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Implement ambient occlusion shader based on camera angle

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This commit is contained in:
Mark B 2022-11-04 01:47:12 +01:00
parent 831d9185a2
commit 52b30b44ea
1 changed files with 23 additions and 1 deletions
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24
src/map/lowres/LowresFragmentShader.js
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@ -27,6 +27,10 @@ import { ShaderChunk } from 'three';
export const LOWRES_FRAGMENT_SHADER = `
${ShaderChunk.logdepthbuf_pars_fragment}
#define PI 3.1415926535897932
#define PI_HALF 1.5707963267948966
#define PI_D10 0.3141592653589793
#ifndef texture
#define texture texture2D
#endif
@ -83,7 +87,25 @@ void main() {
float heightX = metaToHeight(texture(textureImage, posToMetaUV(vPosition.xz + vec2(1.0, 0.0))));
float heightZ = metaToHeight(texture(textureImage, posToMetaUV(vPosition.xz + vec2(0.0, 1.0))));
float diff = (height - heightX) + (height - heightZ);
color.rgb += clamp(diff * 0.04, -0.2, 0.04);
vec3 defaultRGB = color.rgb + clamp(diff * 0.04, -0.2, 0.04);
vec3 occRGB = color.rgb + clamp(diff * 0.02, -0.1, 0.04);
float ao = 0.0;
const float r = 3.0;
const float step = 0.2;
for (float vx = -r; vx <= r; vx++) {
for (float vz = -r; vz <= r; vz++) {
diff = height - metaToHeight(texture(textureImage, posToMetaUV(vPosition.xz + vec2(vx * step, vz * step))));
if (diff < 0.0) {
ao -= step / r;
}
}
}
occRGB += ao * 0.1;
vec3 rgb = mix(defaultRGB, occRGB, smoothstep(PI_HALF + PI_D10, PI - PI_D10, acos(clamp(viewMatrix[1][1] - 1.0, -1.0, 0.0))));
color.rgb = rgb;
float blockLight = metaToLight(meta);
float light = mix(blockLight, 15.0, sunlightStrength);