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_buffer;
  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_BUFFER_USAGE_PIXEL/VERTEX/INDEX/CONSTANT. This
  77     * usage argument is only an optimization hint, not a guarantee, therefore
  78     * proper behavior must be observed in all circumstances.
  79     *
  80     * alignment indicates the client's alignment requirements, eg for
  81     * SSE instructions.
  82     */
  83    struct pipe_buffer *(*buffer_create)( struct pipe_winsys *ws,
  84                                          unsigned alignment,
  85                                          unsigned usage,
  86                                          unsigned size );
  87
  88    /**
  89     * Create a buffer that wraps user-space data.
  90     *
  91     * Effectively this schedules a delayed call to buffer_create
  92     * followed by an upload of the data at *some point in the future*,
  93     * or perhaps never.  Basically the allocate/upload is delayed
  94     * until the buffer is actually passed to hardware.
  95     *
  96     * The intention is to provide a quick way to turn regular data
  97     * into a buffer, and secondly to avoid a copy operation if that
  98     * data subsequently turns out to be only accessed by the CPU.
  99     *
 100     * Common example is OpenGL vertex buffers that are subsequently
 101     * processed either by software TNL in the driver or by passing to
 102     * hardware.
 103     *
 104     * XXX: What happens if the delayed call to buffer_create() fails?
 105     *
 106     * Note that ptr may be accessed at any time upto the time when the
 107     * buffer is destroyed, so the data must not be freed before then.
 108     */
 109    struct pipe_buffer *(*user_buffer_create)(struct pipe_winsys *ws,
 110                                                     void *ptr,
 111                                                     unsigned bytes);
 112
 113    /**
 114     * Allocate storage for a display target surface.
 115     *
 116     * Often surfaces which are meant to be blitted to the front screen (i.e.,
 117     * display targets) must be allocated with special characteristics, memory
 118     * pools, or obtained directly from the windowing system.
 119     *
 120     * This callback is invoked by the pipe_screenwhen creating a texture marked
 121     * with the PIPE_TEXTURE_USAGE_DISPLAY_TARGET flag  to get the underlying
 122     * buffer storage.
 123     */
 124    struct pipe_buffer *(*surface_buffer_create)(struct pipe_winsys *ws,
 125                                                 unsigned width, unsigned height,
 126                                                 enum pipe_format format,
 127                                                 unsigned usage,
 128                                                 unsigned tex_usage,
 129                                                 unsigned *stride);
 130
 131
 132    /**
 133     * Map the entire data store of a buffer object into the client's address.
 134     * flags is bitmask of PIPE_BUFFER_USAGE_CPU_READ/WRITE flags.
 135     */
 136    void *(*buffer_map)( struct pipe_winsys *ws,
 137                         struct pipe_buffer *buf,
 138                         unsigned usage );
 139
 140    void (*buffer_unmap)( struct pipe_winsys *ws,
 141                          struct pipe_buffer *buf );
 142
 143    void (*buffer_destroy)( struct pipe_buffer *buf );
 144
 145
 146    /** Set ptr = fence, with reference counting */
 147    void (*fence_reference)( struct pipe_winsys *ws,
 148                             struct pipe_fence_handle **ptr,
 149                             struct pipe_fence_handle *fence );
 150
 151    /**
 152     * Checks whether the fence has been signalled.
 153     * \param flags  driver-specific meaning
 154     * \return zero on success.
 155     */
 156    int (*fence_signalled)( struct pipe_winsys *ws,
 157                            struct pipe_fence_handle *fence,
 158                            unsigned flag );
 159
 160    /**
 161     * Wait for the fence to finish.
 162     * \param flags  driver-specific meaning
 163     * \return zero on success.
 164     */
 165    int (*fence_finish)( struct pipe_winsys *ws,
 166                         struct pipe_fence_handle *fence,
 167                         unsigned flag );
 168
 169 };
 170
 171 /**
 172  * The following function initializes a simple passthrough screen.
 173  *
 174  * All the relevant screen function pointers will forwarded to the
 175  * winsys.
 176  */
 177 void u_simple_screen_init(struct pipe_screen *screen);
 178
 179 /**
 180  * Returns the name of the winsys associated with this screen.
 181  */
 182 const char* u_simple_screen_winsys_name(struct pipe_screen *screen);
 183
 184 #endif