Merge pull request #4 from FOSSEE/develop

merging dev into master

1 files changed, 75 insertions, 0 deletions

diff --git a/common/gal/opengl/shader.frag b/common/gal/opengl/shader.frag
new file mode 100644
index 0000000..7d7d96c
--- /dev/null
+++ b/common/gal/opengl/shader.frag
@@ -0,0 +1,75 @@
+/*
+ * This program source code file is part of KICAD, a free EDA CAD application.
+ *
+ * Copyright (C) 2013 CERN
+ * @author Maciej Suminski <maciej.suminski@cern.ch>
+ *
+ * Fragment shader
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#version 120
+
+// Shader types
+const float SHADER_LINE                 = 1.0;
+const float SHADER_FILLED_CIRCLE        = 2.0;
+const float SHADER_STROKED_CIRCLE       = 3.0;
+
+varying vec4 shaderParams;
+varying vec2 circleCoords;
+
+void filledCircle( vec2 aCoord )
+{
+    if( dot( aCoord, aCoord ) < 1.0 )
+        gl_FragColor = gl_Color;
+    else
+        discard;
+}
+
+
+void strokedCircle( vec2 aCoord, float aRadius, float aWidth )
+{
+    float outerRadius = aRadius + ( aWidth / 2 );
+    float innerRadius = aRadius - ( aWidth / 2 );
+    float relWidth = innerRadius / outerRadius;
+
+    if( ( dot( aCoord, aCoord ) < 1.0 ) &&
+        ( dot( aCoord, aCoord ) > relWidth * relWidth ) )
+        gl_FragColor = gl_Color;
+    else
+        discard;
+}
+
+
+void main()
+{
+    if( shaderParams[0] == SHADER_FILLED_CIRCLE )
+    {
+        filledCircle( circleCoords );
+    }
+    else if( shaderParams[0] == SHADER_STROKED_CIRCLE )
+    {
+        strokedCircle( circleCoords, shaderParams[2], shaderParams[3] );
+    }
+    else
+    {
+        // Simple pass-through
+        gl_FragColor = gl_Color;
+    }
+}