Mattias Gustavsson mattiasgustavsson
💾
datenwolf
/ xcb_shmimg.c
Created
March 28, 2025 22:36
minimal example of using XCB to set up a framebuffer to draw to an X11 window
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| #include <stdlib.h> | |
| #include <stdio.h> | |
| #include <sys/ipc.h> | |
| #include <sys/shm.h> | |
| #include <xcb/xcb.h> | |
| #include <xcb/shm.h> | |
| #include <xcb/xcb_image.h> |
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| // ref: http://www.codercorner.com/RadixSortRevisited.htm | |
| // http://stereopsis.com/radix.html | |
| // int/float: https://github.com/lshamis/FloatRadixSort | |
| // string: https://github.com/rantala/string-sorting/blob/master/src/msd_ce.cpp | |
| struct str { | |
| const char *str; | |
| const char *end; | |
| int len; | |
| }; |
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| // ---- triangle rasterizer | |
| #define SUBPIXEL_SHIFT 8 | |
| #define SUBPIXEL_SCALE (1 << SUBPIXEL_SHIFT) | |
| static RADINLINE S64 det2x2(S32 a, S32 b, S32 c, S32 d) | |
| { | |
| S64 r = (S64) a*d - (S64) b*c; | |
| return r >> SUBPIXEL_SHIFT; | |
| } |