Graph Shader Simplification, 'a'/'b' redefined; GraphUI 2-pass demo;

Graph Shader Simplification

  - remove enable factor and 2nd 'discard' branch

  - use build-in 'max'/'clamp' functions, supposed to be faster

Graph Shader 'a'/'b' redefined

  - 'a' is 1-pass shader only

  - 'b' is 2-pass incl. (1st pass + 2nd pass)
    - Works well on ARM Mali-400 MP (Galaxy S2).
    - Doesn't work on NV tegra2 (P1202: Texture's gl states do not match with shader's),
      however 2-pass on mobile seems to be overkill for now.
      We may create a workaround (switch shader ..).

GraphUI 2-pass demo;
  - Propagate renderModes and texSize to UIShape's render(..)
  - TODO: Remove GL dependency in UIShape, maybe use a callback or visitor model
  - Adding GarpUI 2-pass launcher (Android and Standalone)

1 files changed, 18 insertions, 29 deletions

diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01a-xxx.fp b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01a-xxx.fp
index b51ec5808..f3a88adef 100644
--- a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01a-xxx.fp
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01a-xxx.fp
@@ -1,51 +1,40 @@
 //Copyright 2010 JogAmp Community. All rights reserved.
 
+//
+// 1-pass shader w/o weight
+//
+
 #include uniforms.glsl
 #include varyings.glsl
 
-const vec3 b_color = vec3(1.0, 1.0, 1.0);
-const vec4 tex_weights = vec4(0.075, 0.06, 0.045, 0.025);
-
 void main (void)
 {
     vec2 rtex = vec2(abs(gcv_TexCoord.x),abs(gcv_TexCoord.y));
     vec3 c = gcu_ColorStatic.rgb;
     
     float alpha = 0.0;
-    float enable = 1.0;
     
     if((gcv_TexCoord.x == 0.0) && (gcv_TexCoord.y == 0.0)) {
          alpha = gcu_Alpha;
     }
     else if ((gcv_TexCoord.x > 0.0) && (rtex.y > 0.0 || rtex.x == 1.0)) {
-        vec2 dtx = dFdx(rtex);
-        vec2 dty = dFdy(rtex);
-          
         rtex.y -= 0.1;
           
-        if(rtex.y < 0.0) {
-            if(gcv_TexCoord.y < 0.0) {
-                // discard; // freezes NV tegra2 compiler (TODO: dbl check)
-                enable = 0.0;
-            } else {
-                rtex.y = 0.0;
-            }
-        }
-          
-        vec2 f = vec2((dtx.y - dtx.x + 2.0*rtex.x*dtx.x), (dty.y - dty.x + 2.0*rtex.x*dty.x));
-        float position = rtex.y - (rtex.x * (1.0 - rtex.x));
-        float d = position/(length(f));
-
-        float a = (0.5 - d * sign(gcv_TexCoord.y));  
-        
-        if (a >= 1.0)  { 
-            alpha = gcu_Alpha * enable;
-        } else if (a <= 0.0) {
-            // discard; // freezes NV tegra2 compiler (TODO: dbl check)
+        if(rtex.y < 0.0 && gcv_TexCoord.y < 0.0) {
+            // discard; // freezes NV tegra2 compiler
             alpha = 0.0;
-        } else {           
-            alpha = gcu_Alpha * a * enable;
-            // ?? mix(b_color,gcu_ColorStatic.rgb, a);
+        } else {
+            rtex.y = max(rtex.y, 0.0);
+
+            vec2 dtx = dFdx(rtex);
+            vec2 dty = dFdy(rtex);
+              
+            vec2 f = vec2((dtx.y - dtx.x + 2.0*rtex.x*dtx.x), (dty.y - dty.x + 2.0*rtex.x*dty.x));
+            float position = rtex.y - (rtex.x * (1.0 - rtex.x));
+
+            // FIXME: will we ever set gcu_Alpha != 1.0 ? If not, a==alpha!
+            float a = clamp(0.5 - ( position/length(f) ) * sign(gcv_TexCoord.y), 0.0, 1.0);
+            alpha = gcu_Alpha * a;
         }
     }