31 lines
1.4 KiB
Plaintext
31 lines
1.4 KiB
Plaintext
shader_type canvas_item;
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// The color of the healthy terrain you want to target.
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uniform vec4 terrain_color : source_color = vec4(0.0, 1.0, 0.0, 1.0);
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// The color the terrain will turn into as it gets corrupted.
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uniform vec4 corrupted_color : source_color = vec4(0.3, 0.1, 0.2, 1.0);
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// This value will be controlled by your C# script (from 0.0 to 1.0).
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uniform float corruption_level : hint_range(0.0, 1.0);
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// A small tolerance to catch pixels that aren't *exactly* the terrain color.
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uniform float tolerance : hint_range(0.0, 0.5) = 0.1;
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void fragment() {
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// Get the original color of the pixel from the sprite's texture.
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vec4 original_color = texture(TEXTURE, UV);
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// Calculate the difference between this pixel's color and the healthy terrain color.
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// The distance() function is great for comparing colors.
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float color_difference = distance(original_color.rgb, terrain_color.rgb);
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// Check if the difference is within our tolerance.
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if (color_difference < tolerance) {
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// If it's a terrain pixel, mix the original terrain color with the
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// corrupted color based on the corruption_level.
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vec3 final_color = mix(terrain_color.rgb, corrupted_color.rgb, corruption_level);
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COLOR = vec4(final_color, original_color.a);
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} else {
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// If it's not a terrain pixel (i.e., it's ocean), leave it unchanged.
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COLOR = original_color;
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}
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}
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