1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
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28 #ifndef U_SIMPLE_SCREEN_H
29 #define U_SIMPLE_SCREEN_H
31 #include "pipe/p_format.h"
34 struct pipe_fence_handle;
39 * Gallium3D drivers are (meant to be!) independent of both GL and the
40 * window system. The window system provides a buffer manager and a
41 * set of additional hooks for things like command buffer submission,
44 * There clearly has to be some agreement between the window system
45 * driver and the hardware driver about the format of command buffers,
50 void (*destroy)( struct pipe_winsys *ws );
52 /** Returns name of this winsys interface */
53 const char *(*get_name)( struct pipe_winsys *ws );
56 * Do any special operations to ensure buffer size is correct
58 void (*update_buffer)( struct pipe_winsys *ws,
59 void *context_private );
61 * Do any special operations to ensure frontbuffer contents are
62 * displayed, eg copy fake frontbuffer.
64 void (*flush_frontbuffer)( struct pipe_winsys *ws,
65 struct pipe_surface *surf,
66 void *context_private );
70 * Buffer management. Buffer attributes are mostly fixed over its lifetime.
72 * Remember that gallium gets to choose the interface it needs, and the
73 * window systems must then implement that interface (rather than the
74 * other way around...).
76 * usage is a bitmask of PIPE_BIND_*.
77 * All possible usages must be present.
79 * alignment indicates the client's alignment requirements, eg for
82 struct pipe_resource *(*buffer_create)( struct pipe_winsys *ws,
88 * Create a buffer that wraps user-space data.
90 * Effectively this schedules a delayed call to buffer_create
91 * followed by an upload of the data at *some point in the future*,
92 * or perhaps never. Basically the allocate/upload is delayed
93 * until the buffer is actually passed to hardware.
95 * The intention is to provide a quick way to turn regular data
96 * into a buffer, and secondly to avoid a copy operation if that
97 * data subsequently turns out to be only accessed by the CPU.
99 * Common example is OpenGL vertex buffers that are subsequently
100 * processed either by software TNL in the driver or by passing to
103 * XXX: What happens if the delayed call to buffer_create() fails?
105 * Note that ptr may be accessed at any time upto the time when the
106 * buffer is destroyed, so the data must not be freed before then.
108 struct pipe_resource *(*user_buffer_create)(struct pipe_winsys *ws,
113 * Allocate storage for a display target surface.
115 * Often surfaces which are meant to be blitted to the front screen (i.e.,
116 * display targets) must be allocated with special characteristics, memory
117 * pools, or obtained directly from the windowing system.
119 * This callback is invoked by the pipe_screen when creating a texture marked
120 * with the PIPE_BIND_DISPLAY_TARGET flag to get the underlying
123 struct pipe_resource *(*surface_buffer_create)(struct pipe_winsys *ws,
124 unsigned width, unsigned height,
125 enum pipe_format format,
132 * Map the entire data store of a buffer object into the client's address.
133 * flags is bitmask of PIPE_BUFFER_USAGE_CPU_READ/WRITE flags.
135 void *(*buffer_map)( struct pipe_winsys *ws,
136 struct pipe_resource *buf,
139 void (*buffer_unmap)( struct pipe_winsys *ws,
140 struct pipe_resource *buf );
142 void (*buffer_destroy)( struct pipe_resource *buf );
145 /** Set ptr = fence, with reference counting */
146 void (*fence_reference)( struct pipe_winsys *ws,
147 struct pipe_fence_handle **ptr,
148 struct pipe_fence_handle *fence );
151 * Checks whether the fence has been signalled.
152 * \param flags driver-specific meaning
153 * \return zero on success.
155 int (*fence_signalled)( struct pipe_winsys *ws,
156 struct pipe_fence_handle *fence,
160 * Wait for the fence to finish.
161 * \param flags driver-specific meaning
162 * \return zero on success.
164 int (*fence_finish)( struct pipe_winsys *ws,
165 struct pipe_fence_handle *fence,
171 * The following function initializes a simple passthrough screen.
173 * All the relevant screen function pointers will forwarded to the
176 void u_simple_screen_init(struct pipe_screen *screen);
179 * Returns the name of the winsys associated with this screen.
181 const char* u_simple_screen_winsys_name(struct pipe_screen *screen);