@three.ez/batched-mesh-extensions/src/patch/PatchBatchedMeshMaterial.js

Utility extension methods for BatchedMesh

export function patchBatchedMeshMaterial(batchedMesh) {
    const material = batchedMesh.material;
    const onBeforeCompileBase = material.onBeforeCompile.bind(material);
    // TODO edit also the material compile cache key?
    material.onBeforeCompile = (shader, renderer) => {
        if (batchedMesh.uniformsTexture) {
            shader.uniforms.uniformsTexture = { value: batchedMesh.uniformsTexture };
            const { vertex, fragment } = batchedMesh.uniformsTexture.getUniformsGLSL('uniformsTexture', 'batchIndex', 'float');
            shader.vertexShader = shader.vertexShader.replace('void main() {', vertex);
            shader.fragmentShader = shader.fragmentShader.replace('void main() {', fragment);
            shader.vertexShader = shader.vertexShader.replace('void main() {', 'void main() { float batchIndex = getIndirectIndex( gl_DrawID );');
        }
        onBeforeCompileBase(shader, renderer);
    };
}
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