use OpenGL legacy API for windows (faster than GDI)

CMakeLists.txt

@@ -5,6 +5,8 @@ project(${PROJECT_NAME})
 
 message("Processing " ${PROJECT_NAME})
 
+# Detect iOS
+#--------------------------------------
 if(NOT DEFINED IOS)
     if(DEFINED CMAKE_SYSTEM_NAME)
         string(TOLOWER CMAKE_SYSTEM_NAME CMAKE_SYSTEM_NAME_LOWER)
@@ -14,6 +16,8 @@ if(NOT DEFINED IOS)
     endif()
 endif()
 
+# Sources
+#--------------------------------------
 set(SrcLib
     include/MiniFB.h
     include/MiniFB_cpp.h
@@ -27,11 +31,13 @@ set(SrcLib
     src/WindowData.h
 )
 
+#--
 set(SrcWindows
     src/windows/WinMiniFB.c
     src/windows/WindowData_Win.h
 )
 
+#--
 set(SrcMacOSX
     src/macosx/MacMiniFB.m
     src/macosx/OSXWindow.h
@@ -43,6 +49,7 @@ set(SrcMacOSX
     src/macosx/WindowData_OSX.h
 )
 
+#--
 set(SrcIOS
     src/ios/WindowData_IOS.h
     src/ios/iOSMiniFB.m
@@ -55,18 +62,25 @@ set(SrcIOS
     include/MiniFB_ios.h
 )
 
+#--
 set(SrcWayland
     src/wayland/WaylandMiniFB.c
     src/wayland/WindowData_Way.h
     src/MiniFB_linux.c
 )
 
+#--
 set(SrcX11
     src/x11/X11MiniFB.c
     src/x11/WindowData_X11.h
     src/MiniFB_linux.c
 )
 
+set(SrcGL
+    src/gl/MiniFB_GL.h
+    src/gl/MiniFB_GL.c
+)
+
 # Avoid RelWithDebInfo and MinSizeRel
 #--------------------------------------
 set(CMAKE_CONFIGURATION_TYPES "Debug;Release" CACHE STRING "" FORCE)
@@ -88,9 +102,17 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 #--------------------------------------
 option(MINIFB_BUILD_EXAMPLES "Build minifb example programs" TRUE)
 
+if(APPLE AND NOT IOS)
+    option(USE_METAL_API "Build the project using metal API code" ON)
+elseif(UNIX)
+    option(USE_WAYLAND_API "Build the project using wayland API code" OFF)
+elseif(WIN32)
+    option(USE_OPENGL_API "Build the project using OpenGL API code" ON)
+endif()
+
 # Set GCC/Clang flags
 #--------------------------------------
-if (NOT MSVC)
+if(NOT MSVC)
     # Avoid default flag values
     #--------------------------------------
     set(CMAKE_C_FLAGS "" CACHE STRING "" FORCE)
@@ -113,44 +135,48 @@ if (NOT MSVC)
     #--------------------------------------
     add_compile_options("$<$<CONFIG:Debug>:-g>")
     add_compile_options("$<IF:$<CONFIG:Debug>,-O0,-O2>")
-    set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -pedantic -Wno-switch -Wno-unused-function -Wno-implicit-fallthrough")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -pedantic -Wno-switch -Wno-unused-function -Wno-implicit-fallthrough")
-    set (CMAKE_OBJC_FLAGS "${CMAKE_C_FLAGS}")
+    set(CMAKE_OBJC_FLAGS "${CMAKE_C_FLAGS}")
-    set (CMAKE_OBJCXX_FLAGS "${CMAKE_CXX_FLAGS}")
+    set(CMAKE_OBJCXX_FLAGS "${CMAKE_CXX_FLAGS}")
-endif()
-
-# Set default cmake flags
-#--------------------------------------
-if (APPLE AND NOT IOS) 
-    OPTION(USE_METAL_API "Build the project using metal API code" ON)
-elseif (UNIX)
-    OPTION(USE_WAYLAND_API "Build the project using wayland API code" OFF)
 endif()
 
 # Set compiler/platform specific flags and dependencies
 #--------------------------------------
-if (MSVC)
+if(WIN32)
-    add_definitions(-D_CRT_SECURE_NO_WARNINGS)
-    add_definitions(-D_WIN32_WINNT=0x0600)
 
-    list (APPEND SrcLib ${SrcWindows})
+    if(MSVC)
-elseif (MINGW)
+        add_definitions(-D_CRT_SECURE_NO_WARNINGS)
-    add_definitions(-D_WIN32_WINNT=0x0600)
+    endif()
+    add_definitions(-D_WIN32_WINNT=0x0601)  # Windows 7 (we are in 2020)
+
+    if(USE_OPENGL_API)
+        list(APPEND SrcLib ${SrcGL})
+
+        add_definitions(-DUSE_OPENGL_API)
+    endif()
 
     list(APPEND SrcLib ${SrcWindows})
-elseif (IOS)
+
+elseif(IOS)
+
     list(APPEND SrcLib ${SrcIOS})
-elseif (APPLE)
+
+elseif(APPLE)
+
     if(USE_METAL_API)
         add_definitions(-DUSE_METAL_API)
     endif()
 
     list(APPEND SrcLib ${SrcMacOSX})
-elseif (UNIX)
+
+elseif(UNIX)
+
     if(USE_WAYLAND_API)
         list(APPEND SrcLib ${SrcWayland})
     else()
         list(APPEND SrcLib ${SrcX11})
     endif()
+
 endif()
 
 # Library
@@ -159,8 +185,10 @@ add_library(minifb STATIC
     ${SrcLib}
 )
 
+# Link
 #--------------------------------------
-if (APPLE)
+if(APPLE)
+
     if(IOS)
         target_link_libraries(minifb
             "-framework UIKit"
@@ -176,7 +204,9 @@ if (APPLE)
             "-framework MetalKit"
         )
     endif()
-elseif (UNIX)
+
+elseif(UNIX)
+
     if(USE_WAYLAND_API)
         target_link_libraries(minifb
             "-lwayland-client"
@@ -187,6 +217,15 @@ elseif (UNIX)
             "-lX11"
         )
     endif()
+
+elseif(WIN32)
+
+    if(USE_OPENGL_API)
+        target_link_libraries(minifb
+            "Opengl32.lib"
+        )
+    endif()
+
 endif()
 
 # For all projects
@@ -198,7 +237,7 @@ link_libraries(minifb)
 
 # Examples
 #--------------------------------------
-if (MINIFB_BUILD_EXAMPLES)
+if(MINIFB_BUILD_EXAMPLES)
     if(NOT IOS)
 
         add_executable(noise

src/MiniFB_internal.c

@@ -97,8 +97,8 @@ calc_dst_factor(SWindowData *window_data, uint32_t width, uint32_t height) {
 //-------------------------------------
 void 
 resize_dst(SWindowData *window_data, uint32_t width, uint32_t height) {
-    window_data->dst_offset_x = width  * window_data->factor_x;
+    window_data->dst_offset_x = (uint32_t) (width  * window_data->factor_x);
-    window_data->dst_offset_y = height * window_data->factor_y;
+    window_data->dst_offset_y = (uint32_t) (height * window_data->factor_y);
-    window_data->dst_width    = width  * window_data->factor_width;
+    window_data->dst_width    = (uint32_t) (width  * window_data->factor_width);
-    window_data->dst_height   = height * window_data->factor_height;
+    window_data->dst_height   = (uint32_t) (height * window_data->factor_height);
 }

src/WindowData.h

@@ -43,6 +43,7 @@ typedef struct {
     uint32_t                mod_keys;
 
     bool                    is_active;
+    bool                    is_initialized;
 
     bool                    close;
 } SWindowData;

src/gl/MiniFB_GL.c

@@ -0,0 +1,170 @@
+#if defined(USE_OPENGL_API)
+
+#include "MiniFB_GL.h"
+#if defined(_WIN32) || defined(WIN32)
+    #include <windows/WindowData_Win.h>
+#endif
+#include <gl/gl.h>
+#include <stdlib.h>
+
+//#define kUse_Clean_UP
+#if defined(kUse_Clean_UP)
+    #define UseCleanUp(x) x
+#else
+    #define UseCleanUp(x)
+#endif
+
+//-------------------------------------
+void setup_pixel_format(HDC hDC);
+
+//-------------------------------------
+void 
+create_GL_context(SWindowData *window_data) {
+    SWindowData_Win *window_data_win;
+
+    window_data_win = (SWindowData_Win *) window_data->specific;
+    setup_pixel_format(window_data_win->hdc);
+    window_data_win->hGLRC = wglCreateContext(window_data_win->hdc);
+    wglMakeCurrent(window_data_win->hdc, window_data_win->hGLRC);
+    init_GL(window_data);
+}
+
+//-------------------------------------
+void
+setup_pixel_format(HDC hDC) {
+    int pixelFormat;
+
+    PIXELFORMATDESCRIPTOR pfd = {
+        sizeof(PIXELFORMATDESCRIPTOR),  // size
+        1,                              // version
+        PFD_SUPPORT_OPENGL |            //
+        PFD_DRAW_TO_WINDOW |            //
+        PFD_DOUBLEBUFFER,               // support double-buffering
+        PFD_TYPE_RGBA,                  // color type
+        24,                             // preferred color depth
+        0, 0, 0, 0, 0, 0,               // color and shift bits (ignored)
+        0,                              // no alpha buffer
+        0,                              // alpha bits (ignored)
+        0,                              // no accumulation buffer
+        0, 0, 0, 0,                     // accum bits (ignored)
+        24,                             // depth buffer
+        8,                              // no stencil buffer
+        0,                              // no auxiliary buffers
+        PFD_MAIN_PLANE,                 // main layer
+        0,                              // reserved
+        0, 0, 0,                        // no layer, visible, damage masks
+    };
+
+    pixelFormat = ChoosePixelFormat(hDC, &pfd);
+    if (pixelFormat == 0) {
+        MessageBox(WindowFromDC(hDC), "ChoosePixelFormat failed.", "Error", MB_ICONERROR | MB_OK);
+        exit(1);
+    }
+
+    if (SetPixelFormat(hDC, pixelFormat, &pfd) != TRUE) {
+        MessageBox(WindowFromDC(hDC), "SetPixelFormat failed.", "Error", MB_ICONERROR | MB_OK);
+        exit(1);
+    }
+}
+
+#define TEXTURE0    0x84C0
+
+//-------------------------------------
+void 
+init_GL(SWindowData *window_data) {
+    SWindowData_Win *window_data_win;
+
+    window_data_win = (SWindowData_Win *) window_data->specific;
+
+    glViewport(0, 0, window_data->window_width, window_data->window_height);
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glOrtho(0, window_data->window_width, window_data->window_height, 0, 2048, -2048);
+
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+
+    glDisable(GL_DEPTH_TEST);
+    glDisable(GL_STENCIL_TEST);
+
+    glEnable(GL_TEXTURE_2D);
+
+    glGenTextures(1, &window_data_win->text_id);
+    //glActiveTexture(TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, window_data_win->text_id);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+
+    UseCleanUp(glDisableClientState(GL_TEXTURE_COORD_ARRAY));
+    UseCleanUp(glDisableClientState(GL_VERTEX_ARRAY));
+    UseCleanUp(glBindTexture(GL_TEXTURE_2D, 0));
+}
+
+//-------------------------------------
+void 
+resize_GL(SWindowData *window_data) {
+    if(window_data->is_initialized) {
+        glViewport(0, 0, window_data->window_width, window_data->window_height);
+
+        glMatrixMode(GL_PROJECTION);
+        glLoadIdentity();
+        glOrtho(0, window_data->window_width, window_data->window_height, 0, 2048, -2048);
+
+        glClear(GL_COLOR_BUFFER_BIT);
+    }
+}
+
+//-------------------------------------
+void 
+redraw_GL(SWindowData *window_data, const void *pixels) {
+    float           x, y, w, h;
+    SWindowData_Win *window_data_ex;
+
+    window_data_ex = (SWindowData_Win *) window_data->specific;
+
+    x = (float) window_data->dst_offset_x;
+    y = (float) window_data->dst_offset_y;
+    w = (float) window_data->dst_offset_x + window_data->dst_width;
+    h = (float) window_data->dst_offset_y + window_data->dst_height;
+
+    float vertices[] = {
+        x, y,
+        0, 0, 
+
+        w, y,
+        1, 0,
+        
+        x, h,
+        0, 1,
+
+        w, h,
+        1, 1,
+    };
+
+    glClear(GL_COLOR_BUFFER_BIT);
+
+    UseCleanUp(glBindTexture(GL_TEXTURE_2D, window_data_ex->text_id));
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, window_data->buffer_width, window_data->buffer_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
+    //glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, window_data->buffer_width, window_data->buffer_height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
+
+    UseCleanUp(glEnableClientState(GL_VERTEX_ARRAY));
+    UseCleanUp(glEnableClientState(GL_TEXTURE_COORD_ARRAY));
+    glVertexPointer(2, GL_FLOAT, 4 * sizeof(float), vertices);
+    glTexCoordPointer(2, GL_FLOAT, 4 * sizeof(float), vertices + 2);
+
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+    UseCleanUp(glDisableClientState(GL_TEXTURE_COORD_ARRAY));
+    UseCleanUp(glDisableClientState(GL_VERTEX_ARRAY));
+    UseCleanUp(glBindTexture(GL_TEXTURE_2D, 0));
+
+    SwapBuffers(window_data_ex->hdc);
+}
+
+#endif

src/gl/MiniFB_GL.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#if defined(USE_OPENGL_API)
+
+    #include "WindowData.h"
+
+    void create_GL_context(SWindowData *window_data);
+    void init_GL(SWindowData *window_data);
+    void redraw_GL(SWindowData *window_data, const void *pixels);
+    void resize_GL(SWindowData *window_data);
+    
+#endif

src/ios/iOSMiniFB.m

@@ -95,6 +95,7 @@ mfb_open_ex(const char *title, unsigned width, unsigned height, unsigned flags)
         }
         [window makeKeyAndVisible];
 
+        window_data->is_initialized = true;
         return (struct mfb_window *) window_data;
     }
 }

src/macosx/MacMiniFB.m

@@ -151,12 +151,15 @@ mfb_open_ex(const char *title, unsigned width, unsigned height, unsigned flags)
 
         mfb_set_keyboard_callback((struct mfb_window *) window_data, keyboard_default);
 
+#if defined(_DEBUG) || defined(DEBUG)
     #if defined(USE_METAL_API)
         NSLog(@"Window created using Metal API");
     #else
         NSLog(@"Window created using Cocoa API");
     #endif
+#endif
 
+        window_data->is_initialized = true;
         return (struct mfb_window *) window_data;
     }    
 }

src/wayland/WaylandMiniFB.c

@@ -661,13 +661,17 @@ mfb_open_ex(const char *title, unsigned width, unsigned height, unsigned flags)
 
     mfb_set_keyboard_callback((struct mfb_window *) window_data, keyboard_default);
 
+#if defined(_DEBUG) || defined(DEBUG)
     printf("Window created using Wayland API\n");
+#endif
 
+    window_data->is_initialized = true;
     return (struct mfb_window *) window_data;
 
 out:
     close(window_data_way->fd);
     destroy(window_data);
+
     return 0x0;
 }
 

src/windows/WinMiniFB.c

@@ -2,7 +2,9 @@
 #include <MiniFB_internal.h>
 #include <WindowData.h>
 #include "WindowData_Win.h"
-
+#if defined(USE_OPENGL_API)
+    #include "gl/MiniFB_GL.h"
+#endif
 #include <stdlib.h>
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -29,31 +31,18 @@ WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
 
     switch (message)
     {
+#if !defined(USE_OPENGL_API)
         case WM_PAINT:
         {
             if (window_data && window_data->draw_buffer && window_data_win)
             {
-                //if (window_data->dst_offset_x > 0) {
-                //    BitBlt(window_data_win->hdc, 0, window_data->dst_offset_y, window_data->dst_offset_x, window_data->dst_height, 0, 0, 0, BLACKNESS);
-                //}
-                //if (window_data->dst_offset_y > 0) {
-                //    BitBlt(window_data_win->hdc, 0, 0, window_data->window_width, window_data->dst_offset_y, 0, 0, 0, BLACKNESS);
-                //}
-                //uint32_t offsetY = window_data->dst_offset_y + window_data->dst_height;
-                //if (offsetY < window_data->window_height) {
-                //    BitBlt(window_data_win->hdc, 0, offsetY, window_data->window_width, window_data->window_height - offsetY, 0, 0, 0, BLACKNESS);
-                //}
-                //uint32_t offsetX = window_data->dst_offset_x + window_data->dst_width;
-                //if (offsetX < window_data->window_width) {
-                //    BitBlt(window_data_win->hdc, offsetX, window_data->dst_offset_y, window_data->window_width - offsetX, window_data->dst_height, 0, 0, 0, BLACKNESS);
-                //}
-
                 StretchDIBits(window_data_win->hdc, window_data->dst_offset_x, window_data->dst_offset_y, window_data->dst_width, window_data->dst_height, 0, 0, window_data->buffer_width, window_data->buffer_height, window_data->draw_buffer, 
                               window_data_win->bitmapInfo, DIB_RGB_COLORS, SRCCOPY);
             }
             ValidateRect(hWnd, 0x0);
             break;
         }
+#endif
 
         case WM_DESTROY:
         case WM_CLOSE:
@@ -187,7 +176,12 @@ WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
                 window_data->window_width  = LOWORD(lParam);
                 window_data->window_height = HIWORD(lParam);
                 resize_dst(window_data, LOWORD(lParam), HIWORD(lParam));
+
+#if !defined(USE_OPENGL_API)
                 BitBlt(window_data_win->hdc, 0, 0, window_data->window_width, window_data->window_height, 0, 0, 0, BLACKNESS);
+#else
+                resize_GL(window_data);
+#endif
                 kCall(resize_func, window_data->dst_width, window_data->dst_height);
             }
             break;
@@ -334,12 +328,17 @@ mfb_open_ex(const char *title, unsigned width, unsigned height, unsigned flags)
 
     ShowWindow(window_data_win->window, SW_NORMAL);
 
+    window_data_win->hdc = GetDC(window_data_win->window);
+
+#if !defined(USE_OPENGL_API)
+
     window_data_win->bitmapInfo = (BITMAPINFO *) calloc(1, sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * 3);
     if(window_data_win->bitmapInfo == 0x0) {
         free(window_data);
         free(window_data_win);
         return 0x0;
     }
+
     window_data_win->bitmapInfo->bmiHeader.biSize        = sizeof(BITMAPINFOHEADER);
     window_data_win->bitmapInfo->bmiHeader.biPlanes      = 1;
     window_data_win->bitmapInfo->bmiHeader.biBitCount    = 32;
@@ -350,12 +349,25 @@ mfb_open_ex(const char *title, unsigned width, unsigned height, unsigned flags)
     window_data_win->bitmapInfo->bmiColors[1].rgbGreen   = 0xff;
     window_data_win->bitmapInfo->bmiColors[2].rgbBlue    = 0xff;
 
-    window_data_win->hdc = GetDC(window_data_win->window);
+#else
+
+    create_GL_context(window_data);
+
+#endif
 
     window_data_win->timer = mfb_timer_create();
 
     mfb_set_keyboard_callback((struct mfb_window *) window_data, keyboard_default);
 
+#if defined(_DEBUG) || defined(DEBUG)
+    #if defined(USE_OPENGL_API)
+        printf("Window created using OpenGL API\n");
+    #else
+        printf("Window created using GDI API\n");
+    #endif
+#endif
+
+    window_data->is_initialized = true;
     return (struct mfb_window *) window_data;
 }
 
@@ -385,11 +397,20 @@ mfb_update_ex(struct mfb_window *window, void *buffer, unsigned width, unsigned
     window_data->buffer_height = height;
 
     SWindowData_Win *window_data_win = (SWindowData_Win *) window_data->specific;
+
+#if !defined(USE_OPENGL_API)
+
     window_data_win->bitmapInfo->bmiHeader.biWidth = window_data->buffer_width;
     window_data_win->bitmapInfo->bmiHeader.biHeight = -(LONG) window_data->buffer_height;
     InvalidateRect(window_data_win->window, 0x0, TRUE);
     SendMessage(window_data_win->window, WM_PAINT, 0, 0);
 
+#else
+
+    redraw_GL(window_data, buffer);
+
+#endif
+
     while (window_data->close == false && PeekMessage(&msg, window_data_win->window, 0, 0, PM_REMOVE)) {
         TranslateMessage(&msg);
         DispatchMessage(&msg);
@@ -481,10 +502,18 @@ destroy_window_data(SWindowData *window_data) {
 
     SWindowData_Win *window_data_win = (SWindowData_Win *) window_data->specific;
 
-    window_data->draw_buffer = 0x0;
+#if !defined(USE_OPENGL_API)
     if (window_data_win->bitmapInfo != 0x0) {
         free(window_data_win->bitmapInfo);
+        window_data_win->bitmapInfo = 0x0;
     }
+#else
+    if (window_data_win->hGLRC) {
+        wglMakeCurrent(NULL, NULL);
+        wglDeleteContext(window_data_win->hGLRC);
+        window_data_win->hGLRC = 0;
+    }
+#endif
 
     if (window_data_win->window != 0 && window_data_win->hdc != 0) {
         ReleaseDC(window_data_win->window, window_data_win->hdc);
@@ -492,11 +521,13 @@ destroy_window_data(SWindowData *window_data) {
     }
 
     window_data_win->window = 0;
-    window_data_win->hdc = 0;
+    window_data_win->hdc    = 0;
-    window_data_win->bitmapInfo = 0x0;
+
     mfb_timer_destroy(window_data_win->timer);
     window_data_win->timer = 0x0;
-    window_data->close = true;
+
+    window_data->draw_buffer = 0x0;
+    window_data->close       = true;
 }
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -686,7 +717,6 @@ translate_key(unsigned int wParam, unsigned long lParam) {
 bool 
 mfb_set_viewport(struct mfb_window *window, unsigned offset_x, unsigned offset_y, unsigned width, unsigned height) {
     SWindowData     *window_data     = (SWindowData *) window;
-    SWindowData_Win *window_data_win = 0x0;
 
     if(window_data == 0x0) {
         return false;
@@ -707,8 +737,12 @@ mfb_set_viewport(struct mfb_window *window, unsigned offset_x, unsigned offset_y
 
     calc_dst_factor(window_data, window_data->window_width, window_data->window_height);
 
+#if !defined(USE_OPENGL_API)
+    SWindowData_Win *window_data_win = 0x0;
+
     window_data_win = (SWindowData_Win *) window_data->specific;
     BitBlt(window_data_win->hdc, 0, 0, window_data->window_width, window_data->window_height, 0, 0, 0, BLACKNESS);
+#endif
 
     return true;
 }

src/windows/WindowData_Win.h

@@ -5,12 +5,16 @@
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
-
 typedef struct {
     HWND                window;
     WNDCLASS            wc;
     HDC                 hdc;
+#if defined(USE_OPENGL_API)
+    HGLRC               hGLRC;
+    uint32_t            text_id;
+#else
     BITMAPINFO          *bitmapInfo;
+#endif
     struct mfb_timer    *timer;
     bool                mouse_inside;
 } SWindowData_Win;

src/x11/X11MiniFB.c

@@ -189,8 +189,11 @@ mfb_open_ex(const char *title, unsigned width, unsigned height, unsigned flags)
 
     mfb_set_keyboard_callback((struct mfb_window *) window_data, keyboard_default);
 
+#if defined(_DEBUG) || defined(DEBUG)
     printf("Window created using X11 API\n");
+#endif
 
+    window_data->is_initialized = true;
     return (struct mfb_window *) window_data;
 }