Render to texture problems.

[Enerjak 277]

I'm trying to render to texture using a screen quad and shaders but no matter what i try nothing works. I change one thing, i get D3DX helper errors but the application still runs although it spits out a ton of errors from Direct3D. I'm posting my code here to see if anyone knows what to do to get this to work.

Cor_Direct3D9Renderer* Renderer = new Cor_Direct3D9Renderer();
Screen_Quad* screen_quad;
IDirect3DTexture9* g_pRenderTexture = 0;
IDirect3DSurface9* g_pRenderTarget = 0;
IDirect3DSurface9* g_pRenderTarget_main = 0;
IDirect3DSurface9* back_buffer = 0;
ID3DXEffect* FullScreen = 0;
D3DXHANDLE tech;
ID3DXBuffer* errors;
IDirect3DDevice9* g_pDevice;
ID3DXRenderToSurface* Surface;
ID3DXMesh* g_pSphere;
CXModel* Box = new CXModel();
#define SCREEN_WIDTH 800
#define SCREEN_HEIGHT 600
int _tmain(int argc, _TCHAR* argv[])
{
	HWND g_pWindow = Renderer->CreateWindowDX("Screen Quads",0,0,SCREEN_WIDTH,SCREEN_HEIGHT);

	if(g_pWindow)
	{
		Renderer->CreateDirect3D(g_pWindow,SCREEN_WIDTH,SCREEN_HEIGHT,false,1,1,1);
		screen_quad = new Screen_Quad();
		g_pDevice = Renderer->GetDirect3DDevice9();
	}
	screen_quad->CreateQuad(g_pDevice,0,0,SCREEN_WIDTH,SCREEN_HEIGHT,1.0);
	if(!Box->LoadXModel(g_pDevice,"Model//Box.x"))
	{
		printf("Could not load model");
	}

	HRESULT HR = D3DXCreateEffectFromFileA(g_pDevice,"Shaders\\Screen_Effects.fx",0,0,0,0,&FullScreen,&errors);

	FullScreen->FindNextValidTechnique(0,&tech);
	if(FAILED(HR))
	{
		char shaderErrors[1024];
		sprintf(shaderErrors,"%d",errors->GetBufferPointer());
		MessageBoxA(NULL,(LPCSTR)shaderErrors,"Error",MB_OK);

	}
	g_pDevice->CreateRenderTarget(SCREEN_WIDTH,SCREEN_HEIGHT,D3DFMT_A32B32G32R32F,D3DMULTISAMPLE_NONE,1,false,&g_pRenderTarget,NULL);

	g_pDevice->CreateTexture(SCREEN_WIDTH,SCREEN_HEIGHT,10,D3DUSAGE_RENDERTARGET,D3DFMT_A32B32G32R32F,D3DPOOL_DEFAULT,&g_pRenderTexture,NULL);
	
	HR = D3DXCreateSphere(g_pDevice,50,20,20,&g_pSphere,NULL);

	HR = D3DXCreateRenderToSurface(g_pDevice,SCREEN_WIDTH,SCREEN_HEIGHT,D3DFMT_A32B32G32R32F,false,D3DFMT_D24S8,&Surface);

	if(FAILED(HR))
	{
		printf("Could not create Render To Surface");
	}
	if(FAILED(HR))
	{
		printf("Could not create Sphere");

	}
	
	while(Renderer->MessagePump(g_pWindow))
	{
	
		
		
	
		D3DVIEWPORT9 View;
		g_pDevice->GetViewport(&View);
		HR = Surface->BeginScene(g_pRenderTarget,&View);	
		g_pDevice->SetRenderTarget(0,g_pRenderTarget);	
		g_pDevice->Clear(0,0,D3DCLEAR_TARGET,D3DCOLOR_XRGB(0,0,255),1.0,1);
	
		if(FAILED(HR))
		{
			printf("Could not begin rendering to surface");
		}
		D3DXMATRIX pView;
		D3DXMATRIX pProj;
		D3DXMATRIX pWorld;
		D3DXMATRIX Result;
		D3DXMatrixLookAtLH(&pView,
			&D3DXVECTOR3(40,10,20),
			&D3DXVECTOR3(10,50,-100),
			&D3DXVECTOR3(0,1,0));


		D3DXMatrixPerspectiveFovLH(&pProj,45.0,1.3333,1.0, 10000.0);

		D3DXMatrixTranslation(&pWorld,0,0,0);

		Result = pView * pProj * pWorld;
		HR = FullScreen->SetMatrix("matViewProjection",&Result);
		if(FAILED(HR))
		{
			printf("Could not set vertex Shader Matrix");
		}
		FullScreen->Begin(0,0);
		FullScreen->BeginPass(0);
		FullScreen->CommitChanges();
		if(!Box->DrawXModel(g_pDevice))
		{
			printf("Could not draw model");
		}
		FullScreen->EndPass();
		FullScreen->End();
		HR = Surface->EndScene(0);
		if(FAILED(HR))
		{
			printf("Could not end screen rendering");
		}
		g_pDevice->BeginScene();
		
		g_pDevice->SetRenderTarget(0,g_pRenderTarget_main);
		g_pDevice->Clear(0,0,D3DCLEAR_TARGET,D3DCOLOR_XRGB(0,0,255),1.0,1);
		g_pRenderTexture->GetSurfaceLevel(1,&g_pRenderTarget);
		g_pDevice->GetBackBuffer(0,0,D3DBACKBUFFER_TYPE_MONO,&back_buffer);
		
		FullScreen->SetTexture("renderTexture_Tex",g_pRenderTexture);
		UINT Passes = 1;
		FullScreen->Begin(&Passes,0);
			FullScreen->BeginPass(1);
			FullScreen->CommitChanges();
		//g_pDevice->SetTexture(0,g_pRenderTexture);
		screen_quad->DrawQuad(g_pDevice);

			FullScreen->EndPass();
		FullScreen->End();
		
	
		g_pDevice->EndScene();
		g_pDevice->Present(NULL,NULL,NULL,NULL);	
	
		

	}
	return 0;
}

and here is what Direct3D tells me when the application runs.

D3D9 Helper: IDirect3DDevice9::SetRenderTarget failed: D3DERR_INVALIDCALL
Direct3D9: (WARN) :Can not render to a render target that is also used as a texture. A render target was detected as bound, but couldn't detect if texture was actually used in rendering.

Direct3D9: (ERROR) :Need to call BeginScene before rendering.

First-chance exception at 0x75f3f328 in FullScreen.exe: Microsoft C++ exception: long at memory location 0x0072efdc..
Direct3D9: (ERROR) :DrawIndexedPrimitive failed.

D3D9 Helper: IDirect3DDevice9::DrawIndexedPrimitive failed: D3DERR_INVALIDCALL
Direct3D9: (ERROR) :Illegal to set render target 0 to NULL

D3D9 Helper: IDirect3DDevice9::SetRenderTarget failed: D3DERR_INVALIDCALL
Direct3D9: (WARN) :Can not render to a render target that is also used as a texture. A render target was detected as bound, but couldn't detect if texture was actually used in rendering.

Direct3D9: (ERROR) :Need to call BeginScene before rendering.

and as you can see from my code i am calling BeginScene on the surface and on the back buffer. Hope someone knows how to get this to work as i want to be able to use shaders for post effects.

[Demirug 884]

You need to call g_pDevice->BeginScene() before you start to render to you surface. The BeginScene on the surface just prepare the surface to be used as target but it doesn’t prepare the device.

[Enerjak 277]

Ok, i changed the program around a little here it is:

Cor_Direct3D9Renderer* Renderer = new Cor_Direct3D9Renderer();
Screen_Quad* screen_quad;
IDirect3DTexture9* g_pRenderTexture = 0;
IDirect3DSurface9* g_pRenderTarget = 0;
IDirect3DSurface9* g_pRenderTarget_main = 0;
IDirect3DSurface9* back_buffer = 0;
IDirect3DTexture9* g_pTexture = 0;
ID3DXEffect* FullScreen = 0;
D3DXHANDLE tech;
ID3DXBuffer* errors;
IDirect3DDevice9* g_pDevice;
ID3DXRenderToSurface* Surface;
ID3DXMesh* g_pSphere;
CXModel* Box = new CXModel();
#define SCREEN_WIDTH 800
#define SCREEN_HEIGHT 600
int _tmain(int argc, _TCHAR* argv[])
{
	HWND g_pWindow = Renderer->CreateWindowDX("Screen Quads",0,0,SCREEN_WIDTH,SCREEN_HEIGHT);

	if(g_pWindow)
	{
		Renderer->CreateDirect3D(g_pWindow,SCREEN_WIDTH,SCREEN_HEIGHT,false,1,1,1);
		screen_quad = new Screen_Quad();
		g_pDevice = Renderer->GetDirect3DDevice9();
	}
	screen_quad->CreateQuad(g_pDevice,0,0,SCREEN_WIDTH,SCREEN_HEIGHT,1.0);
	if(!Box->LoadXModel(g_pDevice,"Model//Box.x"))
	{
		printf("Could not load model");
	}

	HRESULT HR = D3DXCreateEffectFromFileA(g_pDevice,"Shaders\\Screen_Effects.fx",0,0,0,0,&FullScreen,&errors);

	FullScreen->FindNextValidTechnique(0,&tech);
	if(FAILED(HR))
	{
		char shaderErrors[1024];
		sprintf(shaderErrors,"%d",errors->GetBufferPointer());
		MessageBoxA(NULL,(LPCSTR)shaderErrors,"Error",MB_OK);

	}
	g_pDevice->CreateRenderTarget(SCREEN_WIDTH,SCREEN_HEIGHT,D3DFMT_A32B32G32R32F,D3DMULTISAMPLE_NONE,1,false,&g_pRenderTarget,NULL);

	g_pDevice->CreateRenderTarget(SCREEN_WIDTH,SCREEN_HEIGHT,D3DFMT_A32B32G32R32F,D3DMULTISAMPLE_NONE,1,false,&g_pRenderTarget_main,NULL);

	g_pDevice->CreateTexture(SCREEN_WIDTH,SCREEN_HEIGHT,10,D3DUSAGE_RENDERTARGET,D3DFMT_A32B32G32R32F,D3DPOOL_DEFAULT,&g_pRenderTexture,NULL);
	
	HR = D3DXCreateSphere(g_pDevice,50,20,20,&g_pSphere,NULL);

	HR = D3DXCreateRenderToSurface(g_pDevice,SCREEN_WIDTH,SCREEN_HEIGHT,D3DFMT_A32B32G32R32F,true,D3DFMT_D24S8,&Surface);

	if(FAILED(HR))
	{
		printf("Could not create Render To Surface");
	}
	if(FAILED(HR))
	{
		printf("Could not create Sphere");

	}
	
	while(Renderer->MessagePump(g_pWindow))
	{
	
		
		
	
		HR = g_pDevice->Clear(0,0,D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER,D3DCOLOR_XRGB(0,255,0),1.0,1);
		if(FAILED(HR))
		{
			printf("Could not clear render target");
		}
		HR = g_pDevice->SetRenderTarget(1,g_pRenderTarget);	
		if(FAILED(HR))
		{
			printf("Could not set render target");
		} 

		HR = g_pDevice->BeginScene();;	
	
	
		if(FAILED(HR))
		{
			printf("Could not begin rendering to surface");
		}
	
		HR = g_pDevice->EndScene();

		if(FAILED(HR))
		{
			printf("Could not end screen rendering");
		}
		g_pDevice->BeginScene();	
		D3DXMATRIX pView;
		D3DXMATRIX pProj;
		D3DXMATRIX pWorld;
		D3DXMATRIX Result;
		D3DXMatrixLookAtLH(&pView,
			&D3DXVECTOR3(40,10,20),
			&D3DXVECTOR3(0,0,-200),
			&D3DXVECTOR3(0,1,0));


		D3DXMatrixPerspectiveFovLH(&pProj,45.0,1.3333,1.0, 10000.0);

		D3DXMatrixTranslation(&pWorld,0,0,0);

		Result = pView * pProj * pWorld;
		HR = FullScreen->SetMatrix("matViewProjection",&Result);
		if(FAILED(HR))
		{
			printf("Could not set vertex Shader Matrix");
		}
		HR = FullScreen->SetTexture("Coin_Tex",g_pTexture);
		if(FAILED(HR))
		{
			printf("Could not set texture");
		}
		//FullScreen->SetTexture("renderTexture_Tex",g_pRenderTexture);


		UINT Pass = 1;
		FullScreen->Begin(&Pass,0);
		FullScreen->BeginPass(0);
		FullScreen->CommitChanges();
		if(!Box->DrawXModel(g_pDevice))
		{
			printf("Could not draw model");
		}
		FullScreen->EndPass();
		FullScreen->End();
		HR = g_pDevice->GetBackBuffer(0,0,D3DBACKBUFFER_TYPE_MONO,&back_buffer);
		if(FAILED(HR))
		{
			printf("Could not get back buffer");
		}

		HR = g_pRenderTexture->GetSurfaceLevel(0,&g_pRenderTarget);
		if(FAILED(HR))
		{
			printf("Could not get surface level 0");
		}
		HR = g_pDevice->Clear(0,0,D3DCLEAR_TARGET | D3DCLEAR_STENCIL,D3DCOLOR_XRGB(255,0,0),1.0,1);
		if(FAILED(HR))
		{
			printf("Could not clear target");
		}
		HR = g_pDevice->SetRenderTarget(2,g_pRenderTarget_main);
		if(FAILED(HR))
		{
			printf("Could not set render target");
		}
		HR = FullScreen->SetTexture("renderTexture_Tex",g_pRenderTexture);
		if(FAILED(HR))
		{
			printf("Could not set render texture");
		}
		UINT Passes = 0;
		FullScreen->Begin(&Passes,0);
			FullScreen->BeginPass(1);
			FullScreen->CommitChanges();
		
			//g_pDevice->SetTexture(0,g_pRenderTexture);
		screen_quad->DrawQuad(g_pDevice);

			FullScreen->EndPass();
		FullScreen->End();
		
	
		g_pDevice->EndScene();
		g_pDevice->Present(NULL,NULL,NULL,NULL);	
	
		

	}
	g_pDevice->Release();
	g_pRenderTarget->Release();
	g_pRenderTarget_main->Release();
	g_pRenderTexture->Release();
	g_pSphere->Release();
	g_pTexture->Release();
	return 0;
}

as you can see, i'm clearing the first render target to one color (which doesn't seem to be working as i get a screen full of random colors) and i don't see anything. what am i doing wrong now?