ForgeHooksClient.java 文件源码

public static void preDraw(EnumUsage attrType, VertexFormat format, int element, int stride, ByteBuffer buffer)
{
    VertexFormatElement attr = format.getElement(element);
    int count = attr.getElementCount();
    int constant = attr.getType().getGlConstant();
    buffer.position(format.getOffset(element));
    switch(attrType)
    {
        case POSITION:
            glVertexPointer(count, constant, stride, buffer);
            glEnableClientState(GL_VERTEX_ARRAY);
            break;
        case NORMAL:
            if(count != 3)
            {
                throw new IllegalArgumentException("Normal attribute should have the size 3: " + attr);
            }
            glNormalPointer(constant, stride, buffer);
            glEnableClientState(GL_NORMAL_ARRAY);
            break;
        case COLOR:
            glColorPointer(count, constant, stride, buffer);
            glEnableClientState(GL_COLOR_ARRAY);
            break;
        case UV:
            OpenGlHelper.setClientActiveTexture(OpenGlHelper.defaultTexUnit + attr.getIndex());
            glTexCoordPointer(count, constant, stride, buffer);
            glEnableClientState(GL_TEXTURE_COORD_ARRAY);
            OpenGlHelper.setClientActiveTexture(OpenGlHelper.defaultTexUnit);
            break;
        case PADDING:
            break;
        case GENERIC:
            glEnableVertexAttribArray(attr.getIndex());
            glVertexAttribPointer(attr.getIndex(), count, constant, false, stride, buffer);
        default:
            FMLLog.severe("Unimplemented vanilla attribute upload: %s", attrType.getDisplayName());
    }
}