first_frame wip

4 files changed, 38 insertions, 10 deletions

diff --git a/floormat/main.hpp b/floormat/main.hpp
index 8239a05a..59039152 100644
--- a/floormat/main.hpp
+++ b/floormat/main.hpp
@@ -98,6 +98,7 @@ protected:
     Vector2 _dpi_scale{ 1, 1 }, _virtual_scale{ 1, 1 };
     Vector2i _framebuffer_size;
     bool _do_render_vobjs : 1 = true;
+    bool _first_frame : 1 = true;
 };
 
 } // namespace floormat
diff --git a/main/ctor.cpp b/main/ctor.cpp
index 402e7db0..35968535 100644
--- a/main/ctor.cpp
+++ b/main/ctor.cpp
@@ -30,6 +30,7 @@ class world& main_impl::reset_world(class world&& w) noexcept
 {
     arrayResize(_clickable_scenery, 0);
     _world = move(w);
+    _first_frame = true;
     return _world;
 }
 
diff --git a/main/draw.cpp b/main/draw.cpp
index 42cf4082..e5fb9e69 100644
--- a/main/draw.cpp
+++ b/main/draw.cpp
@@ -16,15 +16,14 @@ namespace floormat {
 namespace {
 
 size_t bad_frame_counter = 0; // NOLINT
+constexpr auto clear_color = 0x222222ff_rgbaf;
 
 } // namespace
 
-
-void main_impl::do_update()
+void main_impl::do_update(const Ns& dtʹ)
 {
     constexpr auto eps = 1e-5f;
     constexpr auto max_dt = Milliseconds*100;
-    const auto dtʹ = timeline.update();
     const auto dt = dtʹ > max_dt ? max_dt : dtʹ;
     if (float secs{Time::to_seconds(dt)}; secs > eps)
     {
@@ -45,22 +44,47 @@ void main_impl::do_update()
     app.update(dt);
 }
 
-void main_impl::drawEvent()
+void main_impl::clear_framebuffer()
 {
-    _shader.set_tint({1, 1, 1, 1});
-
-    constexpr auto clear_color = 0x222222ff_rgbaf;
 #ifdef FM_USE_DEPTH32
     framebuffer.fb.clearColor(0, clear_color);
 #else
     GL::defaultFramebuffer.clearColor(clear_color);
 #endif
+}
+
+void main_impl::cache_draw_on_startup()
+{
+    _shader.set_tint({1, 1, 1, 1});
+    clear_framebuffer();
+    for (int i = 0; i < 3; i++)
+    {
+        do_update(Ns{1});
+        draw_world();
+    }
+    clear_framebuffer();
+    (void)timeline.update();
+    swapBuffers();
+    redraw();
+}
+
+void main_impl::drawEvent()
+{
+    if (_first_frame) [[unlikely]]
+    {
+        _first_frame = false;
+        cache_draw_on_startup();
+    }
+
+    _shader.set_tint({1, 1, 1, 1});
+
+    clear_framebuffer();
     draw_world();
 
     app.draw();
     GL::Renderer::flush();
 
-    do_update();
+    do_update(timeline.update());
 
 #ifdef FM_USE_DEPTH32
     GL::Framebuffer::blit(framebuffer.fb, GL::defaultFramebuffer, framebuffer.fb.viewport(), GL::FramebufferBlit::Color);
diff --git a/main/main-impl.hpp b/main/main-impl.hpp
index 66f143d1..9d3eef43 100644
--- a/main/main-impl.hpp
+++ b/main/main-impl.hpp
@@ -85,10 +85,12 @@ struct main_impl final : Platform::Sdl2Application, floormat_main
     [[maybe_unused]] void keyPressEvent(KeyEvent& event) override;
     [[maybe_unused]] void keyReleaseEvent(KeyEvent& event) override;
     [[maybe_unused]] void anyEvent(SDL_Event& event) override;
-    
+
+    void cache_draw_on_startup();
+    void clear_framebuffer();
     void drawEvent() override;
     void bind() noexcept override;
-    void do_update();
+    void do_update(const Ns& dt);
     struct meshes meshes() noexcept override;
 
     bool is_text_input_active() const noexcept override;