BRL.Max2D - INVERTBLEND

BlitzMax Forums/BlitzMax Module Tweaks/BRL.Max2D - INVERTBLEND

Red	(Posted 2005) [#1]

This blend invert pixel color value. ( negative image )

driver.bmx ( BRL.max2D )
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At line 13, insert lines :

Const INVERTBLEND=6

d3d7max2D.bmx ( BRL.d3d7max2D )
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At line 243, insert lines :

		Case INVERTBLEND
			device.SetRenderState D3DRS_ALPHATESTENABLE,False  
			device.SetRenderState D3DRS_ALPHABLENDENABLE,True  
			device.SetRenderState D3DRS_SRCBLEND,D3DBLEND_INVDESTCOLOR
			device.SetRenderState D3DRS_DESTBLEND,D3DBLEND_ZERO

glmax2D.bmx ( BRL.Glmax2D )

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At line 299, insert lines :

	Case INVERTBLEND
		glEnable GL_BLEND
		glBlendFunc GL_ONE_MINUS_DST_COLOR, GL_ZERO
		glDisable GL_ALPHA_TEST

TartanTangerine (was Indiepath)

(Posted 2005) [#2]

Nice, Mark - Stick it in the official mods please.

Robert Cummings

(Posted 2005) [#3]

Yep, I second this, if it is well compatible!

xlsior

(Posted 2005) [#4]

Would be a nice addition -- the more blend modes, the better.

Jay Kyburz

(Posted 2005) [#5]

You guys rock.

Ferminho

(Posted 2005) [#6]

Nice one! Cool blend ;)

I made a minor change, hope you don't mind:

glBlendFunc GL_ONE_MINUS_DST_COLOR, GL_ONE_MINUS_SRC_COLOR

so the inversion is gradual (black doesn't invert, white inverts 100%), I think it may be good for some distortion fx!

for dx version (I'm not sure, haven't tested) the change would be something like...

device.SetRenderState D3DRS_SRCBLEND,D3DBLEND_INVDESTCOLOR
device.SetRenderState D3DRS_DESTBLEND,D3DBLEND_INVSRCCOLOR

(well in fact, I made a new blend; I think both of them are useful)

Red	(Posted 2005) [#7]

At start,I wanted to invert source image color without using pixmap pixel pointer.