Intro to DirectX Part 4

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Intro to DirectX Part 4

• Putting it all together

Danny Dyer
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Information about these slides

• Companion to the more detailed slides available
  on the TAGD resources page.
• http//www.gettagd.com/resources.php
• You can find the page numbers that reference the
  other slides at the bottom right of these slides.

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Togetherness

• We learned about a bunch (or a few) different
  concepts, but how do we put them all together?
• Wouldnt it be cool if we could have a spinning
  textured cube with lighting ?!
• Just imagine the possibilities

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Back to Program Flow
WinMain() // done for you
begin
resources
acquire
OnResetDevice()
setup state
update
OnFrameMove()
render
render
OnFrameRender()
release
resources
OnLostDevice()
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fin
return 0 // done for you
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Acquire Get Resources

• //Declare our global variables at the top
• ID3DXMesh g_pMesh
• IDirect3DTexture9 g_pTexture
• // Called when our device is created or reset
• HRESULT CALLBACK OnResetDevice( IDirect3DDevice9
  pd3dDevice,
• const D3DSURFACE_DESC
  pBackBufferSurfaceDesc, void pUserContext )
• // load a mesh with normals
• D3DXLoadMeshFromX( boxmesh.x, D3DX_SYSTEMMEM,
  pd3dDevice, NULL,
• NULL, NULL, NULL, g_pMesh )
• // load our texture
• D3DXCreateTextureFromFile( pd3dDevice,
  L"texture.bmp", g_pTexture )

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Acquire Setup State

• HRESULT CALLBACK OnResetDevice( IDirect3DDevice9
  pd3dDevice,
• const D3DSURFACE_DESC
  pBackBufferSurfaceDesc, void pUserContext )
• // get resources
• // define our view matrix
• D3DXMATRIX view
• D3DXVECTOR3 eye(0,0,-5)
• D3DXVECTOR3 at(0,0,0)
• D3DXVECTOR3 up(0,1,0)
• D3DXMatrixLookAtLH(view, eye, at, up)
• // define our projection matrix
• D3DXMATRIX proj
• D3DXMatrixPerspectiveFovLH(proj, D3DX_PI /
  4.0f, 4.0f/ 3, 1.0f, 100.0f)
• // set these matrices to the device
• pd3dDevice-gtSetTransform(D3DTS_VIEW, view)
• pd3dDevice-gtSetTransform(D3DTS_PROJECTION,
  proj)

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setup_lighting()

• void setup_lighting()
• // Set the RGBA for diffuse reflection.
• D3DMATERIAL9 mat
• mat.Diffuse.r 0.0f
• mat.Diffuse.g 0.5f
• mat.Diffuse.b 1.0f
• mat.Diffuse.a 1.0f
• pd3dDevice-gtSetMaterial(mat)
• // Initialize the light.
• D3DLIGHT9 d3dLight
• ZeroMemory(d3dLight, sizeof(d3dLight))
• // Set up a white point light.
• d3dLight.Type D3DLIGHT_POINT
• d3dLight.Diffuse.r 1.0f
• d3dLight.Diffuse.g 1.0f
• d3dLight.Diffuse.b 1.0f

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Render

• void CALLBACK OnFrameRender( IDirect3DDevice9
  pd3dDevice, double fTime, float fElapsedTime,
  void pUserContext )
• HRESULT hr
• // Clear the render target and the zbuffer
• pd3dDevice-gtClear(0, NULL, D3DCLEAR_TARGET
  D3DCLEAR_ZBUFFER, D3DCOLOR_ARGB(0, 45, 50, 170),
  1.0f, 0)
• // Render the scene
• if( SUCCEEDED( pd3dDevice-gtBeginScene() ) )
• // set our texture
• pd3dDevice-gtSetTexture(0, g_pTexture)
• // update angle
• static float angle 0.0f
• angle fElapsedTime
• if(angle gt 2.0f D3DX_PI)
• angle 0.0f

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Release

• // Release all of our resources created in
  OnResetDevice()
• void CALLBACK OnLostDevice( void pUserContext )
• if( g_pTexture )
• g_pTexture-gtRelease()
• if( g_pMesh )
• g_pMesh-gtRelease()

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Thats it!

• Thats really all there is too it.
• Making DirectX applications is simple as long as
  you have a framework.

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What do you want next?

• Possible Topics
• Rendering Pipeline
• Shaders
• Vertex/Index Buffers
• Others??
• bovicide_at_gmail.com
• and remember kids, dont let directx get into
  the hands of those crummy bobsledders