mutter/cogl/winsys/cogl-winsys-egl-private.h
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

165 lines
4.2 KiB
C

/*
* 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, see <http://www.gnu.org/licenses/>.
*
*
*/
#ifndef __COGL_WINSYS_EGL_PRIVATE_H
#define __COGL_WINSYS_EGL_PRIVATE_H
#include "cogl-defines.h"
#include "cogl-winsys-private.h"
#include "cogl-context.h"
#include "cogl-context-private.h"
#include "cogl-framebuffer-private.h"
typedef struct _CoglWinsysEGLVtable
{
CoglBool
(* display_setup) (CoglDisplay *display,
CoglError **error);
void
(* display_destroy) (CoglDisplay *display);
CoglBool
(* context_created) (CoglDisplay *display,
CoglError **error);
void
(* cleanup_context) (CoglDisplay *display);
CoglBool
(* context_init) (CoglContext *context, CoglError **error);
void
(* context_deinit) (CoglContext *context);
CoglBool
(* onscreen_init) (CoglOnscreen *onscreen,
EGLConfig config,
CoglError **error);
void
(* onscreen_deinit) (CoglOnscreen *onscreen);
int
(* add_config_attributes) (CoglDisplay *display,
CoglFramebufferConfig *config,
EGLint *attributes);
} CoglWinsysEGLVtable;
typedef enum _CoglEGLWinsysFeature
{
COGL_EGL_WINSYS_FEATURE_SWAP_REGION =1L<<0,
COGL_EGL_WINSYS_FEATURE_EGL_IMAGE_FROM_X11_PIXMAP =1L<<1,
COGL_EGL_WINSYS_FEATURE_EGL_IMAGE_FROM_WAYLAND_BUFFER =1L<<2,
COGL_EGL_WINSYS_FEATURE_CREATE_CONTEXT =1L<<3
} CoglEGLWinsysFeature;
typedef struct _CoglRendererEGL
{
CoglEGLWinsysFeature private_features;
EGLDisplay edpy;
EGLint egl_version_major;
EGLint egl_version_minor;
/* Data specific to the EGL platform */
void *platform;
/* vtable for platform specific parts */
const CoglWinsysEGLVtable *platform_vtable;
/* Function pointers for EGL specific extensions */
#define COGL_WINSYS_FEATURE_BEGIN(a, b, c, d)
#define COGL_WINSYS_FEATURE_FUNCTION(ret, name, args) \
ret (APIENTRY * pf_ ## name) args;
#define COGL_WINSYS_FEATURE_END()
#include "cogl-winsys-egl-feature-functions.h"
#undef COGL_WINSYS_FEATURE_BEGIN
#undef COGL_WINSYS_FEATURE_FUNCTION
#undef COGL_WINSYS_FEATURE_END
} CoglRendererEGL;
typedef struct _CoglDisplayEGL
{
EGLContext egl_context;
EGLSurface dummy_surface;
EGLSurface egl_surface;
EGLConfig egl_config;
CoglBool found_egl_config;
EGLSurface current_read_surface;
EGLSurface current_draw_surface;
EGLContext current_context;
CoglBool pending_resize_notify;
/* Platform specific display data */
void *platform;
} CoglDisplayEGL;
typedef struct _CoglContextEGL
{
EGLSurface saved_draw_surface;
EGLSurface saved_read_surface;
} CoglContextEGL;
typedef struct _CoglOnscreenEGL
{
EGLSurface egl_surface;
CoglBool pending_resize_notify;
/* Platform specific data */
void *platform;
} CoglOnscreenEGL;
const CoglWinsysVtable *
_cogl_winsys_egl_get_vtable (void);
EGLBoolean
_cogl_winsys_egl_make_current (CoglDisplay *display,
EGLSurface draw,
EGLSurface read,
EGLContext context);
#ifdef EGL_KHR_image_base
EGLImageKHR
_cogl_egl_create_image (CoglContext *ctx,
EGLenum target,
EGLClientBuffer buffer,
const EGLint *attribs);
void
_cogl_egl_destroy_image (CoglContext *ctx,
EGLImageKHR image);
#endif
CoglBool
_cogl_winsys_egl_renderer_connect_common (CoglRenderer *renderer,
CoglError **error);
#endif /* __COGL_WINSYS_EGL_PRIVATE_H */