public vec3(vec2 xy, float z)
{
this.x = xy.x;
this.y = xy.y;
this.z = z;
}
/// <summary>
///
/// </summary>
/// <param name="min"></param>
/// <param name="max"></param>
public BoundingBox2D(vec2 min, vec2 max)
{
this.MinPosition = min;
this.MaxPosition = max;
}
/// <summary>
/// Reads mesh's vertexes, normals and faces.
/// </summary>
/// <param name="context"></param>
public override void Parse(ObjVNFContext context)
{
var objVNF = new ObjVNFMesh();
var vertexes = new vec3[context.vertexCount];
var normals = new vec3[context.normalCount];
var texCoords = new vec2[context.texCoordCount];
var faces = new ObjVNFFace[context.faceCount];
string filename = context.ObjFilename;
int vertexIndex = 0, normalIndex = 0, texCoordIndex = 0, faceIndex = 0;
using (var reader = new System.IO.StreamReader(filename))
{
while (!reader.EndOfStream)
{
string line = reader.ReadLine();
string[] parts = line.Split(separator, StringSplitOptions.RemoveEmptyEntries);
if (parts.Length <= 0)
{
continue;
}
if (parts[0] == "v")
{
vertexes[vertexIndex++] = ParseVec3(parts);
}
else if (parts[0] == "vn")
{
normals[normalIndex++] = ParseVec3(parts);
}
else if (parts[0] == "vt")
{
texCoords[texCoordIndex++] = ParseVec2(parts);
}
else if (parts[0] == "f")
{
faces[faceIndex++] = ParseFace(parts);
}
}
}
objVNF.vertexes = vertexes;
objVNF.normals = normals;
objVNF.texCoords = texCoords;
objVNF.faces = faces;
context.Mesh = objVNF;
if (vertexIndex != context.vertexCount)
{
throw new Exception(string.Format("v: [{0}] not equals to [{1}] in MeshParser!", vertexIndex, context.vertexCount));
}
if (normalIndex != context.normalCount)
{
throw new Exception(string.Format("vn: [{0}] not equals to [{1}] in MeshParser!", normalIndex, context.normalCount));
}
if (texCoordIndex != context.texCoordCount)
{
throw new Exception(string.Format("vt: [{0}] not equals to [{1}] in MeshParser!", texCoordIndex, context.texCoordCount));
}
if (faceIndex != context.faceCount)
{
throw new Exception(string.Format("f: [{0}] not equals to [{1}] in MeshParser!", vertexIndex, context.vertexCount));
}
if (faceIndex > 0)
{
Type type = faces[0].GetType();
for (int i = 1; i < faceIndex; i++)
{
if (faces[i].GetType() != type)
{
throw new Exception(string.Format("Different face types [{0}] vs [{1}]!", type, faces[i].GetType()));
}
}
}
}
public override void Parse(ObjVNFContext context)
{
ObjVNFMesh mesh = context.Mesh;
vec3[] vertexes = mesh.vertexes;// positions
vec2[] texCoords = mesh.texCoords;
vec3[] normals = mesh.normals;
if (vertexes == null || texCoords == null || normals == null)
{
return;
}
if (vertexes.Length != texCoords.Length || vertexes.Length != normals.Length)
{
return;
}
ObjVNFFace[] faces = mesh.faces;
if (faces == null || faces.Length == 0)
{
return;
}
// if (not triangles) { return; }
if (faces[0].VertexIndexes().Count() != 3)
{
return;
}
var tangents = new vec3[normals.Length];
for (int i = 0; i < faces.Length; i++)
{
var face = faces[i] as ObjVNFTriangle;
if (face == null)
{
return;
} // no dealing with quad.
uint[] vertexIndexes = face.VertexIndexes();
vec3 p0 = vertexes[vertexIndexes[0]];
vec3 p1 = vertexes[vertexIndexes[1]];
vec3 p2 = vertexes[vertexIndexes[2]];
vec2 uv0 = texCoords[vertexIndexes[0]];
vec2 uv1 = texCoords[vertexIndexes[1]];
vec2 uv2 = texCoords[vertexIndexes[2]];
vec3 q0 = p1 - p0, q1 = p2 - p0;
float u0 = uv0.x, v0 = uv0.y, u1 = uv1.x, v1 = uv1.y, u2 = uv2.x, v2 = uv2.y;
float coefficient = 1.0f / ((u1 - u0) * (v2 - v0) - (v1 - v0) * (u2 - u0));
vec3 tangentFace;
tangentFace.x = (v2 - v0) * q0.x + (v0 - v1) * q1.x;
tangentFace.y = (v2 - v0) * q0.y + (v0 - v1) * q1.y;
tangentFace.z = (v2 - v0) * q0.z + (v0 - v1) * q1.z;
//vec3 binormalFace;
//binormalFace.x = (u0 - u2) * q0.x + (u1 - u0) * q1.x;
//binormalFace.y = (u0 - u2) * q0.y + (u1 - u0) * q1.y;
//binormalFace.z = (u0 - u2) * q0.z + (u1 - u0) * q1.z;
for (int t = 0; t < vertexIndexes.Length; t++)
{
vec3 n = normals[vertexIndexes[t]].normalize();
tangents[vertexIndexes[t]] = tangentFace - tangentFace.dot(n) * n;
}
}
mesh.tangents = tangents;
}
///// <summary>
///// Index of the the texture which this glyph belongs to in the 2D texture array.
///// 此字符所在的纹理，在二维纹理数组中的索引。
///// </summary>
//public readonly int textureIndex;
/// <summary>
/// Information of rendering a glyph.
/// 绘制一个字符（串）所需要的信息。
/// </summary>
/// <param name="characters">The glyph(a character or a string).此字符（串）。</param>
/// <param name="leftTop">UV of left top.此字符的字形在纹理的横向偏移量（左上角uv）</param>
/// <param name="rightBottom">UV of right bottom.此字符的字形在纹理的纵向偏移量（右下角uv）</param>
/// <param name="textureIndex">Index of the the texture which this glyph belongs to in the 2D texture array.此字符所在的纹理，在二维纹理数组中的索引。</param>
public GlyphInfo(string characters, vec2 leftTop, vec2 rightBottom, int textureIndex)
{
this.characters = characters;
this.quad = new QuadSTRStruct(leftTop, rightBottom, textureIndex);
}
/// <summary>
/// start from (0, 0) to the right.
/// </summary>
/// <param name="text"></param>
/// <param name="server"></param>
/// <param name="totalWidth"></param>
/// <param name="totalHeight"></param>
unsafe private void PositionPass(string text, GlyphServer server,
out float totalWidth, out float totalHeight)
{
int textureWidth = server.TextureWidth;
int textureHeight = server.TextureHeight;
VertexBuffer buffer = this.positionBuffer;
var positionArray = (QuadPositionStruct *)buffer.MapBuffer(MapBufferAccess.ReadWrite);
const float height = 2.0f; // let's say height is 2.0f.
totalWidth = 0;
totalHeight = height;
int index = 0;
foreach (var c in text)
{
if (index >= this.labelModel.Capacity)
{
break;
}
GlyphInfo glyphInfo;
float wByH = 0;
if (server.GetGlyphInfo(c, out glyphInfo))
{
float w = (glyphInfo.quad.rightBottom.x - glyphInfo.quad.leftBottom.x) * textureWidth;
float h = (glyphInfo.quad.rightBottom.y - glyphInfo.quad.rightTop.y) * textureHeight;
wByH = height * w / h;
}
else
{
// put an empty glyph(square) here.
wByH = height * 1.0f / 1.0f;
}
var leftTop = new vec2(totalWidth, height / 2);
var leftBottom = new vec2(totalWidth, -height / 2);
var rightBottom = new vec2(totalWidth + wByH, -height / 2);
var rightTop = new vec2(totalWidth + wByH, height / 2);
positionArray[index++] = new QuadPositionStruct(leftTop, leftBottom, rightBottom, rightTop);
totalWidth += wByH;
}
// move to center.
const float scale = 1f;
for (int i = 0; i < text.Length; i++)
{
if (i >= this.labelModel.Capacity)
{
break;
}
QuadPositionStruct quad = positionArray[i];
var newPos = new QuadPositionStruct(
// y is already in [-1, 1], so just shrink x to [-1, 1]
new vec2(quad.leftTop.x / totalWidth * 2.0f - 1f, quad.leftTop.y) * scale,
new vec2(quad.leftBottom.x / totalWidth * 2.0f - 1f, quad.leftBottom.y) * scale,
new vec2(quad.rightBottom.x / totalWidth * 2.0f - 1f, quad.rightBottom.y) * scale,
new vec2(quad.rightTop.x / totalWidth * 2.0f - 1f, quad.rightTop.y) * scale
);
positionArray[i] = newPos;
}
buffer.UnmapBuffer();
}
// https://www.cnblogs.com/bitzhuwei/p/opengl-Computing-Tangent-Space-Basis-Vectors.html
public override void Parse(ObjVNFContext context)
{
ObjVNFMesh mesh = context.Mesh;
vec3[] vertexes = mesh.vertexes;// positions
vec2[] texCoords = mesh.texCoords;
vec3[] normals = mesh.normals;
if (vertexes == null || texCoords == null || normals == null)
{
return;
}
if (vertexes.Length != texCoords.Length || vertexes.Length != normals.Length)
{
return;
}
ObjVNFFace[] faces = mesh.faces;
if (faces == null || faces.Length == 0)
{
return;
}
// if (not triangles) { return; }
if (faces[0].VertexIndexes().Count() != 3)
{
return;
}
var tangents = new vec3[normals.Length];
var biTangents = new vec3[normals.Length];
for (int i = 0; i < faces.Length; i++)
{
var face = faces[i] as ObjVNFTriangle;
if (face == null)
{
return;
} // no dealing with quad.
uint[] vertexIndexes = face.VertexIndexes();
uint i0 = vertexIndexes[0];
uint i1 = vertexIndexes[1];
uint i2 = vertexIndexes[2];
vec3 p0 = vertexes[i0];
vec3 p1 = vertexes[i1];
vec3 p2 = vertexes[i2];
vec2 uv0 = texCoords[i0];
vec2 uv1 = texCoords[i1];
vec2 uv2 = texCoords[i2];
float x1 = p1.x - p0.x;
float y1 = p1.y - p0.y;
float z1 = p1.z - p0.z;
float x2 = p2.x - p0.x;
float y2 = p2.y - p0.y;
float z2 = p2.z - p0.z;
float s1 = uv1.x - uv0.x;
float t1 = uv1.y - uv0.y;
float s2 = uv2.x - uv0.x;
float t2 = uv2.y - uv0.y;
float r = 1.0F / (s1 * t2 - s2 * t1);
var sdir = new vec3((t2 * x1 - t1 * x2) * r, (t2 * y1 - t1 * y2) * r,
(t2 * z1 - t1 * z2) * r);
var tdir = new vec3((s1 * x2 - s2 * x1) * r, (s1 * y2 - s2 * y1) * r,
(s1 * z2 - s2 * z1) * r);
//tangents[i0] += sdir;
tangents[i0] = (float)i / (float)(i + 1) * tangents[i0] + sdir / (float)(i + 1);
//tangents[i1] += sdir;
tangents[i1] = (float)i / (float)(i + 1) * tangents[i1] + sdir / (float)(i + 1);
//tangents[i2] += sdir;
tangents[i2] = (float)i / (float)(i + 1) * tangents[i2] + sdir / (float)(i + 1);
//biTangents[i0] += tdir;
biTangents[i0] = (float)i / (float)(i + 1) * biTangents[i0] + sdir / (float)(i + 1);
//biTangents[i1] += tdir;
biTangents[i1] = (float)i / (float)(i + 1) * biTangents[i1] + sdir / (float)(i + 1);
//biTangents[i2] += tdir;
biTangents[i2] = (float)i / (float)(i + 1) * biTangents[i2] + sdir / (float)(i + 1);
}
var finalTangents = new vec4[normals.Length];
for (long a = 0; a < normals.Length; a++)
{
vec3 n = normals[a];
vec3 t = tangents[a];
// Calculate handedness
float w = (n.cross(t).dot(biTangents[a]) < 0.0F) ? -1.0F : 1.0F;
// Gram-Schmidt orthogonalize
finalTangents[a] = new vec4((t - n * n.dot(t)).normalize(), w);
}
mesh.tangents = finalTangents;
}
public static vec2 ToVec2(this float[] array, int startIndex = 0)
{
vec2 result = new vec2(array[startIndex], array[startIndex + 1]);
return(result);
}
public override void SetUniform(ShaderProgram program)
{
vec2 value = this.value;
program.SetUniform(VarName, value.x, value.y);
}
