annotate INSTALL @ 1544:ab1e4c41ab71

Fixed bug #33 Mike Frysinger wrote: > with libsdl-1.2.9, some games (like bomberclone) started > segfaulting in Gentoo [...snip...] > the last change in the last hunk: [...snip...] > if i change the statement to read: > (table[which].blit_features & GetBlitFeatures()) == GetBlitFeatures() > bomberclone no longer segfaults on my box Alex Volkov wrote: > The test "(table[which].blit_features & GetBlitFeatures()) == > table[which].blit_features)" is correct, and the previous > "(table[which].cpu_mmx == SDL_HasMMX())" was actually broken. I think there is potentially a slightly different cause of the above problem. During the introduction of the Altivec code, the blit_table struct field 'alpha' got changed from a straightforward enum to a bitmask, which makes perfect sense by itself. However, now the table driven blitter selection code in SDL_CalculateBlitN() can choose the wrong blitters when searching for a NO_ALPHA blitter because of the following code: int a_need = 0; ... (a_need & table[which].alpha) == a_need && When searching through the normal_blit_2[] table, a SET_ALPHA blitter (like Blit_RGB565_ARGB8888) can now be selected instead of a NO_ALPHA one, causing alpha channel bits to appear in a non-alpha destination surface. I suppose this could theoretically be an indirect cause of the segfault mentioned above. I *think* this can be fixed by changing to int a_need = NO_ALPHA;
author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 15:47:49 +0000
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2 To compile and install SDL:
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4 1. Run './configure; make; make install'
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6 If you are compiling for Windows using gcc, read the FAQ at:
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7 http://www.libsdl.org/faq.php?action=listentries&category=4#42
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9 If you are compiling using Visual C++ on Win32, you should read
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10 the file VisualC.html
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11
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12 2. Look at the example programs in ./test, and check out the HTML
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13 documentation in ./docs to see how to use the SDL library.
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15 3. Join the SDL developer mailing list by sending E-mail to
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16 sdl-request@libsdl.org
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17 and put "subscribe" in the subject of the message.
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19 Or alternatively you can use the web interface:
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20 http://www.libsdl.org/mailing-list.php
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22 That's it!
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23 Sam Lantinga <slouken@libsdl.org>