1 files changed, 37 insertions, 0 deletions
diff --git a/packages/noncvs/windows/extra/Gem/examples/10.glsl/normal.frag b/packages/noncvs/windows/extra/Gem/examples/10.glsl/normal.frag
new file mode 100644
index 00000000..eef7f86f
--- /dev/null
+++ b/packages/noncvs/windows/extra/Gem/examples/10.glsl/normal.frag
@@ -0,0 +1,37 @@
+// Cyrille Henry 2008
+#extension GL_ARB_texture_rectangle : enable
+
+uniform sampler2DRect texture_mass;
+varying vec2 coord;
+
+vec2 test1(vec2 V)
+{
+	return(max(min(V,vec2(91.,63.)),vec2(0.)));
+}
+
+void main (void)
+{
+	vec4 color = vec4(1.,0.,0.,1.);
+
+	if ( (coord.x < 91.) && (coord.y <  63.) )
+	{
+		vec4 posG = texture2DRect(texture_mass, test1(coord+vec2(-1., 0.))) ;
+		vec4 posD = texture2DRect(texture_mass, test1(coord+vec2( 1., 0.))) ;
+		vec4 posH = texture2DRect(texture_mass, test1(coord+vec2( 0.,-1.))) ;
+		vec4 posB = texture2DRect(texture_mass, test1(coord+vec2( 0., 1.))) ;
+	
+		vec3 normal = cross((posG.xyz-posD.xyz),(posH.xyz-posB.xyz));
+		color.xyz = normalize(normal);
+		color.xyz = normal;
+
+        vec3 DX = posG.xyz-posD.xyz;
+        vec3 DY = posH.xyz-posB.xyz;
+
+		color += vec4(1.);
+		color *= 0.5;
+
+	}
+	color.a = 1.;
+	gl_FragColor = color;
+
+}