A simple program using the mir library.
#define GLM_FORCE_RADIANS
#include <glm/gtc/matrix_transform.hpp>
#include <thread>
#include <atomic>
#include <chrono>
#include <csignal>
#include <iostream>
#include <sstream>
#include <vector>
namespace
{
std::atomic<bool> created{false};
static const float min_alpha = 0.3f;
char const* const surfaces_to_render = "surfaces-to-render";
{
if (!ctx)
BOOST_THROW_EXCEPTION(std::logic_error("Display does not support GL rendering"));
return ctx;
}
class StopWatch
{
public:
StopWatch() : start(std::chrono::high_resolution_clock::now()),
last(start),
now(last)
{
}
void stop()
{
now = std::chrono::high_resolution_clock::now();
}
double elapsed_seconds_since_start()
{
auto elapsed = now - start;
float elapsed_sec = std::chrono::duration_cast<std::chrono::microseconds>(elapsed).count() / 1000000.0f;
return elapsed_sec;
}
double elapsed_seconds_since_last_restart()
{
auto elapsed = now - last;
float elapsed_sec = std::chrono::duration_cast<std::chrono::microseconds>(elapsed).count() / 1000000.0f;
return elapsed_sec;
}
void restart()
{
std::swap(last, now);
}
private:
std::chrono::high_resolution_clock::time_point start;
std::chrono::high_resolution_clock::time_point last;
std::chrono::high_resolution_clock::time_point now;
};
class Moveable
{
public:
Moveable() {}
Moveable(std::shared_ptr<ms::Surface>
const& s,
const geom::Size& display_size,
float dx, float dy, const glm::vec3& rotation_axis, float alpha_offset)
: surface(s), display_size(display_size),
x(s->top_left().x.as_int()),
y(s->top_left().y.as_int()),
w(s->size().width.as_int()),
h(s->size().height.as_int()),
dx{dx},
dy{dy},
rotation_axis(rotation_axis),
alpha_offset{alpha_offset}
{
}
void step()
{
stop_watch.stop();
float elapsed_sec = stop_watch.elapsed_seconds_since_last_restart();
float total_elapsed_sec = stop_watch.elapsed_seconds_since_start();
stop_watch.restart();
bool should_update = true;
float new_x = x + elapsed_sec * dx;
float new_y = y + elapsed_sec * dy;
{
dx = -dx;
should_update = false;
}
{
dy = -dy;
should_update = false;
}
if (should_update)
{
surface->move_to({new_x, new_y});
x = new_x;
y = new_y;
}
glm::mat4 trans = glm::rotate(glm::mat4(1.0f),
glm::radians(total_elapsed_sec * 120.0f),
rotation_axis);
surface->set_transformation(trans);
float const alpha_amplitude = (1.0f - min_alpha) / 2.0f;
surface->set_alpha(min_alpha + alpha_amplitude +
alpha_amplitude *
sin(alpha_offset + 2 * M_PI * total_elapsed_sec /
3.0));
}
private:
std::shared_ptr<ms::Surface> surface;
float x;
float y;
float w;
float h;
float dx;
float dy;
StopWatch stop_watch;
glm::vec3 rotation_axis;
float alpha_offset;
};
void callback_when_started(
mir::Server& server, std::function<
void()> callback)
{
{
ServerStatusListener(std::function<void()> callback) :
callback(callback) {}
virtual void paused() override {}
virtual void resumed() override {}
virtual void started() override {callback(); callback = []{}; }
virtual void ready_for_user_input() override {}
virtual void stop_receiving_input() override {}
std::function<void()> callback;
};
{
return std::make_shared<ServerStatusListener>(callback);
});
}
{
public:
RenderSurfacesDisplayBufferCompositor(
std::unique_ptr<DisplayBufferCompositor> db_compositor,
std::vector<Moveable>& moveables)
: db_compositor{std::move(db_compositor)},
moveables(moveables),
frames{0}
{
}
{
while (!created) std::this_thread::yield();
stop_watch.stop();
if (stop_watch.elapsed_seconds_since_last_restart() >= 1)
{
std::cout << "FPS: " << frames << " Frame Time: " << 1.0 / frames << std::endl;
frames = 0;
stop_watch.restart();
}
db_compositor->composite(std::move(scene_sequence));
for (auto& m : moveables)
m.step();
frames++;
}
private:
std::unique_ptr<DisplayBufferCompositor> const db_compositor;
StopWatch stop_watch;
std::vector<Moveable>& moveables;
uint32_t frames;
};
{
public:
RenderSurfacesDisplayBufferCompositorFactory(
std::shared_ptr<mc::DisplayBufferCompositorFactory> const& factory,
std::vector<Moveable>& moveables)
: factory{factory},
moveables(moveables)
{
}
std::unique_ptr<mc::DisplayBufferCompositor> create_compositor_for(
mg::DisplayBuffer& display_buffer)
{
auto compositor = factory->create_compositor_for(display_buffer);
auto raw = new RenderSurfacesDisplayBufferCompositor(
std::move(compositor), moveables);
return std::unique_ptr<RenderSurfacesDisplayBufferCompositor>(raw);
}
private:
std::shared_ptr<mc::DisplayBufferCompositorFactory> const factory;
std::vector<Moveable>& moveables;
};
{
public:
RenderSurfacesServer(int argc, char const** argv)
{
wrap_display_buffer_compositor_factory([this](std::shared_ptr<mc::DisplayBufferCompositorFactory> const& wrapped)
{
return std::make_shared<RenderSurfacesDisplayBufferCompositorFactory>(
wrapped,
moveables);
});
add_configuration_option(surfaces_to_render, "Number of surfaces to render", 5);
set_command_line(argc, argv);
setenv("MIR_SERVER_NO_FILE", "", 1);
if (auto const socket = getenv("MIR_SOCKET"))
setenv("MIR_SERVER_HOST_SOCKET", socket, 0);
callback_when_started(*this, [this] { create_surfaces(); });
apply_settings();
}
void create_surfaces()
try
{
moveables.resize(get_options()->get<int>(surfaces_to_render));
std::cout << "Rendering " << moveables.size() << " surfaces" << std::endl;
auto const display = the_display();
auto const buffer_stream_factory = the_buffer_stream_factory();
auto const surface_factory = the_surface_factory();
auto const surface_stack = the_surface_stack();
auto const gl_context = as_context_source(the_display().get())->create_gl_context();
{
{
});
});
uint32_t const surface_side{300};
geom::Size const surface_size{surface_side, surface_side};
float const angular_step = 2.0 * M_PI / moveables.size();
float const h = display_size.height.as_uint32_t();
auto const surface_pf = supported_pixel_formats()[0];
int i = 0;
for (auto& m : moveables)
{
{
};
auto buffers = buffer_stream_factory->create_buffer_map(std::make_shared<NullBufferSink>());
auto const stream = buffer_stream_factory->create_buffer_stream({}, buffers, properties);
auto const surface = surface_factory->create_surface(
surface_stack->add_surface(surface, params.input_mode);
{
auto const complete = [&](
mg::Buffer* new_buf){ buffer = new_buf; };
surface->primary_buffer_stream()->swap_buffers(buffer, complete);
if (!buffer)
{
auto buffer_id = buffers->add_buffer(properties);
buffer = (*buffers)[buffer_id].get();
}
{
gl_context->make_current();
mir_image.bytes_per_pixel};
img_renderer.render();
gl_context->release_current();
}
surface->primary_buffer_stream()->swap_buffers(buffer, complete);
}
uint32_t const x = w * (0.5 + 0.25 * cos(i * angular_step)) - surface_side / 2.0;
uint32_t const y = h * (0.5 + 0.25 * sin(i * angular_step)) - surface_side / 2.0;
surface->move_to({x, y});
m = Moveable(surface, display_size,
cos(0.1f + i * M_PI / 6.0f) * w / 3.0f,
sin(0.1f + i * M_PI / 6.0f) * h / 3.0f,
glm::vec3{(i % 3 == 0) * 1.0f, (i % 3 == 1) * 1.0f, (i % 3 == 2) * 1.0f},
2.0f * M_PI * cos(i));
++i;
}
created = true;
}
catch (...)
{
exit(EXIT_FAILURE);
}
private:
std::vector<Moveable> moveables;
};
}
int main(
int argc,
char const** argv)
try
{
RenderSurfacesServer render_surfaces{argc, argv};
render_surfaces.run();
return render_surfaces.exited_normally() ? EXIT_SUCCESS : EXIT_FAILURE;
}
catch (...)
{
return EXIT_FAILURE;
}