1 /**************************************************************************
2 *
3 * Copyright 2006 VMware, Inc.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
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11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28 /** @file i915_tex_layout.c
29 * Code to layout images in a mipmap tree for i830M-GM915 and G945 and beyond.
30 */
31
32 #include "intel_mipmap_tree.h"
33 #include "intel_tex_layout.h"
34 #include "main/macros.h"
35 #include "intel_context.h"
36
37 #define FILE_DEBUG_FLAG DEBUG_TEXTURE
38
39 static GLint initial_offsets[6][2] = {
40 [FACE_POS_X] = {0, 0},
41 [FACE_POS_Y] = {1, 0},
42 [FACE_POS_Z] = {1, 1},
43 [FACE_NEG_X] = {0, 2},
44 [FACE_NEG_Y] = {1, 2},
45 [FACE_NEG_Z] = {1, 3},
46 };
47
48
49 static GLint step_offsets[6][2] = {
50 [FACE_POS_X] = {0, 2},
51 [FACE_POS_Y] = {-1, 2},
52 [FACE_POS_Z] = {-1, 1},
53 [FACE_NEG_X] = {0, 2},
54 [FACE_NEG_Y] = {-1, 2},
55 [FACE_NEG_Z] = {-1, 1},
56 };
57
58
59 static GLint bottom_offsets[6] = {
60 [FACE_POS_X] = 16 + 0 * 8,
61 [FACE_POS_Y] = 16 + 1 * 8,
62 [FACE_POS_Z] = 16 + 2 * 8,
63 [FACE_NEG_X] = 16 + 3 * 8,
64 [FACE_NEG_Y] = 16 + 4 * 8,
65 [FACE_NEG_Z] = 16 + 5 * 8,
66 };
67
68
69 /**
70 * Cube texture map layout for i830M-GM915 and
71 * non-compressed cube texture map on GM945.
72 *
73 * Hardware layout looks like:
74 *
75 * +-------+-------+
76 * | | |
77 * | | |
78 * | | |
79 * | +x | +y |
80 * | | |
81 * | | |
82 * | | |
83 * | | |
84 * +---+---+-------+
85 * | | | |
86 * | +x| +y| |
87 * | | | |
88 * | | | |
89 * +-+-+---+ +z |
90 * | | | | |
91 * +-+-+ +z| |
92 * | | | |
93 * +-+-+---+-------+
94 * | | |
95 * | | |
96 * | | |
97 * | -x | -y |
98 * | | |
99 * | | |
100 * | | |
101 * | | |
102 * +---+---+-------+
103 * | | | |
104 * | -x| -y| |
105 * | | | |
106 * | | | |
107 * +-+-+---+ -z |
108 * | | | | |
109 * +-+-+ -z| |
110 * | | | |
111 * +-+---+-------+
112 *
113 */
114 static void
i915_miptree_layout_cube(struct intel_mipmap_tree * mt)115 i915_miptree_layout_cube(struct intel_mipmap_tree * mt)
116 {
117 const GLuint dim = mt->physical_width0;
118 GLuint face;
119 GLuint lvlWidth = mt->physical_width0, lvlHeight = mt->physical_height0;
120 GLint level;
121
122 assert(lvlWidth == lvlHeight); /* cubemap images are square */
123
124 /* double pitch for cube layouts */
125 mt->total_width = dim * 2;
126 mt->total_height = dim * 4;
127
128 for (level = mt->first_level; level <= mt->last_level; level++) {
129 intel_miptree_set_level_info(mt, level,
130 0, 0,
131 lvlWidth, lvlHeight,
132 6);
133 lvlWidth /= 2;
134 lvlHeight /= 2;
135 }
136
137 for (face = 0; face < 6; face++) {
138 GLuint x = initial_offsets[face][0] * dim;
139 GLuint y = initial_offsets[face][1] * dim;
140 GLuint d = dim;
141
142 for (level = mt->first_level; level <= mt->last_level; level++) {
143 intel_miptree_set_image_offset(mt, level, face, x, y);
144
145 if (d == 0)
146 printf("cube mipmap %d/%d (%d..%d) is 0x0\n",
147 face, level, mt->first_level, mt->last_level);
148
149 d >>= 1;
150 x += step_offsets[face][0] * d;
151 y += step_offsets[face][1] * d;
152 }
153 }
154 }
155
156 static void
i915_miptree_layout_3d(struct intel_mipmap_tree * mt)157 i915_miptree_layout_3d(struct intel_mipmap_tree * mt)
158 {
159 GLuint width = mt->physical_width0;
160 GLuint height = mt->physical_height0;
161 GLuint depth = mt->physical_depth0;
162 GLuint stack_height = 0;
163 GLint level;
164
165 /* Calculate the size of a single slice. */
166 mt->total_width = mt->physical_width0;
167
168 /* XXX: hardware expects/requires 9 levels at minimum. */
169 for (level = mt->first_level; level <= MAX2(8, mt->last_level); level++) {
170 intel_miptree_set_level_info(mt, level, 0, mt->total_height,
171 width, height, depth);
172
173 stack_height += MAX2(2, height);
174
175 width = minify(width, 1);
176 height = minify(height, 1);
177 depth = minify(depth, 1);
178 }
179
180 /* Fixup depth image_offsets: */
181 depth = mt->physical_depth0;
182 for (level = mt->first_level; level <= mt->last_level; level++) {
183 GLuint i;
184 for (i = 0; i < depth; i++) {
185 intel_miptree_set_image_offset(mt, level, i,
186 0, i * stack_height);
187 }
188
189 depth = minify(depth, 1);
190 }
191
192 /* Multiply slice size by texture depth for total size. It's
193 * remarkable how wasteful of memory the i915 texture layouts
194 * are. They are largely fixed in the i945.
195 */
196 mt->total_height = stack_height * mt->physical_depth0;
197 }
198
199 static void
i915_miptree_layout_2d(struct intel_mipmap_tree * mt)200 i915_miptree_layout_2d(struct intel_mipmap_tree * mt)
201 {
202 GLuint width = mt->physical_width0;
203 GLuint height = mt->physical_height0;
204 GLuint img_height;
205 GLint level;
206
207 mt->total_width = mt->physical_width0;
208 mt->total_height = 0;
209
210 for (level = mt->first_level; level <= mt->last_level; level++) {
211 intel_miptree_set_level_info(mt, level,
212 0, mt->total_height,
213 width, height, 1);
214
215 if (mt->compressed)
216 img_height = ALIGN(height, 4) / 4;
217 else
218 img_height = ALIGN(height, 2);
219
220 mt->total_height += img_height;
221
222 width = minify(width, 1);
223 height = minify(height, 1);
224 }
225 }
226
227 void
i915_miptree_layout(struct intel_mipmap_tree * mt)228 i915_miptree_layout(struct intel_mipmap_tree * mt)
229 {
230 switch (mt->target) {
231 case GL_TEXTURE_CUBE_MAP:
232 i915_miptree_layout_cube(mt);
233 break;
234 case GL_TEXTURE_3D:
235 i915_miptree_layout_3d(mt);
236 break;
237 case GL_TEXTURE_1D:
238 case GL_TEXTURE_2D:
239 case GL_TEXTURE_RECTANGLE_ARB:
240 i915_miptree_layout_2d(mt);
241 break;
242 default:
243 _mesa_problem(NULL, "Unexpected tex target in i915_miptree_layout()");
244 break;
245 }
246
247 DBG("%s: %dx%dx%d\n", __func__,
248 mt->total_width, mt->total_height, mt->cpp);
249 }
250
251
252 /**
253 * Compressed cube texture map layout for GM945 and later.
254 *
255 * The hardware layout looks like the 830-915 layout, except for the small
256 * sizes. A zoomed in view of the layout for 945 is:
257 *
258 * +-------+-------+
259 * | 8x8 | 8x8 |
260 * | | |
261 * | | |
262 * | +x | +y |
263 * | | |
264 * | | |
265 * | | |
266 * | | |
267 * +---+---+-------+
268 * |4x4| | 8x8 |
269 * | +x| | |
270 * | | | |
271 * | | | |
272 * +---+ | +z |
273 * |4x4| | |
274 * | +y| | |
275 * | | | |
276 * +---+ +-------+
277 *
278 * ...
279 *
280 * +-------+-------+
281 * | 8x8 | 8x8 |
282 * | | |
283 * | | |
284 * | -x | -y |
285 * | | |
286 * | | |
287 * | | |
288 * | | |
289 * +---+---+-------+
290 * |4x4| | 8x8 |
291 * | -x| | |
292 * | | | |
293 * | | | |
294 * +---+ | -z |
295 * |4x4| | |
296 * | -y| | |
297 * | | | |
298 * +---+ +---+---+---+---+---+---+---+---+---+
299 * |4x4| |4x4| |2x2| |2x2| |2x2| |2x2|
300 * | +z| | -z| | +x| | +y| | +z| | -x| ...
301 * | | | | | | | | | | | |
302 * +---+ +---+ +---+ +---+ +---+ +---+
303 *
304 * The bottom row continues with the remaining 2x2 then the 1x1 mip contents
305 * in order, with each of them aligned to a 8x8 block boundary. Thus, for
306 * 32x32 cube maps and smaller, the bottom row layout is going to dictate the
307 * pitch of the tree. For a tree with 4x4 images, the pitch is at least
308 * 14 * 8 = 112 texels, for 2x2 it is at least 12 * 8 texels, and for 1x1
309 * it is 6 * 8 texels.
310 */
311
312 static void
i945_miptree_layout_cube(struct intel_mipmap_tree * mt)313 i945_miptree_layout_cube(struct intel_mipmap_tree * mt)
314 {
315 const GLuint dim = mt->physical_width0;
316 GLuint face;
317 GLuint lvlWidth = mt->physical_width0, lvlHeight = mt->physical_height0;
318 GLint level;
319
320 assert(lvlWidth == lvlHeight); /* cubemap images are square */
321
322 /* Depending on the size of the largest images, pitch can be
323 * determined either by the old-style packing of cubemap faces,
324 * or the final row of 4x4, 2x2 and 1x1 faces below this.
325 */
326 if (dim > 32)
327 mt->total_width = dim * 2;
328 else
329 mt->total_width = 14 * 8;
330
331 if (dim >= 4)
332 mt->total_height = dim * 4 + 4;
333 else
334 mt->total_height = 4;
335
336 /* Set all the levels to effectively occupy the whole rectangular region. */
337 for (level = mt->first_level; level <= mt->last_level; level++) {
338 intel_miptree_set_level_info(mt, level,
339 0, 0,
340 lvlWidth, lvlHeight, 6);
341 lvlWidth /= 2;
342 lvlHeight /= 2;
343 }
344
345 for (face = 0; face < 6; face++) {
346 GLuint x = initial_offsets[face][0] * dim;
347 GLuint y = initial_offsets[face][1] * dim;
348 GLuint d = dim;
349
350 if (dim == 4 && face >= 4) {
351 y = mt->total_height - 4;
352 x = (face - 4) * 8;
353 } else if (dim < 4 && (face > 0 || mt->first_level > 0)) {
354 y = mt->total_height - 4;
355 x = face * 8;
356 }
357
358 for (level = mt->first_level; level <= mt->last_level; level++) {
359 intel_miptree_set_image_offset(mt, level, face, x, y);
360
361 d >>= 1;
362
363 switch (d) {
364 case 4:
365 switch (face) {
366 case FACE_POS_X:
367 case FACE_NEG_X:
368 x += step_offsets[face][0] * d;
369 y += step_offsets[face][1] * d;
370 break;
371 case FACE_POS_Y:
372 case FACE_NEG_Y:
373 y += 12;
374 x -= 8;
375 break;
376 case FACE_POS_Z:
377 case FACE_NEG_Z:
378 y = mt->total_height - 4;
379 x = (face - 4) * 8;
380 break;
381 }
382 break;
383
384 case 2:
385 y = mt->total_height - 4;
386 x = bottom_offsets[face];
387 break;
388
389 case 1:
390 x += 48;
391 break;
392
393 default:
394 x += step_offsets[face][0] * d;
395 y += step_offsets[face][1] * d;
396 break;
397 }
398 }
399 }
400 }
401
402 static void
i945_miptree_layout_3d(struct intel_mipmap_tree * mt)403 i945_miptree_layout_3d(struct intel_mipmap_tree * mt)
404 {
405 GLuint width = mt->physical_width0;
406 GLuint height = mt->physical_height0;
407 GLuint depth = mt->physical_depth0;
408 GLuint pack_x_pitch, pack_x_nr;
409 GLuint pack_y_pitch;
410 GLuint level;
411
412 mt->total_width = mt->physical_width0;
413 mt->total_height = 0;
414
415 pack_y_pitch = MAX2(mt->physical_height0, 2);
416 pack_x_pitch = mt->total_width;
417 pack_x_nr = 1;
418
419 for (level = mt->first_level; level <= mt->last_level; level++) {
420 GLint x = 0;
421 GLint y = 0;
422 GLint q, j;
423
424 intel_miptree_set_level_info(mt, level,
425 0, mt->total_height,
426 width, height, depth);
427
428 for (q = 0; q < depth;) {
429 for (j = 0; j < pack_x_nr && q < depth; j++, q++) {
430 intel_miptree_set_image_offset(mt, level, q, x, y);
431 x += pack_x_pitch;
432 }
433
434 x = 0;
435 y += pack_y_pitch;
436 }
437
438 mt->total_height += y;
439
440 if (pack_x_pitch > 4) {
441 pack_x_pitch >>= 1;
442 pack_x_nr <<= 1;
443 assert(pack_x_pitch * pack_x_nr <= mt->total_width);
444 }
445
446 if (pack_y_pitch > 2) {
447 pack_y_pitch >>= 1;
448 }
449
450 width = minify(width, 1);
451 height = minify(height, 1);
452 depth = minify(depth, 1);
453 }
454 }
455
456 void
i945_miptree_layout(struct intel_mipmap_tree * mt)457 i945_miptree_layout(struct intel_mipmap_tree * mt)
458 {
459 switch (mt->target) {
460 case GL_TEXTURE_CUBE_MAP:
461 if (mt->compressed)
462 i945_miptree_layout_cube(mt);
463 else
464 i915_miptree_layout_cube(mt);
465 break;
466 case GL_TEXTURE_3D:
467 i945_miptree_layout_3d(mt);
468 break;
469 case GL_TEXTURE_1D:
470 case GL_TEXTURE_2D:
471 case GL_TEXTURE_RECTANGLE_ARB:
472 i945_miptree_layout_2d(mt);
473 break;
474 default:
475 _mesa_problem(NULL, "Unexpected tex target in i945_miptree_layout()");
476 break;
477 }
478
479 DBG("%s: %dx%dx%d\n", __func__,
480 mt->total_width, mt->total_height, mt->cpp);
481 }
482