diff --git a/renderer.odin b/renderer.odin
index c869360..baca164 100644
--- a/renderer.odin
+++ b/renderer.odin
@@ -14,6 +14,7 @@ RENDER_BACKEND_METAL        :: #config(RENDER_BACKEND_METAL,        false)
 Renderer :: struct {
     viewport: Viewport,
     surface_ptr: rawptr,
+    vsync: bool,
     backend: rawptr,
 
     pipeline: Pipeline,
@@ -62,6 +63,8 @@ create :: proc(surface_ptr: rawptr) -> (^Renderer, bool) {
         return nil, false
     }
 
+    set_vsync(renderer, true)
+
     { // Create the fullscreen shaders, material and mesh.
         fs_vertex_shader, fs_vertex_shader_ok := create_shader(renderer, .Vertex, "fs_vertex.glsl")
         assert(fs_vertex_shader_ok)
@@ -114,6 +117,24 @@ set_viewport :: proc(renderer: ^Renderer, x, y, width, height: u16) {
     }
 }
 
+set_vsync :: proc(renderer: ^Renderer, on: bool) {
+    assert(renderer != nil)
+
+    if renderer.vsync == on {
+        return
+    }
+
+    success := false
+
+    when RENDER_BACKEND_OPENGL {
+        success = opengl_set_vsync(renderer, on)
+    }
+
+    if success {
+        renderer.vsync = on
+    }
+}
+
 @(private="file") set_clear_color :: proc(renderer: ^Renderer, color: Color) {
     when RENDER_BACKEND_OPENGL {
         opengl_set_clear_color(renderer, color)
diff --git a/renderer_backend_opengl_windows.odin b/renderer_backend_opengl_windows.odin
index 9a2eb00..516aaf6 100644
--- a/renderer_backend_opengl_windows.odin
+++ b/renderer_backend_opengl_windows.odin
@@ -79,6 +79,13 @@ when RENDER_BACKEND_OPENGL {
         })
 
         opengl_swap_buffers(renderer)
+
+        win.wglSwapIntervalEXT = transmute(win.SwapIntervalEXTType)win.wglGetProcAddress("wglSwapIntervalEXT")
+        if win.wglSwapIntervalEXT == nil {
+            opengl_destroy(renderer)
+            return false
+        }
+
         return true
     }
 
@@ -90,6 +97,18 @@ when RENDER_BACKEND_OPENGL {
         )
     }
 
+    opengl_set_vsync :: proc(renderer: ^Renderer, on: bool) -> bool {
+        if win.wglSwapIntervalEXT == nil {
+            fmt.printfln("'wglSwapIntervalEXT' is nil.")
+            return false
+        }
+
+        // Kommer inte in hit.
+        win.wglSwapIntervalEXT(on ? 1 : 0)
+
+        return true
+    }
+
     opengl_set_clear_color :: proc(renderer: ^Renderer, color: Color) {
         r, g, b, a: u8 = max(u8), max(u8), max(u8), max(u8)