Add tablet example

1 files changed, 86 insertions, 6 deletions

diff --git a/example/tablet.c b/example/tablet.c
index 9a498438..f2497d59 100644
--- a/example/tablet.c
+++ b/example/tablet.c
@@ -21,6 +21,13 @@
 
 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) {
@@ -28,13 +35,41 @@ static void handle_output_frame(struct output_state *output, struct timespec *ts
 	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];
-	float color[4] = { 0, 1.0, 0, 1.0 };
-	wlr_matrix_scale(&matrix, 128, 128, 1);
-	wlr_matrix_mul(&wlr_output->transform_matrix, &matrix, &matrix);
-	wlr_render_colored_ellipse(sample->renderer, &color, &matrix);
+	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);
 }
@@ -46,13 +81,58 @@ static void handle_keyboard_key(struct keyboard_state *kbstate,
 	}
 }
 
+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 = { 0 };
+	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();