<!//  LightClusterGrid.slh////  Created by Sam Gateau on 9/8/16.//  Copyright 2013 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html!><@if not RENDER_LIGHT_CLUSTER_GRID_SLH@><@def RENDER_LIGHT_CLUSTER_GRID_SLH@> <@include render-utils/ShaderConstants.h@> struct FrustumGrid {    float frustumNear;    float rangeNear;    float rangeFar;    float frustumFar;    ivec3 dims;    float spare;    mat4 eyeToGridProj;    mat4 worldToEyeMat;    mat4 eyeToWorldMat;}; UNIFORM_BUFFER(RENDER_UTILS_BUFFER_LIGHT_CLUSTER_FRUSTUM_GRID, frustumGridBuffer) {    FrustumGrid frustumGrid;}; float projection_getNear(mat4 projection) {    float planeC = projection[2][3] + projection[2][2];    float planeD = projection[3][2];    return planeD / planeC;}float projection_getFar(mat4 projection) {    //float planeA = projection[0][3] - projection[0][2]; All Zeros    //float planeB = projection[1][3] - projection[1][2]; All Zeros    float planeC = projection[2][3] - projection[2][2];    float planeD = /*projection[3][3]*/ -projection[3][2];    return planeD / planeC;} // glsl / C++ compatible source as interface for FrustrumGrid<@include LightClusterGrid_shared.slh@> // end of hybrid include <@if GLPROFILE == MAC_GL @>#define GRID_NUM_ELEMENTS 4096#define GRID_INDEX_TYPE ivec4#define GRID_FETCH_BUFFER(i) i / 4][i % 4<@else@>#define GRID_NUM_ELEMENTS 4096#define GRID_INDEX_TYPE ivec4#define GRID_FETCH_BUFFER(i) i / 4][i % 4 <!#define GRID_NUM_ELEMENTS 16384#define GRID_INDEX_TYPE int#define GRID_FETCH_BUFFER(i) i!><@endif@> UNIFORM_BUFFER(RENDER_UTILS_BUFFER_LIGHT_CLUSTER_GRID, clusterGridBuffer) {    GRID_INDEX_TYPE _clusterGridTable[GRID_NUM_ELEMENTS];}; UNIFORM_BUFFER(RENDER_UTILS_BUFFER_LIGHT_CLUSTER_CONTENT, clusterContentBuffer) {    GRID_INDEX_TYPE _clusterGridContent[GRID_NUM_ELEMENTS];}; ivec3 clusterGrid_getCluster(int index) {    int clusterDesc = _clusterGridTable[GRID_FETCH_BUFFER(index)];    int numPointLights = 0xFF & (clusterDesc >> 16);    int numSpotLights = 0xFF & (clusterDesc >> 24);    int contentOffset = 0xFFFF & (clusterDesc);    return ivec3(numPointLights, numSpotLights, contentOffset);} int clusterGrid_getClusterLightId(int index, int offset) {    int elementIndex = offset + index;    /*    int element = _clusterGridContent[GRID_FETCH_BUFFER(elementIndex)];    return element;    */    int element = _clusterGridContent[GRID_FETCH_BUFFER((elementIndex >> 1))];    return (element >> (16 * int((elementIndex & 0x00000001) == 1))) & 0x0000FFFF;}  <@func fetchClusterInfo(fragWorldPos)@>     // From frag world pos find the cluster    vec4 clusterEyePos = frustumGrid_worldToEye(<$fragWorldPos$>);    ivec3 clusterPos = frustumGrid_eyeToClusterPos(clusterEyePos.xyz);     ivec3 cluster = clusterGrid_getCluster(frustumGrid_clusterToIndex(clusterPos));    int numLights = cluster.x + cluster.y;    ivec3 dims = frustumGrid.dims.xyz; <@endfunc@> bool hasLocalLights(int numLights, ivec3 clusterPos, ivec3 dims) {    return numLights>0         && all(greaterThanEqual(clusterPos, ivec3(0)))         && all(lessThan(clusterPos.xy, dims.xy))        && clusterPos.z <= dims.z;} <@endif@>