+/**
+ * Map a texture. Without any synchronization.
+ */
+void *
+llvmpipe_texture_map(struct pipe_texture *texture,
+ unsigned face,
+ unsigned level,
+ unsigned zslice)
+{
+ struct llvmpipe_texture *lpt = llvmpipe_texture(texture);
+ uint8_t *map;
+
+ if (lpt->dt) {
+ /* display target */
+ struct llvmpipe_screen *screen = llvmpipe_screen(texture->screen);
+ struct sw_winsys *winsys = screen->winsys;
+ const unsigned usage = PIPE_BUFFER_USAGE_CPU_READ_WRITE;
+
+ assert(face == 0);
+ assert(level == 0);
+ assert(zslice == 0);
+
+ /* FIXME: keep map count? */
+ map = winsys->displaytarget_map(winsys, lpt->dt, usage);
+ }
+ else {
+ /* regular texture */
+ unsigned offset;
+ unsigned stride;
+
+ map = lpt->data;
+
+ assert(level < LP_MAX_TEXTURE_2D_LEVELS);
+
+ offset = lpt->level_offset[level];
+ stride = lpt->stride[level];
+
+ /* XXX shouldn't that rather be
+ tex_height = align(u_minify(texture->height0, level), 2)
+ to account for alignment done in llvmpipe_texture_layout ?
+ */
+ if (texture->target == PIPE_TEXTURE_CUBE) {
+ unsigned tex_height = u_minify(texture->height0, level);
+ offset += face * util_format_get_nblocksy(texture->format, tex_height) * stride;
+ }
+ else if (texture->target == PIPE_TEXTURE_3D) {
+ unsigned tex_height = u_minify(texture->height0, level);
+ offset += zslice * util_format_get_nblocksy(texture->format, tex_height) * stride;
+ }
+ else {
+ assert(face == 0);
+ assert(zslice == 0);
+ }
+
+ map += offset;
+ }
+
+ return map;
+}
+
+
+/**
+ * Unmap a texture. Without any synchronization.
+ */
+void
+llvmpipe_texture_unmap(struct pipe_texture *texture,
+ unsigned face,
+ unsigned level,
+ unsigned zslice)
+{
+ struct llvmpipe_texture *lpt = llvmpipe_texture(texture);
+
+ if (lpt->dt) {
+ /* display target */
+ struct llvmpipe_screen *lp_screen = llvmpipe_screen(texture->screen);
+ struct sw_winsys *winsys = lp_screen->winsys;
+
+ assert(face == 0);
+ assert(level == 0);
+ assert(zslice == 0);
+
+ winsys->displaytarget_unmap(winsys, lpt->dt);
+ }
+}
+
+
+static struct pipe_texture *
+llvmpipe_texture_from_handle(struct pipe_screen *screen,
+ const struct pipe_texture *template,
+ struct winsys_handle *whandle)
+{
+ struct sw_winsys *winsys = llvmpipe_screen(screen)->winsys;
+ struct llvmpipe_texture *lpt = CALLOC_STRUCT(llvmpipe_texture);
+ if (!lpt)
+ return NULL;
+
+ lpt->base = *template;
+ pipe_reference_init(&lpt->base.reference, 1);
+ lpt->base.screen = screen;
+
+ lpt->dt = winsys->displaytarget_from_handle(winsys,
+ template,
+ whandle,
+ &lpt->stride[0]);
+ if (!lpt->dt)
+ goto fail;
+
+ return &lpt->base;
+
+ fail:
+ FREE(lpt);
+ return NULL;
+}
+
+
+static boolean
+llvmpipe_texture_get_handle(struct pipe_screen *screen,
+ struct pipe_texture *pt,
+ struct winsys_handle *whandle)
+{
+ struct sw_winsys *winsys = llvmpipe_screen(screen)->winsys;
+ struct llvmpipe_texture *lpt = llvmpipe_texture(pt);
+
+ assert(lpt->dt);
+ if (!lpt->dt)
+ return FALSE;
+
+ return winsys->displaytarget_get_handle(winsys, lpt->dt, whandle);
+}
+
+