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#define _POSIX_C_SOURCE 199309L
#define _XOPEN_SOURCE 500
#include <GLES2/gl2.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <wayland-server-protocol.h>
#include <wayland-server.h>
#include <wlr/backend.h>
#include <wlr/backend/session.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/types/wlr_box.h>
#include <wlr/types/wlr_matrix.h>
#include <wlr/types/wlr_output.h>
#include <wlr/types/wlr_tablet_pad.h>
#include <wlr/types/wlr_tablet_tool.h>
#include <wlr/util/log.h>
#include <xkbcommon/xkbcommon.h>
#include "support/cat.h"
#include "support/shared.h"
struct sample_state {
struct wlr_renderer *renderer;
bool proximity, tap, button;
double distance;
double pressure;
double x, y;
double x_tilt, y_tilt;
double width_mm, height_mm;
double ring;
struct wl_list link;
float tool_color[4];
float pad_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_output_make_current(wlr_output, NULL);
wlr_renderer_begin(sample->renderer, wlr_output->width, wlr_output->height);
wlr_renderer_clear(sample->renderer, (float[]){0.25f, 0.25f, 0.25f, 1});
float distance = 0.8f * (1 - sample->distance);
float tool_color[4] = { distance, distance, distance, 1 };
for (size_t i = 0; sample->button && 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;
const struct wlr_box box = {
.x = left, .y = top,
.width = pad_width, .height = pad_height,
};
wlr_render_rect(sample->renderer, &box, sample->pad_color,
wlr_output->transform_matrix);
if (sample->proximity) {
struct wlr_box box = {
.x = (sample->x * pad_width) - 8 * (sample->pressure + 1) + left,
.y = (sample->y * pad_height) - 8 * (sample->pressure + 1) + top,
.width = 16 * (sample->pressure + 1),
.height = 16 * (sample->pressure + 1),
};
float matrix[9];
wlr_matrix_project_box(matrix, &box, WL_OUTPUT_TRANSFORM_NORMAL,
sample->ring, wlr_output->transform_matrix);
wlr_render_quad_with_matrix(sample->renderer, tool_color, matrix);
box.x += sample->x_tilt;
box.y += sample->y_tilt;
box.width /= 2;
box.height /= 2;
wlr_render_rect(sample->renderer, &box, tool_color,
wlr_output->transform_matrix);
}
wlr_renderer_end(sample->renderer);
wlr_output_swap_buffers(wlr_output, NULL, NULL);
}
static void handle_tool_axis(struct tablet_tool_state *tstate,
struct wlr_event_tablet_tool_axis *event) {
struct sample_state *sample = tstate->compositor->data;
if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_X)) {
sample->x = event->x;
}
if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_Y)) {
sample->y = event->y;
}
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;
}
if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_TILT_X)) {
sample->x_tilt = event->tilt_x;
}
if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_TILT_Y)) {
sample->y_tilt = event->tilt_y;
}
}
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) {
sample->button = false;
} else {
sample->button = true;
for (size_t i = 0; i < 3; ++i) {
if (button % 3 == i) {
sample->tool_color[i] = 0;
} else {
sample->tool_color[i] = 1;
}
}
}
}
static void handle_pad_button(struct tablet_pad_state *pstate,
uint32_t button, enum wlr_button_state state) {
struct sample_state *sample = pstate->compositor->data;
float default_color[4] = { 0.5, 0.5, 0.5, 1.0 };
if (state == WLR_BUTTON_RELEASED) {
memcpy(sample->pad_color, default_color, sizeof(default_color));
} else {
for (size_t i = 0; i < 3; ++i) {
if (button % 3 == i) {
sample->pad_color[i] = 0;
} else {
sample->pad_color[i] = 1;
}
}
}
}
static void handle_pad_ring(struct tablet_pad_state *pstate,
uint32_t ring, double position) {
struct sample_state *sample = pstate->compositor->data;
if (position != -1) {
sample->ring = -(position * (M_PI / 180.0));
}
}
static void handle_input_add(struct compositor_state *cstate,
struct wlr_input_device *inputdev) {
struct sample_state *sample = cstate->data;
if (inputdev->type == WLR_INPUT_DEVICE_TABLET_TOOL) {
sample->width_mm = inputdev->width_mm == 0 ?
20 : inputdev->width_mm;
sample->height_mm = inputdev->height_mm == 0 ?
10 : inputdev->height_mm;
}
}
int main(int argc, char *argv[]) {
wlr_log_init(L_DEBUG, NULL);
struct sample_state state = {
.tool_color = { 1, 1, 1, 1 },
.pad_color = { 0.5, 0.5, 0.5, 1.0 }
};
struct compositor_state compositor = {
.data = &state,
.output_frame_cb = handle_output_frame,
.tool_axis_cb = handle_tool_axis,
.tool_proximity_cb = handle_tool_proximity,
.tool_button_cb = handle_tool_button,
.pad_button_cb = handle_pad_button,
.pad_ring_cb = handle_pad_ring,
.input_add_cb = handle_input_add,
0
};
compositor_init(&compositor);
state.renderer = wlr_backend_get_renderer(compositor.backend);
if (!state.renderer) {
wlr_log(L_ERROR, "Could not start compositor, OOM");
exit(EXIT_FAILURE);
}
if (!wlr_backend_start(compositor.backend)) {
wlr_log(L_ERROR, "Failed to start backend");
wlr_backend_destroy(compositor.backend);
exit(1);
}
wl_display_run(compositor.display);
wlr_renderer_destroy(state.renderer);
compositor_fini(&compositor);
}
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