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#version 120
varying vec4 passColour;
varying vec3 passNormal;
uniform sampler2D textureIn;
uniform int millis;
//Algorithm by hughsk
vec3 hsv2rgb(vec3 c) {
vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
}
vec3 rgb2hsv(vec3 c) {
vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));
float d = q.x - min(q.w, q.y);
float e = 1.0e-10;
return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
}
void main() {
vec4 texture = texture2D(textureIn, gl_TexCoord[0].st);
float t = gl_TexCoord[0].t;
t = clamp(t, 10.0f/1024.0f, 410.0f/1024.0f);
float start = 56.0f - 44.0f*t/(420.0f/1024.0f);
float width = 182.0f + 90.0f*t/(420.0f/1024.0f);
float scaleFactor = 1.0f/(width/1024.0f)*112.0f;
float index = mod(millis/20.0f+t*scaleFactor, 2820.0f);
float yIndex = floor(index/1024.0f)*112.0f-(gl_TexCoord[0].s-start/1024.0f)*scaleFactor+532.0f;
float xIndex = mod(index, 1024.0f);
vec3 world = texture2D(textureIn, vec2(xIndex/1024.0f, yIndex/1024.0f)).xyz;
float hue = 0.0f;
float saturation = 1.0f;
float value = 1.0f;
if(index < 208) { //sky
float blurFactor = clamp((index-158)/100.0f, 0.0f, 0.5f);
hue = 200.0f;
saturation = 1.0f - blurFactor;
value = 0.9f - 0.6f*blurFactor;
} else if(index < 800) { //underground
if(index < 400) {
float blurFactor = clamp((258-index)/100.0f, 0.0f, 0.5f);
hue = 200.0f;
saturation = 0.0f + blurFactor;
value = 0.3f + 0.6f*blurFactor;
} else {
float blurFactor = clamp((index-750)/100.0f, 0.0f, 0.5f);
hue = 350.0f;
saturation = 0.0f + 0.5f*blurFactor;
value = 0.3f - 0.1f*blurFactor;
}
} else if(index < 1762) { //nether
if(index < 1200) {
float blurFactor = clamp((850-index)/100.0f, 0.0f, 0.5f);
hue = 350.0f;
saturation = 0.5f - 0.5f*blurFactor;
value = 0.2f + 0.1f*blurFactor;
} else {
float blurFactor = clamp((index-1712)/100.0f, 0.0f, 0.5f);
hue = 350.0f;
saturation = 0.5f - 0.5f*blurFactor;
value = 0.2f + 0.1f*blurFactor;
}
} else if(index < 2200) { //underground
if(index < 1900) {
float blurFactor = clamp((1812-index)/100.0f, 0.0f, 0.5f);
hue = 350.0f;
saturation = 0.0f + 0.5f*blurFactor;
value = 0.3f - 0.1f*blurFactor;
} else {
float blurFactor = clamp((index-2150)/100.0f, 0.0f, 0.5f);
hue = 0.0f;
saturation = 0.0f;
value = 0.3f - 0.3f*blurFactor;
}
} else if(index < 2600) { //end
if(index < 2400) {
float blurFactor = clamp((2250-index)/100.0f, 0.0f, 0.5f);
hue = 0.0f;
saturation = 0.0f;
value = 0.0f + 0.3f*blurFactor;
} else {
float blurFactor = clamp((index-2550)/100.0f, 0.0f, 0.5f);
hue = 200.0f;
saturation = 0.0f + blurFactor;
value = 0.0f + 0.9f*blurFactor;
}
} else { //sky
float blurFactor = clamp((2650-index)/100.0f, 0.0f, 0.5f);
hue = 200.0f;
saturation = 1.0f - blurFactor;
value = 0.9f - 0.9f*blurFactor;
}
hue = mod(hue, 360.0f);
saturation = max(0.0f, min(1.0f, saturation));
value = max(0.0f, min(1.0f, value));
vec3 hsv = rgb2hsv(texture.rgb);
hsv.x = hue/360.0f;
hsv.y *= saturation;
hsv.z *= value;
gl_FragColor = vec4(hsv2rgb(hsv)*texture.a + world*(1.0f-texture.a), 1.0f) * passColour;
vec3 fakeSunNormal = normalize(vec3(0.2f,1.0f,-0.2f));
vec3 normNormal = normalize(passNormal);
float shading = max(0.6f, dot(fakeSunNormal, normNormal));
gl_FragColor = vec4(gl_FragColor.rgb*shading, gl_FragColor.a);
}
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