Flesh out touch events and add demo

1 files changed, 122 insertions, 0 deletions

diff --git a/example/touch.c b/example/touch.c
new file mode 100644
index 00000000..7f4f3800
--- /dev/null
+++ b/example/touch.c
@@ -0,0 +1,122 @@
+#define _POSIX_C_SOURCE 199309L
+#define _XOPEN_SOURCE 500
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <math.h>
+#include <wayland-server.h>
+#include <wayland-server-protocol.h>
+#include <xkbcommon/xkbcommon.h>
+#include <GLES3/gl3.h>
+#include <wlr/common/list.h>
+#include <wlr/render/matrix.h>
+#include <wlr/render/gles3.h>
+#include <wlr/render.h>
+#include <wlr/backend.h>
+#include <wlr/session.h>
+#include <wlr/types.h>
+#include "shared.h"
+#include "cat.h"
+
+struct sample_state {
+	struct wlr_renderer *renderer;
+	struct wlr_surface *cat_texture;
+	list_t *touch_points;
+};
+
+struct touch_point {
+	int32_t slot;
+	double x, y;
+};
+
+static void handle_output_frame(struct output_state *output, struct timespec *ts) {
+	struct compositor_state *state = output->compositor;
+	struct sample_state *sample = state->data;
+	struct wlr_output *wlr_output = output->output;
+
+	int32_t width, height;
+	wlr_output_effective_resolution(wlr_output, &width, &height);
+	wlr_renderer_begin(sample->renderer, wlr_output);
+
+	float matrix[16];
+	for (size_t i = 0; i < sample->touch_points->length; ++i) {
+		struct touch_point *p = sample->touch_points->items[i];
+		wlr_surface_get_matrix(sample->cat_texture, &matrix,
+			&wlr_output->transform_matrix,
+			(int)(p->x * width) - sample->cat_texture->width / 2,
+			(int)(p->y * height) - sample->cat_texture->height / 2);
+		wlr_render_with_matrix(sample->renderer,
+				sample->cat_texture, &matrix);
+	}
+
+	wlr_renderer_end(sample->renderer);
+}
+
+static void handle_keyboard_key(struct keyboard_state *kbstate,
+		xkb_keysym_t sym, enum wlr_key_state key_state) {
+	if (sym == XKB_KEY_Escape) {
+		kbstate->compositor->exit = true;
+	}
+}
+
+static void handle_touch_down(struct touch_state *tstate, int32_t slot,
+		double x, double y, double width, double height) {
+	struct sample_state *sample = tstate->compositor->data;
+	struct touch_point *point = calloc(1, sizeof(struct touch_state));
+	point->slot = slot;
+	point->x = x / width;
+	point->y = y / height;
+	list_add(sample->touch_points, point);
+}
+
+static void handle_touch_up(struct touch_state *tstate, int32_t slot) {
+	struct sample_state *sample = tstate->compositor->data;
+	for (size_t i = 0; i < sample->touch_points->length; ++i) {
+		struct touch_point *point = sample->touch_points->items[i];
+		if (point->slot == slot) {
+			list_del(sample->touch_points, i);
+			break;
+		}
+	}
+}
+
+static void handle_touch_motion(struct touch_state *tstate, int32_t slot,
+		double x, double y, double width, double height) {
+	struct sample_state *sample = tstate->compositor->data;
+	for (size_t i = 0; i < sample->touch_points->length; ++i) {
+		struct touch_point *point = sample->touch_points->items[i];
+		if (point->slot == slot) {
+			point->x = x / width;
+			point->y = y / height;
+			break;
+		}
+	}
+}
+
+int main(int argc, char *argv[]) {
+	struct sample_state state = {
+		.touch_points = list_create()
+	};
+	struct compositor_state compositor;
+
+	compositor_init(&compositor);
+	compositor.output_frame_cb = handle_output_frame;
+	compositor.keyboard_key_cb = handle_keyboard_key;
+	compositor.touch_down_cb = handle_touch_down;
+	compositor.touch_up_cb = handle_touch_up;
+	compositor.touch_motion_cb = handle_touch_motion;
+
+	state.renderer = wlr_gles3_renderer_init();
+	state.cat_texture = wlr_render_surface_init(state.renderer);
+	wlr_surface_attach_pixels(state.cat_texture, GL_RGB,
+		cat_tex.width, cat_tex.height, cat_tex.pixel_data);
+
+	compositor.data = &state;
+	compositor_run(&compositor);
+
+	wlr_surface_destroy(state.cat_texture);
+	wlr_renderer_destroy(state.renderer);
+}