dri_util.h

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

     *
     * \note This behavior will change with GLX 1.3.
     */
    int refcount;

    /**
     * Index of this drawable information in the SAREA.
     */
    unsigned int index;

    /**
     * Pointer to the "drawable has changed ID" stamp in the SAREA.
     */
    unsigned int *pStamp;

    /**
     * Last value of the stamp.
     *
     * If this differs from the value stored at __DRIdrawable::pStamp,
     * then the drawable information has been modified by the X server, and the
     * drawable information (below) should be retrieved from the X server.
     */
    unsigned int lastStamp;

    /**
     * \name Drawable 
     *
     * Drawable information used in software fallbacks.
     */
    /*@{*/
    int x;
    int y;
    int w;
    int h;
    int numClipRects;
    drm_clip_rect_t *pClipRects;
    /*@}*/

    /**
     * \name Back and depthbuffer
     *
     * Information about the back and depthbuffer where different from above.
     */
    /*@{*/
    int backX;
    int backY;
    int backClipRectType;
    int numBackClipRects;
    drm_clip_rect_t *pBackClipRects;
    /*@}*/

    /**
     * \name Vertical blank tracking information
     * Used for waiting on vertical blank events.
     */
    /*@{*/
    unsigned int vblSeq;
    unsigned int vblFlags;
    /*@}*/

    /**
     * \name Monotonic MSC tracking
     *
     * Low level driver is responsible for updating msc_base and
     * vblSeq values so that higher level code can calculate
     * a new msc value or msc target for a WaitMSC call.  The new value
     * will be:
     *   msc = msc_base + get_vblank_count() - vblank_base;
     *
     * And for waiting on a value, core code will use:
     *   actual_target = target_msc - msc_base + vblank_base;
     */
    /*@{*/
    int64_t vblank_base;
    int64_t msc_base;
    /*@}*/

    /**
     * Pointer to context to which this drawable is currently bound.
     */
    __DRIcontext *driContextPriv;

    /**
     * Pointer to screen on which this drawable was created.
     */
    __DRIscreen *driScreenPriv;

    /**
     * Controls swap interval as used by GLX_SGI_swap_control and
     * GLX_MESA_swap_control.
     */
    unsigned int swap_interval;
    struct {
	unsigned int tail;
	unsigned int drawable_id;
    } dri2;
};

/**
 * Per-context private driver information.
 */
struct __DRIcontextRec {
    /**
     * Kernel context handle used to access the device lock.
     */
    drm_context_t hHWContext;

    /**
     * Device driver's private context data.  This structure is opaque.
     */
    void *driverPrivate;

    /**
     * Pointer back to the \c __DRIcontext that contains this structure.
     */
    __DRIcontext *pctx;

    /**
     * Pointer to drawable currently bound to this context for drawing.
     */
    __DRIdrawable *driDrawablePriv;

    /**
     * Pointer to drawable currently bound to this context for reading.
     */
    __DRIdrawable *driReadablePriv;

    /**
     * Pointer to screen on which this context was created.
     */
    __DRIscreen *driScreenPriv;
};

/**
 * Per-screen private driver information.
 */
struct __DRIscreenRec {
    /**
     * Current screen's number
     */
    int myNum;

    /**
     * Callback functions into the hardware-specific DRI driver code.
     */
    struct __DriverAPIRec DriverAPI;

    const __DRIextension **extensions;
    /**
     * DDX / 2D driver version information.
     */
    __DRIversion ddx_version;

    /**
     * DRI X extension version information.
     */
    __DRIversion dri_version;

    /**
     * DRM (kernel module) version information.
     */
    __DRIversion drm_version;

    /**
     * ID used when the client sets the drawable lock.
     *
     * The X server uses this value to detect if the client has died while
     * holding the drawable lock.
     */
    int drawLockID;

    /**
     * File descriptor returned when the kernel device driver is opened.
     * 
     * Used to:
     *   - authenticate client to kernel
     *   - map the frame buffer, SAREA, etc.
     *   - close the kernel device driver
     */
    int fd;

    /**
     * SAREA pointer 
     *
     * Used to access:
     *   - the device lock
     *   - the device-independent per-drawable and per-context(?) information
     */
    drm_sarea_t *pSAREA;

    /**
     * \name Direct frame buffer access information 
     * Used for software fallbacks.
     */
    /*@{*/
    unsigned char *pFB;
    int fbSize;
    int fbOrigin;
    int fbStride;
    int fbWidth;
    int fbHeight;
    int fbBPP;
    /*@}*/

    /**
     * \name Device-dependent private information (stored in the SAREA).
     *
     * This data is accessed by the client driver only.
     */
    /*@{*/
    void *pDevPriv;
    int devPrivSize;
    /*@}*/

    /**
     * Dummy context to which drawables are bound when not bound to any
     * other context. 
     *
     * A dummy hHWContext is created for this context, and is used by the GL
     * core when a hardware lock is required but the drawable is not currently
     * bound (e.g., potentially during a SwapBuffers request).  The dummy
     * context is created when the first "real" context is created on this
     * screen.
     */
    __DRIcontext dummyContextPriv;

    /**
     * Device-dependent private information (not stored in the SAREA).
     * 
     * This pointer is never touched by the DRI layer.
     */
    void *private;

    /**
     * Pointer back to the \c __DRIscreen that contains this structure.
     */
    __DRIscreen *psc;

    /* Extensions provided by the loader. */
    const __DRIgetDrawableInfoExtension *getDrawableInfo;
    const __DRIsystemTimeExtension *systemTime;
    const __DRIdamageExtension *damage;

    struct {
	/* Flag to indicate that this is a DRI2 screen.  Many of the above
	 * fields will not be valid or initializaed in that case. */
	int enabled;
#ifdef TTM_API
	drmBO sareaBO;
#endif
	void *sarea;
	__DRIEventBuffer *buffer;
	__DRILock *lock;
	__DRIloaderExtension *loader;
    } dri2;

    /* The lock actually in use, old sarea or DRI2 */
    drmLock *lock;
};

extern void
__driUtilMessage(const char *f, ...);


extern void
__driUtilUpdateDrawableInfo(__DRIdrawable *pdp);

extern int
__driParseEvents(__DRIcontext *psp, __DRIdrawable *pdp);

extern float
driCalculateSwapUsage( __DRIdrawable *dPriv,
		       int64_t last_swap_ust, int64_t current_ust );

extern GLint
driIntersectArea( drm_clip_rect_t rect1, drm_clip_rect_t rect2 );

#endif /* _DRI_UTIL_H_ */