From http://www.jwz.org/xscreensaver/xscreensaver-5.31.tar.gz

[xscreensaver] / android / XScreenSaverGLView.c

diff --git a/android/XScreenSaverGLView.c b/android/XScreenSaverGLView.c
new file mode 100644 (file)
index 0000000..6ffecd9
--- /dev/null
+++ b/android/XScreenSaverGLView.c
@@ -0,0 +1,79 @@
+#include <android/log.h>
+#include "screenhackI.h"
+#include "xlockmoreI.h"
+
+#if defined(USE_IPHONE) || (HAVE_ANDROID)
+# include "jwzgles.h"
+#else
+# include <OpenGL/OpenGL.h>
+#endif
+
+/* used by the OpenGL screen savers
+ */
+extern GLXContext *init_GL (ModeInfo *);
+extern void glXSwapBuffers (Display *, Window);
+extern void glXMakeCurrent (Display *, Window, GLXContext);
+extern void clear_gl_error (void);
+extern void check_gl_error (const char *type);
+
+/* Does nothing - prepareContext already did the work.
+ */
+void
+glXMakeCurrent (Display *dpy, Window window, GLXContext context)
+{
+}
+
+
+/* clear away any lingering error codes */
+void
+clear_gl_error (void)
+{
+  while (glGetError() != GL_NO_ERROR)
+    ;
+}
+
+
+// needs to be implemented in Android...
+/* Copy the back buffer to the front buffer.
+ */
+void
+glXSwapBuffers (Display *dpy, Window window)
+{
+}
+
+
+/* Called by OpenGL savers using the XLockmore API.
+ */
+GLXContext *
+init_GL (ModeInfo *mi)
+{
+  Window win = mi->window;
+}
+
+/* report a GL error. */
+void
+check_gl_error (const char *type)
+{
+  char buf[100];
+  GLenum i;
+  const char *e;
+  switch ((i = glGetError())) {
+    case GL_NO_ERROR: return;
+    case GL_INVALID_ENUM:          e = "invalid enum";      break;
+    case GL_INVALID_VALUE:         e = "invalid value";     break;
+    case GL_INVALID_OPERATION:     e = "invalid operation"; break;
+    case GL_STACK_OVERFLOW:        e = "stack overflow";    break;
+    case GL_STACK_UNDERFLOW:       e = "stack underflow";   break;
+    case GL_OUT_OF_MEMORY:         e = "out of memory";     break;
+#ifdef GL_TABLE_TOO_LARGE_EXT
+    case GL_TABLE_TOO_LARGE_EXT:   e = "table too large";   break;
+#endif
+#ifdef GL_TEXTURE_TOO_LARGE_EXT
+    case GL_TEXTURE_TOO_LARGE_EXT: e = "texture too large"; break;
+#endif
+    default:
+      e = buf; sprintf (buf, "unknown GL error %d", (int) i); break;
+  }
+  __android_log_write(ANDROID_LOG_ERROR, "xscreensaver", e);
+}
+