/// <summary>
/// Create a <see cref="VertexArrayObject"/> for rendering glyphs.
/// </summary>
private void LinkSharedResources(GraphicsContext ctx)
{
CheckCurrentContext(ctx);
string resourceClassId = "OpenGL.Objects.FontPatch";
string resourceBaseId = String.Format("{0}.{1}-{2}-{3}", resourceClassId, Family, Size, Style);
string vertexArrayId = resourceBaseId + ".VertexArray";
string glyphDbId = resourceBaseId + ".GlyphDb";
#region Vertex Arrays
_VertexArrays = (VertexArrayObject)ctx.GetSharedResource(vertexArrayId);
Dictionary <char, Glyph> glyphsDb = null;
if (_VertexArrays == null)
{
_VertexArrays = new VertexArrayObject();
List <GlyphPolygons> glyphPolygons = GenerateGlyphs(Family, Size, Style);
List <Vertex2f> glyphsVertices = new List <Vertex2f>();
GlyphPolygons gGlyph = null;
uint gVertexIndex = 0;
glyphsDb = new Dictionary <char, Glyph>();
using (Tessellator tessellator = new Tessellator()) {
tessellator.Begin += delegate(object sender, TessellatorBeginEventArgs e) {
gVertexIndex = (uint)glyphsVertices.Count;
};
tessellator.End += delegate(object sender, EventArgs e) {
// Create element (range)
int glyphIndex = _VertexArrays.SetElementArray(PrimitiveType.Triangles, gVertexIndex, (uint)glyphsVertices.Count - gVertexIndex);
glyphsDb.Add(gGlyph.GlyphChar, new Glyph(gGlyph.GlyphChar, gGlyph.GlyphSize, glyphIndex));
};
tessellator.Vertex += delegate(object sender, TessellatorVertexEventArgs e) {
glyphsVertices.Add((Vertex2f)e.Vertex);
};
// Tessellate all glyphs
foreach (GlyphPolygons glyph in glyphPolygons)
{
gGlyph = glyph;
if (glyph.Contours.Count == 0)
{
glyphsDb.Add(gGlyph.GlyphChar, new Glyph(gGlyph.GlyphChar, gGlyph.GlyphSize, -1));
continue;
}
tessellator.BeginPolygon();
foreach (List <Vertex2f> countour in glyph.Contours)
{
tessellator.AddContour(countour.ToArray(), Vertex3f.UnitZ);
}
tessellator.EndPolygon();
}
}
// Element vertices
ArrayBufferObject <Vertex2f> gVertexPosition = new ArrayBufferObject <Vertex2f>(BufferObjectHint.StaticCpuDraw);
gVertexPosition.Create(glyphsVertices.ToArray());
_VertexArrays.SetArray(gVertexPosition, VertexArraySemantic.Position);
// Share
ctx.SetSharedResource(vertexArrayId, _VertexArrays);
}
LinkResource(_VertexArrays);
#endregion
#region Glyph Metadata
_Glyphs = (Dictionary <char, Glyph>)ctx.GetSharedResource(glyphDbId);
if (glyphsDb != null)
{
_Glyphs = glyphsDb;
}
if (_Glyphs == null)
{
throw new InvalidProgramException("no glyph metadata");
}
// Share
ctx.SetSharedResource(glyphDbId, _Glyphs);
#endregion
}
/// <summary>
/// Create a <see cref="VertexArrayObject"/> for rendering glyphs.
/// </summary>
/// <param name="fontFamily"></param>
/// <param name="emSize"></param>
/// <param name="glyphs"></param>
/// <returns></returns>
private static VertexArrayObject CreateVertexArray(GraphicsContext ctx, FontFamily fontFamily, uint emSize, FontStyle fontStyle, out Dictionary <char, Glyph> glyphs)
{
CheckCurrentContext(ctx);
string resourceBaseId = String.Format("OpenGL.Objects.FontPatch.{0}-{1}-{2}", fontFamily, emSize, fontStyle);
string vertexArrayId = resourceBaseId + ".VertexArray";
string glyphDbId = resourceBaseId + ".GlyphDb";
VertexArrayObject vertexArrays = (VertexArrayObject)ctx.GetSharedResource(vertexArrayId);
Dictionary <char, Glyph> glyphsDb = (Dictionary <char, Glyph>)ctx.GetSharedResource(glyphDbId);
if (vertexArrays != null && glyphsDb != null)
{
glyphs = glyphsDb;
return(vertexArrays);
}
vertexArrays = new VertexArrayObject();
glyphsDb = new Dictionary <char, Glyph>();
List <GlyphPolygons> glyphPolygons = GenerateGlyphs(fontFamily, emSize, fontStyle);
List <Vertex2f> glyphsVertices = new List <Vertex2f>();
GlyphPolygons gGlyph = null;
uint gVertexIndex = 0;
glyphs = new Dictionary <char, Glyph>();
using (Tessellator tessellator = new Tessellator()) {
tessellator.Begin += delegate(object sender, TessellatorBeginEventArgs e) {
gVertexIndex = (uint)glyphsVertices.Count;
};
tessellator.End += delegate(object sender, EventArgs e) {
// Create element (range)
int glyphIndex = vertexArrays.SetElementArray(PrimitiveType.Triangles, gVertexIndex, (uint)glyphsVertices.Count - gVertexIndex);
glyphsDb.Add(gGlyph.GlyphChar, new Glyph(gGlyph.GlyphChar, gGlyph.GlyphSize, glyphIndex));
};
tessellator.Vertex += delegate(object sender, TessellatorVertexEventArgs e) {
glyphsVertices.Add((Vertex2f)e.Vertex);
};
// Tessellate all glyphs
foreach (GlyphPolygons glyph in glyphPolygons)
{
gGlyph = glyph;
if (glyph.Contours.Count == 0)
{
glyphsDb.Add(gGlyph.GlyphChar, new Glyph(gGlyph.GlyphChar, gGlyph.GlyphSize, -1));
continue;
}
tessellator.BeginPolygon();
foreach (List <Vertex2f> countour in glyph.Contours)
{
tessellator.AddContour(countour.ToArray(), Vertex3f.UnitZ);
}
tessellator.EndPolygon();
}
}
// Element vertices
ArrayBufferObject <Vertex2f> gVertexPosition = new ArrayBufferObject <Vertex2f>(BufferObjectHint.StaticCpuDraw);
gVertexPosition.Create(glyphsVertices.ToArray());
vertexArrays.SetArray(gVertexPosition, VertexArraySemantic.Position);
// Returns glyphs database
glyphs = glyphsDb;
// Share resources
ctx.SetSharedResource(vertexArrayId, vertexArrays);
ctx.SetSharedResource(glyphDbId, glyphsDb);
return(vertexArrays);
}
