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@@ -0,0 +1,39 @@
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+#version 100
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+
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+precision mediump float;
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+
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+// Input vertex attributes (from vertex shader)
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+varying vec2 fragTexCoord; // Texture coordinates (sampler2D)
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+varying vec4 fragColor; // Tint color
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+
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+// Uniform inputs
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+uniform vec2 resolution; // Viewport resolution (in pixels)
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+uniform vec2 mouse; // Mouse pixel xy coordinates
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+uniform float time; // Total run time (in secods)
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+
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+// Draw circle
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+vec4 DrawCircle(vec2 fragCoord, vec2 position, float radius, vec3 color)
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+{
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+ float d = length(position - fragCoord) - radius;
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+ float t = clamp(d, 0.0, 1.0);
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+ return vec4(color, 1.0 - t);
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+}
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+
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+void main()
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+{
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+ vec2 fragCoord = gl_FragCoord.xy;
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+ vec2 position = vec2(mouse.x, resolution.y - mouse.y);
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+ float radius = 40.0;
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+
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+ // Draw background layer
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+ vec4 colorA = vec4(0.2,0.2,0.8, 1.0);
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+ vec4 colorB = vec4(1.0,0.7,0.2, 1.0);
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+ vec4 layer1 = mix(colorA, colorB, abs(sin(time*0.1)));
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+
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+ // Draw circle layer
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+ vec3 color = vec3(0.9, 0.16, 0.21);
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+ vec4 layer2 = DrawCircle(fragCoord, position, radius, color);
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+
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+ // Blend the two layers
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+ gl_FragColor = mix(layer1, layer2, layer2.a);
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+}
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Ray