Add pointer example

example/CMakeLists.txt

@@ -27,3 +27,16 @@ target_link_libraries(rotation
     wlr-render
     ${XKBCOMMON_LIBRARIES}
 )
+
+add_executable(pointer
+    pointer.c
+    shared.c
+    cat.c
+)
+
+target_link_libraries(pointer
+    wlr-backend
+    wlr-session
+    wlr-render
+    ${XKBCOMMON_LIBRARIES}
+)

example/pointer.c

@@ -0,0 +1,77 @@
+#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 <wayland-server.h>
+#include <wayland-server-protocol.h>
+#include <xkbcommon/xkbcommon.h>
+#include <GLES3/gl3.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 <math.h>
+#include "shared.h"
+#include "cat.h"
+
+struct sample_state {
+	struct wlr_renderer *renderer;
+	struct wlr_surface *cat_texture;
+	int cur_x, cur_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;
+
+	wlr_renderer_begin(sample->renderer, wlr_output);
+
+	float matrix[16];
+	wlr_surface_get_matrix(sample->cat_texture, &matrix,
+		&wlr_output->transform_matrix, sample->cur_x, sample->cur_y);
+	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_pointer_motion(struct pointer_state *pstate,
+		double d_x, double d_y) {
+	struct sample_state *state = pstate->compositor->data;
+	state->cur_x += d_x;
+	state->cur_y += d_y;
+}
+
+int main(int argc, char *argv[]) {
+	struct sample_state state = { 0 };
+	struct compositor_state compositor;
+
+	compositor_init(&compositor);
+	compositor.output_frame_cb = handle_output_frame;
+	compositor.pointer_motion_cb = handle_pointer_motion;
+	compositor.keyboard_key_cb = handle_keyboard_key;
+
+	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);
+}

example/shared.c

@@ -35,12 +35,7 @@ static void keyboard_key_notify(struct wl_listener *listener, void *data) {
 		event->state == WLR_KEY_PRESSED ?  XKB_KEY_DOWN : XKB_KEY_UP);
 }
 
-static void input_add_notify(struct wl_listener *listener, void *data) {
-	struct wlr_input_device *device = data;
-	struct compositor_state *state = wl_container_of(listener, state, input_add);
-	if (device->type != WLR_INPUT_DEVICE_KEYBOARD) {
-		return;
-	}
+static void keyboard_add(struct wlr_input_device *device, struct compositor_state *state) {
 	struct keyboard_state *kbstate = calloc(sizeof(struct keyboard_state), 1);
 	kbstate->device = device;
 	kbstate->compositor = state;
@@ -75,26 +70,90 @@ static void input_add_notify(struct wl_listener *listener, void *data) {
 	}
 }
 
-static void input_remove_notify(struct wl_listener *listener, void *data) {
+static void pointer_motion_notify(struct wl_listener *listener, void *data) {
+	struct wlr_pointer_motion *event = data;
+	struct pointer_state *pstate = wl_container_of(listener, pstate, motion);
+	if (pstate->compositor->pointer_motion_cb) {
+		pstate->compositor->pointer_motion_cb(pstate, event->delta_x, event->delta_y);
+	}
+}
+
+static void pointer_add(struct wlr_input_device *device, struct compositor_state *state) {
+	struct pointer_state *pstate = calloc(sizeof(struct pointer_state), 1);
+	pstate->device = device;
+	pstate->compositor = state;
+	wl_list_init(&pstate->motion.link);
+	wl_list_init(&pstate->motion_absolute.link);
+	wl_list_init(&pstate->button.link);
+	wl_list_init(&pstate->axis.link);
+	pstate->motion.notify = pointer_motion_notify;
+	wl_signal_add(&device->pointer->events.motion, &pstate->motion);
+	wl_list_insert(&state->pointers, &pstate->link);
+}
+
+static void input_add_notify(struct wl_listener *listener, void *data) {
 	struct wlr_input_device *device = data;
 	struct compositor_state *state = wl_container_of(listener, state, input_add);
-	if (device->type != WLR_INPUT_DEVICE_KEYBOARD) {
-		return;
+	switch (device->type) {
+	case WLR_INPUT_DEVICE_KEYBOARD:
+		keyboard_add(device, state);
+		break;
+	case WLR_INPUT_DEVICE_POINTER:
+		pointer_add(device, state);
+		break;
+	default:
+		break;
 	}
+}
+
+static void keyboard_remove(struct wlr_input_device *device, struct compositor_state *state) {
 	struct keyboard_state *kbstate = NULL, *_kbstate;
 	wl_list_for_each(_kbstate, &state->keyboards, link) {
 		if (_kbstate->device == device) {
-			kbstate = kbstate;
+			kbstate = _kbstate;
 			break;
 		}
 	}
 	if (!kbstate) {
-		return; // We are unfamiliar with this keyboard
+		return;
 	}
 	wl_list_remove(&kbstate->link);
 	wl_list_remove(&kbstate->key.link);
 }
 
+static void pointer_remove(struct wlr_input_device *device, struct compositor_state *state) {
+	struct pointer_state *pstate = NULL, *_pstate;
+	wl_list_for_each(_pstate, &state->pointers, link) {
+		if (_pstate->device == device) {
+			pstate = _pstate;
+			break;
+		}
+	}
+	if (!pstate) {
+		return;
+	}
+	wl_list_remove(&pstate->link);
+	//wl_list_remove(&pstate->motion.link);
+	wl_list_remove(&pstate->motion_absolute.link);
+	//wl_list_remove(&pstate->button.link);
+	//wl_list_remove(&pstate->axis.link);
+}
+
+static void input_remove_notify(struct wl_listener *listener, void *data) {
+	struct wlr_input_device *device = data;
+	struct compositor_state *state = wl_container_of(listener, state, input_add);
+	switch (device->type) {
+	case WLR_INPUT_DEVICE_KEYBOARD:
+		keyboard_remove(device, state);
+		break;
+	case WLR_INPUT_DEVICE_POINTER:
+		pointer_remove(device, state);
+		break;
+	default:
+		break;
+	}
+}
+
 static void output_frame_notify(struct wl_listener *listener, void *data) {
 	struct output_state *output = wl_container_of(listener, output, frame);
 	struct compositor_state *compositor = output->compositor;
@@ -162,6 +221,7 @@ void compositor_init(struct compositor_state *state) {
 	}
 
 	wl_list_init(&state->keyboards);
+	wl_list_init(&state->pointers);
 	wl_list_init(&state->input_add.link);
 	state->input_add.notify = input_add_notify;
 	wl_list_init(&state->input_remove.link);

example/shared.h

@@ -28,6 +28,17 @@ struct keyboard_state {
 	void *data;
 };
 
+struct pointer_state {
+	struct compositor_state *compositor;
+	struct wlr_input_device *device;
+	struct wl_listener motion;
+	struct wl_listener motion_absolute;
+	struct wl_listener button;
+	struct wl_listener axis;
+	struct wl_list link;
+	void *data;
+};
+
 struct compositor_state {
 	void (*output_add_cb)(struct output_state *s);
 	void (*keyboard_add_cb)(struct keyboard_state *s);
@@ -36,6 +47,7 @@ struct compositor_state {
 	void (*keyboard_remove_cb)(struct keyboard_state *s);
 	void (*keyboard_key_cb)(struct keyboard_state *s, xkb_keysym_t sym,
 			enum wlr_key_state key_state);
+	void (*pointer_motion_cb)(struct pointer_state *s, double d_x, double d_y);
 
 	struct wl_display *display;
 	struct wl_event_loop *event_loop;
@@ -43,6 +55,7 @@ struct compositor_state {
 	struct wlr_session *session;
 
 	struct wl_list keyboards;
+	struct wl_list pointers;
 	struct wl_listener input_add;
 	struct wl_listener input_remove;