/*
* Minecraft Forge
* Copyright (c) 2016.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.minecraftforge.client.model;
import java.util.List;
import net.minecraft.client.renderer.vertex.VertexFormat;
import net.minecraft.client.renderer.vertex.VertexFormatElement;
import net.minecraft.client.renderer.vertex.VertexFormatElement.EnumType;
import net.minecraft.client.renderer.vertex.VertexFormatElement.EnumUsage;
public class Attributes
{
/*
* Default format of the data in IBakedModel
*/
public static final VertexFormat DEFAULT_BAKED_FORMAT;
static
{
DEFAULT_BAKED_FORMAT = new VertexFormat();
DEFAULT_BAKED_FORMAT.addElement(new VertexFormatElement(0, EnumType.FLOAT, EnumUsage.POSITION, 3));
DEFAULT_BAKED_FORMAT.addElement(new VertexFormatElement(0, EnumType.UBYTE, EnumUsage.COLOR, 4));
DEFAULT_BAKED_FORMAT.addElement(new VertexFormatElement(0, EnumType.FLOAT, EnumUsage.UV, 2));
DEFAULT_BAKED_FORMAT.addElement(new VertexFormatElement(0, EnumType.BYTE, EnumUsage.PADDING, 4));
}
/*
* Can first format be used where second is expected
*/
public static boolean moreSpecific(VertexFormat first, VertexFormat second)
{
int size = first.getNextOffset();
if(size != second.getNextOffset()) return false;
int padding = 0;
int j = 0;
for(VertexFormatElement firstAttr : first.getElements())
{
while(j < second.getElementCount() && second.getElement(j).getUsage() == EnumUsage.PADDING)
{
padding += second.getElement(j++).getSize();
}
if(j >= second.getElementCount() && padding == 0)
{
// if no padding is left, but there are still elements in first (we're processing one) - it doesn't fit
return false;
}
if(padding == 0)
{
// no padding - attributes have to match
VertexFormatElement secondAttr = second.getElement(j++);
if(
firstAttr.getIndex() != secondAttr.getIndex() ||
firstAttr.getElementCount() != secondAttr.getElementCount() ||
firstAttr.getType() != secondAttr.getType() ||
firstAttr.getUsage() != secondAttr.getUsage())
{
return false;
}
}
else
{
// padding - attribute should fit in it
padding -= firstAttr.getSize();
if(padding < 0) return false;
}
}
if(padding != 0 || j != second.getElementCount()) return false;
return true;
}
}