andras/decla-red
andras/decla-red
Watch
1
0
Fork
You've already forked decla-red
 0
Code Issues Pull requests 8 Projects Releases Packages 1 Wiki Activity Actions

Add lighting shader

Browse source
This commit is contained in:
schmelczerandras 2020-07-22 22:47:26 +02:00
commit 0cd383794c
1 changed files with 144 additions and 295 deletions
Download patch file Download diff file Expand all files Collapse all files

110
frontend/src/shaders/random.frag
View file

@ -2,7 +2,6 @@
precision mediump float;
const float smoothing = 10.0;
const float inf = 1000000.0;
const float pi = atan(1.0) * 4.0;
@ -11,16 +10,6 @@ float interpolate(float from, float to, float quotient) {
return from + (to - from) * clamp(steppedQ, 0.0, 1.0);
}
vec2 rotate90deg(in vec2 vector) {
return vec2(-vector.y, vector.x);
}
struct Line {
vec2 a;
vec2 b;
vec2 normal;
bool isLineEnd;
}[16] lines;
float noise(float x){
return fract(sin(x) * 43758.5453123);
@ -57,101 +46,4 @@ float noise(vec2 st) {
dot( random2(i + vec2(1.0,0.0) ), f - vec2(1.0,0.0) ), u.x),
mix( dot( random2(i + vec2(0.0,1.0) ), f - vec2(0.0,1.0) ),
dot( random2(i + vec2(1.0,1.0) ), f - vec2(1.0,1.0) ), u.x), u.y);
}
float lineDistance(in vec2 position, in Line line, out float h) {
vec2 pa = position - line.a, ba = line.b - line.a;
h = clamp(dot(pa, ba) / dot(ba, ba), 0.0, 1.0);
vec2 delta = pa - ba*h;
// sign can return 0, double sign prevents this
float side = sign(sign(dot(delta, line.normal)) - 0.5);
return length(delta) * side; //+ terrain(length(ba * h));
}
Line endDummyLineFromLine(Line line) {
return Line(line.b, line.b + rotate90deg(line.normal), line.normal, false);
}
float getDistance(in vec2 target) {
float minDistance = inf;
float leftJoinAcuteness = 0.0;
vec2 splitterLineNormalStart = vec2(-1.0, 0.0);
bool skipDistanceToPrevious = true;
for (int i = 0; i < lines.length(); i++) {
Line current = lines[i];
Line next;
if (current.isLineEnd || i + 1 == lines.length()) {
next = endDummyLineFromLine(current);
} else {
next = lines[i + 1];
}
vec2 splitterLineNormalEnd = rotate90deg(normalize(current.normal + next.normal));
float h;
float distanceToCurrent = lineDistance(target, current, h);
float rightJoinAcuteness = dot(next.b - current.a, next.normal - current.normal);
distanceToCurrent -= interpolate(
sign(leftJoinAcuteness) * smoothing,
sign(rightJoinAcuteness) * smoothing, h
);
leftJoinAcuteness = rightJoinAcuteness;
if (
!(
dot(target - current.a, splitterLineNormalStart * -sign(dot(current.b - current.a, splitterLineNormalStart))) > 0.0
|| dot(target - current.b, splitterLineNormalEnd * sign(dot(current.a - current.b, splitterLineNormalEnd))) <= 0.0
) && abs(distanceToCurrent) < abs(minDistance)
) {
minDistance = distanceToCurrent;
}
splitterLineNormalStart = splitterLineNormalEnd;
}
return minDistance;
}
void createWorld() {
lines[0] = Line(vec2(0.0, 300.0), vec2(550.0, 140.0), vec2(1.0), false);
lines[1] = Line(vec2(550.0, 140.0), vec2(750.0, 130.0), vec2(1.0), false);
lines[2] = Line(vec2(750.0, 130.0), vec2(650.0, 230.0), vec2(1.0), false);
lines[3] = Line(vec2(650.0, 230.0), vec2(850.0, 230.0), vec2(1.0), false);
lines[4] = Line(vec2(850.0, 230.0), vec2(800.0, 150.0), vec2(1.0), false);
lines[5] = Line(vec2(800.0, 150.0), vec2(1000.0, 120.0), vec2(1.0), false);
lines[6] = Line(vec2(1000.0, 120.0), vec2(1150, 120.0), vec2(1.0), false);
lines[7] = Line(vec2(1150, 120.0), vec2(10200, 350.0), vec2(1.0), true);
lines[8] = Line(vec2(0.0, 600.0), vec2(550.0, 440.0), vec2(-1.0), false);
lines[9] = Line(vec2(550.0, 440.0), vec2(750.0, 430.0), vec2(-1.0), false);
lines[10] = Line(vec2(750.0, 430.0), vec2(650.0, 530.0), vec2(-1.0), false);
lines[11] = Line(vec2(650.0, 530.0), vec2(850.0, 530.0), vec2(-1.0), false);
lines[12] = Line(vec2(850.0, 530.0), vec2(820.0, 450.0), vec2(-1.0), false);
lines[13] = Line(vec2(820.0, 450.0), vec2(1000.0, 420.0), vec2(-1.0), false);
lines[14] = Line(vec2(1000.0, 420.0), vec2(1150, 420.0), vec2(-1.0), false);
lines[15] = Line(vec2(1150, 420.0), vec2(10200, 650.0), vec2(-1.0), true);
for (int i = 0; i < lines.length(); i++) {
vec2 tangent = lines[i].b - lines[i].a;
lines[i].normal = normalize(
vec2(-lines[i].normal.x * tangent.y, lines[i].normal.x * tangent.x)
);
}
}
uniform vec2 cameraPosition;
uniform vec2 viewBoxSize;
uniform vec2 resolution;
out vec4 fragmentColor;
void main() {
createWorld();
vec2 pixelPosition = gl_FragCoord.xy + vec2(0.5);
vec2 position = pixelPosition / resolution * viewBoxSize + cameraPosition;
fragmentColor = vec4(vec3(1.0) * clamp(0.0, 1.0, getDistance(position)), 1.0);
}
}