Eaglercraft does not support traditional GLSL shader packs (like SEUS, BSL, or Complementary Shaders) that you use in standard Java Edition Minecraft.
if (edge > 0.2) gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0); // Black outline else gl_FragColor = center; shaders for eaglercraft
// Sample neighboring pixels vec4 center = texture2D(u_texture, v_texCoord); vec4 left = texture2D(u_texture, v_texCoord - vec2(texelSize.x, 0.0)); vec4 right = texture2D(u_texture, v_texCoord + vec2(texelSize.x, 0.0)); vec4 up = texture2D(u_texture, v_texCoord - vec2(0.0, texelSize.y)); vec4 down = texture2D(u_texture, v_texCoord + vec2(0.0, texelSize.y)); Eaglercraft does not support traditional GLSL shader packs
// Fragment Shader - Toon Outline Effect precision mediump float; uniform sampler2D u_texture; varying vec2 v_texCoord; What Eaglercraft Can Do (WebGL Shaders) Eaglercraft uses
// Detect edges using luminance difference float edge = 0.0; edge += abs(center.r - left.r); edge += abs(center.r - right.r); edge += abs(center.g - up.g); edge += abs(center.b - down.b);
void main() vec2 texelSize = 1.0 / vec2(800.0, 600.0); // Adjust to your resolution
Eaglercraft runs on , not Java and OpenGL. Traditional shader mods (OptiFine, Iris) cannot be ported directly. What Eaglercraft Can Do (WebGL Shaders) Eaglercraft uses WebGL shaders internally for its rendering pipeline. These are written in GLSL ES (OpenGL ES Shading Language) , not the full GLSL used by Java Minecraft.