src/gallium/auxiliary/util/u_surface.c

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  14  * next paragraph) shall be included in all copies or substantial portions
  15  * of the Software.
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  26
  27 /**
  28  * @file
  29  * Surface utility functions.
  30  *
  31  * @author Brian Paul
  32  */
  33
  34
  35 #include "pipe/p_defines.h"
  36 #include "pipe/p_screen.h"
  37 #include "pipe/p_state.h"
  38
  39 #include "util/u_format.h"
  40 #include "util/u_inlines.h"
  41 #include "util/u_rect.h"
  42 #include "util/u_surface.h"
  43 #include "util/u_pack_color.h"
  44
  45
  46 /**
  47  * Helper to quickly create an RGBA rendering surface of a certain size.
  48  * \param textureOut  returns the new texture
  49  * \param surfaceOut  returns the new surface
  50  * \return TRUE for success, FALSE if failure
  51  */
  52 boolean
  53 util_create_rgba_surface(struct pipe_screen *screen,
  54                          uint width, uint height,
  55                          uint bind,
  56                          struct pipe_resource **textureOut,
  57                          struct pipe_surface **surfaceOut)
  58 {
  59    static const enum pipe_format rgbaFormats[] = {
  60       PIPE_FORMAT_B8G8R8A8_UNORM,
  61       PIPE_FORMAT_A8R8G8B8_UNORM,
  62       PIPE_FORMAT_A8B8G8R8_UNORM,
  63       PIPE_FORMAT_NONE
  64    };
  65    const uint target = PIPE_TEXTURE_2D;
  66    enum pipe_format format = PIPE_FORMAT_NONE;
  67    struct pipe_resource templ;
  68    uint i;
  69
  70    /* Choose surface format */
  71    for (i = 0; rgbaFormats[i]; i++) {
  72       if (screen->is_format_supported(screen, rgbaFormats[i],
  73                                       target, 0, bind, 0)) {
  74          format = rgbaFormats[i];
  75          break;
  76       }
  77    }
  78    if (format == PIPE_FORMAT_NONE)
  79       return FALSE;  /* unable to get an rgba format!?! */
  80
  81    /* create texture */
  82    memset(&templ, 0, sizeof(templ));
  83    templ.target = target;
  84    templ.format = format;
  85    templ.last_level = 0;
  86    templ.width0 = width;
  87    templ.height0 = height;
  88    templ.depth0 = 1;
  89    templ.bind = bind;
  90
  91    *textureOut = screen->resource_create(screen, &templ);
  92    if (!*textureOut)
  93       return FALSE;
  94
  95    /* create surface / view into texture */
  96    *surfaceOut = screen->get_tex_surface(screen,
  97                                          *textureOut,
  98                                          0, 0, 0,
  99                                          bind);
 100    if (!*surfaceOut) {
 101       pipe_resource_reference(textureOut, NULL);
 102       return FALSE;
 103    }
 104
 105    return TRUE;
 106 }
 107
 108
 109 /**
 110  * Release the surface and texture from util_create_rgba_surface().
 111  */
 112 void
 113 util_destroy_rgba_surface(struct pipe_resource *texture,
 114                           struct pipe_surface *surface)
 115 {
 116    pipe_surface_reference(&surface, NULL);
 117    pipe_resource_reference(&texture, NULL);
 118 }
 119
 120
 121
 122 /**
 123  * Fallback function for pipe->resource_copy_region().
 124  * Note: (X,Y)=(0,0) is always the upper-left corner.
 125  */
 126 void
 127 util_resource_copy_region(struct pipe_context *pipe,
 128                           struct pipe_resource *dst,
 129                           struct pipe_subresource subdst,
 130                           unsigned dst_x, unsigned dst_y, unsigned dst_z,
 131                           struct pipe_resource *src,
 132                           struct pipe_subresource subsrc,
 133                           unsigned src_x, unsigned src_y, unsigned src_z,
 134                           unsigned w, unsigned h)
 135 {
 136    struct pipe_transfer *src_trans, *dst_trans;
 137    void *dst_map;
 138    const void *src_map;
 139    enum pipe_format src_format, dst_format;
 140
 141    assert(src && dst);
 142    if (!src || !dst)
 143       return;
 144
 145    src_format = src->format;
 146    dst_format = dst->format;
 147
 148    src_trans = pipe_get_transfer(pipe,
 149                                  src,
 150                                  subsrc.face,
 151                                  subsrc.level,
 152                                  src_z,
 153                                  PIPE_TRANSFER_READ,
 154                                  src_x, src_y, w, h);
 155
 156    dst_trans = pipe_get_transfer(pipe,
 157                                  dst,
 158                                  subdst.face,
 159                                  subdst.level,
 160                                  src_z,
 161                                  PIPE_TRANSFER_WRITE,
 162                                  dst_x, dst_y, w, h);
 163
 164    assert(util_format_get_blocksize(dst_format) == util_format_get_blocksize(src_format));
 165    assert(util_format_get_blockwidth(dst_format) == util_format_get_blockwidth(src_format));
 166    assert(util_format_get_blockheight(dst_format) == util_format_get_blockheight(src_format));
 167
 168    src_map = pipe->transfer_map(pipe, src_trans);
 169    dst_map = pipe->transfer_map(pipe, dst_trans);
 170
 171    assert(src_map);
 172    assert(dst_map);
 173
 174    if (src_map && dst_map) {
 175       util_copy_rect(dst_map,
 176                      dst_format,
 177                      dst_trans->stride,
 178                      0, 0,
 179                      w, h,
 180                      src_map,
 181                      src_trans->stride,
 182                      0,
 183                      0);
 184    }
 185
 186    pipe->transfer_unmap(pipe, src_trans);
 187    pipe->transfer_unmap(pipe, dst_trans);
 188
 189    pipe->transfer_destroy(pipe, src_trans);
 190    pipe->transfer_destroy(pipe, dst_trans);
 191 }
 192
 193
 194
 195 #define UBYTE_TO_USHORT(B) ((B) | ((B) << 8))
 196
 197
 198 /**
 199  * Fallback for pipe->clear_render_target() function.
 200  * XXX this looks too hackish to be really useful.
 201  * cpp > 4 looks like a gross hack at best...
 202  * and we're missing the equivalent clear_depth_stencil fallback.
 203  * Plus can't use these transfer fallbacks when clearing
 204  * multisampled surfaces for instance.
 205  */
 206 void
 207 util_clear_render_target(struct pipe_context *pipe,
 208                          struct pipe_surface *dst,
 209                          const float *rgba,
 210                          unsigned dstx, unsigned dsty,
 211                          unsigned width, unsigned height)
 212 {
 213    struct pipe_transfer *dst_trans;
 214    void *dst_map;
 215    union util_color uc;
 216
 217    assert(dst->texture);
 218    if (!dst->texture)
 219       return;
 220    util_pack_color(rgba, dst->texture->format, &uc);
 221    dst_trans = pipe_get_transfer(pipe,
 222                                  dst->texture,
 223                                  dst->face,
 224                                  dst->level,
 225                                  dst->zslice,
 226                                  PIPE_TRANSFER_WRITE,
 227                                  dstx, dsty, width, height);
 228
 229    dst_map = pipe->transfer_map(pipe, dst_trans);
 230
 231    assert(dst_map);
 232
 233    if (dst_map) {
 234       assert(dst_trans->stride > 0);
 235
 236       switch (util_format_get_blocksize(dst->texture->format)) {
 237       case 1:
 238       case 2:
 239       case 4:
 240          util_pack_color(rgba, dst->texture->format, &uc);
 241          util_fill_rect(dst_map, dst->texture->format,
 242                         dst_trans->stride,
 243                         0, 0, width, height, uc.ui);
 244          break;
 245       case 8:
 246       {
 247          /* expand the 4-byte clear value to an 8-byte value */
 248          /* should probably not convert back from ubyte but not
 249             sure what this code really achieved since it doesn't even
 250             check for format type... */
 251          ushort *row = (ushort *) dst_map;
 252          ushort val0 = UBYTE_TO_USHORT((uc.ui >>  0) & 0xff);
 253          ushort val1 = UBYTE_TO_USHORT((uc.ui >>  8) & 0xff);
 254          ushort val2 = UBYTE_TO_USHORT((uc.ui >> 16) & 0xff);
 255          ushort val3 = UBYTE_TO_USHORT((uc.ui >> 24) & 0xff);
 256          unsigned i, j;
 257          val0 = (val0 << 8) | val0;
 258          val1 = (val1 << 8) | val1;
 259          val2 = (val2 << 8) | val2;
 260          val3 = (val3 << 8) | val3;
 261          for (i = 0; i < height; i++) {
 262             for (j = 0; j < width; j++) {
 263                row[j*4+0] = val0;
 264                row[j*4+1] = val1;
 265                row[j*4+2] = val2;
 266                row[j*4+3] = val3;
 267             }
 268             row += dst_trans->stride/2;
 269          }
 270       }
 271       break;
 272       default:
 273          assert(0);
 274          break;
 275       }
 276    }
 277
 278    pipe->transfer_unmap(pipe, dst_trans);
 279    pipe->transfer_destroy(pipe, dst_trans);
 280 }