private void CreateTextMesh()
{
if (_fontMap == null)
{
throw new ArgumentException("Can not create Text Mesh - FontMap not found!");
}
var verts = new List <float3>();
var uvs = new List <float2>();
var tris = new List <ushort>();
var normals = new List <float3>();
// build complete structure
// var charInfo = Font.CharInfo;
var atlasWidth = _fontMap.Image.Width;
var atlasHeight = _fontMap.Image.Height;
ushort vertex = 0;
var advanceX = 0f;
var advanceY = 0f;
var textMeshHeight = 0f;
// now build the mesh
foreach (var letter in _text)
{
GlyphOnMap glyphOnMap = _fontMap.GetGlyphOnMap(letter);
GlyphInfo glyphInfo = _fontMap.Font.GetGlyphInfo(letter);
var x = advanceX + glyphOnMap.BitmapL;
var y = advanceY - glyphOnMap.BitmapT;
var w = glyphOnMap.BitmapW;
var h = glyphOnMap.BitmapH;
if (-y > textMeshHeight)
{
textMeshHeight = -y;
}
advanceX += glyphInfo.AdvanceX;
advanceY += glyphInfo.AdvanceY;
// skip glyphs that have no pixels
if ((w <= M.EpsilonFloat) || (h <= M.EpsilonFloat))
{
continue;
}
var bitmapW = glyphOnMap.BitmapW;
var bitmapH = glyphOnMap.BitmapH;
var texOffsetX = glyphOnMap.TexOffX;
var texOffsetY = glyphOnMap.TexOffY;
// vertices
verts.Add(new float3(x, -y - h, 0));
verts.Add(new float3(x, -y, 0));
verts.Add(new float3(x + w, -y - h, 0));
verts.Add(new float3(x + w, -y, 0));
normals.Add(-float3.UnitZ);
normals.Add(-float3.UnitZ);
normals.Add(-float3.UnitZ);
normals.Add(-float3.UnitZ);
// uvs
uvs.Add(new float2(texOffsetX, texOffsetY + bitmapH / atlasHeight));
uvs.Add(new float2(texOffsetX, texOffsetY));
uvs.Add(new float2(texOffsetX + bitmapW / atlasWidth, texOffsetY + bitmapH / atlasHeight));
uvs.Add(new float2(texOffsetX + bitmapW / atlasWidth, texOffsetY));
// indices
tris.Add((ushort)(vertex + 1));
tris.Add(vertex);
tris.Add((ushort)(vertex + 2));
tris.Add((ushort)(vertex + 1));
tris.Add((ushort)(vertex + 2));
tris.Add((ushort)(vertex + 3));
vertex += 4;
}
Vertices = verts.ToArray();
Triangles = tris.ToArray();
UVs = uvs.ToArray();
Normals = normals.ToArray();
Vertices = _fontMap.FixTextKerning(Vertices, _text, 1);
var meshWidth = Vertices[Vertices.Length - 1].x - Vertices[0].x;
var translateToZero = Vertices[0].x;
for (var i = 0; i < Vertices.Length; i++)
{
var translateVert = new float3(Vertices[i].x - translateToZero - meshWidth / 2, Vertices[i].y - textMeshHeight / 2, Vertices[i].z);
var scaledVert = translateVert / meshWidth;
Vertices[i] = scaledVert;
}
}
protected void SetTextMesh(int posX, int posY)
{
if (FontMap == null)
{
return;
}
// relative coordinates from -1 to +1
var scaleX = (float)2 / RContext.ViewportWidth;
var scaleY = (float)2 / RContext.ViewportHeight;
var x = -1 + posX * scaleX;
var y = +1 - posY * scaleY;
// build complete structure
var vertices = new float3[4 * Text.Length];
var uvs = new float2[4 * Text.Length];
var indices = new ushort[6 * Text.Length];
// var charInfo = Font.CharInfo;
var atlasWidth = FontMap.Image.Width;
var atlasHeight = FontMap.Image.Height;
var index = 0;
ushort vertex = 0;
// now build the mesh
foreach (var letter in Text)
{
GlyphOnMap glyphOnMap = FontMap.GetGlyphOnMap(letter);
GlyphInfo glyphInfo = FontMap.Font.GetGlyphInfo(letter);
var x2 = x + glyphOnMap.BitmapL * scaleX;
var y2 = -y - glyphOnMap.BitmapT * scaleY;
var w = glyphOnMap.BitmapW * scaleX;
var h = glyphOnMap.BitmapH * scaleY;
x += glyphInfo.AdvanceX * scaleX;
y += glyphInfo.AdvanceY * scaleY;
// skip glyphs that have no pixels
if ((w <= M.EpsilonFloat) || (h <= M.EpsilonFloat))
{
continue;
}
var bitmapW = glyphOnMap.BitmapW;
var bitmapH = glyphOnMap.BitmapH;
var texOffsetX = glyphOnMap.TexOffX;
var texOffsetY = glyphOnMap.TexOffY;
// vertices
vertices[vertex] = new float3(x2, -y2 - h, 0);
vertices[vertex + 1] = new float3(x2, -y2, 0);
vertices[vertex + 2] = new float3(x2 + w, -y2 - h, 0);
vertices[vertex + 3] = new float3(x2 + w, -y2, 0);
// uvs
uvs[vertex] = new float2(texOffsetX, texOffsetY + bitmapH / atlasHeight);
uvs[vertex + 1] = new float2(texOffsetX, texOffsetY);
uvs[vertex + 2] = new float2(texOffsetX + bitmapW / atlasWidth, texOffsetY + bitmapH / atlasHeight);
uvs[vertex + 3] = new float2(texOffsetX + bitmapW / atlasWidth, texOffsetY);
// indices
indices[index++] = (ushort)(vertex + 1);
indices[index++] = vertex;
indices[index++] = (ushort)(vertex + 2);
indices[index++] = (ushort)(vertex + 1);
indices[index++] = (ushort)(vertex + 2);
indices[index++] = (ushort)(vertex + 3);
vertex += 4;
}
vertices = FontMap.FixTextKerning(vertices, Text, scaleX);
// create final mesh
CreateTextMesh(vertices, uvs, indices);
}
