前言
在上一篇基础上修改main.cpp文件，完成此demo。
代码
代码已做详细注释，如下：
#include "GLMatrixStack.h"#include "GLFrame.h"#include "GLFrustum.h"#include "GLBatch.h"#include "GLGeometryTransform.h"#include#include #include "GLTools.h"#include "StopWatch.h"#include GLShaderManager shaderManager;GLMatrixStack modelViewMatrix;GLMatrixStack projectionMatrix;//视景体GLFrustum viewFrustum;GLFrame cameraFrame;GLFrame objectFrame;GLBatch pyramidBatch;//纹理变量IDGLuint textureID;//绘制金字塔void makePyramid(GLBatch &pyramidBatch) { //arg2:顶点个数 arg3:这个批次类中会使用的纹理个数，默认为0 pyramidBatch.Begin(GL_TRIANGLES, 18,1); //塔顶 M3DVector3f vApex = { 0.0f, 1.0f, 0.0f }; M3DVector3f vFrontLeft = { -1.0f, -1.0f, 1.0f }; M3DVector3f vFrontRight = { 1.0f, -1.0f, 1.0f }; M3DVector3f vBackLeft = { -1.0f, -1.0f, -1.0f }; M3DVector3f vBackRight = { 1.0f, -1.0f, -1.0f }; M3DVector3f n; //设置三角形 //从三个点获取一个法线 arg1:结果 arg2-4:顶点数据 m3dFindNormal(n, vBackLeft, vBackRight, vFrontRight); //设置法线 pyramidBatch.Normal3fv(n); //设置纹理坐标 arg1:纹理层次 对于使用存储着色器来进行渲染，设置为0 arg2: 对应x坐标 arg3:对应y坐标 (s,t,r,q对应顶点坐标的x,y,z,w) pyramidBatch.MultiTexCoord2f(0, 0.0f, 0.0f); //向三角形批次类中添加顶点数据 pyramidBatch.Vertex3fv(vBackLeft); //vBackRight pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 1.0f, 0.0f); pyramidBatch.Vertex3fv(vBackRight); //vFrontRight pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 1.0f, 1.0f); pyramidBatch.Vertex3fv(vFrontRight); //三角形Y =(vFrontLeft,vBackLeft,vFrontRight) //1.找到三角形X 法线 m3dFindNormal(n, vFrontLeft, vBackLeft, vFrontRight); //vFrontLeft pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 0.0f, 1.0f); pyramidBatch.Vertex3fv(vFrontLeft); //vBackLeft pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 0.0f, 0.0f); pyramidBatch.Vertex3fv(vBackLeft); //vFrontRight pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 1.0f, 1.0f); pyramidBatch.Vertex3fv(vFrontRight); // 金字塔前面 //三角形：（Apex，vFrontLeft，vFrontRight） m3dFindNormal(n, vApex, vFrontLeft, vFrontRight); pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 0.5f, 1.0f); pyramidBatch.Vertex3fv(vApex); pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 0.0f, 0.0f); pyramidBatch.Vertex3fv(vFrontLeft); pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 1.0f, 0.0f); pyramidBatch.Vertex3fv(vFrontRight); //金字塔左边 //三角形：（vApex, vBackLeft, vFrontLeft） m3dFindNormal(n, vApex, vBackLeft, vFrontLeft); pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 0.5f, 1.0f); pyramidBatch.Vertex3fv(vApex); pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 1.0f, 0.0f); pyramidBatch.Vertex3fv(vBackLeft); pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 0.0f, 0.0f); pyramidBatch.Vertex3fv(vFrontLeft); //金字塔右边 //三角形：（vApex, vFrontRight, vBackRight） m3dFindNormal(n, vApex, vFrontRight, vBackRight); pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 0.5f, 1.0f); pyramidBatch.Vertex3fv(vApex); pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 1.0f, 0.0f); pyramidBatch.Vertex3fv(vFrontRight); pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 0.0f, 0.0f); pyramidBatch.Vertex3fv(vBackRight); //金字塔后边 //三角形：（vApex, vBackRight, vBackLeft） m3dFindNormal(n, vApex, vBackRight, vBackLeft); pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 0.5f, 1.0f); pyramidBatch.Vertex3fv(vApex); pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 0.0f, 0.0f); pyramidBatch.Vertex3fv(vBackRight); pyramidBatch.Normal3fv(n); pyramidBatch.MultiTexCoord2f(0, 1.0f, 0.0f); pyramidBatch.Vertex3fv(vBackLeft); //结束批次设置 pyramidBatch.End();}//将TGA文件加载为2D纹理bool loadTGATexture(const char *szFileName, GLenum minFilter, GLenum magFileter, GLenum wrapMode) { GLbyte *pBits; int nWidth, nHeight, nComponents; GLenum eFormat; //读取纹理 pBits:指向图像数据的指针 arg2:纹理文件宽度地址 arg4：文件组件地址 arg5:文件格式地址 pBits = gltReadTGABits(szFileName, &nWidth, &nHeight, &nComponents, &eFormat); if (pBits == NULL) { return false; } //设置过滤方式 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minFilter); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magFileter); //设置环绕模式 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrapMode); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapMode); //载入纹理 arg2:mip贴图层次 arg7:像素数据类型（GL_UNSIGNED_BYTE 每个颜色分量都是一个8位无符号整型） glTexImage2D(GL_TEXTURE_2D, 0, nComponents, nWidth, nHeight, 0, eFormat, GL_UNSIGNED_BYTE, pBits); //释放ppBits free(pBits); //加载Mip glGenerateMipmap(GL_TEXTURE_2D); return true;}void setupRC() { glClearColor(0.8f, 0.8f, 0.8f, 1.0f); shaderManager.InitializeStockShaders(); cameraFrame.MoveForward(-15.0f); glEnable(GL_DEPTH_TEST); //arg1:纹理对象个数 arg2:纹理对象指针 glGenTextures(1, &textureID); //绑定纹理状态 arg1:纹理状态2D arg2:纹理对象 glBindTexture(GL_TEXTURE_2D, textureID); loadTGATexture("stone.tga", GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR, GL_CLAMP_TO_EDGE); makePyramid(pyramidBatch);}void changeSize(int w, int h) { glViewport(0, 0, w, h); //设置透视投影 viewFrustum.SetPerspective(30.0f, float(w) / float(h), 2.0f, 400.0f); projectionMatrix.LoadMatrix(viewFrustum.GetProjectionMatrix());}void renderScene() { static GLfloat vLightPos[] = {1.0f,1.0f,0.0f}; static GLfloat vWhite[] = {1.0f,1.0f,1.0f,1.0f}; //清理缓冲区 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); modelViewMatrix.PushMatrix(); M3DMatrix44f mCamera; cameraFrame.GetCameraMatrix(mCamera); modelViewMatrix.MultMatrix(mCamera); M3DMatrix44f mObjectFrame; objectFrame.GetMatrix(mObjectFrame); modelViewMatrix.MultMatrix(mObjectFrame); glBindTexture(GL_TEXTURE_2D, textureID); //arg5:漫反射颜色 arg6:图形颜色(使用纹理时此参数为0，表示不需要设置颜色） shaderManager.UseStockShader(GLT_SHADER_TEXTURE_POINT_LIGHT_DIFF,modelViewMatrix.GetMatrix(),projectionMatrix.GetMatrix(),vLightPos, vWhite,0); pyramidBatch.Draw(); modelViewMatrix.PopMatrix(); glutSwapBuffers(); }void specialKeys(int key,int x,int y){ float angular = float(m3dDegToRad(6.0f)); if (key == GLUT_KEY_UP) { objectFrame.RotateWorld(-angular, 1.0f, 0.0f, 0.0f); } if (key == GLUT_KEY_DOWN) { objectFrame.RotateWorld(angular, 1.0f, 0.0f, 0.0f); } if (key == GLUT_KEY_LEFT) { objectFrame.RotateWorld(-angular, 0.0f, 1.0f, 0.0f); } if (key == GLUT_KEY_RIGHT) { objectFrame.RotateWorld(angular, 0.0f, 1.0f, 0.0f); } glutPostRedisplay();}//删除纹理对象void shutdownRC(void) { glDeleteTextures(1, &textureID);}int main(int argc, char* argv[]) { gltSetWorkingDirectory(argv[0]); glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH | GLUT_STENCIL); glutInitWindowSize(600, 600); glutCreateWindow("dowZhang"); glutReshapeFunc(changeSize); glutDisplayFunc(renderScene); glutSpecialFunc(specialKeys); GLenum err = glewInit(); if (GLEW_OK != err) { return 1; } setupRC(); glutMainLoop(); shutdownRC(); return 0;}复制代码
效果图：