OGRE GLRenderSystem

1. 视口
   • glViewport(x, y, w, h);
2. 清理
   • glClearColor(colour.r, colour.g, colour.b, colour.a);
   • glClearDepth(depth);
   • glEnable(GL_DEPTH_TEST);
   • glEnable(GL_SCISSOR_TEST);
   • glClear(flags);
   • glDisable(GL_SCISSOR_TEST);
3. 多边形模式
   • glPolygonMode(GL_FRONT_AND_BACK, glmode);
4. 投影矩阵
   • glMatrixMode(GL_PROJECTION); 
   • glLoadMatrixf(mat); 
   • glMatrixMode(GL_MODELVIEW);
5. 视图矩阵
   • glMatrixMode(GL_MODELVIEW); 
   • glLoadMatrixf(mat);
6. 材料
   • glDisable(GL_COLOR_MATERIAL);
   • glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, f4val);
   • glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, f4val);
   • glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, f4val);
   • glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, f4val);
   • glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, shininess);
7. 光照
   • glEnable(GL_LIGHTING);
     
   • glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
   • glLightf( gl_index, GL_SPOT_CUTOFF, 180.0 );
   • glLightfv(gl_index, GL_DIFFUSE, f4vals); 
   • glLightfv(gl_index, GL_SPECULAR, f4vals); 
   • glLightfv(gl_index, GL_AMBIENT, f4vals);
   • glLightfv(lightindex, GL_POSITION, vec.ptr());
   • glLightf(gl_index, GL_CONSTANT_ATTENUATION, lt->getAttenuationConstant());
   • glLightf(gl_index, GL_LINEAR_ATTENUATION, lt->getAttenuationLinear());
   • glLightf(gl_index, GL_QUADRATIC_ATTENUATION, lt->getAttenuationQuadric());
   • glEnable(gl_index);
8. 雾
   • glDisable(GL_FOG);
9. 混合
   • glDisable(GL_BLEND);
   • glBlendEquation(func);
10. 透明
    • glDisable(GL_ALPHA_TEST);
      
11. 点
    • glDisable(GL_VERTEX_PROGRAM_POINT_SIZE);
    • glDisable(GL_POINT_SPRITE);
12. 多边形
    • glDisable(GL_POLYGON_OFFSET_FILL); 
    • glDisable(GL_POLYGON_OFFSET_POINT);
    •  glDisable(GL_POLYGON_OFFSET_LINE);
13. 面剔除
    • glEnable( GL_CULL_FACE ); 
    • glCullFace( cullMode );
14. 渲染模式
    • glShadeModel(GL_SMOOTH);
15. 视图矩阵
    • glMatrixMode(GL_MODELVIEW); glLoadMatrixf(mat);
16. 法线
    • glDisable(GL_NORMALIZE);
17. 绑定顶点，法线，纹理
    • glBindBufferARB(GL_ARRAY_BUFFER_ARB, hwGlBuffer->getGLBufferId());
    • glVertexPointer();
    • glEnableClientState( GL_VERTEX_ARRAY );
    • glNormalPointer();
    • glEnableClientState( GL_NORMAL_ARRAY );
    • glClientActiveTextureARB(GL_TEXTURE0 + i);
    • glTexCoordPointer();
    • glEnableClientState( GL_TEXTURE_COORD_ARRAY );
18. 绑定索引，绘图
    • glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, getGLBufferId());
    • glDrawElements(primType, op.indexData->indexCount, indexType, pBufferData);