src/mesa/drivers/dri/i915/i915_tex_layout.c

   1 /**************************************************************************
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   3  * Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.
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  11  * permit persons to whom the Software is furnished to do so, subject to
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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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
 115 i915_miptree_layout_cube(struct intel_context *intel,
 116                          struct intel_mipmap_tree * mt,
 117                          uint32_t tiling)
 118 {
 119    const GLuint dim = mt->width0;
 120    GLuint face;
 121    GLuint lvlWidth = mt->width0, lvlHeight = mt->height0;
 122    GLint level;
 123
 124    assert(lvlWidth == lvlHeight); /* cubemap images are square */
 125
 126    /* double pitch for cube layouts */
 127    mt->total_width = dim * 2;
 128    mt->total_height = dim * 4;
 129
 130    for (level = mt->first_level; level <= mt->last_level; level++) {
 131       intel_miptree_set_level_info(mt, level, 6,
 132                                    0, 0,
 133                                    lvlWidth, lvlHeight,
 134                                    1);
 135       lvlWidth /= 2;
 136       lvlHeight /= 2;
 137    }
 138
 139    for (face = 0; face < 6; face++) {
 140       GLuint x = initial_offsets[face][0] * dim;
 141       GLuint y = initial_offsets[face][1] * dim;
 142       GLuint d = dim;
 143
 144       for (level = mt->first_level; level <= mt->last_level; level++) {
 145          intel_miptree_set_image_offset(mt, level, face, x, y);
 146
 147          if (d == 0)
 148             printf("cube mipmap %d/%d (%d..%d) is 0x0\n",
 149                    face, level, mt->first_level, mt->last_level);
 150
 151          d >>= 1;
 152          x += step_offsets[face][0] * d;
 153          y += step_offsets[face][1] * d;
 154       }
 155    }
 156 }
 157
 158 static void
 159 i915_miptree_layout_3d(struct intel_context *intel,
 160                        struct intel_mipmap_tree * mt,
 161                        uint32_t tiling)
 162 {
 163    GLuint width = mt->width0;
 164    GLuint height = mt->height0;
 165    GLuint depth = mt->depth0;
 166    GLuint stack_height = 0;
 167    GLint level;
 168
 169    /* Calculate the size of a single slice. */
 170    mt->total_width = mt->width0;
 171
 172    /* XXX: hardware expects/requires 9 levels at minimum. */
 173    for (level = mt->first_level; level <= MAX2(8, mt->last_level); level++) {
 174       intel_miptree_set_level_info(mt, level, depth, 0, mt->total_height,
 175                                    width, height, depth);
 176
 177       stack_height += MAX2(2, height);
 178
 179       width = minify(width);
 180       height = minify(height);
 181       depth = minify(depth);
 182    }
 183
 184    /* Fixup depth image_offsets: */
 185    depth = mt->depth0;
 186    for (level = mt->first_level; level <= mt->last_level; level++) {
 187       GLuint i;
 188       for (i = 0; i < depth; i++) {
 189          intel_miptree_set_image_offset(mt, level, i,
 190                                         0, i * stack_height);
 191       }
 192
 193       depth = minify(depth);
 194    }
 195
 196    /* Multiply slice size by texture depth for total size.  It's
 197     * remarkable how wasteful of memory the i915 texture layouts
 198     * are.  They are largely fixed in the i945.
 199     */
 200    mt->total_height = stack_height * mt->depth0;
 201 }
 202
 203 static void
 204 i915_miptree_layout_2d(struct intel_context *intel,
 205                        struct intel_mipmap_tree * mt,
 206                        uint32_t tiling)
 207 {
 208    GLuint width = mt->width0;
 209    GLuint height = mt->height0;
 210    GLuint img_height;
 211    GLint level;
 212
 213    mt->total_width = mt->width0;
 214    mt->total_height = 0;
 215
 216    for (level = mt->first_level; level <= mt->last_level; level++) {
 217       intel_miptree_set_level_info(mt, level, 1,
 218                                    0, mt->total_height,
 219                                    width, height, 1);
 220
 221       if (mt->compressed)
 222          img_height = ALIGN(height, 4) / 4;
 223       else
 224          img_height = ALIGN(height, 2);
 225
 226       mt->total_height += img_height;
 227
 228       width = minify(width);
 229       height = minify(height);
 230    }
 231 }
 232
 233 GLboolean
 234 i915_miptree_layout(struct intel_context *intel, struct intel_mipmap_tree * mt,
 235                     uint32_t tiling)
 236 {
 237    switch (mt->target) {
 238    case GL_TEXTURE_CUBE_MAP:
 239       i915_miptree_layout_cube(intel, mt, tiling);
 240       break;
 241    case GL_TEXTURE_3D:
 242       i915_miptree_layout_3d(intel, mt, tiling);
 243       break;
 244    case GL_TEXTURE_1D:
 245    case GL_TEXTURE_2D:
 246    case GL_TEXTURE_RECTANGLE_ARB:
 247       i915_miptree_layout_2d(intel, mt, tiling);
 248       break;
 249    default:
 250       _mesa_problem(NULL, "Unexpected tex target in i915_miptree_layout()");
 251       break;
 252    }
 253
 254    DBG("%s: %dx%dx%d\n", __FUNCTION__,
 255        mt->total_width, mt->total_height, mt->cpp);
 256
 257    return GL_TRUE;
 258 }
 259
 260
 261 /**
 262  * Compressed cube texture map layout for GM945 and later.
 263  *
 264  * The hardware layout looks like the 830-915 layout, except for the small
 265  * sizes.  A zoomed in view of the layout for 945 is:
 266  *
 267  * +-------+-------+
 268  * |  8x8  |  8x8  |
 269  * |       |       |
 270  * |       |       |
 271  * |  +x   |  +y   |
 272  * |       |       |
 273  * |       |       |
 274  * |       |       |
 275  * |       |       |
 276  * +---+---+-------+
 277  * |4x4|   |  8x8  |
 278  * | +x|   |       |
 279  * |   |   |       |
 280  * |   |   |       |
 281  * +---+   |  +z   |
 282  * |4x4|   |       |
 283  * | +y|   |       |
 284  * |   |   |       |
 285  * +---+   +-------+
 286  *
 287  * ...
 288  *
 289  * +-------+-------+
 290  * |  8x8  |  8x8  |
 291  * |       |       |
 292  * |       |       |
 293  * |  -x   |  -y   |
 294  * |       |       |
 295  * |       |       |
 296  * |       |       |
 297  * |       |       |
 298  * +---+---+-------+
 299  * |4x4|   |  8x8  |
 300  * | -x|   |       |
 301  * |   |   |       |
 302  * |   |   |       |
 303  * +---+   |  -z   |
 304  * |4x4|   |       |
 305  * | -y|   |       |
 306  * |   |   |       |
 307  * +---+   +---+---+---+---+---+---+---+---+---+
 308  * |4x4|   |4x4|   |2x2|   |2x2|   |2x2|   |2x2|
 309  * | +z|   | -z|   | +x|   | +y|   | +z|   | -x| ...
 310  * |   |   |   |   |   |   |   |   |   |   |   |
 311  * +---+   +---+   +---+   +---+   +---+   +---+
 312  *
 313  * The bottom row continues with the remaining 2x2 then the 1x1 mip contents
 314  * in order, with each of them aligned to a 8x8 block boundary.  Thus, for
 315  * 32x32 cube maps and smaller, the bottom row layout is going to dictate the
 316  * pitch of the tree.  For a tree with 4x4 images, the pitch is at least
 317  * 14 * 8 = 112 texels, for 2x2 it is at least 12 * 8 texels, and for 1x1
 318  * it is 6 * 8 texels.
 319  */
 320
 321 static void
 322 i945_miptree_layout_cube(struct intel_context *intel,
 323                          struct intel_mipmap_tree * mt,
 324                          uint32_t tiling)
 325 {
 326    const GLuint dim = mt->width0;
 327    GLuint face;
 328    GLuint lvlWidth = mt->width0, lvlHeight = mt->height0;
 329    GLint level;
 330
 331    assert(lvlWidth == lvlHeight); /* cubemap images are square */
 332
 333    /* Depending on the size of the largest images, pitch can be
 334     * determined either by the old-style packing of cubemap faces,
 335     * or the final row of 4x4, 2x2 and 1x1 faces below this.
 336     */
 337    if (dim > 32)
 338       mt->total_width = dim * 2;
 339    else
 340       mt->total_width = 14 * 8;
 341
 342    if (dim >= 4)
 343       mt->total_height = dim * 4 + 4;
 344    else
 345       mt->total_height = 4;
 346
 347    /* Set all the levels to effectively occupy the whole rectangular region. */
 348    for (level = mt->first_level; level <= mt->last_level; level++) {
 349       intel_miptree_set_level_info(mt, level, 6,
 350                                    0, 0,
 351                                    lvlWidth, lvlHeight, 1);
 352       lvlWidth /= 2;
 353       lvlHeight /= 2;
 354    }
 355
 356    for (face = 0; face < 6; face++) {
 357       GLuint x = initial_offsets[face][0] * dim;
 358       GLuint y = initial_offsets[face][1] * dim;
 359       GLuint d = dim;
 360
 361       if (dim == 4 && face >= 4) {
 362          y = mt->total_height - 4;
 363          x = (face - 4) * 8;
 364       } else if (dim < 4 && (face > 0 || mt->first_level > 0)) {
 365          y = mt->total_height - 4;
 366          x = face * 8;
 367       }
 368
 369       for (level = mt->first_level; level <= mt->last_level; level++) {
 370          intel_miptree_set_image_offset(mt, level, face, x, y);
 371
 372          d >>= 1;
 373
 374          switch (d) {
 375          case 4:
 376             switch (face) {
 377             case FACE_POS_X:
 378             case FACE_NEG_X:
 379                x += step_offsets[face][0] * d;
 380                y += step_offsets[face][1] * d;
 381                break;
 382             case FACE_POS_Y:
 383             case FACE_NEG_Y:
 384                y += 12;
 385                x -= 8;
 386                break;
 387             case FACE_POS_Z:
 388             case FACE_NEG_Z:
 389                y = mt->total_height - 4;
 390                x = (face - 4) * 8;
 391                break;
 392             }
 393             break;
 394
 395          case 2:
 396             y = mt->total_height - 4;
 397             x = bottom_offsets[face];
 398             break;
 399
 400          case 1:
 401             x += 48;
 402             break;
 403
 404          default:
 405             x += step_offsets[face][0] * d;
 406             y += step_offsets[face][1] * d;
 407             break;
 408          }
 409       }
 410    }
 411 }
 412
 413 static void
 414 i945_miptree_layout_3d(struct intel_context *intel,
 415                        struct intel_mipmap_tree * mt,
 416                        uint32_t tiling)
 417 {
 418    GLuint width = mt->width0;
 419    GLuint height = mt->height0;
 420    GLuint depth = mt->depth0;
 421    GLuint pack_x_pitch, pack_x_nr;
 422    GLuint pack_y_pitch;
 423    GLuint level;
 424
 425    mt->total_width = mt->width0;
 426    mt->total_height = 0;
 427
 428    pack_y_pitch = MAX2(mt->height0, 2);
 429    pack_x_pitch = mt->total_width;
 430    pack_x_nr = 1;
 431
 432    for (level = mt->first_level; level <= mt->last_level; level++) {
 433       GLint x = 0;
 434       GLint y = 0;
 435       GLint q, j;
 436
 437       intel_miptree_set_level_info(mt, level, depth,
 438                                    0, mt->total_height,
 439                                    width, height, depth);
 440
 441       for (q = 0; q < depth;) {
 442          for (j = 0; j < pack_x_nr && q < depth; j++, q++) {
 443             intel_miptree_set_image_offset(mt, level, q, x, y);
 444             x += pack_x_pitch;
 445          }
 446
 447          x = 0;
 448          y += pack_y_pitch;
 449       }
 450
 451       mt->total_height += y;
 452
 453       if (pack_x_pitch > 4) {
 454          pack_x_pitch >>= 1;
 455          pack_x_nr <<= 1;
 456          assert(pack_x_pitch * pack_x_nr <= mt->total_width);
 457       }
 458
 459       if (pack_y_pitch > 2) {
 460          pack_y_pitch >>= 1;
 461       }
 462
 463       width = minify(width);
 464       height = minify(height);
 465       depth = minify(depth);
 466    }
 467 }
 468
 469 GLboolean
 470 i945_miptree_layout(struct intel_context *intel, struct intel_mipmap_tree * mt,
 471                     uint32_t tiling)
 472 {
 473    switch (mt->target) {
 474    case GL_TEXTURE_CUBE_MAP:
 475       if (mt->compressed)
 476          i945_miptree_layout_cube(intel, mt, tiling);
 477       else
 478          i915_miptree_layout_cube(intel, mt, tiling);
 479       break;
 480    case GL_TEXTURE_3D:
 481       i945_miptree_layout_3d(intel, mt, tiling);
 482       break;
 483    case GL_TEXTURE_1D:
 484    case GL_TEXTURE_2D:
 485    case GL_TEXTURE_RECTANGLE_ARB:
 486       i945_miptree_layout_2d(intel, mt, tiling, 1);
 487       break;
 488    default:
 489       _mesa_problem(NULL, "Unexpected tex target in i945_miptree_layout()");
 490       break;
 491    }
 492
 493    DBG("%s: %dx%dx%d\n", __FUNCTION__,
 494        mt->total_width, mt->total_height, mt->cpp);
 495
 496    return GL_TRUE;
 497 }