Godot Version
4.3
Question
Hi, I am working on pixel art game. I applied the Smooth 3D pixel filtering to the sprite and it works fine. However, it create some wired line between different color after I add the color shift code to the shader.
And here is my code:
shader_type canvas_item;
render_mode unshaded;
varying flat vec4 modulate;
const vec4 self_modulate = vec4(2.0, 1.5, 1.0, 1.0);
uniform vec4[5] target_color_array : source_color;
uniform vec4[5] replace_color_array : source_color;
void vertex() {
modulate = COLOR;
}
// Texture must have 'Filter'-flag enabled!
// Automatic smoothing
// independent of geometry and perspective
vec4 texturePointSmooth(sampler2D smp, vec2 uv, vec2 pixel_size)
{
vec2 ddx = dFdx(uv);
vec2 ddy = dFdy(uv);
vec2 lxy = sqrt(ddx * ddx + ddy * ddy);
vec2 uv_pixels = uv / pixel_size;
vec2 uv_pixels_floor = round(uv_pixels) - vec2(0.5f);
vec2 uv_dxy_pixels = uv_pixels - uv_pixels_floor;
uv_dxy_pixels = clamp((uv_dxy_pixels - vec2(0.5f)) * pixel_size / lxy + vec2(0.5f), 0.0f, 1.0f);
uv = uv_pixels_floor * pixel_size;
return textureGrad(smp, uv + uv_dxy_pixels * pixel_size, ddx, ddy);
}
vec4 colorReplacer(vec4 pixelColor)
{
for (int i=0;i<5;i++)
{
int j = i;
if(pixelColor == target_color_array[j])
{
pixelColor = replace_color_array[j];
}
}
return pixelColor;
}
void fragment()
{
vec4 color = texturePointSmooth(TEXTURE, UV, TEXTURE_PIXEL_SIZE);
color = colorReplacer(color);
if ((color.r + color.g + color.b) > 1.6){
COLOR = self_modulate * color;
COLOR.a *= modulate.a;
}
else{
COLOR = color;
}
}
