declare function in other platform headers

src/cocoa_platform.h

@@ -247,6 +247,7 @@ void _glfwSetWindowFloatingCocoa(_GLFWwindow* window, GLFWbool enabled);
 float _glfwGetWindowOpacityCocoa(_GLFWwindow* window);
 void _glfwSetWindowOpacityCocoa(_GLFWwindow* window, float opacity);
 void _glfwSetWindowMousePassthroughCocoa(_GLFWwindow* window, GLFWbool enabled);
+GLFWbool _glfwGetWindowIsFullscreenCocoa(_GLFWwindow* window);
 
 void _glfwSetRawMouseMotionCocoa(_GLFWwindow *window, GLFWbool enabled);
 GLFWbool _glfwRawMouseMotionSupportedCocoa(void);

src/null_platform.h

@@ -243,6 +243,8 @@ void _glfwSetWindowResizableNull(_GLFWwindow* window, GLFWbool enabled);
 void _glfwSetWindowDecoratedNull(_GLFWwindow* window, GLFWbool enabled);
 void _glfwSetWindowFloatingNull(_GLFWwindow* window, GLFWbool enabled);
 void _glfwSetWindowMousePassthroughNull(_GLFWwindow* window, GLFWbool enabled);
+GLFWbool _glfwGetWindowIsFullscreenNull(_GLFWwindow* window);
+
 float _glfwGetWindowOpacityNull(_GLFWwindow* window);
 void _glfwSetWindowOpacityNull(_GLFWwindow* window, float opacity);
 void _glfwSetRawMouseMotionNull(_GLFWwindow *window, GLFWbool enabled);

src/null_window.c

@@ -408,6 +408,11 @@ void _glfwSetWindowMousePassthroughNull(_GLFWwindow* window, GLFWbool enabled)
 {
 }
 
+GLFWbool _glfwGetWindowIsFullscreenNull(_GLFWwindow* window)
+{
+    return 0;
+}
+
 float _glfwGetWindowOpacityNull(_GLFWwindow* window)
 {
     return window->null.opacity;

src/win32_platform.h

@@ -573,6 +573,7 @@ void _glfwSetWindowResizableWin32(_GLFWwindow* window, GLFWbool enabled);
 void _glfwSetWindowDecoratedWin32(_GLFWwindow* window, GLFWbool enabled);
 void _glfwSetWindowFloatingWin32(_GLFWwindow* window, GLFWbool enabled);
 void _glfwSetWindowMousePassthroughWin32(_GLFWwindow* window, GLFWbool enabled);
+GLFWbool _glfwGetWindowIsFullscreenWin32(_GLFWwindow* window);
 float _glfwGetWindowOpacityWin32(_GLFWwindow* window);
 void _glfwSetWindowOpacityWin32(_GLFWwindow* window, float opacity);
 

src/wl_platform.h

@@ -648,6 +648,7 @@ void _glfwSetWindowFloatingWayland(_GLFWwindow* window, GLFWbool enabled);
 float _glfwGetWindowOpacityWayland(_GLFWwindow* window);
 void _glfwSetWindowOpacityWayland(_GLFWwindow* window, float opacity);
 void _glfwSetWindowMousePassthroughWayland(_GLFWwindow* window, GLFWbool enabled);
+GLFWbool _glfwGetWindowIsFullscreenWayland(_GLFWwindow* window);
 
 void _glfwSetRawMouseMotionWayland(_GLFWwindow* window, GLFWbool enabled);
 GLFWbool _glfwRawMouseMotionSupportedWayland(void);