X11: Fix sonames for loaded libraries on OpenBSD

The OpenBSD ports tree assigns its own soname version numbers, so the
hardcoded sonames GLFW uses to load libraries on non-macOS Unices are
often incorrect.  Instead OpenBSD recommends that run-time loading
should leave out the version numbers entirely.  The OpenBSD ld.so then
finds the correct library.

This upstreams the ports tree fixes for Xcursor and EGL, and adds the
corresponding fix for all other run-time loaded library sonames.

Tested on OpenBSD 7.0.

This issue was initially reported on IRC.

README.md

@@ -264,6 +264,7 @@ information on what to include when reporting a bug.
  - [X11] Bugfix: Changing `GLFW_FLOATING` could leak memory
  - [X11] Bugfix: Icon pixel format conversion worked only by accident, relying on
    undefined behavior (#1986)
+ - [X11] Bugfix: Dynamic loading on OpenBSD failed due to soname differences
  - [Wayland] Added dynamic loading of all Wayland libraries
  - [Wayland] Removed support for `wl_shell` (#1443)
  - [Wayland] Bugfix: The `GLFW_HAND_CURSOR` shape used the wrong image (#1432)

src/egl_context.c

@@ -325,6 +325,8 @@ GLFWbool _glfwInitEGL(void)
         "libEGL.dylib",
 #elif defined(__CYGWIN__)
         "libEGL-1.so",
+#elif defined(__OpenBSD__)
+        "libEGL.so",
 #else
         "libEGL.so.1",
 #endif
@@ -700,6 +702,8 @@ GLFWbool _glfwCreateContextEGL(_GLFWwindow* window,
             "libGLES_CM.dll",
 #elif defined(_GLFW_COCOA)
             "libGLESv1_CM.dylib",
+#elif defined(__OpenBSD__)
+            "libGLESv1_CM.so",
 #else
             "libGLESv1_CM.so.1",
             "libGLES_CM.so.1",
@@ -717,6 +721,8 @@ GLFWbool _glfwCreateContextEGL(_GLFWwindow* window,
             "libGLESv2.dylib",
 #elif defined(__CYGWIN__)
             "libGLESv2-2.so",
+#elif defined(__OpenBSD__)
+            "libGLESv2.so",
 #else
             "libGLESv2.so.2",
 #endif
@@ -728,6 +734,8 @@ GLFWbool _glfwCreateContextEGL(_GLFWwindow* window,
             _GLFW_OPENGL_LIBRARY,
 #elif defined(_GLFW_WIN32)
 #elif defined(_GLFW_COCOA)
+#elif defined(__OpenBSD__)
+            "libGL.so",
 #else
             "libGL.so.1",
 #endif

src/glx_context.c

@@ -259,6 +259,8 @@ GLFWbool _glfwInitGLX(void)
         _GLFW_GLX_LIBRARY,
 #elif defined(__CYGWIN__)
         "libGL-1.so",
+#elif defined(__OpenBSD__)
+        "libGL.so",
 #else
         "libGL.so.1",
         "libGL.so",

src/osmesa_context.c

@@ -124,6 +124,8 @@ GLFWbool _glfwInitOSMesa(void)
         "libOSMesa.8.dylib",
 #elif defined(__CYGWIN__)
         "libOSMesa-8.so",
+#elif defined(__OpenBSD__)
+        "libOSMesa.so",
 #else
         "libOSMesa.so.8",
         "libOSMesa.so.6",

src/vulkan.c

@@ -63,6 +63,8 @@ GLFWbool _glfwInitVulkan(int mode)
         _glfw.vk.handle = _glfwPlatformLoadModule("libvulkan.1.dylib");
         if (!_glfw.vk.handle)
             _glfw.vk.handle = _glfwLoadLocalVulkanLoaderCocoa();
+#elif defined(__OpenBSD__)
+        _glfw.vk.handle = _glfwPlatformLoadModule("libvulkan.so");
 #else
         _glfw.vk.handle = _glfwPlatformLoadModule("libvulkan.so.1");
 #endif

src/x11_init.c

@@ -601,7 +601,11 @@ static void detectEWMH(void)
 //
 static GLFWbool initExtensions(void)
 {
+#if defined(__OpenBSD__)
+    _glfw.x11.vidmode.handle = _glfwPlatformLoadModule("libXxf86vm.so");
+#else
     _glfw.x11.vidmode.handle = _glfwPlatformLoadModule("libXxf86vm.so.1");
+#endif
     if (_glfw.x11.vidmode.handle)
     {
         _glfw.x11.vidmode.QueryExtension = (PFN_XF86VidModeQueryExtension)
@@ -621,6 +625,8 @@ static GLFWbool initExtensions(void)
 
 #if defined(__CYGWIN__)
     _glfw.x11.xi.handle = _glfwPlatformLoadModule("libXi-6.so");
+#elif defined(__OpenBSD__)
+    _glfw.x11.xi.handle = _glfwPlatformLoadModule("libXi.so");
 #else
     _glfw.x11.xi.handle = _glfwPlatformLoadModule("libXi.so.6");
 #endif
@@ -651,6 +657,8 @@ static GLFWbool initExtensions(void)
 
 #if defined(__CYGWIN__)
     _glfw.x11.randr.handle = _glfwPlatformLoadModule("libXrandr-2.so");
+#elif defined(__OpenBSD__)
+    _glfw.x11.randr.handle = _glfwPlatformLoadModule("libXrandr.so");
 #else
     _glfw.x11.randr.handle = _glfwPlatformLoadModule("libXrandr.so.2");
 #endif
@@ -743,6 +751,8 @@ static GLFWbool initExtensions(void)
 
 #if defined(__CYGWIN__)
     _glfw.x11.xcursor.handle = _glfwPlatformLoadModule("libXcursor-1.so");
+#elif defined(__OpenBSD__)
+    _glfw.x11.xcursor.handle = _glfwPlatformLoadModule("libXcursor.so");
 #else
     _glfw.x11.xcursor.handle = _glfwPlatformLoadModule("libXcursor.so.1");
 #endif
@@ -764,6 +774,8 @@ static GLFWbool initExtensions(void)
 
 #if defined(__CYGWIN__)
     _glfw.x11.xinerama.handle = _glfwPlatformLoadModule("libXinerama-1.so");
+#elif defined(__OpenBSD__)
+    _glfw.x11.xinerama.handle = _glfwPlatformLoadModule("libXinerama.so");
 #else
     _glfw.x11.xinerama.handle = _glfwPlatformLoadModule("libXinerama.so.1");
 #endif
@@ -817,6 +829,8 @@ static GLFWbool initExtensions(void)
     {
 #if defined(__CYGWIN__)
         _glfw.x11.x11xcb.handle = _glfwPlatformLoadModule("libX11-xcb-1.so");
+#elif defined(__OpenBSD__)
+        _glfw.x11.x11xcb.handle = _glfwPlatformLoadModule("libX11-xcb.so");
 #else
         _glfw.x11.x11xcb.handle = _glfwPlatformLoadModule("libX11-xcb.so.1");
 #endif
@@ -830,6 +844,8 @@ static GLFWbool initExtensions(void)
 
 #if defined(__CYGWIN__)
     _glfw.x11.xrender.handle = _glfwPlatformLoadModule("libXrender-1.so");
+#elif defined(__OpenBSD__)
+    _glfw.x11.xrender.handle = _glfwPlatformLoadModule("libXrender.so");
 #else
     _glfw.x11.xrender.handle = _glfwPlatformLoadModule("libXrender.so.1");
 #endif
@@ -857,6 +873,8 @@ static GLFWbool initExtensions(void)
 
 #if defined(__CYGWIN__)
     _glfw.x11.xshape.handle = _glfwPlatformLoadModule("libXext-6.so");
+#elif defined(__OpenBSD__)
+    _glfw.x11.xshape.handle = _glfwPlatformLoadModule("libXext.so");
 #else
     _glfw.x11.xshape.handle = _glfwPlatformLoadModule("libXext.so.6");
 #endif
@@ -1203,6 +1221,8 @@ GLFWbool _glfwConnectX11(int platformID, _GLFWplatform* platform)
 
 #if defined(__CYGWIN__)
     void* module = _glfwPlatformLoadModule("libX11-6.so");
+#elif defined(__OpenBSD__)
+    void* module = _glfwPlatformLoadModule("libX11.so");
 #else
     void* module = _glfwPlatformLoadModule("libX11.so.6");
 #endif