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| [a5] One time Render to Target Bitmap then display Bitmap?(ex. Background Img) |
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Phrasz
Member #10,091
August 2008
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Sorry to bug you all with such a n00bish question. (It's late... my brain isn't working) I haven't looked at doing this since 4.2, but I used to generate a background or a static image (ex. A Chess/Checkers board) and then print that bitmap to the display vs. re-rendering each time. 1) How would I go about this in A5? Example thoughts: 1int Rendered_Gameboard=0;
2ALLEGRO_DISPLAY *display;
3ALLEGRO_BITMAP *bg, *tile1, *tile2;
4...
5//Load BitMaps: al_load_bitmap(filename);
6...
7//Select target bitmap?
8while(RunGame){
9 if(!Rendered_Gameboard){
10 al_set_target_bitmap(bg);
11 // RENDER GAMEBOARD with tile1 and tile2
12 Rendered_Gameboard=1;
13 // Need to do something like al_flip()?
14 al_set_target_backbuffer(display);
15 }
16 al_draw_bitmap(bg, 0, 0, 0);
17}
2) Also can I grab the current "screen" and save it as a bitmap? Thanks in Advance!
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Arthur Kalliokoski
Second in Command
February 2005
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They all watch too much MSNBC... they get ideas. |
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Thomas Fjellstrom
Member #476
June 2000
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Phrasz said: 1) How would I go about this in A5? you'd create a bitmap, call al_set_target_bitmap, draw using allegro's api, then set the target back to the display's backbuffer. Quote: 2) Also can I grab the current "screen" and save it as a bitmap? If you mean your ALLEGRO_DISPLAY I think so yes. If you mean the actual screen, including the windows desktop and other apps, allegro doesn't support that. -- |
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Phrasz
Member #10,091
August 2008
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Arthur thanks for that code. I was wondering about screen shots, so now it's Bookmarked Thomas: Thanks! 1) It looks like I am not completely lost! 2) I do mean the allegro display. Would I use the clipping functions? To clip the display to a bitmap?
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Thomas Fjellstrom
Member #476
June 2000
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Quote: Would I use the clipping functions? [alleg.sourceforge.net] To clip the display to a bitmap? Nope. Allegro, and the underlying 3D HW acceleration APIs have the concept of a render target. All you have to do is change the target of rendering to the new bitmap, and any rendering happens to it, rather than the display. -- |
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Phrasz
Member #10,091
August 2008
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To summarize: Save it to a bitmap before you ship it to the display. Got it! Edit: Thanks again.... still have to try it out.
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Thomas Fjellstrom
Member #476
June 2000
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Phrasz said: To summarize: Save it to a bitmap before you ship it to the display. I thought that's what you asked. You wanted to know how to draw to a bitmap, I told you. Now if you mean al_save_bitmap when you say "Save", no you don't need to do that. -- |
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Phrasz
Member #10,091
August 2008
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Ha. Now I am just being confusing. It's is what I asked. The 2nd case above was bass ackwards to what makes conventional sense. It's more of a case that I write a bunch on bit maps to display, and THEN decide to capture that as a bitmap. (Whereas you proposed/told to simply write to the bitmap first.) I guess the 2nd case is akin to "Print Screen" which is then stored in a buffer. However, it's irrelevant IF you simply draw to a bitmap in the first place.
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