/// <summary>
/// binary insertion sort.
/// </summary>
/// <param name="billboard"></param>
/// <param name="viewMat"></param>
private void Insert(TextBillboardNode billboard, mat4 viewMat)
{
vec3 viewPosition = billboard.GetAbsoluteViewPosition(viewMat);
int left = 0, right = this.depthList.Count - 1;
while (left <= right)
{
int middle = (left + right) / 2;
float value = this.depthList[middle];
if (value < viewPosition.z)
{
left = middle + 1;
}
else if (value == viewPosition.z)
{
left = middle;
break;
}
else //(viewPosition.z < value)
{
right = middle - 1;
}
}
this.depthList.Insert(left, viewPosition.z);
this.billboardList.Insert(left, billboard);
}
/// <summary>
/// Creates a billboard in 3D world. Its size is described by Width\Height(in pixels).
/// </summary>
/// <param name="textureSource"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <returns></returns>
public static TextBillboardNode Create(ITextureSource textureSource, int width, int height)
{
var vs = new VertexShader(vertexCode);// this vertex shader has no vertex attributes.
var fs = new FragmentShader(fragmentCode);
var provider = new ShaderArray(vs, fs);
var map = new AttributeMap();
var builder = new RenderMethodBuilder(provider, map);
var node = new TextBillboardNode(textureSource, width, height, new TextBillboard(), builder);
node.Initialize();
return(node);
}
/// <summary>
/// Creates a billboard in 3D world. Its size is described by Width\Height(in pixels).
/// </summary>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="capacity">Maximum characters count.</param>
/// <param name="glyphServer"></param>
/// <returns></returns>
public static TextBillboardNode Create(int width, int height, int capacity, GlyphServer glyphServer = null)
{
var vs = new VertexShader(vertexCode);// this vertex shader has no vertex attributes.
var fs = new FragmentShader(fragmentCode);
var provider = new ShaderArray(vs, fs);
var map = new AttributeMap();
map.Add(inPosition, GlyphsModel.position);
map.Add(inSTR, GlyphsModel.STR);
var blendState = new BlendFuncSwitch(BlendSrcFactor.SrcAlpha, BlendDestFactor.OneMinusSrcAlpha);
var builder = new RenderMethodBuilder(provider, map, blendState);
var node = new TextBillboardNode(width, height, new GlyphsModel(capacity), builder, glyphServer);
node.Initialize();
node.blend = blendState;
return node;
}