Difference between revisions of "Lua Shader Gideros Examples"

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(Created page with "'''Parent:''' Writing Lua Shaders<br/> __TOC__ '''Requirements''': '''In order to use Lua Shaders you need to include ''luashader'' standard library in your projects'...")
 
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'''Parent:''' [[Writing Lua Shaders]]<br/>
 
'''Parent:''' [[Writing Lua Shaders]]<br/>
  
−
 
+
__NOTOC__
−
__TOC__
 
  
 
  '''Requirements''':
 
  '''Requirements''':
Line 11: Line 10:
 
These are the Lua Shaders examples that come with Gideros installation (eg.: ''C:\Program Files\Gideros\Examples\Shaders\LuaShaders'').
 
These are the Lua Shaders examples that come with Gideros installation (eg.: ''C:\Program Files\Gideros\Examples\Shaders\LuaShaders'').
  
−
=== Shader Saturate ===
+
To use them simply add a shader to a Sprite, for example:
 
<syntaxhighlight lang="lua">
 
<syntaxhighlight lang="lua">
 +
local s = Pixel.new(256, 128, Texture.new("texture.jpg", false))
 +
s:setShader(Effect.grayscale)
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
=== Rain drops demo - by Hgy29 ===
+
Below are the effects Shader available as of Gideros 2025.3.
 +
 
 
<syntaxhighlight lang="lua">
 
<syntaxhighlight lang="lua">
 +
--!NEEDS:luashader/luashader.lua
 +
 +
local function makeEffect(name,vshader,fshader)
 +
local s=Shader.lua(vshader,fshader,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="fTextureInfo",type=Shader.CFLOAT4,sys=Shader.SYS_TEXTUREINFO,vertex=false},
 +
{name="fTime",type=Shader.CFLOAT,sys=Shader.SYS_TIMER,vertex=false},
 +
},
 +
{
 +
{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},
 +
}
 +
)
 +
s.name=name
 +
return s
 +
end
 +
 +
Effect={}
 +
 +
Effect.none=makeEffect("None",
 +
function (vVertex,vColor,vTexCoord) : Shader
 +
local vertex = hF4(vVertex,0.0,1.0)
 +
fTexCoord=vTexCoord
 +
return vMatrix*vertex
 +
end,
 +
function () : Shader
 +
local frag=lF4(fColor)*texture2D(fTexture, fTexCoord)
 +
if (frag.a==0.0) then discard() end
 +
return frag
 +
end)
 +
 +
Effect.blur=makeEffect("Blur",
 +
function (vVertex,vColor,vTexCoord) : Shader
 +
local vertex = hF4(vVertex,0.0,1.0)
 +
fTexCoord=vTexCoord
 +
return vMatrix*vertex
 +
end,
 +
function () : Shader
 +
local frag=lF4(0,0,0,0)
 +
local frad=floor((1+sin(fTime))*4)%9 --For the demo use time for rad
 +
local ext=2*frad+1
 +
local tc=fTexCoord-fTextureInfo.zw*frad
 +
for v=0,19 do
 +
if v<ext then
 +
frag=frag+lF4(fColor)*texture2D(fTexture, tc)
 +
end
 +
tc+=fTextureInfo.zw
 +
end
 +
frag=frag/ext
 +
if (frag.a==0.0) then discard() end
 +
return frag
 +
end)
 +
 +
Effect.grayscale=makeEffect("Grayscale",
 +
function (vVertex,vColor,vTexCoord) : Shader
 +
local vertex = hF4(vVertex,0.0,1.0)
 +
fTexCoord=vTexCoord
 +
return vMatrix*vertex
 +
end,
 +
function () : Shader
 +
local frag=lF4(fColor)*texture2D(fTexture, fTexCoord)
 +
local coef=lF3(0.2125, 0.7154, 0.0721)
 +
local gray=dot(frag.rgb,coef)
 +
frag.rgb=lF3(gray,gray,gray)
 +
if (frag.a==0.0) then discard() end
 +
return frag
 +
end)
 +
 +
Effect.saturate=makeEffect("Saturate",
 +
function (vVertex,vColor,vTexCoord) : Shader
 +
local vertex = hF4(vVertex,0.0,1.0)
 +
fTexCoord=vTexCoord
 +
return vMatrix*vertex
 +
end,
 +
function () : Shader
 +
local frad=(1+sin(fTime))*0.5
 +
local frag=lF4(fColor)*texture2D(fTexture, fTexCoord)
 +
local coef=lF3(0.2125, 0.7154, 0.0721)
 +
local dp=dot(frag.rgb,coef)
 +
frag.rgb=mix(frag.rgb,frag.rgb/dp,frad)
 +
if (frag.a==0.0) then discard() end
 +
return frag
 +
end)
 +
 +
Effect.emphasize=makeEffect("Emphasize",
 +
function (vVertex,vColor,vTexCoord) : Shader
 +
local vertex = hF4(vVertex,0.0,1.0)
 +
fTexCoord=vTexCoord
 +
return vMatrix*vertex
 +
end,
 +
function () : Shader
 +
local frag=lF4(fColor)*texture2D(fTexture, fTexCoord)
 +
local e=lF1(2+sin(fTime))
 +
frag.rgb=lF3(frag.r^e,frag.g^e,frag.b^e)
 +
if (frag.a==0.0) then discard() end
 +
return frag
 +
end)
 +
 +
Effect.waves=makeEffect("Waves",
 +
function (vVertex,vColor,vTexCoord) : Shader
 +
local vertex = hF4(vVertex,0.0,1.0)
 +
fTexCoord=vTexCoord
 +
return vMatrix*vertex
 +
end,
 +
function () : Shader
 +
local tc=hF2(fTexCoord.x+(1+sin(fTexCoord.x*10+fTime*2))*0.05,fTexCoord.y)*0.9
 +
local frag=lF4(fColor)*texture2D(fTexture, tc)
 +
if (frag.a==0.0) then discard() end
 +
return frag
 +
end)
 +
 +
Effect.bloom=makeEffect("Bloom",
 +
function (vVertex,vColor,vTexCoord) : Shader
 +
local vertex = hF4(vVertex,0.0,1.0)
 +
fTexCoord=vTexCoord
 +
return vMatrix*vertex
 +
end,
 +
function () : Shader
 +
local frag=lF4(0,0,0,0)
 +
local amount=0.5*(1+sin(fTime))
 +
local frad=floor(amount*8)%9 --For the demo use time for rad
 +
local ext=2*frad+1
 +
local tc=fTexCoord-fTextureInfo.zw*frad
 +
for v=0,19 do
 +
if v<ext then
 +
frag=frag+lF4(fColor)*texture2D(fTexture, tc)
 +
end
 +
tc+=fTextureInfo.zw
 +
end
 +
frag=frag/ext
 +
 +
local bfrag=lF4(fColor)*texture2D(fTexture, fTexCoord)
 +
local coef=lF3(0.2125, 0.7154, 0.0721)
 +
local dp=dot(bfrag.rgb,coef)
 +
if dp<0.5 then bfrag.rgb=lF3(0,0,0) end
 +
frag.rgb=frag.rgb+bfrag.rgb*amount
 +
 +
if (frag.a==0.0) then discard() end
 +
return frag
 +
end)
 
</syntaxhighlight>
 
</syntaxhighlight>
  
 
{{SHADERS}}
 
{{SHADERS}}

Revision as of 02:01, 27 March 2025

Parent: Writing Lua Shaders


Requirements:
In order to use Lua Shaders you need to include luashader standard library in your projects
luashader standard library is available in your Gideros installation folder under Library


These are the Lua Shaders examples that come with Gideros installation (eg.: C:\Program Files\Gideros\Examples\Shaders\LuaShaders).

To use them simply add a shader to a Sprite, for example: 

local s = Pixel.new(256, 128, Texture.new("texture.jpg", false))
s:setShader(Effect.grayscale)

Below are the effects Shader available as of Gideros 2025.3. 

--!NEEDS:luashader/luashader.lua

local function makeEffect(name,vshader,fshader)
	local s=Shader.lua(vshader,fshader,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="fTextureInfo",type=Shader.CFLOAT4,sys=Shader.SYS_TEXTUREINFO,vertex=false},
	{name="fTime",type=Shader.CFLOAT,sys=Shader.SYS_TIMER,vertex=false},
	},
	{
	{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},
	}
	)
	s.name=name
	return s
end

Effect={}

Effect.none=makeEffect("None",
	function (vVertex,vColor,vTexCoord) : Shader
		local vertex = hF4(vVertex,0.0,1.0)
		fTexCoord=vTexCoord
		return vMatrix*vertex
	end,
	function () : Shader
	 local frag=lF4(fColor)*texture2D(fTexture, fTexCoord)
	 if (frag.a==0.0) then discard() end
	 return frag
	end)	
	
Effect.blur=makeEffect("Blur",
	function (vVertex,vColor,vTexCoord) : Shader
		local vertex = hF4(vVertex,0.0,1.0)
		fTexCoord=vTexCoord
		return vMatrix*vertex
	end,
	function () : Shader
	 local frag=lF4(0,0,0,0)
	 local frad=floor((1+sin(fTime))*4)%9 --For the demo use time for rad
	 local ext=2*frad+1
	 local tc=fTexCoord-fTextureInfo.zw*frad
	 for v=0,19 do
		if v<ext then
			frag=frag+lF4(fColor)*texture2D(fTexture, tc)
		end
		tc+=fTextureInfo.zw
	 end
	 frag=frag/ext
	 if (frag.a==0.0) then discard() end
	 return frag
	end)

Effect.grayscale=makeEffect("Grayscale",
	function (vVertex,vColor,vTexCoord) : Shader
		local vertex = hF4(vVertex,0.0,1.0)
		fTexCoord=vTexCoord
		return vMatrix*vertex
	end,
	function () : Shader
	 local frag=lF4(fColor)*texture2D(fTexture, fTexCoord)
	 local coef=lF3(0.2125, 0.7154, 0.0721)
	 local gray=dot(frag.rgb,coef)
	 frag.rgb=lF3(gray,gray,gray)
	 if (frag.a==0.0) then discard() end
	 return frag
	end)

Effect.saturate=makeEffect("Saturate",
	function (vVertex,vColor,vTexCoord) : Shader
		local vertex = hF4(vVertex,0.0,1.0)
		fTexCoord=vTexCoord
		return vMatrix*vertex
	end,
	function () : Shader
	 local frad=(1+sin(fTime))*0.5
	 local frag=lF4(fColor)*texture2D(fTexture, fTexCoord)
	 local coef=lF3(0.2125, 0.7154, 0.0721)
	 local dp=dot(frag.rgb,coef)
	 frag.rgb=mix(frag.rgb,frag.rgb/dp,frad)
	 if (frag.a==0.0) then discard() end
	 return frag
	end)

Effect.emphasize=makeEffect("Emphasize",
	function (vVertex,vColor,vTexCoord) : Shader
		local vertex = hF4(vVertex,0.0,1.0)
		fTexCoord=vTexCoord
		return vMatrix*vertex
	end,
	function () : Shader
	 local frag=lF4(fColor)*texture2D(fTexture, fTexCoord)
	 local e=lF1(2+sin(fTime))
	 frag.rgb=lF3(frag.r^e,frag.g^e,frag.b^e)
	 if (frag.a==0.0) then discard() end
	 return frag
	end)

Effect.waves=makeEffect("Waves",
	function (vVertex,vColor,vTexCoord) : Shader
		local vertex = hF4(vVertex,0.0,1.0)
		fTexCoord=vTexCoord
		return vMatrix*vertex
	end,
	function () : Shader
	 local tc=hF2(fTexCoord.x+(1+sin(fTexCoord.x*10+fTime*2))*0.05,fTexCoord.y)*0.9
	 local frag=lF4(fColor)*texture2D(fTexture, tc)
	 if (frag.a==0.0) then discard() end
	 return frag
	end)

Effect.bloom=makeEffect("Bloom",
	function (vVertex,vColor,vTexCoord) : Shader
		local vertex = hF4(vVertex,0.0,1.0)
		fTexCoord=vTexCoord
		return vMatrix*vertex
	end,
	function () : Shader
	 local frag=lF4(0,0,0,0)
	 local amount=0.5*(1+sin(fTime))
	 local frad=floor(amount*8)%9 --For the demo use time for rad
	 local ext=2*frad+1
	 local tc=fTexCoord-fTextureInfo.zw*frad
	 for v=0,19 do
		if v<ext then
			frag=frag+lF4(fColor)*texture2D(fTexture, tc)
		end
		tc+=fTextureInfo.zw
	 end
	 frag=frag/ext
	 
	 local bfrag=lF4(fColor)*texture2D(fTexture, fTexCoord)
 	 local coef=lF3(0.2125, 0.7154, 0.0721)
	 local dp=dot(bfrag.rgb,coef)
	 if dp<0.5 then bfrag.rgb=lF3(0,0,0) end
	 frag.rgb=frag.rgb+bfrag.rgb*amount	

	 if (frag.a==0.0) then discard() end
	 return frag
	end)



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