Cleanup

This is an extract of a commit, minimally edited to ensure it compiles.

Closes #1078.
Related to #197.

docs/window.dox

@@ -287,6 +287,10 @@ __GLFW_DOUBLEBUFFER__ specifies whether the framebuffer should be double
 buffered.  You nearly always want to use double buffering.  This is a hard
 constraint.  Possible values are `GLFW_TRUE` and `GLFW_FALSE`.
 
+@anchor GLFW_TRANSPARENT_hint
+__GLFW_TRANSPARENT__ specifies whether the framebuffer will support transparency
+in the background. Possible values are `GLFW_TRUE` and `GLFW_FALSE`.
+
 
 @subsubsection window_hints_mtr Monitor related hints
 

include/GLFW/glfw3.h

@@ -787,7 +787,6 @@ extern "C" {
  *  Cursor centering [window hint](@ref GLFW_CENTER_CURSOR_hint).
  */
 #define GLFW_CENTER_CURSOR          0x00020009
-#define GLFW_TRANSPARENT            0x0002000A
 
 /*! @brief Framebuffer bit depth hint.
  *
@@ -869,6 +868,12 @@ extern "C" {
  *  Framebuffer double buffering [hint](@ref GLFW_DOUBLEBUFFER).
  */
 #define GLFW_DOUBLEBUFFER           0x00021010
+/*! @brief Framebuffer transparency hint.
+ *
+ *  Framebuffer transparency [hint](@ref GLFW_TRANSPARENT_hint).
+ */
+#define GLFW_TRANSPARENT            0x00021011
+
 /*! @brief Context client API hint and attribute.
  *
  *  Context client API [hint](@ref GLFW_CLIENT_API_hint) and

src/cocoa_window.m

@@ -1085,7 +1085,7 @@ static GLFWbool createNativeWindow(_GLFWwindow* window,
     if (wndconfig->ns.retina)
         [window->ns.view setWantsBestResolutionOpenGLSurface:YES];
 
-    if (window->transparent)
+    if (_glfw.hints.framebuffer.transparent)
     {
         [window->ns.object setOpaque:NO];
         [window->ns.object setBackgroundColor:[NSColor clearColor]];

src/egl_context.c

@@ -493,7 +493,7 @@ GLFWbool _glfwCreateContextEGL(_GLFWwindow* window,
     if (ctxconfig->share)
         share = ctxconfig->share->context.egl.handle;
 
-    if (!chooseEGLConfig(ctxconfig, fbconfig, &config, window->transparent))
+    if (!chooseEGLConfig(ctxconfig, fbconfig, &config, fbconfig->transparent))
     {
         _glfwInputError(GLFW_FORMAT_UNAVAILABLE,
                         "EGL: Failed to find a suitable EGLConfig");
@@ -738,7 +738,7 @@ GLFWbool _glfwChooseVisualEGL(const _GLFWwndconfig* wndconfig,
     EGLint visualID = 0, count = 0;
     const long vimask = VisualScreenMask | VisualIDMask;
 
-    if (!chooseEGLConfig(ctxconfig, fbconfig, &native, wndconfig->transparent))
+    if (!chooseEGLConfig(ctxconfig, fbconfig, &native, fbconfig->transparent))
     {
         _glfwInputError(GLFW_FORMAT_UNAVAILABLE,
                         "EGL: Failed to find a suitable EGLConfig");

src/glx_context.c

@@ -477,7 +477,7 @@ GLFWbool _glfwCreateContextGLX(_GLFWwindow* window,
     if (ctxconfig->share)
         share = ctxconfig->share->context.glx.handle;
 
-    if (!chooseGLXFBConfig(fbconfig, &native, window->transparent))
+    if (!chooseGLXFBConfig(fbconfig, &native, fbconfig->transparent))
     {
         _glfwInputError(GLFW_FORMAT_UNAVAILABLE,
                         "GLX: Failed to find a suitable GLXFBConfig");
@@ -665,7 +665,7 @@ GLFWbool _glfwChooseVisualGLX(const _GLFWwndconfig* wndconfig,
     GLXFBConfig native;
     XVisualInfo* result;
 
-    if (!chooseGLXFBConfig(fbconfig, &native, wndconfig->transparent))
+    if (!chooseGLXFBConfig(fbconfig, &native, fbconfig->transparent))
     {
         _glfwInputError(GLFW_FORMAT_UNAVAILABLE,
                         "GLX: Failed to find a suitable GLXFBConfig");

src/internal.h

@@ -299,7 +299,6 @@ struct _GLFWwndconfig
     GLFWbool      resizable;
     GLFWbool      visible;
     GLFWbool      decorated;
-    GLFWbool      transparent;
     GLFWbool      focused;
     GLFWbool      autoIconify;
     GLFWbool      floating;
@@ -360,6 +359,7 @@ struct _GLFWfbconfig
     int         samples;
     GLFWbool    sRGB;
     GLFWbool    doublebuffer;
+    GLFWbool    transparent;
     uintptr_t   handle;
 };
 
@@ -403,7 +403,6 @@ struct _GLFWwindow
     // Window settings and state
     GLFWbool            resizable;
     GLFWbool            decorated;
-    GLFWbool            transparent;
     GLFWbool            autoIconify;
     GLFWbool            floating;
     GLFWbool            shouldClose;

src/nsgl_context.m

@@ -296,7 +296,7 @@ GLFWbool _glfwCreateContextNSGL(_GLFWwindow* window,
         return GLFW_FALSE;
     }
 
-    if (window->transparent)
+    if (fbconfig->transparent)
     {
         GLint opaque = 0;
         [window->context.nsgl.object setValues:&opaque forParameter:NSOpenGLCPSurfaceOpacity];

src/wgl_context.c

@@ -85,7 +85,7 @@ static int choosePixelFormat(_GLFWwindow* window,
         _GLFWfbconfig* u = usableConfigs + usableCount;
         PIXELFORMATDESCRIPTOR pfd;
 
-        if (window->transparent) {
+        if (fbconfig->transparent) {
             if (!DescribePixelFormat(window->context.wgl.dc,
                 n,
                 sizeof(PIXELFORMATDESCRIPTOR),
@@ -168,7 +168,7 @@ static int choosePixelFormat(_GLFWwindow* window,
         {
             // Get pixel format attributes through legacy PFDs
 
-            if (!window->transparent && DescribePixelFormat(window->context.wgl.dc,
+            if (!fbconfig->transparent && DescribePixelFormat(window->context.wgl.dc,
                                      n,
                                      sizeof(PIXELFORMATDESCRIPTOR),
                                      &pfd))
@@ -217,8 +217,7 @@ static int choosePixelFormat(_GLFWwindow* window,
     }
     // Reiterate the selection loop without looking for transparency supporting
     // formats if no matching pixelformat for a transparent window were found.
-    if (window->transparent && !usableCount) {
-        window->transparent = GLFW_FALSE;
+    if (fbconfig->transparent && !usableCount) {
         free(usableConfigs);
         _glfwInputError(GLFW_PLATFORM_ERROR,
             "WGL: No pixel format found for transparent window. Ignoring transparency.");
@@ -803,10 +802,12 @@ GLFWbool _glfwCreateContextWGL(_GLFWwindow* window,
         }
     }
 
-    if (window->transparent)
+    if (fbconfig->transparent)
     {
         if (!setupTransparentWindow(window))
-            window->transparent = GLFW_FALSE;
+            _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
+                    "WGL: Failed to setup window as transparent as requested");
+
     }
 
     window->context.makeCurrent = makeContextCurrentWGL;

src/window.c

@@ -147,6 +147,7 @@ GLFWAPI GLFWwindow* glfwCreateWindow(int width, int height,
     fbconfig  = _glfw.hints.framebuffer;
     ctxconfig = _glfw.hints.context;
     wndconfig = _glfw.hints.window;
+    fbconfig.transparent  = _glfw.hints.framebuffer.transparent ? GLFW_TRUE : GLFW_FALSE;
 
     wndconfig.width   = width;
     wndconfig.height  = height;
@@ -180,7 +181,6 @@ GLFWAPI GLFWwindow* glfwCreateWindow(int width, int height,
     window->monitor     = (_GLFWmonitor*) monitor;
     window->resizable   = wndconfig.resizable;
     window->decorated   = wndconfig.decorated;
-    window->transparent = wndconfig.transparent;
     window->autoIconify = wndconfig.autoIconify;
     window->floating    = wndconfig.floating;
     window->cursorMode  = GLFW_CURSOR_NORMAL;
@@ -250,7 +250,6 @@ void glfwDefaultWindowHints(void)
     _glfw.hints.window.resizable   = GLFW_TRUE;
     _glfw.hints.window.visible     = GLFW_TRUE;
     _glfw.hints.window.decorated   = GLFW_TRUE;
-    _glfw.hints.window.transparent = GLFW_FALSE;
     _glfw.hints.window.focused     = GLFW_TRUE;
     _glfw.hints.window.autoIconify = GLFW_TRUE;
 
@@ -317,6 +316,9 @@ GLFWAPI void glfwWindowHint(int hint, int value)
         case GLFW_DOUBLEBUFFER:
             _glfw.hints.framebuffer.doublebuffer = value ? GLFW_TRUE : GLFW_FALSE;
             return;
+        case GLFW_TRANSPARENT:
+            _glfw.hints.framebuffer.transparent = value ? GLFW_TRUE : GLFW_FALSE;
+            return;
         case GLFW_SAMPLES:
             _glfw.hints.framebuffer.samples = value;
             return;
@@ -329,9 +331,6 @@ GLFWAPI void glfwWindowHint(int hint, int value)
         case GLFW_DECORATED:
             _glfw.hints.window.decorated = value ? GLFW_TRUE : GLFW_FALSE;
             return;
-        case GLFW_TRANSPARENT:
-            _glfw.hints.window.transparent = value ? GLFW_TRUE : GLFW_FALSE;
-            return;
         case GLFW_FOCUSED:
             _glfw.hints.window.focused = value ? GLFW_TRUE : GLFW_FALSE;
             return;
@@ -733,8 +732,6 @@ GLFWAPI int glfwGetWindowAttrib(GLFWwindow* handle, int attrib)
             return window->resizable;
         case GLFW_DECORATED:
             return window->decorated;
-        case GLFW_TRANSPARENT:
-            return window->transparent;
         case GLFW_FLOATING:
             return window->floating;
         case GLFW_AUTO_ICONIFY: