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

   1 /**************************************************************************
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   3  * Copyright 2009, VMware, Inc.
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  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_visual stvis;
  61
  62    switch (api) {
  63    case API_OPENGL:
  64       stapi = screen->st_api[ST_API_OPENGL];
  65       break;
  66    case API_OPENGLES:
  67       stapi = screen->st_api[ST_API_OPENGL_ES1];
  68       break;
  69    case API_OPENGLES2:
  70       stapi = screen->st_api[ST_API_OPENGL_ES2];
  71       break;
  72    default:
  73       stapi = NULL;
  74       break;
  75    }
  76    if (!stapi)
  77       return GL_FALSE;
  78
  79    if (sharedContextPrivate) {
  80       st_share = ((struct dri_context *)sharedContextPrivate)->st;
  81    }
  82
  83    ctx = CALLOC_STRUCT(dri_context);
  84    if (ctx == NULL)
  85       goto fail;
  86
  87    cPriv->driverPrivate = ctx;
  88    ctx->cPriv = cPriv;
  89    ctx->sPriv = sPriv;
  90    ctx->lock = screen->drmLock;
  91
  92    driParseConfigFiles(&ctx->optionCache,
  93                        &screen->optionCache, sPriv->myNum, "dri");
  94
  95    dri_fill_st_visual(&stvis, screen, visual);
  96    ctx->st = stapi->create_context(stapi, &screen->base, &stvis, st_share);
  97    if (ctx->st == NULL)
  98       goto fail;
  99    ctx->st->st_manager_private = (void *) ctx;
 100    ctx->stapi = stapi;
 101
 102    dri_init_extensions(ctx);
 103
 104    return GL_TRUE;
 105
 106  fail:
 107    if (ctx && ctx->st)
 108       ctx->st->destroy(ctx->st);
 109
 110    FREE(ctx);
 111    return GL_FALSE;
 112 }
 113
 114 void
 115 dri_destroy_context(__DRIcontext * cPriv)
 116 {
 117    struct dri_context *ctx = dri_context(cPriv);
 118
 119    /* note: we are freeing values and nothing more because
 120     * driParseConfigFiles allocated values only - the rest
 121     * is owned by screen optionCache.
 122     */
 123    FREE(ctx->optionCache.values);
 124
 125    /* No particular reason to wait for command completion before
 126     * destroying a context, but it is probably worthwhile flushing it
 127     * to avoid having to add code elsewhere to cope with flushing a
 128     * partially destroyed context.
 129     */
 130    ctx->st->flush(ctx->st, 0, NULL);
 131    ctx->st->destroy(ctx->st);
 132
 133    FREE(ctx);
 134 }
 135
 136 GLboolean
 137 dri_unbind_context(__DRIcontext * cPriv)
 138 {
 139    /* dri_util.c ensures cPriv is not null */
 140    struct dri_context *ctx = dri_context(cPriv);
 141
 142    if (--ctx->bind_count == 0) {
 143       if (ctx->st == ctx->stapi->get_current(ctx->stapi)) {
 144          ctx->st->flush(ctx->st, PIPE_FLUSH_RENDER_CACHE, NULL);
 145          ctx->stapi->make_current(ctx->stapi, NULL, NULL, NULL);
 146       }
 147    }
 148
 149    return GL_TRUE;
 150 }
 151
 152 GLboolean
 153 dri_make_current(__DRIcontext * cPriv,
 154                  __DRIdrawable * driDrawPriv,
 155                  __DRIdrawable * driReadPriv)
 156 {
 157    /* dri_util.c ensures cPriv is not null */
 158    struct dri_context *ctx = dri_context(cPriv);
 159    struct dri_drawable *draw = dri_drawable(driDrawPriv);
 160    struct dri_drawable *read = dri_drawable(driReadPriv);
 161    struct st_context_iface *old_st = ctx->stapi->get_current(ctx->stapi);
 162
 163    if (old_st && old_st != ctx->st)
 164       old_st->flush(old_st, PIPE_FLUSH_RENDER_CACHE, NULL);
 165
 166    ++ctx->bind_count;
 167
 168    if (ctx->dPriv != driDrawPriv) {
 169       ctx->dPriv = driDrawPriv;
 170       draw->texture_stamp = driDrawPriv->lastStamp - 1;
 171    }
 172    if (ctx->rPriv != driReadPriv) {
 173       ctx->rPriv = driReadPriv;
 174       read->texture_stamp = driReadPriv->lastStamp - 1;
 175    }
 176
 177    ctx->stapi->make_current(ctx->stapi, ctx->st, &draw->base, &read->base);
 178
 179    return GL_TRUE;
 180 }
 181
 182 struct dri_context *
 183 dri_get_current(__DRIscreen *sPriv)
 184 {
 185    struct dri_screen *screen = dri_screen(sPriv);
 186    struct st_api *stapi;
 187    struct st_context_iface *st = NULL;
 188    gl_api api;
 189
 190    /* XXX: How do we do this when the screen supports
 191       multiple rendering API's? Pick the first one,
 192       like this? (NB: all three API's use the same
 193       implementation of get_current (see st_manager.c),
 194       so maybe it doesn't matter right now since
 195       they'll all return the same result.) */
 196    for (api = API_OPENGL; api <= API_OPENGLES2; ++api) {
 197       stapi = screen->st_api[api];
 198       if (!stapi)
 199          continue;
 200       st = stapi->get_current(stapi);
 201       if (st)
 202          break;
 203    }
 204
 205    return (struct dri_context *) (st) ? st->st_manager_private : NULL;
 206 }
 207
 208 /* vim: set sw=3 ts=8 sts=3 expandtab: */