\n\n\n\n
2. Under modeler <\/em>add new header file ModelBuilder.h<\/strong><\/p>\n\n\n\n Location – C:\\CPP\\engine\\modeler<\/em><\/p>\n\n\n\n Code:<\/p>\n\n\n <\/p>\n\n\n\n In this sample we will create a red box with 1 blue side (the right one). For this we will need to create 1 GameSubject<\/em>, 2 materials<\/em>, a “box” virtual shape<\/em>, then add 6 “faces” to it. Then we’ll need to convert created vertices and triangles arrays into DrawJobs<\/em>. The set of commands\/functions above is defined by these needs.<\/p>\n\n\n\n Now – implementations:<\/p>\n\n\n\n 3. Under modeler <\/em>add new C++ file ModelBuilder.cpp<\/strong><\/p>\n\n\n\n Location – C:\\CPP\\engine\\modeler<\/em><\/p>\n\n\n\n Code:<\/p>\n\n\n <\/p>\n\n\n\n Now we have everything we need to create our first 3D model. In this sample it will be a red box with 1 blue side.<\/p>\n\n\n\n In TheGame.cpp<\/em> we won’t need hard-coded vertex arrays any longer. Instead, we will create them programmatically<\/em>.<\/p>\n\n\n\n 4. Open TheGame.cpp<\/em> and replace the code by following:<\/p>\n\n\n <\/p>\n\n\n\n Let’s take a closer look. Everything happens in the TheGame::getReady()<\/em> (from line 20).<\/p>\n\n\n\n First, we are creating a GameSubj <\/em>and setting initial position and rotation speeds (lines 19 to 26).<\/p>\n\n\n\n In line 28 we’re creating ModelBuilder’s<\/em> instance, which we will use for building vertex arrays and DrawJobs<\/em>.<\/p>\n\n\n\n The next line (29), pMB->useSubjN<\/em>, instructs ModelBuilder <\/em>which GameSubj <\/em>model number is it for (which makes possible to build a few sub-models simultaneously in the future).<\/p>\n\n\n\n Lines 32 to 36 are setting a VirtualShape<\/em>, so all following commands know what we are building,<\/p>\n\n\n\n Lines 40 to 43 are defining the Material<\/em>. <\/p>\n\n\n\n pMB->useMaterial(&mt)<\/em> command (line 43) tells ModelBuilder <\/em>which material number we will use for all newly created vertices and triangles. Open Vertex01.h<\/em> or Triangle01.h<\/em>, you will see subjN <\/em>and materialN <\/em>references.<\/p>\n\n\n\n In line 45 we’re starting to fill vertices and triangles arrays, the command buildBoxFace()<\/em>. Let’s take a closer look.<\/p>\n\n\n\n Open ModelBuilder.cpp<\/em>, line 67. The idea is to create a simple 2D rectangle which faces us, and then rotate and shift it to it’s final place. We are getting this rectangle sizes (width and height) from given VirtualShape <\/em>(parameter pVS<\/em>) and saving them into local VirtualShape vs<\/em>. It’s lines 72 to 115. Also in this code we are building transformMatrix <\/em>which will move created rectangle to it’s place.<\/p>\n\n\n\n For example, “front” side case, lines 72 to 79. This side faces us as is, so we’ll need just to shift it along Z axis closer to us, in +Z direction. “+Z” is because OpenGL has right-handed coordinate system<\/strong>:<\/p>\n\n\n\n Line 116, startGroup()<\/em>. We are about to create a set of actual vertices and triangles, then we will need to move them. The concept of “group” will allow us to move only what we need, without touching previously created vertices. startGroup()<\/em> saves starting array positions of our future vertices and triangles.<\/p>\n\n\n\n Lines 118 to 139 – were we’re actually creating vertices and triangles. This code allows to build not only simple 4 vertices rectangle, but also a “net”.<\/p>\n\n\n\n Then, lines 141 to 146 – moving vertices to their final positions.<\/p>\n\n\n\n Now back to TheGame.cpp<\/em>.<\/p>\n\n\n\n Please note, line 51: we are adjusting current Material <\/em>(setting color to Blue), then calling pMB->useMaterial(&mt)<\/em>. This command checks if we have such material in ModelBuilder’s materialsList<\/em> already, if not – creates a new one and adds it to the list. And sets usingMaterialN <\/em>variable to corresponding value. So all following vertices will have new materialN<\/em>.<\/p>\n\n\n\n So, after line 52 we have 24 vertices and 12 triangles (6 sides, 36 indices), all with subjN 0 and with 2 different material numbers (first 5 sides with material #0, and the last one – with material #1).<\/p>\n\n\n\n Now the key function, pMB->buildDrawJobs()<\/em>, line 54. This function takes these vertices and triangles arrays, extracts from them sub-arrays for each subj\/material and builds corresponding DrawJobs<\/em>. You can see it in ModelBuilder.cpp<\/em>, line 197.<\/p>\n\n\n\n After extracting sub-arrays for a single DrawJob <\/em>it rearranges vertices order and builds corresponding VBOs, EBOs and VAOs.<\/p>\n\n\n\n Line 56 – don’t forget to delete created objects to avoid memory leaks.<\/p>\n\n\n\n Hope now everything is more-or-less clear. Let’s try it.<\/p>\n\n\n\n 5. Build an run. Result:<\/p>\n\n\n\n <\/p>\n\n\n\n\n#pragma once\n#include <string>\n#include <vector>\n#include "Vertex01.h"\n#include "Triangle01.h"\n#include "VirtualShape.h"\n#include "Group01.h"\n#include "Material.h"\n#include "GameSubj.h"\n\nclass ModelBuilder\n{\npublic:\n\tstd::vector<Vertex01*> vertices;\n\tstd::vector<Triangle01*> triangles;\n\tstd::vector<VirtualShape*> vShapesStack;\n\tstd::vector<Group01*> groupsStack;\n\tstd::vector<Material*> materialsList;\n\tstd::vector<int> subjNumbersList;\n\tint usingSubjN = -1;\n\tint usingMaterialN = -1;\n\tGroup01* pCurrentGroup = NULL;\npublic:\n\tvirtual ~ModelBuilder();\n\tint useSubjN(int subjN) { return useSubjN(this, subjN); };\n\tstatic int useSubjN(ModelBuilder* pMB, int subjN);\n\tint useMaterial(Material* pMT) { return useMaterial(this, pMT); };\n\tstatic int useMaterial(ModelBuilder* pMB, Material* pMT);\n\tint buildBoxFace(std::string applyTo, VirtualShape* pVS) { return buildBoxFace(this, applyTo, pVS); };\n\tstatic int buildBoxFace(ModelBuilder* pMB, std::string applyTo, VirtualShape* pVS);\n\tstatic void startGroup(ModelBuilder* pMB);\n\tstatic void endGroup(ModelBuilder* pMB);\n\tstatic int addVertex(ModelBuilder* pMB, float kx, float ky, float kz, float nx, float ny, float nz);\n\tstatic int add2triangles(ModelBuilder* pMB, int nNW, int nNE, int nSW, int nSE, int n);\n\tstatic int addTriangle(ModelBuilder* pMB, int n0, int n1, int n2);\n\tint buildDrawJobs(std::vector<GameSubj*> gameSubjs) { return buildDrawJobs(this, gameSubjs); };\n\tstatic int buildDrawJobs(ModelBuilder* pMB, std::vector<GameSubj*> gameSubjs);\n\tstatic int rearrangeArraysForDrawJob(ModelBuilder* pMB, std::vector<Vertex01*> allVertices, std::vector<Vertex01*> useVertices, std::vector<Triangle01*> useTriangles);\n\tstatic int buildSingleDrawJob(Material* pMT, std::vector<Vertex01*> useVertices, std::vector<Triangle01*> useTriangles);\n};\n\n<\/pre><\/div>\n\n\n
\n\n\n\n\n#include "ModelBuilder.h"\n#include "platform.h"\n#include "utils.h"\n#include "DrawJob.h"\n#include "Shader.h"\n\nextern float degrees2radians;\n\nModelBuilder::~ModelBuilder() {\n\t\/\/clear all vectors\n\tint itemsN = vertices.size();\n\tfor (int i = 0; i < itemsN; i++)\n\t\tdelete vertices.at(i);\n\tvertices.clear();\n\n\titemsN = triangles.size();\n\tfor (int i = 0; i < itemsN; i++)\n\t\tdelete triangles.at(i);\n\ttriangles.clear();\n\n\titemsN = vShapesStack.size();\n\tfor (int i = 0; i < itemsN; i++)\n\t\tdelete vShapesStack.at(i);\n\tvShapesStack.clear();\n\n\titemsN = groupsStack.size();\n\tfor (int i = 0; i < itemsN; i++)\n\t\tdelete groupsStack.at(i);\n\tgroupsStack.clear();\n\n\titemsN = materialsList.size();\n\tfor (int i = 0; i < itemsN; i++)\n\t\tdelete materialsList.at(i);\n\tmaterialsList.clear();\n\n\tsubjNumbersList.clear();\n}\nint ModelBuilder::useSubjN(ModelBuilder* pMB, int subjN) {\n\tpMB->usingSubjN = subjN;\n\tint itemsN = pMB->subjNumbersList.size();\n\tbool newN = true;\n\tif (itemsN > 0)\n\t\tfor (int i = 0; i < itemsN; i++)\n\t\t\tif (pMB->subjNumbersList.at(i) == subjN) {\n\t\t\t\tnewN = false;\n\t\t\t\tbreak;\n\t\t\t}\n\tif (newN)\n\t\tpMB->subjNumbersList.push_back(subjN);\n\treturn subjN;\n}\nint ModelBuilder::useMaterial(ModelBuilder* pMB, Material* pMT) {\n\tint itemsN = pMB->materialsList.size();\n\tif (itemsN > 0)\n\t\tfor (int i = 0; i < itemsN; i++)\n\t\t\tif (memcmp(pMB->materialsList.at(i), pMT, sizeof(Material)) == 0) {\n\t\t\t\tpMB->usingMaterialN = i;\n\t\t\t\treturn i;\n\t\t\t}\n\t\/\/if here - add new material to the list\n\tpMB->usingMaterialN = itemsN;\n\t\/\/create a copy of new Material and add to the list\n\tMaterial* pMTnew = new Material(*pMT);\n\tpMB->materialsList.push_back(pMTnew);\n\treturn itemsN;\n}\nint ModelBuilder::buildBoxFace(ModelBuilder* pMB, std::string applyTo, VirtualShape* pVS) {\n\t\/\/this code is for simple box\n\tVirtualShape vs; \/\/face VS, \n\tmat4x4 transformMatrix = { 1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0,1 };\n\t\/\/rotate desirable side to face us. \n\tif (applyTo.find("front") == 0) {\n\t\t\/\/Side <front> is facing us as is.\n\t\tvs.whl[0] = pVS->whl[0];\n\t\tvs.whl[1] = pVS->whl[1];\n\t\t\/\/define how to move\/place generated face back to the VirtualShape\n\t\t\/\/just shift closer to us by length\/2\n\t\tmat4x4_translate(transformMatrix, 0, 0, pVS->whl[2] \/ 2);\n\t}\n\telse if (applyTo.find("back") == 0) {\n\t\tvs.whl[0] = pVS->whl[0];\n\t\tvs.whl[1] = pVS->whl[1];\n\t\t\/\/rotate 180 degrees around Y and shift farther from us by half-length\n\t\tmat4x4_translate(transformMatrix, 0, 0, -pVS->whl[2] \/ 2);\n\t\tmat4x4_rotate_Y(transformMatrix, transformMatrix, degrees2radians * 180);\n\t}\n\telse if (applyTo.find("left") == 0) {\n\t\tvs.whl[0] = pVS->whl[2]; \/\/width = original length\n\t\tvs.whl[1] = pVS->whl[1];\n\t\t\/\/rotate -90 degrees around Y (CW) and shift half-width to the left\n\t\tmat4x4_translate(transformMatrix, -pVS->whl[0] \/ 2, 0, 0);\n\t\tmat4x4_rotate_Y(transformMatrix, transformMatrix, -degrees2radians * 90);\n\t}\n\telse if (applyTo.find("right") == 0) {\n\t\tvs.whl[0] = pVS->whl[2]; \/\/width = original length\n\t\tvs.whl[1] = pVS->whl[1];\n\t\t\/\/rotate +90 degrees around Y (CCW) and shift half-width to the right\n\t\tmat4x4_translate(transformMatrix, pVS->whl[0] \/ 2, 0, 0);\n\t\tmat4x4_rotate_Y(transformMatrix, transformMatrix, degrees2radians * 90);\n\t}\n\telse if (applyTo.find("top") == 0) {\n\t\tvs.whl[0] = pVS->whl[0];\n\t\tvs.whl[1] = pVS->whl[2]; \/\/height = original length\n\t\t\/\/rotate -90 degrees around X (CW) and 180 around Y, and shift half-height up\n\t\tmat4x4_translate(transformMatrix, 0, pVS->whl[1] \/ 2, 0);\n\t\tmat4x4_rotate_Y(transformMatrix, transformMatrix, -degrees2radians * 180);\n\t\tmat4x4_rotate_X(transformMatrix, transformMatrix, -degrees2radians * 90);\n\t}\n\telse if (applyTo.find("bottom") == 0) {\n\t\tvs.whl[0] = pVS->whl[0];\n\t\tvs.whl[1] = pVS->whl[2]; \/\/height = original length\n\t\t\/\/rotate 90 around X (CCW) and shift half-height down\n\t\tmat4x4_translate(transformMatrix, 0, -pVS->whl[1] \/ 2, 0);\n\t\tmat4x4_rotate_X(transformMatrix, transformMatrix, degrees2radians * 90);\n\t}\n\tstartGroup(pMB);\n\t\/\/create vertices\n\tint sectionsX = 1;\n\tint sectionsY = 1;\n\tint pointsX = sectionsX + 1;\n\tint pointsY = sectionsY + 1;\n\tfloat stepX = vs.whl[0] \/ sectionsX;\n\tfloat stepY = vs.whl[1] \/ sectionsY;\n\tfloat kY = vs.whl[1] \/ 2;\n\tfor (int iy = 0; iy < pointsY; iy++) {\n\t\tfloat kX = -vs.whl[0] \/ 2;\n\t\tfor (int ix = 0; ix < pointsX; ix++) {\n\t\t\tint nSE = addVertex(pMB, kX, kY, 0, 0, 0, 1); \/\/vertex number on south-east\n\t\t\tif (iy > 0 && ix > 0) {\n\t\t\t\t\/\/add 2 triangles\n\t\t\t\tint nSW = nSE - 1; \/\/vertex number south-west\n\t\t\t\tint nNE = nSE - pointsX; \/\/north-east\n\t\t\t\tint nNW = nSW - pointsX; \/\/north-west\n\t\t\t\tadd2triangles(pMB, nNW, nNE, nSW, nSE, iy + ix);\n\t\t\t}\n\t\t\tkX += stepX;\n\t\t}\n\t\tkY -= stepY;\n\t}\n\t\/\/move face to it's place (apply transform matrix)\n\tint vertsN = pMB->vertices.size();\n\tfor (int i = pMB->pCurrentGroup->fromVertexN; i < vertsN; i++) {\n\t\tVertex01* pVX = pMB->vertices.at(i);\n\t\tmat4x4_mul_vec4plus(pVX->aPos, transformMatrix, pVX->aPos, 1);\n\t\tmat4x4_mul_vec4plus(pVX->aNormal, transformMatrix, pVX->aNormal, 0);\n\t}\n\tendGroup(pMB);\n\treturn 1;\n}\nint ModelBuilder::add2triangles(ModelBuilder* pMB, int nNW, int nNE, int nSW, int nSE, int n) {\n\t\/\/indexes: NorthWest, NorthEast, SouthWest,SouthEast\n\tif (n % 2 == 0) { \/\/even number\n\t\taddTriangle(pMB, nNW, nSW, nNE);\n\t\taddTriangle(pMB, nNE, nSW, nSE);\n\t}\n\telse { \/\/odd number\n\t\taddTriangle(pMB, nNW, nSE, nNE);\n\t\taddTriangle(pMB, nNW, nSW, nSE);\n\t}\n\treturn pMB->triangles.size() - 1;\n}\nint ModelBuilder::addTriangle(ModelBuilder* pMB, int i0, int i1, int i2) {\n\tTriangle01* pTR = new Triangle01();\n\tpMB->triangles.push_back(pTR);\n\tpTR->idx[0] = i0;\n\tpTR->idx[1] = i1;\n\tpTR->idx[2] = i2;\n\tpTR->subjN = pMB->usingSubjN;\n\tpTR->materialN = pMB->usingMaterialN;\n\treturn pMB->triangles.size() - 1;\n}\nvoid ModelBuilder::startGroup(ModelBuilder* pMB) {\n\tpMB->pCurrentGroup = new Group01();\n\tpMB->groupsStack.push_back(pMB->pCurrentGroup);\n\tpMB->pCurrentGroup->fromVertexN = pMB->vertices.size();\n\tpMB->pCurrentGroup->fromTriangleN = pMB->triangles.size();\n}\nvoid ModelBuilder::endGroup(ModelBuilder* pMB) {\n\tdelete pMB->pCurrentGroup;\n\tpMB->pCurrentGroup = pMB->groupsStack.back();\n\tpMB->groupsStack.pop_back();\n}\nint ModelBuilder::addVertex(ModelBuilder* pMB, float kx, float ky, float kz, float nx, float ny, float nz) {\n\tVertex01* pVX = new Vertex01();\n\tpMB->vertices.push_back(pVX);\n\tpVX->aPos[0] = kx;\n\tpVX->aPos[1] = ky;\n\tpVX->aPos[2] = kz;\n\t\/\/normal\n\tpVX->aNormal[0] = nx;\n\tpVX->aNormal[1] = ny;\n\tpVX->aNormal[2] = nz;\n\tpVX->subjN = pMB->usingSubjN;\n\tpVX->materialN = pMB->usingMaterialN;\n\treturn pMB->vertices.size() - 1;\n}\nint ModelBuilder::buildDrawJobs(ModelBuilder* pMB, std::vector<GameSubj*> gameSubjs) {\n\tint totalSubjsN = pMB->subjNumbersList.size();\n\tif (totalSubjsN < 1) {\n\t\tpMB->subjNumbersList.push_back(-1);\n\t\ttotalSubjsN = 1;\n\t}\n\tint totalMaterialsN = pMB->materialsList.size();\n\tif (totalSubjsN < 2 && totalMaterialsN < 2) {\n\t\t\/\/simple single DrawJob\n\t\tMaterial* pMT = pMB->materialsList.at(0);\n\t\tGameSubj* pGS = NULL;\n\t\tint gsN = pMB->subjNumbersList.at(0);\n\t\tif (gsN >= 0)\n\t\t\tpGS = gameSubjs.at(gsN);\n\t\tif (pGS != NULL)\n\t\t\tpGS->djStartN = DrawJob::drawJobs.size();\n\t\tbuildSingleDrawJob(pMT, pMB->vertices, pMB->triangles);\n\t\tif (pGS != NULL)\n\t\t\tpGS->djTotalN = DrawJob::drawJobs.size() - pGS->djStartN;\n\t\treturn 1;\n\t}\n\tint totalVertsN = pMB->vertices.size();\n\tint totalTrianglesN = pMB->triangles.size();\n\t\/\/clear flags\n\tfor (int vN = 0; vN < totalVertsN; vN++) {\n\t\tVertex01* pVX = pMB->vertices.at(vN);\n\t\tpVX->flag = 0;\n\t}\n\tfor (int tN = 0; tN < totalTrianglesN; tN++) {\n\t\tTriangle01* pTR = pMB->triangles.at(tN);\n\t\tpTR->flag = 0;\n\t}\n\tint addedDJs = 0;\n\tfor (int sN = 0; sN < totalSubjsN; sN++) {\n\t\tGameSubj* pGS = NULL;\n\t\tint gsN = pMB->subjNumbersList.at(sN);\n\t\tif (gsN >= 0)\n\t\t\tpGS = gameSubjs.at(gsN);\n\t\tif (pGS != NULL)\n\t\t\tpGS->djStartN = DrawJob::drawJobs.size();\n\t\tfor (int mtN = 0; mtN < totalMaterialsN; mtN++) {\n\t\t\tMaterial* pMT = pMB->materialsList.at(mtN);\n\t\t\tstd::vector<Vertex01*> useVertices;\n\t\t\tstd::vector<Triangle01*> useTriangles;\n\t\t\tfor (int vN = 0; vN < totalVertsN; vN++) {\n\t\t\t\tVertex01* pVX = pMB->vertices.at(vN);\n\t\t\t\tif (pVX->flag != 0)\n\t\t\t\t\tcontinue;\n\t\t\t\tif (pVX->subjN != gsN)\n\t\t\t\t\tcontinue;\n\t\t\t\tif (pVX->materialN != mtN)\n\t\t\t\t\tcontinue;\n\t\t\t\t\/\/if here - make a copy\n\t\t\t\tVertex01* pVX2 = new Vertex01(*pVX);\n\t\t\t\tuseVertices.push_back(pVX2);\n\t\t\t\tpVX2->altN = vN;\n\t\t\t\tpVX->flag = 1;\n\t\t\t\tif (pVX->endOfSequence > 0) {\n\t\t\t\t\trearrangeArraysForDrawJob(pMB, pMB->vertices, useVertices, useTriangles);\n\t\t\t\t\tbuildSingleDrawJob(pMT, useVertices, useTriangles);\n\t\t\t\t\taddedDJs++;\n\t\t\t\t\t\/\/clear and proceed to next sequence\n\t\t\t\t\tint useVerticesN = useVertices.size();\n\t\t\t\t\tfor (int i = 0; i < useVerticesN; i++)\n\t\t\t\t\t\tdelete useVertices.at(i);\n\t\t\t\t\tuseVertices.clear();\n\t\t\t\t}\n\t\t\t}\n\t\t\tint useVerticesN = useVertices.size();\n\t\t\tif (useVerticesN < 1)\n\t\t\t\tcontinue; \/\/to next material\n\t\t\t\/\/pick triangles\n\t\t\tfor (int tN = 0; tN < totalTrianglesN; tN++) {\n\t\t\t\tTriangle01* pTR = pMB->triangles.at(tN);\n\t\t\t\tif (pTR->flag != 0)\n\t\t\t\t\tcontinue;\n\t\t\t\tif (pTR->subjN != gsN)\n\t\t\t\t\tcontinue;\n\t\t\t\tif (pTR->materialN != mtN)\n\t\t\t\t\tcontinue;\n\t\t\t\t\/\/if here - make a copy\n\t\t\t\tTriangle01* pTR2 = new Triangle01(*pTR);\n\t\t\t\tuseTriangles.push_back(pTR2);\n\t\t\t\tpTR->flag = 1;\n\t\t\t}\n\t\t\trearrangeArraysForDrawJob(pMB, pMB->vertices, useVertices, useTriangles);\n\t\t\tbuildSingleDrawJob(pMT, useVertices, useTriangles);\n\t\t\taddedDJs++;\n\t\t\t\/\/clear all for next material\n\t\t\tfor (int i = 0; i < useVerticesN; i++)\n\t\t\t\tdelete useVertices.at(i);\n\t\t\tuseVertices.clear();\n\t\t\tint useTrianglesN = useTriangles.size();\n\t\t\tfor (int i = 0; i < useTrianglesN; i++)\n\t\t\t\tdelete useTriangles.at(i);\n\t\t\tuseTriangles.clear();\n\t\t}\n\t\tif (pGS != NULL)\n\t\t\tpGS->djTotalN = DrawJob::drawJobs.size() - pGS->djStartN;\n\t}\n\treturn addedDJs;\n}\nint ModelBuilder::buildSingleDrawJob(Material* pMT, std::vector<Vertex01*> useVertices, std::vector<Triangle01*> useTriangles) {\n\tint totalVertsN = useVertices.size();\n\tif (totalVertsN < 1)\n\t\treturn 1;\n\tDrawJob* pDJ = new DrawJob();\n\t\/\/copy material to DJ\n\tmemcpy(&pDJ->mt, pMT, sizeof(Material));\n\t\/\/calculate VBO element size (stride) and variables offsets in VBO\n\tint VBOid = DrawJob::newBufferId();\n\tint stride = 0;\n\tpDJ->setDesirableOffsets(&stride, pDJ->mt.shaderN, VBOid);\n\t\/\/create an array for VBO\n\tint bufferSize = totalVertsN * stride;\n\tfloat* vertsBuffer = new float[bufferSize];\n\t\/\/fill vertsBuffer\n\tShader* pSh = Shader::shaders.at(pDJ->mt.shaderN);\n\tint floatSize = sizeof(float);\n\tfor (int vN = 0; vN < totalVertsN; vN++) {\n\t\tVertex01* pVX = useVertices.at(vN);\n\t\tint idx = vN * stride \/ floatSize;\n\t\t\/\/pick data from vertex and move to the buffer\n\t\tmemcpy(&vertsBuffer[idx + pDJ->aPos.offset \/ floatSize], pVX->aPos, 3 * floatSize);\n\t\tif (pSh->l_aTuv >= 0) \/\/attribute TUV (texture coordinates)\n\t\t\tmemcpy(&vertsBuffer[idx + pDJ->aTuv.offset \/ floatSize], pVX->aTuv, 2 * floatSize);\n\t}\n\t\/\/buffer is ready, create VBO\n\tglBindBuffer(GL_ARRAY_BUFFER, VBOid);\n\tglBufferData(GL_ARRAY_BUFFER, bufferSize * floatSize, vertsBuffer, GL_STATIC_DRAW);\n\tdelete[] vertsBuffer;\n\tpDJ->pointsN = totalVertsN;\n\n\tint totalTrianglesN = useTriangles.size();\n\tif (totalTrianglesN > 0) {\n\t\t\/\/create EBO\n\t\tint totalIndexesN = totalTrianglesN * 3;\n\t\t\/\/create buffer\n\t\tGLushort* indexBuffer = new GLushort[totalIndexesN];\n\t\tfor (int tN = 0; tN < totalTrianglesN; tN++) {\n\t\t\tTriangle01* pTR = useTriangles[tN];\n\t\t\tint idx = tN * 3;\n\t\t\tindexBuffer[idx + 0] = (GLushort)pTR->idx[0];\n\t\t\tindexBuffer[idx + 1] = (GLushort)pTR->idx[1];\n\t\t\tindexBuffer[idx + 2] = (GLushort)pTR->idx[2];\n\t\t}\n\t\t\/\/buffer is ready, create IBO\n\t\tpDJ->glEBOid = DrawJob::newBufferId();\n\t\tglBindBuffer(GL_ELEMENT_ARRAY_BUFFER, pDJ->glEBOid);\n\t\tglBufferData(GL_ELEMENT_ARRAY_BUFFER, totalIndexesN * sizeof(GLushort), indexBuffer, GL_STATIC_DRAW);\n\t\tdelete[] indexBuffer;\n\t\tpDJ->pointsN = totalIndexesN;\n\t}\n\t\/\/create and fill vertex attributes array (VAO)\n\tpDJ->buildVAO();\n\treturn 1;\n}\nint ModelBuilder::rearrangeArraysForDrawJob(ModelBuilder* pMB, std::vector<Vertex01*> allVertices, std::vector<Vertex01*> useVertices, std::vector<Triangle01*> useTriangles) {\n\tint totalTrianglesN = useTriangles.size();\n\tif (totalTrianglesN < 1)\n\t\treturn 0;\n\tint totalVerticesN = useVertices.size();\n\t\/\/save new vertices order in original vertices array\n\t\/\/since triangles indices refer to original vertices order\n\tfor (int i = 0; i < totalVerticesN; i++) {\n\t\tVertex01* pVX1 = useVertices.at(i);\n\t\tVertex01* pVX0 = allVertices.at(pVX1->altN);\n\t\tpVX0->altN = i;\n\t}\n\t\/\/replace triangle original indices by new numbers saved in original vertices altN\n\tfor (int tN = 0; tN < totalTrianglesN; tN++) {\n\t\tTriangle01* pTR = useTriangles.at(tN);\n\t\tfor (int i = 0; i < 3; i++) {\n\t\t\tVertex01* pVX0 = allVertices.at(pTR->idx[i]);\n\t\t\tpTR->idx[i] = pVX0->altN;\n\t\t}\n\t}\n\treturn 1;\n}\n\n<\/pre><\/div>\n\n\n
\n\n\n\n\n#include "TheGame.h"\n#include "platform.h"\n#include "utils.h"\n#include "linmath.h"\n#include "Texture.h"\n#include "Shader.h"\n#include "DrawJob.h"\n#include "ModelBuilder.h"\n\nextern std::string filesRoot;\n\nstd::vector<GameSubj*> TheGame::gameSubjs;\n\nint TheGame::getReady() {\n bExitGame = false;\n Shader::loadShaders();\n glEnable(GL_CULL_FACE);\n\n \/\/=== create box ========================\n GameSubj* pGS = new GameSubj();\n gameSubjs.push_back(pGS);\n\n pGS->name.assign("box1");\n pGS->ownCoords.setPosition(0, 0, 0);\n pGS->ownCoords.setDegrees(0, 0, 0);\n pGS->ownSpeed.setDegrees(1.5, -2, 1);\n\n ModelBuilder* pMB = new ModelBuilder();\n pMB->useSubjN(gameSubjs.size() - 1);\n\n \/\/define VirtualShape\n VirtualShape vs;\n vs.type.assign("box");\n vs.whl[0] = 100;\n vs.whl[1] = 200;\n vs.whl[2] = 400;\n\n Material mt;\n \/\/define material - flat red\n mt.shaderN = Shader::spN_flat_ucolor;\n mt.primitiveType = GL_TRIANGLES;\n mt.uColor.setRGBA(255, 0, 0,255); \/\/red\n pMB->useMaterial(&mt);\n\n pMB->buildBoxFace("front", &vs);\n pMB->buildBoxFace("back", &vs);\n pMB->buildBoxFace("top", &vs);\n pMB->buildBoxFace("bottom", &vs);\n pMB->buildBoxFace("left", &vs);\n\n mt.uColor.setRGBA(0, 0, 255,255); pMB->useMaterial(&mt); \/\/blue\n pMB->buildBoxFace("right", &vs);\n\n pMB->buildDrawJobs(gameSubjs);\n\n delete pMB;\n\n return 1;\n}\nint TheGame::drawFrame() {\n myPollEvents();\n\n \/\/glClearColor(0.0, 0.0, 0.5, 1.0);\n glClear(GL_COLOR_BUFFER_BIT);\n mat4x4 mProjection, mMVP;\n mat4x4_ortho(mProjection, -(float)screenSize[0] \/ 2, (float)screenSize[0] \/ 2, -(float)screenSize[1] \/ 2, (float)screenSize[1] \/ 2, 400.f, -400.f);\n\n \/\/scan subjects\n int subjsN = gameSubjs.size();\n for (int subjN = 0; subjN < subjsN; subjN++) {\n GameSubj* pGS = gameSubjs.at(subjN);\n \/\/behavior - apply rotation speed\n pGS->moveSubj();\n \/\/prepare subject for rendering\n pGS->buildModelMatrix(pGS);\n \/\/build MVP matrix for given subject\n mat4x4_mul(mMVP, mProjection, pGS->ownModelMatrix);\n \/\/render subject\n for (int i = 0; i < pGS->djTotalN; i++) {\n DrawJob* pDJ = DrawJob::drawJobs.at(pGS->djStartN + i);\n pDJ->execute((float*)mMVP, NULL);\n }\n }\n mySwapBuffers();\n return 1;\n}\nint TheGame::cleanUp() {\n int itemsN = gameSubjs.size();\n \/\/delete all UISubjs\n for (int i = 0; i < itemsN; i++) {\n GameSubj* pGS = gameSubjs.at(i);\n delete pGS;\n }\n gameSubjs.clear();\n \/\/clear all other classes\n Texture::cleanUp();\n Shader::cleanUp();\n DrawJob::cleanUp();\n return 1;\n}\nint TheGame::onScreenResize(int width, int height) {\n if (screenSize[0] == width && screenSize[1] == height)\n return 0;\n screenSize[0] = width;\n screenSize[1] = height;\n screenRatio = (float)width \/ (float)height;\n glViewport(0, 0, width, height);\n mylog(" screen size %d x %d\\n", width, height);\n return 1;\n}\nint TheGame::run() {\n getReady();\n while (!bExitGame) {\n drawFrame();\n }\n cleanUp();\n return 1;\n}\n\n<\/pre><\/div>\n\n\n![](\"https:\/\/writingagame.com\/img\/b01\/c17\/01.jpg\")
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