deargui-vpl/ref/virtools/Samples/Behaviors/Shader/Sources/StretchRect.cpp

/////////////////////////////////////////////////////
/////////////////////////////////////////////////////
//
//		            StretchRect
//
/////////////////////////////////////////////////////
/////////////////////////////////////////////////////
#include "stdafx.h"
#include "CKRasterizer.h"

CKERROR CreateStretchRectProto(CKBehaviorPrototype **);
int StretchRect(const CKBehaviorContext& behcontext);


extern CKGUID CKPGUID_CUBEFACE;

// input parameters
enum 
{
	InParam_SrcTexture = 0,
	InParam_SrcRect,
	InParam_SrcCubeFace,
	InParam_DestTexture,
	InParam_DestRect,
	InParam_DestCubeFace,
	InParam_Filtered
};

CKObjectDeclaration	*FillBehaviorStretchRect()
{

	CKObjectDeclaration *od = CreateCKObjectDeclaration("Stretch Rect");
	od->SetDescription("copy a rectangular area of the framebuffer into a texture, with possible stretching");	
	od->SetCategory("Shaders/General");
	od->SetType(CKDLL_BEHAVIORPROTOTYPE);
	od->SetGuid(CKGUID(0x3f1c662a, 0x167e6d7f));
	od->SetAuthorGuid(CKGUID());
	od->SetAuthorName("Virtools");
	od->SetVersion(0x00010000);
	od->SetCreationFunction(CreateStretchRectProto);
	return od;
}

CKERROR CreateStretchRectProto(CKBehaviorPrototype **pproto)
{
	CKBehaviorPrototype *proto = CreateCKBehaviorPrototype("Stretch Rect");
	if(!proto) return CKERR_OUTOFMEMORY;

	proto->DeclareInput("In");
	proto->DeclareOutput("Out");
	proto->DeclareOutput("Error");

	proto->DeclareInParameter("Source Texture", CKPGUID_TEXTURE);
	proto->DeclareInParameter("Source Rect", CKPGUID_RECT,	"(0,0),(0,0)" );
	proto->DeclareInParameter("Source Cube Face", CKPGUID_CUBEFACE,	"XPos" );
	proto->DeclareInParameter("Dest Texture", CKPGUID_TEXTURE);	
	proto->DeclareInParameter("Dest Rect",	 CKPGUID_RECT,	"(0,0),(0,0)" );
	proto->DeclareInParameter("Dest Cube Face", CKPGUID_CUBEFACE,	"XPos" );
	proto->DeclareInParameter("Filtered",	 CKPGUID_BOOL,	"TRUE" );	

	proto->SetFlags(CK_BEHAVIORPROTOTYPE_NORMAL);
	proto->SetFunction(StretchRect);
	proto->SetBehaviorFlags(CKBEHAVIOR_TARGETABLE);
	

	*pproto = proto;
	return CK_OK;

}


static int SetupCKTextureRstID(const CKBehaviorContext& behcontext, int inputParameter)
{
	CKBehavior* beh = behcontext.Behavior;
	CKDWORD rstTexID = 0;
	CK_ID texObjectID;
	if (beh->GetInputParameterValue(inputParameter, &texObjectID) == CK_OK)	
	{		
		CKTexture* destTex = (CKTexture*) behcontext.Context->GetObject(texObjectID);
		if (destTex)
		{			
			destTex->EnsureVideoMemory(behcontext.CurrentRenderContext);			
			rstTexID = destTex->GetRstTextureIndex();
		}
	}
	return rstTexID;
}


static CKRECT* vxRectToCKRECT(const VxRect* src, CKRECT& destStorage)
{
	if (!src) return NULL;
	destStorage.bottom = (int) src->bottom;
	destStorage.top = (int) src->top;
	destStorage.left = (int) src->left;
	destStorage.right = (int) src->right;
	return &destStorage;
}

int StretchRect(const CKBehaviorContext& behcontext)
{
	CKBehavior* beh = behcontext.Behavior;
	beh->ActivateInput(0,FALSE);
	//
	CKRasterizerContext* rsctx = behcontext.CurrentRenderContext->GetRasterizerContext();
	if (!rsctx)
	{
		beh->ActivateOutput(1);	
		return CKBR_OK;
	}	
	//	
	VxRect fSrcRect;
	VxRect fDestRect;
	CKRECT srcRect;
	CKRECT destRect;
	VxRect* fSrcRectPtr = NULL;
	VxRect* fDestRectPtr = NULL;

	int srcTexID = SetupCKTextureRstID(behcontext, InParam_SrcTexture);	
	int destTexID = SetupCKTextureRstID(behcontext, InParam_DestTexture);
	
	if (beh->GetInputParameterValue(InParam_SrcRect, &fSrcRect) == CK_OK)
	{
		fSrcRectPtr = fSrcRect.IsNull() ? NULL : &fSrcRect;
	}	
	if (beh->GetInputParameterValue(InParam_DestRect, &fDestRect) == CK_OK)
	{
		fDestRectPtr = fDestRect.IsNull() ? NULL : &fDestRect;
	}
	CKBOOL filter = TRUE;
	beh->GetInputParameterValue(InParam_Filtered, &filter);
	//
	CKDWORD srcCubeFace = CKRST_CUBEFACE_XPOS;
	CKDWORD destCubeFace = CKRST_CUBEFACE_XPOS;
	//
	beh->GetInputParameterValue(InParam_SrcCubeFace, &srcCubeFace);
	beh->GetInputParameterValue(InParam_DestCubeFace, &destCubeFace);
	//
	CKRST_STRETCHRECT_ERROR srErr = (rsctx->StretchRect(destTexID, vxRectToCKRECT(fDestRectPtr, destRect), (CKRST_CUBEFACE) destCubeFace,
									 srcTexID, vxRectToCKRECT(fSrcRectPtr, srcRect), (CKRST_CUBEFACE) srcCubeFace, filter));
	if (srErr != CKRST_STRETCHRECT_NO_ERROR)
	{
		char* errMsg;
		switch(srErr)
		{
			case CKRST_STRETCHRECT_UNSUPPORTED: 
				errMsg = "Stretch Rect : Rasterizer has no stretch rect support."; 
			break;
			case CKRST_STRETCHRECT_DEST_EQUAL_SOURCE_ERROR: 
				errMsg = "Stretch Rect : Source and Destination should be different.";
			break;
			case CKRST_STRETCHRECT_BLIT_FROM_MULTISAMPLED_BACKBUFFER_ERROR: 
				errMsg = "Stretch Rect : Can't stretch rect from a multisampled render target. \n"
                         "You should use the 'Resolve Multisampling' BB prior ro 'Stetch Rect'. \n"
						 "You should also activate the 'CK2_3D/OffscreenMultiSampledBuffer' in order to permit such manual multisampling resolve.";
			break;
			case CKRST_STRETCHRECT_BLIT_TO_MULTISAMPLED_BACKBUFFER_ERROR: 
				errMsg = "Stretch Rect : Can't stretch rect to a multisampled render target. \n"
					     "You should use the 'Resolve Multisampling' BB prior ro 'Stetch Rect'. \n"
						 "You should also activate the 'CK2_3D/OffscreenMultiSampledBuffer' in order to permit such manual multisampling resolve."; 
			break;
			case CKRST_STRETCHRECT_NONPOW2_SRC_TEX_ERROR:  
				errMsg = "Stretch Rect : Source texture dimensions should be powers of 2, unless the source is the back buffer.";
			break;
			case CKRST_STRETCHRECT_NONPOW2_DEST_TEX_ERROR: 
				errMsg = "Stretch Rect : Destination texture dimensions should be powers of 2, unless the destination is the back buffer."; 
			break;
			case CKRST_STRETCHRECT_SRC_RECT_ERROR: 
				errMsg = "Stretch Rect : Source rectangle is outside of the surface."; 
			break;
			case CKRST_STRETCHRECT_DEST_RECT_ERROR: 
				errMsg = "Stretch Rect : Dest rectangle is outside of the surface."; 
			break;
			case CKRST_STRETCHRECT_BAD_CUBE_FACE_ERROR:
				errMsg = "Stretch Rect : Cube map face is invalid."; break;
			break;
			default:
			case CKRST_STRETCHRECT_OPERATION_FAILED_ERROR: 	
				errMsg = "Stretch Rect : Stretch rect operation failed (possibly due to unsupportedd multisampling / format / texture type combination."; break;
			break;
		}
		beh->m_Context->OutputToConsole(errMsg);
		beh->ActivateOutput(1);	
		return CKBR_OK;
	}
	beh->ActivateOutput(0);
	return CKBR_OK;
}