C++ CEngineSprite::GetMaterial方法代码示例

//-----------------------------------------------------------------------------
// Purpose: Retrieve sprite object and set it up for rendering
// Input  : *pSpriteModel - 
//			frame - 
//			rendermode - 
// Output : CEngineSprite
//-----------------------------------------------------------------------------
CEngineSprite *Draw_SetSpriteTexture( const model_t *pSpriteModel, int frame, int rendermode )
{
	CEngineSprite			*psprite;
	IMaterial		*material;

	psprite = ( CEngineSprite * )modelinfo->GetModelExtraData( pSpriteModel );
	Assert( psprite );

	material = psprite->GetMaterial();
	if( !material )
		return NULL;
	
	CMatRenderContextPtr pRenderContext( materials );
	if ( ShouldDrawInWireFrameMode() || r_DrawBeams.GetInt() == 2 )
	{
		if ( !g_pBeamWireframeMaterial )
			g_pBeamWireframeMaterial = materials->FindMaterial( "shadertest/wireframevertexcolor", TEXTURE_GROUP_OTHER );
		pRenderContext->Bind( g_pBeamWireframeMaterial, NULL );
		return psprite;
	}
	
	psprite->SetFrame( frame );
	psprite->SetRenderMode( rendermode );

	pRenderContext->Bind( material );
	return psprite;
}

//-----------------------------------------------------------------------------
// Purpose: 
//-----------------------------------------------------------------------------
int CSpriteTrail::DrawModel( int flags )
{
	VPROF_BUDGET( "CSpriteTrail::DrawModel", VPROF_BUDGETGROUP_PARTICLE_RENDERING );
	
	// Must have at least one point
	if ( m_nStepCount < 1 )
		return 1;

	//See if we should draw
	if ( !IsVisible() || ( m_bReadyToDraw == false ) )
		return 0;

	CEngineSprite *pSprite = Draw_SetSpriteTexture( GetModel(), m_flFrame, GetRenderMode() );
	if ( pSprite == NULL )
		return 0;

	// Specify all the segments.
	CMatRenderContextPtr pRenderContext( g_pMaterialSystem );
	CBeamSegDraw segDraw;
	segDraw.Start( pRenderContext, m_nStepCount + 1, pSprite->GetMaterial() );
	
	// Setup the first point, always emanating from the attachment point
	TrailPoint_t *pLast = GetTrailPoint( m_nStepCount-1 );
	TrailPoint_t currentPoint;
	currentPoint.m_flDieTime = gpGlobals->curtime + m_flLifeTime;
	ComputeScreenPosition( &currentPoint.m_vecScreenPos );
	currentPoint.m_flTexCoord = pLast->m_flTexCoord + currentPoint.m_vecScreenPos.DistTo(pLast->m_vecScreenPos) * m_flTextureRes;
	currentPoint.m_flWidthVariance = 0.0f;

#if SCREEN_SPACE_TRAILS
	VMatrix	viewMatrix;
	materials->GetMatrix( MATERIAL_VIEW, &viewMatrix );
	viewMatrix = viewMatrix.InverseTR();
#endif

	TrailPoint_t *pPrevPoint = NULL;
	float flTailAlphaDist = m_flMinFadeLength;
	for ( int i = 0; i <= m_nStepCount; ++i )
	{
		// This makes it so that we're always drawing to the current location
		TrailPoint_t *pPoint = (i != m_nStepCount) ? GetTrailPoint(i) : &currentPoint;

		float flLifePerc = (pPoint->m_flDieTime - gpGlobals->curtime) / m_flLifeTime;
		flLifePerc = clamp( flLifePerc, 0.0f, 1.0f );

		BeamSeg_t curSeg;
		curSeg.m_vColor.x = (float) m_clrRender->r / 255.0f;
		curSeg.m_vColor.y = (float) m_clrRender->g / 255.0f;
		curSeg.m_vColor.z = (float) m_clrRender->b / 255.0f;

		float flAlphaFade = flLifePerc;
		if ( flTailAlphaDist > 0.0f )
		{
			if ( pPrevPoint )
			{
				float flDist = pPoint->m_vecScreenPos.DistTo( pPrevPoint->m_vecScreenPos );
				flTailAlphaDist -= flDist;
			}

			if ( flTailAlphaDist > 0.0f )
			{
				float flTailFade = Lerp( (m_flMinFadeLength - flTailAlphaDist) / m_flMinFadeLength, 0.0f, 1.0f );
				if ( flTailFade < flAlphaFade )
				{
					flAlphaFade = flTailFade;
				}
			}
		}
		curSeg.m_flAlpha  = ( (float) GetRenderBrightness() / 255.0f ) * flAlphaFade;

#if SCREEN_SPACE_TRAILS
		curSeg.m_vPos = viewMatrix * pPoint->m_vecScreenPos;
#else
		curSeg.m_vPos = pPoint->m_vecScreenPos;
#endif

		if ( m_flEndWidth >= 0.0f )
		{
			curSeg.m_flWidth = Lerp( flLifePerc, m_flEndWidth.Get(), m_flStartWidth.Get() );
		}
		else
		{
			curSeg.m_flWidth = m_flStartWidth.Get();
		}
		curSeg.m_flWidth += pPoint->m_flWidthVariance;
		if ( curSeg.m_flWidth < 0.0f )
		{
			curSeg.m_flWidth = 0.0f;
		}

		curSeg.m_flTexCoord = pPoint->m_flTexCoord;

		segDraw.NextSeg( &curSeg );

		// See if we're done with this bad boy
		if ( pPoint->m_flDieTime <= gpGlobals->curtime )
		{
//.........这里部分代码省略.........

//-----------------------------------------------------------------------------
// Purpose: 
// Input  : noise_divisions - 
//			*prgNoise - 
//			*spritemodel - 
//			frame - 
//			rendermode - 
//			source - 
//			delta - 
//			flags - 
//			*color - 
//			fadescale - 
//-----------------------------------------------------------------------------
void DrawSegs( int noise_divisions, float *prgNoise, const model_t* spritemodel,
				float frame, int rendermode, const Vector& source, const Vector& delta, 
				float startWidth, float endWidth, float scale, float freq, float speed, int segments,
				int flags, float* color, float fadeLength, float flHDRColorScale )
{
	int				i, noiseIndex, noiseStep;
	float			div, length, fraction, factor, vLast, vStep, brightness;
	
	Assert( fadeLength >= 0.0f );
	CEngineSprite *pSprite = Draw_SetSpriteTexture( spritemodel, frame, rendermode );
	if ( !pSprite )
		return;

	if ( segments < 2 )
		return;

	IMaterial *pMaterial = pSprite->GetMaterial( (RenderMode_t)rendermode );
	if( pMaterial )
	{
		static unsigned int nHDRColorScaleCache = 0;
		IMaterialVar *pHDRColorScaleVar = pMaterial->FindVarFast( "$hdrcolorscale", &nHDRColorScaleCache );
		if( pHDRColorScaleVar )
		{
			pHDRColorScaleVar->SetFloatValue( flHDRColorScale );
		}
	}
	
	length = VectorLength( delta );
	float flMaxWidth = MAX(startWidth, endWidth) * 0.5f;
	div = 1.0 / (segments-1);

	if ( length*div < flMaxWidth * 1.414 )
	{
		// Here, we have too many segments; we could get overlap... so lets have less segments
		segments = (int)(length / (flMaxWidth * 1.414)) + 1;
		if ( segments < 2 )
		{
			segments = 2;
		}
	}

	if ( segments > noise_divisions )		// UNDONE: Allow more segments?
	{
		segments = noise_divisions;
	}

	div = 1.0 / (segments-1);
	length *= 0.01;

	// UNDONE: Expose texture length scale factor to control "fuzziness"

	if ( flags & FBEAM_NOTILE )
	{
		// Don't tile
		vStep = div;
	}
	else
	{
		// Texture length texels per space pixel
		vStep = length*div;	
	}
	
	// UNDONE: Expose this paramter as well(3.5)?  Texture scroll rate along beam
	vLast = fmod(freq*speed,1);	// Scroll speed 3.5 -- initial texture position, scrolls 3.5/sec (1.0 is entire texture)

	if ( flags & FBEAM_SINENOISE )
	{
		if ( segments < 16 )
		{
			segments = 16;
			div = 1.0 / (segments-1);
		}
		scale *= 100;
		length = segments * (1.0/10);
	}
	else
	{
		scale *= length;
	}

	// Iterator to resample noise waveform (it needs to be generated in powers of 2)
	noiseStep = (int)((float)(noise_divisions-1) * div * 65536.0f);
	noiseIndex = 0;
	
	if ( flags & FBEAM_SINENOISE )
	{
		noiseIndex = 0;
//.........这里部分代码省略.........