1 texture, many tiles?

CheapBastard · 2003-06-18T17:12:18

I''m working along with a book (Sams Teach Yourself Game Programming with DirectX in 21 Days... Hey, it works) to create a topdown 2d style rpg, much like the old Ultima (so the book claims), and the Final Fantasy games. That means it''s using tiles, which brings me to my question. The way the book creates the ''world view'' is by having one image with 64 tiles, load it as a surface, and display the right tile according to the map. That works fine for me, except it''s not very ncie to have trees, chests, people, ... with black background rather than the ''real'' background. Now the player''s a seperate image file, and a seperate drawing sequence, so adapting transparancy there was easy. However, trees, people, and so on is not that easy. They don''t have their own image, for like the background tiles they''re packed into one file (the book said it was more efficient, so it''s good practice to do that to the foreground tiles as well). So, in short, here''s what i''m having problems with: displaying (for example) the rectangle 0,160,40,200 (with a 40x40 tile, top left bottom right) from say a 40x320 image. Here''s some excerpts of code relevant to the problem: // load image file hResult = D3DXCreateTextureFromFileEx(m_pD3DDevice, "Graphics\\ftiles.bmp", D3DX_DEFAULT, D3DX_DEFAULT, 1, 0, D3DFMT_A8R8G8B8, D3DPOOL_MANAGED, D3DX_DEFAULT, D3DX_DEFAULT, 0xFF000000, NULL, NULL, &m_pFTileSurface); if(FAILED(hResult)){ strcpy(m_szErrorMsg, "Error loading foreground texture."); return hResult; } // place texture function, places a tile from the texture onto the backbuffer... Well, it should anyway m_Direct3D.SetVertices(DstCol,DstRow); m_Direct3D.GetDevice()->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_SELECTARG1); m_Direct3D.GetDevice()->SetTextureStageState(0, D3DTSS_COLORARG1, D3DTA_TEXTURE); m_Direct3D.GetDevice()->SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_SELECTARG1); m_Direct3D.GetDevice()->SetTextureStageState(0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE); m_Direct3D.GetDevice()->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA); m_Direct3D.GetDevice()->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA); m_Direct3D.GetDevice()->SetRenderState(D3DRS_ALPHABLENDENABLE, TRUE); m_Direct3D.GetDevice()->SetVertexShader(D3DFVF_XYZRHW|D3DFVF_TEX1); m_Direct3D.GetDevice()->SetStreamSource(0, m_Direct3D.GetVertexBuffer(),sizeof(CUSTOMVERTEX)); m_Direct3D.GetDevice()->SetTexture(0, m_Direct3D.GetFTileSurface()); if(SUCCEEDED(m_Direct3D.GetDevice()->BeginScene())){ m_Direct3D.GetDevice()->DrawPrimitive(D3DPT_TRIANGLELIST,0,2); m_Direct3D.GetDevice()->EndScene(); } by the way, is it a waste or not to do all that stuff each texture that needs to be placed? Thanks

For Beginners

Started by CheapBastard June 16, 2003 06:16 PM

13 comments, last by CheapBastard 20 years, 10 months ago

ultim

122

June 17, 2003 04:17 PM

there is a good tutorial about using transparencies with d3d at www.directx4vb.com. the tutoial is for VisualBasic developers but the dx calls and the theory are the same for c++ as well. the tutorial is under the tutorials/directx8/graphics section

CheapBastard

122

Author

June 18, 2003 03:47 PM

quite a good tutorial, albeit for VB, not for C++ (guess i should have specific that).

But my transparancy works fine, great, not even the slightest prob there.

What i want to do is just take a certain area from the texture (aka, not the entire texture) and copy it onto the backbuffer.

If only I knew now what I knew not tomorrow...

If only I knew now what I knew not tomorrow...

Thunder_Hawk

314

June 18, 2003 04:22 PM

You could also use a predetermined color to represent transparent sections in a 24-bit file. Then, at load time, you can convert the raw data into an appropriate format. After all, you''re probably not planning to use the entirety of those extra 8-bits for each pixel.

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CheapBastard

122

Author

June 18, 2003 04:43 PM

RGB: 0,0,0 (pure black) has been selected for transparancy, and i was planning on using more than 16bit color...
Like i mentioned before, the transparency works great, awesome even.

What i want to do is just take a certain area from the texture (aka, not the entire texture) and copy it onto the backbuffer.

If only I knew now what I knew not tomorrow...

If only I knew now what I knew not tomorrow...

Anonymous

June 18, 2003 05:12 PM

what you have to do is adjust the texture coordinates of the quad''s verts, depending upon which piece of the texture you want rendered for the next drawprimitive call. you can do this by either mucking with the vertex data directly or by using a texture transformation via setrenderstate calls.

1 texture, many tiles?

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