src/gallium/auxiliary/util/u_simple_screen.h

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   3  * Copyright 2009 VMware, Inc.
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  16  * of the Software.
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  27
  28 #ifndef U_SIMPLE_SCREEN_H
  29 #define U_SIMPLE_SCREEN_H
  30
  31 #include "pipe/p_format.h"
  32
  33 struct pipe_screen;
  34 struct pipe_fence_handle;
  35 struct pipe_surface;
  36 struct pipe_resource;
  37
  38 /**
  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,
  42  * etc.
  43  *
  44  * There clearly has to be some agreement between the window system
  45  * driver and the hardware driver about the format of command buffers,
  46  * etc.
  47  */
  48 struct pipe_winsys
  49 {
  50    void (*destroy)( struct pipe_winsys *ws );
  51
  52    /** Returns name of this winsys interface */
  53    const char *(*get_name)( struct pipe_winsys *ws );
  54
  55    /**
  56     * Do any special operations to ensure buffer size is correct
  57     */
  58    void (*update_buffer)( struct pipe_winsys *ws,
  59                           void *context_private );
  60    /**
  61     * Do any special operations to ensure frontbuffer contents are
  62     * displayed, eg copy fake frontbuffer.
  63     */
  64    void (*flush_frontbuffer)( struct pipe_winsys *ws,
  65                               struct pipe_surface *surf,
  66                               void *context_private );
  67
  68
  69    /**
  70     * Buffer management. Buffer attributes are mostly fixed over its lifetime.
  71     *
  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...).
  75     *
  76     * usage is a bitmask of PIPE_BIND_*.
  77     * All possible usages must be present.
  78     *
  79     * alignment indicates the client's alignment requirements, eg for
  80     * SSE instructions.
  81     */
  82    struct pipe_resource *(*buffer_create)( struct pipe_winsys *ws,
  83                                          unsigned alignment,
  84                                          unsigned usage,
  85                                          unsigned size );
  86
  87    /**
  88     * Create a buffer that wraps user-space data.
  89     *
  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.
  94     *
  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.
  98     *
  99     * Common example is OpenGL vertex buffers that are subsequently
 100     * processed either by software TNL in the driver or by passing to
 101     * hardware.
 102     *
 103     * XXX: What happens if the delayed call to buffer_create() fails?
 104     *
 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.
 107     */
 108    struct pipe_resource *(*user_buffer_create)(struct pipe_winsys *ws,
 109                                                     void *ptr,
 110                                                     unsigned bytes);
 111
 112    /**
 113     * Allocate storage for a display target surface.
 114     *
 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.
 118     *
 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
 121     * buffer storage.
 122     */
 123    struct pipe_resource *(*surface_buffer_create)(struct pipe_winsys *ws,
 124                                                 unsigned width, unsigned height,
 125                                                 enum pipe_format format,
 126                                                 unsigned usage,
 127                                                 unsigned tex_usage,
 128                                                 unsigned *stride);
 129
 130
 131    /**
 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.
 134     */
 135    void *(*buffer_map)( struct pipe_winsys *ws,
 136                         struct pipe_resource *buf,
 137                         unsigned usage );
 138
 139    void (*buffer_unmap)( struct pipe_winsys *ws,
 140                          struct pipe_resource *buf );
 141
 142    void (*buffer_destroy)( struct pipe_resource *buf );
 143
 144
 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 );
 149
 150    /**
 151     * Checks whether the fence has been signalled.
 152     * \param flags  driver-specific meaning
 153     * \return zero on success.
 154     */
 155    int (*fence_signalled)( struct pipe_winsys *ws,
 156                            struct pipe_fence_handle *fence,
 157                            unsigned flag );
 158
 159    /**
 160     * Wait for the fence to finish.
 161     * \param flags  driver-specific meaning
 162     * \return zero on success.
 163     */
 164    int (*fence_finish)( struct pipe_winsys *ws,
 165                         struct pipe_fence_handle *fence,
 166                         unsigned flag );
 167
 168 };
 169
 170 /**
 171  * The following function initializes a simple passthrough screen.
 172  *
 173  * All the relevant screen function pointers will forwarded to the
 174  * winsys.
 175  */
 176 void u_simple_screen_init(struct pipe_screen *screen);
 177
 178 /**
 179  * Returns the name of the winsys associated with this screen.
 180  */
 181 const char* u_simple_screen_winsys_name(struct pipe_screen *screen);
 182
 183 #endif