[mesa.git] / include / GL / internal / dri_interface.h

/*
 * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2007-2008 Red Hat, Inc.
 * (C) Copyright IBM Corporation 2004
 * 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
 * on 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
 * THE COPYRIGHT HOLDERS AND/OR THEIR 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.
 */

/**
 * \file dri_interface.h
 *
 * This file contains all the types and functions that define the interface
 * between a DRI driver and driver loader.  Currently, the most common driver
 * loader is the XFree86 libGL.so.  However, other loaders do exist, and in
 * the future the server-side libglx.a will also be a loader.
 * 
 * \author Kevin E. Martin <kevin@precisioninsight.com>
 * \author Ian Romanick <idr@us.ibm.com>
 * \author Kristian Høgsberg <krh@redhat.com>
 */

#ifndef DRI_INTERFACE_H
#define DRI_INTERFACE_H

/* For archs with no drm.h */
#if !defined(__APPLE__) && !defined(__CYGWIN__) && !defined(__GNU__)
#include <drm.h>
#else
typedef unsigned int drm_context_t;
typedef unsigned int drm_drawable_t;
typedef struct drm_clip_rect drm_clip_rect_t;
#endif

/**
 * \name DRI interface structures
 *
 * The following structures define the interface between the GLX client
 * side library and the DRI (direct rendering infrastructure).
 */
/*@{*/
typedef struct __DRIdisplayRec          __DRIdisplay;
typedef struct __DRIscreenRec           __DRIscreen;
typedef struct __DRIcontextRec          __DRIcontext;
typedef struct __DRIdrawableRec         __DRIdrawable;
typedef struct __DRIconfigRec           __DRIconfig;
typedef struct __DRIframebufferRec      __DRIframebuffer;
typedef struct __DRIversionRec          __DRIversion;

typedef struct __DRIcoreExtensionRec            __DRIcoreExtension;
typedef struct __DRIextensionRec                __DRIextension;
typedef struct __DRIcopySubBufferExtensionRec   __DRIcopySubBufferExtension;
typedef struct __DRIswapControlExtensionRec     __DRIswapControlExtension;
typedef struct __DRIallocateExtensionRec        __DRIallocateExtension;
typedef struct __DRIframeTrackingExtensionRec   __DRIframeTrackingExtension;
typedef struct __DRImediaStreamCounterExtensionRec      __DRImediaStreamCounterExtension;
typedef struct __DRItexOffsetExtensionRec       __DRItexOffsetExtension;
typedef struct __DRItexBufferExtensionRec       __DRItexBufferExtension;
typedef struct __DRIlegacyExtensionRec          __DRIlegacyExtension;
typedef struct __DRIswrastExtensionRec          __DRIswrastExtension;
typedef struct __DRIbufferRec                   __DRIbuffer;
typedef struct __DRIdri2ExtensionRec            __DRIdri2Extension;
typedef struct __DRIdri2LoaderExtensionRec      __DRIdri2LoaderExtension;
typedef struct __DRI2flushExtensionRec  __DRI2flushExtension;

/*@}*/


/**
 * Extension struct.  Drivers 'inherit' from this struct by embedding
 * it as the first element in the extension struct.
 *
 * We never break API in for a DRI extension.  If we need to change
 * the way things work in a non-backwards compatible manner, we
 * introduce a new extension.  During a transition period, we can
 * leave both the old and the new extension in the driver, which
 * allows us to move to the new interface without having to update the
 * loader(s) in lock step.
 *
 * However, we can add entry points to an extension over time as long
 * as we don't break the old ones.  As we add entry points to an
 * extension, we increase the version number.  The corresponding
 * #define can be used to guard code that accesses the new entry
 * points at compile time and the version field in the extension
 * struct can be used at run-time to determine how to use the
 * extension.
 */
struct __DRIextensionRec {
    const char *name;
    int version;
};

/**
 * The first set of extension are the screen extensions, returned by
 * __DRIcore::getExtensions().  This entry point will return a list of
 * extensions and the loader can use the ones it knows about by
 * casting them to more specific extensions and advertising any GLX
 * extensions the DRI extensions enables.
 */

/**
 * Used by drivers to indicate support for setting the read drawable.
 */
#define __DRI_READ_DRAWABLE "DRI_ReadDrawable"
#define __DRI_READ_DRAWABLE_VERSION 1

/**
 * Used by drivers that implement the GLX_MESA_copy_sub_buffer extension.
 */
#define __DRI_COPY_SUB_BUFFER "DRI_CopySubBuffer"
#define __DRI_COPY_SUB_BUFFER_VERSION 1
struct __DRIcopySubBufferExtensionRec {
    __DRIextension base;
    void (*copySubBuffer)(__DRIdrawable *drawable, int x, int y, int w, int h);
};

/**
 * Used by drivers that implement the GLX_SGI_swap_control or
 * GLX_MESA_swap_control extension.
 */
#define __DRI_SWAP_CONTROL "DRI_SwapControl"
#define __DRI_SWAP_CONTROL_VERSION 1
struct __DRIswapControlExtensionRec {
    __DRIextension base;
    void (*setSwapInterval)(__DRIdrawable *drawable, unsigned int inteval);
    unsigned int (*getSwapInterval)(__DRIdrawable *drawable);
};

/**
 * Used by drivers that implement the GLX_MESA_allocate_memory.
 */
#define __DRI_ALLOCATE "DRI_Allocate"
#define __DRI_ALLOCATE_VERSION 1
struct __DRIallocateExtensionRec {
    __DRIextension base;

    void *(*allocateMemory)(__DRIscreen *screen, GLsizei size,
                            GLfloat readfreq, GLfloat writefreq,
                            GLfloat priority);
   
    void (*freeMemory)(__DRIscreen *screen, GLvoid *pointer);
   
    GLuint (*memoryOffset)(__DRIscreen *screen, const GLvoid *pointer);
};

/**
 * Used by drivers that implement the GLX_MESA_swap_frame_usage extension.
 */
#define __DRI_FRAME_TRACKING "DRI_FrameTracking"
#define __DRI_FRAME_TRACKING_VERSION 1
struct __DRIframeTrackingExtensionRec {
    __DRIextension base;

    /**
     * Enable or disable frame usage tracking.
     * 
     * \since Internal API version 20030317.
     */
    int (*frameTracking)(__DRIdrawable *drawable, GLboolean enable);

    /**
     * Retrieve frame usage information.
     * 
     * \since Internal API version 20030317.
     */
    int (*queryFrameTracking)(__DRIdrawable *drawable,
                              int64_t * sbc, int64_t * missedFrames,
                              float * lastMissedUsage, float * usage);
};


/**
 * Used by drivers that implement the GLX_SGI_video_sync extension.
 */
#define __DRI_MEDIA_STREAM_COUNTER "DRI_MediaStreamCounter"
#define __DRI_MEDIA_STREAM_COUNTER_VERSION 1
struct __DRImediaStreamCounterExtensionRec {
    __DRIextension base;

    /**
     * Wait for the MSC to equal target_msc, or, if that has already passed,
     * the next time (MSC % divisor) is equal to remainder.  If divisor is
     * zero, the function will return as soon as MSC is greater than or equal
     * to target_msc.
     */
    int (*waitForMSC)(__DRIdrawable *drawable,
                      int64_t target_msc, int64_t divisor, int64_t remainder,
                      int64_t * msc, int64_t * sbc);

    /**
     * Get the number of vertical refreshes since some point in time before
     * this function was first called (i.e., system start up).
     */
    int (*getDrawableMSC)(__DRIscreen *screen, __DRIdrawable *drawable,
                          int64_t *msc);
};


#define __DRI_TEX_OFFSET "DRI_TexOffset"
#define __DRI_TEX_OFFSET_VERSION 1
struct __DRItexOffsetExtensionRec {
    __DRIextension base;

    /**
     * Method to override base texture image with a driver specific 'offset'.
     * The depth passed in allows e.g. to ignore the alpha channel of texture
     * images where the non-alpha components don't occupy a whole texel.
     *
     * For GLX_EXT_texture_from_pixmap with AIGLX.
     */
    void (*setTexOffset)(__DRIcontext *pDRICtx, GLint texname,
                         unsigned long long offset, GLint depth, GLuint pitch);
};


/* Valid values for format in the setTexBuffer2 function below.  These
 * values match the GLX tokens for compatibility reasons, but we
 * define them here since the DRI interface can't depend on GLX. */
#define __DRI_TEXTURE_FORMAT_NONE        0x20D8
#define __DRI_TEXTURE_FORMAT_RGB         0x20D9
#define __DRI_TEXTURE_FORMAT_RGBA        0x20DA

#define __DRI_TEX_BUFFER "DRI_TexBuffer"
#define __DRI_TEX_BUFFER_VERSION 2
struct __DRItexBufferExtensionRec {
    __DRIextension base;

    /**
     * Method to override base texture image with the contents of a
     * __DRIdrawable. 
     *
     * For GLX_EXT_texture_from_pixmap with AIGLX.  Deprecated in favor of
     * setTexBuffer2 in version 2 of this interface
     */
    void (*setTexBuffer)(__DRIcontext *pDRICtx,
                         GLint target,
                         __DRIdrawable *pDraw);

    /**
     * Method to override base texture image with the contents of a
     * __DRIdrawable, including the required texture format attribute.
     *
     * For GLX_EXT_texture_from_pixmap with AIGLX.
     */
    void (*setTexBuffer2)(__DRIcontext *pDRICtx,
                          GLint target,
                          GLint format,
                          __DRIdrawable *pDraw);
};

/**
 * Used by drivers that implement DRI2
 */
#define __DRI2_FLUSH "DRI2_Flush"
#define __DRI2_FLUSH_VERSION 2
struct __DRI2flushExtensionRec {
    __DRIextension base;
    void (*flush)(__DRIdrawable *drawable);

    /**
     * Flush all rendering queue in the driver to the drm and
     * invalidate all buffers.  The driver will call out to
     * getBuffers/getBuffersWithFormat before it starts rendering
     * again.
     *
     * \param drawable the drawable to flush and invalidate
     *
     * \since 2
     */
    void (*flushInvalidate)(__DRIdrawable *drawable);
};


/**
 * XML document describing the configuration options supported by the
 * driver.
 */
extern const char __driConfigOptions[];

/*@}*/

/**
 * The following extensions describe loader features that the DRI
 * driver can make use of.  Some of these are mandatory, such as the
 * getDrawableInfo extension for DRI and the DRI Loader extensions for
 * DRI2, while others are optional, and if present allow the driver to
 * expose certain features.  The loader pass in a NULL terminated
 * array of these extensions to the driver in the createNewScreen
 * constructor.
 */

typedef struct __DRIgetDrawableInfoExtensionRec __DRIgetDrawableInfoExtension;
typedef struct __DRIsystemTimeExtensionRec __DRIsystemTimeExtension;
typedef struct __DRIdamageExtensionRec __DRIdamageExtension;
typedef struct __DRIloaderExtensionRec __DRIloaderExtension;
typedef struct __DRIswrastLoaderExtensionRec __DRIswrastLoaderExtension;


/**
 * Callback to getDrawableInfo protocol
 */
#define __DRI_GET_DRAWABLE_INFO "DRI_GetDrawableInfo"
#define __DRI_GET_DRAWABLE_INFO_VERSION 1
struct __DRIgetDrawableInfoExtensionRec {
    __DRIextension base;

    /**
     * This function is used to get information about the position, size, and
     * clip rects of a drawable.
     */
    GLboolean (* getDrawableInfo) ( __DRIdrawable *drawable,
        unsigned int * index, unsigned int * stamp,
        int * x, int * y, int * width, int * height,
        int * numClipRects, drm_clip_rect_t ** pClipRects,
        int * backX, int * backY,
        int * numBackClipRects, drm_clip_rect_t ** pBackClipRects,
        void *loaderPrivate);
};

/**
 * Callback to get system time for media stream counter extensions.
 */
#define __DRI_SYSTEM_TIME "DRI_SystemTime"
#define __DRI_SYSTEM_TIME_VERSION 1
struct __DRIsystemTimeExtensionRec {
    __DRIextension base;

    /**
     * Get the 64-bit unadjusted system time (UST).
     */
    int (*getUST)(int64_t * ust);

    /**
     * Get the media stream counter (MSC) rate.
     * 
     * Matching the definition in GLX_OML_sync_control, this function returns
     * the rate of the "media stream counter".  In practical terms, this is
     * the frame refresh rate of the display.
     */
    GLboolean (*getMSCRate)(__DRIdrawable *draw,
                            int32_t * numerator, int32_t * denominator,
                            void *loaderPrivate);
};

/**
 * Damage reporting
 */
#define __DRI_DAMAGE "DRI_Damage"
#define __DRI_DAMAGE_VERSION 1
struct __DRIdamageExtensionRec {
    __DRIextension base;

    /**
     * Reports areas of the given drawable which have been modified by the
     * driver.
     *
     * \param drawable which the drawing was done to.
     * \param rects rectangles affected, with the drawable origin as the
     *        origin.
     * \param x X offset of the drawable within the screen (used in the
     *        front_buffer case)
     * \param y Y offset of the drawable within the screen.
     * \param front_buffer boolean flag for whether the drawing to the
     *        drawable was actually done directly to the front buffer (instead
     *        of backing storage, for example)
     * \param loaderPrivate the data passed in at createNewDrawable time
     */
    void (*reportDamage)(__DRIdrawable *draw,
                         int x, int y,
                         drm_clip_rect_t *rects, int num_rects,
                         GLboolean front_buffer,
                         void *loaderPrivate);
};

#define __DRI_SWRAST_IMAGE_OP_DRAW      1
#define __DRI_SWRAST_IMAGE_OP_CLEAR     2
#define __DRI_SWRAST_IMAGE_OP_SWAP      3

/**
 * SWRast Loader extension.
 */
#define __DRI_SWRAST_LOADER "DRI_SWRastLoader"
#define __DRI_SWRAST_LOADER_VERSION 1
struct __DRIswrastLoaderExtensionRec {
    __DRIextension base;

    /*
     * Drawable position and size
     */
    void (*getDrawableInfo)(__DRIdrawable *drawable,
                            int *x, int *y, int *width, int *height,
                            void *loaderPrivate);

    /**
     * Put image to drawable
     */
    void (*putImage)(__DRIdrawable *drawable, int op,
                     int x, int y, int width, int height, char *data,
                     void *loaderPrivate);

    /**
     * Get image from drawable
     */
    void (*getImage)(__DRIdrawable *drawable,
                     int x, int y, int width, int height, char *data,
                     void *loaderPrivate);
};

/**
 * The remaining extensions describe driver extensions, immediately
 * available interfaces provided by the driver.  To start using the
 * driver, dlsym() for the __DRI_DRIVER_EXTENSIONS symbol and look for
 * the extension you need in the array.
 */
#define __DRI_DRIVER_EXTENSIONS "__driDriverExtensions"

/**
 * Tokens for __DRIconfig attribs.  A number of attributes defined by
 * GLX or EGL standards are not in the table, as they must be provided
 * by the loader.  For example, FBConfig ID or visual ID, drawable type.
 */

#define __DRI_ATTRIB_BUFFER_SIZE                 1
#define __DRI_ATTRIB_LEVEL                       2
#define __DRI_ATTRIB_RED_SIZE                    3
#define __DRI_ATTRIB_GREEN_SIZE                  4
#define __DRI_ATTRIB_BLUE_SIZE                   5
#define __DRI_ATTRIB_LUMINANCE_SIZE              6
#define __DRI_ATTRIB_ALPHA_SIZE                  7
#define __DRI_ATTRIB_ALPHA_MASK_SIZE             8
#define __DRI_ATTRIB_DEPTH_SIZE                  9
#define __DRI_ATTRIB_STENCIL_SIZE               10
#define __DRI_ATTRIB_ACCUM_RED_SIZE             11
#define __DRI_ATTRIB_ACCUM_GREEN_SIZE           12
#define __DRI_ATTRIB_ACCUM_BLUE_SIZE            13
#define __DRI_ATTRIB_ACCUM_ALPHA_SIZE           14
#define __DRI_ATTRIB_SAMPLE_BUFFERS             15
#define __DRI_ATTRIB_SAMPLES                    16
#define __DRI_ATTRIB_RENDER_TYPE                17
#define __DRI_ATTRIB_CONFIG_CAVEAT              18
#define __DRI_ATTRIB_CONFORMANT                 19
#define __DRI_ATTRIB_DOUBLE_BUFFER              20
#define __DRI_ATTRIB_STEREO                     21
#define __DRI_ATTRIB_AUX_BUFFERS                22
#define __DRI_ATTRIB_TRANSPARENT_TYPE           23
#define __DRI_ATTRIB_TRANSPARENT_INDEX_VALUE    24
#define __DRI_ATTRIB_TRANSPARENT_RED_VALUE      25
#define __DRI_ATTRIB_TRANSPARENT_GREEN_VALUE    26
#define __DRI_ATTRIB_TRANSPARENT_BLUE_VALUE     27
#define __DRI_ATTRIB_TRANSPARENT_ALPHA_VALUE    28
#define __DRI_ATTRIB_FLOAT_MODE                 29
#define __DRI_ATTRIB_RED_MASK                   30
#define __DRI_ATTRIB_GREEN_MASK                 31
#define __DRI_ATTRIB_BLUE_MASK                  32
#define __DRI_ATTRIB_ALPHA_MASK                 33
#define __DRI_ATTRIB_MAX_PBUFFER_WIDTH          34
#define __DRI_ATTRIB_MAX_PBUFFER_HEIGHT         35
#define __DRI_ATTRIB_MAX_PBUFFER_PIXELS         36
#define __DRI_ATTRIB_OPTIMAL_PBUFFER_WIDTH      37
#define __DRI_ATTRIB_OPTIMAL_PBUFFER_HEIGHT     38
#define __DRI_ATTRIB_VISUAL_SELECT_GROUP        39
#define __DRI_ATTRIB_SWAP_METHOD                40
#define __DRI_ATTRIB_MAX_SWAP_INTERVAL          41
#define __DRI_ATTRIB_MIN_SWAP_INTERVAL          42
#define __DRI_ATTRIB_BIND_TO_TEXTURE_RGB        43
#define __DRI_ATTRIB_BIND_TO_TEXTURE_RGBA       44
#define __DRI_ATTRIB_BIND_TO_MIPMAP_TEXTURE     45
#define __DRI_ATTRIB_BIND_TO_TEXTURE_TARGETS    46
#define __DRI_ATTRIB_YINVERTED                  47

/* __DRI_ATTRIB_RENDER_TYPE */
#define __DRI_ATTRIB_RGBA_BIT                   0x01    
#define __DRI_ATTRIB_COLOR_INDEX_BIT            0x02
#define __DRI_ATTRIB_LUMINANCE_BIT              0x04

/* __DRI_ATTRIB_CONFIG_CAVEAT */
#define __DRI_ATTRIB_SLOW_BIT                   0x01
#define __DRI_ATTRIB_NON_CONFORMANT_CONFIG      0x02

/* __DRI_ATTRIB_TRANSPARENT_TYPE */
#define __DRI_ATTRIB_TRANSPARENT_RGB            0x00
#define __DRI_ATTRIB_TRANSPARENT_INDEX          0x01

/* __DRI_ATTRIB_BIND_TO_TEXTURE_TARGETS  */
#define __DRI_ATTRIB_TEXTURE_1D_BIT             0x01
#define __DRI_ATTRIB_TEXTURE_2D_BIT             0x02
#define __DRI_ATTRIB_TEXTURE_RECTANGLE_BIT      0x04

/**
 * This extension defines the core DRI functionality.
 */
#define __DRI_CORE "DRI_Core"
#define __DRI_CORE_VERSION 1

struct __DRIcoreExtensionRec {
    __DRIextension base;

    __DRIscreen *(*createNewScreen)(int screen, int fd,
                                    unsigned int sarea_handle,
                                    const __DRIextension **extensions,
                                    const __DRIconfig ***driverConfigs,
                                    void *loaderPrivate);

    void (*destroyScreen)(__DRIscreen *screen);

    const __DRIextension **(*getExtensions)(__DRIscreen *screen);

    int (*getConfigAttrib)(const __DRIconfig *config,
                           unsigned int attrib,
                           unsigned int *value);

    int (*indexConfigAttrib)(const __DRIconfig *config, int index,
                             unsigned int *attrib, unsigned int *value);

    __DRIdrawable *(*createNewDrawable)(__DRIscreen *screen,
                                        const __DRIconfig *config,
                                        unsigned int drawable_id,
                                        unsigned int head,
                                        void *loaderPrivate);

    void (*destroyDrawable)(__DRIdrawable *drawable);

    void (*swapBuffers)(__DRIdrawable *drawable);

    __DRIcontext *(*createNewContext)(__DRIscreen *screen,
                                      const __DRIconfig *config,
                                      __DRIcontext *shared,
                                      void *loaderPrivate);

    int (*copyContext)(__DRIcontext *dest,
                       __DRIcontext *src,
                       unsigned long mask);

    void (*destroyContext)(__DRIcontext *context);

    int (*bindContext)(__DRIcontext *ctx,
                       __DRIdrawable *pdraw,
                       __DRIdrawable *pread);

    int (*unbindContext)(__DRIcontext *ctx);
};

/**
 * Stored version of some component (i.e., server-side DRI module, kernel-side
 * DRM, etc.).
 * 
 * \todo
 * There are several data structures that explicitly store a major version,
 * minor version, and patch level.  These structures should be modified to
 * have a \c __DRIversionRec instead.
 */
struct __DRIversionRec {
    int    major;        /**< Major version number. */
    int    minor;        /**< Minor version number. */
    int    patch;        /**< Patch-level. */
};

/**
 * Framebuffer information record.  Used by libGL to communicate information
 * about the framebuffer to the driver's \c __driCreateNewScreen function.
 * 
 * In XFree86, most of this information is derrived from data returned by
 * calling \c XF86DRIGetDeviceInfo.
 *
 * \sa XF86DRIGetDeviceInfo __DRIdisplayRec::createNewScreen
 *     __driUtilCreateNewScreen CallCreateNewScreen
 *
 * \bug This structure could be better named.
 */
struct __DRIframebufferRec {
    unsigned char *base;    /**< Framebuffer base address in the CPU's
                             * address space.  This value is calculated by
                             * calling \c drmMap on the framebuffer handle
                             * returned by \c XF86DRIGetDeviceInfo (or a
                             * similar function).
                             */
    int size;               /**< Framebuffer size, in bytes. */
    int stride;             /**< Number of bytes from one line to the next. */
    int width;              /**< Pixel width of the framebuffer. */
    int height;             /**< Pixel height of the framebuffer. */
    int dev_priv_size;      /**< Size of the driver's dev-priv structure. */
    void *dev_priv;         /**< Pointer to the driver's dev-priv structure. */
};


/**
 * This extension provides alternative screen, drawable and context
 * constructors for legacy DRI functionality.  This is used in
 * conjunction with the core extension.
 */
#define __DRI_LEGACY "DRI_Legacy"
#define __DRI_LEGACY_VERSION 1

struct __DRIlegacyExtensionRec {
    __DRIextension base;

    __DRIscreen *(*createNewScreen)(int screen,
                                    const __DRIversion *ddx_version,
                                    const __DRIversion *dri_version,
                                    const __DRIversion *drm_version,
                                    const __DRIframebuffer *frame_buffer,
                                    void *pSAREA, int fd, 
                                    const __DRIextension **extensions,
                                    const __DRIconfig ***driver_configs,
                                    void *loaderPrivate);

    __DRIdrawable *(*createNewDrawable)(__DRIscreen *screen,
                                        const __DRIconfig *config,
                                        drm_drawable_t hwDrawable,
                                        int renderType, const int *attrs,
                                        void *loaderPrivate);

    __DRIcontext *(*createNewContext)(__DRIscreen *screen,
                                      const __DRIconfig *config,
                                      int render_type,
                                      __DRIcontext *shared,
                                      drm_context_t hwContext,
                                      void *loaderPrivate);
};

/**
 * This extension provides alternative screen, drawable and context
 * constructors for swrast DRI functionality.  This is used in
 * conjunction with the core extension.
 */
#define __DRI_SWRAST "DRI_SWRast"
#define __DRI_SWRAST_VERSION 1

struct __DRIswrastExtensionRec {
    __DRIextension base;

    __DRIscreen *(*createNewScreen)(int screen,
                                    const __DRIextension **extensions,
                                    const __DRIconfig ***driver_configs,
                                    void *loaderPrivate);

    __DRIdrawable *(*createNewDrawable)(__DRIscreen *screen,
                                        const __DRIconfig *config,
                                        void *loaderPrivate);
};

/**
 * DRI2 Loader extension.
 */
#define __DRI_BUFFER_FRONT_LEFT         0
#define __DRI_BUFFER_BACK_LEFT          1
#define __DRI_BUFFER_FRONT_RIGHT        2
#define __DRI_BUFFER_BACK_RIGHT         3
#define __DRI_BUFFER_DEPTH              4
#define __DRI_BUFFER_STENCIL            5
#define __DRI_BUFFER_ACCUM              6
#define __DRI_BUFFER_FAKE_FRONT_LEFT    7
#define __DRI_BUFFER_FAKE_FRONT_RIGHT   8
#define __DRI_BUFFER_DEPTH_STENCIL      9  /**< Only available with DRI2 1.1 */

struct __DRIbufferRec {
    unsigned int attachment;
    unsigned int name;
    unsigned int pitch;
    unsigned int cpp;
    unsigned int flags;
};

#define __DRI_DRI2_LOADER "DRI_DRI2Loader"
#define __DRI_DRI2_LOADER_VERSION 3
struct __DRIdri2LoaderExtensionRec {
    __DRIextension base;

    __DRIbuffer *(*getBuffers)(__DRIdrawable *driDrawable,
                               int *width, int *height,
                               unsigned int *attachments, int count,
                               int *out_count, void *loaderPrivate);

    /**
     * Flush pending front-buffer rendering
     *
     * Any rendering that has been performed to the
     * \c __DRI_BUFFER_FAKE_FRONT_LEFT will be flushed to the
     * \c __DRI_BUFFER_FRONT_LEFT.
     *
     * \param driDrawable    Drawable whose front-buffer is to be flushed
     * \param loaderPrivate  Loader's private data that was previously passed
     *                       into __DRIdri2ExtensionRec::createNewDrawable
     */
    void (*flushFrontBuffer)(__DRIdrawable *driDrawable, void *loaderPrivate);


    /**
     * Get list of buffers from the server
     *
     * Gets a list of buffer for the specified set of attachments.  Unlike
     * \c ::getBuffers, this function takes a list of attachments paired with
     * opaque \c unsigned \c int value describing the format of the buffer.
     * It is the responsibility of the caller to know what the service that
     * allocates the buffers will expect to receive for the format.
     *
     * \param driDrawable    Drawable whose buffers are being queried.
     * \param width          Output where the width of the buffers is stored.
     * \param height         Output where the height of the buffers is stored.
     * \param attachments    List of pairs of attachment ID and opaque format
     *                       requested for the drawable.
     * \param count          Number of attachment / format pairs stored in
     *                       \c attachments.
     * \param loaderPrivate  Loader's private data that was previously passed
     *                       into __DRIdri2ExtensionRec::createNewDrawable.
     */
    __DRIbuffer *(*getBuffersWithFormat)(__DRIdrawable *driDrawable,
                                         int *width, int *height,
                                         unsigned int *attachments, int count,
                                         int *out_count, void *loaderPrivate);
};

/**
 * This extension provides alternative screen, drawable and context
 * constructors for DRI2.
 */
#define __DRI_DRI2 "DRI_DRI2"
#define __DRI_DRI2_VERSION 1

struct __DRIdri2ExtensionRec {
    __DRIextension base;

    __DRIscreen *(*createNewScreen)(int screen, int fd,
                                    const __DRIextension **extensions,
                                    const __DRIconfig ***driver_configs,
                                    void *loaderPrivate);

    __DRIdrawable *(*createNewDrawable)(__DRIscreen *screen,
                                        const __DRIconfig *config,
                                        void *loaderPrivate);

    __DRIcontext *(*createNewContext)(__DRIscreen *screen,
                                      const __DRIconfig *config,
                                      __DRIcontext *shared,
                                      void *loaderPrivate);

};

#endif