From 0b3abad8f26387751620949e587eec4ae4cce2d6 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Wed, 21 May 2025 00:21:58 +0300
Subject: [PATCH] gl: allow to control vsync

---
 gl.c       | 3 +++
 gl.h       | 1 +
 plat_sdl.c | 8 ++++++++
 plat_sdl.h | 1 +
 4 files changed, 13 insertions(+)

diff --git a/gl.c b/gl.c
index 9c1fbfc..4040b7e 100644
--- a/gl.c
+++ b/gl.c
@@ -123,6 +123,9 @@ int gl_init(void *display, void *window, int *quirks, int w, int h)
 		fprintf(stderr, "eglMakeCurrent: %x\n", eglGetError());
 		goto out;
 	}
+	
+	ret = *quirks & GL_QUIRK_VSYNC_ON ? 1 : 0;
+	eglSwapInterval(edpy, ret);
 
 	// 1.x (fixed-function) only
 	glEnable(GL_TEXTURE_2D);
diff --git a/gl.h b/gl.h
index 86475e2..bf8ee0d 100644
--- a/gl.h
+++ b/gl.h
@@ -41,5 +41,6 @@ static __inline void gl_finish(void) {}
 
 #define GL_QUIRK_ACTIVATE_RECREATE 1
 #define GL_QUIRK_SCALING_NEAREST 2
+#define GL_QUIRK_VSYNC_ON 4
 
 #endif // LIBPICOFE_GL_H
diff --git a/plat_sdl.c b/plat_sdl.c
index c4f8fa9..17a1f03 100644
--- a/plat_sdl.c
+++ b/plat_sdl.c
@@ -402,4 +402,12 @@ void plat_sdl_gl_scaling(int type)
   if (type == 0)
     gl_quirks |= GL_QUIRK_SCALING_NEAREST;
 }
+
+void plat_sdl_gl_vsync(int on)
+{
+  gl_quirks &= ~GL_QUIRK_VSYNC_ON;
+  if (on)
+    gl_quirks |= GL_QUIRK_VSYNC_ON;
+}
+
 // vim:shiftwidth=2:expandtab
diff --git a/plat_sdl.h b/plat_sdl.h
index c23cd66..3680a39 100644
--- a/plat_sdl.h
+++ b/plat_sdl.h
@@ -14,4 +14,5 @@ int plat_sdl_change_video_mode(int w, int h, int force);
 void plat_sdl_overlay_clear(void);
 void plat_sdl_event_handler(void *event_);
 void plat_sdl_gl_scaling(int type);
+void plat_sdl_gl_vsync(int on);
 void plat_sdl_finish(void);
-- 
2.39.5