File:Grey fog in Ren'Py.png

Summary

An example of a solid-color background and also an example of a shader: the background is grey and the sprite is mixed with grey to make it look like it's in a foggy environment.

Made this myself in Ren'Py using a sprite I drew in a couple of minutes. I didn't want to use a commercial VN but it also seemed selfish to use a published VN made by myself, so I made a VN specifically to take screenshots like this. The license of Ren'Py itself is explained on its website, but it seems the UI itself wouldn't stop me from putting a screenshot under CC-BY-SA-2.5.

Code used in Ren'Py to create the transform used in this image:

init python:
    renpy.register_shader("MixFog.MixFog", variables="""
uniform sampler2D tex0;
uniform float u_amount;
uniform vec3 u_col;
varying vec2 v_tex_coord;
             
     """, fragment_300="""
    gl_FragColor = texture2D(tex0, v_tex_coord);
    gl_FragColor.rgb = mix (gl_FragColor.rgb, u_col, u_amount);
    gl_FragColor.rgb *= gl_FragColor.a; // I think Ren'Py may be using premultiplied alpha
     """)

transform foggy:
    shader "MixFog.MixFog"
    u_amount 0.95
    u_col (0.5, 0.5, 0.5)

And then to apply the transform, I used show glass worried at foggy.

Licensing

Template:CC-by-sa-2.5