/** Draws a tile layer with a given camera. */
public static void draw(TileLayer layer, int gridTileWidth, int gridTileHeight, Camera camera = null)
{
int tileMinX, tileMinY, tileMaxX, tileMaxY;
if (camera != null)
{
tileMinX = (camera.mCornerX - layer.maxTileWidth) / layer.genericTileWidth;
tileMinY = (camera.mCornerY - layer.maxTileHeight) / layer.genericTileHeight;
tileMaxX = tileMinX + (targetWidth+ layer.maxTileWidth) / layer.genericTileWidth+2;
tileMaxY = tileMinY + (targetHeight+ layer.maxTileHeight) / layer.genericTileHeight+2;
}
else
{
tileMinX = 0;
tileMinY = 0;
tileMaxX = (targetWidth) / layer.genericTileWidth+1;
tileMaxY = (targetHeight) / layer.genericTileHeight+1;
}
int limX = Math.Min(layer.tileCountX, tileMaxX);
int limY = Math.Max(tileMinY, 0);
Util.Util.insertionSort<Sprite, Transformable>(layer.objects);
int objectIndex = 0;
for (int yid = Math.Min(layer.tileCountY, tileMaxY)-1; yid >= limY; --yid)
{
int y = yid * layer.genericTileHeight;
//Draw objects until they start going below the current layer
for (; objectIndex < layer.objects.Count; ++objectIndex)
{
if (layer.objects[objectIndex].rect.y < y)
break;
draw(layer.objects[objectIndex], camera);
}
for (int xid = Math.Max(tileMinX, 0); xid < limX; ++xid)
{
int tileId = layer.tiles[xid, yid];
if (tileId < 0)
continue;
Sprite tile = layer.tileCache[tileId];
int x = xid * layer.genericTileWidth;
//Bind tileset textures
tile.tileset.bind();
//Get screen coordinates of the tile in pixels
Util.Rect rect = tile.rect;
rect.x = x;
rect.y = y;
if (camera != null)
camera.worldToScreen(ref rect);
if (!Util.Maths.isRectVisible(rect, targetWidth, targetHeight))
continue;
//Set matrix uniforms
shaderIndexedBitmapSprite["orthoMatrix"].SetValue(
Util.Maths.matrixPixelProjection(rect, targetWidth, targetHeight));
shaderIndexedBitmapSprite["uvMatrix"].SetValue(tile.uvMatrix(tile.tileset.width, tile.tileset.height));
//Draw
LowLevelRenderer.draw();
}
}
//Draw all remaining objects
for (; objectIndex < layer.objects.Count; ++objectIndex)
draw(layer.objects[objectIndex], camera);
}
public static void draw(Sprite sprite, Camera camera = null)
{
if (!sprite.visible)
return;
//Bind tileset texture
sprite.tileset.bind();
Util.Rect rect = sprite.rect;
if (camera != null)
camera.worldToScreen(ref rect);
if (!Util.Maths.isRectVisible(rect, targetWidth, targetHeight))
return;
//Bind to GL_TEXTURE0 and GL_TEXTURE1
shaderIndexedBitmapSprite["indexTexture"].SetValue(0);
shaderIndexedBitmapSprite["paletteTexture"].SetValue(1);
shaderIndexedBitmapSprite["orthoMatrix"].SetValue(
Util.Maths.matrixPixelProjection(rect, targetWidth, targetHeight));
shaderIndexedBitmapSprite["uvMatrix"].SetValue(
sprite.uvMatrix(sprite.tileset.width, sprite.tileset.height));
//Draw
LowLevelRenderer.draw();
}