/**
* Map a resource for read/write.
*/
void *
llvmpipe_resource_map(struct pipe_resource *resource,
unsigned level,
unsigned layer,
enum lp_texture_usage tex_usage)
{
struct llvmpipe_resource *lpr = llvmpipe_resource(resource);
uint8_t *map;
assert(level < LP_MAX_TEXTURE_LEVELS);
assert(layer < (u_minify(resource->depth0, level) + resource->array_size - 1));
assert(tex_usage == LP_TEX_USAGE_READ ||
tex_usage == LP_TEX_USAGE_READ_WRITE ||
tex_usage == LP_TEX_USAGE_WRITE_ALL);
if (lpr->dt) {
/* display target */
struct llvmpipe_screen *screen = llvmpipe_screen(resource->screen);
struct sw_winsys *winsys = screen->winsys;
unsigned dt_usage;
if (tex_usage == LP_TEX_USAGE_READ) {
dt_usage = PIPE_TRANSFER_READ;
}
else {
dt_usage = PIPE_TRANSFER_READ_WRITE;
}
assert(level == 0);
assert(layer == 0);
/* FIXME: keep map count? */
map = winsys->displaytarget_map(winsys, lpr->dt, dt_usage);
/* install this linear image in texture data structure */
lpr->linear_img.data = map;
return map;
}
else if (llvmpipe_resource_is_texture(resource)) {
map = llvmpipe_get_texture_image(lpr, layer, level, tex_usage);
return map;
}
else {
return lpr->data;
}
}
/**
* Unmap a resource.
*/
void
llvmpipe_resource_unmap(struct pipe_resource *resource,
unsigned level,
unsigned layer)
{
struct llvmpipe_resource *lpr = llvmpipe_resource(resource);
if (lpr->dt) {
/* display target */
struct llvmpipe_screen *lp_screen = llvmpipe_screen(resource->screen);
struct sw_winsys *winsys = lp_screen->winsys;
assert(level == 0);
assert(layer == 0);
/* make sure linear image is up to date */
(void) llvmpipe_get_texture_image(lpr, layer, level,
LP_TEX_USAGE_READ,
LP_TEX_LAYOUT_LINEAR);
winsys->displaytarget_unmap(winsys, lpr->dt);
}
}
