public SimpleObjRenderer(Obj file)
{
m_vertexVBO = GL.GenBuffer();
m_indexVBO = GL.GenBuffer();
m_texcoordVBO = file.TexCoords.Count > 0 ? GL.GenBuffer() : -1;
m_normalVBO = file.Normals.Count > 0 ? GL.GenBuffer() : -1;
m_textureVBO = file.Material.DiffuseTexture != null ? GL.GenTexture() : -1;
m_unhighlightedShader = new Shader("UnlitTexture");
m_unhighlightedShader.CompileSource(File.ReadAllText("resources/shaders/UnlitTexture.vert"), ShaderType.VertexShader);
m_unhighlightedShader.CompileSource(File.ReadAllText("resources/shaders/UnlitTexture.frag"), ShaderType.FragmentShader);
m_unhighlightedShader.LinkShader();
m_highlightedShader = new Shader("TransformGizmoHighlight");
m_highlightedShader.CompileSource(File.ReadAllText("resources/shaders/UnlitTexture.vert"), ShaderType.VertexShader);
m_highlightedShader.CompileSource(File.ReadAllText("resources/shaders/TransformGizmoHighlight.frag"), ShaderType.FragmentShader);
m_highlightedShader.LinkShader();
// Generate an array of all vertices instead of the compact form OBJ comes as.
Vector3[] positions = null;
Vector2[] texcoords = null;
Vector3[] normals = null;
int[] triangles = new int[file.Faces.Count * 3];
m_triangleCount = file.Faces.Count;
List<UniqueVertex> uniqueVerts = new List<UniqueVertex>();
for (int i = 0; i < file.Faces.Count; i++)
{
Obj.ObjFace face = file.Faces[i];
for (int k = 0; k < 3; k++)
{
var vertex = new UniqueVertex();
vertex.Position = file.Vertices[face.Positions[k]];
if (face.TexCoords != null) vertex.TexCoord = file.TexCoords[face.TexCoords[k]];
if (face.Normals != null) vertex.Normal = file.Normals[face.Normals[k]];
int vertIndex = uniqueVerts.IndexOf(vertex);
if (vertIndex < 0)
{
uniqueVerts.Add(vertex);
vertIndex = uniqueVerts.Count - 1;
}
triangles[(i * 3) + k] = vertIndex;
}
}
// Copy the data out of the interlaced buffers.
positions = new Vector3[uniqueVerts.Count];
texcoords = file.TexCoords.Count > 0 ? new Vector2[uniqueVerts.Count] : null;
normals = file.Normals.Count > 0 ? new Vector3[uniqueVerts.Count] : null;
m_boundingBox = new FAABox();
for (int i = 0; i < uniqueVerts.Count; i++)
{
positions[i] = uniqueVerts[i].Position;
m_boundingBox.Encapsulate(positions[i]);
if (texcoords != null) texcoords[i] = new Vector2(uniqueVerts[i].TexCoord.X, 1 - uniqueVerts[i].TexCoord.Y);
if (normals != null) normals[i] = uniqueVerts[i].Normal;
}
// Positions
GL.BindBuffer(BufferTarget.ArrayBuffer, m_vertexVBO);
GL.BufferData(BufferTarget.ArrayBuffer, (IntPtr)(12 * positions.Length), positions, BufferUsageHint.StaticDraw);
// Upload Indexes
GL.BindBuffer(BufferTarget.ElementArrayBuffer, m_indexVBO);
GL.BufferData(BufferTarget.ElementArrayBuffer, (IntPtr)(4 * triangles.Length), triangles, BufferUsageHint.StaticDraw);
// Texcoords
if (m_texcoordVBO >= 0)
{
GL.BindBuffer(BufferTarget.ArrayBuffer, m_texcoordVBO);
GL.BufferData(BufferTarget.ArrayBuffer, (IntPtr)(8 * texcoords.Length), texcoords, BufferUsageHint.StaticDraw);
}
// Normals
if (m_normalVBO >= 0)
{
GL.BindBuffer(BufferTarget.ArrayBuffer, m_normalVBO);
GL.BufferData(BufferTarget.ArrayBuffer, (IntPtr)(12 * normals.Length), normals, BufferUsageHint.StaticDraw);
}
// Texture
if (m_textureVBO >= 0)
{
Obj.ObjMaterial mat = file.Material;
GL.BindTexture(TextureTarget.Texture2D, m_textureVBO);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Nearest);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest);
// Black/white checkerboard
float[] pixels = new[]
{
0.0f, 0.0f, 0.0f, 255.0f, 255.0f, 255.0f,
255.0f, 255.0f, 255.0f, 0.0f, 0.0f, 0.0f
};
//GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgb, 2, 2, 0, PixelFormat.Rgb, PixelType.Float, pixels);
System.Drawing.Imaging.BitmapData bmpData = mat.DiffuseTexture.LockBits(new System.Drawing.Rectangle(0, 0, mat.DiffuseTexture.Width, mat.DiffuseTexture.Height), System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, mat.DiffuseTexture.Width, mat.DiffuseTexture.Height, 0, PixelFormat.Bgra, PixelType.UnsignedByte, bmpData.Scan0);
mat.DiffuseTexture.UnlockBits(bmpData);
}
}
