Recolor and Print
This shader can replace colors and add textures to colors in sprites. This version is capable of replacing 9 predefined colors, a quantity that can be expanded in several different ways.
After loading the shader fill the field “h_frames” with the total amount of horizontal frames of the spritesheet and the field “v_frames” with the total amount of vertical frames of the spritesheet where the shader is being applied. Don’t forget to add the pattern you want to appear on the sprite in the “chosenPrint” field, otherwise the sprite will remain unprinted.
You can check out a demo here if you’re interested.
I’m not an expert in shaders, so feel free to give suggestions for improvement if you want.
Shader code
shader_type canvas_item;
render_mode blend_mix, unshaded;
// EXACT QUANTITY OF HORIZONTAL FRAMES OF THE FULL IMAGE
uniform float h_frames = 1.0;
// EXACT QUANTITY OF VERTICAL FRAMES OF THE FULL IMAGE
uniform float v_frames = 2.0;
uniform sampler2D chosenPrint;
uniform bool hasPrint = false;
uniform vec4 replaceGreen : hint_color;
uniform vec4 replaceRed : hint_color;
uniform vec4 replaceBlue : hint_color;
uniform vec4 replaceYellow : hint_color;
uniform vec4 replaceMagenta : hint_color;
uniform vec4 replaceCyan : hint_color;
uniform vec4 replaceWhite : hint_color;
uniform vec4 replaceGrey : hint_color;
uniform vec4 replaceBlack : hint_color;
vec4 replace(vec4 targetColor, vec4 replacementColor, vec4 pattern) {
if (hasPrint == true) {
return replacementColor * targetColor * vec4(pattern.r, pattern.g, pattern.b, 1.0);
} else {
return replacementColor * targetColor;
}
}
void fragment() {
vec4 transfer = texture(chosenPrint, mod(vec2(UV.x * h_frames, UV.y * v_frames), vec2(1.0, 1.0)));
vec4 texColor = texture(TEXTURE, UV);
COLOR = texColor;
if(texColor.a > 0.0) {
// RED
if(texColor.r - (texColor.g * 100.0 + texColor.b * 100.0) > 0.0)
COLOR = replace(vec4(texColor.r, texColor.r, texColor.r, 1.0), replaceRed, transfer);
// GREEN
else if(texColor.g - (texColor.r * 100.0 + texColor.b * 100.0) > 0.0)
COLOR = replace(vec4(texColor.g, texColor.g, texColor.g, 1.0), replaceGreen, transfer);
// BLUE
else if(texColor.b - (texColor.r * 100.0 + texColor.g * 100.0) > 0.0)
COLOR = replace(vec4(texColor.b, texColor.b, texColor.b, 1.0), replaceBlue, transfer);
// MAGENTA
else if((texColor.r + texColor.b) - (texColor.g * 100.0) > 0.0)
COLOR = replace(vec4(texColor.r, texColor.b, texColor.b, 1.0), replaceMagenta, transfer);
// YELLOW
else if((texColor.r + texColor.g) - (texColor.b * 100.0) > 0.0)
COLOR = replace(vec4(texColor.r, texColor.g, texColor.g, 1.0), replaceYellow, transfer);
// CYAN
else if((texColor.b + texColor.g) - (texColor.r * 100.0) > 0.0)
COLOR = replace(vec4(texColor.b, texColor.g, texColor.b, 1.0), replaceCyan, transfer);
// WHITE
else if(texColor == vec4(1.0, 1.0, 1.0, 1.0))
COLOR = replace(vec4(1.0, 1.0, 1.0, 1.0), replaceWhite, transfer);
// GREY
else if(distance(COLOR, vec4(0.5, 0.5, 0.5, 1.0)) < 0.005)
COLOR = replace(vec4(1.0, 1.0, 1.0, 1.0), replaceGrey, transfer);
// BLACK
else if(distance(COLOR, vec4(0.0, 0.0, 0.0, 1.0)) < 0.005)
COLOR = replace(vec4(1.0, 1.0, 1.0, 1.0), replaceBlack, transfer);
}
}
