1 files changed, 62 insertions, 0 deletions
diff --git a/examples/09_vp_calibration/soft_edge.frag b/examples/09_vp_calibration/soft_edge.frag
new file mode 100644
index 0000000..1c2e35f
--- /dev/null
+++ b/examples/09_vp_calibration/soft_edge.frag
@@ -0,0 +1,62 @@
+// Cyrille Henry 2010
+
+//#extension GL_ARB_texture_rectangle : enable
+//uniform sampler2DRect MyTex;
+uniform sampler2D MyTex;
+uniform vec2 overlap, geometry_screen, geometry_computer;
+
+void main (void)
+{
+// FSAA
+
+// change coord from computer matrix to screen matrice
+	vec2 coord = (gl_TextureMatrix[0] * gl_TexCoord[0]).st;
+   	vec2 pos_new = coord;
+    pos_new *= geometry_computer;
+    float screen_num = floor(pos_new.x)+floor(pos_new.y)*geometry_computer.x; // number of the screen
+    pos_new = fract(pos_new); // coord in 1 screen (from 0 to 1)
+    pos_new.x += fract(screen_num/geometry_screen.x)*geometry_screen.x;
+    pos_new.y += floor(screen_num/geometry_screen.x);
+    pos_new /= geometry_screen;
+
+// compute position regarding to the overlap
+    vec2 pos = pos_new;
+    pos *= geometry_screen;
+
+    vec2 pos_over = fract(pos);
+    pos_over *= overlap;
+    pos_over -= overlap/2.;
+    pos += pos_over;
+    pos += overlap/2.;
+    pos /= geometry_screen + overlap;
+    vec4 color = texture2D(MyTex, pos);
+
+// compute fade on Top and Right
+    vec2 black = pos_new;
+    black *= geometry_screen;
+    black = fract(black);
+	black *= 1. + (overlap/ (geometry_screen/2.));
+    black -= 1.;
+    black = max(black,0.);
+	black *= (geometry_screen / 2.) / overlap;
+    if ( ( floor(pos_new.x*geometry_screen.x) < geometry_screen.x-1. ) && (overlap.x != 0.) )
+        color *= (1.-black.x);
+    if ( ( floor(pos_new.y*geometry_screen.y) < geometry_screen.y-1. ) && (overlap.x != 0.) )
+    	color *= (1.-black.y);
+
+// compute fade on Left and bottom
+    black = pos_new;
+    black *= geometry_screen;
+    black = fract(black);
+	black = vec2(1.) - black;
+	black *= 1. + (overlap/ (geometry_screen/2.));
+    black -= 1.;
+    black = max(black,0.);
+	black *= (geometry_screen / 2.) / overlap;
+    if ( ( floor(pos_new.x*geometry_screen.x) > 0. ) && (overlap.x != 0.) )
+        color *= (1.-black.x);
+    if ( ( floor(pos_new.y*geometry_screen.y) > 0. ) && (overlap.x != 0.) )
+        color *= (1.-black.y);
+
+    gl_FragColor = color;
+}