Merge pull request #4 from FOSSEE/develop

merging dev into master

1 files changed, 95 insertions, 0 deletions

diff --git a/common/gal/opengl/shader.vert b/common/gal/opengl/shader.vert
new file mode 100644
index 0000000..24521a4
--- /dev/null
+++ b/common/gal/opengl/shader.vert
@@ -0,0 +1,95 @@
+/*
+ * 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>
+ *
+ * Vertex 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;
+
+// Minimum line width
+const float MIN_WIDTH = 1.0;
+
+attribute vec4 attrShaderParams;
+varying vec4 shaderParams;
+varying vec2 circleCoords;
+
+void main()
+{
+    // Pass attributes to the fragment shader
+    shaderParams = attrShaderParams;
+
+    if( shaderParams[0] == SHADER_LINE )
+    {
+        float lineWidth = shaderParams[3];
+        float worldScale = gl_ModelViewMatrix[0][0];
+
+        // Make lines appear to be at least 1 pixel wide
+        if( worldScale * lineWidth < MIN_WIDTH )
+            gl_Position = gl_ModelViewProjectionMatrix *
+                ( gl_Vertex + vec4( shaderParams.yz * MIN_WIDTH / ( worldScale * lineWidth ), 0.0, 0.0 ) );
+        else
+            gl_Position = gl_ModelViewProjectionMatrix *
+                ( gl_Vertex + vec4( shaderParams.yz, 0.0, 0.0 ) );
+    }
+    else if( ( shaderParams[0] == SHADER_STROKED_CIRCLE ) ||
+             ( shaderParams[0] == SHADER_FILLED_CIRCLE  ) )
+    {
+        // Compute relative circle coordinates basing on indices
+        // Circle
+        if( shaderParams[1] == 1.0 )
+            circleCoords = vec2( -sqrt( 3.0 ), -1.0 );
+        else if( shaderParams[1] == 2.0 )
+            circleCoords = vec2( sqrt( 3.0 ), -1.0 );
+        else if( shaderParams[1] == 3.0 )
+            circleCoords = vec2( 0.0, 2.0 );
+
+        // Semicircle
+        else if( shaderParams[1] == 4.0 )
+            circleCoords = vec2( -3.0 / sqrt( 3.0 ), 0.0 );
+        else if( shaderParams[1] == 5.0 )
+            circleCoords = vec2( 3.0 / sqrt( 3.0 ), 0.0 );
+        else if( shaderParams[1] == 6.0 )
+            circleCoords = vec2( 0.0, 2.0 );
+
+        // Make the line appear to be at least 1 pixel wide
+        float lineWidth = shaderParams[3];
+        float worldScale = gl_ModelViewMatrix[0][0];
+
+        if( worldScale * lineWidth < MIN_WIDTH )
+            shaderParams[3] = shaderParams[3] / ( worldScale * lineWidth );
+
+        gl_Position = ftransform();
+    }
+    else
+    {
+        // Pass through the coordinates like in the fixed pipeline
+        gl_Position = ftransform();
+    }
+
+    gl_FrontColor = gl_Color;
+}