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Grass.cpp
资源名称：3dexplorerTest.rar　[点击查看]
上传用户：hkb425
上传日期：2007-06-16
资源大小：34191k
文件大小：4k
源码类别：

游戏引擎

开发平台：

Visual C++

Grass.cpp：源码内容
  1. // Grass.cpp: implementation of the CGrass class.
  2. //
  3. //////////////////////////////////////////////////////////////////////
  5. #include "stdafx.h"
  6. #include "Grass.h"
  7. #include "Texmanager.h"
  8. #include "math.h"
  9. //////////////////////////////////////////////////////////////////////
  10. // Construction/Destruction
  11. //////////////////////////////////////////////////////////////////////
  13. CGrass::CGrass()
  14. {
  15. m_size=8.0f;
  16.     m_height=m_size*0.8f;
  17. }
  19. CGrass::~CGrass()
  20. {
  22. }
  23. bool CGrass::InitGrass(int type)
  24. {
  25.  m_type=type;
  26.  CTexManager cTexManager;
  27.  //////////////read blend skin texture
  28.  if(type==1)
  29.  texGrass=cTexManager.GetTextureID(TEX_GRASS_0);
  30.  else
  31.  texGrass=cTexManager.GetTextureID(TEX_GRASS_1);
  33.      return true;
  34. }
  35. void CGrass::RenderGrass(VERTEX pos)
  36. {
  37.     glPushMatrix();
  38. glTranslatef(pos.xpos,pos.ypos,pos.zpos);
  40.     glAlphaFunc(GL_GREATER,0.10f);
  41. glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
  42. glEnable(GL_BLEND);
  43.     glEnable(GL_ALPHA_TEST);
  44. glDisable(GL_CULL_FACE);
  45. ////////////////////////////////////
  46. if(m_type==1)
  47.         DrawGrassStrip();
  48. else
  49. DrawGrassStar();
  50.    ///////////////////////////////////////////
  51.     glDisable(GL_ALPHA_TEST);
  52. glDisable(GL_BLEND); 
  54.     glPopMatrix();
  55. }
  56. void CGrass::DrawGrassStrip()
  57. {
  58.     //////////////////////////////////////////
  60.   glBindTexture(GL_TEXTURE_2D, texGrass);
  61. glEnable(GL_TEXTURE_2D);
  62.     ///////////////////////////////////////////
  63. glBegin(GL_QUAD_STRIP);
  65.     glTexCoord2f(1,0);
  66.     glVertex3f(m_size*0.3f,0,-m_size*0.5f);
  67.     glTexCoord2f(1,1);
  68.     glVertex3f(m_size*0.3f,m_height*1.4f,-m_size*0.5f);
  70.     glTexCoord2f(0,0);
  71.     glVertex3f(0,0,0);
  72.     glTexCoord2f(0,1);
  73.     glVertex3f(0,m_height*1.5f,0);
  75.     glTexCoord2f(1,0);
  76.     glVertex3f(m_size,0,0);
  77.     glTexCoord2f(1,1);
  78.     glVertex3f(m_size,m_height*1.5f,0);
  80.     glTexCoord2f(0,0);
  81.     glVertex3f(m_size*1.1f,0,-m_size*0.4f);
  82.     glTexCoord2f(0,1);
  83.     glVertex3f(m_size*1.1f,m_height*1.3f,-m_size*0.4f);
  85.     glTexCoord2f(1,0);
  86.     glVertex3f(m_size*0.2f,0,-m_size*1.2f);
  87.     glTexCoord2f(1,1);
  88.     glVertex3f(m_size*0.2f,m_height*1.3f,-m_size*1.2f);
  90.     glTexCoord2f(0,0);
  91.     glVertex3f(-m_size*0.3f,0,-m_size*0.6f);
  92.     glTexCoord2f(0,1);
  93.     glVertex3f(-m_size*0.3f,m_height*1.2f,-m_size*0.6f);
  94.     
  95.     glTexCoord2f(1,0);
  96.     glVertex3f(-m_size*0.2f,0,m_size*0.2f);
  97.     glTexCoord2f(1,1);
  98.     glVertex3f(-m_size*0.2f,m_height*1.2f,m_size*0.2f);
  100.     glTexCoord2f(0,0);
  101.     glVertex3f(m_size*0.9f,0,m_size*0.4f);
  102.     glTexCoord2f(0,1);
  103.     glVertex3f(m_size*0.9f,m_height*1.2f,m_size*0.4f);
  105.     glTexCoord2f(1,0);
  106.     glVertex3f(m_size*1.5f,0,-m_size*0.1f);
  107.     glTexCoord2f(1,1);
  108.     glVertex3f(m_size*1.5f,m_height*1.3f,-m_size*0.1f);
  110.     glTexCoord2f(0,0);
  111.     glVertex3f(m_size*1.2f,0,-m_size*1.0f);
  112.     glTexCoord2f(0,1);
  113.     glVertex3f(m_size*1.2f,m_height*1.1f,-m_size*1.0f);
  115.     glTexCoord2f(1,0);
  116.     glVertex3f(m_size*0.1f,0,-m_size*1.1f);
  117.     glTexCoord2f(1,1);
  118.     glVertex3f(m_size*0.1f,m_height*1.4f,-m_size*1.1f);
  120. glEnd();
  122. }
  123. void CGrass::DrawGrassStar()
  124. {
  125.   glBindTexture(GL_TEXTURE_2D, texGrass);
  126. DrawCross(60);
  127. }
  128. void CGrass::DrawCross(int angle)
  129. {
  130. int num=180/angle;
  132. glBegin(GL_QUADS);
  133. int curAngle=0;
  134. for(int i=0;i<num;i++)
  135. {
  136. curAngle=angle*i;
  138.     glTexCoord2f(0,0);
  139.     glVertex3f(m_size*cosf(0.0174533f*curAngle),0,m_size*sinf(0.0174533f*curAngle));    
  141. glTexCoord2f(1,0);
  142.     glVertex3f(m_size*cosf(0.0174533f*(curAngle+180)),0,m_size*sinf(0.0174533f*(curAngle+180)));    
  144.        glTexCoord2f(1,1);
  145.     glVertex3f(m_size*cosf(0.0174533f*(curAngle+180)),m_height,m_size*sinf(0.0174533f*(curAngle+180)));    
  147. glTexCoord2f(0,1);
  148.     glVertex3f(m_size*cosf(0.0174533f*curAngle),m_height,m_size*sinf(0.0174533f*curAngle));    
  149. }
  150.     glEnd();
  151. }