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
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #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> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| // 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; | |
| }; |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| // ---- 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; | |
| } |