cubemaps? realtime? Here we go!
Entry posted by klepto2 ·
3,752 views
Hi folks,
while working on my other projects I have started to research why the cubemapping doesn't seem to work in Leadwerks in Realtime.
I have debugged through the code ( I was using Blitzmax to have access to the full debug output and fields of textures and buffers) and found out that
it seems you can't create a real Leadwerks buffer for Cubemaps, I have also investigated TylerH' s early approach after the CreateCubemap command was added and from my experience with miniB3D extended I came to the conclusion that something must be wrong in Joshs solution and handling for realtime cubemaps.
In Tylers lua sample he creates 6 buffers for each side of the cubemap, which is not needed when using fbo (Framebuffer objects). With this in mind I have
integrated my old fbo code from 'miniB3D extended' and stripped it down to just support cubemaps and fit it (maybe a bit messy) into the existing buffer system (no I have no source license). The first result was promising and so i was extending my sample to handle full cubemaps and i was amazed how fast the result was.
This is the result:
The real fps without recording is double as high as it is showing in the video.
Here is my code:
' ====================================================================
' This file was generated by Leadwerks C++/LEO/BlitzMax Project Wizard
' Written by Rimfrost Software
' http://www.rimfrost.com
' ====================================================================
SuperStrict
Framework leadwerks.ENGINE
Local world:TWorld
Local gbuffer:TBuffer
Local camera:TCamera
Local mesh:TMesh
Local light:TLight
Local ground:TMesh
Local material:TMaterial
Local materialfloor:TMaterial
'GCSetMode(2)
RegisterAbstractPath( "D:/LESDK232r5/" )
Graphics(800,600)
world=CreateWorld()
If Not world RuntimeError "Failed to create world."
gbuffer=CreateBuffer(GraphicsWidth(),GraphicsHeight(),BUFFER_DEPTH|BUFFER_COLOR0|BUFFER_COLOR1|BUFFER_COLOR2)
camera=CreateCamera()
PositionEntity camera,[0.0,0.0,-4.0]
material=LoadMaterial("abstract::cubemap.mat")
materialfloor = LoadMaterial("abstract::cobblestones.mat")
mesh = CreateSphere(32)
ScaleEntity mesh,[2.0,2.0,2.0]
PaintEntity mesh,material
light=CreateDirectionalLight()
RotateEntity light , [45.0 , 45.0 , 45.0]
Local cubemap:TTexture = CreateCubemap(512 , 512)
Local cubemapbuffer:TBuffer = CreateBuffer(512 , 512)
SetColorBuffer(cubemapbuffer , cubemap , 0)
Local cubebuffer:TCubeBuffer = TCubeBuffer.Create(cubemap,cubemapbuffer)
SetMaterialTexture( material , cubemap , 0)
Local p:TPivot = CreatePivot()
Local sp:TMesh = CreateSphere(16,p)
MoveEntity sp , [4.0 , 0.0 , 0.0]
EntityColor sp,[1.0,0.0,0.0,1.0]
Local p1:TPivot = CreatePivot()
Local sp1:TMesh = CreateSphere(16,p1)
MoveEntity sp1 , [4.0 , 0.0 , 0.0]
EntityColor sp1,[0.0,1.0,0.0,1.0]
Local p2:TPivot = CreatePivot()
Local sp2:TMesh = CreateSphere(16,p2)
MoveEntity sp2 , [4.0 , 0.0 , 0.0]
EntityColor sp2,[0.0,0.0,1.0,1.0]
Local skybox:TMEsh = CreateCube()
ScaleMesh skybox , [4.0 , 4.0 , 4.0]
FlipMesh skybox
EntityShadowMode skybox,0
PaintEntity skybox,LoadMaterial("abstract::FullskiesBlueClear0016_2_L.mat")
EntityColor skybox,[1.0,1.0,1.0,1.0]
Local frame:Int = 0
Repeat
TurnEntity p , [0.0 , AppSpeed() * .5 , 0.0]
TurnEntity p1, [0.0,-AppSpeed()*.5,0.0]
TurnEntity p2, [0.0,0.0,AppSpeed()*.5]
If KeyHit(KEY_ESCAPE) Exit
If AppTerminate() Exit
UpdateAppTime()
UpdateWorld(AppSpeed())
SetBuffer(cubemapbuffer)
PositionEntity camera , [0.0 , 0.0 , 0.0]
ScaleEntity camera,[1.0 , -1.0 , 1.0]
HideEntity mesh
Local stage:Int = frame Mod 6
If stage = 0 Then
cubebuffer.Set(0)
RotateEntity camera,[0.0 , -90.0 , 0.0]
RenderWorld()
Else If stage = 1 Then
cubebuffer.Set(1)
RotateEntity camera,[0.0 , 90.0 , 0.0]
RenderWorld()
Else If stage = 2 Then
cubebuffer.Set(2)
RotateEntity camera,[-90.0 , 0.0 , 0.0]
RenderWorld()
Else If stage = 3 Then
cubebuffer.Set(3)
RotateEntity camera,[90.0 , 0.0 , 0.0]
RenderWorld()
Else If stage = 4 Then
cubebuffer.Set(4)
RotateEntity camera,[0.0 , 0.0 , 0.0 ]
RenderWorld()
Else If stage = 5 Then
cubebuffer.Set(5)
RotateEntity camera,[0.0 , -180.0 , 0.0]
RenderWorld()
End If
cubebuffer.UnSet()
ScaleEntity camera,[1.0 , 1.0 , 1.0]
RotateEntity camera,[0.0 , 0.0 , 0.0]
PositionEntity camera , [0.0 , 0.0 , - 4.0]
ShowEntity mesh
SetBuffer(gbuffer)
RenderWorld()
SetBuffer(BackBuffer())
RenderLights(gbuffer)
SetBlend BLEND_ALPHA
DrawText(UPS(),0,0)
SetBlend 0
Flip(0)
frame:+1
GCCollect()
Forever
gbuffer=Null
FreeEntity light
GCCollect()
End
Type TCubeBuffer
Field texture:TTexture
Field buffer:TBuffer
Field rb:Int[1]
Field fb:Int[1]
Field sb:Int[1]
Field db:Int[1]
Function Create:TCubeBuffer(texture:TTexture,buffer:TBuffer)
Local cb:TCubeBuffer = New TCubeBuffer
cb.Texture = texture
cb.Buffer = buffer
cb._BuildBuffer()
cb.Buffer.Framebuffer = cb.fb[0]
cb.Buffer.colorbuffer[0] = texture
Return cb
End Function
Method _BuildBuffer()
Local w:Int =texture.reference._Width
Local h:Int = texture.reference._Height
glBindTexture(GL_TEXTURE_CUBE_MAP , texture.reference._index)
glTexImage2D GL_TEXTURE_CUBE_MAP_NEGATIVE_X,0,GL_RGBA8 ,w,h,0,GL_RGBA,GL_UNSIGNED_BYTE,Null
glTexImage2D GL_TEXTURE_CUBE_MAP_POSITIVE_Z,0,GL_RGBA8 ,w,h,0,GL_RGBA,GL_UNSIGNED_BYTE,Null
glTexImage2D GL_TEXTURE_CUBE_MAP_POSITIVE_X,0,GL_RGBA8 ,w,h,0,GL_RGBA,GL_UNSIGNED_BYTE,Null
glTexImage2D GL_TEXTURE_CUBE_MAP_NEGATIVE_Z,0,GL_RGBA8 ,w,h,0,GL_RGBA,GL_UNSIGNED_BYTE,Null
glTexImage2D GL_TEXTURE_CUBE_MAP_POSITIVE_Y,0,GL_RGBA8 ,w,h,0,GL_RGBA,GL_UNSIGNED_BYTE,Null
glTexImage2D GL_TEXTURE_CUBE_MAP_NEGATIVE_Y , 0 , GL_RGBA8 , w , h , 0 , GL_RGBA , GL_UNSIGNED_BYTE , Null
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP , GL_TEXTURE_WRAP_T , GL_CLAMP_TO_EDGE) ;
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP , GL_TEXTURE_MIN_FILTER , GL_LINEAR) ;
glGenFramebuffersEXT(1, fb )
glGenRenderbuffersEXT(1 , rb)
glGenRenderbuffersEXT(1 , sb)
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT , fb[0]) ;
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT , GL_COLOR_ATTACHMENT0_EXT , GL_TEXTURE_CUBE_MAP , texture.reference._index, 0) ;
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT , rb[0]) ;
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT24 ,W, H);
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT , GL_DEPTH_ATTACHMENT_EXT , GL_RENDERBUFFER_EXT , rb[0])
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT , 0)
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT , 0) ;
End Method
Method Set(cubeface:Int)
'glBindFramebufferEXT(GL_FRAMEBUFFER_EXT , fb[0])
SetBuffer(buffer)
Select cubeface
Case 0 glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT , GL_COLOR_ATTACHMENT0_EXT ,GL_TEXTURE_CUBE_MAP_POSITIVE_X,texture.reference._index,0)
Case 1 glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT , GL_COLOR_ATTACHMENT0_EXT ,GL_TEXTURE_CUBE_MAP_NEGATIVE_X,texture.reference._index,0)
Case 2 glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT , GL_COLOR_ATTACHMENT0_EXT ,GL_TEXTURE_CUBE_MAP_POSITIVE_Y,texture.reference._index,0)
Case 3 glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT , GL_COLOR_ATTACHMENT0_EXT ,GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,texture.reference._index,0)
Case 4 glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT , GL_COLOR_ATTACHMENT0_EXT ,GL_TEXTURE_CUBE_MAP_POSITIVE_Z,texture.reference._index,0)
Case 5 glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT , GL_COLOR_ATTACHMENT0_EXT ,GL_TEXTURE_CUBE_MAP_NEGATIVE_Z,texture.reference._index,0)
End Select
'glgetError()
End Method
Method Unset()
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT , 0)
End Method
Method CheckFBOStatus:Int(index:Int = 0)
Local status:Int = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT)
Select status
Case GL_FRAMEBUFFER_COMPLETE_EXT
Print index + ": FBO Complete"
Case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT
Print index + ": Incomplete attachment"
Case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT
Print index + ": Missing attachment"
Case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT
Print index + ": Incomplete dimensions"
Case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT
Print index + ": Incomplete formats"
Case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT
Print index + ": Incomplete draw buffer"
Case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT
Print index + ": Incomplete read buffer"
Case GL_FRAMEBUFFER_UNSUPPORTED_EXT
Print index + ": Framebufferobjects unsupported"
EndSelect
Return Status
End Method
End Type
One downside is that currently I get INVALID_ENUM error in debug mode, but I have no idea why as it is thrown from engine itself. Also this is unfortunatly a Blitzmax only hack as it needs some access to some not provided fields. But maybe Josh can use this code to finally integrate proper support of realtime cubemapping into the engine.
thx for reading
klepto2
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