CWE-ou-minkata/Sources/Tools/MaxPlasmaMtls/plBMSampler.cpp

/*==LICENSE==*

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*==LICENSE==*/
#include "hsTypes.h"
#include "max.h"
#include "texutil.h"
#include "iparamb2.h"

#include <commdlg.h>
#include "bmmlib.h"
#include "bitmap.h"

#include "Layers\plPlasmaMAXLayer.h"
#include "plBMSampler.h"

plBMSampler::plBMSampler(plPlasmaMAXLayer *layer, Bitmap *bm) : fBM(bm), fInitialized(false)
{
	// Get our parameters
	if( fBM && layer && layer->GetSamplerInfo( &fData ) )
	{
		u1 = fData.fClipU + fData.fClipW;
		v1 = fData.fClipV + fData.fClipH;
		bmw = fBM->Width();
		bmh = fBM->Height();
		fbmw = float(bmw-1);
		fbmh = float(bmh-1);
		clipx = int(fData.fClipU*fbmw);
		clipy = int(fData.fClipV*fbmh);
		fclipw = fData.fClipW*fbmw;
		fcliph = fData.fClipH*fbmh;
		cliph = fcliph;

		fInitialized = true;
	}
}

int plBMSampler::PlaceUV(ShadeContext &sc, float &u, float &v, int iu, int iv) 
{
	if (!fInitialized)
		return 1;

	if (u<fData.fClipU||v<fData.fClipV||u>u1||v>v1)
		return 0;

	u = (u-fData.fClipU)/fData.fClipW;
	v = (v-fData.fClipV)/fData.fClipH;

	return 1;
}

void plBMSampler::PlaceUVFilter(ShadeContext &sc, float &u, float &v, int iu, int iv) 
{
	if (!fInitialized)
		return;

	u = (u-fData.fClipU)/fData.fClipW;
	v = (v-fData.fClipV)/fData.fClipH;
}

AColor plBMSampler::Sample(ShadeContext& sc, float u,float v) 
{
	AColor none(0.0f, 0.0f, 0.0f, 0.0f);

	if (!fInitialized)
		return none;

	BMM_Color_64 c;
	int x,y;
	float fu,fv;
	fu = frac(u);
	fv = 1.0f-frac(v);
	if (fData.fEnableCrop)
	{
		if (fData.fCropPlacement)
		{
			if (!PlaceUV(sc,fu, fv, int(u), int(v)))
				return AColor(0,0,0,0);
			x = (int)(fu*fbmw+0.5f);
			y = (int)(fv*fbmh+0.5f);
		}
		else
		{
			x = mod(clipx + (int)(fu*fclipw+0.5f),bmw);
			y = mod(clipy + (int)(fv*fcliph+0.5f),bmh);
		}
	}
	else
	{
		x = (int)(fu*fbmw+0.5f);
		y = (int)(fv*fbmh+0.5f);
	}
	fBM->GetLinearPixels(x,y,1,&c);
	switch(fData.fAlphaSource)
	{
	case plBMSamplerData::kDiscard:
		c.a = 0xffff; 
		break;
	case plBMSamplerData::kFromRGB:
		c.a = (c.r+c.g+c.b)/3; 
		break;
		//	TBD
		// XPCOL needs to be handled in bitmap for filtering. 
		// Need to open a bitmap with this property.
		//	case ALPHA_XPCOL:  break; 
	}
	return c;
}


AColor plBMSampler::SampleFilter(ShadeContext& sc, float u,float v, float du, float dv) 
{
	AColor none(0.0f, 0.0f, 0.0f, 0.0f);

	if (!fInitialized)
		return none;

	fBM->SetFilter(BMM_FILTER_PYRAMID);

	BMM_Color_64 c;
	float fu,fv;
	fu = frac(u);
	fv = 1.0f-frac(v);
	if (fData.fEnableCrop)
	{
		if (fData.fCropPlacement)
		{
			PlaceUVFilter(sc,fu, fv, int(u), int(v));
			du /= fData.fClipW;
			dv /= fData.fClipH;
			float du2 = 0.5f*du;
			float ua = fu-du2;
			float ub = fu+du2;
			if (ub<=0.0f||ua>=1.0f) return none;
			float dv2 = 0.5f*dv;
			float va = fv-dv2;
			float vb = fv+du2;
			if (vb<=0.0f||va>=1.0f) return none;
			BOOL clip = 0;
			if (ua<0.0f) { ua=0.0f; clip = 1; }
			if (ub>1.0f) { ub=1.0f; clip = 1; }
			if (va<0.0f) { va=0.0f; clip = 1; }
			if (vb>1.0f) { vb=1.0f; clip = 1; }
			fBM->GetFiltered(fu,fv,du,dv,&c);
			switch(fData.fAlphaSource)
			{
			case plBMSamplerData::kDiscard:
				c.a = 0xffff; 
				break;
			case plBMSamplerData::kFromRGB:   
				c.a = (c.r + c.g + c.b)/3; 
				break;
			}
			AColor ac(c);
			if (clip)
			{
				float f = ((ub-ua)/du) * ((vb-va)/dv);
				ac *= f;
			}
			return ac;
		}
		else
		{
			fu = (fData.fClipU + fData.fClipW*fu);
			fv = (fData.fClipV + fData.fClipH*fv);
			du *= fData.fClipW;
			dv *= fData.fClipH;
			fBM->GetFiltered(fu,fv,du,dv,&c);
		}
	}
	else 
		fBM->GetFiltered(fu,fv,du,dv,&c);

	switch (fData.fAlphaSource)
	{
	case plBMSamplerData::kDiscard:  
		c.a = 0xffff; 
		break;
	case plBMSamplerData::kFromRGB:   
		c.a = (c.r + c.g + c.b)/3; 
		break;
	}

	return c;
}