src/mesa/drivers/dri/common/dri_util.h

   1 /*
   2  * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial portions
  15  * of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  20  * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
  21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 /**
  27  * \file dri_util.h
  28  * DRI utility functions definitions.
  29  *
  30  * This module acts as glue between GLX and the actual hardware driver.  A DRI
  31  * driver doesn't really \e have to use any of this - it's optional.  But, some
  32  * useful stuff is done here that otherwise would have to be duplicated in most
  33  * drivers.
  34  *
  35  * Basically, these utility functions take care of some of the dirty details of
  36  * screen initialization, context creation, context binding, DRM setup, etc.
  37  *
  38  * These functions are compiled into each DRI driver so libGL.so knows nothing
  39  * about them.
  40  *
  41  * \sa dri_util.c.
  42  *
  43  * \author Kevin E. Martin <kevin@precisioninsight.com>
  44  * \author Brian Paul <brian@precisioninsight.com>
  45  */
  46
  47 /**
  48  * The following structs are shared between DRISW and DRI2, the DRISW structs
  49  * are essentially base classes of the DRI2 structs. DRISW needs to compile on
  50  * platforms without DRM, so keep the structs opaque to DRM.
  51  */
  52
  53 #ifndef _DRI_UTIL_H_
  54 #define _DRI_UTIL_H_
  55
  56 #include <GL/gl.h>
  57 #include <GL/internal/dri_interface.h>
  58 #include "main/menums.h"
  59 #include "main/formats.h"
  60 #include "util/xmlconfig.h"
  61 #include <stdbool.h>
  62
  63 struct gl_config;
  64 struct gl_context;
  65
  66 /**
  67  * Extensions.
  68  */
  69 extern const __DRIcoreExtension driCoreExtension;
  70 extern const __DRIswrastExtension driSWRastExtension;
  71 extern const __DRIdri2Extension driDRI2Extension;
  72 extern const __DRI2configQueryExtension dri2ConfigQueryExtension;
  73 extern const __DRIcopySubBufferExtension driCopySubBufferExtension;
  74 extern const __DRI2flushControlExtension dri2FlushControlExtension;
  75
  76 /**
  77  * Description of the attributes used to create a config.
  78  *
  79  * This is passed as the context_config parameter to CreateContext. The idea
  80  * with this struct is that it can be extended without having to modify all of
  81  * the drivers. The first three members (major/minor_version and flags) are
  82  * always valid, but the remaining members are only valid if the corresponding
  83  * flag is set for the attribute. If the flag is not set then the default
  84  * value should be assumed. That way the driver can quickly check if any
  85  * attributes were set that it doesn't understand and report an error.
  86  */
  87 struct __DriverContextConfig {
  88     /* These members are always valid */
  89     unsigned major_version;
  90     unsigned minor_version;
  91     uint32_t flags;
  92
  93     /* Flags describing which of the remaining members are valid */
  94     uint32_t attribute_mask;
  95
  96     /* Only valid if __DRIVER_CONTEXT_ATTRIB_RESET_STRATEGY is set */
  97     int reset_strategy;
  98
  99     /* Only valid if __DRIVER_CONTEXT_PRIORITY is set */
 100     unsigned priority;
 101
 102     /* Only valid if __DRIVER_CONTEXT_ATTRIB_RELEASE_BEHAVIOR is set */
 103     int release_behavior;
 104 };
 105
 106 #define __DRIVER_CONTEXT_ATTRIB_RESET_STRATEGY   (1 << 0)
 107 #define __DRIVER_CONTEXT_ATTRIB_PRIORITY         (1 << 1)
 108 #define __DRIVER_CONTEXT_ATTRIB_RELEASE_BEHAVIOR (1 << 2)
 109
 110 /**
 111  * Driver callback functions.
 112  *
 113  * Each DRI driver must have one of these structures with all the pointers set
 114  * to appropriate functions within the driver.
 115  *
 116  * When glXCreateContext() is called, for example, it'll call a helper function
 117  * dri_util.c which in turn will jump through the \a CreateContext pointer in
 118  * this structure.
 119  */
 120 struct __DriverAPIRec {
 121     const __DRIconfig **(*InitScreen) (__DRIscreen * priv);
 122
 123     void (*DestroyScreen)(__DRIscreen *driScrnPriv);
 124
 125     GLboolean (*CreateContext)(gl_api api,
 126                                const struct gl_config *glVis,
 127                                __DRIcontext *driContextPriv,
 128                                const struct __DriverContextConfig *ctx_config,
 129                                unsigned *error,
 130                                void *sharedContextPrivate);
 131
 132     void (*DestroyContext)(__DRIcontext *driContextPriv);
 133
 134     GLboolean (*CreateBuffer)(__DRIscreen *driScrnPriv,
 135                               __DRIdrawable *driDrawPriv,
 136                               const struct gl_config *glVis,
 137                               GLboolean pixmapBuffer);
 138
 139     void (*DestroyBuffer)(__DRIdrawable *driDrawPriv);
 140
 141     void (*SwapBuffers)(__DRIdrawable *driDrawPriv);
 142
 143     GLboolean (*MakeCurrent)(__DRIcontext *driContextPriv,
 144                              __DRIdrawable *driDrawPriv,
 145                              __DRIdrawable *driReadPriv);
 146
 147     GLboolean (*UnbindContext)(__DRIcontext *driContextPriv);
 148
 149     __DRIbuffer *(*AllocateBuffer) (__DRIscreen *screenPrivate,
 150                                     unsigned int attachment,
 151                                     unsigned int format,
 152                                     int width, int height);
 153
 154     void (*ReleaseBuffer) (__DRIscreen *screenPrivate, __DRIbuffer *buffer);
 155
 156     void (*CopySubBuffer)(__DRIdrawable *driDrawPriv, int x, int y,
 157                           int w, int h);
 158 };
 159
 160 extern const struct __DriverAPIRec driDriverAPI;
 161 extern const struct __DriverAPIRec *globalDriverAPI;
 162
 163 /**
 164  * Per-screen private driver information.
 165  */
 166 struct __DRIscreenRec {
 167     /**
 168      * Driver-specific entrypoints provided by the driver's
 169      * __DRIDriverVtableExtensionRec.
 170      */
 171     const struct __DriverAPIRec *driver;
 172
 173     /**
 174      * Current screen's number
 175      */
 176     int myNum;
 177
 178     /**
 179      * File descriptor returned when the kernel device driver is opened.
 180      *
 181      * Used to:
 182      *   - authenticate client to kernel
 183      *   - map the frame buffer, SAREA, etc.
 184      *   - close the kernel device driver
 185      */
 186     int fd;
 187
 188     /**
 189      * Device-dependent private information (not stored in the SAREA).
 190      *
 191      * This pointer is never touched by the DRI layer.
 192      */
 193     void *driverPrivate;
 194
 195     void *loaderPrivate;
 196
 197     int max_gl_core_version;
 198     int max_gl_compat_version;
 199     int max_gl_es1_version;
 200     int max_gl_es2_version;
 201
 202     const __DRIextension **extensions;
 203
 204     const __DRIswrastLoaderExtension *swrast_loader;
 205
 206     struct {
 207         /* Flag to indicate that this is a DRI2 screen.  Many of the above
 208          * fields will not be valid or initializaed in that case. */
 209         const __DRIdri2LoaderExtension *loader;
 210         const __DRIimageLookupExtension *image;
 211         const __DRIuseInvalidateExtension *useInvalidate;
 212         const __DRIbackgroundCallableExtension *backgroundCallable;
 213     } dri2;
 214
 215     struct {
 216         const __DRIimageLoaderExtension *loader;
 217     } image;
 218
 219     driOptionCache optionInfo;
 220     driOptionCache optionCache;
 221
 222     unsigned int api_mask;
 223 };
 224
 225 /**
 226  * Per-context private driver information.
 227  */
 228 struct __DRIcontextRec {
 229     /**
 230      * Device driver's private context data.  This structure is opaque.
 231      */
 232     void *driverPrivate;
 233
 234     /**
 235      * The loaders's private context data.  This structure is opaque.
 236      */
 237     void *loaderPrivate;
 238
 239     /**
 240      * Pointer to drawable currently bound to this context for drawing.
 241      */
 242     __DRIdrawable *driDrawablePriv;
 243
 244     /**
 245      * Pointer to drawable currently bound to this context for reading.
 246      */
 247     __DRIdrawable *driReadablePriv;
 248
 249     /**
 250      * Pointer to screen on which this context was created.
 251      */
 252     __DRIscreen *driScreenPriv;
 253
 254     struct {
 255         int draw_stamp;
 256         int read_stamp;
 257     } dri2;
 258 };
 259
 260 /**
 261  * Per-drawable private DRI driver information.
 262  */
 263 struct __DRIdrawableRec {
 264     /**
 265      * Driver's private drawable information.
 266      *
 267      * This structure is opaque.
 268      */
 269     void *driverPrivate;
 270
 271     /**
 272      * Private data from the loader.  We just hold on to it and pass
 273      * it back when calling into loader provided functions.
 274      */
 275     void *loaderPrivate;
 276
 277     /**
 278      * Pointer to context to which this drawable is currently bound.
 279      */
 280     __DRIcontext *driContextPriv;
 281
 282     /**
 283      * Pointer to screen on which this drawable was created.
 284      */
 285     __DRIscreen *driScreenPriv;
 286
 287     /**
 288      * Reference count for number of context's currently bound to this
 289      * drawable.
 290      *
 291      * Once it reaches zero, the drawable can be destroyed.
 292      *
 293      * \note This behavior will change with GLX 1.3.
 294      */
 295     int refcount;
 296
 297     /**
 298      * Last value of the stamp.
 299      *
 300      * If this differs from the value stored at __DRIdrawable::dri2.stamp,
 301      * then the drawable information has been modified by the X server, and the
 302      * drawable information (below) should be retrieved from the X server.
 303      */
 304     unsigned int lastStamp;
 305
 306     int w, h;
 307
 308     /**
 309      * Drawable timestamp.  Increased when the loader calls invalidate.
 310      */
 311     struct {
 312         unsigned int stamp;
 313     } dri2;
 314 };
 315
 316 extern uint32_t
 317 driGLFormatToImageFormat(mesa_format format);
 318
 319 extern mesa_format
 320 driImageFormatToGLFormat(uint32_t image_format);
 321
 322 extern void
 323 dri2InvalidateDrawable(__DRIdrawable *drawable);
 324
 325 extern void
 326 driUpdateFramebufferSize(struct gl_context *ctx, const __DRIdrawable *dPriv);
 327
 328 extern void
 329 driContextSetFlags(struct gl_context *ctx, uint32_t flags);
 330
 331 extern const __DRIimageDriverExtension driImageDriverExtension;
 332
 333 extern const __DRInoErrorExtension dri2NoErrorExtension;
 334
 335 #endif /* _DRI_UTIL_H_ */