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/teximage.h"
26 #include "glsl/ralloc.h"
28 #include "intel_fbo.h"
30 #include "brw_blorp.h"
31 #include "brw_context.h"
33 #include "brw_state.h"
37 * Helper function for handling mirror image blits.
39 * If coord0 > coord1, swap them and invert the "mirror" boolean.
42 fixup_mirroring(bool &mirror
, GLint
&coord0
, GLint
&coord1
)
44 if (coord0
> coord1
) {
54 try_blorp_blit(struct intel_context
*intel
,
55 GLint srcX0
, GLint srcY0
, GLint srcX1
, GLint srcY1
,
56 GLint dstX0
, GLint dstY0
, GLint dstX1
, GLint dstY1
,
57 GLenum filter
, GLbitfield buffer_bit
)
59 struct gl_context
*ctx
= &intel
->ctx
;
61 /* Sync up the state of window system buffers. We need to do this before
62 * we go looking for the buffers.
64 intel_prepare_render(intel
);
67 const struct gl_framebuffer
*read_fb
= ctx
->ReadBuffer
;
68 const struct gl_framebuffer
*draw_fb
= ctx
->DrawBuffer
;
69 struct gl_renderbuffer
*src_rb
;
70 struct gl_renderbuffer
*dst_rb
;
72 case GL_COLOR_BUFFER_BIT
:
73 src_rb
= read_fb
->_ColorReadBuffer
;
76 draw_fb
->_ColorDrawBufferIndexes
[0]].Renderbuffer
;
78 case GL_DEPTH_BUFFER_BIT
:
79 src_rb
= read_fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
80 dst_rb
= draw_fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
82 case GL_STENCIL_BUFFER_BIT
:
83 src_rb
= read_fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
84 dst_rb
= draw_fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
91 if (!src_rb
) return false;
92 struct intel_renderbuffer
*src_irb
= intel_renderbuffer(src_rb
);
93 struct intel_mipmap_tree
*src_mt
= src_irb
->mt
;
94 if (!src_mt
) return false;
95 if (buffer_bit
== GL_STENCIL_BUFFER_BIT
&& src_mt
->stencil_mt
)
96 src_mt
= src_mt
->stencil_mt
;
97 switch (src_mt
->format
) {
98 case MESA_FORMAT_ARGB8888
:
99 case MESA_FORMAT_X8_Z24
:
101 break; /* Supported */
103 /* Unsupported format.
105 * TODO: need to support all formats that are allowed as multisample
111 /* Validate destination */
112 if (!dst_rb
) return false;
113 struct intel_renderbuffer
*dst_irb
= intel_renderbuffer(dst_rb
);
114 struct intel_mipmap_tree
*dst_mt
= dst_irb
->mt
;
115 if (!dst_mt
) return false;
116 if (buffer_bit
== GL_STENCIL_BUFFER_BIT
&& dst_mt
->stencil_mt
)
117 dst_mt
= dst_mt
->stencil_mt
;
118 switch (dst_mt
->format
) {
119 case MESA_FORMAT_ARGB8888
:
120 case MESA_FORMAT_X8_Z24
:
122 break; /* Supported */
124 /* Unsupported format.
126 * TODO: need to support all formats that are allowed as multisample
132 /* Account for the fact that in the system framebuffer, the origin is at
135 if (read_fb
->Name
== 0) {
136 srcY0
= read_fb
->Height
- srcY0
;
137 srcY1
= read_fb
->Height
- srcY1
;
139 if (draw_fb
->Name
== 0) {
140 dstY0
= draw_fb
->Height
- dstY0
;
141 dstY1
= draw_fb
->Height
- dstY1
;
144 /* Detect if the blit needs to be mirrored */
145 bool mirror_x
= false, mirror_y
= false;
146 fixup_mirroring(mirror_x
, srcX0
, srcX1
);
147 fixup_mirroring(mirror_x
, dstX0
, dstX1
);
148 fixup_mirroring(mirror_y
, srcY0
, srcY1
);
149 fixup_mirroring(mirror_y
, dstY0
, dstY1
);
151 /* Make sure width and height match */
152 GLsizei width
= srcX1
- srcX0
;
153 GLsizei height
= srcY1
- srcY0
;
154 if (width
!= dstX1
- dstX0
) return false;
155 if (height
!= dstY1
- dstY0
) return false;
157 /* Make sure width and height don't need to be clipped or scissored.
158 * TODO: support clipping and scissoring.
160 if (srcX0
< 0 || (GLuint
) srcX1
> read_fb
->Width
) return false;
161 if (srcY0
< 0 || (GLuint
) srcY1
> read_fb
->Height
) return false;
162 if (dstX0
< 0 || (GLuint
) dstX1
> draw_fb
->Width
) return false;
163 if (dstY0
< 0 || (GLuint
) dstY1
> draw_fb
->Height
) return false;
164 if (ctx
->Scissor
.Enabled
) return false;
166 /* Get ready to blit. This includes depth resolving the src and dst
167 * buffers if necessary.
169 intel_renderbuffer_resolve_depth(intel
, src_irb
);
170 intel_renderbuffer_resolve_depth(intel
, dst_irb
);
173 brw_blorp_blit_params
params(src_mt
, dst_mt
,
174 srcX0
, srcY0
, dstX0
, dstY0
, dstX1
, dstY1
,
176 brw_blorp_exec(intel
, ¶ms
);
178 /* Mark the dst buffer as needing a HiZ resolve if necessary. */
179 intel_renderbuffer_set_needs_hiz_resolve(dst_irb
);
185 brw_blorp_framebuffer(struct intel_context
*intel
,
186 GLint srcX0
, GLint srcY0
, GLint srcX1
, GLint srcY1
,
187 GLint dstX0
, GLint dstY0
, GLint dstX1
, GLint dstY1
,
188 GLbitfield mask
, GLenum filter
)
190 /* BLORP is not supported before Gen6. */
194 static GLbitfield buffer_bits
[] = {
197 GL_STENCIL_BUFFER_BIT
,
200 for (unsigned int i
= 0; i
< ARRAY_SIZE(buffer_bits
); ++i
) {
201 if ((mask
& buffer_bits
[i
]) &&
202 try_blorp_blit(intel
,
203 srcX0
, srcY0
, srcX1
, srcY1
,
204 dstX0
, dstY0
, dstX1
, dstY1
,
205 filter
, buffer_bits
[i
])) {
206 mask
&= ~buffer_bits
[i
];
215 * Enum to specify the order of arguments in a sampler message
217 enum sampler_message_arg
219 SAMPLER_MESSAGE_ARG_U_FLOAT
,
220 SAMPLER_MESSAGE_ARG_V_FLOAT
,
221 SAMPLER_MESSAGE_ARG_U_INT
,
222 SAMPLER_MESSAGE_ARG_V_INT
,
223 SAMPLER_MESSAGE_ARG_SI_INT
,
224 SAMPLER_MESSAGE_ARG_ZERO_INT
,
228 * Generator for WM programs used in BLORP blits.
230 * The bulk of the work done by the WM program is to wrap and unwrap the
231 * coordinate transformations used by the hardware to store surfaces in
232 * memory. The hardware transforms a pixel location (X, Y, S) (where S is the
233 * sample index for a multisampled surface) to a memory offset by the
234 * following formulas:
236 * offset = tile(tiling_format, encode_msaa(num_samples, X, Y, S))
237 * (X, Y, S) = decode_msaa(num_samples, detile(tiling_format, offset))
239 * For a single-sampled surface, encode_msaa() and decode_msaa are the
242 * encode_msaa(1, X, Y, 0) = (X, Y)
243 * decode_msaa(1, X, Y) = (X, Y, 0)
245 * For a 4x multisampled surface, encode_msaa() embeds the sample number into
246 * bit 1 of the X and Y coordinates:
248 * encode_msaa(4, X, Y, S) = (X', Y')
249 * where X' = (X & ~0b1) << 1 | (S & 0b1) << 1 | (X & 0b1)
250 * Y' = (Y & ~0b1 ) << 1 | (S & 0b10) | (Y & 0b1)
251 * decode_msaa(4, X, Y) = (X', Y', S)
252 * where X' = (X & ~0b11) >> 1 | (X & 0b1)
253 * Y' = (Y & ~0b11) >> 1 | (Y & 0b1)
254 * S = (Y & 0b10) | (X & 0b10) >> 1
256 * For X tiling, tile() combines together the low-order bits of the X and Y
257 * coordinates in the pattern 0byyyxxxxxxxxx, creating 4k tiles that are 512
258 * bytes wide and 8 rows high:
260 * tile(x_tiled, X, Y) = A
261 * where A = tile_num << 12 | offset
262 * tile_num = (Y >> 3) * tile_pitch + (X' >> 9)
263 * offset = (Y & 0b111) << 9
264 * | (X & 0b111111111)
266 * detile(x_tiled, A) = (X, Y)
268 * Y = (tile_num / tile_pitch) << 3
269 * | (A & 0b111000000000) >> 9
270 * X' = (tile_num % tile_pitch) << 9
271 * | (A & 0b111111111)
273 * (In all tiling formulas, cpp is the number of bytes occupied by a single
274 * sample ("chars per pixel"), and tile_pitch is the number of 4k tiles
275 * required to fill the width of the surface).
277 * For Y tiling, tile() combines together the low-order bits of the X and Y
278 * coordinates in the pattern 0bxxxyyyyyxxxx, creating 4k tiles that are 128
279 * bytes wide and 32 rows high:
281 * tile(y_tiled, X, Y) = A
282 * where A = tile_num << 12 | offset
283 * tile_num = (Y >> 5) * tile_pitch + (X' >> 7)
284 * offset = (X' & 0b1110000) << 5
285 * | (Y' & 0b11111) << 4
288 * detile(y_tiled, A) = (X, Y)
290 * Y = (tile_num / tile_pitch) << 5
291 * | (A & 0b111110000) >> 4
292 * X' = (tile_num % tile_pitch) << 7
293 * | (A & 0b111000000000) >> 5
296 * For W tiling, tile() combines together the low-order bits of the X and Y
297 * coordinates in the pattern 0bxxxyyyyxyxyx, creating 4k tiles that are 64
298 * bytes wide and 64 rows high (note that W tiling is only used for stencil
299 * buffers, which always have cpp = 1):
301 * tile(w_tiled, X, Y) = A
302 * where A = tile_num << 12 | offset
303 * tile_num = (Y >> 6) * tile_pitch + (X' >> 6)
304 * offset = (X' & 0b111000) << 6
305 * | (Y & 0b111100) << 3
306 * | (X' & 0b100) << 2
312 * detile(w_tiled, A) = (X, Y)
313 * where X = X' / cpp = X'
314 * Y = (tile_num / tile_pitch) << 6
315 * | (A & 0b111100000) >> 3
316 * | (A & 0b1000) >> 2
318 * X' = (tile_num % tile_pitch) << 6
319 * | (A & 0b111000000000) >> 6
320 * | (A & 0b10000) >> 2
324 * Finally, for a non-tiled surface, tile() simply combines together the X and
325 * Y coordinates in the natural way:
327 * tile(untiled, X, Y) = A
328 * where A = Y * pitch + X'
330 * detile(untiled, A) = (X, Y)
335 * (In these formulas, pitch is the number of bytes occupied by a single row
338 class brw_blorp_blit_program
341 brw_blorp_blit_program(struct brw_context
*brw
,
342 const brw_blorp_blit_prog_key
*key
);
343 ~brw_blorp_blit_program();
345 const GLuint
*compile(struct brw_context
*brw
, GLuint
*program_size
);
347 brw_blorp_prog_data prog_data
;
351 void alloc_push_const_regs(int base_reg
);
352 void compute_frag_coords();
353 void translate_tiling(bool old_tiled_w
, bool new_tiled_w
);
354 void encode_msaa(unsigned num_samples
);
355 void decode_msaa(unsigned num_samples
);
356 void kill_if_outside_dst_rect();
357 void translate_dst_to_src();
358 void single_to_blend();
361 void expand_to_32_bits(struct brw_reg src
, struct brw_reg dst
);
362 void texture_lookup(GLuint msg_type
, const sampler_message_arg
*args
,
364 void render_target_write();
367 struct brw_context
*brw
;
368 const brw_blorp_blit_prog_key
*key
;
369 struct brw_compile func
;
371 /* Thread dispatch header */
374 /* Pixel X/Y coordinates (always in R1). */
378 struct brw_reg dst_x0
;
379 struct brw_reg dst_x1
;
380 struct brw_reg dst_y0
;
381 struct brw_reg dst_y1
;
383 struct brw_reg multiplier
;
384 struct brw_reg offset
;
385 } x_transform
, y_transform
;
387 /* Data returned from texture lookup (4 vec16's) */
388 struct brw_reg Rdata
;
390 /* X coordinates. We have two of them so that we can perform coordinate
391 * transformations easily.
393 struct brw_reg x_coords
[2];
395 /* Y coordinates. We have two of them so that we can perform coordinate
396 * transformations easily.
398 struct brw_reg y_coords
[2];
400 /* Which element of x_coords and y_coords is currently in use.
404 /* True if, at the point in the program currently being compiled, the
405 * sample index is known to be zero.
409 /* Register storing the sample index when s_is_zero is false. */
410 struct brw_reg sample_index
;
416 /* MRF used for sampling and render target writes */
420 brw_blorp_blit_program::brw_blorp_blit_program(
421 struct brw_context
*brw
,
422 const brw_blorp_blit_prog_key
*key
)
423 : mem_ctx(ralloc_context(NULL
)),
427 brw_init_compile(brw
, &func
, mem_ctx
);
430 brw_blorp_blit_program::~brw_blorp_blit_program()
432 ralloc_free(mem_ctx
);
436 brw_blorp_blit_program::compile(struct brw_context
*brw
,
437 GLuint
*program_size
)
440 if (key
->dst_tiled_w
&& key
->rt_samples
> 0) {
441 /* If the destination image is W tiled and multisampled, then the thread
442 * must be dispatched once per sample, not once per pixel. This is
443 * necessary because after conversion between W and Y tiling, there's no
444 * guarantee that all samples corresponding to a single pixel will still
447 assert(key
->persample_msaa_dispatch
);
451 /* We are blending, which means we'll be using a SAMPLE message, which
452 * causes the hardware to pick up the all of the samples corresponding
453 * to this pixel and average them together. Since we'll be relying on
454 * the hardware to find all of the samples and combine them together,
455 * the surface state for the texture must be configured with the correct
456 * tiling and sample count.
458 assert(!key
->src_tiled_w
);
459 assert(key
->tex_samples
== key
->src_samples
);
460 assert(key
->tex_samples
> 0);
463 if (key
->persample_msaa_dispatch
) {
464 /* It only makes sense to do persample dispatch if the render target is
465 * configured as multisampled.
467 assert(key
->rt_samples
> 0);
470 /* Set up prog_data */
471 memset(&prog_data
, 0, sizeof(prog_data
));
472 prog_data
.persample_msaa_dispatch
= key
->persample_msaa_dispatch
;
474 brw_set_compression_control(&func
, BRW_COMPRESSION_NONE
);
477 compute_frag_coords();
479 /* Render target and texture hardware don't support W tiling. */
480 const bool rt_tiled_w
= false;
481 const bool tex_tiled_w
= false;
483 /* The address that data will be written to is determined by the
484 * coordinates supplied to the WM thread and the tiling and sample count of
485 * the render target, according to the formula:
487 * (X, Y, S) = decode_msaa(rt_samples, detile(rt_tiling, offset))
489 * If the actual tiling and sample count of the destination surface are not
490 * the same as the configuration of the render target, then these
491 * coordinates are wrong and we have to adjust them to compensate for the
494 if (rt_tiled_w
!= key
->dst_tiled_w
||
495 key
->rt_samples
!= key
->dst_samples
) {
496 encode_msaa(key
->rt_samples
);
497 /* Now (X, Y) = detile(rt_tiling, offset) */
498 translate_tiling(rt_tiled_w
, key
->dst_tiled_w
);
499 /* Now (X, Y) = detile(dst_tiling, offset) */
500 decode_msaa(key
->dst_samples
);
503 /* Now (X, Y, S) = decode_msaa(dst_samples, detile(dst_tiling, offset)).
505 * That is: X, Y and S now contain the true coordinates and sample index of
506 * the data that the WM thread should output.
508 * If we need to kill pixels that are outside the destination rectangle,
509 * now is the time to do it.
513 kill_if_outside_dst_rect();
515 /* Next, apply a translation to obtain coordinates in the source image. */
516 translate_dst_to_src();
518 /* If the source image is not multisampled, then we want to fetch sample
519 * number 0, because that's the only sample there is.
521 if (key
->src_samples
== 0)
524 /* X, Y, and S are now the coordinates of the pixel in the source image
525 * that we want to texture from. Exception: if we are blending, then S is
526 * irrelevant, because we are going to fetch all samples.
532 /* We aren't blending, which means we just want to fetch a single sample
533 * from the source surface. The address that we want to fetch from is
534 * related to the X, Y and S values according to the formula:
536 * (X, Y, S) = decode_msaa(src_samples, detile(src_tiling, offset)).
538 * If the actual tiling and sample count of the source surface are not
539 * the same as the configuration of the texture, then we need to adjust
540 * the coordinates to compensate for the difference.
542 if (tex_tiled_w
!= key
->src_tiled_w
||
543 key
->tex_samples
!= key
->src_samples
) {
544 encode_msaa(key
->src_samples
);
545 /* Now (X, Y) = detile(src_tiling, offset) */
546 translate_tiling(key
->src_tiled_w
, tex_tiled_w
);
547 /* Now (X, Y) = detile(tex_tiling, offset) */
548 decode_msaa(key
->tex_samples
);
551 /* Now (X, Y, S) = decode_msaa(tex_samples, detile(tex_tiling, offset)).
553 * In other words: X, Y, and S now contain values which, when passed to
554 * the texturing unit, will cause data to be read from the correct
555 * memory location. So we can fetch the texel now.
560 /* Finally, write the fetched (or blended) value to the render target and
561 * terminate the thread.
563 render_target_write();
564 return brw_get_program(&func
, program_size
);
568 brw_blorp_blit_program::alloc_push_const_regs(int base_reg
)
570 #define CONST_LOC(name) offsetof(brw_blorp_wm_push_constants, name)
571 #define ALLOC_REG(name) \
573 brw_uw1_reg(BRW_GENERAL_REGISTER_FILE, base_reg, CONST_LOC(name) / 2)
579 ALLOC_REG(x_transform
.multiplier
);
580 ALLOC_REG(x_transform
.offset
);
581 ALLOC_REG(y_transform
.multiplier
);
582 ALLOC_REG(y_transform
.offset
);
588 brw_blorp_blit_program::alloc_regs()
591 this->R0
= retype(brw_vec8_grf(reg
++, 0), BRW_REGISTER_TYPE_UW
);
592 this->R1
= retype(brw_vec8_grf(reg
++, 0), BRW_REGISTER_TYPE_UW
);
593 prog_data
.first_curbe_grf
= reg
;
594 alloc_push_const_regs(reg
);
595 reg
+= BRW_BLORP_NUM_PUSH_CONST_REGS
;
596 this->Rdata
= vec16(brw_vec8_grf(reg
, 0)); reg
+= 8;
597 for (int i
= 0; i
< 2; ++i
) {
599 = vec16(retype(brw_vec8_grf(reg
++, 0), BRW_REGISTER_TYPE_UW
));
601 = vec16(retype(brw_vec8_grf(reg
++, 0), BRW_REGISTER_TYPE_UW
));
603 this->xy_coord_index
= 0;
605 = vec16(retype(brw_vec8_grf(reg
++, 0), BRW_REGISTER_TYPE_UW
));
606 this->t1
= vec16(retype(brw_vec8_grf(reg
++, 0), BRW_REGISTER_TYPE_UW
));
607 this->t2
= vec16(retype(brw_vec8_grf(reg
++, 0), BRW_REGISTER_TYPE_UW
));
610 this->base_mrf
= mrf
;
613 /* In the code that follows, X and Y can be used to quickly refer to the
614 * active elements of x_coords and y_coords, and Xp and Yp ("X prime" and "Y
615 * prime") to the inactive elements.
617 * S can be used to quickly refer to sample_index.
619 #define X x_coords[xy_coord_index]
620 #define Y y_coords[xy_coord_index]
621 #define Xp x_coords[!xy_coord_index]
622 #define Yp y_coords[!xy_coord_index]
623 #define S sample_index
625 /* Quickly swap the roles of (X, Y) and (Xp, Yp). Saves us from having to do
626 * MOVs to transfor (Xp, Yp) to (X, Y) after a coordinate transformation.
628 #define SWAP_XY_AND_XPYP() xy_coord_index = !xy_coord_index;
631 * Emit code to compute the X and Y coordinates of the pixels being rendered
632 * by this WM invocation.
634 * Assuming the render target is set up for Y tiling, these (X, Y) values are
635 * related to the address offset where outputs will be written by the formula:
637 * (X, Y, S) = decode_msaa(detile(offset)).
639 * (See brw_blorp_blit_program).
642 brw_blorp_blit_program::compute_frag_coords()
644 /* R1.2[15:0] = X coordinate of upper left pixel of subspan 0 (pixel 0)
645 * R1.3[15:0] = X coordinate of upper left pixel of subspan 1 (pixel 4)
646 * R1.4[15:0] = X coordinate of upper left pixel of subspan 2 (pixel 8)
647 * R1.5[15:0] = X coordinate of upper left pixel of subspan 3 (pixel 12)
649 * Pixels within a subspan are laid out in this arrangement:
653 * So, to compute the coordinates of each pixel, we need to read every 2nd
654 * 16-bit value (vstride=2) from R1, starting at the 4th 16-bit value
655 * (suboffset=4), and duplicate each value 4 times (hstride=0, width=4).
656 * In other words, the data we want to access is R1.4<2;4,0>UW.
658 * Then, we need to add the repeating sequence (0, 1, 0, 1, ...) to the
659 * result, since pixels n+1 and n+3 are in the right half of the subspan.
661 brw_ADD(&func
, X
, stride(suboffset(R1
, 4), 2, 4, 0), brw_imm_v(0x10101010));
663 /* Similarly, Y coordinates for subspans come from R1.2[31:16] through
664 * R1.5[31:16], so to get pixel Y coordinates we need to start at the 5th
665 * 16-bit value instead of the 4th (R1.5<2;4,0>UW instead of
668 * And we need to add the repeating sequence (0, 0, 1, 1, ...), since
669 * pixels n+2 and n+3 are in the bottom half of the subspan.
671 brw_ADD(&func
, Y
, stride(suboffset(R1
, 5), 2, 4, 0), brw_imm_v(0x11001100));
673 if (key
->persample_msaa_dispatch
) {
674 /* The WM will be run in MSDISPMODE_PERSAMPLE with num_samples > 0.
675 * Therefore, subspan 0 will represent sample 0, subspan 1 will
676 * represent sample 1, and so on.
678 * So we need to populate S with the sequence (0, 0, 0, 0, 1, 1, 1, 1,
679 * 2, 2, 2, 2, 3, 3, 3, 3). The easiest way to do this is to populate a
680 * temporary variable with the sequence (0, 1, 2, 3), and then copy from
681 * it using vstride=1, width=4, hstride=0.
683 * TODO: implement the necessary calculation for 8x multisampling.
685 brw_MOV(&func
, t1
, brw_imm_v(0x3210));
686 brw_MOV(&func
, S
, stride(t1
, 1, 4, 0));
689 /* Either the destination surface is single-sampled, or the WM will be
690 * run in MSDISPMODE_PERPIXEL (which causes a single fragment dispatch
691 * per pixel). In either case, it's not meaningful to compute a sample
692 * value. Just set it to 0.
699 * Emit code to compensate for the difference between Y and W tiling.
701 * This code modifies the X and Y coordinates according to the formula:
703 * (X', Y') = detile(new_tiling, tile(old_tiling, X, Y))
705 * (See brw_blorp_blit_program).
707 * It can only translate between W and Y tiling, so new_tiling and old_tiling
708 * are booleans where true represents W tiling and false represents Y tiling.
711 brw_blorp_blit_program::translate_tiling(bool old_tiled_w
, bool new_tiled_w
)
713 if (old_tiled_w
== new_tiled_w
)
717 /* Given X and Y coordinates that describe an address using Y tiling,
718 * translate to the X and Y coordinates that describe the same address
721 * If we break down the low order bits of X and Y, using a
722 * single letter to represent each low-order bit:
724 * X = A << 7 | 0bBCDEFGH
725 * Y = J << 5 | 0bKLMNP (1)
727 * Then we can apply the Y tiling formula to see the memory offset being
730 * offset = (J * tile_pitch + A) << 12 | 0bBCDKLMNPEFGH (2)
732 * If we apply the W detiling formula to this memory location, that the
733 * corresponding X' and Y' coordinates are:
735 * X' = A << 6 | 0bBCDPFH (3)
736 * Y' = J << 6 | 0bKLMNEG
738 * Combining (1) and (3), we see that to transform (X, Y) to (X', Y'),
739 * we need to make the following computation:
741 * X' = (X & ~0b1011) >> 1 | (Y & 0b1) << 2 | X & 0b1 (4)
742 * Y' = (Y & ~0b1) << 1 | (X & 0b1000) >> 2 | (X & 0b10) >> 1
744 brw_AND(&func
, t1
, X
, brw_imm_uw(0xfff4)); /* X & ~0b1011 */
745 brw_SHR(&func
, t1
, t1
, brw_imm_uw(1)); /* (X & ~0b1011) >> 1 */
746 brw_AND(&func
, t2
, Y
, brw_imm_uw(1)); /* Y & 0b1 */
747 brw_SHL(&func
, t2
, t2
, brw_imm_uw(2)); /* (Y & 0b1) << 2 */
748 brw_OR(&func
, t1
, t1
, t2
); /* (X & ~0b1011) >> 1 | (Y & 0b1) << 2 */
749 brw_AND(&func
, t2
, X
, brw_imm_uw(1)); /* X & 0b1 */
750 brw_OR(&func
, Xp
, t1
, t2
);
751 brw_AND(&func
, t1
, Y
, brw_imm_uw(0xfffe)); /* Y & ~0b1 */
752 brw_SHL(&func
, t1
, t1
, brw_imm_uw(1)); /* (Y & ~0b1) << 1 */
753 brw_AND(&func
, t2
, X
, brw_imm_uw(8)); /* X & 0b1000 */
754 brw_SHR(&func
, t2
, t2
, brw_imm_uw(2)); /* (X & 0b1000) >> 2 */
755 brw_OR(&func
, t1
, t1
, t2
); /* (Y & ~0b1) << 1 | (X & 0b1000) >> 2 */
756 brw_AND(&func
, t2
, X
, brw_imm_uw(2)); /* X & 0b10 */
757 brw_SHR(&func
, t2
, t2
, brw_imm_uw(1)); /* (X & 0b10) >> 1 */
758 brw_OR(&func
, Yp
, t1
, t2
);
761 /* Applying the same logic as above, but in reverse, we obtain the
764 * X' = (X & ~0b101) << 1 | (Y & 0b10) << 2 | (Y & 0b1) << 1 | X & 0b1
765 * Y' = (Y & ~0b11) >> 1 | (X & 0b100) >> 2
767 brw_AND(&func
, t1
, X
, brw_imm_uw(0xfffa)); /* X & ~0b101 */
768 brw_SHL(&func
, t1
, t1
, brw_imm_uw(1)); /* (X & ~0b101) << 1 */
769 brw_AND(&func
, t2
, Y
, brw_imm_uw(2)); /* Y & 0b10 */
770 brw_SHL(&func
, t2
, t2
, brw_imm_uw(2)); /* (Y & 0b10) << 2 */
771 brw_OR(&func
, t1
, t1
, t2
); /* (X & ~0b101) << 1 | (Y & 0b10) << 2 */
772 brw_AND(&func
, t2
, Y
, brw_imm_uw(1)); /* Y & 0b1 */
773 brw_SHL(&func
, t2
, t2
, brw_imm_uw(1)); /* (Y & 0b1) << 1 */
774 brw_OR(&func
, t1
, t1
, t2
); /* (X & ~0b101) << 1 | (Y & 0b10) << 2
776 brw_AND(&func
, t2
, X
, brw_imm_uw(1)); /* X & 0b1 */
777 brw_OR(&func
, Xp
, t1
, t2
);
778 brw_AND(&func
, t1
, Y
, brw_imm_uw(0xfffc)); /* Y & ~0b11 */
779 brw_SHR(&func
, t1
, t1
, brw_imm_uw(1)); /* (Y & ~0b11) >> 1 */
780 brw_AND(&func
, t2
, X
, brw_imm_uw(4)); /* X & 0b100 */
781 brw_SHR(&func
, t2
, t2
, brw_imm_uw(2)); /* (X & 0b100) >> 2 */
782 brw_OR(&func
, Yp
, t1
, t2
);
788 * Emit code to compensate for the difference between MSAA and non-MSAA
791 * This code modifies the X and Y coordinates according to the formula:
793 * (X', Y') = encode_msaa_4x(X, Y, S)
795 * (See brw_blorp_blit_program).
798 brw_blorp_blit_program::encode_msaa(unsigned num_samples
)
800 if (num_samples
== 0) {
801 /* No translation necessary. */
803 /* encode_msaa_4x(X, Y, S) = (X', Y')
804 * where X' = (X & ~0b1) << 1 | (S & 0b1) << 1 | (X & 0b1)
805 * Y' = (Y & ~0b1 ) << 1 | (S & 0b10) | (Y & 0b1)
807 brw_AND(&func
, t1
, X
, brw_imm_uw(0xfffe)); /* X & ~0b1 */
809 brw_AND(&func
, t2
, S
, brw_imm_uw(1)); /* S & 0b1 */
810 brw_OR(&func
, t1
, t1
, t2
); /* (X & ~0b1) | (S & 0b1) */
812 brw_SHL(&func
, t1
, t1
, brw_imm_uw(1)); /* (X & ~0b1) << 1
814 brw_AND(&func
, t2
, X
, brw_imm_uw(1)); /* X & 0b1 */
815 brw_OR(&func
, Xp
, t1
, t2
);
816 brw_AND(&func
, t1
, Y
, brw_imm_uw(0xfffe)); /* Y & ~0b1 */
817 brw_SHL(&func
, t1
, t1
, brw_imm_uw(1)); /* (Y & ~0b1) << 1 */
819 brw_AND(&func
, t2
, S
, brw_imm_uw(2)); /* S & 0b10 */
820 brw_OR(&func
, t1
, t1
, t2
); /* (Y & ~0b1) << 1 | (S & 0b10) */
822 brw_AND(&func
, t2
, Y
, brw_imm_uw(1));
823 brw_OR(&func
, Yp
, t1
, t2
);
829 * Emit code to compensate for the difference between MSAA and non-MSAA
832 * This code modifies the X and Y coordinates according to the formula:
834 * (X', Y', S) = decode_msaa(num_samples, X, Y)
836 * (See brw_blorp_blit_program).
839 brw_blorp_blit_program::decode_msaa(unsigned num_samples
)
841 if (num_samples
== 0) {
842 /* No translation necessary. */
845 /* decode_msaa_4x(X, Y) = (X', Y', S)
846 * where X' = (X & ~0b11) >> 1 | (X & 0b1)
847 * Y' = (Y & ~0b11) >> 1 | (Y & 0b1)
848 * S = (Y & 0b10) | (X & 0b10) >> 1
850 brw_AND(&func
, t1
, X
, brw_imm_uw(0xfffc)); /* X & ~0b11 */
851 brw_SHR(&func
, t1
, t1
, brw_imm_uw(1)); /* (X & ~0b11) >> 1 */
852 brw_AND(&func
, t2
, X
, brw_imm_uw(1)); /* X & 0b1 */
853 brw_OR(&func
, Xp
, t1
, t2
);
854 brw_AND(&func
, t1
, Y
, brw_imm_uw(0xfffc)); /* Y & ~0b11 */
855 brw_SHR(&func
, t1
, t1
, brw_imm_uw(1)); /* (Y & ~0b11) >> 1 */
856 brw_AND(&func
, t2
, Y
, brw_imm_uw(1)); /* Y & 0b1 */
857 brw_OR(&func
, Yp
, t1
, t2
);
858 brw_AND(&func
, t1
, Y
, brw_imm_uw(2)); /* Y & 0b10 */
859 brw_AND(&func
, t2
, X
, brw_imm_uw(2)); /* X & 0b10 */
860 brw_SHR(&func
, t2
, t2
, brw_imm_uw(1)); /* (X & 0b10) >> 1 */
861 brw_OR(&func
, S
, t1
, t2
);
868 * Emit code that kills pixels whose X and Y coordinates are outside the
869 * boundary of the rectangle defined by the push constants (dst_x0, dst_y0,
873 brw_blorp_blit_program::kill_if_outside_dst_rect()
875 struct brw_reg f0
= brw_flag_reg();
876 struct brw_reg g1
= retype(brw_vec1_grf(1, 7), BRW_REGISTER_TYPE_UW
);
877 struct brw_reg null16
= vec16(retype(brw_null_reg(), BRW_REGISTER_TYPE_UW
));
879 brw_CMP(&func
, null16
, BRW_CONDITIONAL_GE
, X
, dst_x0
);
880 brw_CMP(&func
, null16
, BRW_CONDITIONAL_GE
, Y
, dst_y0
);
881 brw_CMP(&func
, null16
, BRW_CONDITIONAL_L
, X
, dst_x1
);
882 brw_CMP(&func
, null16
, BRW_CONDITIONAL_L
, Y
, dst_y1
);
884 brw_set_predicate_control(&func
, BRW_PREDICATE_NONE
);
885 brw_push_insn_state(&func
);
886 brw_set_mask_control(&func
, BRW_MASK_DISABLE
);
887 brw_AND(&func
, g1
, f0
, g1
);
888 brw_pop_insn_state(&func
);
892 * Emit code to translate from destination (X, Y) coordinates to source (X, Y)
896 brw_blorp_blit_program::translate_dst_to_src()
898 brw_MUL(&func
, Xp
, X
, x_transform
.multiplier
);
899 brw_MUL(&func
, Yp
, Y
, y_transform
.multiplier
);
900 brw_ADD(&func
, Xp
, Xp
, x_transform
.offset
);
901 brw_ADD(&func
, Yp
, Yp
, y_transform
.offset
);
906 * Emit code to transform the X and Y coordinates as needed for blending
907 * together the different samples in an MSAA texture.
910 brw_blorp_blit_program::single_to_blend()
912 /* When looking up samples in an MSAA texture using the SAMPLE message,
913 * Gen6 requires the texture coordinates to be odd integers (so that they
914 * correspond to the center of a 2x2 block representing the four samples
915 * that maxe up a pixel). So we need to multiply our X and Y coordinates
916 * each by 2 and then add 1.
918 brw_SHL(&func
, t1
, X
, brw_imm_w(1));
919 brw_SHL(&func
, t2
, Y
, brw_imm_w(1));
920 brw_ADD(&func
, Xp
, t1
, brw_imm_w(1));
921 brw_ADD(&func
, Yp
, t2
, brw_imm_w(1));
926 * Emit code to look up a value in the texture using the SAMPLE message (which
927 * does blending of MSAA surfaces).
930 brw_blorp_blit_program::sample()
932 static const sampler_message_arg args
[2] = {
933 SAMPLER_MESSAGE_ARG_U_FLOAT
,
934 SAMPLER_MESSAGE_ARG_V_FLOAT
937 texture_lookup(GEN5_SAMPLER_MESSAGE_SAMPLE
, args
, ARRAY_SIZE(args
));
941 * Emit code to look up a value in the texture using the SAMPLE_LD message
942 * (which does a simple texel fetch).
945 brw_blorp_blit_program::texel_fetch()
947 static const sampler_message_arg gen6_args
[5] = {
948 SAMPLER_MESSAGE_ARG_U_INT
,
949 SAMPLER_MESSAGE_ARG_V_INT
,
950 SAMPLER_MESSAGE_ARG_ZERO_INT
, /* R */
951 SAMPLER_MESSAGE_ARG_ZERO_INT
, /* LOD */
952 SAMPLER_MESSAGE_ARG_SI_INT
954 static const sampler_message_arg gen7_ld_args
[3] = {
955 SAMPLER_MESSAGE_ARG_U_INT
,
956 SAMPLER_MESSAGE_ARG_ZERO_INT
, /* LOD */
957 SAMPLER_MESSAGE_ARG_V_INT
959 static const sampler_message_arg gen7_ld2dss_args
[3] = {
960 SAMPLER_MESSAGE_ARG_SI_INT
,
961 SAMPLER_MESSAGE_ARG_U_INT
,
962 SAMPLER_MESSAGE_ARG_V_INT
965 switch (brw
->intel
.gen
) {
967 texture_lookup(GEN5_SAMPLER_MESSAGE_SAMPLE_LD
, gen6_args
,
971 if (key
->tex_samples
> 0) {
972 texture_lookup(GEN7_SAMPLER_MESSAGE_SAMPLE_LD2DSS
,
973 gen7_ld2dss_args
, ARRAY_SIZE(gen7_ld2dss_args
));
976 texture_lookup(GEN5_SAMPLER_MESSAGE_SAMPLE_LD
, gen7_ld_args
,
977 ARRAY_SIZE(gen7_ld_args
));
981 assert(!"Should not get here.");
987 brw_blorp_blit_program::expand_to_32_bits(struct brw_reg src
,
990 brw_MOV(&func
, vec8(dst
), vec8(src
));
991 brw_set_compression_control(&func
, BRW_COMPRESSION_2NDHALF
);
992 brw_MOV(&func
, offset(vec8(dst
), 1), suboffset(vec8(src
), 8));
993 brw_set_compression_control(&func
, BRW_COMPRESSION_NONE
);
997 brw_blorp_blit_program::texture_lookup(GLuint msg_type
,
998 const sampler_message_arg
*args
,
1001 struct brw_reg mrf
=
1002 retype(vec16(brw_message_reg(base_mrf
)), BRW_REGISTER_TYPE_UD
);
1003 for (int arg
= 0; arg
< num_args
; ++arg
) {
1004 switch (args
[arg
]) {
1005 case SAMPLER_MESSAGE_ARG_U_FLOAT
:
1006 expand_to_32_bits(X
, retype(mrf
, BRW_REGISTER_TYPE_F
));
1008 case SAMPLER_MESSAGE_ARG_V_FLOAT
:
1009 expand_to_32_bits(Y
, retype(mrf
, BRW_REGISTER_TYPE_F
));
1011 case SAMPLER_MESSAGE_ARG_U_INT
:
1012 expand_to_32_bits(X
, mrf
);
1014 case SAMPLER_MESSAGE_ARG_V_INT
:
1015 expand_to_32_bits(Y
, mrf
);
1017 case SAMPLER_MESSAGE_ARG_SI_INT
:
1018 /* Note: on Gen7, this code may be reached with s_is_zero==true
1019 * because in Gen7's ld2dss message, the sample index is the first
1020 * argument. When this happens, we need to move a 0 into the
1021 * appropriate message register.
1024 brw_MOV(&func
, mrf
, brw_imm_ud(0));
1026 expand_to_32_bits(S
, mrf
);
1028 case SAMPLER_MESSAGE_ARG_ZERO_INT
:
1029 brw_MOV(&func
, mrf
, brw_imm_ud(0));
1036 retype(Rdata
, BRW_REGISTER_TYPE_UW
) /* dest */,
1037 base_mrf
/* msg_reg_nr */,
1038 brw_message_reg(base_mrf
) /* src0 */,
1039 BRW_BLORP_TEXTURE_BINDING_TABLE_INDEX
,
1043 8 /* response_length. TODO: should be smaller for non-RGBA formats? */,
1044 mrf
.nr
- base_mrf
/* msg_length */,
1045 0 /* header_present */,
1046 BRW_SAMPLER_SIMD_MODE_SIMD16
,
1047 BRW_SAMPLER_RETURN_FORMAT_FLOAT32
);
1055 #undef SWAP_XY_AND_XPYP
1058 brw_blorp_blit_program::render_target_write()
1060 struct brw_reg mrf_rt_write
= vec16(brw_message_reg(base_mrf
));
1063 /* If we may have killed pixels, then we need to send R0 and R1 in a header
1064 * so that the render target knows which pixels we killed.
1066 bool use_header
= key
->use_kill
;
1068 /* Copy R0/1 to MRF */
1069 brw_MOV(&func
, retype(mrf_rt_write
, BRW_REGISTER_TYPE_UD
),
1070 retype(R0
, BRW_REGISTER_TYPE_UD
));
1074 /* Copy texture data to MRFs */
1075 for (int i
= 0; i
< 4; ++i
) {
1076 /* E.g. mov(16) m2.0<1>:f r2.0<8;8,1>:f { Align1, H1 } */
1077 brw_MOV(&func
, offset(mrf_rt_write
, mrf_offset
), offset(vec8(Rdata
), 2*i
));
1081 /* Now write to the render target and terminate the thread */
1083 16 /* dispatch_width */,
1084 base_mrf
/* msg_reg_nr */,
1085 mrf_rt_write
/* src0 */,
1086 BRW_DATAPORT_RENDER_TARGET_WRITE_SIMD16_SINGLE_SOURCE
,
1087 BRW_BLORP_RENDERBUFFER_BINDING_TABLE_INDEX
,
1088 mrf_offset
/* msg_length. TODO: Should be smaller for non-RGBA formats. */,
1089 0 /* response_length */,
1096 brw_blorp_coord_transform_params::setup(GLuint src0
, GLuint dst0
, GLuint dst1
,
1100 /* When not mirroring a coordinate (say, X), we need:
1101 * x' - src_x0 = x - dst_x0
1103 * x' = 1*x + (src_x0 - dst_x0)
1106 offset
= src0
- dst0
;
1108 /* When mirroring X we need:
1109 * x' - src_x0 = dst_x1 - x - 1
1111 * x' = -1*x + (src_x0 + dst_x1 - 1)
1114 offset
= src0
+ dst1
- 1;
1119 brw_blorp_blit_params::brw_blorp_blit_params(struct intel_mipmap_tree
*src_mt
,
1120 struct intel_mipmap_tree
*dst_mt
,
1121 GLuint src_x0
, GLuint src_y0
,
1122 GLuint dst_x0
, GLuint dst_y0
,
1123 GLuint dst_x1
, GLuint dst_y1
,
1124 bool mirror_x
, bool mirror_y
)
1126 src
.set(src_mt
, 0, 0);
1127 dst
.set(dst_mt
, 0, 0);
1130 memset(&wm_prog_key
, 0, sizeof(wm_prog_key
));
1132 if (dst
.map_stencil_as_y_tiled
&& dst
.num_samples
> 0) {
1133 /* If the destination surface is a W-tiled multisampled stencil buffer
1134 * that we're mapping as Y tiled, then we need to arrange for the WM
1135 * program to run once per sample rather than once per pixel, because
1136 * the memory layout of related samples doesn't match between W and Y
1139 wm_prog_key
.persample_msaa_dispatch
= true;
1142 if (src
.num_samples
> 0 && dst
.num_samples
> 0) {
1143 /* We are blitting from a multisample buffer to a multisample buffer, so
1144 * we must preserve samples within a pixel. This means we have to
1145 * arrange for the WM program to run once per sample rather than once
1148 wm_prog_key
.persample_msaa_dispatch
= true;
1151 /* The render path must be configured to use the same number of samples as
1152 * the destination buffer.
1154 num_samples
= dst
.num_samples
;
1156 GLenum base_format
= _mesa_get_format_base_format(src_mt
->format
);
1157 if (base_format
!= GL_DEPTH_COMPONENT
&& /* TODO: what about depth/stencil? */
1158 base_format
!= GL_STENCIL_INDEX
&&
1159 src_mt
->num_samples
> 0 && dst_mt
->num_samples
== 0) {
1160 /* We are downsampling a color buffer, so blend. */
1161 wm_prog_key
.blend
= true;
1164 /* src_samples and dst_samples are the true sample counts */
1165 wm_prog_key
.src_samples
= src_mt
->num_samples
;
1166 wm_prog_key
.dst_samples
= dst_mt
->num_samples
;
1168 /* tex_samples and rt_samples are the sample counts that are set up in
1171 wm_prog_key
.tex_samples
= src
.num_samples
;
1172 wm_prog_key
.rt_samples
= dst
.num_samples
;
1174 wm_prog_key
.src_tiled_w
= src
.map_stencil_as_y_tiled
;
1175 wm_prog_key
.dst_tiled_w
= dst
.map_stencil_as_y_tiled
;
1176 x0
= wm_push_consts
.dst_x0
= dst_x0
;
1177 y0
= wm_push_consts
.dst_y0
= dst_y0
;
1178 x1
= wm_push_consts
.dst_x1
= dst_x1
;
1179 y1
= wm_push_consts
.dst_y1
= dst_y1
;
1180 wm_push_consts
.x_transform
.setup(src_x0
, dst_x0
, dst_x1
, mirror_x
);
1181 wm_push_consts
.y_transform
.setup(src_y0
, dst_y0
, dst_y1
, mirror_y
);
1183 if (dst
.num_samples
== 0 && dst_mt
->num_samples
> 0) {
1184 /* We must expand the rectangle we send through the rendering pipeline,
1185 * to account for the fact that we are mapping the destination region as
1186 * single-sampled when it is in fact multisampled. We must also align
1187 * it to a multiple of the multisampling pattern, because the
1188 * differences between multisampled and single-sampled surface formats
1189 * will mean that pixels are scrambled within the multisampling pattern.
1190 * TODO: what if this makes the coordinates too large?
1194 x1
= ALIGN(x1
* 2, 4);
1195 y1
= ALIGN(y1
* 2, 4);
1196 wm_prog_key
.use_kill
= true;
1199 if (dst
.map_stencil_as_y_tiled
) {
1200 /* We must modify the rectangle we send through the rendering pipeline,
1201 * to account for the fact that we are mapping it as Y-tiled when it is
1202 * in fact W-tiled. Y tiles have dimensions 128x32 whereas W tiles have
1203 * dimensions 64x64. We must also align it to a multiple of the tile
1204 * size, because the differences between W and Y tiling formats will
1205 * mean that pixels are scrambled within the tile.
1207 * Note: if the destination surface configured as an MSAA surface, then
1208 * the effective tile size we need to align it to is smaller, because
1209 * each pixel covers a 2x2 or a 4x2 block of samples.
1211 * TODO: what if this makes the coordinates too large?
1213 unsigned x_align
= 64, y_align
= 64;
1214 if (dst_mt
->num_samples
> 0) {
1215 x_align
/= (dst_mt
->num_samples
== 4 ? 2 : 4);
1218 x0
= (x0
& ~(x_align
- 1)) * 2;
1219 y0
= (y0
& ~(y_align
- 1)) / 2;
1220 x1
= ALIGN(x1
, x_align
) * 2;
1221 y1
= ALIGN(y1
, y_align
) / 2;
1222 wm_prog_key
.use_kill
= true;
1227 brw_blorp_blit_params::get_wm_prog(struct brw_context
*brw
,
1228 brw_blorp_prog_data
**prog_data
) const
1230 uint32_t prog_offset
;
1231 if (!brw_search_cache(&brw
->cache
, BRW_BLORP_BLIT_PROG
,
1232 &this->wm_prog_key
, sizeof(this->wm_prog_key
),
1233 &prog_offset
, prog_data
)) {
1234 brw_blorp_blit_program
prog(brw
, &this->wm_prog_key
);
1235 GLuint program_size
;
1236 const GLuint
*program
= prog
.compile(brw
, &program_size
);
1237 brw_upload_cache(&brw
->cache
, BRW_BLORP_BLIT_PROG
,
1238 &this->wm_prog_key
, sizeof(this->wm_prog_key
),
1239 program
, program_size
,
1240 &prog
.prog_data
, sizeof(prog
.prog_data
),
1241 &prog_offset
, prog_data
);