public static VertexArrays CreateCone(float radius, float height, uint dr)
{
VertexArrays vertexArray = new VertexArrays();
// Vertex generation
Vertex3f[] position = new Vertex3f[dr + 2];
int positionIndex = 0;
position[positionIndex++] = new Vertex3f(0.0f, 0.0f, -height);
double angleStep = Math.PI * 2.0 / dr;
for (double angle = 0.0f; angle <= Math.PI * 2.0; angle += angleStep)
{
float x = radius * (float)Math.Cos(angle);
float y = radius * (float)Math.Sin(angle);
Debug.Assert(positionIndex < position.Length);
position[positionIndex++] = new Vertex3f(x, y, 0.0f);
}
position[positionIndex++] = position[1];
// Buffer definition
ArrayBuffer <Vertex3f> positionBuffer = new ArrayBuffer <Vertex3f>();
positionBuffer.Create(position);
vertexArray.SetArray(positionBuffer, VertexArraySemantic.Position);
vertexArray.SetElementArray(PrimitiveType.TriangleFan);
return(vertexArray);
}
/// <summary>
/// Create a sphere.
/// </summary>
/// <param name="radius">
/// A <see cref="Single"/> that specifies the radius of the sphere.
/// </param>
/// <param name="slices">
/// A <see cref="Int32"/> that specifies the number of horizontal subdivisions of the sphere.
/// </param>
/// <param name="stacks">
/// A <see cref="Int32"/> that specifies the number of vertical subdivisions of the sphere.
/// </param>
/// <returns>
/// It returns a <see cref="Objects.VertexArrays"/> defining the following semantics:
/// - Positions
/// - Normals
/// </returns>
public static VertexArrays CreateSphere(float radius, int slices, int stacks)
{
VertexArrays vertexArray = new VertexArrays();
// Vertex generation
Vertex3f[] position, normal;
ushort[] indices;
int vertexCount;
GenerateSphere(radius, slices, stacks, out position, out normal, out indices, out vertexCount);
// Buffer definition
ArrayBuffer <Vertex3f> positionBuffer = new ArrayBuffer <Vertex3f>();
positionBuffer.Create(position);
vertexArray.SetArray(positionBuffer, VertexArraySemantic.Position);
ArrayBuffer <Vertex3f> normalBuffer = new ArrayBuffer <Vertex3f>();
normalBuffer.Create(normal);
vertexArray.SetArray(normalBuffer, VertexArraySemantic.Normal);
ElementBuffer <ushort> elementBuffer = new ElementBuffer <ushort>();
elementBuffer.Create(indices);
vertexArray.SetElementArray(PrimitiveType.TriangleStrip, elementBuffer);
return(vertexArray);
}
/// <summary>
///
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="dx"></param>
/// <param name="dy"></param>
/// <returns></returns>
public static VertexArrays CreatePlane(float x, float y, float z, uint dx, uint dy)
{
VertexArrays vertexArray = new VertexArrays();
// Vertex generation
Vertex3f[] position = new Vertex3f[(dx + 1) * (dy + 1)];
float x2 = x / 2.0f, y2 = y / 2.0f;
float vdx = x / dx, vdy = y / dy;
int vidx = 0;
for (float vy = -y2; vy <= y2; vy += vdy)
{
for (float vx = -x2; vx <= x2; vx += vdx)
{
Debug.Assert(vidx < position.Length);
position[vidx++] = new Vertex3f(vx, vy, z);
}
}
// Elements generation
List <uint> indices = new List <uint>();
uint restartIndex = ElementBuffer <uint> .DefaultRestartIndex;
uint vstride = dx + 1;
for (uint i = 0; i < dy; i++)
{
uint yoffset = i * vstride;
// Triangle strip start
indices.Add(yoffset + vstride);
for (uint ix = 0; ix < dx; ix++)
{
uint xoffset = yoffset + ix;
indices.Add(xoffset);
indices.Add(xoffset + vstride + 1);
}
indices.Add(yoffset + vstride - 1);
indices.Add(restartIndex);
}
// Buffer definition
ArrayBuffer <Vertex3f> positionBuffer = new ArrayBuffer <Vertex3f>();
positionBuffer.Create(position);
vertexArray.SetArray(positionBuffer, VertexArraySemantic.Position);
ElementBuffer <uint> elementBuffer = new ElementBuffer <uint>();
elementBuffer.Create(indices.ToArray());
elementBuffer.RestartIndexEnabled = true;
vertexArray.SetElementArray(PrimitiveType.TriangleStrip, elementBuffer);
return(vertexArray);
}
/// <summary>
/// Create a <see cref="VertexArrays"/> 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 = (VertexArrays)ctx.GetSharedResource(vertexArrayId);
Dictionary <char, Glyph> glyphsDb = null;
if (_VertexArrays == null)
{
_VertexArrays = new VertexArrays();
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
ArrayBuffer <Vertex2f> gVertexPosition = new ArrayBuffer <Vertex2f>();
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 resources for rendering glyphs.
/// </summary>
/// <param name="ctx"></param>
private void LinkSharedResources(GraphicsContext ctx)
{
CheckCurrentContext(ctx);
StringFormat stringFormat = StringFormat.GenericTypographic;
// Font-wide resources
string resourceClassId = "OpenGL.Objects.FontTextureArray2d";
string resourceBaseId = String.Format("{0}.{1}-{2}-{3}", resourceClassId, Family, Size, Style);
#region Instanced Arrays
if (ctx.Extensions.InstancedArrays)
{
string instanceArrayId = resourceClassId + ".InstanceArray";
_GlyphInstances = (ArrayBufferObjectInterleaved <GlyphInstance>)ctx.GetSharedResource(instanceArrayId);
if (_GlyphInstances == null)
{
_GlyphInstances = new ArrayBufferObjectInterleaved <GlyphInstance>(MapBufferUsageMask.MapWriteBit);
_GlyphInstances.Create(256);
// Share
ctx.SetSharedResource(instanceArrayId, _GlyphInstances);
}
LinkResource(_GlyphInstances);
}
else
{
_GlyphInstances = null;
}
#endregion
#region Vertex Array
string vertexArrayId = resourceClassId + ".VertexArray";
_VertexArrays = (VertexArrays)ctx.GetSharedResource(vertexArrayId);
if (_VertexArrays == null)
{
_VertexArrays = new VertexArrays();
ArrayBuffer <Vertex2f> arrayPosition = new ArrayBuffer <Vertex2f>();
arrayPosition.Create(new Vertex2f[] {
new Vertex2f(0.0f, 1.0f),
new Vertex2f(0.0f, 0.0f),
new Vertex2f(1.0f, 1.0f),
new Vertex2f(1.0f, 0.0f),
});
_VertexArrays.SetArray(arrayPosition, VertexArraySemantic.Position);
if (ctx.Extensions.InstancedArrays)
{
_VertexArrays.SetInstancedArray(_GlyphInstances, 0, 1, "glo_GlyphModelViewProjection");
_VertexArrays.SetInstancedArray(_GlyphInstances, 1, 1, "glo_GlyphVertexParams");
_VertexArrays.SetInstancedArray(_GlyphInstances, 2, 1, "glo_GlyphTexParams");
}
_VertexArrays.SetElementArray(PrimitiveType.TriangleStrip);
// Share
ctx.SetSharedResource(vertexArrayId, _VertexArrays);
}
LinkResource(_VertexArrays);
#endregion
#region Glyphs Metadata
string glyphDbId = resourceBaseId + ".GlyphDb";
_GlyphMetadata = (Dictionary <char, Glyph>)ctx.GetSharedResource(glyphDbId);
if (_GlyphMetadata == null)
{
_GlyphMetadata = new Dictionary <char, Glyph>();
char[] fontChars = GetFontCharacters().ToCharArray();
uint layer = 0;
using (Bitmap bitmap = new Bitmap(1, 1))
using (Graphics g = Graphics.FromImage(bitmap))
using (System.Drawing.Font font = new System.Drawing.Font(Family, Size, Style))
{
// Avoid grid fitting
g.TextRenderingHint = TextRenderingHint.AntiAlias;
float glyphHeight = font.GetHeight();
foreach (char c in fontChars)
{
SizeF glyphSize;
switch (c)
{
case ' ':
glyphSize = g.MeasureString(c.ToString(), font, 0, StringFormat.GenericDefault);
break;
default:
glyphSize = g.MeasureString(c.ToString(), font, 0, stringFormat);
break;
}
Glyph glyph = new Glyph(c, glyphSize, layer++, new SizeF(1.0f, 1.0f));
_GlyphMetadata.Add(c, glyph);
}
}
// Share
ctx.SetSharedResource(glyphDbId, _GlyphMetadata);
}
#endregion
#region Glyph Sampler
string samplerId = resourceBaseId + ".Sampler";
Sampler sampler = (Sampler)ctx.GetSharedResource(samplerId);
if (sampler == null)
{
sampler = new Sampler();
sampler.Parameters.MinFilter = TextureMinFilter.Linear;
}
#endregion
#region Glyph Texture
string textureId = resourceBaseId + ".Texture";
_FontTexture = (TextureArray2d)ctx.GetSharedResource(textureId);
if (_FontTexture == null)
{
// Get the size required for all glyphs
float w = 0.0f, h = 0.0f;
uint z = 0;
foreach (Glyph glyph in _GlyphMetadata.Values)
{
w = Math.Max(w, glyph.GlyphSize.Width);
h = Math.Max(h, glyph.GlyphSize.Height);
z = Math.Max(z, glyph.Layer);
}
// Create texture
_FontTexture = new TextureArray2d();
_FontTexture.Sampler = sampler;
_FontTexture.Create(ctx, (uint)Math.Ceiling(w), (uint)Math.Ceiling(h), z + 1, PixelLayout.R8, 1);
using (System.Drawing.Font font = new System.Drawing.Font(Family, Size, Style))
using (Brush brush = new SolidBrush(Color.White))
{
foreach (Glyph glyph in _GlyphMetadata.Values)
{
using (Bitmap bitmap = new Bitmap((int)_FontTexture.Width, (int)_FontTexture.Height, System.Drawing.Imaging.PixelFormat.Format24bppRgb))
using (Graphics g = Graphics.FromImage(bitmap)) {
// Recompute texture scaling
glyph.TexScale = new SizeF(
glyph.GlyphSize.Width / bitmap.Width,
glyph.GlyphSize.Height / bitmap.Height
);
// Avoid grid fitting
g.TextRenderingHint = TextRenderingHint.AntiAlias;
g.Clear(Color.Black);
g.DrawString(glyph.GlyphChar.ToString(), font, brush, 0.0f, 0.0f, stringFormat);
_FontTexture.Create(ctx, PixelLayout.R8, bitmap, glyph.Layer);
}
}
}
// Share
ctx.SetSharedResource(textureId, _FontTexture);
}
LinkResource(_FontTexture);
#endregion
}