
, src_mt
, 0);
82 intel_miptree_slice_resolve_depth(brw
, src_mt
, src_level
, src_layer
);
83 intel_miptree_slice_resolve_depth(brw
, dst_mt
, dst_level
, dst_layer
);
85 DBG("%s from %dx %s mt %p %d %d (%f,%f) (%f,%f)"
86 "to %dx %s mt %p %d %d (%f,%f) (%f,%f) (flip %d,%d)\n",
88 src_mt
->num_samples
, _mesa_get_format_name(src_mt
->format
), src_mt
,
89 src_level
, src_layer
, src_x0
, src_y0
, src_x1
, src_y1
,
90 dst_mt
->num_samples
, _mesa_get_format_name(dst_mt
->format
), dst_mt
,
91 dst_level
, dst_layer
, dst_x0
, dst_y0
, dst_x1
, dst_y1
,
94 if (!decode_srgb
&& _mesa_get_format_color_encoding(src_format
) == GL_SRGB
)
95 src_format
= _mesa_get_srgb_format_linear(src_format
);
97 if (!encode_srgb
&& _mesa_get_format_color_encoding(dst_format
) == GL_SRGB
)
98 dst_format
= _mesa_get_srgb_format_linear(dst_format
);
100 brw_blorp_blit_params
params(brw
,
101 src_mt
, src_level
, src_layer
, src_format
,
102 dst_mt
, dst_level
, dst_layer
, dst_format
,
107 filter
, mirror_x
, mirror_y
);
108 brw_blorp_exec(brw
, ¶ms
);
110 intel_miptree_slice_set_needs_hiz_resolve(dst_mt
, dst_level
, dst_layer
);
114 do_blorp_blit(struct brw_context
*brw
, GLbitfield buffer_bit
,
115 struct intel_renderbuffer
*src_irb
, mesa_format src_format
,
116 struct intel_renderbuffer
*dst_irb
, mesa_format dst_format
,
117 GLfloat srcX0
, GLfloat srcY0
, GLfloat srcX1
, GLfloat srcY1
,
118 GLfloat dstX0
, GLfloat dstY0
, GLfloat dstX1
, GLfloat dstY1
,
119 GLenum filter
, bool mirror_x
, bool mirror_y
)
121 /* Find source/dst miptrees */
122 struct intel_mipmap_tree
*src_mt
= find_miptree(buffer_bit
, src_irb
);
123 struct intel_mipmap_tree
*dst_mt
= find_miptree(buffer_bit
, dst_irb
);
125 const bool es3
= _mesa_is_gles3(&brw
->ctx
);
128 brw_blorp_blit_miptrees(brw
,
129 src_mt
, src_irb
->mt_level
, src_irb
->mt_layer
,
131 dst_mt
, dst_irb
->mt_level
, dst_irb
->mt_layer
,
133 srcX0
, srcY0
, srcX1
, srcY1
,
134 dstX0
, dstY0
, dstX1
, dstY1
,
135 filter
, mirror_x
, mirror_y
,
138 dst_irb
->need_downsample
= true;
142 try_blorp_blit(struct brw_context
*brw
,
143 const struct gl_framebuffer
*read_fb
,
144 const struct gl_framebuffer
*draw_fb
,
145 GLfloat srcX0
, GLfloat srcY0
, GLfloat srcX1
, GLfloat srcY1
,
146 GLfloat dstX0
, GLfloat dstY0
, GLfloat dstX1
, GLfloat dstY1
,
147 GLenum filter
, GLbitfield buffer_bit
)
149 struct gl_context
*ctx
= &brw
->ctx
;
151 /* Sync up the state of window system buffers. We need to do this before
152 * we go looking for the buffers.
154 intel_prepare_render(brw
);
156 bool mirror_x
, mirror_y
;
157 if (brw_meta_mirror_clip_and_scissor(ctx
, read_fb
, draw_fb
,
158 &srcX0
, &srcY0
, &srcX1
, &srcY1
,
159 &dstX0
, &dstY0
, &dstX1
, &dstY1
,
160 &mirror_x
, &mirror_y
))
164 struct intel_renderbuffer
*src_irb
;
165 struct intel_renderbuffer
*dst_irb
;
166 struct intel_mipmap_tree
*src_mt
;
167 struct intel_mipmap_tree
*dst_mt
;
168 switch (buffer_bit
) {
169 case GL_COLOR_BUFFER_BIT
:
170 src_irb
= intel_renderbuffer(read_fb
->_ColorReadBuffer
);
171 for (unsigned i
= 0; i
< draw_fb
->_NumColorDrawBuffers
; ++i
) {
172 dst_irb
= intel_renderbuffer(draw_fb
->_ColorDrawBuffers
[i
]);
174 do_blorp_blit(brw
, buffer_bit
,
175 src_irb
, src_irb
->Base
.Base
.Format
,
176 dst_irb
, dst_irb
->Base
.Base
.Format
,
177 srcX0
, srcY0
, srcX1
, srcY1
,
178 dstX0
, dstY0
, dstX1
, dstY1
,
179 filter
, mirror_x
, mirror_y
);
182 case GL_DEPTH_BUFFER_BIT
:
184 intel_renderbuffer(read_fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
);
186 intel_renderbuffer(draw_fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
);
187 src_mt
= find_miptree(buffer_bit
, src_irb
);
188 dst_mt
= find_miptree(buffer_bit
, dst_irb
);
190 /* We can't handle format conversions between Z24 and other formats
191 * since we have to lie about the surface format. See the comments in
192 * brw_blorp_surface_info::set().
194 if ((src_mt
->format
== MESA_FORMAT_Z24_UNORM_X8_UINT
) !=
195 (dst_mt
->format
== MESA_FORMAT_Z24_UNORM_X8_UINT
))
198 do_blorp_blit(brw
, buffer_bit
, src_irb
, MESA_FORMAT_NONE
,
199 dst_irb
, MESA_FORMAT_NONE
, srcX0
, srcY0
,
200 srcX1
, srcY1
, dstX0
, dstY0
, dstX1
, dstY1
,
201 filter
, mirror_x
, mirror_y
);
203 case GL_STENCIL_BUFFER_BIT
:
205 intel_renderbuffer(read_fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
);
207 intel_renderbuffer(draw_fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
);
208 do_blorp_blit(brw
, buffer_bit
, src_irb
, MESA_FORMAT_NONE
,
209 dst_irb
, MESA_FORMAT_NONE
, srcX0
, srcY0
,
210 srcX1
, srcY1
, dstX0
, dstY0
, dstX1
, dstY1
,
211 filter
, mirror_x
, mirror_y
);
214 unreachable("not reached");
221 brw_blorp_copytexsubimage(struct brw_context
*brw
,
222 struct gl_renderbuffer
*src_rb
,
223 struct gl_texture_image
*dst_image
,
225 int srcX0
, int srcY0
,
226 int dstX0
, int dstY0
,
227 int width
, int height
)
229 struct gl_context
*ctx
= &brw
->ctx
;
230 struct intel_renderbuffer
*src_irb
= intel_renderbuffer(src_rb
);
231 struct intel_texture_image
*intel_image
= intel_texture_image(dst_image
);
233 /* No pixel transfer operations (zoom, bias, mapping), just a blit */
234 if (brw
->ctx
._ImageTransferState
)
237 /* Sync up the state of window system buffers. We need to do this before
238 * we go looking at the src renderbuffer's miptree.
240 intel_prepare_render(brw
);
242 struct intel_mipmap_tree
*src_mt
= src_irb
->mt
;
243 struct intel_mipmap_tree
*dst_mt
= intel_image
->mt
;
245 /* BLORP is only supported for Gen6-7. */
246 if (brw
->gen
< 6 || brw
->gen
> 7)
249 if (_mesa_get_format_base_format(src_rb
->Format
) !=
250 _mesa_get_format_base_format(dst_image
->TexFormat
)) {
254 /* We can't handle format conversions between Z24 and other formats since
255 * we have to lie about the surface format. See the comments in
256 * brw_blorp_surface_info::set().
258 if ((src_mt
->format
== MESA_FORMAT_Z24_UNORM_X8_UINT
) !=
259 (dst_mt
->format
== MESA_FORMAT_Z24_UNORM_X8_UINT
)) {
263 if (!brw
->format_supported_as_render_target
[dst_image
->TexFormat
])
266 /* Source clipping shouldn't be necessary, since copytexsubimage (in
267 * src/mesa/main/teximage.c) calls _mesa_clip_copytexsubimage() which
270 * Destination clipping shouldn't be necessary since the restrictions on
271 * glCopyTexSubImage prevent the user from specifying a destination rectangle
272 * that falls outside the bounds of the destination texture.
273 * See error_check_subtexture_dimensions().
276 int srcY1
= srcY0
+ height
;
277 int srcX1
= srcX0
+ width
;
278 int dstX1
= dstX0
+ width
;
279 int dstY1
= dstY0
+ height
;
281 /* Account for the fact that in the system framebuffer, the origin is at
284 bool mirror_y
= false;
285 if (_mesa_is_winsys_fbo(ctx
->ReadBuffer
)) {
286 GLint tmp
= src_rb
->Height
- srcY0
;
287 srcY0
= src_rb
->Height
- srcY1
;
292 /* Account for face selection and texture view MinLayer */
293 int dst_slice
= slice
+ dst_image
->TexObject
->MinLayer
+ dst_image
->Face
;
294 int dst_level
= dst_image
->Level
+ dst_image
->TexObject
->MinLevel
;
296 brw_blorp_blit_miptrees(brw
,
297 src_mt
, src_irb
->mt_level
, src_irb
->mt_layer
,
299 dst_mt
, dst_level
, dst_slice
,
300 dst_image
->TexFormat
,
301 srcX0
, srcY0
, srcX1
, srcY1
,
302 dstX0
, dstY0
, dstX1
, dstY1
,
303 GL_NEAREST
, false, mirror_y
,
306 /* If we're copying to a packed depth stencil texture and the source
307 * framebuffer has separate stencil, we need to also copy the stencil data
310 src_rb
= ctx
->ReadBuffer
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
311 if (_mesa_get_format_bits(dst_image
->TexFormat
, GL_STENCIL_BITS
) > 0 &&
313 src_irb
= intel_renderbuffer(src_rb
);
314 src_mt
= src_irb
->mt
;
316 if (src_mt
->stencil_mt
)
317 src_mt
= src_mt
->stencil_mt
;
318 if (dst_mt
->stencil_mt
)
319 dst_mt
= dst_mt
->stencil_mt
;
321 if (src_mt
!= dst_mt
) {
322 brw_blorp_blit_miptrees(brw
,
323 src_mt
, src_irb
->mt_level
, src_irb
->mt_layer
,
325 dst_mt
, dst_level
, dst_slice
,
327 srcX0
, srcY0
, srcX1
, srcY1
,
328 dstX0
, dstY0
, dstX1
, dstY1
,
329 GL_NEAREST
, false, mirror_y
,
339 brw_blorp_framebuffer(struct brw_context
*brw
,
340 struct gl_framebuffer
*readFb
,
341 struct gl_framebuffer
*drawFb
,
342 GLint srcX0
, GLint srcY0
, GLint srcX1
, GLint srcY1
,
343 GLint dstX0
, GLint dstY0
, GLint dstX1
, GLint dstY1
,
344 GLbitfield mask
, GLenum filter
)
346 /* BLORP is not supported before Gen6. */
347 if (brw
->gen
< 6 || brw
->gen
>= 8)
350 static GLbitfield buffer_bits
[] = {
353 GL_STENCIL_BUFFER_BIT
,
356 for (unsigned int i
= 0; i
< ARRAY_SIZE(buffer_bits
); ++i
) {
357 if ((mask
& buffer_bits
[i
]) &&
358 try_blorp_blit(brw
, readFb
, drawFb
,
359 srcX0
, srcY0
, srcX1
, srcY1
,
360 dstX0
, dstY0
, dstX1
, dstY1
,
361 filter
, buffer_bits
[i
])) {
362 mask
&= ~buffer_bits
[i
];
371 * Enum to specify the order of arguments in a sampler message
373 enum sampler_message_arg
375 SAMPLER_MESSAGE_ARG_U_FLOAT
,
376 SAMPLER_MESSAGE_ARG_V_FLOAT
,
377 SAMPLER_MESSAGE_ARG_U_INT
,
378 SAMPLER_MESSAGE_ARG_V_INT
,
379 SAMPLER_MESSAGE_ARG_SI_INT
,
380 SAMPLER_MESSAGE_ARG_MCS_INT
,
381 SAMPLER_MESSAGE_ARG_ZERO_INT
,
385 * Generator for WM programs used in BLORP blits.
387 * The bulk of the work done by the WM program is to wrap and unwrap the
388 * coordinate transformations used by the hardware to store surfaces in
389 * memory. The hardware transforms a pixel location (X, Y, S) (where S is the
390 * sample index for a multisampled surface) to a memory offset by the
391 * following formulas:
393 * offset = tile(tiling_format, encode_msaa(num_samples, layout, X, Y, S))
394 * (X, Y, S) = decode_msaa(num_samples, layout, detile(tiling_format, offset))
396 * For a single-sampled surface, or for a multisampled surface using
397 * INTEL_MSAA_LAYOUT_UMS, encode_msaa() and decode_msaa are the identity
400 * encode_msaa(1, NONE, X, Y, 0) = (X, Y, 0)
401 * decode_msaa(1, NONE, X, Y, 0) = (X, Y, 0)
402 * encode_msaa(n, UMS, X, Y, S) = (X, Y, S)
403 * decode_msaa(n, UMS, X, Y, S) = (X, Y, S)
405 * For a 4x multisampled surface using INTEL_MSAA_LAYOUT_IMS, encode_msaa()
406 * embeds the sample number into bit 1 of the X and Y coordinates:
408 * encode_msaa(4, IMS, X, Y, S) = (X', Y', 0)
409 * where X' = (X & ~0b1) << 1 | (S & 0b1) << 1 | (X & 0b1)
410 * Y' = (Y & ~0b1 ) << 1 | (S & 0b10) | (Y & 0b1)
411 * decode_msaa(4, IMS, X, Y, 0) = (X', Y', S)
412 * where X' = (X & ~0b11) >> 1 | (X & 0b1)
413 * Y' = (Y & ~0b11) >> 1 | (Y & 0b1)
414 * S = (Y & 0b10) | (X & 0b10) >> 1
416 * For an 8x multisampled surface using INTEL_MSAA_LAYOUT_IMS, encode_msaa()
417 * embeds the sample number into bits 1 and 2 of the X coordinate and bit 1 of
420 * encode_msaa(8, IMS, X, Y, S) = (X', Y', 0)
421 * where X' = (X & ~0b1) << 2 | (S & 0b100) | (S & 0b1) << 1 | (X & 0b1)
422 * Y' = (Y & ~0b1) << 1 | (S & 0b10) | (Y & 0b1)
423 * decode_msaa(8, IMS, X, Y, 0) = (X', Y', S)
424 * where X' = (X & ~0b111) >> 2 | (X & 0b1)
425 * Y' = (Y & ~0b11) >> 1 | (Y & 0b1)
426 * S = (X & 0b100) | (Y & 0b10) | (X & 0b10) >> 1
428 * For X tiling, tile() combines together the low-order bits of the X and Y
429 * coordinates in the pattern 0byyyxxxxxxxxx, creating 4k tiles that are 512
430 * bytes wide and 8 rows high:
432 * tile(x_tiled, X, Y, S) = A
433 * where A = tile_num << 12 | offset
434 * tile_num = (Y' >> 3) * tile_pitch + (X' >> 9)
435 * offset = (Y' & 0b111) << 9
436 * | (X & 0b111111111)
438 * Y' = Y + S * qpitch
439 * detile(x_tiled, A) = (X, Y, S)
443 * Y' = (tile_num / tile_pitch) << 3
444 * | (A & 0b111000000000) >> 9
445 * X' = (tile_num % tile_pitch) << 9
446 * | (A & 0b111111111)
448 * (In all tiling formulas, cpp is the number of bytes occupied by a single
449 * sample ("chars per pixel"), tile_pitch is the number of 4k tiles required
450 * to fill the width of the surface, and qpitch is the spacing (in rows)
451 * between array slices).
453 * For Y tiling, tile() combines together the low-order bits of the X and Y
454 * coordinates in the pattern 0bxxxyyyyyxxxx, creating 4k tiles that are 128
455 * bytes wide and 32 rows high:
457 * tile(y_tiled, X, Y, S) = A
458 * where A = tile_num << 12 | offset
459 * tile_num = (Y' >> 5) * tile_pitch + (X' >> 7)
460 * offset = (X' & 0b1110000) << 5
461 * | (Y' & 0b11111) << 4
464 * Y' = Y + S * qpitch
465 * detile(y_tiled, A) = (X, Y, S)
469 * Y' = (tile_num / tile_pitch) << 5
470 * | (A & 0b111110000) >> 4
471 * X' = (tile_num % tile_pitch) << 7
472 * | (A & 0b111000000000) >> 5
475 * For W tiling, tile() combines together the low-order bits of the X and Y
476 * coordinates in the pattern 0bxxxyyyyxyxyx, creating 4k tiles that are 64
477 * bytes wide and 64 rows high (note that W tiling is only used for stencil
478 * buffers, which always have cpp = 1 and S=0):
480 * tile(w_tiled, X, Y, S) = A
481 * where A = tile_num << 12 | offset
482 * tile_num = (Y' >> 6) * tile_pitch + (X' >> 6)
483 * offset = (X' & 0b111000) << 6
484 * | (Y' & 0b111100) << 3
485 * | (X' & 0b100) << 2
491 * Y' = Y + S * qpitch
492 * detile(w_tiled, A) = (X, Y, S)
493 * where X = X' / cpp = X'
494 * Y = Y' % qpitch = Y'
496 * Y' = (tile_num / tile_pitch) << 6
497 * | (A & 0b111100000) >> 3
498 * | (A & 0b1000) >> 2
500 * X' = (tile_num % tile_pitch) << 6
501 * | (A & 0b111000000000) >> 6
502 * | (A & 0b10000) >> 2
506 * Finally, for a non-tiled surface, tile() simply combines together the X and
507 * Y coordinates in the natural way:
509 * tile(untiled, X, Y, S) = A
510 * where A = Y * pitch + X'
512 * Y' = Y + S * qpitch
513 * detile(untiled, A) = (X, Y, S)
520 * (In these formulas, pitch is the number of bytes occupied by a single row
523 class brw_blorp_blit_program
: public brw_blorp_eu_emitter
526 brw_blorp_blit_program(struct brw_context
*brw
,
527 const brw_blorp_blit_prog_key
*key
, bool debug_flag
);
529 const GLuint
*compile(struct brw_context
*brw
, GLuint
*program_size
);
531 brw_blorp_prog_data prog_data
;
535 void alloc_push_const_regs(int base_reg
);
536 void compute_frag_coords();
537 void translate_tiling(bool old_tiled_w
, bool new_tiled_w
);
538 void encode_msaa(unsigned num_samples
, intel_msaa_layout layout
);
539 void decode_msaa(unsigned num_samples
, intel_msaa_layout layout
);
540 void translate_dst_to_src();
541 void clamp_tex_coords(struct brw_reg regX
, struct brw_reg regY
,
542 struct brw_reg clampX0
, struct brw_reg clampY0
,
543 struct brw_reg clampX1
, struct brw_reg clampY1
);
544 void single_to_blend();
545 void manual_blend_average(unsigned num_samples
);
546 void manual_blend_bilinear(unsigned num_samples
);
547 void sample(struct brw_reg dst
);
548 void texel_fetch(struct brw_reg dst
);
550 void texture_lookup(struct brw_reg dst
, enum opcode op
,
551 const sampler_message_arg
*args
, int num_args
);
552 void render_target_write();
555 * Base-2 logarithm of the maximum number of samples that can be blended.
557 static const unsigned LOG2_MAX_BLEND_SAMPLES
= 3;
559 struct brw_context
*brw
;
560 const brw_blorp_blit_prog_key
*key
;
562 /* Thread dispatch header */
565 /* Pixel X/Y coordinates (always in R1). */
569 struct brw_reg dst_x0
;
570 struct brw_reg dst_x1
;
571 struct brw_reg dst_y0
;
572 struct brw_reg dst_y1
;
573 /* Top right coordinates of the rectangular grid used for scaled blitting */
574 struct brw_reg rect_grid_x1
;
575 struct brw_reg rect_grid_y1
;
577 struct brw_reg multiplier
;
578 struct brw_reg offset
;
579 } x_transform
, y_transform
;
581 /* Data read from texture (4 vec16's per array element) */
582 struct brw_reg texture_data
[LOG2_MAX_BLEND_SAMPLES
+ 1];
584 /* Auxiliary storage for the contents of the MCS surface.
586 * Since the sampler always returns 8 registers worth of data, this is 8
587 * registers wide, even though we only use the first 2 registers of it.
589 struct brw_reg mcs_data
;
591 /* X coordinates. We have two of them so that we can perform coordinate
592 * transformations easily.
594 struct brw_reg x_coords
[2];
596 /* Y coordinates. We have two of them so that we can perform coordinate
597 * transformations easily.
599 struct brw_reg y_coords
[2];
601 /* X, Y coordinates of the pixel from which we need to fetch the specific
602 * sample. These are used for multisample scaled blitting.
604 struct brw_reg x_sample_coords
;
605 struct brw_reg y_sample_coords
;
607 /* Fractional parts of the x and y coordinates, used as bilinear interpolation coefficients */
608 struct brw_reg x_frac
;
609 struct brw_reg y_frac
;
611 /* Which element of x_coords and y_coords is currently in use.
615 /* True if, at the point in the program currently being compiled, the
616 * sample index is known to be zero.
620 /* Register storing the sample index when s_is_zero is false. */
621 struct brw_reg sample_index
;
627 /* MRF used for sampling and render target writes */
631 brw_blorp_blit_program::brw_blorp_blit_program(
632 struct brw_context
*brw
,
633 const brw_blorp_blit_prog_key
*key
,
635 : brw_blorp_eu_emitter(brw
, debug_flag
),
642 brw_blorp_blit_program::compile(struct brw_context
*brw
,
643 GLuint
*program_size
)
646 if (key
->dst_tiled_w
&& key
->rt_samples
> 0) {
647 /* If the destination image is W tiled and multisampled, then the thread
648 * must be dispatched once per sample, not once per pixel. This is
649 * necessary because after conversion between W and Y tiling, there's no
650 * guarantee that all samples corresponding to a single pixel will still
653 assert(key
->persample_msaa_dispatch
);
657 /* We are blending, which means we won't have an opportunity to
658 * translate the tiling and sample count for the texture surface. So
659 * the surface state for the texture must be configured with the correct
660 * tiling and sample count.
662 assert(!key
->src_tiled_w
);
663 assert(key
->tex_samples
== key
->src_samples
);
664 assert(key
->tex_layout
== key
->src_layout
);
665 assert(key
->tex_samples
> 0);
668 if (key
->persample_msaa_dispatch
) {
669 /* It only makes sense to do persample dispatch if the render target is
670 * configured as multisampled.
672 assert(key
->rt_samples
> 0);
675 /* Make sure layout is consistent with sample count */
676 assert((key
->tex_layout
== INTEL_MSAA_LAYOUT_NONE
) ==
677 (key
->tex_samples
== 0));
678 assert((key
->rt_layout
== INTEL_MSAA_LAYOUT_NONE
) ==
679 (key
->rt_samples
== 0));
680 assert((key
->src_layout
== INTEL_MSAA_LAYOUT_NONE
) ==
681 (key
->src_samples
== 0));
682 assert((key
->dst_layout
== INTEL_MSAA_LAYOUT_NONE
) ==
683 (key
->dst_samples
== 0));
685 /* Set up prog_data */
686 memset(&prog_data
, 0, sizeof(prog_data
));
687 prog_data
.persample_msaa_dispatch
= key
->persample_msaa_dispatch
;
690 compute_frag_coords();
692 /* Render target and texture hardware don't support W tiling. */
693 const bool rt_tiled_w
= false;
694 const bool tex_tiled_w
= false;
696 /* The address that data will be written to is determined by the
697 * coordinates supplied to the WM thread and the tiling and sample count of
698 * the render target, according to the formula:
700 * (X, Y, S) = decode_msaa(rt_samples, detile(rt_tiling, offset))
702 * If the actual tiling and sample count of the destination surface are not
703 * the same as the configuration of the render target, then these
704 * coordinates are wrong and we have to adjust them to compensate for the
707 if (rt_tiled_w
!= key
->dst_tiled_w
||
708 key
->rt_samples
!= key
->dst_samples
||
709 key
->rt_layout
!= key
->dst_layout
) {
710 encode_msaa(key
->rt_samples
, key
->rt_layout
);
711 /* Now (X, Y, S) = detile(rt_tiling, offset) */
712 translate_tiling(rt_tiled_w
, key
->dst_tiled_w
);
713 /* Now (X, Y, S) = detile(dst_tiling, offset) */
714 decode_msaa(key
->dst_samples
, key
->dst_layout
);
717 /* Now (X, Y, S) = decode_msaa(dst_samples, detile(dst_tiling, offset)).
719 * That is: X, Y and S now contain the true coordinates and sample index of
720 * the data that the WM thread should output.
722 * If we need to kill pixels that are outside the destination rectangle,
723 * now is the time to do it.
727 emit_kill_if_outside_rect(x_coords
[xy_coord_index
],
728 y_coords
[xy_coord_index
],
729 dst_x0
, dst_x1
, dst_y0
, dst_y1
);
731 /* Next, apply a translation to obtain coordinates in the source image. */
732 translate_dst_to_src();
734 /* If the source image is not multisampled, then we want to fetch sample
735 * number 0, because that's the only sample there is.
737 if (key
->src_samples
== 0)
740 /* X, Y, and S are now the coordinates of the pixel in the source image
741 * that we want to texture from. Exception: if we are blending, then S is
742 * irrelevant, because we are going to fetch all samples.
744 if (key
->blend
&& !key
->blit_scaled
) {
746 /* Gen6 hardware an automatically blend using the SAMPLE message */
748 sample(texture_data
[0]);
750 /* Gen7+ hardware doesn't automaticaly blend. */
751 manual_blend_average(key
->src_samples
);
753 } else if(key
->blend
&& key
->blit_scaled
) {
754 manual_blend_bilinear(key
->src_samples
);
756 /* We aren't blending, which means we just want to fetch a single sample
757 * from the source surface. The address that we want to fetch from is
758 * related to the X, Y and S values according to the formula:
760 * (X, Y, S) = decode_msaa(src_samples, detile(src_tiling, offset)).
762 * If the actual tiling and sample count of the source surface are not
763 * the same as the configuration of the texture, then we need to adjust
764 * the coordinates to compensate for the difference.
766 if ((tex_tiled_w
!= key
->src_tiled_w
||
767 key
->tex_samples
!= key
->src_samples
||
768 key
->tex_layout
!= key
->src_layout
) &&
769 !key
->bilinear_filter
) {
770 encode_msaa(key
->src_samples
, key
->src_layout
);
771 /* Now (X, Y, S) = detile(src_tiling, offset) */
772 translate_tiling(key
->src_tiled_w
, tex_tiled_w
);
773 /* Now (X, Y, S) = detile(tex_tiling, offset) */
774 decode_msaa(key
->tex_samples
, key
->tex_layout
);
777 if (key
->bilinear_filter
) {
778 sample(texture_data
[0]);
781 /* Now (X, Y, S) = decode_msaa(tex_samples, detile(tex_tiling, offset)).
783 * In other words: X, Y, and S now contain values which, when passed to
784 * the texturing unit, will cause data to be read from the correct
785 * memory location. So we can fetch the texel now.
787 if (key
->tex_layout
== INTEL_MSAA_LAYOUT_CMS
)
789 texel_fetch(texture_data
[0]);
793 /* Finally, write the fetched (or blended) value to the render target and
794 * terminate the thread.
796 render_target_write();
798 return get_program(program_size
);
802 brw_blorp_blit_program::alloc_push_const_regs(int base_reg
)
804 #define CONST_LOC(name) offsetof(brw_blorp_wm_push_constants, name)
805 #define ALLOC_REG(name, type) \
807 retype(brw_vec1_reg(BRW_GENERAL_REGISTER_FILE, \
808 base_reg + CONST_LOC(name) / 32, \
809 (CONST_LOC(name) % 32) / 4), type)
811 ALLOC_REG(dst_x0
, BRW_REGISTER_TYPE_UD
);
812 ALLOC_REG(dst_x1
, BRW_REGISTER_TYPE_UD
);
813 ALLOC_REG(dst_y0
, BRW_REGISTER_TYPE_UD
);
814 ALLOC_REG(dst_y1
, BRW_REGISTER_TYPE_UD
);
815 ALLOC_REG(rect_grid_x1
, BRW_REGISTER_TYPE_F
);
816 ALLOC_REG(rect_grid_y1
, BRW_REGISTER_TYPE_F
);
817 ALLOC_REG(x_transform
.multiplier
, BRW_REGISTER_TYPE_F
);
818 ALLOC_REG(x_transform
.offset
, BRW_REGISTER_TYPE_F
);
819 ALLOC_REG(y_transform
.multiplier
, BRW_REGISTER_TYPE_F
);
820 ALLOC_REG(y_transform
.offset
, BRW_REGISTER_TYPE_F
);
826 brw_blorp_blit_program::alloc_regs()
829 this->R0
= retype(brw_vec8_grf(reg
++, 0), BRW_REGISTER_TYPE_UW
);
830 this->R1
= retype(brw_vec8_grf(reg
++, 0), BRW_REGISTER_TYPE_UW
);
831 prog_data
.first_curbe_grf
= reg
;
832 alloc_push_const_regs(reg
);
833 reg
+= BRW_BLORP_NUM_PUSH_CONST_REGS
;
834 for (unsigned i
= 0; i
< ARRAY_SIZE(texture_data
); ++i
) {
835 this->texture_data
[i
] =
836 retype(vec16(brw_vec8_grf(reg
, 0)), key
->texture_data_type
);
840 retype(brw_vec8_grf(reg
, 0), BRW_REGISTER_TYPE_UD
); reg
+= 8;
842 for (int i
= 0; i
< 2; ++i
) {
844 = retype(brw_vec8_grf(reg
, 0), BRW_REGISTER_TYPE_UD
);
847 = retype(brw_vec8_grf(reg
, 0), BRW_REGISTER_TYPE_UD
);
851 if (key
->blit_scaled
&& key
->blend
) {
852 this->x_sample_coords
= brw_vec8_grf(reg
, 0);
854 this->y_sample_coords
= brw_vec8_grf(reg
, 0);
856 this->x_frac
= brw_vec8_grf(reg
, 0);
858 this->y_frac
= brw_vec8_grf(reg
, 0);
862 this->xy_coord_index
= 0;
864 = retype(brw_vec8_grf(reg
, 0), BRW_REGISTER_TYPE_UD
);
866 this->t1
= retype(brw_vec8_grf(reg
, 0), BRW_REGISTER_TYPE_UD
);
868 this->t2
= retype(brw_vec8_grf(reg
, 0), BRW_REGISTER_TYPE_UD
);
871 /* Make sure we didn't run out of registers */
872 assert(reg
<= GEN7_MRF_HACK_START
);
875 this->base_mrf
= mrf
;
878 /* In the code that follows, X and Y can be used to quickly refer to the
879 * active elements of x_coords and y_coords, and Xp and Yp ("X prime" and "Y
880 * prime") to the inactive elements.
882 * S can be used to quickly refer to sample_index.
884 #define X x_coords[xy_coord_index]
885 #define Y y_coords[xy_coord_index]
886 #define Xp x_coords[!xy_coord_index]
887 #define Yp y_coords[!xy_coord_index]
888 #define S sample_index
890 /* Quickly swap the roles of (X, Y) and (Xp, Yp). Saves us from having to do
891 * MOVs to transfor (Xp, Yp) to (X, Y) after a coordinate transformation.
893 #define SWAP_XY_AND_XPYP() xy_coord_index = !xy_coord_index;
896 * Emit code to compute the X and Y coordinates of the pixels being rendered
897 * by this WM invocation.
899 * Assuming the render target is set up for Y tiling, these (X, Y) values are
900 * related to the address offset where outputs will be written by the formula:
902 * (X, Y, S) = decode_msaa(detile(offset)).
904 * (See brw_blorp_blit_program).
907 brw_blorp_blit_program::compute_frag_coords()
909 /* R1.2[15:0] = X coordinate of upper left pixel of subspan 0 (pixel 0)
910 * R1.3[15:0] = X coordinate of upper left pixel of subspan 1 (pixel 4)
911 * R1.4[15:0] = X coordinate of upper left pixel of subspan 2 (pixel 8)
912 * R1.5[15:0] = X coordinate of upper left pixel of subspan 3 (pixel 12)
914 * Pixels within a subspan are laid out in this arrangement:
918 * So, to compute the coordinates of each pixel, we need to read every 2nd
919 * 16-bit value (vstride=2) from R1, starting at the 4th 16-bit value
920 * (suboffset=4), and duplicate each value 4 times (hstride=0, width=4).
921 * In other words, the data we want to access is R1.4<2;4,0>UW.
923 * Then, we need to add the repeating sequence (0, 1, 0, 1, ...) to the
924 * result, since pixels n+1 and n+3 are in the right half of the subspan.
926 emit_add(vec16(retype(X
, BRW_REGISTER_TYPE_UW
)),
927 stride(suboffset(R1
, 4), 2, 4, 0), brw_imm_v(0x10101010));
929 /* Similarly, Y coordinates for subspans come from R1.2[31:16] through
930 * R1.5[31:16], so to get pixel Y coordinates we need to start at the 5th
931 * 16-bit value instead of the 4th (R1.5<2;4,0>UW instead of
934 * And we need to add the repeating sequence (0, 0, 1, 1, ...), since
935 * pixels n+2 and n+3 are in the bottom half of the subspan.
937 emit_add(vec16(retype(Y
, BRW_REGISTER_TYPE_UW
)),
938 stride(suboffset(R1
, 5), 2, 4, 0), brw_imm_v(0x11001100));
940 /* Move the coordinates to UD registers. */
941 emit_mov(vec16(Xp
), retype(X
, BRW_REGISTER_TYPE_UW
));
942 emit_mov(vec16(Yp
), retype(Y
, BRW_REGISTER_TYPE_UW
));
945 if (key
->persample_msaa_dispatch
) {
946 switch (key
->rt_samples
) {
948 /* The WM will be run in MSDISPMODE_PERSAMPLE with num_samples == 4.
949 * Therefore, subspan 0 will represent sample 0, subspan 1 will
950 * represent sample 1, and so on.
952 * So we need to populate S with the sequence (0, 0, 0, 0, 1, 1, 1,
953 * 1, 2, 2, 2, 2, 3, 3, 3, 3). The easiest way to do this is to
954 * populate a temporary variable with the sequence (0, 1, 2, 3), and
955 * then copy from it using vstride=1, width=4, hstride=0.
957 struct brw_reg t1_uw1
= retype(t1
, BRW_REGISTER_TYPE_UW
);
958 emit_mov(vec16(t1_uw1
), brw_imm_v(0x3210));
959 /* Move to UD sample_index register. */
960 emit_mov_8(S
, stride(t1_uw1
, 1, 4, 0));
961 emit_mov_8(offset(S
, 1), suboffset(stride(t1_uw1
, 1, 4, 0), 2));
965 /* The WM will be run in MSDISPMODE_PERSAMPLE with num_samples == 8.
966 * Therefore, subspan 0 will represent sample N (where N is 0 or 4),
967 * subspan 1 will represent sample 1, and so on. We can find the
968 * value of N by looking at R0.0 bits 7:6 ("Starting Sample Pair
969 * Index") and multiplying by two (since samples are always delivered
970 * in pairs). That is, we compute 2*((R0.0 & 0xc0) >> 6) == (R0.0 &
973 * Then we need to add N to the sequence (0, 0, 0, 0, 1, 1, 1, 1, 2,
974 * 2, 2, 2, 3, 3, 3, 3), which we compute by populating a temporary
975 * variable with the sequence (0, 1, 2, 3), and then reading from it
976 * using vstride=1, width=4, hstride=0.
978 struct brw_reg t1_ud1
= vec1(retype(t1
, BRW_REGISTER_TYPE_UD
));
979 struct brw_reg t2_uw1
= retype(t2
, BRW_REGISTER_TYPE_UW
);
980 struct brw_reg r0_ud1
= vec1(retype(R0
, BRW_REGISTER_TYPE_UD
));
981 emit_and(t1_ud1
, r0_ud1
, brw_imm_ud(0xc0));
982 emit_shr(t1_ud1
, t1_ud1
, brw_imm_ud(5));
983 emit_mov(vec16(t2_uw1
), brw_imm_v(0x3210));
984 emit_add(vec16(S
), retype(t1_ud1
, BRW_REGISTER_TYPE_UW
),
985 stride(t2_uw1
, 1, 4, 0));
986 emit_add_8(offset(S
, 1),
987 retype(t1_ud1
, BRW_REGISTER_TYPE_UW
),
988 suboffset(stride(t2_uw1
, 1, 4, 0), 2));
992 unreachable("Unrecognized sample count in "
993 "brw_blorp_blit_program::compute_frag_coords()");
997 /* Either the destination surface is single-sampled, or the WM will be
998 * run in MSDISPMODE_PERPIXEL (which causes a single fragment dispatch
999 * per pixel). In either case, it's not meaningful to compute a sample
1000 * value. Just set it to 0.
1007 * Emit code to compensate for the difference between Y and W tiling.
1009 * This code modifies the X and Y coordinates according to the formula:
1011 * (X', Y', S') = detile(new_tiling, tile(old_tiling, X, Y, S))
1013 * (See brw_blorp_blit_program).
1015 * It can only translate between W and Y tiling, so new_tiling and old_tiling
1016 * are booleans where true represents W tiling and false represents Y tiling.
1019 brw_blorp_blit_program::translate_tiling(bool old_tiled_w
, bool new_tiled_w
)
1021 if (old_tiled_w
== new_tiled_w
)
1024 /* In the code that follows, we can safely assume that S = 0, because W
1025 * tiling formats always use IMS layout.
1030 /* Given X and Y coordinates that describe an address using Y tiling,
1031 * translate to the X and Y coordinates that describe the same address
1034 * If we break down the low order bits of X and Y, using a
1035 * single letter to represent each low-order bit:
1037 * X = A << 7 | 0bBCDEFGH
1038 * Y = J << 5 | 0bKLMNP (1)
1040 * Then we can apply the Y tiling formula to see the memory offset being
1043 * offset = (J * tile_pitch + A) << 12 | 0bBCDKLMNPEFGH (2)
1045 * If we apply the W detiling formula to this memory location, that the
1046 * corresponding X' and Y' coordinates are:
1048 * X' = A << 6 | 0bBCDPFH (3)
1049 * Y' = J << 6 | 0bKLMNEG
1051 * Combining (1) and (3), we see that to transform (X, Y) to (X', Y'),
1052 * we need to make the following computation:
1054 * X' = (X & ~0b1011) >> 1 | (Y & 0b1) << 2 | X & 0b1 (4)
1055 * Y' = (Y & ~0b1) << 1 | (X & 0b1000) >> 2 | (X & 0b10) >> 1
1057 emit_and(t1
, X
, brw_imm_uw(0xfff4)); /* X & ~0b1011 */
1058 emit_shr(t1
, t1
, brw_imm_uw(1)); /* (X & ~0b1011) >> 1 */
1059 emit_and(t2
, Y
, brw_imm_uw(1)); /* Y & 0b1 */
1060 emit_shl(t2
, t2
, brw_imm_uw(2)); /* (Y & 0b1) << 2 */
1061 emit_or(t1
, t1
, t2
); /* (X & ~0b1011) >> 1 | (Y & 0b1) << 2 */
1062 emit_and(t2
, X
, brw_imm_uw(1)); /* X & 0b1 */
1063 emit_or(Xp
, t1
, t2
);
1064 emit_and(t1
, Y
, brw_imm_uw(0xfffe)); /* Y & ~0b1 */
1065 emit_shl(t1
, t1
, brw_imm_uw(1)); /* (Y & ~0b1) << 1 */
1066 emit_and(t2
, X
, brw_imm_uw(8)); /* X & 0b1000 */
1067 emit_shr(t2
, t2
, brw_imm_uw(2)); /* (X & 0b1000) >> 2 */
1068 emit_or(t1
, t1
, t2
); /* (Y & ~0b1) << 1 | (X & 0b1000) >> 2 */
1069 emit_and(t2
, X
, brw_imm_uw(2)); /* X & 0b10 */
1070 emit_shr(t2
, t2
, brw_imm_uw(1)); /* (X & 0b10) >> 1 */
1071 emit_or(Yp
, t1
, t2
);
1074 /* Applying the same logic as above, but in reverse, we obtain the
1077 * X' = (X & ~0b101) << 1 | (Y & 0b10) << 2 | (Y & 0b1) << 1 | X & 0b1
1078 * Y' = (Y & ~0b11) >> 1 | (X & 0b100) >> 2
1080 emit_and(t1
, X
, brw_imm_uw(0xfffa)); /* X & ~0b101 */
1081 emit_shl(t1
, t1
, brw_imm_uw(1)); /* (X & ~0b101) << 1 */
1082 emit_and(t2
, Y
, brw_imm_uw(2)); /* Y & 0b10 */
1083 emit_shl(t2
, t2
, brw_imm_uw(2)); /* (Y & 0b10) << 2 */
1084 emit_or(t1
, t1
, t2
); /* (X & ~0b101) << 1 | (Y & 0b10) << 2 */
1085 emit_and(t2
, Y
, brw_imm_uw(1)); /* Y & 0b1 */
1086 emit_shl(t2
, t2
, brw_imm_uw(1)); /* (Y & 0b1) << 1 */
1087 emit_or(t1
, t1
, t2
); /* (X & ~0b101) << 1 | (Y & 0b10) << 2
1089 emit_and(t2
, X
, brw_imm_uw(1)); /* X & 0b1 */
1090 emit_or(Xp
, t1
, t2
);
1091 emit_and(t1
, Y
, brw_imm_uw(0xfffc)); /* Y & ~0b11 */
1092 emit_shr(t1
, t1
, brw_imm_uw(1)); /* (Y & ~0b11) >> 1 */
1093 emit_and(t2
, X
, brw_imm_uw(4)); /* X & 0b100 */
1094 emit_shr(t2
, t2
, brw_imm_uw(2)); /* (X & 0b100) >> 2 */
1095 emit_or(Yp
, t1
, t2
);
1101 * Emit code to compensate for the difference between MSAA and non-MSAA
1104 * This code modifies the X and Y coordinates according to the formula:
1106 * (X', Y', S') = encode_msaa(num_samples, IMS, X, Y, S)
1108 * (See brw_blorp_blit_program).
1111 brw_blorp_blit_program::encode_msaa(unsigned num_samples
,
1112 intel_msaa_layout layout
)
1115 case INTEL_MSAA_LAYOUT_NONE
:
1116 /* No translation necessary, and S should already be zero. */
1119 case INTEL_MSAA_LAYOUT_CMS
:
1120 /* We can't compensate for compressed layout since at this point in the
1121 * program we haven't read from the MCS buffer.
1123 unreachable("Bad layout in encode_msaa");
1124 case INTEL_MSAA_LAYOUT_UMS
:
1125 /* No translation necessary. */
1127 case INTEL_MSAA_LAYOUT_IMS
:
1128 switch (num_samples
) {
1130 /* encode_msaa(4, IMS, X, Y, S) = (X', Y', 0)
1131 * where X' = (X & ~0b1) << 1 | (S & 0b1) << 1 | (X & 0b1)
1132 * Y' = (Y & ~0b1) << 1 | (S & 0b10) | (Y & 0b1)
1134 emit_and(t1
, X
, brw_imm_uw(0xfffe)); /* X & ~0b1 */
1136 emit_and(t2
, S
, brw_imm_uw(1)); /* S & 0b1 */
1137 emit_or(t1
, t1
, t2
); /* (X & ~0b1) | (S & 0b1) */
1139 emit_shl(t1
, t1
, brw_imm_uw(1)); /* (X & ~0b1) << 1
1141 emit_and(t2
, X
, brw_imm_uw(1)); /* X & 0b1 */
1142 emit_or(Xp
, t1
, t2
);
1143 emit_and(t1
, Y
, brw_imm_uw(0xfffe)); /* Y & ~0b1 */
1144 emit_shl(t1
, t1
, brw_imm_uw(1)); /* (Y & ~0b1) << 1 */
1146 emit_and(t2
, S
, brw_imm_uw(2)); /* S & 0b10 */
1147 emit_or(t1
, t1
, t2
); /* (Y & ~0b1) << 1 | (S & 0b10) */
1149 emit_and(t2
, Y
, brw_imm_uw(1)); /* Y & 0b1 */
1150 emit_or(Yp
, t1
, t2
);
1153 /* encode_msaa(8, IMS, X, Y, S) = (X', Y', 0)
1154 * where X' = (X & ~0b1) << 2 | (S & 0b100) | (S & 0b1) << 1
1156 * Y' = (Y & ~0b1) << 1 | (S & 0b10) | (Y & 0b1)
1158 emit_and(t1
, X
, brw_imm_uw(0xfffe)); /* X & ~0b1 */
1159 emit_shl(t1
, t1
, brw_imm_uw(2)); /* (X & ~0b1) << 2 */
1161 emit_and(t2
, S
, brw_imm_uw(4)); /* S & 0b100 */
1162 emit_or(t1
, t1
, t2
); /* (X & ~0b1) << 2 | (S & 0b100) */
1163 emit_and(t2
, S
, brw_imm_uw(1)); /* S & 0b1 */
1164 emit_shl(t2
, t2
, brw_imm_uw(1)); /* (S & 0b1) << 1 */
1165 emit_or(t1
, t1
, t2
); /* (X & ~0b1) << 2 | (S & 0b100)
1168 emit_and(t2
, X
, brw_imm_uw(1)); /* X & 0b1 */
1169 emit_or(Xp
, t1
, t2
);
1170 emit_and(t1
, Y
, brw_imm_uw(0xfffe)); /* Y & ~0b1 */
1171 emit_shl(t1
, t1
, brw_imm_uw(1)); /* (Y & ~0b1) << 1 */
1173 emit_and(t2
, S
, brw_imm_uw(2)); /* S & 0b10 */
1174 emit_or(t1
, t1
, t2
); /* (Y & ~0b1) << 1 | (S & 0b10) */
1176 emit_and(t2
, Y
, brw_imm_uw(1)); /* Y & 0b1 */
1177 emit_or(Yp
, t1
, t2
);
1187 * Emit code to compensate for the difference between MSAA and non-MSAA
1190 * This code modifies the X and Y coordinates according to the formula:
1192 * (X', Y', S) = decode_msaa(num_samples, IMS, X, Y, S)
1194 * (See brw_blorp_blit_program).
1197 brw_blorp_blit_program::decode_msaa(unsigned num_samples
,
1198 intel_msaa_layout layout
)
1201 case INTEL_MSAA_LAYOUT_NONE
:
1202 /* No translation necessary, and S should already be zero. */
1205 case INTEL_MSAA_LAYOUT_CMS
:
1206 /* We can't compensate for compressed layout since at this point in the
1207 * program we don't have access to the MCS buffer.
1209 unreachable("Bad layout in encode_msaa");
1210 case INTEL_MSAA_LAYOUT_UMS
:
1211 /* No translation necessary. */
1213 case INTEL_MSAA_LAYOUT_IMS
:
1215 switch (num_samples
) {
1217 /* decode_msaa(4, IMS, X, Y, 0) = (X', Y', S)
1218 * where X' = (X & ~0b11) >> 1 | (X & 0b1)
1219 * Y' = (Y & ~0b11) >> 1 | (Y & 0b1)
1220 * S = (Y & 0b10) | (X & 0b10) >> 1
1222 emit_and(t1
, X
, brw_imm_uw(0xfffc)); /* X & ~0b11 */
1223 emit_shr(t1
, t1
, brw_imm_uw(1)); /* (X & ~0b11) >> 1 */
1224 emit_and(t2
, X
, brw_imm_uw(1)); /* X & 0b1 */
1225 emit_or(Xp
, t1
, t2
);
1226 emit_and(t1
, Y
, brw_imm_uw(0xfffc)); /* Y & ~0b11 */
1227 emit_shr(t1
, t1
, brw_imm_uw(1)); /* (Y & ~0b11) >> 1 */
1228 emit_and(t2
, Y
, brw_imm_uw(1)); /* Y & 0b1 */
1229 emit_or(Yp
, t1
, t2
);
1230 emit_and(t1
, Y
, brw_imm_uw(2)); /* Y & 0b10 */
1231 emit_and(t2
, X
, brw_imm_uw(2)); /* X & 0b10 */
1232 emit_shr(t2
, t2
, brw_imm_uw(1)); /* (X & 0b10) >> 1 */
1236 /* decode_msaa(8, IMS, X, Y, 0) = (X', Y', S)
1237 * where X' = (X & ~0b111) >> 2 | (X & 0b1)
1238 * Y' = (Y & ~0b11) >> 1 | (Y & 0b1)
1239 * S = (X & 0b100) | (Y & 0b10) | (X & 0b10) >> 1
1241 emit_and(t1
, X
, brw_imm_uw(0xfff8)); /* X & ~0b111 */
1242 emit_shr(t1
, t1
, brw_imm_uw(2)); /* (X & ~0b111) >> 2 */
1243 emit_and(t2
, X
, brw_imm_uw(1)); /* X & 0b1 */
1244 emit_or(Xp
, t1
, t2
);
1245 emit_and(t1
, Y
, brw_imm_uw(0xfffc)); /* Y & ~0b11 */
1246 emit_shr(t1
, t1
, brw_imm_uw(1)); /* (Y & ~0b11) >> 1 */
1247 emit_and(t2
, Y
, brw_imm_uw(1)); /* Y & 0b1 */
1248 emit_or(Yp
, t1
, t2
);
1249 emit_and(t1
, X
, brw_imm_uw(4)); /* X & 0b100 */
1250 emit_and(t2
, Y
, brw_imm_uw(2)); /* Y & 0b10 */
1251 emit_or(t1
, t1
, t2
); /* (X & 0b100) | (Y & 0b10) */
1252 emit_and(t2
, X
, brw_imm_uw(2)); /* X & 0b10 */
1253 emit_shr(t2
, t2
, brw_imm_uw(1)); /* (X & 0b10) >> 1 */
1264 * Emit code to translate from destination (X, Y) coordinates to source (X, Y)
1268 brw_blorp_blit_program::translate_dst_to_src()
1270 struct brw_reg X_f
= retype(X
, BRW_REGISTER_TYPE_F
);
1271 struct brw_reg Y_f
= retype(Y
, BRW_REGISTER_TYPE_F
);
1272 struct brw_reg Xp_f
= retype(Xp
, BRW_REGISTER_TYPE_F
);
1273 struct brw_reg Yp_f
= retype(Yp
, BRW_REGISTER_TYPE_F
);
1275 /* Move the UD coordinates to float registers. */
1278 /* Scale and offset */
1279 emit_mad(X_f
, x_transform
.offset
, Xp_f
, x_transform
.multiplier
);
1280 emit_mad(Y_f
, y_transform
.offset
, Yp_f
, y_transform
.multiplier
);
1281 if (key
->blit_scaled
&& key
->blend
) {
1282 /* Translate coordinates to lay out the samples in a rectangular grid
1283 * roughly corresponding to sample locations.
1285 emit_mul(X_f
, X_f
, brw_imm_f(key
->x_scale
));
1286 emit_mul(Y_f
, Y_f
, brw_imm_f(key
->y_scale
));
1287 /* Adjust coordinates so that integers represent pixel centers rather
1290 emit_add(X_f
, X_f
, brw_imm_f(-0.5));
1291 emit_add(Y_f
, Y_f
, brw_imm_f(-0.5));
1293 /* Clamp the X, Y texture coordinates to properly handle the sampling of
1294 * texels on texture edges.
1296 clamp_tex_coords(X_f
, Y_f
,
1297 brw_imm_f(0.0), brw_imm_f(0.0),
1298 rect_grid_x1
, rect_grid_y1
);
1300 /* Store the fractional parts to be used as bilinear interpolation
1303 emit_frc(x_frac
, X_f
);
1304 emit_frc(y_frac
, Y_f
);
1306 /* Round the float coordinates down to nearest integer */
1307 emit_rndd(Xp_f
, X_f
);
1308 emit_rndd(Yp_f
, Y_f
);
1309 emit_mul(X_f
, Xp_f
, brw_imm_f(1.0f
/ key
->x_scale
));
1310 emit_mul(Y_f
, Yp_f
, brw_imm_f(1.0f
/ key
->y_scale
));
1312 } else if (!key
->bilinear_filter
) {
1313 /* Round the float coordinates down to nearest integer by moving to
1323 brw_blorp_blit_program::clamp_tex_coords(struct brw_reg regX
,
1324 struct brw_reg regY
,
1325 struct brw_reg clampX0
,
1326 struct brw_reg clampY0
,
1327 struct brw_reg clampX1
,
1328 struct brw_reg clampY1
)
1330 emit_max(regX
, regX
, clampX0
);
1331 emit_max(regY
, regY
, clampY0
);
1332 emit_min(regX
, regX
, clampX1
);
1333 emit_min(regY
, regY
, clampY1
);
1337 * Emit code to transform the X and Y coordinates as needed for blending
1338 * together the different samples in an MSAA texture.
1341 brw_blorp_blit_program::single_to_blend()
1343 /* When looking up samples in an MSAA texture using the SAMPLE message,
1344 * Gen6 requires the texture coordinates to be odd integers (so that they
1345 * correspond to the center of a 2x2 block representing the four samples
1346 * that maxe up a pixel). So we need to multiply our X and Y coordinates
1347 * each by 2 and then add 1.
1349 emit_shl(t1
, X
, brw_imm_w(1));
1350 emit_shl(t2
, Y
, brw_imm_w(1));
1351 emit_add(Xp
, t1
, brw_imm_w(1));
1352 emit_add(Yp
, t2
, brw_imm_w(1));
1358 * Count the number of trailing 1 bits in the given value. For example:
1360 * count_trailing_one_bits(0) == 0
1361 * count_trailing_one_bits(7) == 3
1362 * count_trailing_one_bits(11) == 2
1364 static inline int count_trailing_one_bits(unsigned value
)
1366 #ifdef HAVE___BUILTIN_CTZ
1367 return __builtin_ctz(~value
);
1369 return _mesa_bitcount(value
& ~(value
+ 1));
1375 brw_blorp_blit_program::manual_blend_average(unsigned num_samples
)
1377 if (key
->tex_layout
== INTEL_MSAA_LAYOUT_CMS
)
1380 /* We add together samples using a binary tree structure, e.g. for 4x MSAA:
1382 * result = ((sample[0] + sample[1]) + (sample[2] + sample[3])) / 4
1384 * This ensures that when all samples have the same value, no numerical
1385 * precision is lost, since each addition operation always adds two equal
1386 * values, and summing two equal floating point values does not lose
1389 * We perform this computation by treating the texture_data array as a
1390 * stack and performing the following operations:
1392 * - push sample 0 onto stack
1393 * - push sample 1 onto stack
1394 * - add top two stack entries
1395 * - push sample 2 onto stack
1396 * - push sample 3 onto stack
1397 * - add top two stack entries
1398 * - add top two stack entries
1399 * - divide top stack entry by 4
1401 * Note that after pushing sample i onto the stack, the number of add
1402 * operations we do is equal to the number of trailing 1 bits in i. This
1403 * works provided the total number of samples is a power of two, which it
1404 * always is for i965.
1406 * For integer formats, we replace the add operations with average
1407 * operations and skip the final division.
1409 unsigned stack_depth
= 0;
1410 for (unsigned i
= 0; i
< num_samples
; ++i
) {
1411 assert(stack_depth
== _mesa_bitcount(i
)); /* Loop invariant */
1413 /* Push sample i onto the stack */
1414 assert(stack_depth
< ARRAY_SIZE(texture_data
));
1419 emit_mov(vec16(S
), brw_imm_ud(i
));
1421 texel_fetch(texture_data
[stack_depth
++]);
1423 if (i
== 0 && key
->tex_layout
== INTEL_MSAA_LAYOUT_CMS
) {
1424 /* The Ivy Bridge PRM, Vol4 Part1 p27 (Multisample Control Surface)
1425 * suggests an optimization:
1427 * "A simple optimization with probable large return in
1428 * performance is to compare the MCS value to zero (indicating
1429 * all samples are on sample slice 0), and sample only from
1430 * sample slice 0 using ld2dss if MCS is zero."
1432 * Note that in the case where the MCS value is zero, sampling from
1433 * sample slice 0 using ld2dss and sampling from sample 0 using
1434 * ld2dms are equivalent (since all samples are on sample slice 0).
1435 * Since we have already sampled from sample 0, all we need to do is
1436 * skip the remaining fetches and averaging if MCS is zero.
1438 emit_cmp_if(BRW_CONDITIONAL_NZ
, mcs_data
, brw_imm_ud(0));
1441 /* Do count_trailing_one_bits(i) times */
1442 for (int j
= count_trailing_one_bits(i
); j
-- > 0; ) {
1443 assert(stack_depth
>= 2);
1446 /* TODO: should use a smaller loop bound for non_RGBA formats */
1447 for (int k
= 0; k
< 4; ++k
) {
1448 emit_combine(key
->texture_data_type
== BRW_REGISTER_TYPE_F
?
1449 BRW_OPCODE_ADD
: BRW_OPCODE_AVG
,
1450 offset(texture_data
[stack_depth
- 1], 2*k
),
1451 offset(vec8(texture_data
[stack_depth
- 1]), 2*k
),
1452 offset(vec8(texture_data
[stack_depth
]), 2*k
));
1457 /* We should have just 1 sample on the stack now. */
1458 assert(stack_depth
== 1);
1460 if (key
->texture_data_type
== BRW_REGISTER_TYPE_F
) {
1461 /* Scale the result down by a factor of num_samples */
1462 /* TODO: should use a smaller loop bound for non-RGBA formats */
1463 for (int j
= 0; j
< 4; ++j
) {
1464 emit_mul(offset(texture_data
[0], 2*j
),
1465 offset(vec8(texture_data
[0]), 2*j
),
1466 brw_imm_f(1.0f
/ num_samples
));
1470 if (key
->tex_layout
== INTEL_MSAA_LAYOUT_CMS
)
1475 brw_blorp_blit_program::manual_blend_bilinear(unsigned num_samples
)
1477 /* We do this computation by performing the following operations:
1479 * In case of 4x, 8x MSAA:
1480 * - Compute the pixel coordinates and sample numbers (a, b, c, d)
1481 * which are later used for interpolation
1482 * - linearly interpolate samples a and b in X
1483 * - linearly interpolate samples c and d in X
1484 * - linearly interpolate the results of last two operations in Y
1486 * result = lrp(lrp(a + b) + lrp(c + d))
1488 struct brw_reg Xp_f
= retype(Xp
, BRW_REGISTER_TYPE_F
);
1489 struct brw_reg Yp_f
= retype(Yp
, BRW_REGISTER_TYPE_F
);
1490 struct brw_reg t1_f
= retype(t1
, BRW_REGISTER_TYPE_F
);
1491 struct brw_reg t2_f
= retype(t2
, BRW_REGISTER_TYPE_F
);
1493 for (unsigned i
= 0; i
< 4; ++i
) {
1494 assert(i
< ARRAY_SIZE(texture_data
));
1497 /* Compute pixel coordinates */
1498 emit_add(vec16(x_sample_coords
), Xp_f
,
1499 brw_imm_f((float)(i
& 0x1) * (1.0f
/ key
->x_scale
)));
1500 emit_add(vec16(y_sample_coords
), Yp_f
,
1501 brw_imm_f((float)((i
>> 1) & 0x1) * (1.0f
/ key
->y_scale
)));
1502 emit_mov(vec16(X
), x_sample_coords
);
1503 emit_mov(vec16(Y
), y_sample_coords
);
1505 /* The MCS value we fetch has to match up with the pixel that we're
1506 * sampling from. Since we sample from different pixels in each
1507 * iteration of this "for" loop, the call to mcs_fetch() should be
1508 * here inside the loop after computing the pixel coordinates.
1510 if (key
->tex_layout
== INTEL_MSAA_LAYOUT_CMS
)
1513 /* Compute sample index and map the sample index to a sample number.
1514 * Sample index layout shows the numbering of slots in a rectangular
1515 * grid of samples with in a pixel. Sample number layout shows the
1516 * rectangular grid of samples roughly corresponding to the real sample
1517 * locations with in a pixel.
1518 * In case of 4x MSAA, layout of sample indices matches the layout of
1526 * In case of 8x MSAA the two layouts don't match.
1527 * sample index layout : --------- sample number layout : ---------
1528 * | 0 | 1 | | 5 | 2 |
1529 * --------- ---------
1530 * | 2 | 3 | | 4 | 6 |
1531 * --------- ---------
1532 * | 4 | 5 | | 0 | 3 |
1533 * --------- ---------
1534 * | 6 | 7 | | 7 | 1 |
1535 * --------- ---------
1537 emit_frc(vec16(t1_f
), x_sample_coords
);
1538 emit_frc(vec16(t2_f
), y_sample_coords
);
1539 emit_mul(vec16(t1_f
), t1_f
, brw_imm_f(key
->x_scale
));
1540 emit_mul(vec16(t2_f
), t2_f
, brw_imm_f(key
->x_scale
* key
->y_scale
));
1541 emit_add(vec16(t1_f
), t1_f
, t2_f
);
1542 emit_mov(vec16(S
), t1_f
);
1544 if (num_samples
== 8) {
1545 /* Map the sample index to a sample number */
1546 emit_cmp_if(BRW_CONDITIONAL_L
, S
, brw_imm_d(4));
1548 emit_mov(vec16(t2
), brw_imm_d(5));
1549 emit_if_eq_mov(S
, 1, vec16(t2
), 2);
1550 emit_if_eq_mov(S
, 2, vec16(t2
), 4);
1551 emit_if_eq_mov(S
, 3, vec16(t2
), 6);
1555 emit_mov(vec16(t2
), brw_imm_d(0));
1556 emit_if_eq_mov(S
, 5, vec16(t2
), 3);
1557 emit_if_eq_mov(S
, 6, vec16(t2
), 7);
1558 emit_if_eq_mov(S
, 7, vec16(t2
), 1);
1561 emit_mov(vec16(S
), t2
);
1563 texel_fetch(texture_data
[i
]);
1566 #define SAMPLE(x, y) offset(texture_data[x], y)
1567 for (int index
= 3; index
> 0; ) {
1568 /* Since we're doing SIMD16, 4 color channels fits in to 8 registers.
1569 * Counter value of 8 in 'for' loop below is used to interpolate all
1570 * the color components.
1572 for (int k
= 0; k
< 8; k
+= 2)
1573 emit_lrp(vec8(SAMPLE(index
- 1, k
)),
1575 vec8(SAMPLE(index
, k
)),
1576 vec8(SAMPLE(index
- 1, k
)));
1579 for (int k
= 0; k
< 8; k
+= 2)
1580 emit_lrp(vec8(SAMPLE(0, k
)),
1583 vec8(SAMPLE(0, k
)));
1588 * Emit code to look up a value in the texture using the SAMPLE message (which
1589 * does blending of MSAA surfaces).
1592 brw_blorp_blit_program::sample(struct brw_reg dst
)
1594 static const sampler_message_arg args
[2] = {
1595 SAMPLER_MESSAGE_ARG_U_FLOAT
,
1596 SAMPLER_MESSAGE_ARG_V_FLOAT
1599 texture_lookup(dst
, SHADER_OPCODE_TEX
, args
, ARRAY_SIZE(args
));
1603 * Emit code to look up a value in the texture using the SAMPLE_LD message
1604 * (which does a simple texel fetch).
1607 brw_blorp_blit_program::texel_fetch(struct brw_reg dst
)
1609 static const sampler_message_arg gen6_args
[5] = {
1610 SAMPLER_MESSAGE_ARG_U_INT
,
1611 SAMPLER_MESSAGE_ARG_V_INT
,
1612 SAMPLER_MESSAGE_ARG_ZERO_INT
, /* R */
1613 SAMPLER_MESSAGE_ARG_ZERO_INT
, /* LOD */
1614 SAMPLER_MESSAGE_ARG_SI_INT
1616 static const sampler_message_arg gen7_ld_args
[3] = {
1617 SAMPLER_MESSAGE_ARG_U_INT
,
1618 SAMPLER_MESSAGE_ARG_ZERO_INT
, /* LOD */
1619 SAMPLER_MESSAGE_ARG_V_INT
1621 static const sampler_message_arg gen7_ld2dss_args
[3] = {
1622 SAMPLER_MESSAGE_ARG_SI_INT
,
1623 SAMPLER_MESSAGE_ARG_U_INT
,
1624 SAMPLER_MESSAGE_ARG_V_INT
1626 static const sampler_message_arg gen7_ld2dms_args
[4] = {
1627 SAMPLER_MESSAGE_ARG_SI_INT
,
1628 SAMPLER_MESSAGE_ARG_MCS_INT
,
1629 SAMPLER_MESSAGE_ARG_U_INT
,
1630 SAMPLER_MESSAGE_ARG_V_INT
1635 texture_lookup(dst
, SHADER_OPCODE_TXF
, gen6_args
, s_is_zero
? 2 : 5);
1638 switch (key
->tex_layout
) {
1639 case INTEL_MSAA_LAYOUT_IMS
:
1640 /* From the Ivy Bridge PRM, Vol4 Part1 p72 (Multisampled Surface Storage
1643 * If this field is MSFMT_DEPTH_STENCIL
1644 * [a.k.a. INTEL_MSAA_LAYOUT_IMS], the only sampling engine
1645 * messages allowed are "ld2dms", "resinfo", and "sampleinfo".
1647 * So fall through to emit the same message as we use for
1648 * INTEL_MSAA_LAYOUT_CMS.
1650 case INTEL_MSAA_LAYOUT_CMS
:
1651 texture_lookup(dst
, SHADER_OPCODE_TXF_CMS
,
1652 gen7_ld2dms_args
, ARRAY_SIZE(gen7_ld2dms_args
));
1654 case INTEL_MSAA_LAYOUT_UMS
:
1655 texture_lookup(dst
, SHADER_OPCODE_TXF_UMS
,
1656 gen7_ld2dss_args
, ARRAY_SIZE(gen7_ld2dss_args
));
1658 case INTEL_MSAA_LAYOUT_NONE
:
1660 texture_lookup(dst
, SHADER_OPCODE_TXF
, gen7_ld_args
,
1661 ARRAY_SIZE(gen7_ld_args
));
1666 unreachable("Should not get here.");
1671 brw_blorp_blit_program::mcs_fetch()
1673 static const sampler_message_arg gen7_ld_mcs_args
[2] = {
1674 SAMPLER_MESSAGE_ARG_U_INT
,
1675 SAMPLER_MESSAGE_ARG_V_INT
1677 texture_lookup(vec16(mcs_data
), SHADER_OPCODE_TXF_MCS
,
1678 gen7_ld_mcs_args
, ARRAY_SIZE(gen7_ld_mcs_args
));
1682 brw_blorp_blit_program::texture_lookup(struct brw_reg dst
,
1684 const sampler_message_arg
*args
,
1687 struct brw_reg mrf
=
1688 retype(vec16(brw_message_reg(base_mrf
)), BRW_REGISTER_TYPE_UD
);
1689 for (int arg
= 0; arg
< num_args
; ++arg
) {
1690 switch (args
[arg
]) {
1691 case SAMPLER_MESSAGE_ARG_U_FLOAT
:
1692 if (key
->bilinear_filter
)
1693 emit_mov(retype(mrf
, BRW_REGISTER_TYPE_F
),
1694 retype(X
, BRW_REGISTER_TYPE_F
));
1696 emit_mov(retype(mrf
, BRW_REGISTER_TYPE_F
), X
);
1698 case SAMPLER_MESSAGE_ARG_V_FLOAT
:
1699 if (key
->bilinear_filter
)
1700 emit_mov(retype(mrf
, BRW_REGISTER_TYPE_F
),
1701 retype(Y
, BRW_REGISTER_TYPE_F
));
1703 emit_mov(retype(mrf
, BRW_REGISTER_TYPE_F
), Y
);
1705 case SAMPLER_MESSAGE_ARG_U_INT
:
1708 case SAMPLER_MESSAGE_ARG_V_INT
:
1711 case SAMPLER_MESSAGE_ARG_SI_INT
:
1712 /* Note: on Gen7, this code may be reached with s_is_zero==true
1713 * because in Gen7's ld2dss message, the sample index is the first
1714 * argument. When this happens, we need to move a 0 into the
1715 * appropriate message register.
1718 emit_mov(mrf
, brw_imm_ud(0));
1722 case SAMPLER_MESSAGE_ARG_MCS_INT
:
1723 switch (key
->tex_layout
) {
1724 case INTEL_MSAA_LAYOUT_CMS
:
1725 emit_mov(mrf
, mcs_data
);
1727 case INTEL_MSAA_LAYOUT_IMS
:
1728 /* When sampling from an IMS surface, MCS data is not relevant,
1729 * and the hardware ignores it. So don't bother populating it.
1733 /* We shouldn't be trying to send MCS data with any other
1736 assert (!"Unsupported layout for MCS data");
1740 case SAMPLER_MESSAGE_ARG_ZERO_INT
:
1741 emit_mov(mrf
, brw_imm_ud(0));
1747 emit_texture_lookup(retype(dst
, BRW_REGISTER_TYPE_UW
) /* dest */,
1750 mrf
.nr
- base_mrf
/* msg_length */);
1758 #undef SWAP_XY_AND_XPYP
1761 brw_blorp_blit_program::render_target_write()
1763 struct brw_reg mrf_rt_write
=
1764 retype(vec16(brw_message_reg(base_mrf
)), key
->texture_data_type
);
1767 /* If we may have killed pixels, then we need to send R0 and R1 in a header
1768 * so that the render target knows which pixels we killed.
1770 bool use_header
= key
->use_kill
;
1772 /* Copy R0/1 to MRF */
1773 emit_mov(retype(mrf_rt_write
, BRW_REGISTER_TYPE_UD
),
1774 retype(R0
, BRW_REGISTER_TYPE_UD
));
1778 /* Copy texture data to MRFs */
1779 for (int i
= 0; i
< 4; ++i
) {
1780 /* E.g. mov(16) m2.0<1>:f r2.0<8;8,1>:f { Align1, H1 } */
1781 emit_mov(offset(mrf_rt_write
, mrf_offset
),
1782 offset(vec8(texture_data
[0]), 2*i
));
1786 /* Now write to the render target and terminate the thread */
1787 emit_render_target_write(
1789 brw
->gen
< 8 ? base_mrf
: -1,
1790 mrf_offset
/* msg_length. TODO: Should be smaller for non-RGBA formats. */,
1796 brw_blorp_coord_transform_params::setup(GLfloat src0
, GLfloat src1
,
1797 GLfloat dst0
, GLfloat dst1
,
1800 float scale
= (src1
- src0
) / (dst1
- dst0
);
1802 /* When not mirroring a coordinate (say, X), we need:
1803 * src_x - src_x0 = (dst_x - dst_x0 + 0.5) * scale
1805 * src_x = src_x0 + (dst_x - dst_x0 + 0.5) * scale
1807 * blorp program uses "round toward zero" to convert the
1808 * transformed floating point coordinates to integer coordinates,
1809 * whereas the behaviour we actually want is "round to nearest",
1810 * so 0.5 provides the necessary correction.
1813 offset
= src0
+ (-dst0
+ 0.5f
) * scale
;
1815 /* When mirroring X we need:
1816 * src_x - src_x0 = dst_x1 - dst_x - 0.5
1818 * src_x = src_x0 + (dst_x1 -dst_x - 0.5) * scale
1820 multiplier
= -scale
;
1821 offset
= src0
+ (dst1
- 0.5f
) * scale
;
1827 * Determine which MSAA layout the GPU pipeline should be configured for,
1828 * based on the chip generation, the number of samples, and the true layout of
1829 * the image in memory.
1831 inline intel_msaa_layout
1832 compute_msaa_layout_for_pipeline(struct brw_context
*brw
, unsigned num_samples
,
1833 intel_msaa_layout true_layout
)
1835 if (num_samples
<= 1) {
1836 /* When configuring the GPU for non-MSAA, we can still accommodate IMS
1837 * format buffers, by transforming coordinates appropriately.
1839 assert(true_layout
== INTEL_MSAA_LAYOUT_NONE
||
1840 true_layout
== INTEL_MSAA_LAYOUT_IMS
);
1841 return INTEL_MSAA_LAYOUT_NONE
;
1843 assert(true_layout
!= INTEL_MSAA_LAYOUT_NONE
);
1846 /* Prior to Gen7, all MSAA surfaces use IMS layout. */
1847 if (brw
->gen
== 6) {
1848 assert(true_layout
== INTEL_MSAA_LAYOUT_IMS
);
1855 brw_blorp_blit_params::brw_blorp_blit_params(struct brw_context
*brw
,
1856 struct intel_mipmap_tree
*src_mt
,
1857 unsigned src_level
, unsigned src_layer
,
1858 mesa_format src_format
,
1859 struct intel_mipmap_tree
*dst_mt
,
1860 unsigned dst_level
, unsigned dst_layer
,
1861 mesa_format dst_format
,
1862 GLfloat src_x0
, GLfloat src_y0
,
1863 GLfloat src_x1
, GLfloat src_y1
,
1864 GLfloat dst_x0
, GLfloat dst_y0
,
1865 GLfloat dst_x1
, GLfloat dst_y1
,
1867 bool mirror_x
, bool mirror_y
)
1869 src
.set(brw
, src_mt
, src_level
, src_layer
, src_format
, false);
1870 dst
.set(brw
, dst_mt
, dst_level
, dst_layer
, dst_format
, true);
1872 /* Even though we do multisample resolves at the time of the blit, OpenGL
1873 * specification defines them as if they happen at the time of rendering,
1874 * which means that the type of averaging we do during the resolve should
1875 * only depend on the source format; the destination format should be
1876 * ignored. But, specification doesn't seem to be strict about it.
1878 * It has been observed that mulitisample resolves produce slightly better
1879 * looking images when averaging is done using destination format. NVIDIA's
1880 * proprietary OpenGL driver also follow this approach. So, we choose to
1881 * follow it in our driver.
1883 * When multisampling, if the source and destination formats are equal
1884 * (aside from the color space), we choose to blit in sRGB space to get
1885 * this higher quality image.
1887 if (src
.num_samples
> 1 &&
1888 _mesa_get_format_color_encoding(dst_mt
->format
) == GL_SRGB
&&
1889 _mesa_get_srgb_format_linear(src_mt
->format
) ==
1890 _mesa_get_srgb_format_linear(dst_mt
->format
)) {
1891 assert(brw
->format_supported_as_render_target
[dst_mt
->format
]);
1892 dst
.brw_surfaceformat
= brw
->render_target_format
[dst_mt
->format
];
1893 src
.brw_surfaceformat
= brw_format_for_mesa_format(dst_mt
->format
);
1896 /* When doing a multisample resolve of a GL_LUMINANCE32F or GL_INTENSITY32F
1897 * texture, the above code configures the source format for L32_FLOAT or
1898 * I32_FLOAT, and the destination format for R32_FLOAT. On Sandy Bridge,
1899 * the SAMPLE message appears to handle multisampled L32_FLOAT and
1900 * I32_FLOAT textures incorrectly, resulting in blocky artifacts. So work
1901 * around the problem by using a source format of R32_FLOAT. This
1902 * shouldn't affect rendering correctness, since the destination format is
1903 * R32_FLOAT, so only the contents of the red channel matters.
1905 if (brw
->gen
== 6 && src
.num_samples
> 1 && dst
.num_samples
<= 1 &&
1906 src_mt
->format
== dst_mt
->format
&&
1907 dst
.brw_surfaceformat
== BRW_SURFACEFORMAT_R32_FLOAT
) {
1908 src
.brw_surfaceformat
= dst
.brw_surfaceformat
;
1912 memset(&wm_prog_key
, 0, sizeof(wm_prog_key
));
1914 /* texture_data_type indicates the register type that should be used to
1915 * manipulate texture data.
1917 switch (_mesa_get_format_datatype(src_mt
->format
)) {
1918 case GL_UNSIGNED_NORMALIZED
:
1919 case GL_SIGNED_NORMALIZED
:
1921 wm_prog_key
.texture_data_type
= BRW_REGISTER_TYPE_F
;
1923 case GL_UNSIGNED_INT
:
1924 if (src_mt
->format
== MESA_FORMAT_S_UINT8
) {
1925 /* We process stencil as though it's an unsigned normalized color */
1926 wm_prog_key
.texture_data_type
= BRW_REGISTER_TYPE_F
;
1928 wm_prog_key
.texture_data_type
= BRW_REGISTER_TYPE_UD
;
1932 wm_prog_key
.texture_data_type
= BRW_REGISTER_TYPE_D
;
1935 unreachable("Unrecognized blorp format");
1939 /* Gen7's rendering hardware only supports the IMS layout for depth and
1940 * stencil render targets. Blorp always maps its destination surface as
1941 * a color render target (even if it's actually a depth or stencil
1942 * buffer). So if the destination is IMS, we'll have to map it as a
1943 * single-sampled texture and interleave the samples ourselves.
1945 if (dst_mt
->msaa_layout
== INTEL_MSAA_LAYOUT_IMS
)
1946 dst
.num_samples
= 0;
1949 if (dst
.map_stencil_as_y_tiled
&& dst
.num_samples
> 1) {
1950 /* If the destination surface is a W-tiled multisampled stencil buffer
1951 * that we're mapping as Y tiled, then we need to arrange for the WM
1952 * program to run once per sample rather than once per pixel, because
1953 * the memory layout of related samples doesn't match between W and Y
1956 wm_prog_key
.persample_msaa_dispatch
= true;
1959 if (src
.num_samples
> 0 && dst
.num_samples
> 1) {
1960 /* We are blitting from a multisample buffer to a multisample buffer, so
1961 * we must preserve samples within a pixel. This means we have to
1962 * arrange for the WM program to run once per sample rather than once
1965 wm_prog_key
.persample_msaa_dispatch
= true;
1968 /* Scaled blitting or not. */
1969 wm_prog_key
.blit_scaled
=
1970 ((dst_x1
- dst_x0
) == (src_x1
- src_x0
) &&
1971 (dst_y1
- dst_y0
) == (src_y1
- src_y0
)) ? false : true;
1973 /* Scaling factors used for bilinear filtering in multisample scaled
1976 wm_prog_key
.x_scale
= 2.0f
;
1977 wm_prog_key
.y_scale
= src_mt
->num_samples
/ 2.0f
;
1979 if (filter
== GL_LINEAR
&& src
.num_samples
<= 1 && dst
.num_samples
<= 1)
1980 wm_prog_key
.bilinear_filter
= true;
1982 GLenum base_format
= _mesa_get_format_base_format(src_mt
->format
);
1983 if (base_format
!= GL_DEPTH_COMPONENT
&& /* TODO: what about depth/stencil? */
1984 base_format
!= GL_STENCIL_INDEX
&&
1985 src_mt
->num_samples
> 1 && dst_mt
->num_samples
<= 1) {
1986 /* We are downsampling a color buffer, so blend. */
1987 wm_prog_key
.blend
= true;
1990 /* src_samples and dst_samples are the true sample counts */
1991 wm_prog_key
.src_samples
= src_mt
->num_samples
;
1992 wm_prog_key
.dst_samples
= dst_mt
->num_samples
;
1994 /* tex_samples and rt_samples are the sample counts that are set up in
1997 wm_prog_key
.tex_samples
= src
.num_samples
;
1998 wm_prog_key
.rt_samples
= dst
.num_samples
;
2000 /* tex_layout and rt_layout indicate the MSAA layout the GPU pipeline will
2001 * use to access the source and destination surfaces.
2003 wm_prog_key
.tex_layout
=
2004 compute_msaa_layout_for_pipeline(brw
, src
.num_samples
, src
.msaa_layout
);
2005 wm_prog_key
.rt_layout
=
2006 compute_msaa_layout_for_pipeline(brw
, dst
.num_samples
, dst
.msaa_layout
);
2008 /* src_layout and dst_layout indicate the true MSAA layout used by src and
2011 wm_prog_key
.src_layout
= src_mt
->msaa_layout
;
2012 wm_prog_key
.dst_layout
= dst_mt
->msaa_layout
;
2014 wm_prog_key
.src_tiled_w
= src
.map_stencil_as_y_tiled
;
2015 wm_prog_key
.dst_tiled_w
= dst
.map_stencil_as_y_tiled
;
2016 /* Round floating point values to nearest integer to avoid "off by one texel"
2017 * kind of errors when blitting.
2019 x0
= wm_push_consts
.dst_x0
= roundf(dst_x0
);
2020 y0
= wm_push_consts
.dst_y0
= roundf(dst_y0
);
2021 x1
= wm_push_consts
.dst_x1
= roundf(dst_x1
);
2022 y1
= wm_push_consts
.dst_y1
= roundf(dst_y1
);
2023 wm_push_consts
.rect_grid_x1
= (minify(src_mt
->logical_width0
, src_level
) *
2024 wm_prog_key
.x_scale
- 1.0f
);
2025 wm_push_consts
.rect_grid_y1
= (minify(src_mt
->logical_height0
, src_level
) *
2026 wm_prog_key
.y_scale
- 1.0f
);
2028 wm_push_consts
.x_transform
.setup(src_x0
, src_x1
, dst_x0
, dst_x1
, mirror_x
);
2029 wm_push_consts
.y_transform
.setup(src_y0
, src_y1
, dst_y0
, dst_y1
, mirror_y
);
2031 if (dst
.num_samples
<= 1 && dst_mt
->num_samples
> 1) {
2032 /* We must expand the rectangle we send through the rendering pipeline,
2033 * to account for the fact that we are mapping the destination region as
2034 * single-sampled when it is in fact multisampled. We must also align
2035 * it to a multiple of the multisampling pattern, because the
2036 * differences between multisampled and single-sampled surface formats
2037 * will mean that pixels are scrambled within the multisampling pattern.
2038 * TODO: what if this makes the coordinates too large?
2040 * Note: this only works if the destination surface uses the IMS layout.
2041 * If it's UMS, then we have no choice but to set up the rendering
2042 * pipeline as multisampled.
2044 assert(dst_mt
->msaa_layout
== INTEL_MSAA_LAYOUT_IMS
);
2045 switch (dst_mt
->num_samples
) {
2047 x0
= ROUND_DOWN_TO(x0
* 2, 4);
2048 y0
= ROUND_DOWN_TO(y0
* 2, 4);
2049 x1
= ALIGN(x1
* 2, 4);
2050 y1
= ALIGN(y1
* 2, 4);
2053 x0
= ROUND_DOWN_TO(x0
* 4, 8);
2054 y0
= ROUND_DOWN_TO(y0
* 2, 4);
2055 x1
= ALIGN(x1
* 4, 8);
2056 y1
= ALIGN(y1
* 2, 4);
2059 unreachable("Unrecognized sample count in brw_blorp_blit_params ctor");
2061 wm_prog_key
.use_kill
= true;
2064 if (dst
.map_stencil_as_y_tiled
) {
2065 /* We must modify the rectangle we send through the rendering pipeline
2066 * (and the size and x/y offset of the destination surface), to account
2067 * for the fact that we are mapping it as Y-tiled when it is in fact
2070 * Both Y tiling and W tiling can be understood as organizations of
2071 * 32-byte sub-tiles; within each 32-byte sub-tile, the layout of pixels
2072 * is different, but the layout of the 32-byte sub-tiles within the 4k
2073 * tile is the same (8 sub-tiles across by 16 sub-tiles down, in
2074 * column-major order). In Y tiling, the sub-tiles are 16 bytes wide
2075 * and 2 rows high; in W tiling, they are 8 bytes wide and 4 rows high.
2077 * Therefore, to account for the layout differences within the 32-byte
2078 * sub-tiles, we must expand the rectangle so the X coordinates of its
2079 * edges are multiples of 8 (the W sub-tile width), and its Y
2080 * coordinates of its edges are multiples of 4 (the W sub-tile height).
2081 * Then we need to scale the X and Y coordinates of the rectangle to
2082 * account for the differences in aspect ratio between the Y and W
2083 * sub-tiles. We need to modify the layer width and height similarly.
2085 * A correction needs to be applied when MSAA is in use: since
2086 * INTEL_MSAA_LAYOUT_IMS uses an interleaving pattern whose height is 4,
2087 * we need to align the Y coordinates to multiples of 8, so that when
2088 * they are divided by two they are still multiples of 4.
2090 * Note: Since the x/y offset of the surface will be applied using the
2091 * SURFACE_STATE command packet, it will be invisible to the swizzling
2092 * code in the shader; therefore it needs to be in a multiple of the
2093 * 32-byte sub-tile size. Fortunately it is, since the sub-tile is 8
2094 * pixels wide and 4 pixels high (when viewed as a W-tiled stencil
2095 * buffer), and the miplevel alignment used for stencil buffers is 8
2096 * pixels horizontally and either 4 or 8 pixels vertically (see
2097 * intel_horizontal_texture_alignment_unit() and
2098 * intel_vertical_texture_alignment_unit()).
2100 * Note: Also, since the SURFACE_STATE command packet can only apply
2101 * offsets that are multiples of 4 pixels horizontally and 2 pixels
2102 * vertically, it is important that the offsets will be multiples of
2103 * these sizes after they are converted into Y-tiled coordinates.
2104 * Fortunately they will be, since we know from above that the offsets
2105 * are a multiple of the 32-byte sub-tile size, and in Y-tiled
2106 * coordinates the sub-tile is 16 pixels wide and 2 pixels high.
2108 * TODO: what if this makes the coordinates (or the texture size) too
2111 const unsigned x_align
= 8, y_align
= dst
.num_samples
!= 0 ? 8 : 4;
2112 x0
= ROUND_DOWN_TO(x0
, x_align
) * 2;
2113 y0
= ROUND_DOWN_TO(y0
, y_align
) / 2;
2114 x1
= ALIGN(x1
, x_align
) * 2;
2115 y1
= ALIGN(y1
, y_align
) / 2;
2116 dst
.width
= ALIGN(dst
.width
, x_align
) * 2;
2117 dst
.height
= ALIGN(dst
.height
, y_align
) / 2;
2120 wm_prog_key
.use_kill
= true;
2123 if (src
.map_stencil_as_y_tiled
) {
2124 /* We must modify the size and x/y offset of the source surface to
2125 * account for the fact that we are mapping it as Y-tiled when it is in
2128 * See the comments above concerning x/y offset alignment for the
2129 * destination surface.
2131 * TODO: what if this makes the texture size too large?
2133 const unsigned x_align
= 8, y_align
= src
.num_samples
!= 0 ? 8 : 4;
2134 src
.width
= ALIGN(src
.width
, x_align
) * 2;
2135 src
.height
= ALIGN(src
.height
, y_align
) / 2;
2142 brw_blorp_blit_params::get_wm_prog(struct brw_context
*brw
,
2143 brw_blorp_prog_data
**prog_data
) const
2145 uint32_t prog_offset
= 0;
2146 if (!brw_search_cache(&brw
->cache
, BRW_CACHE_BLORP_BLIT_PROG
,
2147 &this->wm_prog_key
, sizeof(this->wm_prog_key
),
2148 &prog_offset
, prog_data
)) {
2149 brw_blorp_blit_program
prog(brw
, &this->wm_prog_key
,
2150 INTEL_DEBUG
& DEBUG_BLORP
);
2151 GLuint program_size
;
2152 const GLuint
*program
= prog
.compile(brw
, &program_size
);
2153 brw_upload_cache(&brw
->cache
, BRW_CACHE_BLORP_BLIT_PROG
,
2154 &this->wm_prog_key
, sizeof(this->wm_prog_key
),
2155 program
, program_size
,
2156 &prog
.prog_data
, sizeof(prog
.prog_data
),
2157 &prog_offset
, prog_data
);