static cg_filter_return_t
sdl_window_event_filter(SDL_WindowEvent *event,
cg_device_t *dev)
{
SDL_Window *window;
cg_framebuffer_t *framebuffer;
window = SDL_GetWindowFromID(event->windowID);
if (window == NULL)
return CG_FILTER_CONTINUE;
framebuffer = SDL_GetWindowData(window, CG_SDL_WINDOW_DATA_KEY);
if (framebuffer == NULL || framebuffer->dev != dev)
return CG_FILTER_CONTINUE;
if (event->event == SDL_WINDOWEVENT_SIZE_CHANGED) {
cg_display_t *display = dev->display;
cg_renderer_t *renderer = display->renderer;
cg_renderer_sdl2_t *sdl_renderer = renderer->winsys;
float width = event->data1;
float height = event->data2;
cg_onscreen_sdl2_t *sdl_onscreen;
_cg_framebuffer_winsys_update_size(framebuffer, width, height);
/* We only want to notify that a resize happened when the
* application calls cg_device_dispatch so instead of
* immediately notifying we queue an idle callback */
if (!sdl_renderer->resize_notify_idle) {
sdl_renderer->resize_notify_idle = _cg_loop_add_idle(
renderer,
flush_pending_resize_notifications_idle,
dev,
NULL);
}
sdl_onscreen = CG_ONSCREEN(framebuffer)->winsys;
sdl_onscreen->pending_resize_notify = true;
} else if (event->event == SDL_WINDOWEVENT_EXPOSED) {
cg_onscreen_dirty_info_t info;
/* Sadly SDL doesn't seem to report the rectangle of the expose
* event so we'll just queue the whole window */
info.x = 0;
info.y = 0;
info.width = framebuffer->width;
info.height = framebuffer->height;
_cg_onscreen_queue_dirty(CG_ONSCREEN(framebuffer), &info);
}
return CG_FILTER_CONTINUE;
}
static bool
_cg_winsys_set_gles2_context(cg_gles2_context_t *gles2_ctx,
cg_error_t **error)
{
cg_device_t *dev = gles2_ctx->dev;
cg_display_egl_t *egl_display = dev->display->winsys;
bool status;
if (gles2_ctx->write_buffer && cg_is_onscreen(gles2_ctx->write_buffer))
status = bind_onscreen_with_context(
CG_ONSCREEN(gles2_ctx->write_buffer), gles2_ctx->winsys);
else
status = _cg_winsys_egl_make_current(dev->display,
egl_display->dummy_surface,
egl_display->dummy_surface,
gles2_ctx->winsys);
if (!status) {
_cg_set_error(error,
CG_WINSYS_ERROR,
CG_WINSYS_ERROR_MAKE_CURRENT,
"Failed to make gles2 context current");
return false;
}
return true;
}
static void
paint_cb(uv_idle_t *idle)
{
Data *data = idle->data;
cg_error_t *error = NULL;
const cg_gles2_vtable_t *gles2 = data->gles2_vtable;
/* Draw scene with GLES2 */
if (!cg_push_gles2_context(
data->dev, data->gles2_ctx, data->fb, data->fb, &error)) {
c_error("Failed to push gles2 context: %s\n", error->message);
}
/* Clear offscreen framebuffer with a random color */
gles2->glClearColor(
c_random_double(), c_random_double(), c_random_double(), 1.0f);
gles2->glClear(GL_COLOR_BUFFER_BIT);
cg_pop_gles2_context(data->dev);
/* Draw scene with Cogl */
cg_primitive_draw(data->triangle, data->fb, data->pipeline);
cg_onscreen_swap_buffers(CG_ONSCREEN(data->fb));
uv_idle_stop(&data->idle);
}
static cg_onscreen_t *
find_onscreen_for_xid(cg_device_t *dev, uint32_t xid)
{
c_llist_t *l;
for (l = dev->framebuffers; l; l = l->next) {
cg_framebuffer_t *framebuffer = l->data;
cg_onscreen_egl_t *egl_onscreen;
cg_onscreen_xlib_t *xlib_onscreen;
if (!framebuffer->type == CG_FRAMEBUFFER_TYPE_ONSCREEN)
continue;
egl_onscreen = CG_ONSCREEN(framebuffer)->winsys;
xlib_onscreen = egl_onscreen->platform;
if (xlib_onscreen->xwin == (Window)xid)
return CG_ONSCREEN(framebuffer);
}
return NULL;
}
static void
flush_pending_notifications_cb(void *data, void *user_data)
{
cg_framebuffer_t *framebuffer = data;
if (framebuffer->type == CG_FRAMEBUFFER_TYPE_ONSCREEN) {
cg_onscreen_t *onscreen = CG_ONSCREEN(framebuffer);
cg_onscreen_sdl2_t *sdl_onscreen = onscreen->winsys;
if (sdl_onscreen->pending_resize_notify) {
_cg_onscreen_notify_resize(onscreen);
sdl_onscreen->pending_resize_notify = false;
}
}
}
static void
redraw(Data *data)
{
cg_framebuffer_t *fb = data->fb;
cg_framebuffer_clear4f(fb, CG_BUFFER_BIT_COLOR, 0, 0, 0, 1);
cg_framebuffer_push_matrix(fb);
cg_framebuffer_translate(fb, data->center_x, -data->center_y, 0.0f);
cg_primitive_draw(data->triangle, fb, data->pipeline);
cg_framebuffer_pop_matrix(fb);
cg_onscreen_swap_buffers(CG_ONSCREEN(fb));
}
int
main(int argc, char **argv)
{
Data data;
cg_onscreen_t *onscreen;
cg_error_t *error = NULL;
cg_vertex_p2c4_t triangle_vertices[] = {
{ 0, 0.7, 0xff, 0x00, 0x00, 0xff },
{ -0.7, -0.7, 0x00, 0xff, 0x00, 0xff },
{ 0.7, -0.7, 0x00, 0x00, 0xff, 0xff }
};
cg_renderer_t *renderer;
cg_display_t *display;
uv_loop_t *loop = uv_default_loop();
renderer = cg_renderer_new();
cg_renderer_add_constraint(renderer,
CG_RENDERER_CONSTRAINT_SUPPORTS_CG_GLES2);
if (!cg_renderer_connect(renderer, &error)) {
c_error("%s", error->message);
exit(1);
}
display = cg_display_new(renderer, NULL);
data.dev = cg_device_new();
cg_device_set_display(data.dev, display);
if (!cg_device_connect(data.dev, &error)) {
c_error("%s", error->message);
exit(1);
}
onscreen = cg_onscreen_new(data.dev, 640, 480);
cg_onscreen_show(onscreen);
data.fb = onscreen;
/* Prepare onscreen primitive */
data.triangle = cg_primitive_new_p2c4(
data.dev, CG_VERTICES_MODE_TRIANGLES, 3, triangle_vertices);
data.pipeline = cg_pipeline_new(data.dev);
data.offscreen_texture = cg_texture_2d_new_with_size(
data.dev, OFFSCREEN_WIDTH, OFFSCREEN_HEIGHT);
data.offscreen = cg_offscreen_new_with_texture(data.offscreen_texture);
data.gles2_ctx = cg_gles2_context_new(data.dev, &error);
if (!data.gles2_ctx) {
c_error("Failed to create GLES2 context: %s\n", error->message);
}
data.gles2_vtable = cg_gles2_context_get_vtable(data.gles2_ctx);
/* Draw scene with GLES2 */
if (!cg_push_gles2_context(
data.dev, data.gles2_ctx, data.fb, data.fb, &error)) {
c_error("Failed to push gles2 context: %s\n", error->message);
}
cg_pop_gles2_context(data.dev);
cg_onscreen_add_frame_callback(
CG_ONSCREEN(data.fb), frame_event_cb, &data, NULL); /* destroy notify */
uv_idle_init(loop, &data.idle);
data.idle.data = &data;
uv_idle_start(&data.idle, paint_cb);
cg_uv_set_mainloop(data.dev, loop);
uv_run(loop, UV_RUN_DEFAULT);
return 0;
}