mlrprimitiveclipping.hpp

机甲指挥官2源代码

					srcPolygon.clipPerVertex[l] = (*clipPerVertex)[indexK];
				}

				srcPolygon.length = l;

				//
				//--------------------------------
				// Point to the destination buffer
				//--------------------------------
				//
				dstBuffer = 0;

				dstPolygon.coords = clipBuffer[dstBuffer].coords.GetData();
#ifdef I_SAY_YES_TO_COLOR
				dstPolygon.colors = clipBuffer[dstBuffer].colors.GetData();
#endif
				dstPolygon.texCoords = clipBuffer[dstBuffer].texCoords.GetData();
				dstPolygon.clipPerVertex = clipBuffer[dstBuffer].clipPerVertex.GetData();
				dstPolygon.length = 0;

				//
				//-----------------------------------------------------------
				// Spin through each plane that clipped the primitive and use
				// it to actually clip the primitive
				//-----------------------------------------------------------
				//
				mask = 1;
				MLRClippingState theNewOr(0);
				int loop = 4;

#if HUNT_CLIP_ERROR
				for(k=0;k<srcPolygon.length;k++)
				{
					DEBUG_STREAM << setiosflags( ios::scientific) << setprecision(20) 
						<< srcPolygon.coords[k].x << " "
						<< srcPolygon.coords[k].y << " "
						<< srcPolygon.coords[k].z << " "
						<< srcPolygon.coords[k].w << '\n';
				}
#endif
#if HUNT_CLIP_ERROR
					DEBUG_STREAM << "TheOriginalOR: " << hex << theOr.GetClippingState() << dec << '\n';
#endif

				do
				{
					for(l=0; l<MLRClippingState::NextBit; l++)
					{
						if(theOr.IsClipped(mask))
						{

							//
							//-----------------------------------
							// Clip each vertex against the plane
							//-----------------------------------
							//
	#if HUNT_CLIP_ERROR
							DEBUG_STREAM << l << ": " << '\n';
	#endif
							for(k=0;k<srcPolygon.length;k++)
							{

								k1 = (k+1) < srcPolygon.length ? k+1 : 0;

								theTest = srcPolygon.clipPerVertex[k];

								//
								//----------------------------------------------------
								// If this vertex is inside the viewing space, copy it
								// directly to the clipping buffer
								//----------------------------------------------------
								//
								if(theTest.IsClipped(mask) == 0)
								{
									firstIsIn = true;

									dstPolygon.coords[dstPolygon.length] = 
										srcPolygon.coords[k];
	#if HUNT_CLIP_ERROR
									DEBUG_STREAM << k << " goes " << setiosflags( ios::scientific) << setprecision(20) 
										<< srcPolygon.coords[k].x << " "
										<< srcPolygon.coords[k].y << " "
										<< srcPolygon.coords[k].z << " "
										<< srcPolygon.coords[k].w << '\n';
	#endif


									dstPolygon.clipPerVertex[dstPolygon.length] = 
										srcPolygon.clipPerVertex[k];
	#ifdef I_SAY_YES_TO_COLOR
									dstPolygon.colors[dstPolygon.length] = 
										srcPolygon.colors[k];
	#endif

	#ifdef I_SAY_YES_TO_DUAL_TEXTURES
									dstPolygon.texCoords[2*dstPolygon.length] = 
										srcPolygon.texCoords[2*k];

									dstPolygon.texCoords[2*dstPolygon.length+1] = 
										srcPolygon.texCoords[2*k+1];
	#else
	#ifdef I_SAY_YES_TO_MULTI_TEXTURES
									for(m=0;m<currentNrOfPasses;m++)
									{
										dstPolygon.texCoords[currentNrOfPasses*dstPolygon.length+m] = 
											srcPolygon.texCoords[currentNrOfPasses*k+m];
									}
	#else
									dstPolygon.texCoords[dstPolygon.length] = 
										srcPolygon.texCoords[k];
	#endif
	#endif
									dstPolygon.length++;

									//
									//-------------------------------------------------------
									// We don't need to clip this edge if the next vertex is
									// also in the viewing space, so just move on to the next
									// vertex
									//-------------------------------------------------------
									//
									if(srcPolygon.clipPerVertex[k1].IsClipped(mask) == 0)
									{
										continue;
									}
								}

								//
								//---------------------------------------------------------
								// This vertex is outside the viewing space, so if the next
								// vertex is also outside the viewing space, no clipping is
								// needed and we throw this vertex away.  Since only one
								// clipping plane is involved, it must be in the same space
								// as the first vertex
								//---------------------------------------------------------
								//
								else 
								{
									firstIsIn = false;

									if(srcPolygon.clipPerVertex[k1].IsClipped(mask) != 0)
									{
										Verify(
											srcPolygon.clipPerVertex[k1].IsClipped(mask)
											== srcPolygon.clipPerVertex[k].IsClipped(mask)
										);
										continue;
									}
								}

								//
								//-------------------------------------------
								// Find the clipping interval from bc0 to bc1
								//-------------------------------------------
								//
								if(firstIsIn == true)
								{
									a = GetLerpFactor (l, srcPolygon.coords[k], srcPolygon.coords[k1]);

									Verify(a >= 0.0f && a <= 1.0f);

									//
									//------------------------------
									// Lerp the homogeneous position
									//------------------------------
									//
									dstPolygon.coords[dstPolygon.length].Lerp(
										srcPolygon.coords[k],
										srcPolygon.coords[k1],
										a
									);

	#if HUNT_CLIP_ERROR
									DEBUG_STREAM << "True " << a << " " << k << " " << k1 << " we get " << dstPolygon.length << '\n';
									DEBUG_STREAM << setiosflags( ios::scientific) << setprecision(20) 
										<< dstPolygon.coords[dstPolygon.length].x << " "
										<< dstPolygon.coords[dstPolygon.length].y << " "
										<< dstPolygon.coords[dstPolygon.length].z << " "
										<< dstPolygon.coords[dstPolygon.length].w << '\n';
	#endif
									DoClipTrick(dstPolygon.coords[dstPolygon.length], l);


									//
									//----------------------------------------------------------
									// If there are colors, lerp them in screen space for now as
									// most cards do that anyway
									//----------------------------------------------------------
									//
	#ifdef I_SAY_YES_TO_COLOR
			#if COLOR_AS_DWORD
									dstPolygon.colors[dstPolygon.length] = Color_DWORD_Lerp(
										srcPolygon.colors[k],
										srcPolygon.colors[k1],
										a
									);
		#else
									dstPolygon.colors[dstPolygon.length].Lerp(
										srcPolygon.colors[k],
										srcPolygon.colors[k1],
										a
									);
		#endif
	#endif
									//
									//-----------------------------------------------------
									// If there are texture uv's, we need to lerp them in a
									// perspective correct manner
									//-----------------------------------------------------
									//
	#ifdef I_SAY_YES_TO_DUAL_TEXTURES
									dstPolygon.texCoords[2*dstPolygon.length].Lerp
										(
											srcPolygon.texCoords[2*k],
											srcPolygon.texCoords[2*k1],
											a
										);

									dstPolygon.texCoords[2*dstPolygon.length+1].Lerp
										(
											srcPolygon.texCoords[2*k+1],
											srcPolygon.texCoords[2*k1+1],
											a
										);
	#else
	#ifdef I_SAY_YES_TO_MULTI_TEXTURES
									for(m=0;m<currentNrOfPasses;m++)
									{
										dstPolygon.texCoords[currentNrOfPasses*dstPolygon.length+m].Lerp
											(
												srcPolygon.texCoords[currentNrOfPasses*k+m],
												srcPolygon.texCoords[currentNrOfPasses*k1+m],
												a
											);
									}
	#else
									dstPolygon.texCoords[dstPolygon.length].Lerp
										(
											srcPolygon.texCoords[k],
											srcPolygon.texCoords[k1],
											a
										);
	#endif
	#endif
								}
								else
								{
									a = GetLerpFactor (l, srcPolygon.coords[k1], srcPolygon.coords[k]);
									Verify(a >= 0.0f && a <= 1.0f);

								//
								//------------------------------
								// Lerp the homogeneous position
								//------------------------------
								//
								dstPolygon.coords[dstPolygon.length].Lerp(
									srcPolygon.coords[k1],
									srcPolygon.coords[k],
									a
								);

	#if HUNT_CLIP_ERROR
									DEBUG_STREAM << "False " << a << " " << k << " " << k1 << " we get " << dstPolygon.length << '\n';
									DEBUG_STREAM << setiosflags( ios::scientific) << setprecision(20) 
										<< dstPolygon.coords[dstPolygon.length].x << " "
										<< dstPolygon.coords[dstPolygon.length].y << " "
										<< dstPolygon.coords[dstPolygon.length].z << " "
										<< dstPolygon.coords[dstPolygon.length].w << '\n';
	#endif

								DoClipTrick(dstPolygon.coords[dstPolygon.length], l);


								//
								//----------------------------------------------------------
								// If there are colors, lerp them in screen space for now as
								// most cards do that anyway
								//----------------------------------------------------------
								//
	#ifdef I_SAY_YES_TO_COLOR
		#if COLOR_AS_DWORD
								dstPolygon.colors[dstPolygon.length] = Color_DWORD_Lerp(
									srcPolygon.colors[k1],
									srcPolygon.colors[k],
									a
								);
		#else
								dstPolygon.colors[dstPolygon.length].Lerp(
									srcPolygon.colors[k1],
									srcPolygon.colors[k],
									a
								);
		#endif
	#endif
								//
								//-----------------------------------------------------
								// If there are texture uv's, we need to lerp them in a
								// perspective correct manner
								//-----------------------------------------------------
								//
	#ifdef I_SAY_YES_TO_DUAL_TEXTURES
								dstPolygon.texCoords[2*dstPolygon.length].Lerp
									(
										srcPolygon.texCoords[2*k1],
										srcPolygon.texCoords[2*k],
										a
									);

								dstPolygon.texCoords[2*dstPolygon.length+1].Lerp
									(
										srcPolygon.texCoords[2*k1+1],
										srcPolygon.texCoords[2*k+1],
										a
									);
	#else
	#ifdef I_SAY_YES_TO_MULTI_TEXTURES
								for(m=0;m<currentNrOfPasses;m++)
								{
									dstPolygon.texCoords[currentNrOfPasses*dstPolygon.length+m].Lerp
										(
											srcPolygon.texCoords[currentNrOfPasses*k1+m],
											srcPolygon.texCoords[currentNrOfPasses*k+m],
											a
										);
								}
	#else
								dstPolygon.texCoords[dstPolygon.length].Lerp
									(
										srcPolygon.texCoords[k1],
										srcPolygon.texCoords[k],
										a
									);
	#endif
	#endif
								}

								//
								//-------------------------------------
								// We have to generate a new clip state
								//-------------------------------------
								//
								dstPolygon.clipPerVertex[dstPolygon.length].Clip4dVertex(&dstPolygon.coords[dstPolygon.length]);

								//
								//----------------------------------
								// Bump the new polygon vertex count
								//----------------------------------
								//
								dstPolygon.length++;
							}

							//
							//-----------------------------------------------
							// Swap source and destination buffer pointers in
							// preparation for the next plane test
							//-----------------------------------------------
							//
							srcPolygon.coords = clipBuffer[dstBuffer].coords.GetData();
	#ifdef I_SAY_YES_TO_COLOR
							srcPolygon.colors = clipBuffer[dstBuffer].colors.GetData();
	#endif
							srcPolygon.texCoords = clipBuffer[dstBuffer].texCoords.GetData();
							srcPolygon.clipPerVertex = clipBuffer[dstBuffer].clipPerVertex.GetData();	
							srcPolygon.length = dstPolygon.length;

							dstBuffer = !dstBuffer;

							dstPolygon.coords = clipBuffer[dstBuffer].coords.GetData();
	#ifdef I_SAY_YES_TO_COLOR
							dstPolygon.colors = clipBuffer[dstBuffer].colors.GetData();
	#endif
							dstPolygon.texCoords = clipBuffer[dstBuffer].texCoords.GetData();
							dstPolygon.clipPerVertex = clipBuffer[dstBuffer].clipPerVertex.GetData();
							dstPolygon.length = 0;

						}

						mask = mask << 1;
					}

					theNewOr = 0;
					for(k=0;k<srcPolygon.length;k++)
					{
						theNewOr |= srcPolygon.clipPerVertex[k];
					}
#if HUNT_CLIP_ERROR
					DEBUG_STREAM << "TheOR: " << hex << theNewOr.GetClippingState() << dec << '\n';
#endif
					theOr == theNewOr;
				} while (theNewOr != 0 && loop--);

				//
				//--------------------------------------------------
				// could not clip this rare case, just ignore it
				//--------------------------------------------------
				//
				if(theNewOr != 0)
				{
					testList[i] = 0;
					continue;
				}

				//
				//--------------------------------------------------
				// Move the most recent polygon into the clip buffer
				//--------------------------------------------------
				//
#if HUNT_CLIP_ERROR
				DEBUG_STREAM << "Final: " << srcPolygon.length << '\n';
#endif
				for(k=0;k<srcPolygon.length;k++)
				{
					int clipped_index = myNumberUsedClipVertex + k;
#if HUNT_CLIP_ERROR
					DEBUG_STREAM << setiosflags( ios::scientific) << setprecision(20) 
						<< srcPolygon.coords[k].x << " "
						<< srcPolygon.coords[k].y << " "
						<< srcPolygon.coords[k].z << " "
						<< srcPolygon.coords[k].w << '\n';
#endif

					(*clipExtraCoords)[clipped_index] = srcPolygon.coords[k];

#ifdef I_SAY_YES_TO_COLOR
					(*clipExtraColors)[clipped_index] = srcPolygon.colors[k];
#endif

#ifdef I_SAY_YES_TO_DUAL_TEXTURES
					(*clipExtraTexCoords)[clipped_index] = srcPolygon.texCoords[2*k];
					(*clipExtraTexCoords2)[clipped_index] = srcPolygon.texCoords[2*k+1];
#else