[ADD] added basic clip-plane functionality to point renderer. Now only works...

[ADD] added basic clip-plane functionality to point renderer. Now only works with shader code modification. Will be extended to use properties later.

src/modules/pointRenderer/shaders/WMPointRenderer-fragment.glsl

@@ -115,7 +115,7 @@ void main()
 
     // finally set the color and depth
     wgeInitGBuffer();
-    wge_FragColor = vec4( gl_Color.rgb * r, 1.0 );
+    wge_FragColor = vec4( gl_Color.rgb * r , gl_Color.a );
     wge_FragNormal = textureNormalize( sphereSurf );
     wge_FragZoom = v_worldScale;
     wge_FragTangent = textureNormalize( vec3( 0.0, 1.0, 0.0 ) );

src/modules/pointRenderer/shaders/WMPointRenderer-geometry.glsl

@@ -50,6 +50,11 @@ uniform float u_pointSize = 1.0;
  */
 varying in vec3 v_normal[];
 
+/**
+ * Clip vertex if not 0.0
+ */
+varying in float v_clip[];
+
 /**
  * The vertex coordinates in world-space
  */
@@ -103,6 +108,12 @@ varying out float v_worldScale;
  */
 void main()
 {
+    // clip whole sprite
+    if( v_clip[0] != 0.0 )
+    {
+        return;
+    }
+
     // grab the info we got from the vertex array:
     vec3 vertex = gl_PositionIn[0].xyz;
 

src/modules/pointRenderer/shaders/WMPointRenderer-vertex.glsl

@@ -38,6 +38,8 @@
 // Varyings
 /////////////////////////////////////////////////////////////////////////////
 
+varying float v_clip ;
+
 /////////////////////////////////////////////////////////////////////////////
 // Variables
 /////////////////////////////////////////////////////////////////////////////
@@ -51,6 +53,11 @@
  */
 void main()
 {
+    // use clipping planes to cut away parts
+    v_clip = 0.0;
+    // TODO(ebaum): implement this using proper clip-plane implementation
+    // v_clip = float((  gl_Vertex.x > 500. ) || (gl_Vertex.y>500.) );
+
     // forward to geometry shader
     gl_FrontColor = gl_Color;
     gl_Position = gl_ModelViewMatrix * gl_Vertex;