add cairo-egl-surface demo

1 files changed, 278 insertions, 0 deletions

diff --git a/cairo-egl-wayland-window-surface.c b/cairo-egl-wayland-window-surface.c
new file mode 100644
index 0000000..6e446d0
--- /dev/null
+++ b/cairo-egl-wayland-window-surface.c
@@ -0,0 +1,278 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <stdbool.h>
+#include <assert.h>
+
+#include <wayland-client.h>
+#include <wayland-egl.h>
+
+#include <EGL/egl.h>
+
+#include <cairo.h>
+#include <cairo-gl.h>
+
+struct display {
+	struct wl_display *display;
+	struct wl_egl_display *egl_display;
+	struct {
+		struct wl_compositor *compositor;
+		struct wl_shell *shell;
+	} interface;
+
+	struct {
+		EGLDisplay dpy;
+		EGLConfig  conf;
+		EGLContext ctx;
+	} egl;
+	cairo_device_t *cairo_device;
+
+	uint32_t mask;
+};
+
+struct window {
+	struct display *display;
+	struct wl_surface *surface;
+	struct wl_egl_window *egl_window;
+
+	int width, height;
+
+	struct {
+		EGLSurface surf;
+	} egl;
+	cairo_surface_t *cairo_surface;
+};
+
+static void
+init_egl(struct display *display)
+{
+	EGLint major, minor;
+	EGLint num_config;
+	EGLint config_attribs[] = {
+		EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
+		EGL_RED_SIZE, 1,
+		EGL_GREEN_SIZE, 1,
+		EGL_BLUE_SIZE, 1,
+		EGL_DEPTH_SIZE, 1,
+		EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
+		EGL_NONE
+	};
+
+	display->egl.dpy = eglGetDisplay(display->egl_display);
+	assert(display->egl.dpy);
+
+	assert(eglInitialize(display->egl.dpy, &major, &minor));
+
+	assert(eglBindAPI(EGL_OPENGL_API));
+   	assert(eglChooseConfig(display->egl.dpy, config_attribs,
+				 &display->egl.conf, 1, &num_config));
+	assert(num_config == 1);
+
+	display->egl.ctx = eglCreateContext(display->egl.dpy, display->egl.conf,
+					    EGL_NO_CONTEXT, NULL);
+	assert(display->egl.ctx);
+
+	display->cairo_device = cairo_egl_device_create(display->egl.dpy,
+							display->egl.ctx);
+	assert(display->cairo_device);
+}
+
+static const cairo_user_data_key_t surface_data_key;
+
+static void
+egl_window_surface_data_destroy(void *p)
+{
+	struct window *window = p;
+	struct display *d = window->display;
+
+	eglDestroySurface(d->egl.dpy, window->egl.surf);
+	wl_egl_window_destroy(window->egl_window);
+}
+
+static void
+create_cairo_window_surface(struct display *display, struct window *window)
+{
+	struct wl_visual *visual;	
+
+	visual = wl_display_get_premultiplied_argb_visual(display->display);
+	window->egl_window = wl_egl_window_create(display->egl_display,
+						  window->surface,
+						  window->width,
+						  window->height,
+						  visual);
+
+	window->egl.surf =
+		eglCreateWindowSurface(display->egl.dpy, display->egl.conf,
+				       window->egl_window,
+				       NULL);
+
+	window->cairo_surface =
+		cairo_gl_surface_create_for_egl(display->cairo_device,
+						window->egl.surf,
+						window->width,
+						window->height);
+
+	cairo_surface_set_user_data(window->cairo_surface, &surface_data_key,
+				    window, egl_window_surface_data_destroy);
+
+}
+
+static void
+redraw(void *data, uint32_t time)
+{
+	struct window *window = data;
+	cairo_t *cr;
+	cairo_pattern_t *pattern;
+	int x,y;
+	int width = window->width;
+	int height = window->height;
+
+	cr = cairo_create(window->cairo_surface);
+
+	int speed_div = 100;
+
+	double pos = time % (speed_div * 360) * 1.0 / speed_div;
+#if 0
+	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+	cairo_set_source_rgba(cr, 1, 1, 1, 1);
+	cairo_paint(cr);
+
+	/* Quadrate im Hintergrund zeichnen */
+	for (x=0; x<10; x++)
+		for (y=0; y<10; y++)
+			cairo_rectangle(cr, x*10.0, y*10.0, 5, 5);
+	pattern = cairo_pattern_create_radial(50, 50, 5, 50, 50, 50);
+	cairo_pattern_add_color_stop_rgb(pattern, 0, 0.75, 0.15, 0.99);
+	cairo_pattern_add_color_stop_rgb(pattern, 0.9, 1, 1, 1);
+
+	cairo_set_source(cr, pattern);
+#else
+	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+	cairo_set_source_rgba(cr, 0, 0, 0, 0);
+	cairo_paint(cr);
+
+	cairo_set_line_width(cr, 9);
+
+	cairo_set_source_rgb(cr, 0.69, 0.19, 0);
+	cairo_arc(cr, width/2, height/2, 
+			(width < height ? width : height) / 2 - 10, pos, pos+M_PI);
+	cairo_stroke_preserve(cr);
+
+	cairo_set_source_rgb(cr, 0.3, 0.4, 0.6); 
+#endif
+	cairo_fill(cr);
+	cairo_destroy(cr);
+
+	cairo_gl_surface_swapbuffers(window->cairo_surface);
+
+	wl_display_frame_callback(window->display->display, redraw, window);
+}
+
+enum window_location {
+	WINDOW_INTERIOR = 0,
+	WINDOW_RESIZING_TOP = 1,
+	WINDOW_RESIZING_BOTTOM = 2,
+	WINDOW_RESIZING_LEFT = 4,
+	WINDOW_RESIZING_TOP_LEFT = 5,
+	WINDOW_RESIZING_BOTTOM_LEFT = 6,
+	WINDOW_RESIZING_RIGHT = 8,
+	WINDOW_RESIZING_TOP_RIGHT = 9,
+	WINDOW_RESIZING_BOTTOM_RIGHT = 10,
+	WINDOW_RESIZING_MASK = 15,
+	WINDOW_EXTERIOR = 16,
+	WINDOW_TITLEBAR = 17,
+	WINDOW_CLIENT_AREA = 18,
+};
+
+static void
+handle_configure(void *data, struct wl_shell *shell,
+		 uint32_t time, uint32_t edges,
+		 struct wl_surface *surface,
+		 int32_t width, int32_t height)
+{
+	struct window *window = wl_surface_get_user_data(surface);
+	int dx = 0;
+	int dy = 0;
+	int a_width, a_height;
+
+	wl_egl_window_get_attached_size(window->egl_window,
+					&a_width, &a_height);
+
+	if (edges & WINDOW_RESIZING_LEFT)
+		dx = a_width - width;
+
+	if (edges & WINDOW_RESIZING_TOP)
+		dy = a_height - height;
+
+	wl_egl_window_resize(window->egl_window, width, height, dx, dy);
+	cairo_gl_surface_set_size(window->cairo_surface, width, height);
+
+	window->width = width;
+	window->height = height;
+}
+
+static const struct wl_shell_listener wayland_shell_listener = {
+	handle_configure,
+};
+
+static void
+display_handle_global(struct wl_display *display, uint32_t id,
+		      const char *interface, uint32_t version, void *data)
+{
+	struct display *d = data;
+
+	if (strcmp(interface, "compositor") == 0) {
+		d->interface.compositor = wl_compositor_create(display, id);
+	} else if (strcmp(interface, "shell") == 0) {
+		d->interface.shell = wl_shell_create(display, id);
+		wl_shell_add_listener(d->interface.shell, &wayland_shell_listener, d);
+	}
+}
+
+static int
+event_mask_update(uint32_t mask, void *data)
+{
+	struct display *d = data;
+
+	d->mask = mask;
+
+	return 0;
+}
+
+int
+main(int argc, char **argv)
+{
+	struct display display = { 0 };
+	struct window  window  = { 0 };
+
+	window.display = &display;
+	window.width  = 100;
+	window.height = 100;
+
+	display.display = wl_display_connect(NULL);
+	assert(display.display);
+
+	display.egl_display = wl_egl_display_create(display.display);
+	assert(display.egl_display);
+
+	wl_display_add_global_listener(display.display,
+				       display_handle_global, &display);
+	/* process connection events */
+	wl_display_iterate(display.display, WL_DISPLAY_READABLE);
+
+	init_egl(&display);
+	window.surface =
+		wl_compositor_create_surface(display.interface.compositor);
+	wl_surface_set_user_data(window.surface, &window);
+	create_cairo_window_surface(&display, &window);
+
+	wl_surface_map_toplevel(window.surface);
+
+	wl_display_frame_callback(display.display, redraw, &window);
+	
+	wl_display_get_fd(display.display, event_mask_update, &display);
+	while (true)
+		wl_display_iterate(display.display, display.mask);
+
+	return 0;
+}