summaryrefslogtreecommitdiffstats
path: root/libdimensionxx/gl.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'libdimensionxx/gl.cpp')
-rw-r--r--libdimensionxx/gl.cpp72
1 files changed, 72 insertions, 0 deletions
diff --git a/libdimensionxx/gl.cpp b/libdimensionxx/gl.cpp
new file mode 100644
index 0000000..5c0a7bb
--- /dev/null
+++ b/libdimensionxx/gl.cpp
@@ -0,0 +1,72 @@
+/*************************************************************************
+ * 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/>. *
+ *************************************************************************/
+
+#include "dimensionxx.hpp"
+#include <cstdio>
+
+namespace Dimension
+{
+ GL_Drawer::GL_Drawer(Canvas& canvas)
+ : m_canvas(&canvas), m_drawn(false)
+ {
+ // Optimize the canvas for GL drawing
+ dmnsn_gl_optimize_canvas(m_canvas->dmnsn());
+ }
+
+ // Draw the canvas if it hasn't been drawn yet
+ GL_Drawer::~GL_Drawer()
+ {
+ if (!m_drawn) {
+ try {
+ draw();
+ } catch (...) {
+ dmnsn_error(SEVERITY_MEDIUM,
+ "Drawing canvas to GL failed in GL_Drawer destructor.");
+ }
+ }
+ }
+
+ // Draw the canvas to the current openGL buffer
+ void GL_Drawer::draw()
+ {
+ // Draw to the GL buffer
+ if (dmnsn_gl_write_canvas(m_canvas->dmnsn()) != 0) {
+ // The drawing operation failed
+ throw Dimension_Error("Drawing canvas to GL failed.");
+ }
+
+ m_drawn = true; // Don't draw again in destructor
+ }
+
+ // Read a canvas from a GL buffer
+ Canvas
+ GL_Reader::read(unsigned int x0, unsigned int y0,
+ unsigned int width, unsigned int height)
+ {
+ // Read the canvas from the GL buffer
+ dmnsn_canvas* canvas = dmnsn_gl_read_canvas(x0, y0, width, height);
+ if (!canvas) {
+ // The read operation failed
+ throw Dimension_Error("Reading canvas from GL failed.");
+ }
+
+ return Canvas(canvas);
+ }
+}