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mutter/cogl/cogl-renderer.c
Neil Roberts 2616ae0fa9 Add a GL 3 driver 
This adds a new CoglDriver for GL 3 called COGL_DRIVER_GL3. When
requested, the GLX, EGL and SDL2 winsyss will set the necessary
attributes to request a forward-compatible core profile 3.1 context.
That means it will have no deprecated features.

To simplify the explosion of checks for specific combinations of
context->driver, many of these conditionals have now been replaced
with private feature flags that are checked instead. The GL and GLES
drivers now initialise these private feature flags depending on which
driver is used.

The fixed function backends now explicitly check whether the fixed
function private feature is available which means the GL3 driver will
fall back to always using the GLSL progend. Since Rob's latest patches
the GLSL progend no longer uses any fixed function API anyway so it
should just work.

The driver is currently lower priority than COGL_DRIVER_GL so it will
not be used unless it is specificly requested. We may want to change
this priority at some point because apparently Mesa can make some
memory savings if a core profile context is used.

In GL 3, getting the combined extensions string with glGetString is
deprecated so this patch changes it to use glGetStringi to build up an
array of extensions instead. _cogl_context_get_gl_extensions now
returns this array instead of trying to return a const string. The
caller is expected to free the array.

Some issues with this patch:

• GL 3 does not support GL_ALPHA format textures. We should probably
  make this a feature flag or something. Cogl uses this to render text
  which currently just throws a GL error and breaks so it's pretty
  important to do something about this before considering the GL3
  driver to be stable.

• GL 3 doesn't support client side vertex buffers. This probably
  doesn't matter because CoglBuffer won't normally use malloc'd
  buffers if VBOs are available, but it might but worth making
  malloc'd buffers a private feature and forcing it not to use them.

• GL 3 doesn't support the default vertex array object. This patch
  just makes it create and bind a single non-default vertex array
  object which gets used just like the normal default object. Ideally
  it would be good to use vertex array objects properly and attach
  them to a CoglPrimitive to cache the state.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit 66c9db993595b3a22e63f4c201ea468bc9b88cb6)
2013-01-22 17:48:01 +00:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2011 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Authors:
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include "cogl-util.h"
#include "cogl-internal.h"
#include "cogl-private.h"
#include "cogl-object.h"
#include "cogl-context-private.h"
#include "cogl-renderer.h"
#include "cogl-renderer-private.h"
#include "cogl-display-private.h"
#include "cogl-winsys-private.h"
#include "cogl-winsys-stub-private.h"
#include "cogl-config-private.h"
#include "cogl-error-private.h"
#ifdef COGL_HAS_EGL_PLATFORM_XLIB_SUPPORT
#include "cogl-winsys-egl-x11-private.h"
#endif
#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT
#include "cogl-winsys-egl-wayland-private.h"
#endif
#ifdef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
#include "cogl-winsys-egl-kms-private.h"
#endif
#ifdef COGL_HAS_EGL_PLATFORM_GDL_SUPPORT
#include "cogl-winsys-egl-gdl-private.h"
#endif
#ifdef COGL_HAS_EGL_PLATFORM_ANDROID_SUPPORT
#include "cogl-winsys-egl-android-private.h"
#endif
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_NULL_SUPPORT
#include "cogl-winsys-egl-null-private.h"
#endif
#ifdef COGL_HAS_GLX_SUPPORT
#include "cogl-winsys-glx-private.h"
#endif
#ifdef COGL_HAS_WGL_SUPPORT
#include "cogl-winsys-wgl-private.h"
#endif
#ifdef COGL_HAS_SDL_SUPPORT
#include "cogl-winsys-sdl-private.h"
#endif
#if COGL_HAS_XLIB_SUPPORT
#include "cogl-xlib-renderer.h"
#endif
typedef const CoglWinsysVtable *(*CoglWinsysVtableGetter) (void);
#ifdef HAVE_COGL_GL
extern const CoglTextureDriver _cogl_texture_driver_gl;
extern const CoglDriverVtable _cogl_driver_gl;
#endif
#if defined (HAVE_COGL_GLES) || defined (HAVE_COGL_GLES2)
extern const CoglTextureDriver _cogl_texture_driver_gles;
extern const CoglDriverVtable _cogl_driver_gles;
#endif
extern const CoglDriverVtable _cogl_driver_nop;
static CoglWinsysVtableGetter _cogl_winsys_vtable_getters[] =
{
#ifdef COGL_HAS_GLX_SUPPORT
_cogl_winsys_glx_get_vtable,
#endif
#ifdef COGL_HAS_EGL_PLATFORM_XLIB_SUPPORT
_cogl_winsys_egl_xlib_get_vtable,
#endif
#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT
_cogl_winsys_egl_wayland_get_vtable,
#endif
#ifdef COGL_HAS_EGL_PLATFORM_KMS_SUPPORT
_cogl_winsys_egl_kms_get_vtable,
#endif
#ifdef COGL_HAS_EGL_PLATFORM_GDL_SUPPORT
_cogl_winsys_egl_gdl_get_vtable,
#endif
#ifdef COGL_HAS_EGL_PLATFORM_ANDROID_SUPPORT
_cogl_winsys_egl_android_get_vtable,
#endif
#ifdef COGL_HAS_EGL_PLATFORM_POWERVR_NULL_SUPPORT
_cogl_winsys_egl_null_get_vtable,
#endif
#ifdef COGL_HAS_WGL_SUPPORT
_cogl_winsys_wgl_get_vtable,
#endif
#ifdef COGL_HAS_SDL_SUPPORT
_cogl_winsys_sdl_get_vtable,
#endif
_cogl_winsys_stub_get_vtable,
};
static void _cogl_renderer_free (CoglRenderer *renderer);
COGL_OBJECT_DEFINE (Renderer, renderer);
typedef struct _CoglNativeFilterClosure
{
CoglNativeFilterFunc func;
void *data;
} CoglNativeFilterClosure;
uint32_t
cogl_renderer_error_quark (void)
{
return g_quark_from_static_string ("cogl-renderer-error-quark");
}
static const CoglWinsysVtable *
_cogl_renderer_get_winsys (CoglRenderer *renderer)
{
return renderer->winsys_vtable;
}
static void
native_filter_closure_free (CoglNativeFilterClosure *closure)
{
g_slice_free (CoglNativeFilterClosure, closure);
}
static void
_cogl_renderer_free (CoglRenderer *renderer)
{
const CoglWinsysVtable *winsys = _cogl_renderer_get_winsys (renderer);
if (winsys)
winsys->renderer_disconnect (renderer);
#ifndef HAVE_DIRECTLY_LINKED_GL_LIBRARY
if (renderer->libgl_module)
g_module_close (renderer->libgl_module);
#endif
g_slist_foreach (renderer->event_filters,
(GFunc) native_filter_closure_free,
NULL);
g_slist_free (renderer->event_filters);
g_free (renderer);
}
CoglRenderer *
cogl_renderer_new (void)
{
CoglRenderer *renderer = g_new0 (CoglRenderer, 1);
_cogl_init ();
renderer->connected = FALSE;
renderer->event_filters = NULL;
#ifdef COGL_HAS_XLIB_SUPPORT
renderer->xlib_enable_event_retrieval = TRUE;
#endif
return _cogl_renderer_object_new (renderer);
}
#if COGL_HAS_XLIB_SUPPORT
void
cogl_xlib_renderer_set_foreign_display (CoglRenderer *renderer,
Display *xdisplay)
{
_COGL_RETURN_IF_FAIL (cogl_is_renderer (renderer));
/* NB: Renderers are considered immutable once connected */
_COGL_RETURN_IF_FAIL (!renderer->connected);
renderer->foreign_xdpy = xdisplay;
/* If the application is using a foreign display then we can assume
it will also do its own event retrieval */
cogl_xlib_renderer_set_event_retrieval_enabled (renderer, FALSE);
}
Display *
cogl_xlib_renderer_get_foreign_display (CoglRenderer *renderer)
{
_COGL_RETURN_VAL_IF_FAIL (cogl_is_renderer (renderer), NULL);
return renderer->foreign_xdpy;
}
void
cogl_xlib_renderer_set_event_retrieval_enabled (CoglRenderer *renderer,
CoglBool enable)
{
_COGL_RETURN_IF_FAIL (cogl_is_renderer (renderer));
/* NB: Renderers are considered immutable once connected */
_COGL_RETURN_IF_FAIL (!renderer->connected);
renderer->xlib_enable_event_retrieval = enable;
}
#endif /* COGL_HAS_XLIB_SUPPORT */
CoglBool
cogl_renderer_check_onscreen_template (CoglRenderer *renderer,
CoglOnscreenTemplate *onscreen_template,
CoglError **error)
{
CoglDisplay *display;
if (!cogl_renderer_connect (renderer, error))
return FALSE;
display = cogl_display_new (renderer, onscreen_template);
if (!cogl_display_setup (display, error))
{
cogl_object_unref (display);
return FALSE;
}
cogl_object_unref (display);
return TRUE;
}
static CoglBool
_cogl_renderer_choose_driver (CoglRenderer *renderer,
CoglError **error)
{
const char *driver_name = g_getenv ("COGL_DRIVER");
const char *libgl_name;
CoglBool support_gles2_constraint = FALSE;
GList *l;
if (!driver_name)
driver_name = _cogl_config_driver;
for (l = renderer->constraints; l; l = l->next)
{
CoglRendererConstraint constraint = GPOINTER_TO_UINT (l->data);
if (constraint == COGL_RENDERER_CONSTRAINT_SUPPORTS_COGL_GLES2)
{
support_gles2_constraint = TRUE;
if (!driver_name && renderer->driver_override == COGL_DRIVER_ANY)
renderer->driver_override = COGL_DRIVER_GLES2;
break;
}
}
#ifdef COGL_DEFAULT_DRIVER
if (!driver_name)
driver_name = COGL_DEFAULT_DRIVER;
#endif
#ifdef HAVE_COGL_GL
if (renderer->driver_override == COGL_DRIVER_GL ||
(renderer->driver_override == COGL_DRIVER_ANY &&
(driver_name == NULL || !g_ascii_strcasecmp (driver_name, "gl"))))
{
renderer->driver = COGL_DRIVER_GL;
libgl_name = COGL_GL_LIBNAME;
goto found;
}
if (renderer->driver_override == COGL_DRIVER_GL3 ||
(renderer->driver_override == COGL_DRIVER_ANY &&
(driver_name == NULL || !g_ascii_strcasecmp (driver_name, "gl3"))))
{
renderer->driver = COGL_DRIVER_GL3;
libgl_name = COGL_GL_LIBNAME;
goto found;
}
#endif
#ifdef HAVE_COGL_GLES2
if (renderer->driver_override == COGL_DRIVER_GLES2 ||
(renderer->driver_override == COGL_DRIVER_ANY &&
(driver_name == NULL || !g_ascii_strcasecmp (driver_name, "gles2"))))
{
renderer->driver = COGL_DRIVER_GLES2;
libgl_name = COGL_GLES2_LIBNAME;
goto found;
}
#endif
#ifdef HAVE_COGL_GLES
if (renderer->driver_override == COGL_DRIVER_GLES1 ||
(renderer->driver_override == COGL_DRIVER_ANY &&
(driver_name == NULL || !g_ascii_strcasecmp (driver_name, "gles1"))))
{
renderer->driver = COGL_DRIVER_GLES1;
libgl_name = COGL_GLES1_LIBNAME;
goto found;
}
#endif
if (renderer->driver_override == COGL_DRIVER_NOP ||
(renderer->driver_override == COGL_DRIVER_ANY &&
(driver_name == NULL || !g_ascii_strcasecmp (driver_name, "nop"))))
{
renderer->driver = COGL_DRIVER_NOP;
libgl_name = NULL;
goto found;
}
_cogl_set_error (error,
COGL_DRIVER_ERROR,
COGL_DRIVER_ERROR_NO_SUITABLE_DRIVER_FOUND,
"No suitable driver found");
return FALSE;
found:
if (support_gles2_constraint &&
renderer->driver != COGL_DRIVER_GLES2)
{
_cogl_set_error (error,
COGL_RENDERER_ERROR,
COGL_RENDERER_ERROR_BAD_CONSTRAINT,
"No suitable driver found");
return FALSE;
}
#ifndef HAVE_DIRECTLY_LINKED_GL_LIBRARY
if (renderer->driver == COGL_DRIVER_GL ||
renderer->driver == COGL_DRIVER_GL3 ||
renderer->driver == COGL_DRIVER_GLES1 ||
renderer->driver == COGL_DRIVER_GLES2)
{
renderer->libgl_module = g_module_open (libgl_name,
G_MODULE_BIND_LAZY);
if (renderer->libgl_module == NULL)
{
_cogl_set_error (error, COGL_DRIVER_ERROR,
COGL_DRIVER_ERROR_FAILED_TO_LOAD_LIBRARY,
"Failed to dynamically open the GL library \"%s\"",
libgl_name);
return FALSE;
}
}
#endif /* HAVE_DIRECTLY_LINKED_GL_LIBRARY */
switch (renderer->driver)
{
#ifdef HAVE_COGL_GL
case COGL_DRIVER_GL:
case COGL_DRIVER_GL3:
renderer->driver_vtable = &_cogl_driver_gl;
renderer->texture_driver = &_cogl_texture_driver_gl;
break;
#endif
#if defined (HAVE_COGL_GLES) || defined (HAVE_COGL_GLES2)
case COGL_DRIVER_GLES1:
case COGL_DRIVER_GLES2:
renderer->driver_vtable = &_cogl_driver_gles;
renderer->texture_driver = &_cogl_texture_driver_gles;
break;
#endif
case COGL_DRIVER_NOP:
default:
renderer->driver_vtable = &_cogl_driver_nop;
renderer->texture_driver = NULL;
}
return TRUE;
}
/* Final connection API */
CoglBool
cogl_renderer_connect (CoglRenderer *renderer, CoglError **error)
{
int i;
GString *error_message;
CoglBool constraints_failed = FALSE;
if (renderer->connected)
return TRUE;
/* The driver needs to be chosen before connecting the renderer
because eglInitialize requires the library containing the GL API
to be loaded before its called */
if (!_cogl_renderer_choose_driver (renderer, error))
return FALSE;
error_message = g_string_new ("");
for (i = 0; i < G_N_ELEMENTS (_cogl_winsys_vtable_getters); i++)
{
const CoglWinsysVtable *winsys = _cogl_winsys_vtable_getters[i]();
CoglError *tmp_error = NULL;
GList *l;
CoglBool skip_due_to_constraints = FALSE;
if (renderer->winsys_id_override != COGL_WINSYS_ID_ANY)
{
if (renderer->winsys_id_override != winsys->id)
continue;
}
else
{
char *user_choice = getenv ("COGL_RENDERER");
if (!user_choice)
user_choice = _cogl_config_renderer;
if (user_choice &&
g_ascii_strcasecmp (winsys->name, user_choice) != 0)
continue;
}
for (l = renderer->constraints; l; l = l->next)
{
CoglRendererConstraint constraint = GPOINTER_TO_UINT (l->data);
if (!(winsys->constraints & constraint))
{
skip_due_to_constraints = TRUE;
break;
}
}
if (skip_due_to_constraints)
{
constraints_failed |= TRUE;
continue;
}
/* At least temporarily we will associate this winsys with
* the renderer in-case ->renderer_connect calls API that
* wants to query the current winsys... */
renderer->winsys_vtable = winsys;
if (!winsys->renderer_connect (renderer, &tmp_error))
{
g_string_append_c (error_message, '\n');
g_string_append (error_message, tmp_error->message);
cogl_error_free (tmp_error);
}
else
{
renderer->connected = TRUE;
g_string_free (error_message, TRUE);
return TRUE;
}
}
if (!renderer->connected)
{
if (constraints_failed)
{
_cogl_set_error (error, COGL_RENDERER_ERROR,
COGL_RENDERER_ERROR_BAD_CONSTRAINT,
"Failed to connected to any renderer due to constraints");
return FALSE;
}
renderer->winsys_vtable = NULL;
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"Failed to connected to any renderer: %s",
error_message->str);
g_string_free (error_message, TRUE);
return FALSE;
}
return TRUE;
}
CoglFilterReturn
_cogl_renderer_handle_native_event (CoglRenderer *renderer,
void *event)
{
GSList *l, *next;
/* Pass the event on to all of the registered filters in turn */
for (l = renderer->event_filters; l; l = next)
{
CoglNativeFilterClosure *closure = l->data;
/* The next pointer is taken now so that we can handle the
closure being removed during emission */
next = l->next;
if (closure->func (event, closure->data) == COGL_FILTER_REMOVE)
return COGL_FILTER_REMOVE;
}
/* If the backend for the renderer also wants to see the events, it
should just register its own filter */
return COGL_FILTER_CONTINUE;
}
void
_cogl_renderer_add_native_filter (CoglRenderer *renderer,
CoglNativeFilterFunc func,
void *data)
{
CoglNativeFilterClosure *closure;
closure = g_slice_new (CoglNativeFilterClosure);
closure->func = func;
closure->data = data;
renderer->event_filters = g_slist_prepend (renderer->event_filters, closure);
}
void
_cogl_renderer_remove_native_filter (CoglRenderer *renderer,
CoglNativeFilterFunc func,
void *data)
{
GSList *l, *prev = NULL;
for (l = renderer->event_filters; l; prev = l, l = l->next)
{
CoglNativeFilterClosure *closure = l->data;
if (closure->func == func && closure->data == data)
{
native_filter_closure_free (closure);
if (prev)
prev->next = g_slist_delete_link (prev->next, l);
else
renderer->event_filters =
g_slist_delete_link (renderer->event_filters, l);
break;
}
}
}
void
cogl_renderer_set_winsys_id (CoglRenderer *renderer,
CoglWinsysID winsys_id)
{
_COGL_RETURN_IF_FAIL (!renderer->connected);
renderer->winsys_id_override = winsys_id;
}
CoglWinsysID
cogl_renderer_get_winsys_id (CoglRenderer *renderer)
{
_COGL_RETURN_VAL_IF_FAIL (renderer->connected, 0);
return renderer->winsys_vtable->id;
}
void *
_cogl_renderer_get_proc_address (CoglRenderer *renderer,
const char *name,
CoglBool in_core)
{
const CoglWinsysVtable *winsys = _cogl_renderer_get_winsys (renderer);
return winsys->renderer_get_proc_address (renderer, name, in_core);
}
int
cogl_renderer_get_n_fragment_texture_units (CoglRenderer *renderer)
{
int n = 0;
_COGL_GET_CONTEXT (ctx, 0);
#if defined (HAVE_COGL_GL) || defined (HAVE_COGL_GLES2)
if (cogl_has_feature (ctx, COGL_FEATURE_ID_GLSL))
GE (ctx, glGetIntegerv (GL_MAX_TEXTURE_IMAGE_UNITS, &n));
#endif
return n;
}
void
cogl_renderer_add_constraint (CoglRenderer *renderer,
CoglRendererConstraint constraint)
{
g_return_if_fail (!renderer->connected);
renderer->constraints = g_list_prepend (renderer->constraints,
GUINT_TO_POINTER (constraint));
}
void
cogl_renderer_remove_constraint (CoglRenderer *renderer,
CoglRendererConstraint constraint)
{
g_return_if_fail (!renderer->connected);
renderer->constraints = g_list_remove (renderer->constraints,
GUINT_TO_POINTER (constraint));
}
void
cogl_renderer_set_driver (CoglRenderer *renderer,
CoglDriver driver)
{
_COGL_RETURN_IF_FAIL (!renderer->connected);
renderer->driver_override = driver;
}
CoglDriver
cogl_renderer_get_driver (CoglRenderer *renderer)
{
_COGL_RETURN_VAL_IF_FAIL (renderer->connected, 0);
return renderer->driver;
}
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