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  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
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sub license, and/or sell copies of the Software, and to
  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
  20.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21.  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22.  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  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.   * Authors:
  29.   *   Keith Whitwell <keithw@vmware.com>
  30.   *   Michel Dänzer <daenzer@vmware.com>
  31.   */
  32.  
  33. #include "pipe/p_state.h"
  34. #include "pipe/p_context.h"
  35. #include "pipe/p_defines.h"
  36. #include "util/u_inlines.h"
  37. #include "util/u_format.h"
  38. #include "util/u_math.h"
  39. #include "util/u_memory.h"
  40. #include "util/u_rect.h"
  41.  
  42. #include "i915_context.h"
  43. #include "i915_resource.h"
  44. #include "i915_screen.h"
  45. #include "i915_winsys.h"
  46. #include "i915_debug.h"
  47.  
  48.  
  49. #define DEBUG_TEXTURES 0
  50.  
  51. /*
  52.  * Helper function and arrays
  53.  */
  54.  
  55.  
  56. /**
  57.  * Initial offset for Cube map.
  58.  */
  59. static const int initial_offsets[6][2] = {
  60.    [PIPE_TEX_FACE_POS_X] = {0, 0},
  61.    [PIPE_TEX_FACE_POS_Y] = {1, 0},
  62.    [PIPE_TEX_FACE_POS_Z] = {1, 1},
  63.    [PIPE_TEX_FACE_NEG_X] = {0, 2},
  64.    [PIPE_TEX_FACE_NEG_Y] = {1, 2},
  65.    [PIPE_TEX_FACE_NEG_Z] = {1, 3},
  66. };
  67.  
  68. /**
  69.  * Step offsets for Cube map.
  70.  */
  71. static const int step_offsets[6][2] = {
  72.    [PIPE_TEX_FACE_POS_X] = { 0, 2},
  73.    [PIPE_TEX_FACE_POS_Y] = {-1, 2},
  74.    [PIPE_TEX_FACE_POS_Z] = {-1, 1},
  75.    [PIPE_TEX_FACE_NEG_X] = { 0, 2},
  76.    [PIPE_TEX_FACE_NEG_Y] = {-1, 2},
  77.    [PIPE_TEX_FACE_NEG_Z] = {-1, 1},
  78. };
  79.  
  80. /**
  81.  * For compressed level 2
  82.  */
  83. static const int bottom_offsets[6] = {
  84.    [PIPE_TEX_FACE_POS_X] = 16 + 0 * 8,
  85.    [PIPE_TEX_FACE_POS_Y] = 16 + 1 * 8,
  86.    [PIPE_TEX_FACE_POS_Z] = 16 + 2 * 8,
  87.    [PIPE_TEX_FACE_NEG_X] = 16 + 3 * 8,
  88.    [PIPE_TEX_FACE_NEG_Y] = 16 + 4 * 8,
  89.    [PIPE_TEX_FACE_NEG_Z] = 16 + 5 * 8,
  90. };
  91.  
  92. static INLINE unsigned
  93. align_nblocksx(enum pipe_format format, unsigned width, unsigned align_to)
  94. {
  95.    return align(util_format_get_nblocksx(format, width), align_to);
  96. }
  97.  
  98. static INLINE unsigned
  99. align_nblocksy(enum pipe_format format, unsigned width, unsigned align_to)
  100. {
  101.    return align(util_format_get_nblocksy(format, width), align_to);
  102. }
  103.  
  104. static INLINE unsigned
  105. get_pot_stride(enum pipe_format format, unsigned width)
  106. {
  107.    return util_next_power_of_two(util_format_get_stride(format, width));
  108. }
  109.  
  110. static INLINE const char*
  111. get_tiling_string(enum i915_winsys_buffer_tile tile)
  112. {
  113.    switch(tile) {
  114.    case I915_TILE_NONE:
  115.       return "none";
  116.    case I915_TILE_X:
  117.       return "x";
  118.    case I915_TILE_Y:
  119.       return "y";
  120.    default:
  121.       assert(FALSE);
  122.       return "?";
  123.    }
  124. }
  125.  
  126.  
  127. /*
  128.  * More advanced helper funcs
  129.  */
  130.  
  131.  
  132. static void
  133. i915_texture_set_level_info(struct i915_texture *tex,
  134.                             unsigned level, unsigned nr_images)
  135. {
  136.    assert(level < Elements(tex->nr_images));
  137.    assert(nr_images);
  138.    assert(!tex->image_offset[level]);
  139.  
  140.    tex->nr_images[level] = nr_images;
  141.    tex->image_offset[level] = MALLOC(nr_images * sizeof(struct offset_pair));
  142.    tex->image_offset[level][0].nblocksx = 0;
  143.    tex->image_offset[level][0].nblocksy = 0;
  144. }
  145.  
  146. unsigned i915_texture_offset(const struct i915_texture *tex,
  147.                                     unsigned level, unsigned layer)
  148. {
  149.    unsigned x, y;
  150.    x = tex->image_offset[level][layer].nblocksx
  151.       * util_format_get_blocksize(tex->b.b.format);
  152.    y = tex->image_offset[level][layer].nblocksy;
  153.  
  154.    return y * tex->stride + x;
  155. }
  156.  
  157. static void
  158. i915_texture_set_image_offset(struct i915_texture *tex,
  159.                               unsigned level, unsigned img,
  160.                               unsigned nblocksx, unsigned nblocksy)
  161. {
  162.    /* for the first image and level make sure offset is zero */
  163.    assert(!(img == 0 && level == 0) || (nblocksx == 0 && nblocksy == 0));
  164.    assert(img < tex->nr_images[level]);
  165.  
  166.    tex->image_offset[level][img].nblocksx = nblocksx;
  167.    tex->image_offset[level][img].nblocksy = nblocksy;
  168.  
  169. #if DEBUG_TEXTURES
  170.    debug_printf("%s: %p level %u, img %u (%u, %u)\n", __FUNCTION__,
  171.                 tex, level, img, x, y);
  172. #endif
  173. }
  174.  
  175. static enum i915_winsys_buffer_tile
  176. i915_texture_tiling(struct i915_screen *is, struct i915_texture *tex)
  177. {
  178.    if (!is->debug.tiling)
  179.       return I915_TILE_NONE;
  180.  
  181.    if (tex->b.b.target == PIPE_TEXTURE_1D)
  182.       return I915_TILE_NONE;
  183.  
  184.    if (util_format_is_s3tc(tex->b.b.format))
  185.       return I915_TILE_X;
  186.  
  187.    if (is->debug.use_blitter)
  188.       return I915_TILE_X;
  189.    else
  190.       return I915_TILE_Y;
  191. }
  192.  
  193.  
  194. /*
  195.  * Shared layout functions
  196.  */
  197.  
  198.  
  199. /**
  200.  * Special case to deal with scanout textures.
  201.  */
  202. static boolean
  203. i9x5_scanout_layout(struct i915_texture *tex)
  204. {
  205.    struct pipe_resource *pt = &tex->b.b;
  206.  
  207.    if (pt->last_level > 0 || util_format_get_blocksize(pt->format) != 4)
  208.       return FALSE;
  209.  
  210.    i915_texture_set_level_info(tex, 0, 1);
  211.    i915_texture_set_image_offset(tex, 0, 0, 0, 0);
  212.  
  213.    if (pt->width0 >= 240) {
  214.       tex->stride = align(util_format_get_stride(pt->format, pt->width0), 64);
  215.       tex->total_nblocksy = align_nblocksy(pt->format, pt->height0, 8);
  216.       tex->tiling = I915_TILE_X;
  217.    /* special case for cursors */
  218.    } else if (pt->width0 == 64 && pt->height0 == 64) {
  219.       tex->stride = get_pot_stride(pt->format, pt->width0);
  220.       tex->total_nblocksy = align_nblocksy(pt->format, pt->height0, 8);
  221.    } else {
  222.       return FALSE;
  223.    }
  224.  
  225. #if DEBUG_TEXTURE
  226.    debug_printf("%s size: %d,%d,%d offset %d,%d (0x%x)\n", __FUNCTION__,
  227.       pt->width0, pt->height0, util_format_get_blocksize(pt->format),
  228.       tex->stride, tex->total_nblocksy, tex->stride * tex->total_nblocksy);
  229. #endif
  230.  
  231.    return TRUE;
  232. }
  233.  
  234. /**
  235.  * Special case to deal with shared textures.
  236.  */
  237. static boolean
  238. i9x5_display_target_layout(struct i915_texture *tex)
  239. {
  240.    struct pipe_resource *pt = &tex->b.b;
  241.  
  242.    if (pt->last_level > 0 || util_format_get_blocksize(pt->format) != 4)
  243.       return FALSE;
  244.  
  245.    /* fallback to normal textures for small textures */
  246.    if (pt->width0 < 240)
  247.       return FALSE;
  248.  
  249.    i915_texture_set_level_info(tex, 0, 1);
  250.    i915_texture_set_image_offset(tex, 0, 0, 0, 0);
  251.  
  252.    tex->stride = align(util_format_get_stride(pt->format, pt->width0), 64);
  253.    tex->total_nblocksy = align_nblocksy(pt->format, pt->height0, 8);
  254.    tex->tiling = I915_TILE_X;
  255.  
  256. #if DEBUG_TEXTURE
  257.    debug_printf("%s size: %d,%d,%d offset %d,%d (0x%x)\n", __FUNCTION__,
  258.       pt->width0, pt->height0, util_format_get_blocksize(pt->format),
  259.       tex->stride, tex->total_nblocksy, tex->stride * tex->total_nblocksy);
  260. #endif
  261.  
  262.    return TRUE;
  263. }
  264.  
  265. /**
  266.  * Helper function for special layouts
  267.  */
  268. static boolean
  269. i9x5_special_layout(struct i915_texture *tex)
  270. {
  271.    struct pipe_resource *pt = &tex->b.b;
  272.  
  273.    /* Scanouts needs special care */
  274.    if (pt->bind & PIPE_BIND_SCANOUT)
  275.       if (i9x5_scanout_layout(tex))
  276.          return TRUE;
  277.  
  278.    /* Shared buffers needs to be compatible with X servers
  279.     *
  280.     * XXX: need a better name than shared for this if it is to be part
  281.     * of core gallium, and probably move the flag to resource.flags,
  282.     * rather than bindings.
  283.     */
  284.    if (pt->bind & (PIPE_BIND_SHARED | PIPE_BIND_DISPLAY_TARGET))
  285.       if (i9x5_display_target_layout(tex))
  286.          return TRUE;
  287.  
  288.    return FALSE;
  289. }
  290.  
  291. /**
  292.  * Cube layout used on i915 and for non-compressed textures on i945.
  293.  */
  294. static void
  295. i9x5_texture_layout_cube(struct i915_texture *tex)
  296. {
  297.    struct pipe_resource *pt = &tex->b.b;
  298.    unsigned width = util_next_power_of_two(pt->width0);
  299.    const unsigned nblocks = util_format_get_nblocksx(pt->format, width);
  300.    unsigned level;
  301.    unsigned face;
  302.  
  303.    assert(pt->width0 == pt->height0); /* cubemap images are square */
  304.  
  305.    /* double pitch for cube layouts */
  306.    tex->stride = align(nblocks * util_format_get_blocksize(pt->format) * 2, 4);
  307.    tex->total_nblocksy = nblocks * 4;
  308.  
  309.    for (level = 0; level <= pt->last_level; level++)
  310.       i915_texture_set_level_info(tex, level, 6);
  311.  
  312.    for (face = 0; face < 6; face++) {
  313.       unsigned x = initial_offsets[face][0] * nblocks;
  314.       unsigned y = initial_offsets[face][1] * nblocks;
  315.       unsigned d = nblocks;
  316.  
  317.       for (level = 0; level <= pt->last_level; level++) {
  318.          i915_texture_set_image_offset(tex, level, face, x, y);
  319.          d >>= 1;
  320.          x += step_offsets[face][0] * d;
  321.          y += step_offsets[face][1] * d;
  322.       }
  323.    }
  324. }
  325.  
  326.  
  327. /*
  328.  * i915 layout functions
  329.  */
  330.  
  331.  
  332. static void
  333. i915_texture_layout_2d(struct i915_texture *tex)
  334. {
  335.    struct pipe_resource *pt = &tex->b.b;
  336.    unsigned level;
  337.    unsigned width = util_next_power_of_two(pt->width0);
  338.    unsigned height = util_next_power_of_two(pt->height0);
  339.    unsigned nblocksy = util_format_get_nblocksy(pt->format, width);
  340.    unsigned align_y = 2;
  341.  
  342.    if (util_format_is_s3tc(pt->format))
  343.       align_y = 1;
  344.  
  345.    tex->stride = align(util_format_get_stride(pt->format, width), 4);
  346.    tex->total_nblocksy = 0;
  347.  
  348.    for (level = 0; level <= pt->last_level; level++) {
  349.       i915_texture_set_level_info(tex, level, 1);
  350.       i915_texture_set_image_offset(tex, level, 0, 0, tex->total_nblocksy);
  351.  
  352.       tex->total_nblocksy += nblocksy;
  353.  
  354.       width = u_minify(width, 1);
  355.       height = u_minify(height, 1);
  356.       nblocksy = align_nblocksy(pt->format, height, align_y);
  357.    }
  358. }
  359.  
  360. static void
  361. i915_texture_layout_3d(struct i915_texture *tex)
  362. {
  363.    struct pipe_resource *pt = &tex->b.b;
  364.    unsigned level;
  365.  
  366.    unsigned width = util_next_power_of_two(pt->width0);
  367.    unsigned height = util_next_power_of_two(pt->height0);
  368.    unsigned depth = util_next_power_of_two(pt->depth0);
  369.    unsigned nblocksy = util_format_get_nblocksy(pt->format, height);
  370.    unsigned stack_nblocksy = 0;
  371.  
  372.    /* Calculate the size of a single slice.
  373.     */
  374.    tex->stride = align(util_format_get_stride(pt->format, width), 4);
  375.  
  376.    /* XXX: hardware expects/requires 9 levels at minimum.
  377.     */
  378.    for (level = 0; level <= MAX2(8, pt->last_level); level++) {
  379.       i915_texture_set_level_info(tex, level, depth);
  380.  
  381.       stack_nblocksy += MAX2(2, nblocksy);
  382.  
  383.       width = u_minify(width, 1);
  384.       height = u_minify(height, 1);
  385.       nblocksy = util_format_get_nblocksy(pt->format, height);
  386.    }
  387.  
  388.    /* Fixup depth image_offsets:
  389.     */
  390.    for (level = 0; level <= pt->last_level; level++) {
  391.       unsigned i;
  392.       for (i = 0; i < depth; i++)
  393.          i915_texture_set_image_offset(tex, level, i, 0, i * stack_nblocksy);
  394.  
  395.       depth = u_minify(depth, 1);
  396.    }
  397.  
  398.    /* Multiply slice size by texture depth for total size.  It's
  399.     * remarkable how wasteful of memory the i915 texture layouts
  400.     * are.  They are largely fixed in the i945.
  401.     */
  402.    tex->total_nblocksy = stack_nblocksy * util_next_power_of_two(pt->depth0);
  403. }
  404.  
  405. static boolean
  406. i915_texture_layout(struct i915_texture * tex)
  407. {
  408.    switch (tex->b.b.target) {
  409.    case PIPE_TEXTURE_1D:
  410.    case PIPE_TEXTURE_2D:
  411.    case PIPE_TEXTURE_RECT:
  412.       if (!i9x5_special_layout(tex))
  413.          i915_texture_layout_2d(tex);
  414.       break;
  415.    case PIPE_TEXTURE_3D:
  416.       i915_texture_layout_3d(tex);
  417.       break;
  418.    case PIPE_TEXTURE_CUBE:
  419.       i9x5_texture_layout_cube(tex);
  420.       break;
  421.    default:
  422.       assert(0);
  423.       return FALSE;
  424.    }
  425.  
  426.    return TRUE;
  427. }
  428.  
  429.  
  430. /*
  431.  * i945 layout functions
  432.  */
  433.  
  434.  
  435. static void
  436. i945_texture_layout_2d(struct i915_texture *tex)
  437. {
  438.    struct pipe_resource *pt = &tex->b.b;
  439.    int align_x = 4, align_y = 2;
  440.    unsigned level;
  441.    unsigned x = 0;
  442.    unsigned y = 0;
  443.    unsigned width = util_next_power_of_two(pt->width0);
  444.    unsigned height = util_next_power_of_two(pt->height0);
  445.    unsigned nblocksx = util_format_get_nblocksx(pt->format, width);
  446.    unsigned nblocksy = util_format_get_nblocksy(pt->format, height);
  447.  
  448.    if (util_format_is_s3tc(pt->format)) {
  449.       align_x = 1;
  450.       align_y = 1;
  451.    }
  452.  
  453.    tex->stride = align(util_format_get_stride(pt->format, width), 4);
  454.  
  455.    /* May need to adjust pitch to accommodate the placement of
  456.     * the 2nd mipmap level.  This occurs when the alignment
  457.     * constraints of mipmap placement push the right edge of the
  458.     * 2nd mipmap level out past the width of its parent.
  459.     */
  460.    if (pt->last_level > 0) {
  461.       unsigned mip1_nblocksx =
  462.          align_nblocksx(pt->format, u_minify(width, 1), align_x) +
  463.          util_format_get_nblocksx(pt->format, u_minify(width, 2));
  464.  
  465.       if (mip1_nblocksx > nblocksx)
  466.          tex->stride = mip1_nblocksx * util_format_get_blocksize(pt->format);
  467.    }
  468.  
  469.    /* Pitch must be a whole number of dwords
  470.     */
  471.    tex->stride = align(tex->stride, 64);
  472.    tex->total_nblocksy = 0;
  473.  
  474.    for (level = 0; level <= pt->last_level; level++) {
  475.       i915_texture_set_level_info(tex, level, 1);
  476.       i915_texture_set_image_offset(tex, level, 0, x, y);
  477.  
  478.       /* Because the images are packed better, the final offset
  479.        * might not be the maximal one:
  480.        */
  481.       tex->total_nblocksy = MAX2(tex->total_nblocksy, y + nblocksy);
  482.  
  483.       /* Layout_below: step right after second mipmap level.
  484.        */
  485.       if (level == 1) {
  486.          x += nblocksx;
  487.       } else {
  488.          y += nblocksy;
  489.       }
  490.  
  491.       width  = u_minify(width, 1);
  492.       height = u_minify(height, 1);
  493.       nblocksx = align_nblocksx(pt->format, width, align_x);
  494.       nblocksy = align_nblocksy(pt->format, height, align_y);
  495.    }
  496. }
  497.  
  498. static void
  499. i945_texture_layout_3d(struct i915_texture *tex)
  500. {
  501.    struct pipe_resource *pt = &tex->b.b;
  502.    unsigned width = util_next_power_of_two(pt->width0);
  503.    unsigned height = util_next_power_of_two(pt->height0);
  504.    unsigned depth = util_next_power_of_two(pt->depth0);
  505.    unsigned nblocksy = util_format_get_nblocksy(pt->format, width);
  506.    unsigned pack_x_pitch, pack_x_nr;
  507.    unsigned pack_y_pitch;
  508.    unsigned level;
  509.  
  510.    tex->stride = align(util_format_get_stride(pt->format, width), 4);
  511.    tex->total_nblocksy = 0;
  512.  
  513.    pack_y_pitch = MAX2(nblocksy, 2);
  514.    pack_x_pitch = tex->stride / util_format_get_blocksize(pt->format);
  515.    pack_x_nr = 1;
  516.  
  517.    for (level = 0; level <= pt->last_level; level++) {
  518.       int x = 0;
  519.       int y = 0;
  520.       unsigned q, j;
  521.  
  522.       i915_texture_set_level_info(tex, level, depth);
  523.  
  524.       for (q = 0; q < depth;) {
  525.          for (j = 0; j < pack_x_nr && q < depth; j++, q++) {
  526.             i915_texture_set_image_offset(tex, level, q, x, y + tex->total_nblocksy);
  527.             x += pack_x_pitch;
  528.          }
  529.  
  530.          x = 0;
  531.          y += pack_y_pitch;
  532.       }
  533.  
  534.       tex->total_nblocksy += y;
  535.  
  536.       if (pack_x_pitch > 4) {
  537.          pack_x_pitch >>= 1;
  538.          pack_x_nr <<= 1;
  539.          assert(pack_x_pitch * pack_x_nr * util_format_get_blocksize(pt->format) <= tex->stride);
  540.       }
  541.  
  542.       if (pack_y_pitch > 2) {
  543.          pack_y_pitch >>= 1;
  544.       }
  545.  
  546.       width = u_minify(width, 1);
  547.       height = u_minify(height, 1);
  548.       depth = u_minify(depth, 1);
  549.       nblocksy = util_format_get_nblocksy(pt->format, height);
  550.    }
  551. }
  552.  
  553. static void
  554. i945_texture_layout_cube(struct i915_texture *tex)
  555. {
  556.    struct pipe_resource *pt = &tex->b.b;
  557.    unsigned width = util_next_power_of_two(pt->width0);
  558.    const unsigned nblocks = util_format_get_nblocksx(pt->format, width);
  559.    const unsigned dim = width;
  560.    unsigned level;
  561.    unsigned face;
  562.  
  563.    assert(pt->width0 == pt->height0); /* cubemap images are square */
  564.    assert(util_format_is_s3tc(pt->format)); /* compressed only */
  565.  
  566.    /*
  567.     * Depending on the size of the largest images, pitch can be
  568.     * determined either by the old-style packing of cubemap faces,
  569.     * or the final row of 4x4, 2x2 and 1x1 faces below this.
  570.     *
  571.     * 64  * 2 / 4 = 32
  572.     * 14 * 2 = 28
  573.     */
  574.    if (width >= 64)
  575.       tex->stride = nblocks * 2 * util_format_get_blocksize(pt->format);
  576.    else
  577.       tex->stride = 14 * 2 * util_format_get_blocksize(pt->format);
  578.  
  579.    /*
  580.     * Something similary apply for height as well.
  581.     */
  582.    if (width >= 4)
  583.       tex->total_nblocksy = nblocks * 4 + 1;
  584.    else
  585.       tex->total_nblocksy = 1;
  586.  
  587.    /* Set all the levels to effectively occupy the whole rectangular region */
  588.    for (level = 0; level <= pt->last_level; level++)
  589.       i915_texture_set_level_info(tex, level, 6);
  590.  
  591.    for (face = 0; face < 6; face++) {
  592.       /* all calculations in pixels */
  593.       unsigned total_height = tex->total_nblocksy * 4;
  594.       unsigned x = initial_offsets[face][0] * dim;
  595.       unsigned y = initial_offsets[face][1] * dim;
  596.       unsigned d = dim;
  597.  
  598.       if (dim == 4 && face >= 4) {
  599.          x = (face - 4) * 8;
  600.          y = tex->total_nblocksy * 4 - 4; /* 4 = 1 block */
  601.       } else if (dim < 4 && (face > 0)) {
  602.          x = face * 8;
  603.          y = total_height - 4;
  604.       }
  605.  
  606.       for (level = 0; level <= pt->last_level; level++) {
  607.          i915_texture_set_image_offset(tex, level, face,
  608.                                        util_format_get_nblocksx(pt->format, x),
  609.                                        util_format_get_nblocksy(pt->format, y));
  610.  
  611.          d >>= 1;
  612.  
  613.          switch (d) {
  614.          case 4:
  615.             switch (face) {
  616.             case PIPE_TEX_FACE_POS_X:
  617.             case PIPE_TEX_FACE_NEG_X:
  618.                x += step_offsets[face][0] * d;
  619.                y += step_offsets[face][1] * d;
  620.                break;
  621.             case PIPE_TEX_FACE_POS_Y:
  622.             case PIPE_TEX_FACE_NEG_Y:
  623.                y += 12;
  624.                x -= 8;
  625.                break;
  626.             case PIPE_TEX_FACE_POS_Z:
  627.             case PIPE_TEX_FACE_NEG_Z:
  628.                y = total_height - 4;
  629.                x = (face - 4) * 8;
  630.                break;
  631.             }
  632.             break;
  633.          case 2:
  634.             y = total_height - 4;
  635.             x = bottom_offsets[face];
  636.             break;
  637.          case 1:
  638.             x += 48;
  639.             break;
  640.          default:
  641.             x += step_offsets[face][0] * d;
  642.             y += step_offsets[face][1] * d;
  643.             break;
  644.          }
  645.       }
  646.    }
  647. }
  648.  
  649. static boolean
  650. i945_texture_layout(struct i915_texture * tex)
  651. {
  652.    switch (tex->b.b.target) {
  653.    case PIPE_TEXTURE_1D:
  654.    case PIPE_TEXTURE_2D:
  655.    case PIPE_TEXTURE_RECT:
  656.       if (!i9x5_special_layout(tex))
  657.          i945_texture_layout_2d(tex);
  658.       break;
  659.    case PIPE_TEXTURE_3D:
  660.       i945_texture_layout_3d(tex);
  661.       break;
  662.    case PIPE_TEXTURE_CUBE:
  663.       if (!util_format_is_s3tc(tex->b.b.format))
  664.          i9x5_texture_layout_cube(tex);
  665.       else
  666.          i945_texture_layout_cube(tex);
  667.       break;
  668.    default:
  669.       assert(0);
  670.       return FALSE;
  671.    }
  672.  
  673.    return TRUE;
  674. }
  675.  
  676.  
  677.  
  678. /*
  679.  * Screen texture functions
  680.  */
  681.  
  682.  
  683.  
  684. static boolean
  685. i915_texture_get_handle(struct pipe_screen * screen,
  686.                         struct pipe_resource *texture,
  687.                         struct winsys_handle *whandle)
  688. {
  689.    struct i915_screen *is = i915_screen(screen);
  690.    struct i915_texture *tex = i915_texture(texture);
  691.    struct i915_winsys *iws = is->iws;
  692.  
  693.    return iws->buffer_get_handle(iws, tex->buffer, whandle, tex->stride);
  694. }
  695.  
  696.  
  697. static void
  698. i915_texture_destroy(struct pipe_screen *screen,
  699.                      struct pipe_resource *pt)
  700. {
  701.    struct i915_texture *tex = i915_texture(pt);
  702.    struct i915_winsys *iws = i915_screen(screen)->iws;
  703.    uint i;
  704.  
  705.    if (tex->buffer)
  706.       iws->buffer_destroy(iws, tex->buffer);
  707.  
  708.    for (i = 0; i < Elements(tex->image_offset); i++)
  709.       FREE(tex->image_offset[i]);
  710.  
  711.    FREE(tex);
  712. }
  713.  
  714. static void *
  715. i915_texture_transfer_map(struct pipe_context *pipe,
  716.                           struct pipe_resource *resource,
  717.                           unsigned level,
  718.                           unsigned usage,
  719.                           const struct pipe_box *box,
  720.                           struct pipe_transfer **ptransfer)
  721. {
  722.    struct i915_context *i915 = i915_context(pipe);
  723.    struct i915_texture *tex = i915_texture(resource);
  724.    struct i915_transfer *transfer = util_slab_alloc(&i915->texture_transfer_pool);
  725.    boolean use_staging_texture = FALSE;
  726.    struct i915_winsys *iws = i915_screen(pipe->screen)->iws;
  727.    enum pipe_format format = resource->format;
  728.    unsigned offset;
  729.    char *map;
  730.  
  731.    if (transfer == NULL)
  732.       return NULL;
  733.  
  734.    transfer->b.resource = resource;
  735.    transfer->b.level = level;
  736.    transfer->b.usage = usage;
  737.    transfer->b.box = *box;
  738.    transfer->b.stride = tex->stride;
  739.    transfer->staging_texture = NULL;
  740.    /* XXX: handle depth textures everyhwere*/
  741.    transfer->b.layer_stride = 0;
  742.  
  743.    /* if we use staging transfers, only support textures we can render to,
  744.     * because we need that for u_blitter */
  745.    if (i915->blitter &&
  746.        util_blitter_is_copy_supported(i915->blitter, resource, resource) &&
  747.        (usage & PIPE_TRANSFER_WRITE) &&
  748.        !(usage & (PIPE_TRANSFER_READ | PIPE_TRANSFER_DONTBLOCK | PIPE_TRANSFER_UNSYNCHRONIZED)))
  749.       use_staging_texture = TRUE;
  750.  
  751.    use_staging_texture = FALSE;
  752.  
  753.    if (use_staging_texture) {
  754.       /*
  755.        * Allocate the untiled staging texture.
  756.        * If the alloc fails, transfer->staging_texture is NULL and we fallback to a map()
  757.        */
  758.       transfer->staging_texture = i915_texture_create(pipe->screen, resource, TRUE);
  759.    }
  760.  
  761.    if (resource->target != PIPE_TEXTURE_3D &&
  762.        resource->target != PIPE_TEXTURE_CUBE)
  763.       assert(box->z == 0);
  764.  
  765.    if (transfer->staging_texture) {
  766.       tex = i915_texture(transfer->staging_texture);
  767.    } else {
  768.       /* TODO this is a sledgehammer */
  769.       tex = i915_texture(resource);
  770.       pipe->flush(pipe, NULL, 0);
  771.    }
  772.  
  773.    offset = i915_texture_offset(tex, transfer->b.level, box->z);
  774.  
  775.    map = iws->buffer_map(iws, tex->buffer,
  776.                          (transfer->b.usage & PIPE_TRANSFER_WRITE) ? TRUE : FALSE);
  777.    if (map == NULL) {
  778.       pipe_resource_reference(&transfer->staging_texture, NULL);
  779.       FREE(transfer);
  780.       return NULL;
  781.    }
  782.  
  783.    *ptransfer = &transfer->b;
  784.  
  785.    return map + offset +
  786.       box->y / util_format_get_blockheight(format) * transfer->b.stride +
  787.       box->x / util_format_get_blockwidth(format) * util_format_get_blocksize(format);
  788. }
  789.  
  790. static void
  791. i915_texture_transfer_unmap(struct pipe_context *pipe,
  792.                             struct pipe_transfer *transfer)
  793. {
  794.    struct i915_context *i915 = i915_context(pipe);
  795.    struct i915_transfer *itransfer = (struct i915_transfer*)transfer;
  796.    struct i915_texture *tex = i915_texture(itransfer->b.resource);
  797.    struct i915_winsys *iws = i915_screen(tex->b.b.screen)->iws;
  798.  
  799.    if (itransfer->staging_texture)
  800.       tex = i915_texture(itransfer->staging_texture);
  801.  
  802.    iws->buffer_unmap(iws, tex->buffer);
  803.  
  804.    if ((itransfer->staging_texture) &&
  805.        (transfer->usage & PIPE_TRANSFER_WRITE)) {
  806.       struct pipe_box sbox;
  807.  
  808.       u_box_origin_2d(itransfer->b.box.width, itransfer->b.box.height, &sbox);
  809.       pipe->resource_copy_region(pipe, itransfer->b.resource, itransfer->b.level,
  810.                                    itransfer->b.box.x, itransfer->b.box.y, itransfer->b.box.z,
  811.                                    itransfer->staging_texture,
  812.                                    0, &sbox);
  813.       pipe->flush(pipe, NULL, 0);
  814.       pipe_resource_reference(&itransfer->staging_texture, NULL);
  815.    }
  816.  
  817.    util_slab_free(&i915->texture_transfer_pool, itransfer);
  818. }
  819.  
  820. #if 0
  821. static void i915_transfer_inline_write( struct pipe_context *pipe,
  822.                                  struct pipe_resource *resource,
  823.                                  unsigned level,
  824.                                  unsigned usage,
  825.                                  const struct pipe_box *box,
  826.                                  const void *data,
  827.                                  unsigned stride,
  828.                                  unsigned layer_stride)
  829. {
  830.    struct pipe_transfer *transfer = NULL;
  831.    struct i915_transfer *itransfer = NULL;
  832.    const uint8_t *src_data = data;
  833.    unsigned i;
  834.  
  835.    transfer = pipe->transfer_get(pipe,
  836.                                  resource,
  837.                                  level,
  838.                                  usage,
  839.                                  box );
  840.    if (transfer == NULL)
  841.       goto out;
  842.  
  843.    itransfer = (struct i915_transfer*)transfer;
  844.  
  845.    if (itransfer->staging_texture) {
  846.       struct i915_texture *tex = i915_texture(itransfer->staging_texture);
  847.       enum pipe_format format = tex->b.b.format;
  848.       struct i915_winsys *iws = i915_screen(tex->b.b.screen)->iws;
  849.       size_t offset;
  850.       size_t size;
  851.  
  852.       offset = i915_texture_offset(tex, transfer->level, transfer->box.z);
  853.  
  854.       for (i = 0; i < box->depth; i++) {
  855.          if (!tex->b.b.last_level &&
  856.                      tex->b.b.width0 == transfer->box.width) {
  857.              unsigned nby = util_format_get_nblocksy(format, transfer->box.y);
  858.              assert(!offset);
  859.              assert(!transfer->box.x);
  860.              assert(tex->stride == transfer->stride);
  861.  
  862.              offset += tex->stride * nby;
  863.              size = util_format_get_2d_size(format, transfer->stride,
  864.                              transfer->box.height);
  865.              iws->buffer_write(iws, tex->buffer, offset, size, transfer->data);
  866.  
  867.          } else {
  868.              unsigned nby = util_format_get_nblocksy(format, transfer->box.y);
  869.              int i;
  870.              offset += util_format_get_stride(format, transfer->box.x);
  871.              size = transfer->stride;
  872.  
  873.              for (i = 0; i < nby; i++) {
  874.                      iws->buffer_write(iws, tex->buffer, offset, size, transfer->data);
  875.                      offset += tex->stride;
  876.              }
  877.          }
  878.          offset += layer_stride;
  879.       }
  880.    } else {
  881.       uint8_t *map = pipe_transfer_map(pipe, &itransfer->b);
  882.       if (map == NULL)
  883.          goto nomap;
  884.  
  885.       for (i = 0; i < box->depth; i++) {
  886.          util_copy_rect(map,
  887.                         resource->format,
  888.                         itransfer->b.stride, /* bytes */
  889.                         0, 0,
  890.                         box->width,
  891.                         box->height,
  892.                         src_data,
  893.                         stride,       /* bytes */
  894.                         0, 0);
  895.          map += itransfer->b.layer_stride;
  896.          src_data += layer_stride;
  897.       }
  898. nomap:
  899.       if (map)
  900.          pipe_transfer_unmap(pipe, &itransfer->b);
  901.    }
  902.  
  903. out:
  904.    if (itransfer)
  905.       pipe_transfer_destroy(pipe, &itransfer->b);
  906. }
  907. #endif
  908.  
  909. struct u_resource_vtbl i915_texture_vtbl =
  910. {
  911.    i915_texture_get_handle,           /* get_handle */
  912.    i915_texture_destroy,              /* resource_destroy */
  913.    i915_texture_transfer_map,         /* transfer_map */
  914.    u_default_transfer_flush_region,   /* transfer_flush_region */
  915.    i915_texture_transfer_unmap,       /* transfer_unmap */
  916.    u_default_transfer_inline_write    /* transfer_inline_write */
  917. };
  918.  
  919.  
  920. struct pipe_resource *
  921. i915_texture_create(struct pipe_screen *screen,
  922.                     const struct pipe_resource *template,
  923.                     boolean force_untiled)
  924. {
  925.    struct i915_screen *is = i915_screen(screen);
  926.    struct i915_winsys *iws = is->iws;
  927.    struct i915_texture *tex = CALLOC_STRUCT(i915_texture);
  928.    unsigned buf_usage = 0;
  929.  
  930.    if (!tex)
  931.       return NULL;
  932.  
  933.    tex->b.b = *template;
  934.    tex->b.vtbl = &i915_texture_vtbl;
  935.    pipe_reference_init(&tex->b.b.reference, 1);
  936.    tex->b.b.screen = screen;
  937.  
  938.    if ( (force_untiled) || (template->usage == PIPE_USAGE_STREAM) )
  939.       tex->tiling = I915_TILE_NONE;
  940.    else
  941.       tex->tiling = i915_texture_tiling(is, tex);
  942.  
  943.    if (is->is_i945) {
  944.       if (!i945_texture_layout(tex))
  945.          goto fail;
  946.    } else {
  947.       if (!i915_texture_layout(tex))
  948.          goto fail;
  949.    }
  950.  
  951.    /* for scanouts and cursors, cursors arn't scanouts */
  952.  
  953.    /* XXX: use a custom flag for cursors, don't rely on magically
  954.     * guessing that this is Xorg asking for a cursor
  955.     */
  956.    if ((template->bind & PIPE_BIND_SCANOUT) && template->width0 != 64)
  957.       buf_usage = I915_NEW_SCANOUT;
  958.    else
  959.       buf_usage = I915_NEW_TEXTURE;
  960.  
  961.    tex->buffer = iws->buffer_create_tiled(iws, &tex->stride, tex->total_nblocksy,
  962.                                              &tex->tiling, buf_usage);
  963.    if (!tex->buffer)
  964.       goto fail;
  965.  
  966.    I915_DBG(DBG_TEXTURE, "%s: %p stride %u, blocks (%u, %u) tiling %s\n", __func__,
  967.             tex, tex->stride,
  968.             tex->stride / util_format_get_blocksize(tex->b.b.format),
  969.             tex->total_nblocksy, get_tiling_string(tex->tiling));
  970.  
  971.    return &tex->b.b;
  972.  
  973. fail:
  974.    FREE(tex);
  975.    return NULL;
  976. }
  977.  
  978. struct pipe_resource *
  979. i915_texture_from_handle(struct pipe_screen * screen,
  980.                           const struct pipe_resource *template,
  981.                           struct winsys_handle *whandle)
  982. {
  983.    struct i915_screen *is = i915_screen(screen);
  984.    struct i915_texture *tex;
  985.    struct i915_winsys *iws = is->iws;
  986.    struct i915_winsys_buffer *buffer;
  987.    unsigned stride;
  988.    enum i915_winsys_buffer_tile tiling;
  989.  
  990.    assert(screen);
  991.  
  992.    buffer = iws->buffer_from_handle(iws, whandle, template->height0, &tiling, &stride);
  993.  
  994.    /* Only supports one type */
  995.    if ((template->target != PIPE_TEXTURE_2D &&
  996.        template->target != PIPE_TEXTURE_RECT) ||
  997.        template->last_level != 0 ||
  998.        template->depth0 != 1) {
  999.       return NULL;
  1000.    }
  1001.  
  1002.    tex = CALLOC_STRUCT(i915_texture);
  1003.    if (!tex)
  1004.       return NULL;
  1005.  
  1006.    tex->b.b = *template;
  1007.    tex->b.vtbl = &i915_texture_vtbl;
  1008.    pipe_reference_init(&tex->b.b.reference, 1);
  1009.    tex->b.b.screen = screen;
  1010.  
  1011.    tex->stride = stride;
  1012.    tex->tiling = tiling;
  1013.    tex->total_nblocksy = align_nblocksy(tex->b.b.format, tex->b.b.height0, 8);
  1014.  
  1015.    i915_texture_set_level_info(tex, 0, 1);
  1016.    i915_texture_set_image_offset(tex, 0, 0, 0, 0);
  1017.  
  1018.    tex->buffer = buffer;
  1019.  
  1020.    I915_DBG(DBG_TEXTURE, "%s: %p stride %u, blocks (%u, %u) tiling %s\n", __func__,
  1021.             tex, tex->stride,
  1022.             tex->stride / util_format_get_blocksize(tex->b.b.format),
  1023.             tex->total_nblocksy, get_tiling_string(tex->tiling));
  1024.  
  1025.    return &tex->b.b;
  1026. }
  1027.  
  1028.