pixel texture rotation (pixel:setTextureRotation?)

MoKaLux

is it possible to rotate a pixel texture please?

Tiled_Flow = Core.class(Sprite)   function Tiled_Flow:init() local tex = Texture.new("mytex.png", false, {wrap = TextureBase.REPEAT}) self.img = Pixel.new(tex, 64, 64) self:addChild(self.img) self.flowx, self.flowy = 0, 0 self.flowspeedx, self.flowspeedy = 1, 1 self:addEventListener(Event.ENTER_FRAME, self.onEnterFrame, self) end   function Tiled_Flow:onEnterFrame(e) self.flowx += self.flowspeedx or 0 self.flowy += self.flowspeedy or 0 self.img:setTexturePosition(self.flowx, self.flowy) -- this moves the texture on x and y -- is it possible to rotate the texture as well? end

I tried using matrix but couldn't figure it out

MoKaLux

For example I tried this but it doesn't rotate the texture:

Tiled_Flow = Core.class(Sprite)   function Tiled_Flow:init() local tex = Texture.new("mytex.png", false, {wrap = TextureBase.REPEAT}) self.img = Pixel.new(tex, 64, 64) self:addChild(self.img) self.flowx, self.flowy = 0, 0 self.flowspeedx, self.flowspeedy = 1, 1 self.m = Matrix.new() self:addEventListener(Event.ENTER_FRAME, self.onEnterFrame, self) end   function Tiled_Flow:onEnterFrame(e) self.flowx += self.flowspeedx or 0 self.flowy += self.flowspeedy or 0 self.img:setTexturePosition(self.flowx, self.flowy) -- the pixel texture won't rotate :-( self.m:setRotationX(self.flowx * 8) self.img:setTextureMatrix(self.m) end

rrraptor

I guess the only way is to write a shader?
I tried to use lua shaders, but I have no idea how to get/set mat4 elements in vertex shader.
@SinisterSoft can you help with that?)
Or something like that:

local tex = Texture.new("tileTexture.png", true, {wrap = Texture.REPEAT})   local spr = Pixel.new(tex, 512, 512) -- fake texture spr:setAnchorPoint(.5, .5)   local view = Viewport.new() view:setClip(0, 0, 128, 128) view:setContent(spr) stage:addChild(view)   local time = 0 stage:addEventListener("enterFrame", function(e) local dt = e.deltaTime time += dt   spr:setRotation(spr:getRotation() + 50 * dt) spr:setPosition( spr:getX() + math.cos(time) * 100 * dt, spr:getY() + math.sin(time) * 100 * dt ) end)

MoKaLux

thanks a bunch rrraptor, I wanted to add some "quick" effect but this will have to wait until I dive into shaders then
Oh I will also try your Viewport solution

hgy29

MoKaLux said:

For example I tried this but it doesn't rotate the texture:

Tiled_Flow = Core.class(Sprite) -- the pixel texture won't rotate :-( self.m:setRotationX(self.flowx * 8) self.img:setTextureMatrix(self.m)

There are two issues here: first setTextureMatrix doesn't do anything in gideros (I have just looked at the code and the function miss the important part, I have fixed it now). Second issue is that you should call setRotationZ(), not setRotationX()

MoKaLux

I forgot to mention that I did try to rotate on X, Y and Z
Thank you for fixing it (and having updated reactPhysics3d )

hgy29

Here is the same effect using luashaders:

--!NEEDS:luashader/luashader.lua   local function vertexShader(vVertex,vColor,vTexCoord) local vertex = hF4(vVertex,0.0,1.0) fTexCoord=(tMatrix*hF4(vTexCoord,0,1)).xy return vMatrix*vertex end   local function fragmentShader() local frag=lF4(fColor)*texture2D(fTexture, fTexCoord) if (frag.a==0.0) then discard() end return frag end local myTextureShader=Shader.lua(vertexShader,fragmentShader,0, { {name="vMatrix",type=Shader.CMATRIX,sys=Shader.SYS_WVP,vertex=true}, {name="fColor",type=Shader.CFLOAT4,sys=Shader.SYS_COLOR,vertex=false}, {name="fTexture",type=Shader.CTEXTURE,vertex=false}, {name="tMatrix",type=Shader.CMATRIX,vertex=true}, }, { {name="vVertex",type=Shader.DFLOAT,mult=2,slot=0,offset=0}, {name="vColor",type=Shader.DUBYTE,mult=4,slot=1,offset=0}, {name="vTexCoord",type=Shader.DFLOAT,mult=2,slot=2,offset=0}, }, { {name="fTexCoord",type=Shader.CFLOAT2}, } )   local tex = Texture.new("mytex.png", true, {wrap = Texture.REPEAT})   local spr = Pixel.new(tex, 512, 512) -- fake texture spr:setAnchorPoint(.5, .5) spr:setShader(myTextureShader)   stage:addChild(spr) stage:addEventListener("enterFrame", function(e) local mat=Matrix.new() mat:setRotationZ(10 * os:timer()) mat:setPosition(os:timer(),os:timer()) spr:setShaderConstant("tMatrix",Shader.CMATRIX,1,mat:getMatrix()) end)

SinisterSoft

Does this work with textures that wrap? If so, it could be very nice for effects.

MoKaLux

SinisterSoft said:

Does this work with textures that wrap? If so, it could be very nice for effects.

yes, that's what I am after, I want to simulate a rolling water effect

MoKaLux

There are two issues here: first setTextureMatrix doesn't do anything in gideros (I have just looked at the code and the function miss the important part, I have fixed it now). Second issue is that you should call setRotationZ(), not setRotationX()

feedback: it works now