func (this *World) PortalTransform(pos1, pos2 mgl.Vec4) mgl.Mat4 {
portal := this.NearestPortal(pos1)
m := portal.View()
pos1 = m.Mul4x1(pos1)
pos2 = m.Mul4x1(pos2)
n := portal.Normal
a := n.Dot(pos1)
b := n.Dot(pos2)
var portalPassed bool
if a*b < 0 {
c := a / (a - b)
pos3 := pos1.Mul(c).Add(pos2.Mul(1 - c))
portalPassed = -1 < pos3[0] && pos3[0] < 1 && -1 < pos3[1] && pos3[1] < 1
} else {
portalPassed = false
}
if portalPassed {
return portal.Transform()
} else {
return mgl.Ident4()
}
}
func (camera *Camera) MoveRelative(dist mgl.Vec4) {
dist_xyz := dist.Vec3()
v := camera.Orientation.Rotate(dist_xyz)
camera.MoveAbsolute(v.Vec4(0))
}
func (this *WorldRenderer) render(ww *gamestate.World, options *settings.BoolOptions, viewport Viewport, recursion int, srcPortal *gamestate.Portal) {
this.Framebuffer[recursion].Bind()
defer this.Framebuffer[recursion].Unbind()
gl.Clear(gl.DEPTH_BUFFER_BIT)
camera := gamestate.NewCameraFromMat4(this.View)
Rot2D := camera.Rotation2D()
gl.CullFace(gl.BACK)
time := float64(sdl.GetTicks()) / 1000
if options.Wireframe {
gl.PolygonMode(gl.FRONT_AND_BACK, gl.LINE)
} else {
gl.PolygonMode(gl.FRONT_AND_BACK, gl.FILL)
}
if options.Skybox {
gl.Disable(gl.DEPTH_TEST)
this.SkyboxRenderer.Render(this.Skybox, this.Proj, this.View, this.ClippingPlane_ws, nil)
gl.Enable(gl.DEPTH_TEST)
}
gl.Enable(gl.CULL_FACE)
if recursion != 0 {
gl.Enable(gl.CLIP_DISTANCE0)
defer gl.Disable(gl.CLIP_DISTANCE0)
}
for _, entity := range ww.ExampleObjects {
this.MeshRenderer.Render(entity, this.Proj, this.View, this.ClippingPlane_ws, nil)
}
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Disable(gl.CULL_FACE)
if options.WorldRender {
this.HeightMapRenderer.Render(ww.HeightMap, this.Proj, this.View, this.ClippingPlane_ws, nil)
}
PlayerPos := ww.Player.Position()
ww.Water.Height = PlayerPos[2] - 15
if options.WaterRender {
this.WaterRendererA.Render(ww.Water, this.Proj, this.View, this.ClippingPlane_ws, WaterRenderUniforms{time, PlayerPos})
}
if options.WaterNormals {
this.WaterRendererB.Render(ww.Water, this.Proj, this.View, this.ClippingPlane_ws, WaterRenderUniforms{time, PlayerPos})
}
gl.Disable(gl.CULL_FACE)
gl.Disable(gl.BLEND)
if options.TreeRender {
this.TreeRenderer.Render(ww.Trees, this.Proj, this.View, this.ClippingPlane_ws, Rot2D)
}
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE)
if options.ParticleRender {
this.ParticleSystem.Render(this.Proj, this.View, this.ClippingPlane_ws)
}
gl.Disable(gl.BLEND)
boxVertices := (*gamestate.TriangleMesh)(gamestate.QuadMesh()).MakeBoxVertices()
pv := this.Proj.Mul4(this.View)
// calculating nearest portal
pos4f := this.View.Inv().Mul4x1(mgl.Vec4{0, 0, 0, 1})
nearestPortal := ww.NearestPortal(pos4f)
// draw all portals except the nearest and the portal that we are looking throug
for _, portal := range ww.Portals {
// do not draw the nearest portal or the portal behind the source portal if available
if (nearestPortal != portal) && (srcPortal == nil || srcPortal.Target != portal) {
gl.Enable(gl.DEPTH_CLAMP)
additionalUniforms := map[string]int{"Image": 7}
this.PortalRenderer.Render(portal, this.Proj, this.View, this.ClippingPlane_ws, additionalUniforms)
}
}
gl.Disable(gl.BLEND)
gl.Disable(gl.CULL_FACE)
if options.DebugLines {
if options.DepthTestDebugLines {
gl.Disable(gl.DEPTH_TEST)
}
this.DebugRenderer.Render(this.Proj, this.View)
gl.Enable(gl.DEPTH_TEST)
}
// draw
if recursion < this.MaxRecursion {
portal := nearestPortal
pos := portal.Position
rotation := portal.Orientation.Mat4()
Model := mgl.Translate3D(pos[0], pos[1], pos[2]).Mul4(rotation)
pvm := pv.Mul4(Model)
meshMin := mgl.Vec4{math.MaxFloat32, math.MaxFloat32, math.MaxFloat32, math.MaxFloat32}
meshMax := mgl.Vec4{-math.MaxFloat32, -math.MaxFloat32, -math.MaxFloat32, -math.MaxFloat32}
for _, v := range boxVertices {
v = pvm.Mul4x1(v)
v = v.Mul(1 / v[3])
meshMin = gamestate.Min(meshMin, v)
meshMax = gamestate.Max(meshMax, v)
}
// at least partially visible
if -1 < meshMax[0] && meshMin[0] < 1 &&
-1 < meshMax[1] && meshMin[1] < 1 &&
-1 < meshMax[2] && meshMin[2] < 1 {
p1x, p1y := viewport.ToPixel(meshMin.Vec2())
p2x, p2y := viewport.ToPixel(meshMax.Vec2())
pw, ph := p2x-p1x, p2y-p1y
// do scissoring only when all vertices are in front of the camera
scissor := meshMax[2] < 1
scissor = scissor && (p1x != 0 || p1y != 0 || pw != viewport.W-1 || ph != viewport.H-1)
if scissor {
gl.Enable(gl.SCISSOR_TEST)
gl.Scissor(p1x, p1y, pw, ph)
}
// omit rendering when portal is not in frustum at all
// calculation View matrix that shows the target portal from the same angle as view shows the source portal
//pos2 := portal.Target.Position
Model2 := portal.Target.Model()
// model matrix, so that portal 1 in camera 1 looks identical to portal 2 in camera
oldView := this.View
this.View = this.View.Mul4(Model).Mul4(Model2.Inv())
normal_os := portal.Target.Normal
normal_ws := Model.Mul4x1(normal_os)
view_dir := helpers.HomogenDiff(portal.Position, camera.Position)
sign := view_dir.Dot(normal_ws)
oldClippingPlane := this.ClippingPlane_ws
this.ClippingPlane_ws = portal.Target.ClippingPlane(sign > 0)
this.render(ww, options, viewport, recursion+1, nearestPortal)
this.ClippingPlane_ws = oldClippingPlane
this.View = oldView
gl.ActiveTexture(gl.TEXTURE0)
this.Framebuffer[recursion+1].RenderTexture.Bind(gl.TEXTURE_RECTANGLE)
if scissor {
//gl.Scissor(0, 0, w, h)
gl.Disable(gl.SCISSOR_TEST)
}
this.Framebuffer[recursion].Bind()
gl.Enable(gl.DEPTH_CLAMP)
additionalUniforms := map[string]int{"Image": 0}
this.PortalRenderer.Render(nearestPortal, this.Proj, this.View, this.ClippingPlane_ws, additionalUniforms)
}
}
}
func Homogen(v mgl.Vec4) mgl.Vec4 {
return v.Mul(1 / v[3])
}