Make OSMesa backend an almost proper null backend

It still depends on POSIX time and TLS.

src/CMakeLists.txt

@@ -53,11 +53,10 @@ elseif (_GLFW_MIR)
                      linux_joystick.c posix_time.c posix_tls.c xkb_unicode.c
                      egl_context.c)
 elseif (_GLFW_OSMESA)
-    set(glfw_HEADERS ${common_HEADERS} osmesa_platform.h null_joystick.h
+    set(glfw_HEADERS ${common_HEADERS} null_platform.h null_joystick.h
                      posix_time.h posix_tls.h osmesa_context.h)
-    set(glfw_SOURCES ${common_SOURCES} osmesa_init.c osmesa_monitor.c
-                     osmesa_window.c null_joystick.c posix_time.c posix_tls.c
-                     osmesa_context.c)
+    set(glfw_SOURCES ${common_SOURCES} null_init.c null_monitor.c null_window.c
+                     null_joystick.c posix_time.c posix_tls.c osmesa_context.c)
 endif()
 
 if (APPLE)

src/internal.h

@@ -184,7 +184,7 @@ typedef void (APIENTRY * PFN_vkVoidFunction)(void);
 #elif defined(_GLFW_MIR)
  #include "mir_platform.h"
 #elif defined(_GLFW_OSMESA)
- #include "osmesa_platform.h"
+ #include "null_platform.h"
 #else
  #error "No supported window creation API selected"
 #endif

src/null_init.c

@@ -1,5 +1,5 @@
 //========================================================================
-// GLFW 3.3 OSMesa - www.glfw.org
+// GLFW 3.3 - www.glfw.org
 //------------------------------------------------------------------------
 // Copyright (c) 2016 Google Inc.
 // Copyright (c) 2006-2016 Camilla Löwy <elmindreda@glfw.org>
@@ -49,6 +49,6 @@ void _glfwPlatformTerminate(void)
 
 const char* _glfwPlatformGetVersionString(void)
 {
-    return _GLFW_VERSION_NUMBER " none OSMesa";
+    return _GLFW_VERSION_NUMBER " null OSMesa";
 }
 

src/null_monitor.c

@@ -1,5 +1,5 @@
 //========================================================================
-// GLFW 3.3 OSMesa - www.glfw.org
+// GLFW 3.3 - www.glfw.org
 //------------------------------------------------------------------------
 // Copyright (c) 2016 Google Inc.
 // Copyright (c) 2006-2016 Camilla Löwy <elmindreda@glfw.org>

src/null_platform.h

@@ -1,5 +1,5 @@
 //========================================================================
-// GLFW 3.3 OSMesa - www.glfw.org
+// GLFW 3.3 - www.glfw.org
 //------------------------------------------------------------------------
 // Copyright (c) 2016 Google Inc.
 // Copyright (c) 2006-2016 Camilla Löwy <elmindreda@glfw.org>
@@ -25,12 +25,12 @@
 //
 //========================================================================
 
-#ifndef _glfw3_osmesa_platform_h_
-#define _glfw3_osmesa_platform_h_
+#ifndef _glfw3_null_platform_h_
+#define _glfw3_null_platform_h_
 
 #include <dlfcn.h>
 
-#define _GLFW_PLATFORM_WINDOW_STATE _GLFWwindowOSMesa osmesa
+#define _GLFW_PLATFORM_WINDOW_STATE _GLFWwindowNull null
 
 #define _GLFW_PLATFORM_CONTEXT_STATE
 #define _GLFW_PLATFORM_MONITOR_STATE
@@ -55,13 +55,13 @@
  #define _glfw_dlsym(handle, name) dlsym(handle, name)
 #endif
 
-// OSMesa-specific per-window data
+// Null-specific per-window data
 //
-typedef struct _GLFWwindowOSMesa
+typedef struct _GLFWwindowNull
 {
     int width;
     int height;
-} _GLFWwindowOSMesa;
+} _GLFWwindowNull;
 
 
-#endif // _glfw3_osmesa_platform_h_
+#endif // _glfw3_null_platform_h_

src/null_window.c

@@ -1,5 +1,5 @@
 //========================================================================
-// GLFW 3.3 OSMesa - www.glfw.org
+// GLFW 3.3 - www.glfw.org
 //------------------------------------------------------------------------
 // Copyright (c) 2016 Google Inc.
 // Copyright (c) 2006-2016 Camilla Löwy <elmindreda@glfw.org>
@@ -31,8 +31,8 @@
 static int createNativeWindow(_GLFWwindow* window,
                               const _GLFWwndconfig* wndconfig)
 {
-    window->osmesa.width = wndconfig->width;
-    window->osmesa.height = wndconfig->height;
+    window->null.width = wndconfig->width;
+    window->null.height = wndconfig->height;
 
     return GLFW_TRUE;
 }
@@ -62,7 +62,7 @@ int _glfwPlatformCreateWindow(_GLFWwindow* window,
         }
         else
         {
-            _glfwInputError(GLFW_API_UNAVAILABLE, "OSMesa: EGL not available");
+            _glfwInputError(GLFW_API_UNAVAILABLE, "Null: EGL not available");
             return GLFW_FALSE;
         }
     }
@@ -104,15 +104,15 @@ void _glfwPlatformSetWindowPos(_GLFWwindow* window, int xpos, int ypos)
 void _glfwPlatformGetWindowSize(_GLFWwindow* window, int* width, int* height)
 {
     if (width)
-        *width = window->osmesa.width;
+        *width = window->null.width;
     if (height)
-        *height = window->osmesa.height;
+        *height = window->null.height;
 }
 
 void _glfwPlatformSetWindowSize(_GLFWwindow* window, int width, int height)
 {
-    window->osmesa.width = width;
-    window->osmesa.height = height;
+    window->null.width = width;
+    window->null.height = height;
 }
 
 void _glfwPlatformSetWindowSizeLimits(_GLFWwindow* window,
@@ -128,9 +128,9 @@ void _glfwPlatformSetWindowAspectRatio(_GLFWwindow* window, int n, int d)
 void _glfwPlatformGetFramebufferSize(_GLFWwindow* window, int* width, int* height)
 {
     if (width)
-        *width = window->osmesa.width;
+        *width = window->null.width;
     if (height)
-        *height = window->osmesa.height;
+        *height = window->null.height;
 }
 
 void _glfwPlatformGetWindowFrameSize(_GLFWwindow* window,