opengl 知识总结

矩阵堆栈  纹理堆栈

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绘制黑白格地面

GLfloat fExtent = 20.0f;
    GLfloat fStep = 0.5f;
    GLfloat y = 0.0f;
    GLfloat fColor;
    GLfloat iStrip, iRun;
    GLint iBounce = 0;

for(iStrip = -fExtent; iStrip <= fExtent; iStrip += fStep)
        {
        glBegin(GL_TRIANGLE_STRIP);
            for(iRun = fExtent; iRun >= -fExtent; iRun -= fStep)
                {
                if((iBounce %2) == 0)
                    fColor = 1.0f;
                else
                    fColor = 0.0f;
                    
                glColor4f(fColor, fColor, fColor, 0.5f);
                glVertex3f(iStrip, y, iRun);
                glVertex3f(iStrip + fStep, y, iRun);
                
                iBounce++;
                }
        glEnd();
        }