Sphere_VertexArray版本

练手：

#include <gl/glut.h> class CVertex { public: CVertex() {} CVertex(float fv1, float fv2, float fv3, float fu, float fv, float fn1, float fn2, float fn3) { v[0] = fv1; v[1] = fv2; v[2] = fv3; t[0] = fu; t[1] = fv; n[0] = fn1; n[1] = fn2; n[2] = fn3; } float v[3]; float t[2]; float n[3]; }; class CModel { public: CModel() : pVertex(0) , pTriIndices(0) , triNum(0) {} ~CModel() { if (pVertex) { delete [] pVertex; pVertex = 0; } if (pTriIndices) { delete [] pTriIndices; pTriIndices = 0; } } //----------------------------------------------------------------------------- // Name: renderSphere() // Desc: Create a sphere centered at cy, cx, cz with radius r, and // precision p. Based on a function Written by Paul Bourke. // http://astronomy.swin.edu.au/~pbourke/opengl/sphere/ //----------------------------------------------------------------------------- void SetupSphere( float cx, float cy, float cz, float r, int p ) { verNum = (p/2 + 1) * (p+1); triNum = p * p * 3; // (p/2) * p * 2 pVertex = new CVertex[ verNum ]; pTriIndices = new int[ triNum ]; const float PI = 3.14159265358979f; const float TWOPI = 6.28318530717958f; const float PIDIV2 = 1.57079632679489f; float theta1 = 0.0; float theta2 = 0.0; float theta3 = 0.0; float ex = 0.0f; float ey = 0.0f; float ez = 0.0f; float px = 0.0f; float py = 0.0f; float pz = 0.0f; // Disallow a negative number for radius. if( r < 0 ) r = -r; // Disallow a negative number for precision. if( p < 0 ) p = -p; if( p < 4 || r <= 0 ) return; for( int i = 0; i <= p/2; ++i ) { theta1 = i * TWOPI / p - PIDIV2; for( int j = 0; j <= p; ++j ) { theta3 = j * TWOPI / p; ex = cosf(theta1) * cosf(theta3); ey = sinf(theta1); ez = cosf(theta1) * sinf(theta3); px = cx + r * ex; py = cy + r * ey; pz = cz + r * ez; pVertex[ i*(p+1) + j ] = CVertex( px, py, pz, -(j/(float)p), 2*(i)/(float)p, ex, ey, ez ); } } for (int outer=0; outer<p/2; outer++) { for (int inner=0; inner<p; inner++) { //triangle 1 pTriIndices[ ((outer*p+inner)*2)*3 + 0 ] = outer*(p+1)+inner; pTriIndices[ ((outer*p+inner)*2)*3 + 1 ] = (outer+1)*(p+1)+inner; pTriIndices[ ((outer*p+inner)*2)*3 + 2 ] = outer*(p+1)+inner+1; //triangle 2 pTriIndices[ ((outer*p+inner)*2+1)*3 + 0 ] = outer*(p+1)+inner+1; pTriIndices[ ((outer*p+inner)*2+1)*3 + 1 ] = (outer+1)*(p+1)+inner; pTriIndices[ ((outer*p+inner)*2+1)*3 + 2 ] = (outer+1)*(p+1)+inner+1; } } return; } void RenderModel() { //Set vertex arrays for torus glVertexPointer(3, GL_FLOAT, sizeof(CVertex), &pVertex[0].v); glEnableClientState(GL_VERTEX_ARRAY); glNormalPointer(GL_FLOAT, sizeof(CVertex), &pVertex[0].n); glEnableClientState(GL_NORMAL_ARRAY); glTexCoordPointer(2, GL_FLOAT, sizeof(CVertex), &pVertex[0].t); glEnableClientState(GL_TEXTURE_COORD_ARRAY); //Draw glDrawElements(GL_TRIANGLES, triNum, GL_UNSIGNED_INT, pTriIndices); //disable vertex arrays glDisableClientState(GL_VERTEX_ARRAY); glDisableClientState(GL_NORMAL_ARRAY); glDisableClientState(GL_TEXTURE_COORD_ARRAY); } protected: int* pTriIndices; CVertex* pVertex; int triNum; int verNum; };

使用：

CModel g_Sphere; g_Sphere.SetupSphere( 0.0f, 0.0f, 0.0f, 1.5f, g_nPrecision ); g_Sphere.RenderModel();