[cogl/wip/rib/cogl-1.12: 79/101] Add an SDL2 winsys
- From: Robert Bragg <rbragg src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [cogl/wip/rib/cogl-1.12: 79/101] Add an SDL2 winsys
- Date: Mon, 6 Aug 2012 13:07:41 +0000 (UTC)
commit 3ba28cb6307d87cb5d36a7b201c8db4dc6f01af6
Author: Neil Roberts <neil linux intel com>
Date: Thu Jun 14 14:42:16 2012 +0100
Add an SDL2 winsys
This adds an alternate version of the SDL winsys using the SDL 2 API.
The two versions are mutually exclusive and share the same
CoglWinsysID. Version 2 of SDL fits a little bit better with Cogl
because it supports multiple windows and the video subsystem can be
initialised entirely independently of the rest of the subsystems.
The SDL2 winsys creates an invisible dummy window in order to bind the
GL context after creating the Cogl display. This is similar to how the
X11 winsys's work.
SDL2 seems to support compiling with support for both GL and GLES.
However there doesn't seem to be a way to select between the two
backends outside of SDL. In fact if you do compile them both in it
seems to break down because it will always try to use the window
system functions from the GLES backend because those are filled in
second in the vtable. However when creating the window it will always
prefer to use the GL function to choose a visual. This function gets
confused because the GL backend has not been initialised at that
point. The Cogl backend therefore just leaves it up to SDL to pick a
sensible backend. It will then verify that it picked a GL library
which matches the Cogl driver by checking the string from
glGetString(GL_VERSION).
Reviewed-by: Robert Bragg <robert linux intel com>
(cherry picked from commit 6cb5ab41355e7bfe28f367cf4afa39a7afcfeec2)
cogl/Makefile.am | 7 +
cogl/cogl-sdl.c | 6 +-
cogl/cogl-sdl.h | 6 +-
cogl/winsys/cogl-winsys-sdl2.c | 415 ++++++++++++++++++++++++++++++++++++++++
configure.ac | 26 +++-
examples/Makefile.am | 6 +
examples/cogl-sdl2-hello.c | 137 +++++++++++++
7 files changed, 596 insertions(+), 7 deletions(-)
---
diff --git a/cogl/Makefile.am b/cogl/Makefile.am
index 44cbc65..95f8482 100644
--- a/cogl/Makefile.am
+++ b/cogl/Makefile.am
@@ -471,6 +471,13 @@ cogl_sources_c += \
$(srcdir)/winsys/cogl-winsys-sdl.c \
$(srcdir)/cogl-sdl.c
endif
+if SUPPORT_SDL2
+cogl_experimental_h += $(srcdir)/cogl-sdl.h
+cogl_sources_c += \
+ $(srcdir)/winsys/cogl-winsys-sdl-private.h \
+ $(srcdir)/winsys/cogl-winsys-sdl2.c \
+ $(srcdir)/cogl-sdl.c
+endif
EXTRA_DIST += stb_image.c
diff --git a/cogl/cogl-sdl.c b/cogl/cogl-sdl.c
index 76932c3..5de1683 100644
--- a/cogl/cogl-sdl.c
+++ b/cogl/cogl-sdl.c
@@ -31,13 +31,13 @@
#include "cogl-renderer-private.h"
void
-cogl_sdl_renderer_set_event_type (CoglRenderer *renderer, uint8_t type)
+cogl_sdl_renderer_set_event_type (CoglRenderer *renderer, int type)
{
renderer->sdl_event_type_set = TRUE;
renderer->sdl_event_type = type;
}
-uint8_t
+int
cogl_sdl_renderer_get_event_type (CoglRenderer *renderer)
{
_COGL_RETURN_VAL_IF_FAIL (renderer->sdl_event_type_set, SDL_USEREVENT);
@@ -46,7 +46,7 @@ cogl_sdl_renderer_get_event_type (CoglRenderer *renderer)
}
CoglContext *
-cogl_sdl_context_new (uint8_t type, GError **error)
+cogl_sdl_context_new (int type, GError **error)
{
CoglRenderer *renderer = cogl_renderer_new ();
CoglDisplay *display;
diff --git a/cogl/cogl-sdl.h b/cogl/cogl-sdl.h
index bf2eafa..0a3c463 100644
--- a/cogl/cogl-sdl.h
+++ b/cogl/cogl-sdl.h
@@ -123,7 +123,7 @@ G_BEGIN_DECLS
* Stability: unstable
*/
CoglContext *
-cogl_sdl_context_new (uint8_t type, GError **error);
+cogl_sdl_context_new (int type, GError **error);
/**
* cogl_sdl_renderer_set_event_type:
@@ -147,7 +147,7 @@ cogl_sdl_context_new (uint8_t type, GError **error);
* Stability: unstable
*/
void
-cogl_sdl_renderer_set_event_type (CoglRenderer *renderer, uint8_t type);
+cogl_sdl_renderer_set_event_type (CoglRenderer *renderer, int type);
/**
* cogl_sdl_renderer_get_event_type:
@@ -161,7 +161,7 @@ cogl_sdl_renderer_set_event_type (CoglRenderer *renderer, uint8_t type);
* Since: 2.0
* Stability: unstable
*/
-uint8_t
+int
cogl_sdl_renderer_get_event_type (CoglRenderer *renderer);
/**
diff --git a/cogl/winsys/cogl-winsys-sdl2.c b/cogl/winsys/cogl-winsys-sdl2.c
new file mode 100644
index 0000000..44843ad
--- /dev/null
+++ b/cogl/winsys/cogl-winsys-sdl2.c
@@ -0,0 +1,415 @@
+/*
+ * Cogl
+ *
+ * An object oriented GL/GLES Abstraction/Utility Layer
+ *
+ * Copyright (C) 2011, 2012 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/>.
+ *
+ *
+ * Authors:
+ * Neil Roberts <neil linux intel com>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <SDL.h>
+
+#include "cogl-renderer-private.h"
+#include "cogl-display-private.h"
+#include "cogl-framebuffer-private.h"
+#include "cogl-swap-chain-private.h"
+#include "cogl-onscreen-template-private.h"
+#include "cogl-context-private.h"
+#include "cogl-onscreen-private.h"
+#include "cogl-winsys-sdl-private.h"
+
+typedef struct _CoglContextSdl2
+{
+ SDL_Window *current_window;
+} CoglContextSdl2;
+
+typedef struct _CoglRendererSdl2
+{
+ int stub;
+} CoglRendererSdl2;
+
+typedef struct _CoglDisplaySdl2
+{
+ SDL_Window *dummy_window;
+ SDL_GLContext *context;
+} CoglDisplaySdl2;
+
+typedef struct _CoglOnscreenSdl2
+{
+ SDL_Window *window;
+} CoglOnscreenSdl2;
+
+static CoglFuncPtr
+_cogl_winsys_renderer_get_proc_address (CoglRenderer *renderer,
+ const char *name)
+{
+ return SDL_GL_GetProcAddress (name);
+}
+
+static void
+_cogl_winsys_renderer_disconnect (CoglRenderer *renderer)
+{
+ SDL_VideoQuit ();
+
+ g_slice_free (CoglRendererSdl2, renderer->winsys);
+}
+
+static CoglBool
+_cogl_winsys_renderer_connect (CoglRenderer *renderer,
+ GError **error)
+{
+ if (SDL_VideoInit (NULL) < 0)
+ {
+ g_set_error (error, COGL_WINSYS_ERROR,
+ COGL_WINSYS_ERROR_INIT,
+ "SDL_Init failed: %s",
+ SDL_GetError ());
+ return FALSE;
+ }
+
+ renderer->winsys = g_slice_new0 (CoglRendererSdl2);
+
+ return TRUE;
+}
+
+static void
+_cogl_winsys_display_destroy (CoglDisplay *display)
+{
+ CoglDisplaySdl2 *sdl_display = display->winsys;
+
+ _COGL_RETURN_IF_FAIL (sdl_display != NULL);
+
+ if (sdl_display->context)
+ SDL_GL_DeleteContext (sdl_display->context);
+
+ if (sdl_display->dummy_window)
+ SDL_DestroyWindow (sdl_display->dummy_window);
+
+ g_slice_free (CoglDisplaySdl2, display->winsys);
+ display->winsys = NULL;
+}
+
+static void
+set_gl_attribs_from_framebuffer_config (CoglFramebufferConfig *config)
+{
+ SDL_GL_SetAttribute (SDL_GL_RED_SIZE, 1);
+ SDL_GL_SetAttribute (SDL_GL_GREEN_SIZE, 1);
+ SDL_GL_SetAttribute (SDL_GL_BLUE_SIZE, 1);
+ SDL_GL_SetAttribute (SDL_GL_DEPTH_SIZE, 1);
+
+ SDL_GL_SetAttribute (SDL_GL_STENCIL_SIZE,
+ config->need_stencil ? 1 : 0);
+
+ SDL_GL_SetAttribute (SDL_GL_DOUBLEBUFFER,
+ config->swap_chain->length > 1 ? 1 : 0);
+
+ SDL_GL_SetAttribute (SDL_GL_ALPHA_SIZE,
+ config->swap_chain->has_alpha ? 1 : 0);
+}
+
+static CoglBool
+_cogl_winsys_display_setup (CoglDisplay *display,
+ GError **error)
+{
+ CoglDisplaySdl2 *sdl_display;
+ const char * (* get_string_func) (GLenum name);
+ const char *gl_version;
+
+ _COGL_RETURN_VAL_IF_FAIL (display->winsys == NULL, FALSE);
+
+ sdl_display = g_slice_new0 (CoglDisplaySdl2);
+ display->winsys = sdl_display;
+
+ set_gl_attribs_from_framebuffer_config (&display->onscreen_template->config);
+
+ if (display->renderer->driver == COGL_DRIVER_GLES1)
+ SDL_GL_SetAttribute (SDL_GL_CONTEXT_MAJOR_VERSION, 1);
+ else if (display->renderer->driver == COGL_DRIVER_GLES2)
+ SDL_GL_SetAttribute (SDL_GL_CONTEXT_MAJOR_VERSION, 2);
+
+ /* Create a dummy 1x1 window that never gets display so that we can
+ * create a GL context */
+ sdl_display->dummy_window = SDL_CreateWindow ("",
+ 0, 0, /* x/y */
+ 1, 1, /* w/h */
+ SDL_WINDOW_OPENGL |
+ SDL_WINDOW_HIDDEN);
+ if (sdl_display->dummy_window == NULL)
+ {
+ g_set_error (error, COGL_WINSYS_ERROR,
+ COGL_WINSYS_ERROR_INIT,
+ "SDL_CreateWindow failed: %s",
+ SDL_GetError ());
+ goto error;
+ }
+
+ sdl_display->context = SDL_GL_CreateContext (sdl_display->dummy_window);
+
+ if (sdl_display->context == NULL)
+ {
+ g_set_error (error, COGL_WINSYS_ERROR,
+ COGL_WINSYS_ERROR_INIT,
+ "SDL_GL_CreateContext failed: %s",
+ SDL_GetError ());
+ goto error;
+ }
+
+ /* SDL doesn't seem to provide a way to select between GL and GLES
+ * and instead it will just pick one itself. We can at least try to
+ * verify that it picked the one we were expecting by looking at the
+ * GL version string */
+ get_string_func = SDL_GL_GetProcAddress ("glGetString");
+ gl_version = get_string_func (GL_VERSION);
+
+ switch (display->renderer->driver)
+ {
+ case COGL_DRIVER_GL:
+ /* The first character of the version string will be a digit if
+ * it's normal GL */
+ if (!g_ascii_isdigit (gl_version[0]))
+ {
+ g_set_error (error, COGL_WINSYS_ERROR,
+ COGL_WINSYS_ERROR_INIT,
+ "The GL driver was requested but SDL is using GLES");
+ goto error;
+ }
+ break;
+
+ case COGL_DRIVER_GLES2:
+ if (!g_str_has_prefix (gl_version, "OpenGL ES 2"))
+ {
+ g_set_error (error, COGL_WINSYS_ERROR,
+ COGL_WINSYS_ERROR_INIT,
+ "The GLES2 driver was requested but SDL is "
+ "not using GLES2");
+ goto error;
+ }
+ break;
+
+ case COGL_DRIVER_GLES1:
+ if (!g_str_has_prefix (gl_version, "OpenGL ES 1"))
+ {
+ g_set_error (error, COGL_WINSYS_ERROR,
+ COGL_WINSYS_ERROR_INIT,
+ "The GLES1 driver was requested but SDL is "
+ "not using GLES1");
+ goto error;
+ }
+ break;
+
+ default:
+ g_assert_not_reached ();
+ }
+
+ return TRUE;
+
+error:
+ _cogl_winsys_display_destroy (display);
+ return FALSE;
+}
+
+static CoglBool
+_cogl_winsys_context_init (CoglContext *context, GError **error)
+{
+ CoglRenderer *renderer = context->display->renderer;
+
+ context->winsys = g_new0 (CoglContextSdl2, 1);
+
+ if (G_UNLIKELY (renderer->sdl_event_type_set == FALSE))
+ g_error ("cogl_sdl_renderer_set_event_type() or cogl_sdl_context_new() "
+ "must be called during initialization");
+
+ if (!_cogl_context_update_features (context, error))
+ return FALSE;
+
+ if (SDL_GL_GetSwapInterval () != -1)
+ COGL_FLAGS_SET (context->winsys_features,
+ COGL_WINSYS_FEATURE_SWAP_REGION_THROTTLE,
+ TRUE);
+
+ return TRUE;
+}
+
+static void
+_cogl_winsys_context_deinit (CoglContext *context)
+{
+ g_free (context->winsys);
+}
+
+static void
+_cogl_winsys_onscreen_bind (CoglOnscreen *onscreen)
+{
+ CoglFramebuffer *fb = COGL_FRAMEBUFFER (onscreen);
+ CoglContext *context = fb->context;
+ CoglContextSdl2 *sdl_context = context->winsys;
+ CoglDisplaySdl2 *sdl_display = context->display->winsys;
+ CoglOnscreenSdl2 *sdl_onscreen = onscreen->winsys;
+
+ if (sdl_context->current_window == sdl_onscreen->window)
+ return;
+
+ SDL_GL_MakeCurrent (sdl_onscreen->window, sdl_display->context);
+
+ sdl_context->current_window = sdl_onscreen->window;
+
+ /* It looks like SDL just directly calls a glXSwapInterval function
+ * when this is called. This may be provided by either the EXT
+ * extension, the SGI extension or the Mesa extension. The SGI
+ * extension is per context so we can't just do this once when the
+ * framebuffer is allocated. See the comments in the GLX winsys for
+ * more info. */
+ if (COGL_FLAGS_GET (context->winsys_features,
+ COGL_WINSYS_FEATURE_SWAP_REGION_THROTTLE))
+ {
+ CoglFramebuffer *fb = COGL_FRAMEBUFFER (onscreen);
+
+ SDL_GL_SetSwapInterval (fb->config.swap_throttled ? 1 : 0);
+ }
+}
+
+static void
+_cogl_winsys_onscreen_deinit (CoglOnscreen *onscreen)
+{
+ CoglOnscreenSdl2 *sdl_onscreen = onscreen->winsys;
+
+ if (sdl_onscreen->window != NULL)
+ {
+ CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
+ CoglContextSdl2 *sdl_context = context->winsys;
+
+ if (sdl_context->current_window == sdl_onscreen->window)
+ sdl_context->current_window = NULL;
+
+ SDL_DestroyWindow (sdl_onscreen->window);
+ sdl_onscreen->window = NULL;
+ }
+
+ g_slice_free (CoglOnscreenSdl2, sdl_onscreen);
+ onscreen->winsys = NULL;
+}
+
+static CoglBool
+_cogl_winsys_onscreen_init (CoglOnscreen *onscreen,
+ GError **error)
+{
+ CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
+ CoglOnscreenSdl2 *sdl_onscreen;
+ SDL_Window *window;
+ int width, height;
+
+ width = cogl_framebuffer_get_width (framebuffer);
+ height = cogl_framebuffer_get_height (framebuffer);
+
+ window = SDL_CreateWindow ("" /* title */,
+ 0, 0, /* x/y */
+ width, height,
+ SDL_WINDOW_OPENGL |
+ SDL_WINDOW_HIDDEN);
+
+ if (window == NULL)
+ {
+ g_set_error (error, COGL_WINSYS_ERROR,
+ COGL_WINSYS_ERROR_CREATE_ONSCREEN,
+ "SDL_CreateWindow failed: %s",
+ SDL_GetError ());
+ return FALSE;
+ }
+
+ onscreen->winsys = g_slice_new (CoglOnscreenSdl2);
+ sdl_onscreen = onscreen->winsys;
+ sdl_onscreen->window = window;
+
+ return TRUE;
+}
+
+static void
+_cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
+{
+ CoglOnscreenSdl2 *sdl_onscreen = onscreen->winsys;
+
+ SDL_GL_SwapWindow (sdl_onscreen->window);
+}
+
+static void
+_cogl_winsys_onscreen_update_swap_throttled (CoglOnscreen *onscreen)
+{
+ CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
+ CoglContextSdl2 *sdl_context = context->winsys;
+ CoglOnscreenSdl2 *sdl_onscreen = onscreen->winsys;
+
+ if (sdl_context->current_window != sdl_onscreen->window)
+ return;
+
+ sdl_context->current_window = NULL;
+ _cogl_winsys_onscreen_bind (onscreen);
+}
+
+static void
+_cogl_winsys_onscreen_set_visibility (CoglOnscreen *onscreen,
+ CoglBool visibility)
+{
+ CoglOnscreenSdl2 *sdl_onscreen = onscreen->winsys;
+
+ if (visibility)
+ SDL_ShowWindow (sdl_onscreen->window);
+ else
+ SDL_HideWindow (sdl_onscreen->window);
+}
+
+const CoglWinsysVtable *
+_cogl_winsys_sdl_get_vtable (void)
+{
+ static CoglBool vtable_inited = FALSE;
+ static CoglWinsysVtable vtable;
+
+ /* It would be nice if we could use C99 struct initializers here
+ like the GLX backend does. However this code is more likely to be
+ compiled using Visual Studio which (still!) doesn't support them
+ so we initialize it in code instead */
+
+ if (!vtable_inited)
+ {
+ memset (&vtable, 0, sizeof (vtable));
+
+ vtable.id = COGL_WINSYS_ID_SDL;
+ vtable.name = "SDL";
+ vtable.renderer_get_proc_address = _cogl_winsys_renderer_get_proc_address;
+ vtable.renderer_connect = _cogl_winsys_renderer_connect;
+ vtable.renderer_disconnect = _cogl_winsys_renderer_disconnect;
+ vtable.display_setup = _cogl_winsys_display_setup;
+ vtable.display_destroy = _cogl_winsys_display_destroy;
+ vtable.context_init = _cogl_winsys_context_init;
+ vtable.context_deinit = _cogl_winsys_context_deinit;
+ vtable.onscreen_init = _cogl_winsys_onscreen_init;
+ vtable.onscreen_deinit = _cogl_winsys_onscreen_deinit;
+ vtable.onscreen_bind = _cogl_winsys_onscreen_bind;
+ vtable.onscreen_swap_buffers = _cogl_winsys_onscreen_swap_buffers;
+ vtable.onscreen_update_swap_throttled =
+ _cogl_winsys_onscreen_update_swap_throttled;
+ vtable.onscreen_set_visibility = _cogl_winsys_onscreen_set_visibility;
+
+ vtable_inited = TRUE;
+ }
+
+ return &vtable;
+}
diff --git a/configure.ac b/configure.ac
index 10f6f83..22c15a0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -748,6 +748,30 @@ AS_IF([test "x$enable_sdl" = "xyes"],
[SUPPORT_SDL=no])
AM_CONDITIONAL(SUPPORT_SDL, [test "x$SUPPORT_SDL" = "xyes"])
+AC_ARG_ENABLE(
+ [sdl2],
+ [AC_HELP_STRING([--enable-sdl2=@<:@no/yes@:>@], [Enable SDL2 support @<:@default=no@:>@])],
+ [],
+ [enable_sdl2=no])
+AS_IF([test "x$enable_sdl2" = "xyes"],
+ [
+ PKG_CHECK_MODULES([SDL2],
+ [sdl2],
+ [],
+ [AC_MSG_ERROR([SDL2 support requested but SDL2 not found])])
+
+ SUPPORT_SDL2=yes
+ GL_WINSYS_APIS="$GL_WINSYS_APIS sdl2"
+ COGL_PKG_REQUIRES="$COGL_PKG_REQUIRES sdl2"
+
+ COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_SDL_SUPPORT"
+ ],
+ [SUPPORT_SDL2=no])
+AM_CONDITIONAL(SUPPORT_SDL2, [test "x$SUPPORT_SDL2" = "xyes"])
+
+AS_IF([test "x$SUPPORT_SDL2" = "xyes" -a "x$SUPPORT_SDL" = "xyes"],
+ [AC_MSG_ERROR([The SDL1 and SDL2 winsyses are currently mutually exclusive])])
+
EGL_PLATFORM_COUNT=0
AC_ARG_ENABLE(
@@ -890,7 +914,7 @@ AC_ARG_ENABLE(
[xlib-egl-platform],
[AC_HELP_STRING([--enable-xlib-egl-platform=@<:@no/yes@:>@], [Enable support for the Xlib egl platform @<:@default=auto@:>@])],
[],
- AS_IF([test "x$enable_gles1" = "xyes" -o "x$enable_gles2" = "xyes" && test "x$SUPPORT_SDL_GLES" != "xyes" && test $EGL_PLATFORM_COUNT -eq 0],
+ AS_IF([test "x$enable_gles1" = "xyes" -o "x$enable_gles2" = "xyes" && test "x$SUPPORT_SDL_GLES" != "xyes" && test "x$SUPPORT_SDL2" != "xyes" && test $EGL_PLATFORM_COUNT -eq 0],
[enable_xlib_egl_platform=yes], [enable_xlib_egl_platform=no])
)
AS_IF([test "x$enable_xlib_egl_platform" = "xyes"],
diff --git a/examples/Makefile.am b/examples/Makefile.am
index cb29640..6145d22 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -63,6 +63,12 @@ cogl_sdl_hello_SOURCES = cogl-sdl-hello.c
cogl_sdl_hello_LDADD = $(common_ldadd)
endif
+if SUPPORT_SDL2
+programs += cogl-sdl2-hello
+cogl_sdl2_hello_SOURCES = cogl-sdl2-hello.c
+cogl_sdl2_hello_LDADD = $(common_ldadd)
+endif
+
cogl_gles2_context_SOURCES = cogl-gles2-context.c
cogl_gles2_context_LDADD = $(common_ldadd)
diff --git a/examples/cogl-sdl2-hello.c b/examples/cogl-sdl2-hello.c
new file mode 100644
index 0000000..f465771
--- /dev/null
+++ b/examples/cogl-sdl2-hello.c
@@ -0,0 +1,137 @@
+#include <cogl/cogl.h>
+#include <glib.h>
+#include <stdio.h>
+#include <SDL.h>
+
+/* This short example is just to demonstrate mixing SDL with Cogl as a
+ simple way to get portable support for events */
+
+typedef struct Data
+{
+ CoglPrimitive *triangle;
+ CoglPipeline *pipeline;
+ float center_x, center_y;
+ CoglFramebuffer *fb;
+ CoglBool quit;
+ CoglBool redraw_queued;
+} Data;
+
+static CoglBool
+redraw (Data *data)
+{
+ CoglFramebuffer *fb = data->fb;
+
+ cogl_framebuffer_clear4f (fb, COGL_BUFFER_BIT_COLOR, 0, 0, 0, 1);
+
+ cogl_framebuffer_push_matrix (fb);
+ cogl_framebuffer_translate (fb, data->center_x, -data->center_y, 0.0f);
+
+ cogl_framebuffer_draw_primitive (fb, data->pipeline, data->triangle);
+ cogl_framebuffer_pop_matrix (fb);
+
+ cogl_onscreen_swap_buffers (COGL_ONSCREEN (fb));
+
+ return FALSE;
+}
+
+static void
+handle_event (Data *data, SDL_Event *event)
+{
+ switch (event->type)
+ {
+ case SDL_WINDOWEVENT:
+ switch (event->window.event)
+ {
+ case SDL_WINDOWEVENT_EXPOSED:
+ data->redraw_queued = TRUE;
+ break;
+
+ case SDL_WINDOWEVENT_CLOSE:
+ data->quit = TRUE;
+ break;
+ }
+ break;
+
+ case SDL_MOUSEMOTION:
+ {
+ int width =
+ cogl_framebuffer_get_width (COGL_FRAMEBUFFER (data->fb));
+ int height =
+ cogl_framebuffer_get_height (COGL_FRAMEBUFFER (data->fb));
+
+ data->center_x = event->motion.x * 2.0f / width - 1.0f;
+ data->center_y = event->motion.y * 2.0f / height - 1.0f;
+
+ data->redraw_queued = TRUE;
+ }
+ break;
+
+ case SDL_QUIT:
+ data->quit = TRUE;
+ break;
+ }
+}
+
+int
+main (int argc, char **argv)
+{
+ CoglContext *ctx;
+ CoglOnscreen *onscreen;
+ GError *error = NULL;
+ CoglVertexP2C4 triangle_vertices[] = {
+ {0, 0.7, 0xff, 0x00, 0x00, 0x80},
+ {-0.7, -0.7, 0x00, 0xff, 0x00, 0xff},
+ {0.7, -0.7, 0x00, 0x00, 0xff, 0xff}
+ };
+ Data data;
+ SDL_Event event;
+
+ ctx = cogl_sdl_context_new (SDL_USEREVENT, &error);
+ if (!ctx)
+ {
+ fprintf (stderr, "Failed to create context: %s\n", error->message);
+ return 1;
+ }
+
+ onscreen = cogl_onscreen_new (ctx, 800, 600);
+ data.fb = COGL_FRAMEBUFFER (onscreen);
+
+ data.center_x = 0.0f;
+ data.center_y = 0.0f;
+ data.quit = FALSE;
+
+ cogl_onscreen_show (onscreen);
+
+ data.triangle = cogl_primitive_new_p2c4 (ctx, COGL_VERTICES_MODE_TRIANGLES,
+ 3, triangle_vertices);
+ data.pipeline = cogl_pipeline_new (ctx);
+
+ data.redraw_queued = TRUE;
+ while (!data.quit)
+ {
+ while (!data.quit)
+ {
+ if (!SDL_PollEvent (&event))
+ {
+ if (data.redraw_queued)
+ break;
+
+ cogl_sdl_idle (ctx);
+ if (!SDL_WaitEvent (&event))
+ {
+ fprintf (stderr, "Error waiting for SDL events");
+ return 1;
+ }
+ }
+
+ handle_event (&data, &event);
+ cogl_sdl_handle_event (ctx, &event);
+ }
+
+ data.redraw_queued = redraw (&data);
+ }
+
+ cogl_object_unref (ctx);
+
+ return 0;
+}
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