Graph Clipping: GLSL: Add `USE_AABBOX_CLIPPING`, i.e. clipping via AABBox min/max vec3 as convenient using Graph/GraphUI produced AABBox

USE_AABBOX_CLIPPING
- Conditional compilation w/ macro 'USE_AABBOX_CLIPPING'
- gcv_ClipBBoxCoord smooth varying setup in vertex shader
- fragment shader clips via branch
    if( is_inside(gcv_ClipBBoxCoord, gcu_ClipBBox[0], gcu_ClipBBox[1]) < 0.5 ) { CLIP }
- clipping via discard or alpha=0 in case of buggy-discard.

Other optimization:
- Drop gcv_ColorTexExt, fragment-shader uses gcu_ColorTexBBox[2] directly (flat)
- Simplified gcv_ColorTexCoord smooth varying equation in vertex shader.

1 files changed, 6 insertions, 4 deletions

diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-single.vp b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-single.vp
index 919b526df..aebf8c147 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-single.vp
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-single.vp
@@ -1,4 +1,4 @@
-//Copyright 2010 JogAmp Community. All rights reserved.
+// Copyright 2010-2024 JogAmp Community. All rights reserved.
 
 #if __VERSION__ >= 130
   #define attribute in
@@ -23,10 +23,12 @@ void main(void)
         gcv_CurveParam = gca_CurveParams;
     }
 #endif
+#ifdef USE_AABBOX_CLIPPING
+    gcv_ClipBBoxCoord = gca_Vertices.xyz;
+#endif    
+    
 #ifdef USE_COLOR_TEXTURE
-    vec2 dim = vec2(gcu_ColorTexBBox[1].x - gcu_ColorTexBBox[0].x, gcu_ColorTexBBox[1].y - gcu_ColorTexBBox[0].y);
-    gcv_ColorTexCoord = vec2(gca_Vertices.x - gcu_ColorTexBBox[0].x, gca_Vertices.y - gcu_ColorTexBBox[0].y) / dim;
-    gcv_ColorTexExt = gcu_ColorTexBBox[2]; // texture-size
+    gcv_ColorTexCoord = ( gca_Vertices.xy - gcu_ColorTexBBox[0] ) / ( gcu_ColorTexBBox[1] - gcu_ColorTexBBox[0] );
 #endif
 #ifdef USE_COLOR_CHANNEL
     gcv_Color = gca_Colors;