Using mipmaps with RT&#39;s in DirectX9

Using mipmaps with RT's in DirectX9

そら · 2012-05-21T14:30:28

Hi, I've been trying to create a texture as a RenderTarget, and I want to use mipmapping with that texture, so I create it with D3DUSAGE_RENDERTARGET | D3DUSAGE_AUTOGENERATEMIPMAP. However, doesn't matter if I explicitly tell it to use X number of mipmaps or not, or if I use GenerateMipSubLevels() at some point, it will always have only 1 level. I haven't found in the Doc's any information that DirectX9 does not support using mipmaps on a RT, however, I have google for any successfull case, and many have the same problem. The only diference is when people are using XNA, in which case it is possible, but XNA docs state that mipmapping on RT does not work on XB360.. which makes me believe that natively XNA does something to support mipmapping with RT's that it is not supported by default on DX9. Can anyone confirm this?... why does MSDN docs don't state that this is not possible?.. Thanks!

kubera

1,592

May 17, 2012 03:55 AM

Please conside using IE, i would help.

Hodgman

52,717

May 17, 2012 05:42 AM

looks like right now the only option is to get some confirmation by someone at Microsoft that this is really not possible

It is possible, I've done it before...
There's really only 4 places something can go wrong, so there's probably a small bug in your code in one of them:
* Create the resource.
* Bind the resource for writing.
* Bind the resource for sampling.
* Sample the resource.

I can't personally offer any more help/advice unless you post your code up, other then reiterating that PIX might be useful, and that you should enable the debug runtimes in the DirectX control panel to check for obvious errors.

. 22 Racing Series .

そら

477

Author

May 18, 2012 08:57 PM

Thanks Hodgman

I have taken the SDK's Vertex tutorial sample, and managed to reduce it to the following code to handle the most basic form of a mipmapped render target:



//-----------------------------------------------------------------------------

// File: Vertices.cpp

//

// Desc: In this tutorial, we are rendering some Vertices. This introduces the

//	   concept of the vertex buffer, a Direct3D object used to store

//	   Vertices. Vertices can be defined any way we want by defining a

//	   custom structure and a custom FVF (flexible vertex format). In this

//	   tutorial, we are using Vertices that are transformed (meaning they

//	   are already in 2D window coordinates) and lit (meaning we are not

//	   using Direct3D lighting, but are supplying our own colors).

//

// Copyright (c) Microsoft Corporation. All rights reserved.

//-----------------------------------------------------------------------------

#include <d3d9.h>

#pragma warning( disable : 4996 ) // disable deprecated warning

#include <strsafe.h>

#pragma warning( default : 4996 )

#include <d3dx9effect.h>



#define WWIDTH  640.0f

#define WHEIGHT 480.0f



#define DoSafeRelease( COM ) if( COM ){ COM->Release(); COM = NULL; }



//-----------------------------------------------------------------------------

// Global variables

//-----------------------------------------------------------------------------

LPDIRECT3D9			 g_pD3D = NULL; // Used to create the D3DDevice

LPDIRECT3DDEVICE9	   g_pd3dDevice = NULL; // Our rendering device

LPDIRECT3DVERTEXBUFFER9 g_pVB  = NULL; // Buffer to hold Vertices

LPDIRECT3DVERTEXBUFFER9 g_pVB2 = NULL; // Buffer to hold Vertices

LPDIRECT3DTEXTURE9  g_pRTTexture = NULL;

LPDIRECT3DSURFACE9  g_pFrontBuffer = NULL;

ID3DXEffect*   g_pEffect = NULL;

// A structure for our custom vertex type

struct CUSTOMVERTEX

{

	FLOAT x, y, z, rhw; // The transformed position for the vertex

	DWORD color;		// The vertex color

};

#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZRHW|D3DFVF_DIFFUSE)



struct CUSTOMTEXVERTEX

{

FLOAT x, y, z, rhw;

DWORD color;

FLOAT u, v;

};

#define D3DFVF_CUSTOMTEXVERTEX (D3DFVF_XYZRHW|D3DFVF_DIFFUSE|D3DFVF_TEX1)

//-----------------------------------------------------------------------------

// Name: InitD3D()

// Desc: Initializes Direct3D

//-----------------------------------------------------------------------------

HRESULT InitD3D( HWND hWnd )

{

HRESULT R;

	// Create the D3D object.

	if( NULL == ( g_pD3D = Direct3DCreate9( D3D_SDK_VERSION ) ) )

		return E_FAIL;

	// Set up the structure used to create the D3DDevice

	D3DPRESENT_PARAMETERS d3dpp;

	ZeroMemory( &amp;d3dpp, sizeof( d3dpp ) );

	d3dpp.Windowed = TRUE;

	d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;

	d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;

	// Create the D3DDevice

	if( FAILED( g_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,

									  D3DCREATE_SOFTWARE_VERTEXPROCESSING,

									  &amp;d3dpp, &amp;g_pd3dDevice ) ) )

	{

		return E_FAIL;

	}

R = g_pd3dDevice->GetBackBuffer(0,0,D3DBACKBUFFER_TYPE_MONO,&amp;g_pFrontBuffer);

if( FAILED(R) ) return R;

// Device state would normally be set here

R = g_pd3dDevice->CreateTexture(640,480,0,(D3DUSAGE_RENDERTARGET|D3DUSAGE_AUTOGENMIPMAP), D3DFMT_X8R8G8B8, D3DPOOL_DEFAULT,&amp;g_pRTTexture, NULL);

if( FAILED(R) ) return R;



LPD3DXBUFFER ErrBuffer;

D3DXCreateEffectFromFile( g_pd3dDevice, L".\\ReadLOD.fx", NULL, NULL, 0, NULL, &amp;g_pEffect, &amp;ErrBuffer );

if( !g_pEffect ) return E_FAIL;

	return S_OK;

}



//-----------------------------------------------------------------------------

// Name: InitVB()

//-----------------------------------------------------------------------------

HRESULT InitVB()

{

	// Initialize three Vertices for rendering a triangle

	CUSTOMVERTEX Vertices[] =

	{   // 640x480

		{ (WWIDTH*0.5f ), (WHEIGHT*0.05f), 0.5f, 1.0f, 0xffff0000, }, // x, y, z, rhw, color

		{ (WWIDTH*0.95f), (WHEIGHT*0.95f), 0.5f, 1.0f, 0xff00ff00, },

		{ (WWIDTH*0.05f), (WHEIGHT*0.95f), 0.5f, 1.0f, 0xff00ffff, },

	};

	// Create the vertex buffer. Here we are allocating enough memory

	// (from the default pool) to hold all our 3 custom Vertices. We also

	// specify the FVF, so the vertex buffer knows what data it contains.

	if( FAILED( g_pd3dDevice->CreateVertexBuffer( 3 * sizeof( CUSTOMVERTEX ),

												  0, D3DFVF_CUSTOMVERTEX,

												  D3DPOOL_DEFAULT, &amp;g_pVB, NULL ) ) )

	{

		return E_FAIL;

	}

	// Now we fill the vertex buffer. To do this, we need to Lock() the VB to

	// gain access to the Vertices. This mechanism is required becuase vertex

	// buffers may be in device memory.

	VOID* pVertices;

	if( FAILED( g_pVB->Lock( 0, sizeof( Vertices ), ( void** )&amp;pVertices, 0 ) ) )

		return E_FAIL;

	memcpy( pVertices, Vertices, sizeof( Vertices ) );

	g_pVB->Unlock();



CUSTOMTEXVERTEX Grid[] =

{

  {0.0f,   0.0f,   0.5f, 1.0f, 0xFFffFFff, 0.0f, 0.0f },

  {640.0f, 0.0f,   0.5f, 1.0f, 0xFFffFFff, 1.0f, 0.0f },

  {640.0f, 480.0f, 0.5f, 1.0f, 0xFFffFFff, 1.0f, 1.0f },

  {0.0f,   0.0f,   0.5f, 1.0f, 0xFFffFFff, 0.0f, 0.0f },

  {640.0f, 480.0f, 0.5f, 1.0f, 0xFFffFFff, 1.0f, 1.0f },

  {0.0f,   480.0f, 0.5f, 1.0f, 0xFFffFFff, 0.0f, 1.0f }

};

	if( FAILED( g_pd3dDevice->CreateVertexBuffer( 6 * sizeof( CUSTOMTEXVERTEX ),

												  0, D3DFVF_CUSTOMTEXVERTEX,

												  D3DPOOL_DEFAULT, &amp;g_pVB2, NULL ) ) )

	{

		return E_FAIL;

	}

	VOID* pGrid;

	if( FAILED( g_pVB2->Lock( 0, sizeof( Grid ), ( void** )&amp;pGrid, 0 ) ) )

		return E_FAIL;

	memcpy( pGrid, Grid, sizeof( Grid ) );

	g_pVB2->Unlock();

	return S_OK;

}



//-----------------------------------------------------------------------------

// Name: Cleanup()

// Desc: Releases all previously initialized objects

//-----------------------------------------------------------------------------

VOID Cleanup()

{

	if( g_pVB != NULL )

		g_pVB->Release();

	if( g_pd3dDevice != NULL )

		g_pd3dDevice->Release();

	if( g_pD3D != NULL )

		g_pD3D->Release();

if( g_pRTTexture != NULL )

  g_pRTTexture->Release();

if( g_pEffect != NULL )

  g_pEffect->Release();

}



//-----------------------------------------------------------------------------

// Name: Render()

// Desc: Draws the scene

//-----------------------------------------------------------------------------

VOID Render()

{

IDirect3DSurface9 *pRT = NULL;



/***************** Render into the g_RTTexture surface *****************/

g_pd3dDevice->SetTexture( 0, NULL );

g_pRTTexture->GetSurfaceLevel( 0, &amp;pRT);

g_pd3dDevice->SetRenderTarget( 0, pRT );

DoSafeRelease( pRT )

	// Clear the backbuffer to a blue color

	g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB( 128, 128, 128 ), 1.0f, 0 );

	// Begin the scene

	if( SUCCEEDED( g_pd3dDevice->BeginScene() ) )

	{

		g_pd3dDevice->SetStreamSource( 0, g_pVB, 0, sizeof( CUSTOMVERTEX ) );

		g_pd3dDevice->SetFVF( D3DFVF_CUSTOMVERTEX );

		g_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLELIST, 0, 1 );

		// End the scene

		g_pd3dDevice->EndScene();

	}

	// Present the backbuffer contents to the display

	g_pd3dDevice->Present( NULL, NULL, NULL, NULL );



/***************** Render into the Frame Buffer *****************/

g_pd3dDevice->SetRenderTarget(0,g_pFrontBuffer);

g_pRTTexture->GenerateMipSubLevels();

g_pd3dDevice->SetTexture( 0, g_pRTTexture );



	g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB( 225, 0, 225 ), 1.0f, 0 );

	// Begin the scene

	if( SUCCEEDED( g_pd3dDevice->BeginScene() ) )

	{

  UINT passes;

  g_pEffect->SetTechnique( "Render_LOD" );

  g_pEffect->Begin(&amp;passes,0);

  for( UINT i=0; i < passes; i++ )

  {

   g_pEffect->BeginPass( i );

   g_pd3dDevice->SetStreamSource( 0, g_pVB2, 0, sizeof( CUSTOMTEXVERTEX ) );

   g_pd3dDevice->SetFVF( D3DFVF_CUSTOMTEXVERTEX );

   g_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLELIST, 0, 2 );

   g_pEffect->EndPass();

  }

  g_pEffect->End();

		// End the scene

		g_pd3dDevice->EndScene();

	}

	// Present the backbuffer contents to the display

	g_pd3dDevice->Present( NULL, NULL, NULL, NULL );

}





//-----------------------------------------------------------------------------

// Name: MsgProc()

// Desc: The window's message handler

//-----------------------------------------------------------------------------

LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )

{

	switch( msg )

	{

		case WM_DESTROY:

			Cleanup();

			PostQuitMessage( 0 );

			return 0;

	}

	return DefWindowProc( hWnd, msg, wParam, lParam );

}



//-----------------------------------------------------------------------------

// Name: wWinMain()

// Desc: The application's entry point

//-----------------------------------------------------------------------------

INT WINAPI wWinMain( HINSTANCE hInst, HINSTANCE, LPWSTR, INT )

{

	UNREFERENCED_PARAMETER( hInst );

	// Register the window class

	WNDCLASSEX wc =

	{

		sizeof( WNDCLASSEX ), CS_CLASSDC, MsgProc, 0L, 0L,

		GetModuleHandle( NULL ), NULL, NULL, NULL, NULL,

		L"D3DLODRenderTarget", NULL

	};

	RegisterClassEx( &amp;wc );

	// Create the application's window

	HWND hWnd = CreateWindow( L"D3DLODRenderTarget", L"Test LOD on Render Target",

							  WS_OVERLAPPEDWINDOW, 100, 100, 658, 524,

							  NULL, NULL, wc.hInstance, NULL );

	// Initialize Direct3D

	if( SUCCEEDED( InitD3D( hWnd ) ) )

	{

		// Create the vertex buffer

		if( SUCCEEDED( InitVB() ) )

		{

			// Show the window

			ShowWindow( hWnd, SW_SHOWDEFAULT );

			UpdateWindow( hWnd );

			// Enter the message loop

			MSG msg;

			ZeroMemory( &amp;msg, sizeof( msg ) );

			while( msg.message != WM_QUIT )

			{

				if( PeekMessage( &amp;msg, NULL, 0U, 0U, PM_REMOVE ) )

				{

					TranslateMessage( &amp;msg );

					DispatchMessage( &amp;msg );

				}

				else

					Render();

			}

		}

	}

	UnregisterClass( L"D3DLODRenderTarget", wc.hInstance );

	return 0;

}

and for the PixelShader, this is the code:



sampler s;



float4 PS( float4 tex : TEXCOORD0 ) : COLOR

{

return tex2Dlod( s, float4( tex.xyz, 3 ) );

}

technique Render_LOD

{

pass P0

{

  PixelShader = compile ps_3_0 PS();

}

}

PIX doesn't really give me any useful information (except the fact that when creating the RT texture it doesn't take the D3DUSAGE_AUTOGENMIPMAP part, although it is explicitly created with it in the code).

Or am I missing something?

Thanks!

"lots of shoulddas, coulddas, woulddas in the air, thinking about things they shouldda couldda wouldda donne, however all those shoulddas coulddas woulddas ran away when they saw the little did to come"

unbird

8,359

May 19, 2012 12:43 PM

Yes, so did I until now. You don't explicitly set the mip filter of your sampler, so the default of D3DTEXF_NONE will be your culprit. Set it to linear or point.

そら

477

Author

May 21, 2012 02:30 PM

Really really thank you unbird!..

you are totalli right, I was almost convinced it was not possible, but now, after explictly setting the mip filter to point/linear it's doing it correctly.

thanks the three of you for your help!

"lots of shoulddas, coulddas, woulddas in the air, thinking about things they shouldda couldda wouldda donne, however all those shoulddas coulddas woulddas ran away when they saw the little did to come"

Using mipmaps with RT's in DirectX9

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