From cec7813e76aef77f51762e66d1c56184ca8f4e0b Mon Sep 17 00:00:00 2001
From: Stephen Seo <seo.disparate@gmail.com>
Date: Sun, 13 Apr 2025 13:52:52 +0900
Subject: [PATCH] Attempted OpenGL calls to fix flickering on mobile

---
 src/main.cc           | 4 ++++
 src/screen.cc         | 9 +++++++++
 src/screen_trunner.cc | 9 +++++++++
 3 files changed, 22 insertions(+)

diff --git a/src/main.cc b/src/main.cc
index 5dfb1e5..6c82a44 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -16,6 +16,8 @@
 
 #ifdef __EMSCRIPTEN__
 
+//#include <GLES2/gl2.h>
+
 Game *global_game_ptr = nullptr;
 
 extern "C" {
@@ -77,6 +79,8 @@ int main() {
   emscripten_set_resize_callback(EMSCRIPTEN_EVENT_TARGET_WINDOW, &game, false,
                                  resize_event_callback);
 
+  //glEnable(GL_DEPTH_TEST);
+
   emscripten_set_main_loop_arg(jumpartifact_demo_update, &game, 0, 1);
 #else
   {
diff --git a/src/screen.cc b/src/screen.cc
index 8de103f..2570c5b 100644
--- a/src/screen.cc
+++ b/src/screen.cc
@@ -12,6 +12,10 @@
 // local includes
 #include "screen_test.h"
 
+#ifdef __EMSCRIPTEN__
+//#include <GLES2/gl2.h>
+#endif
+
 Screen::Screen(std::weak_ptr<ScreenStack> stack) : stack(stack) {}
 
 ScreenStack::PendingAction::PendingAction() : screen(), action(Action::NOP) {}
@@ -80,6 +84,11 @@ void ScreenStack::draw() {
   }
 
   BeginDrawing();
+
+#ifdef __EMSCRIPTEN__
+  //glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+#endif
+
   DrawTextureRec(
       render_texture->texture,
       Rectangle{0, 0, (float)GetScreenWidth(), (float)-GetScreenHeight()},
diff --git a/src/screen_trunner.cc b/src/screen_trunner.cc
index 1a87355..915518e 100644
--- a/src/screen_trunner.cc
+++ b/src/screen_trunner.cc
@@ -18,6 +18,10 @@
 #include "ems.h"
 #include "screen_walker_hack.h"
 
+#ifdef __EMSCRIPTEN__
+//#include <GLES2/gl2.h>
+#endif
+
 TRunnerScreen::TRunnerScreen(std::weak_ptr<ScreenStack> stack)
     : Screen(stack),
       surface(),
@@ -476,6 +480,11 @@ bool TRunnerScreen::draw(RenderTexture *render_texture) {
   }
 
   BeginTextureMode(*render_texture);
+
+#ifdef __EMSCRIPTEN__
+  //glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+#endif
+
   DrawTextureRec(
       bgRenderTexture.texture,
       Rectangle{0, 0, (float)GetScreenWidth(), (float)-GetScreenHeight()},
-- 
2.49.0