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/* Direct3D 10/11 has no concept of transfers. Applications instead
* create resources with a STAGING or DYNAMIC usage, copy between them
* and the real resource and use Map to map the STAGING/DYNAMIC resource.
*
* This util module allows to implement Gallium drivers as a Direct3D
* driver would be implemented: transfers allocate a resource with
* PIPE_USAGE_STAGING, and copy the data between it and the real resource
* with resource_copy_region.
*/
#ifndef U_STAGING_H
#define U_STAGING_H
#include "pipe/p_state.h"
struct util_staging_transfer {
struct pipe_transfer base;
/* if direct, same as base.resource, otherwise the temporary staging resource */
struct pipe_resource *staging_resource;
};
/* user must be stride, slice_stride and offset */
/* pt->usage == PIPE_USAGE_DYNAMIC || pt->usage == PIPE_USAGE_STAGING should be a good value to pass for direct */
/* staging resource is currently created with PIPE_USAGE_STAGING */
struct util_staging_transfer *
util_staging_transfer_init(struct pipe_context *pipe,
struct pipe_resource *pt,
struct pipe_subresource sr,
unsigned usage,
const struct pipe_box *box,
bool direct, struct util_staging_transfer *tx);
void
util_staging_transfer_destroy(struct pipe_context *pipe, struct pipe_transfer *ptx);
#endif
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