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I need Description for SpriteBlendingMode constants

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I need Description for SpriteBlendingMode constants

Posted: Wed May 29, 2024 9:31 am
by Voidy
I need a description of what each constant does:

#PB_Sprite_BlendZero: ?
#PB_Sprite_BlendOne: ?
#PB_Sprite_BlendSourceColor: ?
#PB_Sprite_BlendInvertSourceColor: ?
#PB_Sprite_BlendDestinationColor: ?
#PB_Sprite_BlendInvertDestinationColor: ?
#PB_Sprite_BlendSourceAlpha: ?
#PB_Sprite_BlendInvertSourceAlpha: ?
#PB_Sprite_BlendDestinationAlpha: ?
#PB_Sprite_BlendInvertDestinationAlpha: ?

I need your help. Thank you

Re: I need Description for SpriteBlendingMode constants

Posted: Wed May 29, 2024 9:38 am
by STARGÅTE
It depends on the graphic engine.

For OpenGL: https://registry.khronos.org/OpenGL-Ref ... Func.xhtml
For DirectX: https://learn.microsoft.com/en-us/windo ... 9/d3dblend

Re: I need Description for SpriteBlendingMode constants

Posted: Wed May 29, 2024 9:59 am
by Voidy
Thank you

But there is no explanation of what that means, just values ​​e.g. (1 - Rₛ, 1 - Gₛ, 1 - Bₛ, 1 - Aₛ).
I need an understandable explanation. Example:
#PB_Sprite_BlendOne (GL_ONE / D3DBLEND_ONE): The colors become brighter.

Re: I need Description for SpriteBlendingMode constants

Posted: Wed May 29, 2024 10:34 am
by STARGÅTE
SpriteBlendingMode defines, how the new color is calculated, when a Sprite (source) is displayed on the background (destination).

The equation is: color_new = color_source * factor_source + color_destination * factor_destination

If you now use e.g. SpriteBlendingMode(#PB_Sprite_BlendOne, #PB_Sprite_BlendZero), factor_source is 1 and factor_destination is 0.
color_new = color_source * 1 + color_destination * 0
Meaning, the Sprite is render without interaction with the background.

The default mode is: SpriteBlendingMode(#PB_Sprite_BlendSourceAlpha, #PB_Sprite_BlendInvertSourceAlpha)
So factor_source is the alpha value of each pixel and factor_destination is 1 minus the alpha value of each pixel.
color_new = color_source * alpha_source + color_destination * (1-alpha_sources).
Meaning, the Sprite is shown, where the alpha is high and the background is shown, where the alpha is low.

Here is an example:

Code: Select all

Enumeration
	#Window
	#Sprite
	#Font
EndEnumeration

InitSprite()
UsePNGImageDecoder()

OpenWindow(#Window, 0, 0, 1600, 800, "ScreenTitle", #PB_Window_SystemMenu|#PB_Window_ScreenCentered)
OpenWindowedScreen(WindowID(#Window), 0, 0, WindowWidth(#Window), WindowHeight(#Window), 0, 0, 0)
LoadFont(#Font, "Arial", 8)
CatchSprite(#Sprite, ?Particle, #PB_Sprite_AlphaBlending)

Dim Sprite_Blend.s(10)
Sprite_Blend(#PB_Sprite_BlendDestinationAlpha)       = "DestAlpha"
Sprite_Blend(#PB_Sprite_BlendDestinationColor)       = "DestColor"
Sprite_Blend(#PB_Sprite_BlendInvertDestinationAlpha) = "InvDestAlpha"
Sprite_Blend(#PB_Sprite_BlendInvertDestinationColor) = "InvDestColor"
Sprite_Blend(#PB_Sprite_BlendSourceAlpha)            = "SourAlpha"
Sprite_Blend(#PB_Sprite_BlendSourceColor)            = "SourColor"
Sprite_Blend(#PB_Sprite_BlendInvertSourceAlpha)      = "InvSourAlpha"
Sprite_Blend(#PB_Sprite_BlendInvertSourceColor)      = "InvSourColor"
Sprite_Blend(#PB_Sprite_BlendOne)                    = "One"
Sprite_Blend(#PB_Sprite_BlendZero)                   = "Zero"

Repeat
	
	Repeat
		
		Select WindowEvent()
			Case #PB_Event_CloseWindow
				End
			Case #Null
				Break
		EndSelect
		
	ForEver
	
	ClearScreen($404040)
	
	For Y = 0 To 9
		For X = 0 To 9
			SpriteBlendingMode(X+i, Y+I)
			RandomSeed(6)
			For n = 1 To 30
				D = Random(100)
				DisplayTransparentSprite(#Sprite, X*160+10+D, Y*80+15+Random(15), 255, RGB(D*2+25, 230-D*2, 64))
			Next
		Next
	Next
	
	If StartDrawing(ScreenOutput())
		DrawingMode(#PB_2DDrawing_Transparent)
		DrawingFont(FontID(#Font))
		For Y = 0 To 9
			For X = 0 To 9
				DrawText(X*160, Y*80, Sprite_Blend(X)+" & "+Sprite_Blend(Y))
			Next
		Next
		StopDrawing()
	EndIf
	
	FlipBuffers()
	
ForEver

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Re: I need Description for SpriteBlendingMode constants

Posted: Wed May 29, 2024 11:29 am
by DarkDragon
Also keep in mind that this isn't pixel perfect and you will get different results on different systems. We had a really large thread somewhere showing the differences.

Re: I need Description for SpriteBlendingMode constants

Posted: Thu May 30, 2024 8:38 am
by Voidy
Thank you STARGÅTE! Perfect example!

Re: I need Description for SpriteBlendingMode constants

Posted: Sun Mar 02, 2025 10:55 am
by Mijikai
Thank you very much for the example @STARGÅTE, it is very helpful.
This should be added to the PB help!

Re: I need Description for SpriteBlendingMode constants

Posted: Sun Mar 02, 2025 11:37 am
by Caronte3D
+1

Re: I need Description for SpriteBlendingMode constants

Posted: Wed Apr 02, 2025 9:47 am
by Skipper
Hi STARGÅTE,

thank you for this nice example, which runs perfectly on Windows 11.

On my 2016 Intel MacBook Pro running Monterey, all I get is a nice green screen, nothing more. A bit odd, as nothing in your code indicates that you used Windows specific stuff...

As I'm able to see your example on Windows, I'm happy with it. :D
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