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+/**
+ * \file dri_util.h
+ * \brief DRI utility functions definitions.
+ *
+ * This module acts as glue between GLX and the actual hardware driver. A DRI
+ * driver doesn't really \e have to use any of this - it's optional. But, some
+ * useful stuff is done here that otherwise would have to be duplicated in most
+ * drivers.
+ *
+ * Basically, these utility functions take care of some of the dirty details of
+ * screen initialization, context creation, context binding, DRM setup, etc.
+ *
+ * These functions are compiled into each DRI driver so libGL.so knows nothing
+ * about them.
+ *
+ * Look for more comments in the dri_util.c file.
+ *
+ * \author Kevin E. Martin <kevin@precisioninsight.com>
+ * \author Brian Paul <brian@precisioninsight.com>
+ */
+
+/*
+ * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
+ * 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 PRECISION INSIGHT 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 _DRI_UTIL_H_
+#define _DRI_UTIL_H_
+
+#include <inttypes.h>
+#include "dri.h" /* public entry points */
+#include "sarea.h" /* for XF86DRISAREAPtr */
+
+#define _SOLO
+
+typedef unsigned long CARD32;
+typedef int (* PFNGLXGETUSTPROC) ( uint64_t * ust );
+
+typedef struct __DRIdisplayPrivateRec __DRIdisplayPrivate; /**< \brief Alias for __DRIdisplayPrivateRec */
+typedef struct __DRIscreenPrivateRec __DRIscreenPrivate; /**< \brief Alias for __DRIscreenPrivateRec */
+typedef struct __DRIcontextPrivateRec __DRIcontextPrivate; /**< \brief Alias for __DRIcontextPrivateRec */
+typedef struct __DRIdrawablePrivateRec __DRIdrawablePrivate; /**< \brief Alias for __DRIdrawablePrivateRec */
+typedef struct __DRIswapInfoRec __DRIswapInfo; /**< \brief Alias for __DRIswapInfoPrivateRec */
+
+
+/**
+ * Used by DRI_VALIDATE_DRAWABLE_INFO
+ */
+#define DRI_VALIDATE_DRAWABLE_INFO_ONCE(pDrawPriv) \
+ do { \
+ if (*(pDrawPriv->pStamp) != pDrawPriv->lastStamp) { \
+ __driUtilUpdateDrawableInfo(pDrawPriv); \
+ } \
+ } while (0)
+
+
+/**
+ * \brief Utility macro to validate the drawable information.
+ *
+ * See __DRIdrawablePrivateRec::pStamp and __DRIdrawablePrivateRec::lastStamp.
+ */
+#define DRI_VALIDATE_DRAWABLE_INFO(psp, pdp) \
+do { \
+ DRI_VALIDATE_DRAWABLE_INFO_ONCE(pdp); \
+} while (0)
+
+
+/**
+ * Driver callback functions.
+ *
+ * Each DRI driver must have one of these structures with all the pointers set
+ * to appropriate functions within the driver.
+ *
+ * When glXCreateContext() is called, for example, it'll call a helper function
+ * dri_util.c which in turn will jump through the \a CreateContext pointer in
+ * this structure.
+ */
+struct __DriverAPIRec {
+ /**
+ * Driver initialization callback
+ */
+ GLboolean (*InitDriver)(__DRIscreenPrivate *driScrnPriv);
+
+ /**
+ * Screen destruction callback
+ */
+ void (*DestroyScreen)(__DRIscreenPrivate *driScrnPriv);
+
+ /**
+ * Context creation callback
+ */
+ GLboolean (*CreateContext)(const __GLcontextModes *glVis,
+ __DRIcontextPrivate *driContextPriv,
+ void *sharedContextPrivate);
+
+ /**
+ * Context destruction callback
+ */
+ void (*DestroyContext)(__DRIcontextPrivate *driContextPriv);
+
+ /**
+ * Buffer (drawable) creation callback
+ */
+ GLboolean (*CreateBuffer)(__DRIscreenPrivate *driScrnPriv,
+ __DRIdrawablePrivate *driDrawPriv,
+ const __GLcontextModes *glVis,
+ GLboolean pixmapBuffer);
+
+ /**
+ * Buffer (drawable) destruction callback
+ */
+ void (*DestroyBuffer)(__DRIdrawablePrivate *driDrawPriv);
+
+ /**
+ * Buffer swapping callback
+ */
+ void (*SwapBuffers)(__DRIdrawablePrivate *driDrawPriv);
+
+ /**
+ * Context activation callback
+ */
+ GLboolean (*MakeCurrent)(__DRIcontextPrivate *driContextPriv,
+ __DRIdrawablePrivate *driDrawPriv,
+ __DRIdrawablePrivate *driReadPriv);
+
+ /**
+ * Context unbinding callback
+ */
+ GLboolean (*UnbindContext)(__DRIcontextPrivate *driContextPriv);
+
+ /**
+ * Full screen mode opening callback.
+ *
+ * \deprecated Full screen functionality is no longer used by DRI.
+ * Drivers should simply install a function returning
+ * \c GL_TRUE for backwards compatability.
+ */
+ GLboolean (*OpenFullScreen)(__DRIcontextPrivate *driContextPriv);
+
+ /**
+ * Full screen mode closing callback.
+ *
+ * \deprecated Full screen functionality is no longer used by DRI.
+ * Drivers should simply install a function returning
+ * \c GL_TRUE for backwards compatability.
+ */
+ GLboolean (*CloseFullScreen)(__DRIcontextPrivate *driContextPriv);
+
+ /* Retrieves statistics about buffer swap operations. Required if
+ * GLX_OML_sync_control or GLX_MESA_swap_frame_usage is supported.
+ */
+ int (*GetSwapInfo)( __DRIdrawablePrivate *dPriv, __DRIswapInfo * sInfo );
+
+
+ /* Required if GLX_SGI_video_sync or GLX_OML_sync_control is
+ * supported.
+ */
+ int (*GetMSC)( __DRIscreenPrivate * priv, int64_t * count );
+
+ /**
+ * These are required if GLX_OML_sync_control is supported.
+ */
+ /*@{*/
+ int (*WaitForMSC)( __DRIdrawablePrivate *priv, int64_t target_msc,
+ int64_t divisor, int64_t remainder,
+ int64_t * msc );
+ int (*WaitForSBC)( __DRIdrawablePrivate *priv, int64_t target_sbc,
+ int64_t * msc, int64_t * sbc );
+
+ int64_t (*SwapBuffersMSC)( __DRIdrawablePrivate *priv, int64_t target_msc,
+ int64_t divisor, int64_t remainder );
+ /*@}*/
+};
+
+
+struct __DRIswapInfoRec {
+ /**
+ * Number of swapBuffers operations that have been *completed*.
+ */
+ uint64_t swap_count;
+
+ /*
+ * Unadjusted system time of the last buffer swap. This is the time
+ * when the swap completed, not the time when swapBuffers was called.
+ */
+ int64_t swap_ust;
+
+ /*
+ * Number of swap operations that occurred after the swap deadline. That
+ * is if a swap happens more than swap_interval frames after the previous
+ * swap, it has missed its deadline. If swap_interval is 0, then the
+ * swap deadline is 1 frame after the previous swap.
+ */
+ uint64_t swap_missed_count;
+
+ /*
+ * Amount of time used by the last swap that missed its deadline. This
+ * is calculated as (__glXGetUST() - swap_ust) / (swap_interval *
+ * time_for_single_vrefresh)). If the actual value of swap_interval is
+ * 0, then 1 is used instead. If swap_missed_count is non-zero, this
+ * should be greater-than 1.0.
+ */
+ float swap_missed_usage;
+};
+
+
+/**
+ * \brief Per-drawable private DRI driver information.
+ *
+ */
+struct __DRIdrawablePrivateRec {
+
+ /**
+ * \brief Public entry points
+ */
+ __DRIdrawable entry;
+
+ /**
+ * \brief Kernel drawable handle
+ *
+ * \note Not currently used.
+ */
+ drmDrawable hHWDrawable;
+
+ /**
+ * \brief Driver's private drawable information.
+ *
+ * This structure is opaque.
+ */
+ void *driverPrivate;
+
+ /**
+ * \brief Reference count for number of context's currently bound to this
+ * drawable.
+ *
+ * Once it reaches zero, the drawable can be destroyed.
+ *
+ * \note This behavior will change with GLX 1.3.
+ */
+ int refcount;
+
+ /**
+ * \brief Index of this drawable information in the SAREA.
+ */
+ unsigned int index;
+
+ /**
+ * \brief Pointer to the "drawable has changed ID" stamp in the SAREA.
+ */
+ unsigned int *pStamp;
+
+ /**
+ * \brief Last value of the stamp.
+ *
+ * If this differs from the value stored at
+ * __DRIdrawablePrivateRec::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;
+ XF86DRIClipRectPtr pClipRects;
+ /*@}*/
+
+ /**
+ * \name Back and depthbuffer
+ * Information about the back and depthbuffer where different from above.
+ */
+ /*@{*/
+ int backX;
+ int backY;
+ int backClipRectType;
+ int numBackClipRects;
+ XF86DRIClipRectPtr pBackClipRects;
+ /*@}*/
+
+ /**
+ * \brief Pointer to context to which this drawable is currently bound.
+ */
+ __DRIcontextPrivate *driContextPriv;
+
+ /**
+ * \brief Pointer to screen on which this drawable was created.
+ */
+ __DRIscreenPrivate *driScreenPriv;
+
+ int cpp;
+ void *frontBuffer;
+ void *backBuffer;
+ void *currentBuffer;
+ int currentPitch;
+
+ int depthCpp;
+ void *depthBuffer;
+ int depthPitch;
+
+ /**
+ * \brief Called via glXSwapBuffers().
+ */
+ void (*swapBuffers)( __DRIdrawablePrivate *dPriv );
+};
+
+/**
+ * \brief Per-context private driver information.
+ */
+struct __DRIcontextPrivateRec {
+ /**
+ * \brief Public entry points
+ */
+ __DRIcontext entry;
+
+ /**
+ * \brief Kernel context handle used to access the device lock.
+ */
+ drmContext hHWContext;
+
+ /**
+ * \brief Device driver's private context data. This structure is opaque.
+ */
+ void *driverPrivate;
+
+ /**
+ * \brief Pointer to drawable currently bound to this context.
+ */
+ __DRIdrawablePrivate *driDrawablePriv;
+
+ /**
+ * \brief Pointer to screen on which this context was created.
+ */
+ __DRIscreenPrivate *driScreenPriv;
+};
+
+/**
+ * \brief Per-screen private driver information.
+ */
+struct __DRIscreenPrivateRec {
+
+ /**
+ * \brief Public entry points
+ */
+ __DRIscreen entry;
+
+ /**
+ * \brief Callback functions into the hardware-specific DRI driver code.
+ */
+ struct __DriverAPIRec DriverAPI;
+
+ /**
+ * \name DDX version
+ * DDX / 2D driver version information.
+ */
+ /*@{*/
+ int ddxMajor;
+ int ddxMinor;
+ int ddxPatch;
+ /*@}*/
+
+ /**
+ * \name DRI version
+ * DRI X extension version information.
+ */
+ /*@{*/
+ int driMajor;
+ int driMinor;
+ int driPatch;
+ /*@}*/
+
+ /**
+ * \name DRM version
+ * DRM (kernel module) version information.
+ */
+ /*@{*/
+ int drmMajor;
+ int drmMinor;
+ int drmPatch;
+ /*@}*/
+
+ /**
+ * \brief 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;
+
+ /**
+ * \brief 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;
+
+ /**
+ * \brief SAREA pointer
+ *
+ * Used to access:
+ * - the device lock
+ * - the device-independent per-drawable and per-context(?) information
+ */
+ XF86DRISAREAPtr 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;
+ /*@}*/
+
+ /**
+ * \brief 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.
+ */
+ __DRIcontextPrivate dummyContextPriv;
+
+ /**
+ * \brief Hash table to hold the drawable information for this screen.
+ */
+ void *drawHash;
+
+ /**
+ * \brief Device-dependent private information (not stored in the SAREA).
+ *
+ * This pointer is never touched by the DRI layer.
+ */
+ void *private;
+
+ /**
+ * \brief Full screen mode.
+ *
+ * If we're in full screen mode (via DRIOpenFullScreen()), this points to
+ * the drawable that was bound. Otherwise, this is NULL.
+ */
+ __DRIdrawablePrivate *fullscreen;
+};
+
+extern void
+__driUtilMessage(const char *f, ...);
+
+
+extern void
+__driUtilUpdateDrawableInfo(__DRIdrawablePrivate *pdp);
+
+
+extern __DRIscreenPrivate *
+__driUtilCreateScreen(struct DRIDriverRec *driver,
+ struct DRIDriverContextRec *driverContext,
+ const struct __DriverAPIRec *driverAPI);
+
+__DRIscreenPrivate *
+__driUtilCreateScreenNoDRM(struct DRIDriverRec *driver,
+ struct DRIDriverContextRec *driverContext,
+ const struct __DriverAPIRec *driverAPI);
+
+extern float
+driCalculateSwapUsage( __DRIdrawablePrivate *dPriv,
+ int64_t last_swap_ust, int64_t current_ust );
+
+/* Test the version of the internal GLX API. Returns a value like strcmp. */
+extern int
+driCompareGLXAPIVersion( GLuint required_version );
+
+/** This is optionally implemented in each driver */
+extern void
+__driRegisterExtensions( void );
+
+#endif /* _DRI_UTIL_H_ */