dri_interface.h

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

/*
 * 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 <[e-mail]>
 * \author Ian Romanick <[e-mail]>
 * \author Kristian Høgsberg <[e-mail]>
 */

#ifndef DRI_INTERFACE_H
#define DRI_INTERFACE_H

/* Make this something other than __APPLE__ for other arcs with no drm.h */
#ifndef __APPLE__
#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;
/*@}*/


/**
 * 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);
};


#define __DRI_TEX_BUFFER "DRI_TexBuffer"
#define __DRI_TEX_BUFFER_VERSION 1
struct __DRItexBufferExtensionRec {
    __DRIextension base;

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


/**
 * 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"