Provide interface to export canvas to openGL.

1 files changed, 37 insertions, 0 deletions

diff --git a/libdimension/dimension/gl.h b/libdimension/dimension/gl.h
new file mode 100644
index 0000000..e27c418
--- /dev/null
+++ b/libdimension/dimension/gl.h
@@ -0,0 +1,37 @@
+/*************************************************************************
+ * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com>               *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library is free software; you can redistribute it and/  *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension Library is distributed in the hope that it will be      *
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty   *
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+/*
+ * Draw a canvas to a GL framebuffer with glDrawPixels, or read one with
+ * glReadPixels.  Should be fast, so no _async() versions.
+ */
+
+#ifndef DIMENSION_GL_H
+#define DIMENSION_GL_H
+
+#include <stdio.h>
+
+/* Write canvas to GL framebuffer.  Returns 0 on success, nonzero on failure */
+int dmnsn_gl_write_canvas(const dmnsn_canvas *canvas);
+
+/* Read a canvas from a GL framebuffer.  Returns NULL on failure. */
+dmnsn_canvas *dmnsn_gl_read_canvas();
+
+#endif /* DIMENSION_GL_H */