Add dynamic ChronoVortexRenderable.

glsl/postprocess_textured.vert

@@ -0,0 +1,14 @@
+#version {VERSION}
+
+uniform vec2 Pos, Scroll;
+uniform vec2 p1, p2;
+
+in vec2 aVertexPosition;
+in vec2 aVertexTexCoord;
+out vec2 vTexCoord;
+
+void main()
+{
+	gl_Position = vec4((aVertexPosition + Pos - Scroll) * p1 + p2, 0, 1);
+	vTexCoord = aVertexTexCoord;
+}

glsl/postprocess_textured_vortex.frag

@@ -0,0 +1,22 @@
+#version {VERSION}
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+uniform sampler2D VortexTexture;
+uniform sampler2D WorldTexture;
+
+in vec2 vTexCoord;
+out vec4 fragColor;
+
+void main()
+{
+	vec4 vtx = texture(VortexTexture, vTexCoord.xy);
+
+	vec2 delta = (vtx.bg - 0.5) * 256.0;
+	float frac = 16.0 * vtx.r + 0.0625;
+	if (vtx.r > 0.055)
+		discard;
+
+	fragColor = texelFetch(WorldTexture, ivec2(gl_FragCoord.xy + delta), 0) * vec4(frac, frac, frac, 1);
+}