src/gallium/state_trackers/dri/common/dri_context.c

   1 /**************************************************************************
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   3  * Copyright 2009, VMware, Inc.
   4  * All Rights Reserved.
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  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  26  **************************************************************************/
  27 /*
  28  * Author: Keith Whitwell <keithw@vmware.com>
  29  * Author: Jakob Bornecrantz <wallbraker@gmail.com>
  30  */
  31
  32 #include "utils.h"
  33
  34 #include "dri_screen.h"
  35 #include "dri_drawable.h"
  36 #include "dri_context.h"
  37
  38 #include "pipe/p_context.h"
  39 #include "state_tracker/st_context.h"
  40
  41 static void
  42 dri_init_extensions(struct dri_context *ctx)
  43 {
  44    struct st_context *st = (struct st_context *) ctx->st;
  45
  46    /* New extensions should be added in mesa/state_tracker/st_extensions.c
  47     * and not in this file. */
  48    driInitExtensions(st->ctx, NULL, GL_FALSE);
  49 }
  50
  51 GLboolean
  52 dri_create_context(gl_api api, const __GLcontextModes * visual,
  53                    __DRIcontext * cPriv, void *sharedContextPrivate)
  54 {
  55    __DRIscreen *sPriv = cPriv->driScreenPriv;
  56    struct dri_screen *screen = dri_screen(sPriv);
  57    struct st_api *stapi;
  58    struct dri_context *ctx = NULL;
  59    struct st_context_iface *st_share = NULL;
  60    struct st_context_attribs attribs;
  61
  62    memset(&attribs, 0, sizeof(attribs));
  63    switch (api) {
  64    case API_OPENGL:
  65       stapi = screen->st_api[ST_API_OPENGL];
  66       attribs.profile = ST_PROFILE_DEFAULT;
  67       break;
  68    case API_OPENGLES:
  69       stapi = screen->st_api[ST_API_OPENGL_ES1];
  70       attribs.profile = ST_PROFILE_OPENGL_ES1;
  71       break;
  72    case API_OPENGLES2:
  73       stapi = screen->st_api[ST_API_OPENGL_ES2];
  74       attribs.profile = ST_PROFILE_OPENGL_ES2;
  75       break;
  76    default:
  77       stapi = NULL;
  78       break;
  79    }
  80    if (!stapi)
  81       return GL_FALSE;
  82
  83    if (sharedContextPrivate) {
  84       st_share = ((struct dri_context *)sharedContextPrivate)->st;
  85    }
  86
  87    ctx = CALLOC_STRUCT(dri_context);
  88    if (ctx == NULL)
  89       goto fail;
  90
  91    cPriv->driverPrivate = ctx;
  92    ctx->cPriv = cPriv;
  93    ctx->sPriv = sPriv;
  94    ctx->lock = screen->drmLock;
  95
  96    driParseConfigFiles(&ctx->optionCache,
  97                        &screen->optionCache, sPriv->myNum, "dri");
  98
  99    dri_fill_st_visual(&attribs.visual, screen, visual);
 100    ctx->st = stapi->create_context(stapi, &screen->base, &attribs, st_share);
 101    if (ctx->st == NULL)
 102       goto fail;
 103    ctx->st->st_manager_private = (void *) ctx;
 104    ctx->stapi = stapi;
 105
 106    /*
 107     * libmesagallium.a that this state tracker will be linked to expects
 108     * OpenGL's _glapi_table.  That is, it expects libGL.so instead of
 109     * libGLESv1_CM.so or libGLESv2.so.  As there is no clean way to know the
 110     * shared library the app links to, use the api as a simple check.
 111     * It might be as well to simply remove this function call though.
 112     */
 113    if (api == API_OPENGL)
 114       dri_init_extensions(ctx);
 115
 116    return GL_TRUE;
 117
 118  fail:
 119    if (ctx && ctx->st)
 120       ctx->st->destroy(ctx->st);
 121
 122    FREE(ctx);
 123    return GL_FALSE;
 124 }
 125
 126 void
 127 dri_destroy_context(__DRIcontext * cPriv)
 128 {
 129    struct dri_context *ctx = dri_context(cPriv);
 130
 131    /* note: we are freeing values and nothing more because
 132     * driParseConfigFiles allocated values only - the rest
 133     * is owned by screen optionCache.
 134     */
 135    FREE(ctx->optionCache.values);
 136
 137    /* No particular reason to wait for command completion before
 138     * destroying a context, but it is probably worthwhile flushing it
 139     * to avoid having to add code elsewhere to cope with flushing a
 140     * partially destroyed context.
 141     */
 142    ctx->st->flush(ctx->st, 0, NULL);
 143    ctx->st->destroy(ctx->st);
 144
 145    FREE(ctx);
 146 }
 147
 148 GLboolean
 149 dri_unbind_context(__DRIcontext * cPriv)
 150 {
 151    /* dri_util.c ensures cPriv is not null */
 152    struct dri_context *ctx = dri_context(cPriv);
 153
 154    if (--ctx->bind_count == 0) {
 155       if (ctx->st == ctx->stapi->get_current(ctx->stapi)) {
 156          ctx->st->flush(ctx->st, PIPE_FLUSH_RENDER_CACHE, NULL);
 157          ctx->stapi->make_current(ctx->stapi, NULL, NULL, NULL);
 158       }
 159    }
 160
 161    return GL_TRUE;
 162 }
 163
 164 GLboolean
 165 dri_make_current(__DRIcontext * cPriv,
 166                  __DRIdrawable * driDrawPriv,
 167                  __DRIdrawable * driReadPriv)
 168 {
 169    /* dri_util.c ensures cPriv is not null */
 170    struct dri_context *ctx = dri_context(cPriv);
 171    struct dri_drawable *draw = dri_drawable(driDrawPriv);
 172    struct dri_drawable *read = dri_drawable(driReadPriv);
 173    struct st_context_iface *old_st = ctx->stapi->get_current(ctx->stapi);
 174
 175    if (old_st && old_st != ctx->st)
 176       old_st->flush(old_st, PIPE_FLUSH_RENDER_CACHE, NULL);
 177
 178    ++ctx->bind_count;
 179
 180    if (ctx->dPriv != driDrawPriv) {
 181       ctx->dPriv = driDrawPriv;
 182       draw->texture_stamp = driDrawPriv->lastStamp - 1;
 183    }
 184    if (ctx->rPriv != driReadPriv) {
 185       ctx->rPriv = driReadPriv;
 186       read->texture_stamp = driReadPriv->lastStamp - 1;
 187    }
 188
 189    ctx->stapi->make_current(ctx->stapi, ctx->st, &draw->base, &read->base);
 190
 191    return GL_TRUE;
 192 }
 193
 194 struct dri_context *
 195 dri_get_current(__DRIscreen *sPriv)
 196 {
 197    struct dri_screen *screen = dri_screen(sPriv);
 198    struct st_api *stapi;
 199    struct st_context_iface *st = NULL;
 200    gl_api api;
 201
 202    /* XXX: How do we do this when the screen supports
 203       multiple rendering API's? Pick the first one,
 204       like this? (NB: all three API's use the same
 205       implementation of get_current (see st_manager.c),
 206       so maybe it doesn't matter right now since
 207       they'll all return the same result.) */
 208    for (api = API_OPENGL; api <= API_OPENGLES2; ++api) {
 209       stapi = screen->st_api[api];
 210       if (!stapi)
 211          continue;
 212       st = stapi->get_current(stapi);
 213       if (st)
 214          break;
 215    }
 216
 217    return (struct dri_context *) (st) ? st->st_manager_private : NULL;
 218 }
 219
 220 /* vim: set sw=3 ts=8 sts=3 expandtab: */