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/**************************************************************************
*
* Copyright 2009 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#ifndef U_SIMPLE_SCREEN_H
#define U_SIMPLE_SCREEN_H
#include "pipe/p_format.h"
struct pipe_screen;
struct pipe_fence_handle;
struct pipe_surface;
struct pipe_resource;
/**
* Gallium3D drivers are (meant to be!) independent of both GL and the
* window system. The window system provides a buffer manager and a
* set of additional hooks for things like command buffer submission,
* etc.
*
* There clearly has to be some agreement between the window system
* driver and the hardware driver about the format of command buffers,
* etc.
*/
struct pipe_winsys
{
void (*destroy)( struct pipe_winsys *ws );
/** Returns name of this winsys interface */
const char *(*get_name)( struct pipe_winsys *ws );
/**
* Do any special operations to ensure frontbuffer contents are
* displayed, eg copy fake frontbuffer.
*/
void (*flush_frontbuffer)( struct pipe_winsys *ws,
struct pipe_resource *resource,
unsigned level, unsigned layer,
void *context_private );
/**
* Buffer management. Buffer attributes are mostly fixed over its lifetime.
*
* Remember that gallium gets to choose the interface it needs, and the
* window systems must then implement that interface (rather than the
* other way around...).
*
* usage is a bitmask of PIPE_BIND_*.
* All possible usages must be present.
*
* alignment indicates the client's alignment requirements, eg for
* SSE instructions.
*/
struct pipe_resource *(*buffer_create)( struct pipe_winsys *ws,
unsigned alignment,
unsigned usage,
unsigned size );
/**
* Create a buffer that wraps user-space data.
*
* Effectively this schedules a delayed call to buffer_create
* followed by an upload of the data at *some point in the future*,
* or perhaps never. Basically the allocate/upload is delayed
* until the buffer is actually passed to hardware.
*
* The intention is to provide a quick way to turn regular data
* into a buffer, and secondly to avoid a copy operation if that
* data subsequently turns out to be only accessed by the CPU.
*
* Common example is OpenGL vertex buffers that are subsequently
* processed either by software TNL in the driver or by passing to
* hardware.
*
* XXX: What happens if the delayed call to buffer_create() fails?
*
* Note that ptr may be accessed at any time upto the time when the
* buffer is destroyed, so the data must not be freed before then.
*/
struct pipe_resource *(*user_buffer_create)(struct pipe_winsys *ws,
void *ptr,
unsigned bytes);
/**
* Allocate storage for a display target surface.
*
* Often surfaces which are meant to be blitted to the front screen (i.e.,
* display targets) must be allocated with special characteristics, memory
* pools, or obtained directly from the windowing system.
*
* This callback is invoked by the pipe_screen when creating a texture marked
* with the PIPE_BIND_DISPLAY_TARGET flag to get the underlying
* buffer storage.
*/
struct pipe_resource *(*surface_buffer_create)(struct pipe_winsys *ws,
unsigned width, unsigned height,
enum pipe_format format,
unsigned usage,
unsigned tex_usage,
unsigned *stride);
/**
* Map the entire data store of a buffer object into the client's address.
* flags is bitmask of PIPE_BUFFER_USAGE_CPU_READ/WRITE flags.
*/
void *(*buffer_map)( struct pipe_winsys *ws,
struct pipe_resource *buf,
unsigned usage );
void (*buffer_unmap)( struct pipe_winsys *ws,
struct pipe_resource *buf );
void (*buffer_destroy)( struct pipe_resource *buf );
/** Set ptr = fence, with reference counting */
void (*fence_reference)( struct pipe_winsys *ws,
struct pipe_fence_handle **ptr,
struct pipe_fence_handle *fence );
/**
* Checks whether the fence has been signalled.
* \param flags driver-specific meaning
* \return zero on success.
*/
int (*fence_signalled)( struct pipe_winsys *ws,
struct pipe_fence_handle *fence,
unsigned flag );
/**
* Wait for the fence to finish.
* \param flags driver-specific meaning
* \return zero on success.
*/
int (*fence_finish)( struct pipe_winsys *ws,
struct pipe_fence_handle *fence,
unsigned flag );
};
/**
* The following function initializes a simple passthrough screen.
*
* All the relevant screen function pointers will forwarded to the
* winsys.
*/
void u_simple_screen_init(struct pipe_screen *screen);
/**
* Returns the name of the winsys associated with this screen.
*/
const char* u_simple_screen_winsys_name(struct pipe_screen *screen);
#endif
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