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egl.cpp
/*
* Copyright (c) 2014-2022, Nils Christopher Brause, Philipp Kerling, Zsolt Bölöny
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdexcept>
#include <iostream>
#include <array>
#include <cstdint>
#include <wayland-client.hpp>
#include <wayland-client-protocol-extra.hpp>
#include <wayland-egl.hpp>
#include <GL/gl.h>
#include <linux/input.h>
#include <wayland-cursor.hpp>
using namespace wayland;
// helper to create a std::function out of a member function and an object
template <typename R, typename T, typename... Args>
std::function<R(Args...)> bind_mem_fn(R(T::* func)(Args...), T *t)
{
return [func, t] (Args... args)
{
return (t->*func)(args...);
};
}
// example Wayland client
class example
{
private:
// global objects
display_t display;
registry_t registry;
compositor_t compositor;
shell_t shell;
xdg_wm_base_t xdg_wm_base;
seat_t seat;
shm_t shm;
// local objects
surface_t surface;
shell_surface_t shell_surface;
xdg_surface_t xdg_surface;
xdg_toplevel_t xdg_toplevel;
pointer_t pointer;
keyboard_t keyboard;
callback_t frame_cb;
cursor_image_t cursor_image;
buffer_t cursor_buffer;
surface_t cursor_surface;
// EGL
egl_window_t egl_window;
EGLDisplay egldisplay = nullptr;
EGLSurface eglsurface = nullptr;
EGLContext eglcontext = nullptr;
bool running;
bool has_pointer;
bool has_keyboard;
void init_egl()
{
egldisplay = eglGetDisplay(display);
if(egldisplay == EGL_NO_DISPLAY)
throw std::runtime_error("eglGetDisplay");
EGLint major = 0;
EGLint minor = 0;
if(eglInitialize(egldisplay, &major, &minor) == EGL_FALSE)
throw std::runtime_error("eglInitialize");
if(!((major == 1 && minor >= 4) || major >= 2))
throw std::runtime_error("EGL version too old");
if(eglBindAPI(EGL_OPENGL_API) == EGL_FALSE)
throw std::runtime_error("eglBindAPI");
std::array<EGLint, 13> config_attribs = {{
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_RED_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_ALPHA_SIZE, 8,
EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
EGL_NONE
}};
EGLConfig config = nullptr;
EGLint num = 0;
if(eglChooseConfig(egldisplay, config_attribs.data(), &config, 1, &num) == EGL_FALSE || num == 0)
throw std::runtime_error("eglChooseConfig");
std::array<EGLint, 3> context_attribs = {{
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
}};
eglcontext = eglCreateContext(egldisplay, config, EGL_NO_CONTEXT, context_attribs.data());
if(eglcontext == EGL_NO_CONTEXT)
throw std::runtime_error("eglCreateContext");
eglsurface = eglCreateWindowSurface(egldisplay, config, egl_window, nullptr);
if(eglsurface == EGL_NO_SURFACE)
throw std::runtime_error("eglCreateWindowSurface");
if(eglMakeCurrent(egldisplay, eglsurface, eglsurface, eglcontext) == EGL_FALSE)
throw std::runtime_error("eglMakeCurrent");
}
void draw(uint32_t serial = 0)
{
float h = static_cast<float>((serial >> 4) & 0xFF)/255.0F;
float s = 1;
float v = 1;
int hi = static_cast<int>(h*6);
float f = h*6 - static_cast<float>(hi);
float p = v*(1-s);
float q = v*(1-s*f);
float t = v*(1-s*(1-f));
float r = 0;
float g = 0;
float b = 0;
switch(hi)
{
case 1:
r = q; g = v; b = p;
break;
case 2:
r = p; g = v; b = t;
break;
case 3:
r = p; g = q; b = v;
break;
case 4:
r = t; g = p; b = v;
break;
case 5:
r = v; g = p; b = q;
break;
default: // 0,6
r = v; g = t; b = p;
break;
}
// draw stuff
glClearColor(r, g, b, 0.5F);
glClear(GL_COLOR_BUFFER_BIT);
// schedule next draw
frame_cb = surface.frame();
frame_cb.on_done() = bind_mem_fn(&example::draw, this);
// swap buffers
if(eglSwapBuffers(egldisplay, eglsurface) == EGL_FALSE)
throw std::runtime_error("eglSwapBuffers");
}
public:
example(const example&) = delete;
example(example&&) noexcept = delete;
example& operator=(const example&) = delete;
example& operator=(example&&) noexcept = delete;
example()
{
// retrieve global objects
registry = display.get_registry();
registry.on_global() = [&] (uint32_t name, const std::string& interface, uint32_t version)
{
if(interface == compositor_t::interface_name)
registry.bind(name, compositor, version);
else if(interface == shell_t::interface_name)
registry.bind(name, shell, version);
else if(interface == xdg_wm_base_t::interface_name)
registry.bind(name, xdg_wm_base, version);
else if(interface == seat_t::interface_name)
registry.bind(name, seat, version);
else if(interface == shm_t::interface_name)
registry.bind(name, shm, version);
};
display.roundtrip();
seat.on_capabilities() = [&] (const seat_capability& capability)
{
has_keyboard = capability & seat_capability::keyboard;
has_pointer = capability & seat_capability::pointer;
};
// create a surface
surface = compositor.create_surface();
// create a shell surface
if(xdg_wm_base)
{
xdg_wm_base.on_ping() = [&] (uint32_t serial) { xdg_wm_base.pong(serial); };
xdg_surface = xdg_wm_base.get_xdg_surface(surface);
xdg_surface.on_configure() = [&] (uint32_t serial) { xdg_surface.ack_configure(serial); };
xdg_toplevel = xdg_surface.get_toplevel();
xdg_toplevel.set_title("Window");
xdg_toplevel.on_close() = [&] () { running = false; };
}
else
{
shell_surface = shell.get_shell_surface(surface);
shell_surface.on_ping() = [&] (uint32_t serial) { shell_surface.pong(serial); };
shell_surface.set_title("Window");
shell_surface.set_toplevel();
}
surface.commit();
display.roundtrip();
// Get input devices
if(!has_keyboard)
throw std::runtime_error("No keyboard found.");
if(!has_pointer)
throw std::runtime_error("No pointer found.");
pointer = seat.get_pointer();
keyboard = seat.get_keyboard();
// load cursor theme
cursor_theme_t cursor_theme = cursor_theme_t("default", 16, shm);
cursor_t cursor = cursor_theme.get_cursor("cross");
cursor_image = cursor.image(0);
cursor_buffer = cursor_image.get_buffer();
// create cursor surface
cursor_surface = compositor.create_surface();
// draw cursor
pointer.on_enter() = [&] (uint32_t serial, const surface_t& /*unused*/, int32_t /*unused*/, int32_t /*unused*/)
{
cursor_surface.attach(cursor_buffer, 0, 0);
cursor_surface.damage(0, 0, cursor_image.width(), cursor_image.height());
cursor_surface.commit();
pointer.set_cursor(serial, cursor_surface, 0, 0);
};
// window movement
pointer.on_button() = [&] (uint32_t serial, uint32_t /*unused*/, uint32_t button, pointer_button_state state)
{
if(button == BTN_LEFT && state == pointer_button_state::pressed)
{
if(xdg_toplevel)
xdg_toplevel.move(seat, serial);
else
shell_surface.move(seat, serial);
}
};
// press 'q' to exit
keyboard.on_key() = [&] (uint32_t /*unused*/, uint32_t /*unused*/, uint32_t key, keyboard_key_state state)
{
if(key == KEY_Q && state == keyboard_key_state::pressed)
running = false;
};
// intitialize egl
egl_window = egl_window_t(surface, 320, 240);
init_egl();
// draw stuff
draw();
}
~example() noexcept
{
// finialize EGL
if(eglDestroyContext(egldisplay, eglcontext) == EGL_FALSE)
std::cerr << "eglDestroyContext failed.";
if(eglTerminate(egldisplay) == EGL_FALSE)
std::cerr << "eglTerminate failed.";
}
void run()
{
// event loop
running = true;
while(running)
display.dispatch();
}
};
int main()
{
example e;
e.run();
return 0;
}
wayland::seat_capability::keyboard
static const wayland::detail::bitfield< 3, 12 > keyboard
the seat has one or more keyboards
Definition wayland-client-protocol.hpp:2660
wayland::seat_capability::pointer
static const wayland::detail::bitfield< 3, 12 > pointer
the seat has pointer devices
Definition wayland-client-protocol.hpp:2658
wayland-client.hpp