Entire project

res/shaders/s2le/frag.gls

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+#version 330 core
+
+uniform sampler2D sampler;
+
+uniform vec4 color1 = vec4(0, 1, 1, 1);
+uniform vec4 color2 = vec4(0, 0, 1, 1);
+uniform float time = 0, freq = 1;
+uniform bool rgb = true, loop = false, textured = false;
+
+in vec2 iTexCoords;
+in float percent;
+
+out vec4 color;
+
+vec4 hsvToRgb(vec4 hsva);
+
+void main() {
+	vec4 tcolor;
+	if(textured)
+		tcolor = texture(sampler, iTexCoords);
+	if(!textured || tcolor.xyz == vec3(1, 1, 1)) {
+		float finalPercent = mod((percent + time) * freq, 1);
+		if(loop) {
+			if(finalPercent > 0.5)
+				finalPercent = 1 - finalPercent;
+			finalPercent *= 2;		
+		}
+		vec4 interpolated = color1 + (color2 - color1) * finalPercent;
+		if(rgb)
+			color = interpolated;
+		else
+			color = hsvToRgb(interpolated);
+		if(textured)
+			color.w = texture(sampler, iTexCoords).w;
+	}
+	else if(tcolor.w != 0)
+		color = tcolor;
+	else
+		discard;
+}
+
+vec4 hsvToRgb(vec4 c) {
+    vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
+    vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
+    return vec4(c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y), c.w);
+}

res/shaders/s2le/vert.gls

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+#version 330 core
+
+uniform mat4 mvp;
+
+layout (location = 0) in vec3 vertices;
+layout (location = 1) in vec2 texCoords;
+
+out vec2 iTexCoords;
+out float percent;
+
+void main() {
+	iTexCoords = texCoords;
+	vec4 position = mvp * vec4(vertices, 1);
+	percent = (position.x + 1) / 4 - (position.y - 1) / 4;
+	gl_Position = position;
+}