- "vec4 glyph = texture( uTexMain, aTexCoords );"
- "FragColor = vec4( uColour + glyph.rgb * 0.2, glyph.a );"
+ "vec2 center_coords = aTexCoords.xy - 0.5;"
+ "vec2 center_coords_sqr = center_coords*center_coords;"
+ "float circle_factor = smoothstep( 0.07, 0.0625, center_coords_sqr.x+center_coords_sqr.y );"
+
+ "float bulge_amt = center_coords_sqr.x+center_coords_sqr.y;"
+ "vec2 warped_coords = aTexCoords.zw+uTexOffset - center_coords;"
+ "vec4 noise_sample = texture( uTexMain, warped_coords );"
+
+ "float rim_light = (center_coords_sqr.x+center_coords_sqr.y)*15.0;"
+
+ "vec2 shadow_coords = center_coords + vec2(0.02,0.07);"
+ "vec2 shadow_coords_sqr = shadow_coords*shadow_coords;"
+ "float shadow = exp(-((shadow_coords_sqr.x+shadow_coords_sqr.y)-0.0125)*15.0);"
+
+ "vec3 marble_comp = uColour*0.9 + (noise_sample.x*0.7+pow(rim_light,3.0)*2.0) * 0.1;"
+ "vec4 colour_comp = mix( vec4(0.74,0.53,0.34,shadow), vec4(marble_comp,1.0), circle_factor );"
+
+ "FragColor = colour_comp;"