st/dri: Add multi-api support

Make st/dri screens capable of creating OpenGL ES and
OpenGL ES2 contexts.

TODO: Figure out the "get_current" problem with multiple
st_api's for real.

(s/API_OPENGLES1/API_OPENGLES/ by Chia-I Wu)

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

@@ -54,12 +54,14 @@ dri_create_context(gl_api api, const __GLcontextModes * visual,
 {
    __DRIscreen *sPriv = cPriv->driScreenPriv;
    struct dri_screen *screen = dri_screen(sPriv);
-   struct st_api *stapi = screen->st_api;
+   struct st_api *stapi;
    struct dri_context *ctx = NULL;
    struct st_context_iface *st_share = NULL;
    struct st_visual stvis;
 
-   if (api != API_OPENGL)
+   assert(api <= API_OPENGLES2);
+   stapi = screen->st_api[api];
+   if (!stapi)
       return GL_FALSE;
 
    if (sharedContextPrivate) {
@@ -71,6 +73,7 @@ dri_create_context(gl_api api, const __GLcontextModes * visual,
       goto fail;
 
    cPriv->driverPrivate = ctx;
+   ctx->api = api;
    ctx->cPriv = cPriv;
    ctx->sPriv = sPriv;
    ctx->lock = screen->drmLock;
@@ -124,7 +127,7 @@ dri_unbind_context(__DRIcontext * cPriv)
    /* dri_util.c ensures cPriv is not null */
    struct dri_screen *screen = dri_screen(cPriv->driScreenPriv);
    struct dri_context *ctx = dri_context(cPriv);
-   struct st_api *stapi = screen->st_api;
+   struct st_api *stapi = screen->st_api[ctx->api];
 
    if (--ctx->bind_count == 0) {
       if (ctx->st == stapi->get_current(stapi)) {
@@ -144,7 +147,7 @@ dri_make_current(__DRIcontext * cPriv,
    /* dri_util.c ensures cPriv is not null */
    struct dri_screen *screen = dri_screen(cPriv->driScreenPriv);
    struct dri_context *ctx = dri_context(cPriv);
-   struct st_api *stapi = screen->st_api;
+   struct st_api *stapi = screen->st_api[ctx->api];
    struct dri_drawable *draw = dri_drawable(driDrawPriv);
    struct dri_drawable *read = dri_drawable(driReadPriv);
    struct st_context_iface *old_st = stapi->get_current(stapi);
@@ -172,10 +175,24 @@ struct dri_context *
 dri_get_current(__DRIscreen *sPriv)
 {
    struct dri_screen *screen = dri_screen(sPriv);
-   struct st_api *stapi = screen->st_api;
-   struct st_context_iface *st;
+   struct st_api *stapi;
+   struct st_context_iface *st = NULL;
+   gl_api api;
 
-   st = stapi->get_current(stapi);
+   /* XXX: How do we do this when the screen supports
+      multiple rendering API's? Pick the first one,
+      like this? (NB: all three API's use the same
+      implementation of get_current (see st_manager.c),
+      so maybe it doesn't matter right now since
+      they'll all return the same result.) */
+   for (api = API_OPENGL; api <= API_OPENGLES2; ++api) {
+      stapi = screen->st_api[api];
+      if (!stapi)
+         continue;
+      st = stapi->get_current(stapi);
+      if (st)
+         break;
+   }
 
    return (struct dri_context *) (st) ? st->st_manager_private : NULL;
 }

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

@@ -58,6 +58,7 @@ struct dri_context
    unsigned int bind_count;
 
    /* gallium */
+   gl_api api;
    struct st_context_iface *st;
 
    /* hooks filled in by dri2 & drisw */

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

@@ -344,8 +344,10 @@ dri_destroy_option_cache(struct dri_screen * screen)
 void
 dri_destroy_screen_helper(struct dri_screen * screen)
 {
-   if (screen->st_api && screen->st_api->destroy)
-      screen->st_api->destroy(screen->st_api);
+   gl_api api;
+   for (api = API_OPENGL; api <= API_OPENGLES2; ++api)
+      if (screen->st_api[api] && screen->st_api[api]->destroy)
+         screen->st_api[api]->destroy(screen->st_api[api]);
 
    if (screen->base.screen)
       screen->base.screen->destroy(screen->base.screen);
@@ -378,9 +380,14 @@ dri_init_screen_helper(struct dri_screen *screen,
 
    screen->base.get_egl_image = dri_get_egl_image;
    screen->base.get_param = dri_get_param;
-   screen->st_api = st_gl_api_create();
 
-   if (!screen->st_api)
+   screen->st_api[API_OPENGL] = st_gl_api_create();
+   screen->st_api[API_OPENGLES1] = st_gl_api_create_es1();
+   screen->st_api[API_OPENGLES2] = st_gl_api_create_es2();
+
+   if (!screen->st_api[API_OPENGL] &&
+       !screen->st_api[API_OPENGLES1] &&
+       !screen->st_api[API_OPENGLES2])
       return NULL;
 
    if(pscreen->get_param(pscreen, PIPE_CAP_NPOT_TEXTURES))

src/gallium/state_trackers/dri/common/dri_screen.h

@@ -47,7 +47,7 @@ struct dri_screen
 {
    /* st_api */
    struct st_manager base;
-   struct st_api *st_api;
+   struct st_api *st_api[1+API_OPENGLES2]; /* GL, GLES1, GLES2 */
 
    /* on old libGL's invalidate doesn't get called as it should */
    boolean broken_invalidate;

src/gallium/state_trackers/dri/drm/dri2.c

@@ -439,6 +439,14 @@ dri2_init_screen(__DRIscreen * sPriv)
    if (!configs)
       goto fail;
 
+   sPriv->api_mask = 0;
+   if (screen->st_api[API_OPENGL])
+      sPriv->api_mask |= 1 << __DRI_API_OPENGL;
+   if (screen->st_api[API_OPENGLES1])
+      sPriv->api_mask |= 1 << __DRI_API_GLES;
+   if (screen->st_api[API_OPENGLES2])
+      sPriv->api_mask |= 1 << __DRI_API_GLES2;
+
    screen->auto_fake_front = dri_with_format(sPriv);
    screen->broken_invalidate = !sPriv->dri2.useInvalidate;