int sphereSetup(float r, float **ppVertex, float **ppTexture)
{
int count = 0;
int bw = (int)(360/angleSpan);
int bh = (int)(180/angleSpan);
count = bw*bh;
VertexPointCnt = count * 18;
TexturePointCnt = count * 12;
pVertex = malloc(VertexPointCnt * sizeof(float));
pTexture = malloc(TexturePointCnt * sizeof(float));
VertexPointCnt = 0;
if (!pTexture || !pVertex){
if (pTexture)
free(pTexture);
if (pVertex)
free(pVertex);
return -1;
}
generateVertexData(r);
generateTexCoor();
vCount = VertexPointCnt/3;
*ppVertex = pVertex;
*ppTexture = pTexture;
return vCount;
}
void Moon::initVertexData(float r)
{
//顶点坐标数据的初始化================begin============================
const float UNIT_SIZE=0.5f;
const float angleSpan=10;//将球进行单位切分的角度
float alVertixs[11664];//36*18*6*3
static float *alVertix;
alVertix = alVertixs;
for(float vAngle=90;vAngle>-90;vAngle=vAngle-angleSpan){//垂直方向angleSpan度一份
for(float hAngle=360;hAngle>0;hAngle=hAngle-angleSpan){//水平方向angleSpan度一份
//纵向横向各到一个角度后计算对应的此点在球面上的坐标
double xozLength=r*UNIT_SIZE*cos(toRadians(vAngle));
float x1=(float)(xozLength*cos(toRadians(hAngle)));
float z1=(float)(xozLength*sin(toRadians(hAngle)));
float y1=(float)(r*UNIT_SIZE*sin(toRadians(vAngle)));
xozLength=r*UNIT_SIZE*cos(toRadians(vAngle-angleSpan));
float x2=(float)(xozLength*cos(toRadians(hAngle)));
float z2=(float)(xozLength*sin(toRadians(hAngle)));
float y2=(float)(r*UNIT_SIZE*sin(toRadians(vAngle-angleSpan)));
xozLength=r*UNIT_SIZE*cos(toRadians(vAngle-angleSpan));
float x3=(float)(xozLength*cos(toRadians(hAngle-angleSpan)));
float z3=(float)(xozLength*sin(toRadians(hAngle-angleSpan)));
float y3=(float)(r*UNIT_SIZE*sin(toRadians(vAngle-angleSpan)));
xozLength=r*UNIT_SIZE*cos(toRadians(vAngle));
float x4=(float)(xozLength*cos(toRadians(hAngle-angleSpan)));
float z4=(float)(xozLength*sin(toRadians(hAngle-angleSpan)));
float y4=(float)(r*UNIT_SIZE*sin(toRadians(vAngle)));
//构建第一三角形
*alVertix = x1;
alVertix++;
*alVertix = y1;
alVertix++;
*alVertix = z1;
alVertix++;
*alVertix = x2;
alVertix++;
*alVertix = y2;
alVertix++;
*alVertix = z2;
alVertix++;
*alVertix = x4;
alVertix++;
*alVertix = y4;
alVertix++;
*alVertix = z4;
alVertix++;
//构建第二三角形
*alVertix = x4;
alVertix++;
*alVertix = y4;
alVertix++;
*alVertix = z4;
alVertix++;
*alVertix = x2;
alVertix++;
*alVertix = y2;
alVertix++;
*alVertix = z2;
alVertix++;
*alVertix = x3;
alVertix++;
*alVertix = y3;
alVertix++;
*alVertix = z3;
alVertix++;
}}
vCount=11664/3;//顶点的数量为坐标值数量的1/3，因为一个顶点有3个坐标
//将alVertix中的坐标值转存到一个float数组中
int count = 11664;
static float ver[11664];
for(int i=0;i<count;i++)
{
ver[i] = alVertixs[i];
}
mVertexBuffer = ver;
static float tex[7776];
generateTexCoor(36, 18, tex);
mTexCoorBuffer = tex;
}
