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#include "main-impl.hpp"
#include "floormat/app.hpp"
#include "src/camera-offset.hpp"
#include <Magnum/GL/DefaultFramebuffer.h>
#include <algorithm>
#include <thread>
//#define FM_SKIP_MSAA
namespace floormat {
void main_impl::recalc_viewport(Vector2i size) noexcept
{
update_window_state();
_shader.set_scale(Vector2{size});
GL::defaultFramebuffer.setViewport({{}, size });
if (_msaa_color.id())
_msaa_framebuffer.detach(GL::Framebuffer::ColorAttachment{0});
if (_msaa_depth.id())
_msaa_framebuffer.detach(GL::Framebuffer::BufferAttachment::DepthStencil);
if (_msaa_framebuffer.id())
_msaa_framebuffer.setViewport({{}, size});
else
_msaa_framebuffer = GL::Framebuffer{{{}, size}};
// --- color ---
_msaa_color = Magnum::GL::Renderbuffer{};
const int samples = std::min(_msaa_color.maxSamples(), (int)s.msaa_samples);
_msaa_color.setStorageMultisample(samples, GL::RenderbufferFormat::RGBA8, size);
_msaa_framebuffer.attachRenderbuffer(GL::Framebuffer::ColorAttachment{0}, _msaa_color);
// --- depth ---
_msaa_depth = Magnum::GL::Renderbuffer{};
_msaa_depth.setStorageMultisample(samples, GL::RenderbufferFormat::DepthStencil, size);
_msaa_framebuffer.attachRenderbuffer(GL::Framebuffer::BufferAttachment::DepthStencil, _msaa_depth);
// -- state ---
using R = GL::Renderer;
GL::Renderer::setBlendEquation(R::BlendEquation::Add, R::BlendEquation::Add);
GL::Renderer::setBlendFunction(R::BlendFunction::SourceAlpha, R::BlendFunction::OneMinusSourceAlpha);
GL::Renderer::disable(R::Feature::FaceCulling);
GL::Renderer::disable(R::Feature::DepthTest);
GL::Renderer::enable(R::Feature::Blending);
GL::Renderer::enable(R::Feature::ScissorTest);
GL::Renderer::setDepthFunction(R::DepthFunction::Greater);
GL::Renderer::setScissor({{}, size});
// -- user--
app.on_viewport_event(size);
}
global_coords main_impl::pixel_to_tile(Vector2d position) const noexcept
{
constexpr Vector2d pixel_size(TILE_SIZE2);
constexpr Vector2d half{.5, .5};
const Vector2d px = position - Vector2d{windowSize()}*.5 - _shader.camera_offset()*.5;
const Vector2d vec = tile_shader::unproject(px) / pixel_size + half;
const auto x = (std::int32_t)std::floor(vec[0]), y = (std::int32_t)std::floor(vec[1]);
return { x, y };
}
auto main_impl::get_draw_bounds() const noexcept -> draw_bounds
{
using limits = std::numeric_limits<std::int16_t>;
auto x0 = limits::max(), x1 = limits::min(), y0 = limits::max(), y1 = limits::min();
for (const auto win = Vector2d(windowSize());
auto p : {pixel_to_tile(Vector2d{0, 0}).chunk(),
pixel_to_tile(Vector2d{win[0]-1, 0}).chunk(),
pixel_to_tile(Vector2d{0, win[1]-1}).chunk(),
pixel_to_tile(Vector2d{win[0]-1, win[1]-1}).chunk()})
{
x0 = std::min(x0, p.x);
x1 = std::max(x1, p.x);
y0 = std::min(y0, p.y);
y1 = std::max(y1, p.y);
}
return {x0, x1, y0, y1};
}
void main_impl::draw_world() noexcept
{
auto [minx, maxx, miny, maxy] = get_draw_bounds();
const auto sz = windowSize();
for (std::int16_t y = miny; y <= maxy; y++)
for (std::int16_t x = minx; x <= maxx; x++)
{
const chunk_coords pos{x, y};
if (!_world.contains(pos))
app.maybe_initialize_chunk(pos, _world[pos]);
const with_shifted_camera_offset o{_shader, pos};
if (check_chunk_visible(_shader.camera_offset(), sz))
_floor_mesh.draw(_shader, _world[pos]);
}
GL::Renderer::enable(GL::Renderer::Feature::DepthTest);
constexpr float clear_depth = 0;
#ifdef FM_SKIP_MSAA
GL::defaultFramebuffer.clearDepthStencil(clear_depth, 0);
#else
_msaa_framebuffer.clearDepthStencil(clear_depth, 0);
#endif
for (std::int16_t y = miny; y <= maxy; y++)
for (std::int16_t x = minx; x <= maxx; x++)
{
const chunk_coords pos{x, y};
auto& c = _world[pos];
const with_shifted_camera_offset o{_shader, pos};
if (check_chunk_visible(_shader.camera_offset(), sz))
{
_wall_mesh.draw(_shader, c);
_anim_mesh.draw(_shader, c);
}
}
GL::Renderer::disable(GL::Renderer::Feature::DepthTest);
}
bool main_impl::check_chunk_visible(const Vector2d& offset, const Vector2i& size) noexcept
{
constexpr Vector3d len = dTILE_SIZE * TILE_MAX_DIM20d;
enum : std::size_t { x, y, };
constexpr Vector2d p00 = tile_shader::project(Vector3d(0, 0, 0)),
p10 = tile_shader::project(Vector3d(len[x], 0, 0)),
p01 = tile_shader::project(Vector3d(0, len[y], 0)),
p11 = tile_shader::project(Vector3d(len[x], len[y], 0));
constexpr auto xx = std::minmax({ p00[x], p10[x], p01[x], p11[x], }), yy = std::minmax({ p00[y], p10[y], p01[y], p11[y], });
constexpr auto minx = xx.first, maxx = xx.second, miny = yy.first, maxy = yy.second;
constexpr int W = (int)(maxx - minx + .5 + 1e-16), H = (int)(maxy - miny + .5 + 1e-16);
const auto X = (int)(minx + (offset[x] + size[x])*.5), Y = (int)(miny + (offset[y] + size[y])*.5);
return X + W > 0 && X < size[x] && Y + H > 0 && Y < size[y];
}
void main_impl::do_update()
{
float dt = timeline.previousFrameDuration();
if (dt > 0)
{
const float RC1 = dt_expected.do_sleep ? 1.f : 1.f/5, RC2 = 1.f/10;
const float alpha1 = dt/(dt + RC1);
const float alpha2 = dt/(dt + RC2);
_frame_time1 = _frame_time1*(1-alpha1) + alpha1*dt;
_frame_time2 = _frame_time1*(1-alpha2) + alpha2*dt;
constexpr float max_deviation = 5 * 1e-3f;
if (std::fabs(_frame_time1 - _frame_time2) > max_deviation)
_frame_time1 = _frame_time2;
}
else
{
swapBuffers();
timeline.nextFrame();
}
dt = std::clamp(dt, 1e-5f, std::fmaxf(1e-1f, dt_expected.value));
app.update(dt);
}
void main_impl::drawEvent()
{
do_update();
_shader.set_tint({1, 1, 1, 1});
{
using namespace Math::Literals;
const auto clear_color = 0x222222ff_rgbaf;
#ifdef FM_SKIP_MSAA
GL::defaultFramebuffer.clearColor(clear_color);
#else
_msaa_framebuffer.clearColor(0, clear_color);
_msaa_framebuffer.bind();
#endif
draw_world();
app.draw_msaa();
#ifndef FM_SKIP_MSAA
GL::defaultFramebuffer.bind();
using Blit = GL::FramebufferBlit;
constexpr auto blit_mask = Blit::Color /* | Blit::Depth | Blit::Stencil */;
GL::Framebuffer::blit(_msaa_framebuffer, GL::defaultFramebuffer, {{}, windowSize()}, blit_mask);
#endif
}
app.draw();
swapBuffers();
redraw();
if (dt_expected.do_sleep)
{
constexpr float ε = 1e-3f;
const float Δt൦ = timeline.currentFrameDuration(), sleep_secs = dt_expected.value - Δt൦ - dt_expected.jitter;
if (sleep_secs > ε)
std::this_thread::sleep_for(std::chrono::nanoseconds((long long)(sleep_secs * 1e9f)));
//fm_debug("jitter:%.1f sleep:%.0f", dt_expected.jitter*1000, sleep_secs*1000);
const float Δt = timeline.currentFrameDuration() - dt_expected.value;
constexpr float α = .1f;
dt_expected.jitter = std::fmax(dt_expected.jitter + Δt * α,
dt_expected.jitter * (1-α) + Δt * α);
dt_expected.jitter = std::copysign(std::fmin(dt_expected.value, std::fabs(dt_expected.jitter)), dt_expected.jitter);
}
else
dt_expected.jitter = 0;
timeline.nextFrame();
}
} // namespace floormat
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