Made glfwGetPrimaryMonitor always return a handle.

Replaced the primary flag with the convention of putting the primary
monitor first in the returned array.

src/cocoa_monitor.m

@@ -244,6 +244,17 @@ _GLFWmonitor** _glfwPlatformGetMonitors(int* count)
 
     free(displays);
 
+    for (i = 0;  i < monitorCount;  i++)
+    {
+        if (CGDisplayIsMain(monitors[i]->ns.displayID))
+        {
+            _GLFWmonitor* temp = monitors[0];
+            monitors[0] = monitors[i];
+            monitors[i] = temp;
+            break;
+        }
+    }
+
     *count = monitorCount;
     return monitors;
 }

src/internal.h

@@ -257,8 +257,6 @@ struct _GLFWmonitor
 {
     char*           name;
 
-    GLboolean       primary;
-
     // Physical dimensions in millimeters.
     int             widthMM, heightMM;
     // Logical orientation of the screen on the desktop
@@ -686,7 +684,6 @@ GLboolean _glfwIsValidContext(_GLFWwndconfig* wndconfig);
 /*! @ingroup utility
  */
 _GLFWmonitor* _glfwCreateMonitor(const char* name,
-                                 GLboolean primary,
                                  int widthMM, int heightMM,
                                  int x, int y);
 

src/monitor.c

@@ -156,7 +156,6 @@ void _glfwInputMonitorChange(void)
 //////////////////////////////////////////////////////////////////////////
 
 _GLFWmonitor* _glfwCreateMonitor(const char* name,
-                                 GLboolean primary,
                                  int widthMM, int heightMM,
                                  int x, int y)
 {
@@ -168,7 +167,6 @@ _GLFWmonitor* _glfwCreateMonitor(const char* name,
     }
 
     monitor->name = strdup(name);
-    monitor->primary = primary;
     monitor->widthMM = widthMM;
     monitor->heightMM = heightMM;
     monitor->positionX = x;
@@ -280,31 +278,13 @@ GLFWAPI GLFWmonitor** glfwGetMonitors(int* count)
 
 GLFWAPI GLFWmonitor* glfwGetPrimaryMonitor(void)
 {
-    int i;
-    _GLFWmonitor* primary = NULL;
-
     if (!_glfwInitialized)
     {
         _glfwInputError(GLFW_NOT_INITIALIZED, NULL);
         return NULL;
     }
 
-    for (i = 0;  i < _glfw.monitorCount;  i++)
-    {
-        if (_glfw.monitors[i]->primary)
-        {
-            primary = _glfw.monitors[i];
-            break;
-        }
-    }
-
-    if (!primary)
-    {
-        _glfwInputError(GLFW_PLATFORM_ERROR, NULL);
-        return NULL;
-    }
-
-    return (GLFWmonitor*) primary;
+    return (GLFWmonitor*) _glfw.monitors[0];
 }
 
 GLFWAPI void glfwGetMonitorPos(GLFWmonitor* handle, int* xpos, int* ypos)

src/win32_monitor.c

@@ -102,6 +102,7 @@ _GLFWmonitor** _glfwPlatformGetMonitors(int* count)
     int size = 0, found = 0;
     _GLFWmonitor** monitors = NULL;
     DWORD adapterIndex = 0;
+    int primaryIndex = 0;
 
     for (;;)
     {
@@ -111,7 +112,6 @@ _GLFWmonitor** _glfwPlatformGetMonitors(int* count)
         DEVMODE settings;
         char* name;
         HDC dc;
-        GLboolean primary;
 
         ZeroMemory(&adapter, sizeof(DISPLAY_DEVICE));
         adapter.cb = sizeof(DISPLAY_DEVICE);
@@ -156,7 +156,8 @@ _GLFWmonitor** _glfwPlatformGetMonitors(int* count)
         EnumDisplayDevices(adapter.DeviceName, 0, &display, 0);
         dc = CreateDC(L"DISPLAY", display.DeviceString, NULL, NULL);
 
-        primary = adapter.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE;
+        if (adapter.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE)
+            primaryIndex = found;
 
         name = _glfwCreateUTF8FromWideString(display.DeviceString);
         if (!name)
@@ -165,7 +166,7 @@ _GLFWmonitor** _glfwPlatformGetMonitors(int* count)
             return NULL;
         }
 
-        monitors[found] = _glfwCreateMonitor(name, primary,
+        monitors[found] = _glfwCreateMonitor(name,
                                              GetDeviceCaps(dc, HORZSIZE),
                                              GetDeviceCaps(dc, VERTSIZE),
                                              settings.dmPosition.x,
@@ -184,6 +185,13 @@ _GLFWmonitor** _glfwPlatformGetMonitors(int* count)
         found++;
     }
 
+    if (primaryIndex > 0)
+    {
+        _GLFWmonitor* temp = monitors[0];
+        monitors[0] = monitors[primaryIndex];
+        monitors[primaryIndex] = temp;
+    }
+
     *count = found;
     return monitors;
 }

src/x11_monitor.c

@@ -193,7 +193,6 @@ _GLFWmonitor** _glfwPlatformGetMonitors(int* found)
             }
 
             monitors[*found] = _glfwCreateMonitor(oi->name,
-                                                  output == primary,
                                                   oi->mm_width, oi->mm_height,
                                                   ci->x, ci->y);
 
@@ -207,6 +206,17 @@ _GLFWmonitor** _glfwPlatformGetMonitors(int* found)
         }
 
         XRRFreeScreenResources(sr);
+
+        for (i = 0;  i < *found;  i++)
+        {
+            if (monitors[i]->x11.output == primary)
+            {
+                _GLFWmonitor* temp = monitors[0];
+                monitors[0] = monitors[i];
+                monitors[i] = temp;
+                break;
+            }
+        }
     }
     else
     {
@@ -222,11 +232,7 @@ _GLFWmonitor** _glfwPlatformGetMonitors(int* found)
         widthMM  = DisplayWidthMM(_glfw.x11.display, _glfw.x11.screen);
         heightMM = DisplayHeightMM(_glfw.x11.display, _glfw.x11.screen);
 
-        monitors[0] = _glfwCreateMonitor("Display",
-                                         GL_TRUE,
-                                         widthMM, heightMM,
-                                         0, 0);
-
+        monitors[0] = _glfwCreateMonitor("Display", widthMM, heightMM, 0, 0);
         *found = 1;
     }