Gered
62af8575c6
- rename standard integer types to a more familiar (u)int(8/16/32) - many function/struct renames. i don't _really_ know if what i've done for this is better, but it "feels" better to me. many draw/blit function names are shorter which is nice, at least. kinda important to me because i develop this on a real DOS machine in 80x50 text mode. - add 'extern "C"' blocks to headers for C++ compiler usage - draw/pixel color value arguments for functions should all have been changed to be uint8 instead of a full 32-bit int. feels right, but maybe should've left alone... - small fix to keyboard handler. noticed a problem on one thinkpad laptop. was a result of what i think was a typo in a constant value used during the part of the interrupt handler that tells the keyboard controller the key event was processed - fix uncommon potential crash function return in draw_filled_rect - renamed low-level "direct" assembly functions to "lowlevel_xxx" to be a little bit more explicit about what they are - add some convenience event helper functions for determining event types - add fixed point atan2 - fixed some tabs/spaces inconsistences (should all be spaces now?) - maybe some other minor things i've forgotten
38 lines
618 B
C
Executable file
38 lines
618 B
C
Executable file
#include "dglfixp.h"
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fixed fix_sqrt(fixed x) {
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int32 t, q, b, r;
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r = x;
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b = 0x40000000;
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q = 0;
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while (b > 0x40) {
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t = q + b;
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if (r >= t) {
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r -= t;
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q = t + b;
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}
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r <<= 1;
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b >>= 1;
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}
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q >>= 8;
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return q;
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}
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fixed fix_atan2(fixed y, fixed x) {
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fixed absY, mask, angle, r, r3;
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mask = (y >> (sizeof(fixed)*8-1));
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absY = (y + mask) ^ mask;
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if (x >= 0) {
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r = fix_div(x - absY, x + absY);
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} else {
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r = fix_div(x + absY, absY - x);
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}
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return 0;
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}
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