Merge branch 'libinput' into wayland-backend

1 files changed, 143 insertions, 0 deletions

diff --git a/example/tablet.c b/example/tablet.c
new file mode 100644
index 00000000..f2497d59
--- /dev/null
+++ b/example/tablet.c
@@ -0,0 +1,143 @@
+#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;
+	bool proximity, tap;
+	double distance;
+	double pressure;
+	double x_mm, y_mm;
+	double width_mm, height_mm;
+	struct wl_list link;
+	float tool_color[4];
+};
+
+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], view[16];
+	float pad_color[4] = { 0.75, 0.75, 0.75, 1.0 };
+	float distance = 0.8f * (1 - sample->distance);
+	float tool_color[4] = { distance, distance, distance, 1 };
+	for (size_t i = 0; i < 4; ++i) {
+		tool_color[i] *= sample->tool_color[i];
+	}
+	float scale = 4;
+
+	float pad_width = sample->width_mm * scale;
+	float pad_height = sample->height_mm * scale;
+	float left = width / 2.0f - pad_width / 2.0f;
+	float top = height / 2.0f - pad_height / 2.0f;
+	wlr_matrix_translate(&matrix, left, top, 0);
+	wlr_matrix_scale(&view, pad_width, pad_height, 1);
+	wlr_matrix_mul(&matrix, &view, &view);
+	wlr_matrix_mul(&wlr_output->transform_matrix, &view, &matrix);
+	wlr_render_colored_quad(sample->renderer, &pad_color, &matrix);
+
+	if (sample->proximity) {
+		wlr_matrix_translate(&matrix,
+				sample->x_mm * scale - 8 * (sample->pressure + 1) + left,
+				sample->y_mm * scale - 8 * (sample->pressure + 1) + top, 0);
+		wlr_matrix_scale(&view,
+				16 * (sample->pressure + 1),
+				16 * (sample->pressure + 1), 1);
+		wlr_matrix_mul(&matrix, &view, &view);
+		wlr_matrix_mul(&wlr_output->transform_matrix, &view, &matrix);
+		wlr_render_colored_ellipse(sample->renderer, &tool_color, &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_tool_axis(struct tablet_tool_state *tstate,
+			struct wlr_tablet_tool_axis *event) {
+	struct sample_state *sample = tstate->compositor->data;
+	sample->width_mm = event->width_mm;
+	sample->height_mm = event->height_mm;
+	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_X)) {
+		sample->x_mm = event->x_mm;
+	}
+	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_Y)) {
+		sample->y_mm = event->y_mm;
+	}
+	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_DISTANCE)) {
+		sample->distance = event->distance;
+	}
+	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_PRESSURE)) {
+		sample->pressure = event->pressure;
+	}
+}
+
+static void handle_tool_proximity(struct tablet_tool_state *tstate,
+		enum wlr_tablet_tool_proximity_state state) {
+	struct sample_state *sample = tstate->compositor->data;
+	sample->proximity = state == WLR_TABLET_TOOL_PROXIMITY_IN;
+}
+
+static void handle_tool_button(struct tablet_tool_state *tstate,
+		uint32_t button, enum wlr_button_state state) {
+	struct sample_state *sample = tstate->compositor->data;
+	if (state == WLR_BUTTON_RELEASED) {
+		float default_color[4] = { 1, 1, 1, 1 };
+		memcpy(sample->tool_color, default_color, 4);
+	} else {
+		for (size_t i = 0; i < 3; ++i) {
+			if (button % 3 != i) {
+				sample->tool_color[button % 3] = 0;
+			}
+		}
+	}
+}
+
+int main(int argc, char *argv[]) {
+	struct sample_state state = {
+		.tool_color = { 1, 1, 1, 1 }
+	};
+	struct compositor_state compositor;
+
+	compositor_init(&compositor);
+	compositor.output_frame_cb = handle_output_frame;
+	compositor.keyboard_key_cb = handle_keyboard_key;
+	compositor.tool_axis_cb = handle_tool_axis;
+	compositor.tool_proximity_cb = handle_tool_proximity;
+	compositor.tool_button_cb = handle_tool_button;
+
+	state.renderer = wlr_gles3_renderer_init();
+
+	compositor.data = &state;
+	compositor_run(&compositor);
+
+	wlr_renderer_destroy(state.renderer);
+}