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safe sleep CPU in idle

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This commit is contained in:
Matvey Cherevko
2018-11-08 11:53:50 +07:00
parent f12d7e8e22
commit e5e355c825
5 changed files with 45 additions and 39 deletions
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21
headers/enduro2d/utils/time.hpp
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@@ -181,24 +181,27 @@ namespace e2d { namespace time
namespace e2d { namespace time
{
template < typename TimeTag >
unit<i64, TimeTag> now() noexcept {
template < typename TimeTag, typename T = i64 >
unit<T, TimeTag> now() noexcept {
namespace ch = std::chrono;
const auto n = ch::high_resolution_clock::now();
const auto m = ch::time_point_cast<ch::microseconds>(n);
const auto c = m.time_since_epoch().count();
return make_microseconds(c).cast_to<i64>().convert_to<TimeTag>();
return make_microseconds(c).cast_to<T>().template convert_to<TimeTag>();
}
inline unit<i64, seconds_tag> now_s() noexcept {
return now<seconds_tag>();
template < typename T = i64 >
unit<T, seconds_tag> now_s() noexcept {
return now<seconds_tag, T>();
}
inline unit<i64, milliseconds_tag> now_ms() noexcept {
return now<milliseconds_tag>();
template < typename T = i64 >
inline unit<T, milliseconds_tag> now_ms() noexcept {
return now<milliseconds_tag, T>();
}
inline unit<i64, microseconds_tag> now_us() noexcept {
return now<microseconds_tag>();
template < typename T = i64 >
unit<T, microseconds_tag> now_us() noexcept {
return now<microseconds_tag, T>();
}
}}

15
samples/sources/sample_00/sample_00.cpp
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@@ -26,7 +26,7 @@ namespace
v_color = a_color;
v_uv = a_uv;
float s = 0.7 + 0.3 * (cos(u_time * 0.003) + 1);
float s = 0.7 + 0.3 * (cos(u_time * 3.0) + 1.0);
gl_Position = vec4(a_position * s, 1.0) * u_MVP;
}
)glsl";
@@ -42,7 +42,7 @@ namespace
void main(){
vec2 uv = vec2(v_uv.s, 1.0 - v_uv.t);
if ( u_time > 2000 ) {
if ( u_time > 2.0 ) {
gl_FragColor = v_color * texture2D(u_texture2, uv);
} else {
gl_FragColor = v_color * texture2D(u_texture1, uv);
@@ -158,22 +158,22 @@ namespace
.add_vertices(vertex_buffer1_)
.add_vertices(vertex_buffer2_);
begin_game_time_ = time::now_ms();
return true;
}
bool frame_tick() final {
the<window>().set_title(strings::rformat("FPS: %0", the<engine>().frame_rate()));
const keyboard& k = the<input>().keyboard();
if ( the<window>().should_close() || k.is_key_just_released(keyboard_key::escape) ) {
return false;
}
const auto game_time = (time::now_ms() - begin_game_time_).cast_to<f32>().value;
const auto framebuffer_size = the<window>().real_size().cast_to<f32>();
const auto projection = math::make_orthogonal_lh_matrix4(framebuffer_size, 0.f, 1.f);
material_.properties()
.property("u_time", game_time)
.property("u_time", the<engine>().time())
.property("u_MVP", projection);
the<render>().execute(render::command_block<64>()
@@ -193,12 +193,13 @@ namespace
vertex_buffer_ptr vertex_buffer2_;
render::material material_;
render::geometry geometry_;
milliseconds<i64> begin_game_time_;
};
}
int e2d_main() {
auto params = engine::parameters("sample_00", "enduro2d");
auto params = engine::parameters("sample_00", "enduro2d")
.timer_params(engine::timer_parameters()
.maximal_framerate(100));
modules::initialize<engine>(params).start<game>();
return 0;
}

14
samples/sources/sample_01/sample_01.cpp
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@@ -214,7 +214,6 @@ namespace
.add_vertices(vertex_buffer1_)
.add_vertices(vertex_buffer2_);
begin_game_time_ = time::now_ms();
return true;
}
@@ -224,7 +223,6 @@ namespace
return false;
}
const auto game_time = (time::now_ms() - begin_game_time_).cast_to<f32>().value;
const auto framebuffer_size = the<window>().real_size().cast_to<f32>();
const auto projection = math::make_perspective_lh_matrix4(
make_deg(45.f),
@@ -233,15 +231,14 @@ namespace
100.f);
const auto MVP =
math::make_rotation_matrix4(make_rad(game_time) * 0.001f, 1.f, 0.f, 0.f) *
math::make_rotation_matrix4(make_rad(game_time) * 0.001f, 0.f, 1.f, 0.f) *
math::make_rotation_matrix4(make_rad(game_time) * 0.001f, 0.f, 0.f, 1.f) *
math::make_rotation_matrix4(make_rad(the<engine>().time()), 1.f, 0.f, 0.f) *
math::make_rotation_matrix4(make_rad(the<engine>().time()), 0.f, 1.f, 0.f) *
math::make_rotation_matrix4(make_rad(the<engine>().time()), 0.f, 0.f, 1.f) *
math::make_translation_matrix4(0.f, 0.f, 0.f) *
math::make_loot_at_lh_matrix4({0.f,0.f,-3.f}, v3f::zero(), v3f::unit_y()) *
projection;
material_.properties()
.property("u_time", game_time)
.property("u_MVP", MVP);
the<render>().execute(render::command_block<64>()
@@ -260,12 +257,13 @@ namespace
vertex_buffer_ptr vertex_buffer2_;
render::material material_;
render::geometry geometry_;
milliseconds<i64> begin_game_time_;
};
}
int e2d_main() {
auto params = engine::parameters("sample_01", "enduro2d");
auto params = engine::parameters("sample_01", "enduro2d")
.timer_params(engine::timer_parameters()
.maximal_framerate(100));
modules::initialize<engine>(params).start<game>();
return 0;
}

14
samples/sources/sample_02/sample_02.cpp
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@@ -184,7 +184,6 @@ namespace
.indices(index_buffer_)
.add_vertices(vertex_buffer_);
begin_game_time_ = time::now_ms();
return true;
}
@@ -194,7 +193,6 @@ namespace
return false;
}
const auto game_time = (time::now_ms() - begin_game_time_).cast_to<f32>().value;
const auto framebuffer_size = the<window>().real_size().cast_to<f32>();
const auto projection = math::make_perspective_lh_matrix4(
make_deg(45.f),
@@ -203,15 +201,14 @@ namespace
100.f);
const auto MVP =
math::make_rotation_matrix4(make_rad(game_time) * 0.001f, 1.f, 0.f, 0.f) *
math::make_rotation_matrix4(make_rad(game_time) * 0.001f, 0.f, 1.f, 0.f) *
math::make_rotation_matrix4(make_rad(game_time) * 0.001f, 0.f, 0.f, 1.f) *
math::make_rotation_matrix4(make_rad(the<engine>().time()), 1.f, 0.f, 0.f) *
math::make_rotation_matrix4(make_rad(the<engine>().time()), 0.f, 1.f, 0.f) *
math::make_rotation_matrix4(make_rad(the<engine>().time()), 0.f, 0.f, 1.f) *
math::make_translation_matrix4(0.f, 0.f, 0.f) *
math::make_loot_at_lh_matrix4({0.f,0.f,-2.f}, v3f::zero(), v3f::unit_y()) *
projection;
material_.properties()
.property("u_time", game_time)
.property("u_MVP", MVP);
the<render>().execute(render::command_block<64>()
@@ -241,12 +238,13 @@ namespace
render::property_block tex_props_;
render::material material_;
render::geometry geometry_;
milliseconds<i64> begin_game_time_;
};
}
int e2d_main() {
auto params = engine::parameters("sample_02", "enduro2d");
auto params = engine::parameters("sample_02", "enduro2d")
.timer_params(engine::timer_parameters()
.maximal_framerate(100));
modules::initialize<engine>(params).start<game>();
return 0;
}

20
sources/enduro2d/core/engine.cpp
View File

@@ -246,7 +246,7 @@ namespace e2d
}
f32 realtime_time() const noexcept {
const auto delta_us = time::now_us().cast_to<u64>() - init_time_;
const auto delta_us = time::now_us<u64>() - init_time_;
return time::to_seconds(delta_us.cast_to<f32>()).value;
}
public:
@@ -261,10 +261,16 @@ namespace e2d
second_us / math::numeric_cast<u64>(math::clamp(
timer_params_.minimal_framerate(), 1u, 1000u));
auto now_us = time::now_us().cast_to<u64>();
auto now_us = time::now_us<u64>();
while ( now_us - prev_frame_time_ < minimal_delta_time_us ) {
std::this_thread::yield();
now_us = time::now_us().cast_to<u64>();
const auto sleep_us = minimal_delta_time_us - (now_us - prev_frame_time_);
const auto microsecond = make_microseconds<u64>(1000u);
if ( sleep_us > microsecond ) {
std::this_thread::sleep_for(time::to_chrono(sleep_us - microsecond));
} else {
std::this_thread::yield();
}
now_us = time::now_us<u64>();
}
delta_time_us_.store(math::minimized(
@@ -283,9 +289,9 @@ namespace e2d
}
private:
timer_parameters timer_params_;
microseconds<u64> init_time_{time::now_us().cast_to<u64>()};
microseconds<u64> prev_frame_time_{time::now_us().cast_to<u64>()};
microseconds<u64> prev_frame_rate_time_{time::now_us().cast_to<u64>()};
microseconds<u64> init_time_{time::now_us<u64>()};
microseconds<u64> prev_frame_time_{time::now_us<u64>()};
microseconds<u64> prev_frame_rate_time_{time::now_us<u64>()};
std::atomic<u64> time_us_{0};
std::atomic<u64> delta_time_us_{0};
std::atomic<u32> frame_rate_{0};