/// <summary>
/// Calls DrawPolygon for the vertecies with the same indices
/// backface culling calculations
/// </summary>
/// <param name="v">vertecies</param>
/// <param name="index">indecies</param>
/// <param name="cam">camera for backfaceculling</param>
/// <param name="bmp">bitmap to draw on</param>
private void drawVertices(List <SLVertex> v, int[] index, SLVec3f cam, BmpG bmp)
{
for (int i = 0; i < index.Length; i += 3)
{
if (backfaceCulling(v[index[i]],
v[index[i + 1]],
v[index[i + 2]],
cam))
{
bmp.DrawPolygon(v[index[i]],
v[index[i + 1]],
v[index[i + 2]]);
}
}
}
/// <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();
}