mlrcardcloud.cpp

机甲指挥官2源代码

						//
						//-------------------------------------------------------
						// 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((*clipPerVertex)[k1] == 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 if((*clipPerVertex)[k1] != 0)
					{
						Verify((*clipPerVertex)[k1] == (*clipPerVertex)[k]);
						continue;
					}

					//
					//--------------------------------------------------
					// We now find the distance along the edge where the
					// clipping plane will intersect
					//--------------------------------------------------
					//
					mask = 1;
					theTest |= (*clipPerVertex)[k1];

					//
					//-----------------------------------------------------
					// Find the boundary conditions that match our clipping
					// plane
					//-----------------------------------------------------
					//
					for (l=0; l<MLRClippingState::NextBit; l++)
					{
						if(theTest.IsClipped(mask))
						{
							//
							//-------------------------------------------
							// Find the clipping interval from bc0 to bc1
							//-------------------------------------------
							//
							a = GetLerpFactor(l, (*transformedCoords)[k], (*transformedCoords)[k1]);

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

							ct = l;

							break;
						}
						mask <<= 1;
					}

					//
					//------------------------------
					// Lerp the homogeneous position
					//------------------------------
					//
					(*clipExtraCoords)[clipped_index].Lerp(
						(*transformedCoords)[k],
						(*transformedCoords)[k1],
						a
					);

					DoClipTrick((*clipExtraCoords)[clipped_index], ct);

					//
					//----------------------------------------------------------
					// If there are colors, lerp them in screen space for now as
					// most cards do that anyway
					//----------------------------------------------------------
					//
					(*clipExtraTexCoords)[clipped_index].Lerp(
						texCoords[k],
						texCoords[k1],
						a
					);

					(*clipExtraColors)[clipped_index] = colors[i];

					//
					//--------------------------------
					// Bump the polygon's vertex count
					//--------------------------------
					//
					numberVerticesPerPolygon++;
				}
			}

			//
			//---------------------------------------------------------------
			// We have to handle multiple planes.  We do this by creating two
			// buffers and we switch between them as we clip plane by plane
			//---------------------------------------------------------------
			//
			else
			{
				EffectClipData srcPolygon, dstPolygon;
				int dstBuffer = 0;

				//
				//-----------------------------------------------------
				// Point the source polygon buffer at our original data
				//-----------------------------------------------------
				//
				srcPolygon.coords = &((*transformedCoords)[j]);
				srcPolygon.clipPerVertex = &((*clipPerVertex)[j]);							
				srcPolygon.flags = 0;


//				srcPolygon.colors = const_cast<RGBAColor*>(&colors[j]);

				srcPolygon.flags |= 2;

				srcPolygon.texCoords = const_cast<Vector2DScalar*>(&texCoords[j]);

				srcPolygon.length = 4;

				//
				//--------------------------------
				// Point to the destination buffer
				//--------------------------------
				//
				dstPolygon.coords = clipBuffer[dstBuffer].coords.GetData();
//				dstPolygon.colors = clipBuffer[dstBuffer].colors.GetData();
				dstPolygon.texCoords = clipBuffer[dstBuffer].texCoords.GetData();
				dstPolygon.clipPerVertex = clipBuffer[dstBuffer].clipPerVertex.GetData();
				dstPolygon.flags = srcPolygon.flags;
				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;

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

							//
							//-----------------------------------
							// Clip each vertex against the plane
							//-----------------------------------
							//
							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)
								{
									dstPolygon.coords[dstPolygon.length] = 
										srcPolygon.coords[k];

									dstPolygon.clipPerVertex[dstPolygon.length] = 
										srcPolygon.clipPerVertex[k];

									dstPolygon.texCoords[dstPolygon.length] = 
										srcPolygon.texCoords[k];

									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 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
								//-------------------------------------------
								//
								bc0 = GetBC(l, srcPolygon.coords[k]);
								bc1 = GetBC(l, srcPolygon.coords[k1]);
								Verify(!Close_Enough(bc0, bc1));
								a = bc0 / (bc0 - bc1);
								Verify(a >= 0.0f && a <= 1.0f);

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

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

								//
								//-----------------------------------------------------
								// If there are texture uv's, we need to lerp them in a
								// perspective correct manner
								//-----------------------------------------------------
								//
								dstPolygon.texCoords[dstPolygon.length].Lerp
									(
										srcPolygon.texCoords[k],
										srcPolygon.texCoords[k1],
										a
									);

								//
								//-------------------------------------
								// 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();
	//						srcPolygon.colors = clipBuffer[dstBuffer].colors.GetData();
							srcPolygon.texCoords = clipBuffer[dstBuffer].texCoords.GetData();
							srcPolygon.clipPerVertex = clipBuffer[dstBuffer].clipPerVertex.GetData();	
							srcPolygon.length = dstPolygon.length;

							dstBuffer = !dstBuffer;

							dstPolygon.coords = clipBuffer[dstBuffer].coords.GetData();
	//						dstPolygon.colors = clipBuffer[dstBuffer].colors.GetData();
							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];
					}

					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
				//--------------------------------------------------
				//
				for(k=0;k<srcPolygon.length;k++)
				{
					int clipped_index = myNumberUsedClipVertex + k;

					if(srcPolygon.coords[k].z == srcPolygon.coords[k].w)
					{
						srcPolygon.coords[k].z -= SMALL;
					}
					(*clipExtraCoords)[clipped_index] = srcPolygon.coords[k];

					(*clipExtraTexCoords)[clipped_index] = srcPolygon.texCoords[k];

					(*clipExtraColors)[clipped_index] = colors[i];
				}

				numberVerticesPerPolygon = srcPolygon.length;
			}

			(*clipExtraLength)[myNumberUsedClipLength] = numberVerticesPerPolygon;
			myNumberUsedClipVertex += numberVerticesPerPolygon;
			myNumberUsedClipLength++;
			ret++;

//					clip

//					dont draw the original
			TurnInVisible(i);
		}
	}

	if(myNumberUsedClipLength > 0)
	{
		for(i=0,j=0;i<myNumberUsedClipLength;i++)
		{
			int stride = (*clipExtraLength)[i];

			for(k=1;k<stride-1;k++)
			{
				Verify((vt->GetLast() + 3 + numGOSVertices) < vt->GetLength());

				GOSCopyTriangleData(
					&gos_vertices[numGOSVertices],
					clipExtraCoords->GetData(),
					clipExtraColors->GetData(),
					clipExtraTexCoords->GetData(),
					j, j+k+1, j+k,
					true
				);
#ifdef LAB_ONLY
				if(gShowClippedPolys)
				{
					gos_vertices[numGOSVertices].argb = 0xffff0000;
					gos_vertices[numGOSVertices].u = 0.0f;
					gos_vertices[numGOSVertices].v = 0.0f;

					gos_vertices[numGOSVertices+1].argb = 0xffff0000;
					gos_vertices[numGOSVertices+1].u = 0.0f;
					gos_vertices[numGOSVertices+1].v = 0.0f;

					gos_vertices[numGOSVertices+2].argb = 0xffff0000;
					gos_vertices[numGOSVertices+2].u = 0.0f;
					gos_vertices[numGOSVertices+2].v = 0.0f;
				}
#endif
				numGOSVertices += 3;
			}
			j += stride;
		}
	}
	vt->Increase(numGOSVertices);

	visible = numGOSVertices ? 1 : 0;

	if(visible)
	{
	}
	else
	{
	}

	return visible;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
void 
	MLRCardCloud::TestInstance() const
{
	if (usedNrOfCards)
	{
		Check_Pointer(usedNrOfCards);
		Verify(*usedNrOfCards >= 0);
		Verify(*usedNrOfCards <= maxNrOf);
	}
}