RageTextureRenderTarget.cpp

#include "global.h"
#include "RageTextureRenderTarget.h"
#include "RageDisplay.h"

RageTextureRenderTarget::RageTextureRenderTarget( RageTextureID name, const RenderTargetParam &param ):
	RageTexture( name ),
	m_Param( param )
{
	Create();
}

RageTextureRenderTarget::~RageTextureRenderTarget()
{
	Destroy();
}

void RageTextureRenderTarget::Reload()
{
	Destroy();
	Create();
}

/* RageTextureID identifies a file and a mechanism for loading it. We don't use
 * any of that, except as a unique identifier for this texture, so it can be
 * loaded elsewhere. Render targets can't be loaded blindly like a regular
 * texture, anyway, since something has to render into it. */
void RageTextureRenderTarget::Create()
{
	/* All render targets support non-power-of-two targets,
	 * but some require that the resulting texture dimensions be powers of two.
	 * CreateRenderTarget returns the actual resolution. */
	m_iTexHandle = DISPLAY->CreateRenderTarget( m_Param, m_iTextureWidth, m_iTextureHeight );

	m_iSourceWidth = m_Param.iWidth;
	m_iSourceHeight = m_Param.iHeight;
	m_iImageWidth = m_Param.iWidth;
	m_iImageHeight = m_Param.iHeight;
	m_iFramesWide = m_iFramesHigh = 1;

	CreateFrameRects();
}

void RageTextureRenderTarget::Destroy()
{
	DISPLAY->DeleteTexture( m_iTexHandle );
}

void RageTextureRenderTarget::BeginRenderingTo( bool bPreserveTexture )
{
	m_iPreviousRenderTarget = DISPLAY->GetRenderTarget( );
	DISPLAY->SetRenderTarget( m_iTexHandle, bPreserveTexture );

	/* We're rendering to a texture, not the framebuffer.
	 * Stash away the centering matrix, and set it to identity. */
	DISPLAY->CenteringPushMatrix();
	DISPLAY->ChangeCentering( 0, 0, 0, 0 );

	// Reset the perspective to fit the new target.
	DISPLAY->CameraPushMatrix();
	DISPLAY->LoadMenuPerspective( 0, (float) m_iImageWidth, (float) m_iImageHeight, (float) m_iImageWidth/2, (float) m_iImageHeight/2 ); // 0 FOV = ortho

	DISPLAY->PushMatrix();
	DISPLAY->LoadIdentity();
}

void RageTextureRenderTarget::FinishRenderingTo()
{
	// Restore the matrices.
	DISPLAY->CenteringPopMatrix();
	DISPLAY->CameraPopMatrix();
	DISPLAY->PopMatrix();

	DISPLAY->SetRenderTarget( m_iPreviousRenderTarget );
}

// lua start
#include "LuaBinding.h"

/** @brief Allow Lua to have access to the RageTextureRenderTarget. */ 
class LunaRageTextureRenderTarget: public Luna<RageTextureRenderTarget>
{
public:
	static int BeginRenderingTo( T* p, lua_State *L )
	{
		bool bPreserveTexture = !!luaL_opt( L, lua_toboolean, 1, false );
		p->BeginRenderingTo( bPreserveTexture );
		COMMON_RETURN_SELF;
	}
	static int FinishRenderingTo( T* p, lua_State *L )	{ p->FinishRenderingTo(); COMMON_RETURN_SELF; }

	LunaRageTextureRenderTarget()
	{
		ADD_METHOD( BeginRenderingTo );
		ADD_METHOD( FinishRenderingTo );
	}
};

LUA_REGISTER_DERIVED_CLASS( RageTextureRenderTarget, RageTexture )
// lua end

/*
 * Copyright (c) 2001-2006 Glenn Maynard, Chris Danford
 * All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, and/or sell copies of the Software, and to permit persons to
 * whom the Software is furnished to do so, provided that the above
 * copyright notice(s) and this permission notice appear in all copies of
 * the Software and that both the above copyright notice(s) and this
 * permission notice appear in supporting documentation.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
 * THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
 * INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
 * OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */