forked from iand/amberfell
/
viewport.go
307 lines (253 loc) · 9.89 KB
/
viewport.go
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/*
To the extent possible under law, Ian Davis has waived all copyright
and related or neighboring rights to this Amberfell Source Code file.
This work is published from the United Kingdom.
*/
package main
import (
"fmt"
"github.com/banthar/Go-SDL/sdl"
"github.com/banthar/gl"
"math"
)
type Viewport struct {
rotx float64
roty float64
rotz float64
scale float64
screenWidth int
screenHeight int
mousex int
mousey int
selectionDirty bool
selectedBlockFace *BlockFace
lplane, rplane float64
bplane, tplane float64
near, far float64
viewRadius int16
}
func NewViewport() *Viewport {
vp := &Viewport{}
vp.viewRadius = 30
vp.Zoomstd()
vp.Rotx(25)
vp.Roty(70)
return vp
}
/* new window size or exposure */
func (self *Viewport) Reshape(width int, height int) {
self.selectionDirty = false
self.screenWidth = width
self.screenHeight = height
gl.Viewport(0, 0, width, height)
viewWidth := float64(self.screenWidth) / float64(SCREEN_SCALE)
viewHeight := float64(self.screenHeight) / float64(SCREEN_SCALE)
self.lplane = -viewWidth / 2
self.rplane = viewWidth / 2
self.bplane = -viewHeight / 4
self.tplane = 3 * viewHeight / 4
gl.MatrixMode(gl.PROJECTION)
gl.LoadIdentity()
gl.Ortho(self.lplane, self.rplane, self.bplane, self.tplane, -60, 60)
// self.Perspective(90, 1, 0.01,1000);
gl.MatrixMode(gl.MODELVIEW)
gl.LoadIdentity()
picker.x = float32(viewport.rplane) - picker.radius + BLOCK_SCALE*0.5
picker.y = float32(viewport.bplane) + picker.radius - BLOCK_SCALE*0.5
}
func (self *Viewport) Perspective(fovy, aspect, zNear, zFar float64) {
gl.MatrixMode(gl.PROJECTION)
gl.LoadIdentity()
var xmin, xmax, ymin, ymax float64
ymax = zNear * math.Tan(fovy*math.Pi/360.0)
ymin = -ymax
xmin = ymin * aspect
xmax = ymax * aspect
gl.Frustum(xmin, xmax, ymin, ymax, zNear, zFar)
gl.MatrixMode(gl.MODELVIEW)
gl.Hint(gl.PERSPECTIVE_CORRECTION_HINT, gl.NICEST)
gl.DepthMask(true)
}
func (self *Viewport) Rotx(angle float64) {
self.selectionDirty = false
self.rotx += angle
if self.rotx > 75 {
self.rotx = 75
} else if self.rotx < 5 {
self.rotx = 5
}
// self.Recalc()
}
func (self *Viewport) Roty(angle float64) {
self.selectionDirty = false
self.roty += angle
// self.Recalc()
}
func (self *Viewport) Rotz(angle float64) {
self.selectionDirty = false
self.rotz += angle
// self.Recalc()
}
func (self *Viewport) Zoomstd() {
self.selectionDirty = false
self.scale = 0.8
}
func (self *Viewport) Zoomin() {
self.selectionDirty = false
self.scale += 0.1
if self.scale > 3 {
self.scale = 3
}
// self.Recalc()
}
func (self *Viewport) Zoomout() {
self.selectionDirty = false
self.scale -= 0.1
if self.scale < 0.2 {
self.scale = 0.2
}
// self.Recalc()
}
func ModelMatrix() *Matrix4 {
return NewIdentity().Scale(viewport.scale).Rotatex(viewport.rotx).Rotatey(viewport.roty-ThePlayer.Heading()).Rotatez(viewport.rotz).Translation(-ThePlayer.position[XAXIS], -ThePlayer.position[YAXIS], -ThePlayer.position[ZAXIS])
}
func (self *Viewport) ProjectPoint(p *Vectorf) (point *Vectorf, normal *Vectorf) {
var pm32 []float32 = make([]float32, 16)
gl.GetFloatv(gl.PROJECTION_MATRIX, pm32)
var projectionMatrix64 *Matrix4 = NewMatrix(float64(pm32[0]), float64(pm32[1]), float64(pm32[2]), float64(pm32[3]), float64(pm32[4]), float64(pm32[5]), float64(pm32[6]), float64(pm32[7]), float64(pm32[8]), float64(pm32[9]), float64(pm32[10]), float64(pm32[11]), float64(pm32[12]), float64(pm32[13]), float64(pm32[14]), float64(pm32[15]))
inverseMatrix, _ := projectionMatrix64.Multiply(ModelMatrix()).Inverse()
point = inverseMatrix.Transform(p, 1)
normalv := inverseMatrix.Transform(&Vectorf{0, 0, 1}, 0).Normalize()
return point, &normalv
}
func (self *Viewport) ClipPlanes() *[6][4]float32 {
var pm32 []float64 = make([]float64, 16)
gl.GetDoublev(gl.PROJECTION_MATRIX, pm32)
var projectionMatrix64 *Matrix4 = NewMatrix(pm32[0], pm32[1], pm32[2], pm32[3], pm32[4], pm32[5], pm32[6], pm32[7], pm32[8], pm32[9], pm32[10], pm32[11], pm32[12], pm32[13], pm32[14], pm32[15])
mvpmatrix := projectionMatrix64.Multiply(ModelMatrix())
// mvpmatrix := ModelMatrix()
planes64 := [6][4]float64{
{mvpmatrix[3] + mvpmatrix[0], mvpmatrix[7] + mvpmatrix[4], mvpmatrix[11] + mvpmatrix[8], mvpmatrix[15] + mvpmatrix[12]},
{mvpmatrix[3] - mvpmatrix[0], mvpmatrix[7] - mvpmatrix[4], mvpmatrix[11] - mvpmatrix[8], mvpmatrix[15] - mvpmatrix[12]},
{mvpmatrix[3] + mvpmatrix[1], mvpmatrix[7] + mvpmatrix[5], mvpmatrix[11] + mvpmatrix[9], mvpmatrix[15] + mvpmatrix[13]},
{mvpmatrix[3] - mvpmatrix[1], mvpmatrix[7] - mvpmatrix[5], mvpmatrix[11] - mvpmatrix[9], mvpmatrix[15] - mvpmatrix[13]},
{mvpmatrix[3] + mvpmatrix[2], mvpmatrix[7] + mvpmatrix[6], mvpmatrix[11] + mvpmatrix[10], mvpmatrix[15] + mvpmatrix[14]},
{mvpmatrix[3] - mvpmatrix[2], mvpmatrix[7] - mvpmatrix[6], mvpmatrix[11] - mvpmatrix[10], mvpmatrix[15] - mvpmatrix[14]},
}
var planes32 [6][4]float32
for p := 0; p < 6; p++ {
length := math.Sqrt(math.Pow(planes64[p][0], 2) + math.Pow(planes64[p][1], 2) + math.Pow(planes64[p][2], 2) + math.Pow(planes64[p][3], 2))
planes32[p] = [4]float32{float32(planes64[p][0] / length), float32(planes64[p][1] / length), float32(planes64[p][2] / length), float32(planes64[p][3] / length)}
}
return &planes32
}
func (self *Viewport) SelectedBlockFace() *BlockFace {
var newmousex, newmousey int
_ = sdl.GetMouseState(&newmousex, &newmousey)
self.selectedBlockFace = nil
self.mousex = newmousex
self.mousey = newmousey
x := (float64(self.mousex) - float64(self.screenWidth)/2) / (float64(self.screenWidth) / 2)
z := (float64(self.screenHeight)/2 - float64(self.mousey)) / (float64(self.screenHeight) / 2)
origin, norm := self.ProjectPoint(&Vectorf{x, z, -1})
if origin != nil {
pos := IntPosition(ThePlayer.position)
ray := Ray{origin, norm}
// See http://www.dyn-lab.com/articles/pick-selection.html
var box *Box = nil
distance := float64(1e9)
face := uint8(0)
for dy := int16(PLAYER_REACH); dy > -(PLAYER_REACH + 1); dy-- {
for dz := -int16(PLAYER_REACH); dz < PLAYER_REACH+1; dz++ {
for dx := -int16(PLAYER_REACH); dx < PLAYER_REACH+1; dx++ {
if dy*dy+dz*dz+dx*dx <= PLAYER_REACH*PLAYER_REACH {
blockDirection := Vectorf{float64(dx), float64(dy), float64(dz)}
if /* ThePlayer.Facing(blockDirection) && */ blockDirection.Magnitude() <= float64(PLAYER_REACH) {
posTest := pos.Translate(dx, dy, dz)
trialDistance := math.Sqrt(math.Pow(float64(posTest[XAXIS])-origin[0], 2) + math.Pow(float64(posTest[YAXIS])-origin[1], 2) + math.Pow(float64(posTest[ZAXIS])-origin[2], 2))
if trialDistance < distance {
if TheWorld.Atv(posTest) != BLOCK_AIR {
trialBox := &Box{
&Vectorf{float64(posTest[XAXIS]) - 0.5, float64(posTest[YAXIS]) - 0.5, float64(posTest[ZAXIS]) - 0.5},
&Vectorf{float64(posTest[XAXIS]) + 0.5, float64(posTest[YAXIS]) + 0.5, float64(posTest[ZAXIS]) + 0.5}}
hit, trialFace := ray.HitsBox(trialBox)
if hit {
distance = trialDistance
box = trialBox
face = trialFace
}
}
}
}
}
}
}
}
if box != nil {
self.selectedBlockFace = &BlockFace{pos: Vectori{uint16(box.min[XAXIS] + 0.5), uint16(box.min[YAXIS] + 0.5), uint16(box.min[ZAXIS] + 0.5)}, face: face}
self.selectionDirty = false
}
}
// }
return self.selectedBlockFace
}
func (self *Viewport) HandleKeys(keys []uint8) {
if keys[sdl.K_UP] != 0 {
if keys[sdl.K_LCTRL] != 0 || keys[sdl.K_RCTRL] != 0 {
self.Zoomin()
} else {
self.Rotx(5)
}
}
if keys[sdl.K_DOWN] != 0 {
if keys[sdl.K_LCTRL] != 0 || keys[sdl.K_RCTRL] != 0 {
self.Zoomout()
} else {
self.Rotx(-5)
}
}
if keys[sdl.K_LEFT] != 0 {
if keys[sdl.K_LCTRL] != 0 || keys[sdl.K_RCTRL] != 0 {
self.viewRadius -= 4
if self.viewRadius < 8 {
self.viewRadius = 8
}
} else {
self.Roty(9)
}
}
if keys[sdl.K_RIGHT] != 0 {
if keys[sdl.K_LCTRL] != 0 || keys[sdl.K_RCTRL] != 0 {
self.viewRadius += 4
} else {
self.Roty(-9)
}
}
if keys[sdl.K_SLASH] != 0 {
var pm32 []float64 = make([]float64, 16)
gl.GetDoublev(gl.PROJECTION_MATRIX, pm32)
var projectionMatrix64 *Matrix4 = NewMatrix(pm32[0], pm32[1], pm32[2], pm32[3], pm32[4], pm32[5], pm32[6], pm32[7], pm32[8], pm32[9], pm32[10], pm32[11], pm32[12], pm32[13], pm32[14], pm32[15])
mvpmatrix := projectionMatrix64.Multiply(ModelMatrix())
// mvpmatrix := ModelMatrix()
planes64 := [6][4]float64{
{mvpmatrix[3] + mvpmatrix[0], mvpmatrix[7] + mvpmatrix[4], mvpmatrix[11] + mvpmatrix[8], mvpmatrix[15] + mvpmatrix[12]},
{mvpmatrix[3] - mvpmatrix[0], mvpmatrix[7] - mvpmatrix[4], mvpmatrix[11] - mvpmatrix[8], mvpmatrix[15] - mvpmatrix[12]},
{mvpmatrix[3] + mvpmatrix[1], mvpmatrix[7] + mvpmatrix[5], mvpmatrix[11] + mvpmatrix[9], mvpmatrix[15] + mvpmatrix[13]},
{mvpmatrix[3] - mvpmatrix[1], mvpmatrix[7] - mvpmatrix[5], mvpmatrix[11] - mvpmatrix[9], mvpmatrix[15] - mvpmatrix[13]},
{mvpmatrix[3] + mvpmatrix[2], mvpmatrix[7] + mvpmatrix[6], mvpmatrix[11] + mvpmatrix[10], mvpmatrix[15] + mvpmatrix[14]},
{mvpmatrix[3] - mvpmatrix[2], mvpmatrix[7] - mvpmatrix[6], mvpmatrix[11] - mvpmatrix[10], mvpmatrix[15] - mvpmatrix[14]},
}
var planes32 [6][4]float32
for p := 0; p < 6; p++ {
length := math.Sqrt(math.Pow(planes64[p][0], 2) + math.Pow(planes64[p][1], 2) + math.Pow(planes64[p][2], 2) + math.Pow(planes64[p][3], 2))
fmt.Printf("Length: %d: %0.2f\n", p, length)
planes32[p] = [4]float32{float32(planes64[p][0] / length), float32(planes64[p][1] / length), float32(planes64[p][2] / length), float32(planes64[p][3] / length)}
fmt.Printf("Plane: %d: [%0.6f, %0.6f, %0.6f, %0.6f]\n", p, planes32[p][0], planes32[p][1], planes32[p][2], planes32[p][3])
}
}
}
func (self *Viewport) ScreenCoordsToWorld2D(sx, sy uint16) (x, y float64) {
x = (float64(self.lplane) + float64(sx)*PIXEL_SCALE)
y = (float64(self.tplane) - float64(sy)*PIXEL_SCALE)
return
}