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bengaltgrs

Screen-Sized quad

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I've written some post processing shaders, but cannot seem to get the quad I render to, to be the exact size of the screen. I am using this as of now:
D3DXCreateMeshFVF(2, 4, D3DXMESH_MANAGED, Vertex::FVF, D3DDevice, &PPBillboardMesh);

Vertex* v = 0;
PPBillboardMesh->LockVertexBuffer(0, (void**)&v);

float WidthOffset = (ScreenHeight/ScreenWidth) * 0.885f;

v[0] = Vertex(-WidthOffset, -0.5f, 1.2f, 0.0f, 1.0f);
v[1] = Vertex(-WidthOffset,  0.5f, 1.2f, 0.0f, 0.0f);
v[2] = Vertex( WidthOffset,  0.5f, 1.2f, 1.0f, 0.0f);
v[3] = Vertex( WidthOffset, -0.5f, 1.2f, 1.0f, 1.0f);

PPBillboardMesh->UnlockVertexBuffer();

WORD* i = 0;
PPBillboardMesh->LockIndexBuffer(0, (void**)&i);

i[0] = 0; i[1] = 1; i[2] = 2;
i[3] = 0; i[4] = 2; i[5] = 3;

PPBillboardMesh->UnlockIndexBuffer();

And just billboard it to face the camera. This gets close, but not quite the right size. How do I go about creating the correct size quad? -Chris

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Here is code that I am using in AG :


bool Renderer::RenderQuad()
{
D3DSURFACE_DESC pdesc;
DXCALL( mFrame.mpBackBuffer->GetDesc( &pdesc ) );

FilterVertex fv[ 4 ];

fv[ 0 ].x = -0.5f;
fv[ 0 ].y = -0.5f;

fv[ 1 ].x = (float32)( pdesc.Width ) -0.5f;
fv[ 1 ].y = -0.5f;

fv[ 2 ].x = (float32)( pdesc.Width ) -0.5f;
fv[ 2 ].y = (float32)( pdesc.Height )-0.5f;

fv[ 3 ].x = -0.5f;
fv[ 3 ].y = (float32)( pdesc.Height )-0.5f;

fv[ 0 ].uv0[ 0 ] = 0.0f;
fv[ 0 ].uv0[ 1 ] = 1.0f;
fv[ 0 ].uv1[ 0 ] = 0.0f;
fv[ 0 ].uv1[ 1 ] = 1.0f;

fv[ 1 ].uv0[ 0 ] = 1.0f;
fv[ 1 ].uv0[ 1 ] = 1.0f;
fv[ 1 ].uv1[ 0 ] = 1.0f;
fv[ 1 ].uv1[ 1 ] = 1.0f;

fv[ 2 ].uv0[ 0 ] = 1.0f;
fv[ 2 ].uv1[ 0 ] = 1.0f;
fv[ 2 ].uv1[ 1 ] = 0.0f;
fv[ 2 ].uv0[ 1 ] = 0.0f;

fv[ 3 ].uv0[ 0 ] = 0.0f;
fv[ 3 ].uv0[ 1 ] = 0.0f;
fv[ 3 ].uv1[ 0 ] = 0.0f;
fv[ 3 ].uv1[ 1 ] = 0.0f;

mpDevice->SetVertexShader( 0 );

mpDevice->SetFVF( FilterVertex::FVF );

mpDevice->SetVertexDeclaration( mpFilterDecl );

DXCALL( mpDevice->DrawPrimitiveUP( D3DPT_TRIANGLEFAN, 2, &( fv[ 0 ] ), sizeof( FilterVertex ) ) );

return true;
}


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Thanks for the help guys, I got it now. Kind of a simple mistake actually.

SimmerD - I noticed you have Los Gatos there, do you work for Cryptic? I was actually born and raised there so it caught my eye.

-Chris

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Nope, I started my own game company. Right now I work in Sunnyvale, but I will probably be working at home starting next month, as my partner is moving to Denver, so there's not much point in maintaining an office...

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And here I was begining to think I was the only game developer in Los Gatos. Anyway, good luck with the company, the screenshots in your journal are very impressive.

-Chris

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