mirror of
https://github.com/ClassiCube/ClassiCube.git
synced 2025-11-04 03:27:49 -05:00
320 lines
9.9 KiB
C#
320 lines
9.9 KiB
C#
//#define DEBUG_OCCLUSION
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using System;
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using ClassicalSharp.GraphicsAPI;
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namespace ClassicalSharp {
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public partial class ChunkMeshBuilder {
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int X, Y, Z;
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byte tile;
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BlockInfo info;
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Map map;
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Game game;
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IGraphicsApi graphics;
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const int chunkSize = 16, extChunkSize = 18;
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const int chunkSize2 = 16 * 16, extChunkSize2 = 18 * 18;
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const int chunkSize3 = 16 * 16 * 16, extChunkSize3 = 18 * 18 * 18;
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public ChunkMeshBuilder( Game game ) {
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this.game = game;
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graphics = game.Graphics;
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info = game.BlockInfo;
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game.Events.TerrainAtlasChanged += TerrainAtlasChanged;
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}
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internal int width, length, height, clipLevel;
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int maxX, maxY, maxZ;
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byte[] counts = new byte[chunkSize3 * TileSide.Sides];
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byte[] chunk = new byte[extChunkSize3];
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bool BuildChunk( int x1, int y1, int z1 ) {
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PreStretchTiles( x1, y1, z1 );
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if( ReadChunkData( x1, y1, z1 ) ) return false;
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Stretch( x1, y1, z1 );
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PostStretchTiles( x1, y1, z1 );
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int xMax = Math.Min( width, x1 + chunkSize );
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int yMax = Math.Min( height, y1 + chunkSize );
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int zMax = Math.Min( length, z1 + chunkSize );
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for( int y = y1, yy = 0; y < yMax; y++, yy++ ) {
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for( int z = z1, zz = 0; z < zMax; z++, zz++ ) {
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int chunkIndex = ( yy + 1 ) * extChunkSize2 + ( zz + 1 ) * extChunkSize + ( 0 + 1 ) - 1;
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for( int x = x1, xx = 0; x < xMax; x++, xx++ ) {
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chunkIndex++;
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tile = chunk[chunkIndex];
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if( tile != 0 ) {
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RenderTile( chunkIndex, xx, yy, zz, x, y, z );
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}
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}
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}
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}
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return true;
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}
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unsafe bool ReadChunkData( int x1, int y1, int z1 ) {
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bool allAir = true, allSolid = true;
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fixed( byte* chunkPtr = chunk, mapPtr = map.mapData ) {
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int* chunkIntPtr = (int*)chunkPtr;
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for( int i = 0; i < extChunkSize3 / sizeof( int ); i++ ) {
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*chunkIntPtr++ = 0;
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}
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for( int yy = -1; yy < 17; yy++ ) {
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int y = yy + y1;
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if( y < 0 ) continue;
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if( y > maxY ) break;
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for( int zz = -1; zz < 17; zz++ ) {
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int z = zz + z1;
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if( z < 0 ) continue;
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if( z > maxZ ) break;
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int index = ( y * length + z ) * width + ( x1 - 1 - 1 );
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int chunkIndex = ( yy + 1 ) * extChunkSize2 + ( zz + 1 ) * extChunkSize + ( -1 + 1 ) - 1;
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for( int xx = -1; xx < 17; xx++ ) {
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int x = xx + x1;
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index++;
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chunkIndex++;
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if( x < 0 ) continue;
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if( x > maxX ) break;
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byte block = mapPtr[index];
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if( block == 9 ) block = 8; // Still water --> Water
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if( block == 11 ) block = 10; // Still lava --> Lava
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if( allAir && block != 0 ) allAir = false;
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if( allSolid && !info.IsOpaque[block] ) allSolid = false;
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chunkPtr[chunkIndex] = block;
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}
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}
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}
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if( x1 == 0 || y1 == 0 || z1 == 0 || x1 + chunkSize >= width ||
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y1 + chunkSize >= height || z1 + chunkSize >= length ) allSolid = false;
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if( !( allAir || allSolid ) ) {
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map.HeightmapHint( x1 - 1, z1 - 1, mapPtr );
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}
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}
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return allAir || allSolid;
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}
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public void GetDrawInfo( int x, int y, int z, ref ChunkPartInfo[] normalParts,
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ref ChunkPartInfo[] translucentParts, ref byte occlusionFlags ) {
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if( !BuildChunk( x, y, z ) )
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return;
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for( int i = 0; i < arraysCount; i++ ) {
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SetPartInfo( drawInfoNormal[i], i, ref normalParts );
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SetPartInfo( drawInfoTranslucent[i], i, ref translucentParts );
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}
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if( normalParts != null || translucentParts != null )
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occlusionFlags = 0;//(byte)ComputeOcclusion();
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}
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public void RenderTile( int chunkIndex, int xx, int yy, int zz, int x, int y, int z ) {
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X = x; Y = y; Z = z;
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int index = ( ( yy << 8 ) + ( zz << 4 ) + xx ) * TileSide.Sides;
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if( info.IsSprite[tile] ) {
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fullBright = info.FullBright[tile];
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int count = counts[index + TileSide.Top];
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if( count != 0 ) {
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blockHeight = info.Height[tile];
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DrawSprite( count );
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}
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return;
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}
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int leftCount = counts[index++], rightCount = counts[index++],
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frontCount = counts[index++], backCount = counts[index++],
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bottomCount = counts[index++], topCount = counts[index++];
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if( leftCount == 0 && rightCount == 0 && frontCount == 0 &&
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backCount == 0 && bottomCount == 0 && topCount == 0 ) return;
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fullBright = info.FullBright[tile];
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blockHeight = info.Height[tile];
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isTranslucent = info.IsTranslucent[tile];
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if( leftCount != 0 )
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DrawLeftFace( leftCount );
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if( rightCount != 0 )
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DrawRightFace( rightCount );
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if( frontCount != 0 )
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DrawFrontFace( frontCount );
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if( backCount != 0 )
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DrawBackFace( backCount );
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if( bottomCount != 0 )
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DrawBottomFace( bottomCount );
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if( topCount != 0 )
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DrawTopFace( topCount );
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}
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void Stretch( int x1, int y1, int z1 ) {
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for( int i = 0; i < counts.Length; i++ ) {
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counts[i] = 1;
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}
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int xMax = Math.Min( width, x1 + chunkSize );
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int yMax = Math.Min( height, y1 + chunkSize );
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int zMax = Math.Min( length, z1 + chunkSize );
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#if DEBUG_OCCLUSION
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int flags = ComputeOcclusion();
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FastColour col = new FastColour( 60, 60, 60, 255 );
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if( (flags & 1) != 0 ) col.R = 255; // x
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if( (flags & 4) != 0 ) col.G = 255; // y
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if( (flags & 2) != 0 ) col.B = 255; // z
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map.Sunlight = map.Shadowlight = col;
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map.SunlightXSide = map.ShadowlightXSide = col;
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map.SunlightZSide = map.ShadowlightZSide = col;
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map.SunlightYBottom = map.ShadowlightYBottom = col;
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#endif
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for( int y = y1, yy = 0; y < yMax; y++, yy++ ) {
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for( int z = z1, zz = 0; z < zMax; z++, zz++ ) {
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int chunkIndex = (yy + 1) * extChunkSize2 + (zz + 1) * extChunkSize + (-1 + 1);
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for( int x = x1, xx = 0; x < xMax; x++, xx++ ) {
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chunkIndex++;
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byte tile = chunk[chunkIndex];
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if( tile == 0 ) continue;
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int countIndex = ((yy << 8) + (zz << 4) + xx) * TileSide.Sides;
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// Sprites only use one face to indicate stretching count, so we can take a shortcut here.
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// Note that sprites are not drawn with any of the DrawXFace, they are drawn using DrawSprite.
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if( info.IsSprite[tile] ) {
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countIndex += TileSide.Top;
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if( counts[countIndex] != 0 ) {
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X = x; Y = y; Z = z;
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AddSpriteVertices( tile, 1 );
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counts[countIndex] = 1;
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}
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} else {
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X = x; Y = y; Z = z;
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fullBright = info.FullBright[tile];
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TestAndStretchZ( zz, countIndex, tile, chunkIndex, x, 0, TileSide.Left, -1 );
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TestAndStretchZ( zz, countIndex, tile, chunkIndex, x, maxX, TileSide.Right, 1 );
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TestAndStretchX( xx, countIndex, tile, chunkIndex, z, 0, TileSide.Front, -extChunkSize );
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TestAndStretchX( xx, countIndex, tile, chunkIndex, z, maxZ, TileSide.Back, extChunkSize );
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if( y > 0 )
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TestAndStretchX( xx, countIndex, tile, chunkIndex, y, 0, TileSide.Bottom, -extChunkSize2 );
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else
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counts[countIndex + TileSide.Bottom] = 0;
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TestAndStretchX( xx, countIndex, tile, chunkIndex, y, maxY + 2, TileSide.Top, extChunkSize2 );
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}
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}
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}
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}
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}
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void TestAndStretchX( int xx, int index, byte tile, int chunkIndex, int value, int test, int tileSide, int offset ) {
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index += tileSide;
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if( counts[index] != 0 ) {
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if( (value == test && Y < clipLevel) ||
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(value != test && info.IsFaceHidden( tile, chunk[chunkIndex + offset], tileSide )) ) {
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counts[index] = 0;
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} else {
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int count = StretchX( xx, index, X, Y, Z, chunkIndex, tile, tileSide );
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AddVertices( tile, count, tileSide );
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counts[index] = (byte)count;
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}
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}
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}
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void TestAndStretchZ( int zz, int index, byte tile, int chunkIndex, int value, int test, int tileSide, int offset ) {
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index += tileSide;
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if( counts[index] != 0 ) {
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if( (value == test && Y < clipLevel) ||
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(value != test && info.IsFaceHidden( tile, chunk[chunkIndex + offset], tileSide )) ) {
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counts[index] = 0;
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} else {
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int count = StretchZ( zz, index, X, Y, Z, chunkIndex, tile, tileSide );
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AddVertices( tile, count, tileSide );
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counts[index] = (byte)count;
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}
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}
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}
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byte GetNeighbour( int chunkIndex, int face ) {
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switch( face ) {
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case TileSide.Left:
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return chunk[chunkIndex - 1]; // x - 1
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case TileSide.Right:
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return chunk[chunkIndex + 1]; // x + 1
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case TileSide.Front:
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return chunk[chunkIndex - 18]; // z - 1
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case TileSide.Back:
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return chunk[chunkIndex + 18]; // z + 1
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case TileSide.Bottom:
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return chunk[chunkIndex - 324]; // y - 1
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case TileSide.Top:
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return chunk[chunkIndex + 324]; // y + 1
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}
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return 0;
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}
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int StretchX( int xx, int countIndex, int x, int y, int z, int chunkIndex, byte tile, int face ) {
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int count = 1;
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x++;
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chunkIndex++;
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countIndex += TileSide.Sides;
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int max = chunkSize - xx;
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while( count < max && x < width && CanStretch( tile, chunkIndex, x, y, z, face ) ) {
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counts[countIndex] = 0;
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count++;
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x++;
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chunkIndex++;
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countIndex += TileSide.Sides;
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}
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return count;
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}
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int StretchZ( int zz, int countIndex, int x, int y, int z, int chunkIndex, byte tile, int face ) {
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int count = 1;
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z++;
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chunkIndex += extChunkSize;
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countIndex += chunkSize * TileSide.Sides;
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int max = chunkSize - zz;
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while( count < max && z < length && CanStretch( tile, chunkIndex, x, y, z, face ) ) {
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counts[countIndex] = 0;
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count++;
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z++;
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chunkIndex += extChunkSize;
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countIndex += chunkSize * TileSide.Sides;
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}
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return count;
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}
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public void OnNewMap() {
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}
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public void OnNewMapLoaded() {
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map = game.Map;
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width = map.Width;
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height = map.Height;
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length = map.Length;
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clipLevel = Math.Max( 0, game.Map.GroundHeight );
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maxX = width - 1;
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maxY = height - 1;
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maxZ = length - 1;
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}
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}
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public struct ChunkPartInfo {
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public int VbId, IndicesCount;
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public int leftIndex, rightIndex, frontIndex,
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backIndex, bottomIndex, topIndex;
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public ushort leftCount, rightCount, frontCount,
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backCount, bottomCount, topCount, spriteCount;
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}
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} |