src/gallium/winsys/sw/dri/dri_sw_winsys.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009, VMware, Inc.
   4  * All Rights Reserved.
   5  * Copyright 2010 George Sapountzis <gsapountzis@gmail.com>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29 #include <sys/ipc.h>
  30 #include <sys/shm.h>
  31
  32 #include "pipe/p_compiler.h"
  33 #include "pipe/p_format.h"
  34 #include "util/u_inlines.h"
  35 #include "util/u_format.h"
  36 #include "util/u_math.h"
  37 #include "util/u_memory.h"
  38
  39 #include "state_tracker/sw_winsys.h"
  40 #include "dri_sw_winsys.h"
  41
  42
  43 struct dri_sw_displaytarget
  44 {
  45    enum pipe_format format;
  46    unsigned width;
  47    unsigned height;
  48    unsigned stride;
  49
  50    unsigned map_flags;
  51    int shmid;
  52    void *data;
  53    void *mapped;
  54    const void *front_private;
  55 };
  56
  57 struct dri_sw_winsys
  58 {
  59    struct sw_winsys base;
  60
  61    struct drisw_loader_funcs *lf;
  62 };
  63
  64 static inline struct dri_sw_displaytarget *
  65 dri_sw_displaytarget( struct sw_displaytarget *dt )
  66 {
  67    return (struct dri_sw_displaytarget *)dt;
  68 }
  69
  70 static inline struct dri_sw_winsys *
  71 dri_sw_winsys( struct sw_winsys *ws )
  72 {
  73    return (struct dri_sw_winsys *)ws;
  74 }
  75
  76
  77 static boolean
  78 dri_sw_is_displaytarget_format_supported( struct sw_winsys *ws,
  79                                           unsigned tex_usage,
  80                                           enum pipe_format format )
  81 {
  82    /* TODO: check visuals or other sensible thing here */
  83    return TRUE;
  84 }
  85
  86 static char *
  87 alloc_shm(struct dri_sw_displaytarget *dri_sw_dt, unsigned size)
  88 {
  89    char *addr;
  90
  91    dri_sw_dt->shmid = shmget(IPC_PRIVATE, size, IPC_CREAT|0777);
  92    if (dri_sw_dt->shmid < 0)
  93       return NULL;
  94
  95    addr = (char *) shmat(dri_sw_dt->shmid, 0, 0);
  96    /* mark the segment immediately for deletion to avoid leaks */
  97    shmctl(dri_sw_dt->shmid, IPC_RMID, 0);
  98
  99    if (addr == (char *) -1)
 100       return NULL;
 101
 102    return addr;
 103 }
 104
 105 static struct sw_displaytarget *
 106 dri_sw_displaytarget_create(struct sw_winsys *winsys,
 107                             unsigned tex_usage,
 108                             enum pipe_format format,
 109                             unsigned width, unsigned height,
 110                             unsigned alignment,
 111                             const void *front_private,
 112                             unsigned *stride)
 113 {
 114    struct dri_sw_winsys *ws = dri_sw_winsys(winsys);
 115    struct dri_sw_displaytarget *dri_sw_dt;
 116    unsigned nblocksy, size, format_stride;
 117
 118    dri_sw_dt = CALLOC_STRUCT(dri_sw_displaytarget);
 119    if(!dri_sw_dt)
 120       goto no_dt;
 121
 122    dri_sw_dt->format = format;
 123    dri_sw_dt->width = width;
 124    dri_sw_dt->height = height;
 125    dri_sw_dt->front_private = front_private;
 126
 127    format_stride = util_format_get_stride(format, width);
 128    dri_sw_dt->stride = align(format_stride, alignment);
 129
 130    nblocksy = util_format_get_nblocksy(format, height);
 131    size = dri_sw_dt->stride * nblocksy;
 132
 133    dri_sw_dt->shmid = -1;
 134    if (ws->lf->put_image_shm)
 135       dri_sw_dt->data = alloc_shm(dri_sw_dt, size);
 136
 137    if(!dri_sw_dt->data)
 138       dri_sw_dt->data = align_malloc(size, alignment);
 139
 140    if(!dri_sw_dt->data)
 141       goto no_data;
 142
 143    *stride = dri_sw_dt->stride;
 144    return (struct sw_displaytarget *)dri_sw_dt;
 145
 146 no_data:
 147    FREE(dri_sw_dt);
 148 no_dt:
 149    return NULL;
 150 }
 151
 152 static void
 153 dri_sw_displaytarget_destroy(struct sw_winsys *ws,
 154                              struct sw_displaytarget *dt)
 155 {
 156    struct dri_sw_displaytarget *dri_sw_dt = dri_sw_displaytarget(dt);
 157
 158    if (dri_sw_dt->shmid >= 0) {
 159       shmdt(dri_sw_dt->data);
 160       shmctl(dri_sw_dt->shmid, IPC_RMID, 0);
 161    } else {
 162       align_free(dri_sw_dt->data);
 163    }
 164
 165    FREE(dri_sw_dt);
 166 }
 167
 168 static void *
 169 dri_sw_displaytarget_map(struct sw_winsys *ws,
 170                          struct sw_displaytarget *dt,
 171                          unsigned flags)
 172 {
 173    struct dri_sw_displaytarget *dri_sw_dt = dri_sw_displaytarget(dt);
 174    dri_sw_dt->mapped = dri_sw_dt->data;
 175
 176    if (dri_sw_dt->front_private && (flags & PIPE_TRANSFER_READ)) {
 177       struct dri_sw_winsys *dri_sw_ws = dri_sw_winsys(ws);
 178       dri_sw_ws->lf->get_image((void *)dri_sw_dt->front_private, 0, 0, dri_sw_dt->width, dri_sw_dt->height, dri_sw_dt->stride, dri_sw_dt->data);
 179    }
 180    dri_sw_dt->map_flags = flags;
 181    return dri_sw_dt->mapped;
 182 }
 183
 184 static void
 185 dri_sw_displaytarget_unmap(struct sw_winsys *ws,
 186                            struct sw_displaytarget *dt)
 187 {
 188    struct dri_sw_displaytarget *dri_sw_dt = dri_sw_displaytarget(dt);
 189    if (dri_sw_dt->front_private && (dri_sw_dt->map_flags & PIPE_TRANSFER_WRITE)) {
 190       struct dri_sw_winsys *dri_sw_ws = dri_sw_winsys(ws);
 191       dri_sw_ws->lf->put_image2((void *)dri_sw_dt->front_private, dri_sw_dt->data, 0, 0, dri_sw_dt->width, dri_sw_dt->height, dri_sw_dt->stride);
 192    }
 193    dri_sw_dt->map_flags = 0;
 194    dri_sw_dt->mapped = NULL;
 195 }
 196
 197 static struct sw_displaytarget *
 198 dri_sw_displaytarget_from_handle(struct sw_winsys *winsys,
 199                                  const struct pipe_resource *templ,
 200                                  struct winsys_handle *whandle,
 201                                  unsigned *stride)
 202 {
 203    assert(0);
 204    return NULL;
 205 }
 206
 207 static boolean
 208 dri_sw_displaytarget_get_handle(struct sw_winsys *winsys,
 209                                 struct sw_displaytarget *dt,
 210                                 struct winsys_handle *whandle)
 211 {
 212    struct dri_sw_displaytarget *dri_sw_dt = dri_sw_displaytarget(dt);
 213
 214    if (whandle->type == WINSYS_HANDLE_TYPE_SHMID) {
 215       if (dri_sw_dt->shmid < 0)
 216          return FALSE;
 217       whandle->handle = dri_sw_dt->shmid;
 218       return TRUE;
 219    }
 220
 221    return FALSE;
 222 }
 223
 224 static void
 225 dri_sw_displaytarget_display(struct sw_winsys *ws,
 226                              struct sw_displaytarget *dt,
 227                              void *context_private,
 228                              struct pipe_box *box)
 229 {
 230    struct dri_sw_winsys *dri_sw_ws = dri_sw_winsys(ws);
 231    struct dri_sw_displaytarget *dri_sw_dt = dri_sw_displaytarget(dt);
 232    struct dri_drawable *dri_drawable = (struct dri_drawable *)context_private;
 233    unsigned width, height, x = 0, y = 0;
 234    unsigned blsize = util_format_get_blocksize(dri_sw_dt->format);
 235    unsigned offset = 0;
 236    void *data = dri_sw_dt->data;
 237
 238    /* Set the width to 'stride / cpp'.
 239     *
 240     * PutImage correctly clips to the width of the dst drawable.
 241     */
 242    if (box) {
 243       offset = (dri_sw_dt->stride * box->y) + box->x * blsize;
 244       data += offset;
 245       x = box->x;
 246       y = box->y;
 247       width = box->width;
 248       height = box->height;
 249    } else {
 250       width = dri_sw_dt->stride / blsize;
 251       height = dri_sw_dt->height;
 252    }
 253
 254    if (dri_sw_dt->shmid != -1) {
 255       dri_sw_ws->lf->put_image_shm(dri_drawable, dri_sw_dt->shmid, dri_sw_dt->data, offset,
 256                                    x, y, width, height, dri_sw_dt->stride);
 257       return;
 258    }
 259
 260    if (box)
 261       dri_sw_ws->lf->put_image2(dri_drawable, data,
 262                                 x, y, width, height, dri_sw_dt->stride);
 263    else
 264       dri_sw_ws->lf->put_image(dri_drawable, data, width, height);
 265 }
 266
 267 static void
 268 dri_destroy_sw_winsys(struct sw_winsys *winsys)
 269 {
 270    FREE(winsys);
 271 }
 272
 273 struct sw_winsys *
 274 dri_create_sw_winsys(struct drisw_loader_funcs *lf)
 275 {
 276    struct dri_sw_winsys *ws;
 277
 278    ws = CALLOC_STRUCT(dri_sw_winsys);
 279    if (!ws)
 280       return NULL;
 281
 282    ws->lf = lf;
 283    ws->base.destroy = dri_destroy_sw_winsys;
 284
 285    ws->base.is_displaytarget_format_supported = dri_sw_is_displaytarget_format_supported;
 286
 287    /* screen texture functions */
 288    ws->base.displaytarget_create = dri_sw_displaytarget_create;
 289    ws->base.displaytarget_destroy = dri_sw_displaytarget_destroy;
 290    ws->base.displaytarget_from_handle = dri_sw_displaytarget_from_handle;
 291    ws->base.displaytarget_get_handle = dri_sw_displaytarget_get_handle;
 292
 293    /* texture functions */
 294    ws->base.displaytarget_map = dri_sw_displaytarget_map;
 295    ws->base.displaytarget_unmap = dri_sw_displaytarget_unmap;
 296
 297    ws->base.displaytarget_display = dri_sw_displaytarget_display;
 298
 299    return &ws->base;
 300 }
 301
 302 /* vim: set sw=3 ts=8 sts=3 expandtab: */