private float m_rotAngle; // angle of cube rotation
#endregion
/// <summary>
/// We initialize the matrices and the vertices for the wire frame cube
/// </summary>
public frmHelloCube()
{
// Create matrices
m_modelMatrix = new SLMat4f();
m_viewMatrix = new SLMat4f();
m_projectionMatrix = new SLMat4f();
m_viewportMatrix = new SLMat4f();
// define the 8 vertices of a cube
m_v = new SLVec3f[8];
m_v[0] = new SLVec3f(-0.5f, -0.5f, 0.5f); // front lower left
m_v[1] = new SLVec3f(0.5f, -0.5f, 0.5f); // front lower right
m_v[2] = new SLVec3f(0.5f, 0.5f, 0.5f); // front upper right
m_v[3] = new SLVec3f(-0.5f, 0.5f, 0.5f); // front upper left
m_v[4] = new SLVec3f(-0.5f, -0.5f, -0.5f); // back lower left
m_v[5] = new SLVec3f(0.5f, -0.5f, -0.5f); // back lower right
m_v[6] = new SLVec3f(0.5f, 0.5f, -0.5f); // back upper left
m_v[7] = new SLVec3f(-0.5f, 0.5f, -0.5f); // back upper right
m_camZ = -4; // backwards movement of the camera
m_rotAngle = 0; // initial rotation angle
// Without double buffering it would flicker
this.DoubleBuffered = true;
InitializeComponent();
}
/// <summary>
/// Post multiplies a translation matrix defined by the vector t
/// </summary>
public void Translate(SLVec3f t)
{
SLMat4f Tr = new SLMat4f();
Tr.Translation(t);
Multiply(Tr);
}
/// <summary>
/// Post multiplies a rotation matrix defined by
/// the angle degAng and the rotation axis [axisx,axisy,axisz]
/// </summary>
public void Rotate(float degAng, float axisx, float axisy, float axisz)
{
SLMat4f R = new SLMat4f();
R.Rotation(degAng, axisx, axisy, axisz);
Multiply(R);
}
/// <summary>
/// Post multiplies a scaling matrix defined by the vector s
/// </summary>
public void Scale(SLVec3f s)
{
SLMat4f S = new SLMat4f();
S.Scaling(s);
Multiply(S);
}
private bool m_mouseLeftDown; // flag if mouse is down
#endregion
/// <summary>
/// We intialize the matrices the the vertices foth the wireframe cube
/// </summary>
public frmHelloCube()
{
InitializeComponent();
// Create matrices
m_modelViewMatrix = new SLMat4f();
m_projectionMatrix = new SLMat4f();
m_viewportMatrix = new SLMat4f();
// define the 8 vertices of a cube
m_v = new SLVec3f[8];
m_v[0] = new SLVec3f(-0.5f, -0.5f, 0.5f); // front lower left
m_v[1] = new SLVec3f(0.5f, -0.5f, 0.5f); // front lower right
m_v[2] = new SLVec3f(0.5f, 0.5f, 0.5f); // front upper right
m_v[3] = new SLVec3f(-0.5f, 0.5f, 0.5f); // front upper left
m_v[4] = new SLVec3f(-0.5f, -0.5f, -0.5f); // back lower left
m_v[5] = new SLVec3f(0.5f, -0.5f, -0.5f); // back lower right
m_v[6] = new SLVec3f(0.5f, 0.5f, -0.5f); // back upper right
m_v[7] = new SLVec3f(-0.5f, 0.5f, -0.5f); // back upper left
m_camZ = -2; // backwards movment of the camera
m_rotx = 0;
m_roty = 0;
m_dx = 0;
m_dy = 0;
m_mouseLeftDown = false;
// Without double buffering it would flicker
this.DoubleBuffered = true;
}
/// <summary>
/// Returns the transposed of the matrix
/// </summary>
public SLMat4f Transposed()
{
SLMat4f t = new SLMat4f(this);
t.Transpose();
return(t);
}
/// <summary>
/// Post multiplies the matrix by matrix A
/// </summary>
public void Multiply(SLMat4f A)
{
// | 0 4 8 12 | | 0 4 8 12 |
// | 1 5 9 13 | | 1 5 9 13 |
// M = | 2 6 10 14 | x | 2 6 10 14 |
// | 3 7 11 15 | | 3 7 11 15 |
Set(m[0] * A.m[0] + m[4] * A.m[1] + m[8] * A.m[2] + m[12] * A.m[3], //row 1
m[0] * A.m[4] + m[4] * A.m[5] + m[8] * A.m[6] + m[12] * A.m[7],
m[0] * A.m[8] + m[4] * A.m[9] + m[8] * A.m[10] + m[12] * A.m[11],
m[0] * A.m[12] + m[4] * A.m[13] + m[8] * A.m[14] + m[12] * A.m[15],
m[1] * A.m[0] + m[5] * A.m[1] + m[9] * A.m[2] + m[13] * A.m[3], //row 2
m[1] * A.m[4] + m[5] * A.m[5] + m[9] * A.m[6] + m[13] * A.m[7],
m[1] * A.m[8] + m[5] * A.m[9] + m[9] * A.m[10] + m[13] * A.m[11],
m[1] * A.m[12] + m[5] * A.m[13] + m[9] * A.m[14] + m[13] * A.m[15],
m[2] * A.m[0] + m[6] * A.m[1] + m[10] * A.m[2] + m[14] * A.m[3], //row 3
m[2] * A.m[4] + m[6] * A.m[5] + m[10] * A.m[6] + m[14] * A.m[7],
m[2] * A.m[8] + m[6] * A.m[9] + m[10] * A.m[10] + m[14] * A.m[11],
m[2] * A.m[12] + m[6] * A.m[13] + m[10] * A.m[14] + m[14] * A.m[15],
m[3] * A.m[0] + m[7] * A.m[1] + m[11] * A.m[2] + m[15] * A.m[3], //row 4
m[3] * A.m[4] + m[7] * A.m[5] + m[11] * A.m[6] + m[15] * A.m[7],
m[3] * A.m[8] + m[7] * A.m[9] + m[11] * A.m[10] + m[15] * A.m[11],
m[3] * A.m[12] + m[7] * A.m[13] + m[11] * A.m[14] + m[15] * A.m[15]);
}
/// <summary>
/// Post multiplies a translation matrix defined by the vector [tx,ty,tz]
/// </summary>
public void Translate(float tx, float ty, float tz)
{
SLMat4f Tr = new SLMat4f();
Tr.Translation(tx, ty, tz);
Multiply(Tr);
}
/// <summary>
/// Sets the matrix with the matrix A
/// </summary>
public void Set(SLMat4f A)
{
m[0] = A.m[0]; m[4] = A.m[4]; m[8] = A.m[8]; m[12] = A.m[12];
m[1] = A.m[1]; m[5] = A.m[5]; m[9] = A.m[9]; m[13] = A.m[13];
m[2] = A.m[2]; m[6] = A.m[6]; m[10] = A.m[10]; m[14] = A.m[14];
m[3] = A.m[3]; m[7] = A.m[7]; m[11] = A.m[11]; m[15] = A.m[15];
}
/// <summary>
/// number of vertices and indices
/// </summary>
/// <param name="vSize">vertices</param>
/// <param name="iSize">indices</param>
public Mesh(int vSize, int iSize)
{
vertices = new SLVertex[vSize];
indices = new int[iSize];
color = new SLVec3f();
modelMatrix = new SLMat4f();
}
/// <summary>
/// Matrix - Matrix multiplication
/// </summary>
/// <param name="u">A <see cref="SLMat4f"/> instance.</param>
/// <param name="v">A <see cref="SLMat4f"/> instance.</param>
/// <returns>A new <see cref="SLMat4f"/> instance multiplied by the matrix m</returns>
/// <summary>
public static SLMat4f operator*(SLMat4f m1, SLMat4f m2)
{
SLMat4f m = new SLMat4f(m1);
m.Multiply(m2);
return(m);
}
/// <summary>
/// Post multiplies a scaling matrix defined by the vector [sx,sy,sz]
/// </summary>
public void Scale(float sx, float sy, float sz)
{
SLMat4f S = new SLMat4f();
S.Scaling(sx, sy, sz);
Multiply(S);
}
/// <summary>
/// Post multiplies a rotation matrix defined by
/// the angle degAng and the rotation axis
/// </summary>
public void Rotate(float degAng, SLVec3f axis)
{
SLMat4f R = new SLMat4f();
R.Rotation(degAng, axis);
Multiply(R);
}
/// <summary>
/// The forms paint routine where all drawing happens.
/// </summary>
private void frmHelloCube_Paint(object sender, PaintEventArgs e)
{
// start with identity every frame
m_viewMatrix.Identity();
// view transform: move the coordinate system away from the camera
m_viewMatrix.Translate(0, 0, m_camZ);
// model transform: rotate the coordinate system increasingly
m_modelMatrix.Identity();
//m_modelMatrix.Translate(1, 0, 0);
m_modelMatrix.Rotate(m_rotAngle += 0.05f, 0, 1, 0);
m_modelMatrix.Scale(2, 2, 2);
// build combined matrix out of viewport, projection & modelview matrix
SLMat4f m = new SLMat4f();
m.Multiply(m_viewportMatrix);
m.Multiply(m_projectionMatrix);
m.Multiply(m_viewMatrix);
m.Multiply(m_modelMatrix);
// transform all vertices into screen space (x & y in pixels and z as the depth)
SLVec3f[] v2 = new SLVec3f[8];
for (int i = 0; i < m_v.Length; ++i)
{
v2[i] = m.Multiply(m_v[i]);
}
Graphics g = e.Graphics;
g.SmoothingMode = SmoothingMode.AntiAlias;
// draw front square
g.DrawLine(Pens.Red, v2[0].x, v2[0].y, v2[1].x, v2[1].y);
g.DrawLine(Pens.Red, v2[1].x, v2[1].y, v2[2].x, v2[2].y);
g.DrawLine(Pens.Red, v2[2].x, v2[2].y, v2[3].x, v2[3].y);
g.DrawLine(Pens.Red, v2[3].x, v2[3].y, v2[0].x, v2[0].y);
// draw back square
g.DrawLine(Pens.Green, v2[4].x, v2[4].y, v2[5].x, v2[5].y);
g.DrawLine(Pens.Green, v2[5].x, v2[5].y, v2[6].x, v2[6].y);
g.DrawLine(Pens.Green, v2[6].x, v2[6].y, v2[7].x, v2[7].y);
g.DrawLine(Pens.Green, v2[7].x, v2[7].y, v2[4].x, v2[4].y);
// draw from front corners to the back corners
g.DrawLine(Pens.Blue, v2[0].x, v2[0].y, v2[4].x, v2[4].y);
g.DrawLine(Pens.Blue, v2[1].x, v2[1].y, v2[5].x, v2[5].y);
g.DrawLine(Pens.Blue, v2[2].x, v2[2].y, v2[6].x, v2[6].y);
g.DrawLine(Pens.Blue, v2[3].x, v2[3].y, v2[7].x, v2[7].y);
// Tell the system that the window should be repaint again
this.Invalidate();
}
/// <summary>
/// Retrieves the camera vectors eye, at and up if this matrix would be a view matrix
/// </summary>
/// <param name="Eye"></param>
/// <param name="At"></param>
/// <param name="Up"></param>
public void GetLookAt(ref SLVec3f Eye, ref SLVec3f At, ref SLVec3f Up)
{
SLMat4f invRot = new SLMat4f(this);
SLVec3f translation = new SLVec3f(m[12], m[13], m[14]);
invRot.m[12] = 0;
invRot.m[13] = 0;
invRot.m[14] = 0;
invRot.Transpose();
Eye.Set(invRot.Multiply(-translation)); // vector to the eye
Up.Set(m[1], m[5], m[9]); // normalized look up vector
At.Set(-m[2], -m[6], -m[10]); // normalized look at vector
}
/// <summary>
/// We initialize the matrices and the vertices for the wire frame cube
/// </summary>
public frmHelloCube()
{
// Create matrices
m_viewMatrix = new SLMat4f();
m_projectionMatrix = new SLMat4f();
m_viewportMatrix = new SLMat4f();
m_rotationMatrix = new SLMat4f();
light = new SLLight();
phongActive = false;
xWireframeActive = false;
m_camZ = -5.5f; // backwards movement of the camera
m_cam = new SLVec3f(0, 0, m_camZ);
add_rotAxis = new SLVec3f();
tForce = 0.1f;
preCursorPosition = new SLVec3f();
cursorPosition = new SLVec3f();
sw = new Stopwatch();
sw.Start();
second = new TimeSpan(0, 0, 1);
fps = 0;
meshes = new List <Mesh>();
Cube c1 = new Cube(1f);
c1.modelMatrix.Translate(-.5f, 0, 0);
c1.color = colorGreen;
Sphere s1 = new Sphere(1.5f, 15, 15);
s1.modelMatrix.Translate(.5f, 0, 0);
s1.color = colorRed;
meshes.Add(c1);
meshes.Add(s1);
// Without double buffering it would flicker
this.DoubleBuffered = true;
InitializeComponent();
}
/// <summary>
/// Returns a value indicating whether this instance is equal to
/// the specified object.
/// </summary>
/// <param name="obj">An object to compare to this instance.</param>
/// <returns>True if <paramref name="obj"/> is a <see cref="SLMat3f"/> and has the same values as this instance; otherwise, False.</returns>m[3].ToString("0.00") + " " + m[7].ToString("0.00") + " " + m[11].ToString("0.00") + " " + m[15].ToString("0.00"));
public override bool Equals(object obj)
{
if (obj is SLMat4f)
{
SLMat4f m = (SLMat4f)obj;
return((this.m[0] == m.m[0]) &&
(this.m[1] == m.m[1]) &&
(this.m[2] == m.m[2]) &&
(this.m[3] == m.m[3]) &&
(this.m[4] == m.m[4]) &&
(this.m[5] == m.m[5]) &&
(this.m[6] == m.m[6]) &&
(this.m[7] == m.m[7]) &&
(this.m[8] == m.m[8]) &&
(this.m[9] == m.m[9]) &&
(this.m[10] == m.m[10]) &&
(this.m[11] == m.m[11]) &&
(this.m[12] == m.m[12]) &&
(this.m[13] == m.m[13]) &&
(this.m[14] == m.m[14]) &&
(this.m[15] == m.m[15]));
}
return(false);
}
/// <summary>
/// OnRenderFrame is called on every frame for rendering
/// </summary>
/// <param name="e">event arguments</param>
protected override void OnRenderFrame(FrameEventArgs e)
{
base.OnRenderFrame(e);
// Clear the color & depth buffer
gl.Clear(ClearBufferMask.ColorBufferBit |
ClearBufferMask.DepthBufferBit);
// Start with identity every frame
_viewMatrix.Identity();
// View transform: move the coordinate system away from the camera
_viewMatrix.Translate(0, 0, _camZ);
// View transform: rotate the coordinate system increasingly
_viewMatrix.Rotate(_rotX + _deltaX, 1, 0, 0);
_viewMatrix.Rotate(_rotY + _deltaY, 0, 1, 0);
// Transform light position & direction into view space
SLVec3f lightPosVS = _viewMatrix * _lightPos;
// The light dir is not a position. We only take the rotation of the mv matrix.
SLMat3f viewRot = _viewMatrix.Mat3();
SLVec3f lightDirVS = viewRot * _lightDir;
// Rotate the model so that we see it
_modelMatrix.Identity();
_modelMatrix.Rotate(90, -1, 0, 0);
// Build the combined modelview-projection matrix
SLMat4f mvp = new SLMat4f(_projectionMatrix);
SLMat4f mv = new SLMat4f(_viewMatrix);
mv.Multiply(_modelMatrix);
mvp.Multiply(mv);
// Build normal matrix
SLMat3f nm = mv.InverseTransposed();
// Pass the matrix uniform variables
unsafe
{ gl.UniformMatrix4(_mvMatrixLoc, 1, false, mv.m);
gl.UniformMatrix3(_nMatrixLoc, 1, false, nm.m);
gl.UniformMatrix4(_mvpMatrixLoc, 1, false, mvp.m);
// Pass lighting uniforms variables
gl.Uniform4(_globalAmbiLoc, 1, (float[])_globalAmbi);
gl.Uniform3(_lightPosVSLoc, 1, (float[])lightPosVS);
gl.Uniform3(_lightSpotDirVSLoc, 1, (float[])lightDirVS);
gl.Uniform4(_lightAmbientLoc, 1, (float[])_lightAmbient);
gl.Uniform4(_lightDiffuseLoc, 1, (float[])_lightDiffuse);
gl.Uniform4(_lightSpecularLoc, 1, (float[])_lightSpecular);
gl.Uniform4(_matAmbientLoc, 1, (float[])_matAmbient);
gl.Uniform4(_matDiffuseLoc, 1, (float[])_matDiffuse);
gl.Uniform4(_matSpecularLoc, 1, (float[])_matSpecular);
gl.Uniform4(_matEmissiveLoc, 1, (float[])_matEmissive); }
gl.Uniform1(_matShininessLoc, _matShininess);
gl.Uniform1(_texture0Loc, 0);
//////////////////////
// Draw with 2 VBOs //
//////////////////////
// Enable all of the vertex attribute arrays
gl.EnableVertexAttribArray(_pLoc);
gl.EnableVertexAttribArray(_nLoc);
gl.EnableVertexAttribArray(_tLoc);
// Activate VBOs
gl.BindBuffer(BufferTarget.ArrayBuffer, _vboV);
gl.BindBuffer(BufferTarget.ElementArrayBuffer, _vboI);
// Activate Texture
gl.BindTexture(TextureTarget.Texture2D, _textureID);
// For VBO only offset instead of data pointer
int stride = 32;
int offsetN = 3 * sizeof(float);
int offsetT = 6 * sizeof(float);
gl.VertexAttribPointer(_pLoc, 3, VertexAttribPointerType.Float, false, stride, 0);
gl.VertexAttribPointer(_nLoc, 3, VertexAttribPointerType.Float, false, stride, offsetN);
gl.VertexAttribPointer(_tLoc, 2, VertexAttribPointerType.Float, false, stride, offsetT);
/////////////////////////////////////////////////////////////////////////////
// Draw cube model triangles by indexes
gl.DrawElements(BeginMode.Triangles, _numI, DrawElementsType.UnsignedInt, 0);
/////////////////////////////////////////////////////////////////////////////
// Deactivate buffers
gl.BindBuffer(BufferTarget.ArrayBuffer, 0);
gl.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
// Disable the vertex arrays
gl.DisableVertexAttribArray(_pLoc);
gl.DisableVertexAttribArray(_nLoc);
gl.DisableVertexAttribArray(_tLoc);
// Fast copy the back buffer to the front buffer. This is OS dependent.
SwapBuffers();
// Check for errors
glUtils.GetGLError("OnRenderFrame", true);
}
/// <summary>
/// Copy constructor
/// </summary>
public SLMat4f(SLMat4f A)
{
Set(A);
}
/// <summary>
/// Returns the inverse of the matrix
/// </summary>
/// <returns></returns>
public SLMat4f Inverse()
{
SLMat4f I = new SLMat4f();
// Code from Mesa-2.2\src\glu\project.c
float det, d12, d13, d23, d24, d34, d41;
// Inverse = adjoint / det. (See linear algebra texts.)
// pre-compute 2x2 dets for last two rows when computing
// cof_actors of first two rows.
d12 = (m[2] * m[7] - m[3] * m[6]);
d13 = (m[2] * m[11] - m[3] * m[10]);
d23 = (m[6] * m[11] - m[7] * m[10]);
d24 = (m[6] * m[15] - m[7] * m[14]);
d34 = (m[10] * m[15] - m[11] * m[14]);
d41 = (m[14] * m[3] - m[15] * m[2]);
I.m[0] = (m[5] * d34 - m[9] * d24 + m[13] * d23);
I.m[1] = -(m[1] * d34 + m[9] * d41 + m[13] * d13);
I.m[2] = (m[1] * d24 + m[5] * d41 + m[13] * d12);
I.m[3] = -(m[1] * d23 - m[5] * d13 + m[9] * d12);
// Compute determinant as early as possible using these cof_actors.
det = m[0] * I.m[0] + m[4] * I.m[1] + m[8] * I.m[2] + m[12] * I.m[3];
// Run singularity test.
if (Math.Abs(det) <= 0.00005)
{
throw new DivideByZeroException("Matrix is singular. Inversion impossible.");
}
else
{
float invDet = 1 / det;
// Compute rest of inverse.
I.m[0] *= invDet;
I.m[1] *= invDet;
I.m[2] *= invDet;
I.m[3] *= invDet;
I.m[4] = -(m[4] * d34 - m[8] * d24 + m[12] * d23) * invDet;
I.m[5] = (m[0] * d34 + m[8] * d41 + m[12] * d13) * invDet;
I.m[6] = -(m[0] * d24 + m[4] * d41 + m[12] * d12) * invDet;
I.m[7] = (m[0] * d23 - m[4] * d13 + m[8] * d12) * invDet;
// Pre-compute 2x2 dets for first two rows when computing
// cofactors of last two rows.
d12 = m[0] * m[5] - m[1] * m[4];
d13 = m[0] * m[9] - m[1] * m[8];
d23 = m[4] * m[9] - m[5] * m[8];
d24 = m[4] * m[13] - m[5] * m[12];
d34 = m[8] * m[13] - m[9] * m[12];
d41 = m[12] * m[1] - m[13] * m[0];
I.m[8] = (m[7] * d34 - m[11] * d24 + m[15] * d23) * invDet;
I.m[9] = -(m[3] * d34 + m[11] * d41 + m[15] * d13) * invDet;
I.m[10] = (m[3] * d24 + m[7] * d41 + m[15] * d12) * invDet;
I.m[11] = -(m[3] * d23 - m[7] * d13 + m[11] * d12) * invDet;
I.m[12] = -(m[6] * d34 - m[10] * d24 + m[14] * d23) * invDet;
I.m[13] = (m[2] * d34 + m[10] * d41 + m[14] * d13) * invDet;
I.m[14] = -(m[2] * d24 + m[6] * d41 + m[14] * d12) * invDet;
I.m[15] = (m[2] * d23 - m[6] * d13 + m[10] * d12) * invDet;
}
return(I);
}
/// <summary>
/// OnLoad is called once at the beginning for OpenGL inits.
/// </summary>
/// <param name="e"></param>
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
BuildSquare();
_viewMatrix = new SLMat4f();
_modelMatrix = new SLMat4f();
_projectionMatrix = new SLMat4f();
// Set light parameters
_globalAmbi = new SLVec4f(0.0f, 0.0f, 0.0f);
_lightPos = new SLVec3f(0.0f, 0.0f, 100.0f);
_lightDir = new SLVec3f(0.0f, 0.0f, -1.0f);
_lightAmbient = new SLVec4f(0.1f, 0.1f, 0.1f);
_lightDiffuse = new SLVec4f(1.0f, 1.0f, 1.0f);
_lightSpecular = new SLVec4f(1.0f, 1.0f, 1.0f);
_matAmbient = new SLVec4f(1.0f, 1.0f, 1.0f);
_matDiffuse = new SLVec4f(1.0f, 1.0f, 1.0f);
_matSpecular = new SLVec4f(1.0f, 1.0f, 1.0f);
_matEmissive = new SLVec4f(0.0f, 0.0f, 0.0f);
_matShininess = 100.0f;
// backwards movement of the camera
_camZ = -3.0f;
// Mouse rotation parameters
_rotX = 0;
_rotY = 0;
_deltaX = 0;
_deltaY = 0;
_mouseLeftDown = false;
// Load textures
_textureID = glUtils.BuildTexture("../_data/images/textures/earth2048_C.jpg",
TextureMinFilter.LinearMipmapLinear,
TextureMagFilter.Linear,
TextureWrapMode.Repeat,
TextureWrapMode.Repeat);
// Load, compile & link shaders
_shaderVertID = glUtils.BuildShader("../_data/shaders/ADSTex.vert", ShaderType.VertexShader);
_shaderFragID = glUtils.BuildShader("../_data/shaders/ADSTex.frag", ShaderType.FragmentShader);
_shaderProgID = glUtils.BuildProgram(_shaderVertID, _shaderFragID);
// Activate the shader program
gl.UseProgram(_shaderProgID);
// Get the variable locations (identifiers) within the program
_pLoc = gl.GetAttribLocation(_shaderProgID, "a_position");
_nLoc = gl.GetAttribLocation(_shaderProgID, "a_normal");
_tLoc = gl.GetAttribLocation(_shaderProgID, "a_texCoord");
_mvMatrixLoc = gl.GetUniformLocation(_shaderProgID, "u_mvMatrix");
_mvpMatrixLoc = gl.GetUniformLocation(_shaderProgID, "u_mvpMatrix");
_nMatrixLoc = gl.GetUniformLocation(_shaderProgID, "u_nMatrix");
_globalAmbiLoc = gl.GetUniformLocation(_shaderProgID, "u_globalAmbi");
_lightPosVSLoc = gl.GetUniformLocation(_shaderProgID, "u_lightPosVS");
_lightSpotDirVSLoc = gl.GetUniformLocation(_shaderProgID, "u_lightSpotDirVS");
_lightAmbientLoc = gl.GetUniformLocation(_shaderProgID, "u_lightAmbient");
_lightDiffuseLoc = gl.GetUniformLocation(_shaderProgID, "u_lightDiffuse");
_lightSpecularLoc = gl.GetUniformLocation(_shaderProgID, "u_lightSpecular");
_matAmbientLoc = gl.GetUniformLocation(_shaderProgID, "u_matAmbient");
_matDiffuseLoc = gl.GetUniformLocation(_shaderProgID, "u_matDiffuse");
_matSpecularLoc = gl.GetUniformLocation(_shaderProgID, "u_matSpecular");
_matEmissiveLoc = gl.GetUniformLocation(_shaderProgID, "u_matEmissive");
_matShininessLoc = gl.GetUniformLocation(_shaderProgID, "u_matShininess");
_texture0Loc = gl.GetUniformLocation(_shaderProgID, "u_texture0");
// Set some OpenGL states
gl.ClearColor(0.0f, 0.0f, 0.0f, 1); // Set the background color
gl.Enable(EnableCap.DepthTest); // Enables depth test
gl.Enable(EnableCap.CullFace); // Enables the culling of back faces
// Attach mouse wheel handler
Mouse.WheelChanged += new EventHandler <OpenTK.Input.MouseWheelEventArgs>(Mouse_WheelChanged);
glUtils.GetGLError("OnLoad", true);
}
/// <summary>
/// The forms paint routine where all drawing happens.
/// </summary>
private void frmHelloCube_Paint(object sender, PaintEventArgs e)
{
// start with identity every frame
m_modelViewMatrix.Identity();
// view transform: move the coordinate system away from the camera
m_modelViewMatrix.Translate(0, 0, m_camZ);
// model transform: rotate the coordinate system increasingly
m_modelViewMatrix.Rotate(m_rotx + m_dx, 1, 0, 0);
m_modelViewMatrix.Rotate(m_roty + m_dy, 0, 1, 0);
// build combined matrix out of viewport, projection & modelview matrix
SLMat4f m = new SLMat4f();
m.Multiply(m_viewportMatrix);
m.Multiply(m_projectionMatrix);
m.Multiply(m_modelViewMatrix);
// transform all vertices into screen space (x & y in pixels and z as the depth)
SLVec3f[] v2 = new SLVec3f[8];
for (int i = 0; i < m_v.Count(); ++i)
{
v2[i] = m.Multiply(m_v[i]);
}
SLVec3f nZ = new SLVec3f(0, 0, 1);
// Calculate the cubes plane normals in screen space
// Be aware that y is inverse due to MS top-left zero coord.
SLVec3f nN = (v2[1] - v2[0]).cross(v2[0] - v2[3]);
SLVec3f nF = (v2[5] - v2[4]).cross(v2[7] - v2[4]);
SLVec3f nL = (v2[4] - v2[0]).cross(v2[3] - v2[0]);
SLVec3f nR = (v2[5] - v2[1]).cross(v2[1] - v2[2]);
SLVec3f nT = (v2[7] - v2[3]).cross(v2[2] - v2[3]);
SLVec3f nB = (v2[4] - v2[0]).cross(v2[0] - v2[1]);
bool visibleN = nN.dot(nZ) >= 0; //near
bool visibleF = nF.dot(nZ) >= 0; //far
bool visibleL = nL.dot(nZ) >= 0; //left
bool visibleR = nR.dot(nZ) >= 0; //right
bool visibleT = nT.dot(nZ) >= 0; //top
bool visibleB = nB.dot(nZ) >= 0; //bottom
Graphics g = e.Graphics;
g.SmoothingMode = SmoothingMode.AntiAlias;
// draw front square
if (visibleN)
{
g.DrawLine(Pens.Red, v2[0].x, v2[0].y, v2[1].x, v2[1].y);
g.DrawLine(Pens.Red, v2[1].x, v2[1].y, v2[2].x, v2[2].y);
g.DrawLine(Pens.Red, v2[2].x, v2[2].y, v2[3].x, v2[3].y);
g.DrawLine(Pens.Red, v2[3].x, v2[3].y, v2[0].x, v2[0].y);
}
// draw back square
if (visibleF)
{
g.DrawLine(Pens.Green, v2[4].x, v2[4].y, v2[5].x, v2[5].y);
g.DrawLine(Pens.Green, v2[5].x, v2[5].y, v2[6].x, v2[6].y);
g.DrawLine(Pens.Green, v2[6].x, v2[6].y, v2[7].x, v2[7].y);
g.DrawLine(Pens.Green, v2[7].x, v2[7].y, v2[4].x, v2[4].y);
}
// draw left square
if (visibleL)
{
g.DrawLine(Pens.Blue, v2[0].x, v2[0].y, v2[4].x, v2[4].y);
g.DrawLine(Pens.Blue, v2[3].x, v2[3].y, v2[7].x, v2[7].y);
g.DrawLine(Pens.Red, v2[3].x, v2[3].y, v2[0].x, v2[0].y);
g.DrawLine(Pens.Green, v2[7].x, v2[7].y, v2[4].x, v2[4].y);
}
// draw right square
if (visibleR)
{
g.DrawLine(Pens.Blue, v2[1].x, v2[1].y, v2[5].x, v2[5].y);
g.DrawLine(Pens.Blue, v2[2].x, v2[2].y, v2[6].x, v2[6].y);
g.DrawLine(Pens.Red, v2[1].x, v2[1].y, v2[2].x, v2[2].y);
g.DrawLine(Pens.Green, v2[6].x, v2[6].y, v2[5].x, v2[5].y);
}
// draw top square
if (visibleT)
{
g.DrawLine(Pens.Blue, v2[2].x, v2[2].y, v2[6].x, v2[6].y);
g.DrawLine(Pens.Blue, v2[3].x, v2[3].y, v2[7].x, v2[7].y);
g.DrawLine(Pens.Red, v2[3].x, v2[3].y, v2[2].x, v2[2].y);
g.DrawLine(Pens.Green, v2[6].x, v2[6].y, v2[7].x, v2[7].y);
}
// draw bottom square
if (visibleB)
{
g.DrawLine(Pens.Blue, v2[0].x, v2[0].y, v2[4].x, v2[4].y);
g.DrawLine(Pens.Blue, v2[1].x, v2[1].y, v2[5].x, v2[5].y);
g.DrawLine(Pens.Red, v2[0].x, v2[0].y, v2[1].x, v2[1].y);
g.DrawLine(Pens.Green, v2[4].x, v2[4].y, v2[5].x, v2[5].y);
}
// Tell the system that the window should be repaint again
this.Invalidate();
}
/// <summary>
/// The forms paint routine where all drawing happens.
/// </summary>
private void frmHelloCube_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
#region graphicsSetup
g.SmoothingMode = SmoothingMode.AntiAlias;
e.Graphics.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceCopy;
e.Graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighSpeed;
e.Graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor;
e.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighSpeed;
#endregion
addFps();
zBuffer.Reset();
#region cameraMovement
// start with identity every frame
m_viewMatrix.Identity();
// view transform: move the coordinate system away from the camera
m_viewMatrix.Translate(m_cam);
// add new Rotations for camera
m_viewMatrix.Rotate(m_rotAngleUp + (cursorPosition.y - preCursorPosition.y), new SLVec3f(1, 0, 0));
m_viewMatrix.Rotate(m_rotAngleSide + (cursorPosition.x - preCursorPosition.x), new SLVec3f(0, 1, 0));
#endregion
using (BmpG bmpGraphics = new BmpG(ClientRectangle.Width, ClientRectangle.Height, zBuffer, light))
{
#region graphicsMode
bmpGraphics.phong = phongActive;
bmpGraphics.wireframe = xWireframeActive;
bmpGraphics.showZ = zShowActive;
#endregion
foreach (Mesh mesh in meshes)
{
// all transformed vertecies of the mesh are temporary saved in vertex2
List <SLVertex> vertex2 = new List <SLVertex>();
// Vertex Shader
#region transformPipeline
SLMat4f mv = new SLMat4f(m_viewMatrix);
mv.Multiply(mesh.modelMatrix);
SLMat3f nm = new SLMat3f(mv.InverseTransposed());
// build combined matrix out of viewport, projection & modelview matrix
SLMat4f mvp = new SLMat4f();
mvp.Multiply(m_viewportMatrix); // screen
mvp.Multiply(m_projectionMatrix); // projektion
mvp.Multiply(mv); // kamera & view (cube)
for (int n = 0; n < mesh.vertices.Length; n++)
{
vertex2.Add(new SLVertex(mvp.Multiply(mesh.vertices[n].position),
nm.Multiply(mesh.vertices[n].normale),
mesh.color,
mv.Multiply(mesh.vertices[n].position)));
}
#endregion
// Fragment Shader
drawVertices(vertex2, mesh.indices, m_cam, bmpGraphics);
}
// Pixel output
g.DrawImageUnscaled(bmpGraphics.Result(), 0, 0);
}
// Tell the system that the window should be repaint again
this.Invalidate();
}