OpenGL (Haiku): add support

src/detection/opengl/opengl_haiku.cpp

@@ -0,0 +1,38 @@
+#include <OpenGLKit.h>
+
+extern "C" {
+#include "opengl.h"
+#include "common/io/io.h"
+#if FF_HAVE_EGL
+const char* ffOpenGLDetectByEGL(FFOpenGLResult* result);
+#endif
+void ffOpenGLHandleResult(FFOpenGLResult* result, __typeof__(&glGetString) ffglGetString);
+}
+
+static const char* oglDetectOpenGL(FFOpenGLResult* result)
+{
+    BApplication app("application/x-vnd.fastfetch-cli-fastfetch");
+    FF_SUPPRESS_IO();
+
+    BGLView glView(BRect(), "ff_ogl_view", B_FOLLOW_NONE, B_WILL_DRAW, BGL_RGB);
+    auto ffglGetString = (decltype(&glGetString)) glView.GetGLProcAddress("glGetString");
+    if (!ffglGetString) return "glView.GetGLProcAddress() failed";
+    ffOpenGLHandleResult(result, ffglGetString);
+    return NULL;
+}
+
+const char* ffDetectOpenGL(FFOpenGLOptions* options, FFOpenGLResult* result)
+{
+    if (options->library == FF_OPENGL_LIBRARY_AUTO)
+        return oglDetectOpenGL(result);
+    else if (options->library == FF_OPENGL_LIBRARY_EGL)
+    {
+        #if FF_HAVE_EGL
+        return ffOpenGLDetectByEGL(result);
+        #else
+        return "fastfetch was compiled without egl support";
+        #endif
+    }
+    else
+        return "Unsupported OpenGL library";
+}