OpenGL ES画球

#include"PVRShell.h"

#include"PVRShellAPI.h"

#include

#define PI_ 3.14159265358979323846

class CLesson2 : public PVRShell

{

float DegToRad(float deg);

public:

virtual bool InitApplication();

virtual bool InitView();

virtual bool ReleaseView();

virtual bool QuitApplication();

virtual bool RenderScene();

protected:

private:

};

bool CLesson2::InitApplication()

{

return true;

}

bool CLesson2::QuitApplication()

{

return true;

}

//这个函数抠至gult|es

void PlotSpherePoints(GLfloat radius, GLint stacks, GLint slices, GLfloat* v, GLfloat* n, GLfloat* t)

{

GLint i, j;

GLfloat slicestep, stackstep;

stackstep = ((GLfloat)PI_) / stacks;

slicestep = 2.0f * ((GLfloat)PI_) / slices;

for (i = 0; i < stacks; ++i)

{

GLfloat a = i * stackstep;

GLfloat b = a + stackstep;

GLfloat s0 = (GLfloat)sin(a); GLfloat s1 = (GLfloat)sin(b);

GLfloat c0 = (GLfloat)cos(a); GLfloat c1 = (GLfloat)cos(b);

for (j = 0; j <= slices; ++j)

{

GLfloat c = j * slicestep;

GLfloat x = (GLfloat)cos(c);

GLfloat y = (GLfloat)sin(c);

*n = x * s0;

*v = *n * radius;

n++;

v++;

*n = y * s0;

*v = *n * radius;

n++;

v++;

*n = c0;

*v = *n * radius;

n++;

v++;

*n = x * s1;

*v = *n * radius;

n++;

v++;

*n = y * s1;

*v = *n * radius;

n++;

v++;

*n = c1;

*v = *n * radius;

n++;

v++;

*t = 0.0f;t++;

*t = 0.0f;t++;

*t = 1.0f;t++;

*t = 0.0f;t++;

*t = 0.5f;t++;

*t = -1.0f;t++;

}

}

}

int iS = 720;

GLint slices = 100;//圆的轴数，轴越多圆弧越弯曲

GLint stacks = 500;//饱和度，值越大，越鼓

GLfloat radius = 0.4f;//半径

static GLfloat* v, *n, *t;

GLuint m_ui32Texture;

bool CLesson2::InitView()

{

//球顶点

v = (GLfloat*)malloc(stacks*(slices+1)*2*3*sizeof *v);

//球法线

n = (GLfloat*)malloc(stacks*(slices+1)*2*3*sizeof *n);

//球纹理

t = (GLfloat*)malloc(stacks*(slices+1)*2*3*sizeof *n);

PlotSpherePoints(radius, stacks, slices, v, n,t);

glEnable(GL_LIGHTING);

glEnable(GL_LIGHT0);

GLfloat position[] = { 0.5, 0.5, -1.0, 0.0 };

glEnable(GL_DEPTH_TEST);

glLightfv(GL_LIGHT0, GL_POSITION, position);

/*

GLfloat mat[3] = {0.1745, 0.01175, 0.01175};

glMaterialfv (GL_FRONT_AND_BACK, GL_AMBIENT, mat);//环境光mat[0] = 0.04136; mat[1] = 0.04136; mat[2] = 0.61424;

glMaterialfv (GL_FRONT_AND_BACK, GL_DIFFUSE, mat);//散射光mat[0] = 0.727811; mat[1] = 0.626959; mat[2] = 0.626959;

glMaterialfv (GL_FRONT_AND_BACK, GL_SPECULAR, mat);//聚光

glMaterialf (GL_FRONT_AND_BACK, GL_SHININESS, 0.6*128.0);

*/

//增加纹理

glEnable(GL_TEXTURE_2D);

glGenTextures(1, &m_ui32Texture);

int g_i32TexSize = 128;

GLuint* pTexData = new GLuint[g_i32TexSize*g_i32TexSize];

for(int i = 0; i < g_i32TexSize; ++i)

{

for(int j = 0; j < g_i32TexSize; ++j)

{

// Fills the data with a fancy pattern

GLuint col = (255L<<24) + ((255L-j*2)<<16) + ((255L-i)<<8) + (255L-i*2);

if( ((i*j)/8) % 2 )

col = 0xffff00ff;

pTexData[j*g_i32TexSize+i] = col;

}

}

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, g_i32TexSize, g_i32TexSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, pTexData);

glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );

glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );

return true;

}

bool CLesson2::ReleaseView()

{

return true;

}

PVRShell * NewDemo(void)

{

return new CLesson2();

}

bool CLesson2::RenderScene()

{

GLint i, triangles;

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glV ertexPointer(3, GL_FLOA T, 0, v);

glNormalPointer(GL_FLOA T, 0, n);

glTexCoordPointer(2,GL_FLOA T,0,t);

glEnableClientState (GL_VERTEX_ARRAY);

glEnableClientState (GL_NORMAL_ARRAY);

glEnableClientState (GL_TEXTURE_COORD_ARRAY);

triangles = (slices + 1) * 2;

for(i = 0; i < stacks; i++)

glDrawArrays(GL_TRIANGLE_STRIP, i * triangles, triangles);

glDisableClientState(GL_VERTEX_ARRAY);

glDisableClientState(GL_NORMAL_ARRAY);

glDisableClientState(GL_TEXTURE_COORD_ARRAY);

return true;

}

球一定要有光照，没有光照不叫球。你看太阳能看出是个球么？他更像圆盘，其实他确实是球。光照效果没有把他呈现成球。我还加了纹理效果，当然看官们可以把纹理关闭。