@three.ez/instanced-mesh/src/shaders/chunks/instanced_pars_vertex.glsl.js

Enhanced InstancedMesh with frustum culling, fast raycasting (using BVH), sorting, visibility management and more.

export default /* glsl */ `
#ifdef USE_INSTANCING_INDIRECT
  attribute uint instanceIndex;
  uniform highp sampler2D matricesTexture;  

  mat4 getInstancedMatrix() {
    int size = textureSize( matricesTexture, 0 ).x;
    int j = int( instanceIndex ) * 4;
    int x = j % size;
    int y = j / size;
    vec4 v1 = texelFetch( matricesTexture, ivec2( x, y ), 0 );
    vec4 v2 = texelFetch( matricesTexture, ivec2( x + 1, y ), 0 );
    vec4 v3 = texelFetch( matricesTexture, ivec2( x + 2, y ), 0 );
    vec4 v4 = texelFetch( matricesTexture, ivec2( x + 3, y ), 0 );
    return mat4( v1, v2, v3, v4 );
  }
#endif
`;
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