////  Cube.cpp//  interface////  Created by Philip on 12/31/12.//  Copyright (c) 2012 High Fidelity, Inc. All rights reserved.// #include "VoxelSystem.h"#include <AgentList.h> const int MAX_VOXELS_PER_SYSTEM = 500000; const int VERTICES_PER_VOXEL = 8;const int VERTEX_POINTS_PER_VOXEL = 3 * VERTICES_PER_VOXEL;const int COLOR_VALUES_PER_VOXEL = 3 * VERTICES_PER_VOXEL;const int INDICES_PER_VOXEL = 3 * 12; const float CUBE_WIDTH = 0.025f; float identityVertices[] = { -1, -1, 1,                            1, -1, 1,                            1, -1, -1,                            -1, -1, -1,                            1, 1, 1,                            -1, 1, 1,                            -1, 1, -1,                            1, 1, -1 }; GLubyte identityIndices[] = { 0,1,2, 0,2,3,                              0,4,1, 0,4,5,                              0,3,6, 0,5,6,                              1,2,4, 2,4,7,                              2,3,6, 2,6,7,                              4,5,6, 4,6,7 }; VoxelSystem::VoxelSystem() {    voxelsRendered = 0;} VoxelSystem::~VoxelSystem() {        delete[] verticesArray;    delete[] colorsArray;} void VoxelSystem::parseData(void *data, int size) {    // ignore the first char, it's a V to tell us that this is voxel data    char *voxelDataPtr = (char *) data + 1;     float *position = new float[3];    char *color = new char[3];     // get pointers to position of last append of data    GLfloat *parseVerticesPtr = lastAddPointer;    GLubyte *parseColorsPtr = colorsArray + (lastAddPointer - verticesArray);        int voxelsInData = 0;            // pull voxels out of the received data and put them into our internal memory structure    while ((voxelDataPtr - (char *) data) < size) {                memcpy(position, voxelDataPtr, 3 * sizeof(float));        voxelDataPtr += 3 * sizeof(float);        memcpy(color, voxelDataPtr, 3);        voxelDataPtr += 3;                for (int v = 0; v < VERTEX_POINTS_PER_VOXEL; v++) {            parseVerticesPtr[v] = position[v % 3] + (identityVertices[v] * CUBE_WIDTH);        }                parseVerticesPtr += VERTEX_POINTS_PER_VOXEL;                for (int c = 0; c < COLOR_VALUES_PER_VOXEL; c++) {            parseColorsPtr[c] = color[c % 3];        }                parseColorsPtr += COLOR_VALUES_PER_VOXEL;                voxelsInData++;    }        // increase the lastAddPointer to the new spot, increase the number of rendered voxels    lastAddPointer = parseVerticesPtr;    voxelsRendered += voxelsInData;} VoxelSystem* VoxelSystem::clone() const {    // this still needs to be implemented, will need to be used if VoxelSystem is attached to agent    return NULL;} void VoxelSystem::init() {    // prep the data structures for incoming voxel data    lastDrawPointer = lastAddPointer = verticesArray = new GLfloat[VERTEX_POINTS_PER_VOXEL * MAX_VOXELS_PER_SYSTEM];    colorsArray = new GLubyte[COLOR_VALUES_PER_VOXEL * MAX_VOXELS_PER_SYSTEM];        GLuint *indicesArray = new GLuint[INDICES_PER_VOXEL * MAX_VOXELS_PER_SYSTEM];        // populate the indicesArray    // this will not change given new voxels, so we can set it all up now    for (int n = 0; n < MAX_VOXELS_PER_SYSTEM; n++) {        // fill the indices array        int voxelIndexOffset = n * INDICES_PER_VOXEL;        GLuint *currentIndicesPos = indicesArray + voxelIndexOffset;        int startIndex = (n * VERTICES_PER_VOXEL);                for (int i = 0; i < INDICES_PER_VOXEL; i++) {            // add indices for this side of the cube            currentIndicesPos[i] = startIndex + identityIndices[i];        }    }        // VBO for the verticesArray    glGenBuffers(1, &vboVerticesID);    glBindBuffer(GL_ARRAY_BUFFER, vboVerticesID);    glBufferData(GL_ARRAY_BUFFER, VERTEX_POINTS_PER_VOXEL * sizeof(GLfloat) * MAX_VOXELS_PER_SYSTEM, NULL, GL_DYNAMIC_DRAW);        // VBO for colorsArray    glGenBuffers(1, &vboColorsID);    glBindBuffer(GL_ARRAY_BUFFER, vboColorsID);    glBufferData(GL_ARRAY_BUFFER, COLOR_VALUES_PER_VOXEL * sizeof(GLubyte) * MAX_VOXELS_PER_SYSTEM, NULL, GL_DYNAMIC_DRAW);        // VBO for the indicesArray    glGenBuffers(1, &vboIndicesID);    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vboIndicesID);    glBufferData(GL_ELEMENT_ARRAY_BUFFER, INDICES_PER_VOXEL * sizeof(GLuint) * MAX_VOXELS_PER_SYSTEM, indicesArray, GL_STATIC_DRAW);        // delete the indices array that is no longer needed    delete[] indicesArray;} void VoxelSystem::render() {    // check if there are new voxels to draw    int vertexValuesToDraw = lastAddPointer - lastDrawPointer;        if (vertexValuesToDraw > 0) {        // calculate the offset into each VBO, in vertex point values        int vertexBufferOffset = lastDrawPointer - verticesArray;                // bind the vertices VBO, copy in new data        glBindBuffer(GL_ARRAY_BUFFER, vboVerticesID);        glBufferSubData(GL_ARRAY_BUFFER, vertexBufferOffset * sizeof(float), vertexValuesToDraw * sizeof(float), lastDrawPointer);                // bind the colors VBO, copy in new data        glBindBuffer(GL_ARRAY_BUFFER, vboColorsID);        glBufferSubData(GL_ARRAY_BUFFER, vertexBufferOffset * sizeof(GLubyte), vertexValuesToDraw * sizeof(GLubyte), (colorsArray + (lastDrawPointer - verticesArray)));                // increment the lastDrawPointer to the lastAddPointer value used for this draw        lastDrawPointer += vertexValuesToDraw;    }     // tell OpenGL where to find vertex and color information    glEnableClientState(GL_VERTEX_ARRAY);    glEnableClientState(GL_COLOR_ARRAY);        glBindBuffer(GL_ARRAY_BUFFER, vboVerticesID);    glVertexPointer(3, GL_FLOAT, 0, 0);        glBindBuffer(GL_ARRAY_BUFFER, vboColorsID);    glColorPointer(3, GL_UNSIGNED_BYTE, 0, 0);        // draw the number of voxels we have    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vboIndicesID);    glDrawElements(GL_TRIANGLES, 36 * voxelsRendered, GL_UNSIGNED_INT, 0);        // deactivate vertex and color arrays after drawing    glDisableClientState(GL_VERTEX_ARRAY);    glDisableClientState(GL_COLOR_ARRAY);        // bind with 0 to switch back to normal operation    glBindBuffer(GL_ARRAY_BUFFER, 0);    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);} void VoxelSystem::simulate(float deltaTime) {    }