80 files changed, 34 insertions, 0 deletions
diff --git a/dependencies/SDL/SDL.h b/dependencies/include/SDL/SDL.h
index 12e7f31..12e7f31 100644
--- a/dependencies/SDL/SDL.h
+++ b/dependencies/include/SDL/SDL.h
diff --git a/dependencies/SDL/SDL_assert.h b/dependencies/include/SDL/SDL_assert.h
index e71cf97..e71cf97 100644
--- a/dependencies/SDL/SDL_assert.h
+++ b/dependencies/include/SDL/SDL_assert.h
diff --git a/dependencies/SDL/SDL_atomic.h b/dependencies/include/SDL/SDL_atomic.h
index f0c05f4..f0c05f4 100644
--- a/dependencies/SDL/SDL_atomic.h
+++ b/dependencies/include/SDL/SDL_atomic.h
diff --git a/dependencies/SDL/SDL_audio.h b/dependencies/include/SDL/SDL_audio.h
index c42de3e..c42de3e 100644
--- a/dependencies/SDL/SDL_audio.h
+++ b/dependencies/include/SDL/SDL_audio.h
diff --git a/dependencies/SDL/SDL_bits.h b/dependencies/include/SDL/SDL_bits.h
index 22cb853..22cb853 100644
--- a/dependencies/SDL/SDL_bits.h
+++ b/dependencies/include/SDL/SDL_bits.h
diff --git a/dependencies/SDL/SDL_blendmode.h b/dependencies/include/SDL/SDL_blendmode.h
index 08c9f9d..08c9f9d 100644
--- a/dependencies/SDL/SDL_blendmode.h
+++ b/dependencies/include/SDL/SDL_blendmode.h
diff --git a/dependencies/SDL/SDL_clipboard.h b/dependencies/include/SDL/SDL_clipboard.h
index 783c7c2..783c7c2 100644
--- a/dependencies/SDL/SDL_clipboard.h
+++ b/dependencies/include/SDL/SDL_clipboard.h
diff --git a/dependencies/SDL/SDL_config.h b/dependencies/include/SDL/SDL_config.h
index c6283b2..c6283b2 100644
--- a/dependencies/SDL/SDL_config.h
+++ b/dependencies/include/SDL/SDL_config.h
diff --git a/dependencies/SDL/SDL_copying.h b/dependencies/include/SDL/SDL_copying.h
index 49e3f9d..49e3f9d 100644
--- a/dependencies/SDL/SDL_copying.h
+++ b/dependencies/include/SDL/SDL_copying.h
diff --git a/dependencies/SDL/SDL_cpuinfo.h b/dependencies/include/SDL/SDL_cpuinfo.h
index b5ad0fc..b5ad0fc 100644
--- a/dependencies/SDL/SDL_cpuinfo.h
+++ b/dependencies/include/SDL/SDL_cpuinfo.h
diff --git a/dependencies/SDL/SDL_egl.h b/dependencies/include/SDL/SDL_egl.h
index e8bd657..e8bd657 100644
--- a/dependencies/SDL/SDL_egl.h
+++ b/dependencies/include/SDL/SDL_egl.h
diff --git a/dependencies/SDL/SDL_endian.h b/dependencies/include/SDL/SDL_endian.h
index c3f8431..c3f8431 100644
--- a/dependencies/SDL/SDL_endian.h
+++ b/dependencies/include/SDL/SDL_endian.h
diff --git a/dependencies/SDL/SDL_error.h b/dependencies/include/SDL/SDL_error.h
index 5c961e4..5c961e4 100644
--- a/dependencies/SDL/SDL_error.h
+++ b/dependencies/include/SDL/SDL_error.h
diff --git a/dependencies/SDL/SDL_events.h b/dependencies/include/SDL/SDL_events.h
index 55a343e..55a343e 100644
--- a/dependencies/SDL/SDL_events.h
+++ b/dependencies/include/SDL/SDL_events.h
diff --git a/dependencies/SDL/SDL_filesystem.h b/dependencies/include/SDL/SDL_filesystem.h
index 1914f81..1914f81 100644
--- a/dependencies/SDL/SDL_filesystem.h
+++ b/dependencies/include/SDL/SDL_filesystem.h
diff --git a/dependencies/SDL/SDL_gamecontroller.h b/dependencies/include/SDL/SDL_gamecontroller.h
index 4703b63..4703b63 100644
--- a/dependencies/SDL/SDL_gamecontroller.h
+++ b/dependencies/include/SDL/SDL_gamecontroller.h
diff --git a/dependencies/SDL/SDL_gesture.h b/dependencies/include/SDL/SDL_gesture.h
index e2caea2..e2caea2 100644
--- a/dependencies/SDL/SDL_gesture.h
+++ b/dependencies/include/SDL/SDL_gesture.h
diff --git a/dependencies/SDL/SDL_guid.h b/dependencies/include/SDL/SDL_guid.h
index b971636..b971636 100644
--- a/dependencies/SDL/SDL_guid.h
+++ b/dependencies/include/SDL/SDL_guid.h
diff --git a/dependencies/SDL/SDL_haptic.h b/dependencies/include/SDL/SDL_haptic.h
index f240ae9..f240ae9 100644
--- a/dependencies/SDL/SDL_haptic.h
+++ b/dependencies/include/SDL/SDL_haptic.h
diff --git a/dependencies/SDL/SDL_hidapi.h b/dependencies/include/SDL/SDL_hidapi.h
index 354af5c..354af5c 100644
--- a/dependencies/SDL/SDL_hidapi.h
+++ b/dependencies/include/SDL/SDL_hidapi.h
diff --git a/dependencies/SDL/SDL_hints.h b/dependencies/include/SDL/SDL_hints.h
index 76a74f0..76a74f0 100644
--- a/dependencies/SDL/SDL_hints.h
+++ b/dependencies/include/SDL/SDL_hints.h
diff --git a/dependencies/SDL/SDL_joystick.h b/dependencies/include/SDL/SDL_joystick.h
index 72c6604..72c6604 100644
--- a/dependencies/SDL/SDL_joystick.h
+++ b/dependencies/include/SDL/SDL_joystick.h
diff --git a/dependencies/SDL/SDL_keyboard.h b/dependencies/include/SDL/SDL_keyboard.h
index e7663fb..e7663fb 100644
--- a/dependencies/SDL/SDL_keyboard.h
+++ b/dependencies/include/SDL/SDL_keyboard.h
diff --git a/dependencies/SDL/SDL_keycode.h b/dependencies/include/SDL/SDL_keycode.h
index 65420f2..65420f2 100644
--- a/dependencies/SDL/SDL_keycode.h
+++ b/dependencies/include/SDL/SDL_keycode.h
diff --git a/dependencies/SDL/SDL_loadso.h b/dependencies/include/SDL/SDL_loadso.h
index 61857c8..61857c8 100644
--- a/dependencies/SDL/SDL_loadso.h
+++ b/dependencies/include/SDL/SDL_loadso.h
diff --git a/dependencies/SDL/SDL_locale.h b/dependencies/include/SDL/SDL_locale.h
index 7515779..7515779 100644
--- a/dependencies/SDL/SDL_locale.h
+++ b/dependencies/include/SDL/SDL_locale.h
diff --git a/dependencies/SDL/SDL_log.h b/dependencies/include/SDL/SDL_log.h
index 1d8b20b..1d8b20b 100644
--- a/dependencies/SDL/SDL_log.h
+++ b/dependencies/include/SDL/SDL_log.h
diff --git a/dependencies/SDL/SDL_main.h b/dependencies/include/SDL/SDL_main.h
index 113d11d..113d11d 100644
--- a/dependencies/SDL/SDL_main.h
+++ b/dependencies/include/SDL/SDL_main.h
diff --git a/dependencies/SDL/SDL_messagebox.h b/dependencies/include/SDL/SDL_messagebox.h
index d763534..d763534 100644
--- a/dependencies/SDL/SDL_messagebox.h
+++ b/dependencies/include/SDL/SDL_messagebox.h
diff --git a/dependencies/SDL/SDL_metal.h b/dependencies/include/SDL/SDL_metal.h
index 9285471..9285471 100644
--- a/dependencies/SDL/SDL_metal.h
+++ b/dependencies/include/SDL/SDL_metal.h
diff --git a/dependencies/SDL/SDL_misc.h b/dependencies/include/SDL/SDL_misc.h
index 261b6b8..261b6b8 100644
--- a/dependencies/SDL/SDL_misc.h
+++ b/dependencies/include/SDL/SDL_misc.h
diff --git a/dependencies/SDL/SDL_mouse.h b/dependencies/include/SDL/SDL_mouse.h
index b318c70..b318c70 100644
--- a/dependencies/SDL/SDL_mouse.h
+++ b/dependencies/include/SDL/SDL_mouse.h
diff --git a/dependencies/SDL/SDL_mutex.h b/dependencies/include/SDL/SDL_mutex.h
index 173468f..173468f 100644
--- a/dependencies/SDL/SDL_mutex.h
+++ b/dependencies/include/SDL/SDL_mutex.h
diff --git a/dependencies/SDL/SDL_name.h b/dependencies/include/SDL/SDL_name.h
index 6ff35b4..6ff35b4 100644
--- a/dependencies/SDL/SDL_name.h
+++ b/dependencies/include/SDL/SDL_name.h
diff --git a/dependencies/SDL/SDL_opengl.h b/dependencies/include/SDL/SDL_opengl.h
index 0f2b257..0f2b257 100644
--- a/dependencies/SDL/SDL_opengl.h
+++ b/dependencies/include/SDL/SDL_opengl.h
diff --git a/dependencies/SDL/SDL_opengl_glext.h b/dependencies/include/SDL/SDL_opengl_glext.h
index 8527e17..8527e17 100644
--- a/dependencies/SDL/SDL_opengl_glext.h
+++ b/dependencies/include/SDL/SDL_opengl_glext.h
diff --git a/dependencies/SDL/SDL_opengles.h b/dependencies/include/SDL/SDL_opengles.h
index 8511b96..8511b96 100644
--- a/dependencies/SDL/SDL_opengles.h
+++ b/dependencies/include/SDL/SDL_opengles.h
diff --git a/dependencies/SDL/SDL_opengles2.h b/dependencies/include/SDL/SDL_opengles2.h
index 172fcb3..172fcb3 100644
--- a/dependencies/SDL/SDL_opengles2.h
+++ b/dependencies/include/SDL/SDL_opengles2.h
diff --git a/dependencies/SDL/SDL_opengles2_gl2.h b/dependencies/include/SDL/SDL_opengles2_gl2.h
index d13622a..d13622a 100644
--- a/dependencies/SDL/SDL_opengles2_gl2.h
+++ b/dependencies/include/SDL/SDL_opengles2_gl2.h
diff --git a/dependencies/SDL/SDL_opengles2_gl2ext.h b/dependencies/include/SDL/SDL_opengles2_gl2ext.h
index 9448ce0..9448ce0 100644
--- a/dependencies/SDL/SDL_opengles2_gl2ext.h
+++ b/dependencies/include/SDL/SDL_opengles2_gl2ext.h
diff --git a/dependencies/SDL/SDL_opengles2_gl2platform.h b/dependencies/include/SDL/SDL_opengles2_gl2platform.h
index 426796e..426796e 100644
--- a/dependencies/SDL/SDL_opengles2_gl2platform.h
+++ b/dependencies/include/SDL/SDL_opengles2_gl2platform.h
diff --git a/dependencies/SDL/SDL_opengles2_khrplatform.h b/dependencies/include/SDL/SDL_opengles2_khrplatform.h
index 0164644..0164644 100644
--- a/dependencies/SDL/SDL_opengles2_khrplatform.h
+++ b/dependencies/include/SDL/SDL_opengles2_khrplatform.h
diff --git a/dependencies/SDL/SDL_pixels.h b/dependencies/include/SDL/SDL_pixels.h
index 5d2c0c8..5d2c0c8 100644
--- a/dependencies/SDL/SDL_pixels.h
+++ b/dependencies/include/SDL/SDL_pixels.h
diff --git a/dependencies/SDL/SDL_platform.h b/dependencies/include/SDL/SDL_platform.h
index a8e3ac2..a8e3ac2 100644
--- a/dependencies/SDL/SDL_platform.h
+++ b/dependencies/include/SDL/SDL_platform.h
diff --git a/dependencies/SDL/SDL_power.h b/dependencies/include/SDL/SDL_power.h
index ecb3f4b..ecb3f4b 100644
--- a/dependencies/SDL/SDL_power.h
+++ b/dependencies/include/SDL/SDL_power.h
diff --git a/dependencies/SDL/SDL_quit.h b/dependencies/include/SDL/SDL_quit.h
index 4090f7f..4090f7f 100644
--- a/dependencies/SDL/SDL_quit.h
+++ b/dependencies/include/SDL/SDL_quit.h
diff --git a/dependencies/SDL/SDL_rect.h b/dependencies/include/SDL/SDL_rect.h
index 6c641c5..6c641c5 100644
--- a/dependencies/SDL/SDL_rect.h
+++ b/dependencies/include/SDL/SDL_rect.h
diff --git a/dependencies/SDL/SDL_render.h b/dependencies/include/SDL/SDL_render.h
index 5b7b059..5b7b059 100644
--- a/dependencies/SDL/SDL_render.h
+++ b/dependencies/include/SDL/SDL_render.h
diff --git a/dependencies/SDL/SDL_revision.h b/dependencies/include/SDL/SDL_revision.h
index 5f44fb5..5f44fb5 100644
--- a/dependencies/SDL/SDL_revision.h
+++ b/dependencies/include/SDL/SDL_revision.h
diff --git a/dependencies/SDL/SDL_rwops.h b/dependencies/include/SDL/SDL_rwops.h
index 3960f56..3960f56 100644
--- a/dependencies/SDL/SDL_rwops.h
+++ b/dependencies/include/SDL/SDL_rwops.h
diff --git a/dependencies/SDL/SDL_scancode.h b/dependencies/include/SDL/SDL_scancode.h
index 17e8fe2..17e8fe2 100644
--- a/dependencies/SDL/SDL_scancode.h
+++ b/dependencies/include/SDL/SDL_scancode.h
diff --git a/dependencies/SDL/SDL_sensor.h b/dependencies/include/SDL/SDL_sensor.h
index 684d2c6..684d2c6 100644
--- a/dependencies/SDL/SDL_sensor.h
+++ b/dependencies/include/SDL/SDL_sensor.h
diff --git a/dependencies/SDL/SDL_shape.h b/dependencies/include/SDL/SDL_shape.h
index 1bca927..1bca927 100644
--- a/dependencies/SDL/SDL_shape.h
+++ b/dependencies/include/SDL/SDL_shape.h
diff --git a/dependencies/SDL/SDL_stdinc.h b/dependencies/include/SDL/SDL_stdinc.h
index 70dba7d..70dba7d 100644
--- a/dependencies/SDL/SDL_stdinc.h
+++ b/dependencies/include/SDL/SDL_stdinc.h
diff --git a/dependencies/SDL/SDL_surface.h b/dependencies/include/SDL/SDL_surface.h
index 838de65..838de65 100644
--- a/dependencies/SDL/SDL_surface.h
+++ b/dependencies/include/SDL/SDL_surface.h
diff --git a/dependencies/SDL/SDL_system.h b/dependencies/include/SDL/SDL_system.h
index 0edca63..0edca63 100644
--- a/dependencies/SDL/SDL_system.h
+++ b/dependencies/include/SDL/SDL_system.h
diff --git a/dependencies/SDL/SDL_syswm.h b/dependencies/include/SDL/SDL_syswm.h
index 45f8e75..45f8e75 100644
--- a/dependencies/SDL/SDL_syswm.h
+++ b/dependencies/include/SDL/SDL_syswm.h
diff --git a/dependencies/SDL/SDL_test.h b/dependencies/include/SDL/SDL_test.h
index 8cc9d61..8cc9d61 100644
--- a/dependencies/SDL/SDL_test.h
+++ b/dependencies/include/SDL/SDL_test.h
diff --git a/dependencies/SDL/SDL_test_assert.h b/dependencies/include/SDL/SDL_test_assert.h
index 7342305..7342305 100644
--- a/dependencies/SDL/SDL_test_assert.h
+++ b/dependencies/include/SDL/SDL_test_assert.h
diff --git a/dependencies/SDL/SDL_test_common.h b/dependencies/include/SDL/SDL_test_common.h
index b86520d..b86520d 100644
--- a/dependencies/SDL/SDL_test_common.h
+++ b/dependencies/include/SDL/SDL_test_common.h
diff --git a/dependencies/SDL/SDL_test_compare.h b/dependencies/include/SDL/SDL_test_compare.h
index 8a7a070..8a7a070 100644
--- a/dependencies/SDL/SDL_test_compare.h
+++ b/dependencies/include/SDL/SDL_test_compare.h
diff --git a/dependencies/SDL/SDL_test_crc32.h b/dependencies/include/SDL/SDL_test_crc32.h
index 049da74..049da74 100644
--- a/dependencies/SDL/SDL_test_crc32.h
+++ b/dependencies/include/SDL/SDL_test_crc32.h
diff --git a/dependencies/SDL/SDL_test_font.h b/dependencies/include/SDL/SDL_test_font.h
index 6e7247d..6e7247d 100644
--- a/dependencies/SDL/SDL_test_font.h
+++ b/dependencies/include/SDL/SDL_test_font.h
diff --git a/dependencies/SDL/SDL_test_fuzzer.h b/dependencies/include/SDL/SDL_test_fuzzer.h
index bbe8eb8..bbe8eb8 100644
--- a/dependencies/SDL/SDL_test_fuzzer.h
+++ b/dependencies/include/SDL/SDL_test_fuzzer.h
diff --git a/dependencies/SDL/SDL_test_harness.h b/dependencies/include/SDL/SDL_test_harness.h
index 1fd4236..1fd4236 100644
--- a/dependencies/SDL/SDL_test_harness.h
+++ b/dependencies/include/SDL/SDL_test_harness.h
diff --git a/dependencies/SDL/SDL_test_images.h b/dependencies/include/SDL/SDL_test_images.h
index e2bfc36..e2bfc36 100644
--- a/dependencies/SDL/SDL_test_images.h
+++ b/dependencies/include/SDL/SDL_test_images.h
diff --git a/dependencies/SDL/SDL_test_log.h b/dependencies/include/SDL/SDL_test_log.h
index e3d39ad..e3d39ad 100644
--- a/dependencies/SDL/SDL_test_log.h
+++ b/dependencies/include/SDL/SDL_test_log.h
diff --git a/dependencies/SDL/SDL_test_md5.h b/dependencies/include/SDL/SDL_test_md5.h
index 17b1d2b..17b1d2b 100644
--- a/dependencies/SDL/SDL_test_md5.h
+++ b/dependencies/include/SDL/SDL_test_md5.h
diff --git a/dependencies/SDL/SDL_test_memory.h b/dependencies/include/SDL/SDL_test_memory.h
index cc2edc1..cc2edc1 100644
--- a/dependencies/SDL/SDL_test_memory.h
+++ b/dependencies/include/SDL/SDL_test_memory.h
diff --git a/dependencies/SDL/SDL_test_random.h b/dependencies/include/SDL/SDL_test_random.h
index b1d6060..b1d6060 100644
--- a/dependencies/SDL/SDL_test_random.h
+++ b/dependencies/include/SDL/SDL_test_random.h
diff --git a/dependencies/SDL/SDL_thread.h b/dependencies/include/SDL/SDL_thread.h
index 7364f81..7364f81 100644
--- a/dependencies/SDL/SDL_thread.h
+++ b/dependencies/include/SDL/SDL_thread.h
diff --git a/dependencies/SDL/SDL_timer.h b/dependencies/include/SDL/SDL_timer.h
index 62f81d4..62f81d4 100644
--- a/dependencies/SDL/SDL_timer.h
+++ b/dependencies/include/SDL/SDL_timer.h
diff --git a/dependencies/SDL/SDL_touch.h b/dependencies/include/SDL/SDL_touch.h
index 9592413..9592413 100644
--- a/dependencies/SDL/SDL_touch.h
+++ b/dependencies/include/SDL/SDL_touch.h
diff --git a/dependencies/SDL/SDL_types.h b/dependencies/include/SDL/SDL_types.h
index 355fb50..355fb50 100644
--- a/dependencies/SDL/SDL_types.h
+++ b/dependencies/include/SDL/SDL_types.h
diff --git a/dependencies/SDL/SDL_version.h b/dependencies/include/SDL/SDL_version.h
index 786b112..786b112 100644
--- a/dependencies/SDL/SDL_version.h
+++ b/dependencies/include/SDL/SDL_version.h
diff --git a/dependencies/SDL/SDL_video.h b/dependencies/include/SDL/SDL_video.h
index b2f1509..b2f1509 100644
--- a/dependencies/SDL/SDL_video.h
+++ b/dependencies/include/SDL/SDL_video.h
diff --git a/dependencies/SDL/SDL_vulkan.h b/dependencies/include/SDL/SDL_vulkan.h
index ab86a0b..ab86a0b 100644
--- a/dependencies/SDL/SDL_vulkan.h
+++ b/dependencies/include/SDL/SDL_vulkan.h
diff --git a/dependencies/SDL/begin_code.h b/dependencies/include/SDL/begin_code.h
index b3e69e8..b3e69e8 100644
--- a/dependencies/SDL/begin_code.h
+++ b/dependencies/include/SDL/begin_code.h
diff --git a/dependencies/SDL/close_code.h b/dependencies/include/SDL/close_code.h
index dc73432..dc73432 100644
--- a/dependencies/SDL/close_code.h
+++ b/dependencies/include/SDL/close_code.h
diff --git a/dependencies/src/imgui/imgui_impl_sdl.cpp b/dependencies/src/imgui/imgui_impl_sdl.cpp
index 1273a2f..34e1abb 100644
--- a/dependencies/src/imgui/imgui_impl_sdl.cpp
+++ b/dependencies/src/imgui/imgui_impl_sdl.cpp
@@ -278,6 +278,18 @@ bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
                 SDL_GetWindowPosition(SDL_GetWindowFromID(event->motion.windowID), &window_x, &window_y);
                 mouse_pos.x += window_x;
                 mouse_pos.y += window_y;
+            } else {
+#if defined(__APPLE__)
+                // Fix for high DPI mac
+                ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+                int display_id = SDL_GetWindowDisplayIndex(SDL_GetWindowFromID(event->motion.windowID));
+                if (!platform_io.Monitors.empty() && platform_io.Monitors[display_id].DpiScale > 1.0f)
+                {
+                    // The Framebuffer is scaled by an integer ceiling of the actual ratio, so 2.0 not 1.685 on Mac!
+                    mouse_pos.x *= roundf(platform_io.Monitors[display_id].DpiScale);
+                    mouse_pos.y *= roundf(platform_io.Monitors[display_id].DpiScale);
+                }
+#endif
             }
             io.AddMousePosEvent(mouse_pos.x, mouse_pos.y);
             return true;
@@ -534,7 +546,19 @@ static void ImGui_ImplSDL2_UpdateMouseData()
                 SDL_GetWindowPosition(focused_window, &window_x, &window_y);
                 mouse_x -= window_x;
                 mouse_y -= window_y;
+ #if defined(__APPLE__)
+                // Fix for high DPI mac
+                ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+                int display_id = SDL_GetWindowDisplayIndex(focused_window);
+                if (!platform_io.Monitors.empty() && platform_io.Monitors[display_id].DpiScale > 1.0f)
+                {
+                    // The Framebuffer is scaled by an integer ceiling of the actual ratio, so 2.0 not 1.685 on Mac!
+                    mouse_x *= roundf(platform_io.Monitors[display_id].DpiScale);
+                    mouse_y *= roundf(platform_io.Monitors[display_id].DpiScale);
+                }
+#endif
             }
+
             io.AddMousePosEvent((float)mouse_x, (float)mouse_y);
         }
     }
@@ -673,6 +697,16 @@ void ImGui_ImplSDL2_NewFrame()
     if (w > 0 && h > 0)
         io.DisplayFramebufferScale = ImVec2((float)display_w / w, (float)display_h / h);
 
+#if defined(__APPLE__)
+    // On Apple, The window size is reported in Low DPI, even when running in high DPI mode
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    if (!platform_io.Monitors.empty() && platform_io.Monitors[0].DpiScale > 1.0f && display_h != h)
+    {
+        io.DisplayFramebufferScale = ImVec2(1.0f, 1.0f);
+        io.DisplaySize = ImVec2((float)display_w, (float)display_h);
+    }
+#endif
+
     // Setup time step (we don't use SDL_GetTicks() because it is using millisecond resolution)
     static Uint64 frequency = SDL_GetPerformanceFrequency();
     Uint64 current_time = SDL_GetPerformanceCounter();