Use a varying and swizzles to do something interesting

calpoly-csc471 · Oct 2, 2017 · a1a0b38 · a1a0b38
1 parent 1ffa9e3
commit a1a0b38
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diff --git a/resources/fancy_frag33.glsl b/resources/fancy_frag33.glsl
@@ -2,10 +2,18 @@
 
 uniform vec3 uColor;
 
+in vec2 fVertPos;
+
 out vec3 color;
 
 
 void main()
 {
 	color = uColor;
+
+	if (mod(fVertPos.x * 4.0, 1.0) < 0.5 || mod(fVertPos.y * 4.0, 1.0) < 0.5)
+		color *= 0.5;
+
+	if (mod(gl_FragCoord.x, 64.0) < 32.0 || mod(gl_FragCoord.y, 64.0) < 32.0)
+		color.rg = color.gr;
 }
diff --git a/resources/fancy_vert33.glsl b/resources/fancy_vert33.glsl
@@ -6,9 +6,12 @@ uniform mat4 P;
 uniform mat4 MV;
 uniform float uTime;
 
+out vec2 fVertPos;
+
 
 void main()
 {
+	fVertPos = vertPos.xy;
 	vec3 position = vertPos;
 
 	const float radius = 0.8;