shader_type canvas_item;

void fragment() {
    // Get texture color
    vec4 tex_color = texture(TEXTURE, UV);
    
    // Tint red
    COLOR = tex_color * vec4(1.0, 0.5, 0.5, 1.0);
}

shader_type canvas_item;

uniform float dissolve_amount : hint_range(0.0, 1.0) = 0.0;
uniform sampler2D noise_texture;

void fragment() {
    vec4 tex_color = texture(TEXTURE, UV);
    float noise = texture(noise_texture, UV).r;
    
    if (noise < dissolve_amount) {
        discard;  // Make pixel transparent
    }
    
    COLOR = tex_color;
}

shader_type canvas_item;

uniform float wave_speed = 2.0;
uniform float wave_amount = 0.05;

void fragment() {
    vec2 uv = UV;
    uv.x += sin(uv.y * 10.0 + TIME * wave_speed) * wave_amount;
    
    COLOR = texture(TEXTURE, uv);
}

shader_type canvas_item;

uniform vec4 outline_color : source_color = vec4(0.0, 0.0, 0.0, 1.0);
uniform float outline_width = 2.0;

void fragment() {
    vec4 col = texture(TEXTURE, UV);
    vec2 pixel_size = TEXTURE_PIXEL_SIZE * outline_width;
    
    float alpha = col.a;
    alpha = max(alpha, texture(TEXTURE, UV + vec2(pixel_size.x, 0.0)).a);
    alpha = max(alpha, texture(TEXTURE, UV + vec2(-pixel_size.x, 0.0)).a);
    alpha = max(alpha, texture(TEXTURE, UV + vec2(0.0, pixel_size.y)).a);
    alpha = max(alpha, texture(TEXTURE, UV + vec2(0.0, -pixel_size.y)).a);
    
    COLOR = mix(outline_color, col, col.a);
    COLOR.a = alpha;
}

shader_type spatial;

void fragment() {
    ALBEDO = vec3(1.0, 0.0, 0.0);  // Red material
}

shader_type spatial;

uniform vec3 base_color : source_color = vec3(1.0);
uniform int color_steps = 3;

void light() {
    float NdotL = dot(NORMAL, LIGHT);
    float stepped = floor(NdotL * float(color_steps)) / float(color_steps);
    
    DIFFUSE_LIGHT = base_color * stepped;
}

shader_type canvas_item;

uniform float vignette_strength = 0.5;

void fragment() {
    vec4 color = texture(TEXTURE, UV);
    
    // Distance from center
    vec2 center = vec2(0.5, 0.5);
    float dist = distance(UV, center);
    
    float vignette = 1.0 - dist * vignette_strength;
    
    COLOR = color * vignette;
}

// Float slider
uniform float intensity : hint_range(0.0, 1.0) = 0.5;

// Color picker
uniform vec4 tint_color : source_color = vec4(1.0);

// Texture
uniform sampler2D noise_texture;

// Access in code:
material.set_shader_parameter("intensity", 0.8)

// ✅ Good - adjustable
uniform float speed = 1.0;

void fragment() {
    COLOR.r = sin(TIME * speed);
}

// ❌ Bad - hardcoded
void fragment() {
    COLOR.r = sin(TIME * 2.5);
}

// Avoid expensive operations in fragment shader
// Pre-calculate values when possible
// Use textures for complex patterns

// Water wave effect
// Creates horizontal distortion based on sine wave
uniform float wave_amplitude = 0.02;