func getLookAtMatrix() gls.Mat4 {
lookDir := latpt.Copy()
lookDir.Minus(getCamPos())
lookDir.Normalize()
updir.Normalize()
rightDir := gls.Cross(lookDir, updir)
rightDir.Normalize()
perpUpDir := gls.Cross(rightDir, lookDir)
rotMat := gls.Identity()
rotMat.SetCol(0, gls.NewVec4(rightDir, 0))
rotMat.SetCol(1, gls.NewVec4(perpUpDir, 0))
rotMat.SetCol(2, gls.NewVec4(lookDir.Neg(), 0))
/*log.Println("updir: ", updir)
log.Println("rightdir: ", rightDir)
log.Println("perpupdir: ",perpUpDir)
log.Println("lookdir: ", lookDir)
log.Println(rotMat)
*/
rotMat.Transpose()
//log.Println(rotMat)
transMat := gls.Identity()
camPos := getCamPos()
transMat.SetCol(3, gls.NewVec4(camPos.Neg(), 1))
//log.Println(transMat)
if true {
return rotMat.Times(transMat)
}
//transMat = gls.Identity()
return transMat
}
func display() {
gl.ClearColor(0.19, 0.19, 0.21, 0)
gl.ClearDepth(1)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.UseProgram(theProgram)
// Temporarily set the cam t clip
id := gls.Identity()
trans := getLookAtMatrix()
// log.Println(trans)
gls.UniformMatrix4fv(wtcm_unif, 1, false, trans)
gls.UniformMatrix4fv(mtwm_unif, 1, false, id)
// And here we do the actual rendering
// Generate a name for vufferobj and store it
gl.GenBuffers(1, &positionBufferObject)
// Bind it to a target
gl.BindBuffer(gl.ARRAY_BUFFER, positionBufferObject)
// Conver all nodes to a long array of vertexes!
i := 0
// TODO: Fix this, based on 4 per eleemnts
vpos := make([]float32, len(elements)*4*4)
elms := make(map[uint32]mS, len(elements))
// Note that the order here is undefined!
ii := 0
for k, v := range elements {
elms[k] = mS{ii, len(v.Nodes())}
for _, vv := range v.Nodes() {
ii++
vpos[i] = float32(nodes[vv][0])
i++
vpos[i] = float32(nodes[vv][1])
i++
vpos[i] = float32(nodes[vv][2])
i++
vpos[i] = 1.0
i++
}
}
/*
for _, v := range nodes {
vpos[i] = float32(v[0])
i++
vpos[i] = float32(v[1])
i++
vpos[i] = float32(v[2])
i++
}
*/
gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(32/8*len(vpos)), (gl.Pointer)(&vpos[0]), gl.STATIC_DRAW)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, positionBufferObject)
gl.EnableVertexAttribArray(0)
gl.VertexAttribPointer(0, 4, gl.FLOAT, gl.FALSE, 0, (gl.Pointer)(nil))
/* for _,v := range elms {
}
*/
for _, v := range elms {
gl.DrawArrays(gl.LINE_LOOP, gl.Int(v.Start), gl.Sizei(v.Length))
}
// Draw Coordinate acis
/*for i := 9; i < 9+2*5; i += 2 {
gl.DrawArrays(gl.LINE_STRIP, gl.Int(i), 2)
}*/
}