maplibre-gl/src/shaders/glsl/hillshade_prepare.fragment.glsl.g.ts

BSD licensed community fork of mapbox-gl, a WebGL interactive maps library

// This file is generated. Edit build/generate-shaders.ts, then run `npm run codegen`.
export default '#ifdef GL_ES\nprecision highp float;\n#endif\nuniform sampler2D u_image;in vec2 v_pos;uniform vec2 u_dimension;uniform float u_zoom;uniform vec4 u_unpack;float getElevation(ivec2 texel) {vec4 data=texelFetch(u_image,texel,0)*255.0;data.a=-1.0;return dot(data,u_unpack);}void main() {ivec2 pos=ivec2(gl_FragCoord.xy)+ivec2(1);float tileSize=u_dimension.x-2.0;float a=getElevation(pos+ivec2(-1,-1));float b=getElevation(pos+ivec2(0,-1));float c=getElevation(pos+ivec2(1,-1));float d=getElevation(pos+ivec2(-1,0));float e=getElevation(pos);float f=getElevation(pos+ivec2(1,0));float g=getElevation(pos+ivec2(-1,1));float h=getElevation(pos+ivec2(0,1));float i=getElevation(pos+ivec2(1,1));float exaggerationFactor=u_zoom < 2.0 ? 0.4 : u_zoom < 4.5 ? 0.35 : 0.3;float exaggeration=u_zoom < 15.0 ? (u_zoom-15.0)*exaggerationFactor : 0.0;vec2 deriv=vec2((c+f+f+i)-(a+d+d+g),(g+h+h+i)-(a+b+b+c))*tileSize/pow(2.0,exaggeration+(28.2562-u_zoom));fragColor=clamp(vec4(deriv.x/8.0+0.5,deriv.y/8.0+0.5,1.0,1.0),0.0,1.0);\n#ifdef OVERDRAW_INSPECTOR\nfragColor=vec4(1.0);\n#endif\n}';