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1 | /* |
2 | * (C) GraÅžvydas "notaz" Ignotas, 2011 |
3 | * |
4 | * This work is licensed under the terms of GNU GPL, version 2 or later. |
5 | * See the COPYING file in the top-level directory. |
6 | */ |
7 | |
8 | |
9 | .text |
10 | .align 2 |
11 | |
12 | @ in: r0=dst, r2=pal, r12=0x1e |
13 | @ trashes r6-r8,lr,flags |
14 | .macro do_4_pixels rs ibase obase |
15 | .if \ibase - 1 < 0 |
16 | and r6, r12, \rs, lsl #1 |
17 | .else |
18 | and r6, r12, \rs, lsr #\ibase-1 |
19 | .endif |
20 | and r7, r12, \rs, lsr #\ibase+3 |
21 | and r8, r12, \rs, lsr #\ibase+7 |
22 | and lr, r12, \rs, lsr #\ibase+11 |
23 | ldrh r6, [r2, r6] |
24 | ldrh r7, [r2, r7] |
25 | ldrh r8, [r2, r8] |
26 | ldrh lr, [r2, lr] |
27 | tst r6, r6 |
28 | strneh r6, [r0, #\obase+0] |
29 | tst r7, r7 |
30 | strneh r7, [r0, #\obase+2] |
31 | tst r8, r8 |
32 | strneh r8, [r0, #\obase+4] |
33 | tst lr, lr |
34 | strneh lr, [r0, #\obase+6] |
35 | .endm |
36 | |
37 | .global draw_spr16_full @ (u16 *d, void *s, u16 *pal, int lines) |
38 | draw_spr16_full: |
39 | stmfd sp!, {r4-r8,lr} |
40 | mov r12, #0x1e @ empty pixel |
41 | |
42 | 0: |
43 | ldmia r1, {r4,r5} |
44 | do_4_pixels r4, 0, 0 |
45 | do_4_pixels r4, 16, 8 |
46 | do_4_pixels r5, 0, 16 |
47 | do_4_pixels r5, 16, 24 |
3609c474 |
48 | subs r3, r3, #1 |
49 | add r0, r0, #2048 |
50 | add r1, r1, #2048 |
b3db9409 |
51 | bgt 0b |
52 | |
53 | ldmfd sp!, {r4-r8,pc} |
54 | |
55 | @ vim:filetype=armasm |