├── README.md
└── rgb_split_shader.rpy


/README.md:
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 1 | # RGB-Split
 2 | ![screenshot0001](https://user-images.githubusercontent.com/23055740/128658333-8ad6c0a4-50ed-49fe-a05c-af4c43ccce4a.png)
 3 | 
 4 | Custom Ren'Py RGB Split shader that has the same effect as chromatic aberration or anaglyph images.
 5 | It shifts the red and blue channels each one in different directions and rotates them around the green channel.
 6 | 
 7 | Video: https://vk.com/video-201215195_456239021
 8 | 
 9 | # Instruction:
10 | Minimum Ren'Py version - 7.4.0
11 | 
12 | * Drop rgb_split_shader.rpy inside your project.
13 | * Add "config.gl2 = True" line to enable shaders in your game.
14 | * Create transform with "rgb_split" shader and set values to u_intensity and u_angle.
15 | * Apply created transform to your image.
16 | 
17 | # Usage Example:
18 | 
19 | ![2021-08-09_085415](https://user-images.githubusercontent.com/23055740/128658974-97f348dd-5560-4b49-89eb-70e6a7d6a519.png)
20 | 
21 | u_intensity - distance between channels, in pixels
22 | 
23 | u_angle - rotation degrees. 
24 | 


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/rgb_split_shader.rpy:
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 1 | python early hide:
 2 | 
 3 |     ############################################################################
 4 |     ## RGB Split
 5 | 
 6 |     """
 7 |     'rgb_split'     - shader name.
 8 |     'u_intensity'   - channels separation length.
 9 |     'u_angle'       - angle degrees.
10 |     """
11 | 
12 |     renpy.register_shader(
13 |         "rgb_split",
14 |         variables="""
15 |             uniform float u_intensity;
16 |             uniform float u_angle;
17 |             uniform vec2 u_model_size;
18 |             uniform sampler2D tex0;
19 |             attribute vec2 a_tex_coord;
20 |             varying vec2 v_tex_coord;
21 |             varying vec2 v_pix_size;
22 |         """,
23 |         vertex_300="""
24 |             v_tex_coord = a_tex_coord;
25 |             v_pix_size = 1.0 / u_model_size;
26 |         """,
27 |         fragment_300="""
28 |             #define PI 3.14159265359
29 | 
30 |             float rad = u_intensity / 2.0;
31 |             float fi = u_angle * PI / 180.0;
32 | 
33 |             vec2 angle = vec2(cos(fi), sin(fi));
34 | 
35 |             vec2 pos_r = v_tex_coord + rad * v_pix_size * angle;
36 |             vec2 pos_g = v_tex_coord;
37 |             vec2 pos_b = v_tex_coord - rad * v_pix_size * angle;
38 | 
39 |             vec4 res;
40 |             res.r = texture2D(tex0, pos_r).r;
41 |             res.g = texture2D(tex0, pos_g).g;
42 |             res.b = texture2D(tex0, pos_b).b;
43 |             res.a = (texture2D(tex0, pos_r).a + texture2D(tex0, pos_g).a + texture2D(tex0, pos_b).a) / 3.0;
44 | 
45 |             gl_FragColor = res;
46 |         """
47 |     )
48 | 
49 | init -1000:
50 | 
51 |     transform tr_rgb_split(time=30.0, intensity=5.0):
52 |         animation
53 |         shader 'rgb_split'
54 |         u_intensity intensity
55 |         block:
56 |             linear time u_angle 360.0
57 |             u_angle 0.0
58 |             repeat
59 | 


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