LPRO Semi-Transparency (for HWA)

prester · November 9, 2022 at 11:10 AM

About Active object's effect "Alpha-Blending coefficient", Probably basic, but not be able to how to implement on my test extension.
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I found an old forum post, unfortunately not for HWA.
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"Sprite display structure" at Cncf.h, "ros.rsFlash" "ros.rsFlags" "rsEffect" "rsEffectParam" etcs..
At first thought it was simple, actually not so easy with try and errors what i realized.
Any sample codes or Documents are there?

P.S. If it is possible, from the extension, i wish to control the shader effect param.

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Thanks.

defisym · November 9, 2022 at 11:20 AM

Still experimental.

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Note that you need an unreleased SDK with shader class.

prester · November 9, 2022 at 11:46 AM

Thanks for your quick replay! >> defisym
I'll check it soon now.

Yves · November 9, 2022 at 11:50 AM

If you want to retrieve the blend coefficient:

Code

int nBlendCoef = 0;
		switch(rdPtr->rs.rsEffect & BOP_MASK) {
		case BOP_EFFECTEX:
			{
				CEffectEx* pEffectEx = (CEffectEx*)rdPtr->rs.rsEffectParam;
				if ( pEffectEx != NULL )
					nBlendCoef = 255 - (pEffectEx->GetRGBA() >> 24);
			}
			break;
		case BOP_BLEND: // old semi-transparency coef
			nBlendCoef = 255 - SEMITRANSPTOALPHA(rdPtr->rs.rsEffectParam);
			break;
		default:
			if ( rdPtr->rs.rsEffect & BOP_RGBAFILTER )
				nBlendCoef = 255 - (((DWORD)rdPtr->rs.rsEffectParam) >> 24);
			break;
		}

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prester · November 9, 2022 at 12:53 PM

très bien merci! > Yves

Thanks a lot!

prester · November 9, 2022 at 2:35 PM

Still Hard-Coding.. but the result is great.
Fixed Yves code.

Code

void TEST::SetSemiTrans(LPRO myobj, int coef)
{
	// LPRO myobj = (LPRO)CNC_GetParameter(rdPtr);
	int nBlendCoef = 0;
	
	switch (myobj->ros.rsEffect & BOP_MASK) {
	case BOP_EFFECTEX:
	{
		CEffectEx* pEffectEx = (CEffectEx*)myobj->ros.rsEffectParam;// Need #include    "EffectEx.h" from MMF Headers


		if (pEffectEx != NULL)
			nBlendCoef = 255 - (pEffectEx->GetRGBA() >> 24);// pEffectEx->GetRGBA() == default >> -1; >> result calc == 0;
			int a = 939524095;// Hardcode
			pEffectEx->SetRGBA(a);// find at "EffectEx.h"
		
	}
	break;
	case BOP_BLEND: // old semi-transparency coef
		nBlendCoef = 255 - SEMITRANSPTOALPHA(myobj->ros.rsEffectParam);
		break;
	default:
		if (myobj->ros.rsEffect & BOP_RGBAFILTER)
			nBlendCoef = 255 - (((DWORD)myobj->ros.rsEffectParam) >> 24);
		break;
	}
	;
}
;

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