tegra2: split fragment shaders into two (a - 1st pass, b - 2nd pass) ; disabled discard

- 1st pass (a) and 2nd pass (b), split at branch.
- all include are on one level.
- disabled discard, as it seems to be problematic

Todo:
 - verify discard / pass-split on tegra2
 - refect second pass usage (b) in implementation

1 files changed, 53 insertions, 0 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
new file mode 100644
index 000000000..fba2edb64
--- /dev/null
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01a-xxx.fp
@@ -0,0 +1,53 @@
+//Copyright 2010 JogAmp Community. All rights reserved.
+
+#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;
+    
+    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) {
+            /** discard freezes NV tegra2 compiler (TODO: dbl check)
+            if(gcv_TexCoord.y < 0.0) {
+                discard;
+            } else {
+                rtex.y = 0.0;
+            }*/
+            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;
+        } else if (a <= 0.0) {
+            // discard; // freezes NV tegra2 compiler (TODO: dbl check)
+            alpha = 0.0;
+        } else {           
+            alpha = gcu_Alpha * a;
+            // ?? mix(b_color,gcu_ColorStatic.rgb, a);
+        }
+    }
+    
+    gl_FragColor = vec4(c, alpha);
+}