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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->width0;
118    GLuint face;
119    GLuint lvlWidth = mt->width0, lvlHeight = mt->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->width0;
160    GLuint height = mt->height0;
161    GLuint depth = mt->depth0;
162    GLuint stack_height = 0;
163    GLint level;
164 
165    /* Calculate the size of a single slice. */
166    mt->total_width = mt->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);
176       height = minify(height);
177       depth = minify(depth);
178    }
179 
180    /* Fixup depth image_offsets: */
181    depth = mt->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);
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->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->width0;
203    GLuint height = mt->height0;
204    GLuint img_height;
205    GLint level;
206 
207    mt->total_width = mt->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);
223       height = minify(height);
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", __FUNCTION__,
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->width0;
316    GLuint face;
317    GLuint lvlWidth = mt->width0, lvlHeight = mt->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->width0;
406    GLuint height = mt->height0;
407    GLuint depth = mt->depth0;
408    GLuint pack_x_pitch, pack_x_nr;
409    GLuint pack_y_pitch;
410    GLuint level;
411 
412    mt->total_width = mt->width0;
413    mt->total_height = 0;
414 
415    pack_y_pitch = MAX2(mt->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);
451       height = minify(height);
452       depth = minify(depth);
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", __FUNCTION__,
480        mt->total_width, mt->total_height, mt->cpp);
481 }
482