继续啊

int CScape::RenderPatch( int i ) { int FacesRendered = 0; static unsigned short Indices[INDICES_LOD_HIGH]; ScapePatch* Patch = &m_Patches[i]; unsigned short* IndexPtr; glVertexPointer( 3, GL_FLOAT, sizeof(ScapeVertex), m_Buffer->GetPointer() + (PATCH_VERTS * i * sizeof(ScapeVertex)) ); int CurIndices; //unsigned short* IndexPtr; if( Patch->LoD == SCAPE_LOD_HIGH ) { CurIndices = INDICES_LOD_HIGH; IndexPtr = m_Indices[0]; } else if( Patch->LoD == SCAPE_LOD_MED ) { CurIndices = INDICES_LOD_MED; IndexPtr = m_Indices[1]; } else if( Patch->LoD == SCAPE_LOD_LOW ) { CurIndices = INDICES_LOD_LOW; IndexPtr = m_Indices[2]; } else if( Patch->LoD == SCAPE_LOD_XTRALOW ) { CurIndices = INDICES_LOD_XTRALOW; IndexPtr = m_Indices[3]; } else if( Patch->LoD == SCAPE_LOD_MIN ) { CurIndices = INDICES_LOD_MIN; IndexPtr = m_Indices[4]; } memcpy( Indices, IndexPtr, CurIndices * sizeof(unsigned short) ); //GenIndices( Patch->LoD, Indices ); ScapePatch* Other; //ok, now to work out some adjacency LoD issues //If an adjacent patch is at a lower LoD, shift indices around //to avoid cracks in the landscape. if( i >= m_HeightPatches ) { Other = &m_Patches[i-m_HeightPatches]; if( Other->LoD > Patch->LoD ) { //the patch to the left is at a lower LoD //we need to reduce our left detail level for( int n = 0; n < CurIndices; ++n ) { if( (Indices[n] < (PATCH_SIZE+1)) && (Indices[n] % Other->LoD) != 0 ) { Indices[n] -= Indices[n] % Other->LoD; } } } } if( i <= m_NumPatches - m_HeightPatches ) { Other = &m_Patches[i+m_HeightPatches]; if( Other->LoD > Patch->LoD ) { //Patch to the right is at a lower LoD //reduce right edge detail for( int n = 0; n < CurIndices; ++n ) { if( (Indices[n] > ((PATCH_SIZE+1)*PATCH_SIZE) ) && (Indices[n] % Other->LoD) != 0 ) { Indices[n] -= Indices[n] % Other->LoD; } } } } if( i % m_HeightPatches ) { Other = &m_Patches[i-1]; if( Other->LoD > Patch->LoD ) { //the patch to the top is at a lower LoD //we need to reduce our top detail level for( int n = 0; n < CurIndices; ++n ) { if( (Indices[n] % (PATCH_SIZE+1) == 0) && (Indices[n] % (Other->LoD * (PATCH_SIZE+1))) != 0) { Indices[n] -= (PATCH_SIZE+1) * Indices[n] % (Other->LoD * (PATCH_SIZE+1)); } } } } if( (i + 1) % m_HeightPatches ) { Other = &m_Patches[i+1]; if( Other->LoD > Patch->LoD ) { //the patch to the bottom is at a lower LoD //we need to reduce our bottom detail level for( int n = 0; n < CurIndices; ++n ) { if( ((Indices[n] + 1) % (PATCH_SIZE+1) == 0) && (Indices[n] % (Other->LoD * (PATCH_SIZE+1))) != 0) { Indices[n] -= (PATCH_SIZE+1) * Indices[n] % (Other->LoD * (PATCH_SIZE+1)); } } } } glDrawElements( GL_TRIANGLES, CurIndices, GL_UNSIGNED_SHORT, Indices ); FacesRendered = CurIndices / 3; return FacesRendered; }