private void timerUpdateFrame_Tick(object sender, EventArgs e)
{
GL.BindBuffer(BufferTarget.ElementArrayBuffer, ibo_elements);
GL.BufferData(BufferTarget.ElementArrayBuffer, (IntPtr)(indicedata.Length * sizeof(int)), indicedata, BufferUsageHint.StaticDraw);
GL.BindBuffer(BufferTarget.ArrayBuffer, vbo_position);
GL.BufferData <Vector3>(BufferTarget.ArrayBuffer, (IntPtr)(vertdata.Length * Vector3.SizeInBytes), vertdata, BufferUsageHint.StaticDraw);
GL.VertexAttribPointer(attribute_vpos, 3, VertexAttribPointerType.Float, false, 0, 0);
GL.BindBuffer(BufferTarget.ArrayBuffer, vbo_color);
GL.BufferData <Vector3>(BufferTarget.ArrayBuffer, (IntPtr)(coldata.Length * Vector3.SizeInBytes), coldata, BufferUsageHint.StaticDraw);
GL.VertexAttribPointer(attribute_vcol, 3, VertexAttribPointerType.Float, true, 0, 0);
GL.UseProgram(pgmID);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
var perspectiveFov = Matrix4.CreatePerspectiveFieldOfView(ExtensionGL.Radians(FOV), aspect, ZNEAR, ZFAR);
foreach (Volume v in objs)
{
v.ViewProjectionMatrix = camera.GetViewMatrix() * perspectiveFov;
v.ModelViewProjectionMatrix = transform * v.ModelMatrix * v.ViewProjectionMatrix;
}
panelOpenGL.Invalidate();
}
private void getRotateAroundCamera(Point endPoint)
{
float adjustPos = (float)Math.Tan(ExtensionGL.Radians(FOV / 2.0f)) * 0.1f / (panelOpenGL.Height / 2.0f);
float dx = (endPoint.X - startPoint.X);
float dy = (endPoint.Y - startPoint.Y);
float dxmin = panelOpenGL.Width / 100f;
float dymin = panelOpenGL.Height / 100f;
float x = (Math.Abs(dx) >= dxmin) ? dx * adjustPos : 0;
float y = (Math.Abs(dy) >= dymin) ? dy * adjustPos : 0;
Vector3 perp = new Vector3(-y, -x, 0f);
float theta = (float)Math.Atan(perp.Length / 0.1f);
//Compute the length of the perpendicular vector
if (perp.Length > float.Epsilon) //if its non-zero
{
// Return the perpendicular vector as the transform after all
rotation.X = perp.X;
rotation.Y = perp.Y;
rotation.Z = perp.Z;
//In the quaternion values, w is cosine (theta / 2), where theta is the rotation angle
rotation.W = (float)Math.Cos(theta / 2);
var trans = new Transform3DGroup();
trans.TranslateBy(-camera.Position);
trans.RotateBy(rotation);
trans.TranslateBy(camera.Position);
currentTrans = trans;
updateModelMatricies();
}
}
private Vector3 getPointerPositionOnObjectPlane(Point endPoint)
{
// 3D line equation by 2 points camera position "Vc" and near plane position "Vn" (from mouse position)
// V = Vc + t*(a,b,c)
// with (a,b,c) = Vn - Vc;
float adjustPos = (float)Math.Tan(ExtensionGL.Radians(FOV / 2.0f)) * 0.1f / (panelOpenGL.Height / 2.0f);
float dx = (endPoint.X - panelOpenGL.Width / 2);
float dy = (endPoint.Y - panelOpenGL.Height / 2);
float xn = dx * adjustPos;
float yn = -dy * adjustPos;
Vector3 vn = new Vector3(xn, yn, camera.Position.Z - ZNEAR);
Vector3 vc = camera.Position;
Vector3 abc = vn - vc;
Matrix4 tmpTrans = getPreviousTransform();
Vector3 objectOrigin = tmpTrans.ExtractTranslation();
Vector3 v = new Vector3();
v.Z = objectOrigin.Z;
float t = (v.Z - vc.Z) / abc.Z;
v.X = t * abc.X;
v.Y = t * abc.Y;
return(v);
}
private void panelOpenGL_Resize(object sender, EventArgs e)
{
GL.Viewport(panelOpenGL.ClientRectangle);
aspect = panelOpenGL.ClientSize.Width / (float)panelOpenGL.ClientSize.Height;
var projection = Matrix4.CreatePerspectiveFieldOfView(ExtensionGL.Radians(FOV), aspect, ZNEAR, ZFAR);
GL.MatrixMode(MatrixMode.Projection);
GL.LoadMatrix(ref projection);
}
private void initProgram()
{
camera.Position = new Vector3(0f, 0f, 1f);
pgmID = GL.CreateProgram();
ExtensionGL.LoadShader("Shaders/vs.glsl", ShaderType.VertexShader, pgmID, out vsID);
ExtensionGL.LoadShader("Shaders/fs.glsl", ShaderType.FragmentShader, pgmID, out fsID);
GL.LinkProgram(pgmID);
attribute_vpos = GL.GetAttribLocation(pgmID, "vPos");
attribute_vcol = GL.GetAttribLocation(pgmID, "vColor");
uniform_mview = GL.GetUniformLocation(pgmID, "modelView");
if (attribute_vpos == -1 || attribute_vcol == -1 || uniform_mview == -1)
{
MessageBox.Show("Error binding attributes [vPos vColor modelView]" +
$"= [{attribute_vpos} {attribute_vcol} {uniform_mview}]", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
GL.GenBuffers(1, out vbo_position);
GL.GenBuffers(1, out vbo_color);
GL.GenBuffers(1, out vbo_mview);
GL.GenBuffers(1, out ibo_elements);
}
