static void *
softpipe_transfer_map( struct pipe_screen *screen,
struct pipe_transfer *transfer )
{
ubyte *map, *xfer_map;
struct softpipe_texture *spt;
unsigned flags = 0;
assert(transfer->texture);
spt = softpipe_texture(transfer->texture);
if (transfer->usage != PIPE_TRANSFER_READ) {
flags |= PIPE_BUFFER_USAGE_CPU_WRITE;
}
if (transfer->usage != PIPE_TRANSFER_WRITE) {
flags |= PIPE_BUFFER_USAGE_CPU_READ;
}
map = pipe_buffer_map(screen, spt->buffer, flags);
if (map == NULL)
return NULL;
/* May want to different things here depending on read/write nature
* of the map:
*/
if (transfer->texture && transfer->usage != PIPE_TRANSFER_READ)
{
/* Do something to notify sharing contexts of a texture change.
* In softpipe, that would mean flushing the texture cache.
*/
softpipe_screen(screen)->timestamp++;
}
xfer_map = map + softpipe_transfer(transfer)->offset +
transfer->y / transfer->block.height * transfer->stride +
transfer->x / transfer->block.width * transfer->block.size;
/*printf("map = %p xfer map = %p\n", map, xfer_map);*/
return xfer_map;
}
/**
* Create memory mapping for given pipe_transfer object.
*/
static void *
softpipe_transfer_map(struct pipe_context *pipe,
struct pipe_transfer *transfer)
{
struct softpipe_transfer *spt = softpipe_transfer(transfer);
struct softpipe_resource *spr = softpipe_resource(transfer->resource);
struct sw_winsys *winsys = softpipe_screen(pipe->screen)->winsys;
uint8_t *map;
/* resources backed by display target treated specially:
*/
if (spr->dt) {
map = winsys->displaytarget_map(winsys, spr->dt, transfer->usage);
}
else {
map = spr->data;
}
if (map == NULL)
return NULL;
else
return map + spt->offset;
}
