| 1 | @ vim:filetype=armasm |
| 2 | |
| 3 | @ test |
| 4 | .global flushcache @ beginning_addr, end_addr, flags |
| 5 | |
| 6 | flushcache: |
| 7 | swi #0x9f0002 |
| 8 | mov pc, lr |
| 9 | |
| 10 | |
| 11 | .global block_or @ void *src, size_t n, int pat |
| 12 | |
| 13 | block_or: |
| 14 | stmfd sp!, {r4-r5} |
| 15 | orr r2, r2, r2, lsl #8 |
| 16 | orr r2, r2, r2, lsl #16 |
| 17 | mov r1, r1, lsr #4 |
| 18 | block_loop_or: |
| 19 | ldmia r0, {r3-r5,r12} |
| 20 | subs r1, r1, #1 |
| 21 | orr r3, r3, r2 |
| 22 | orr r4, r4, r2 |
| 23 | orr r5, r5, r2 |
| 24 | orr r12,r12,r2 |
| 25 | stmia r0!, {r3-r5,r12} |
| 26 | bne block_loop_or |
| 27 | ldmfd sp!, {r4-r5} |
| 28 | bx lr |
| 29 | |
| 30 | |
| 31 | .global block_andor @ void *src, size_t n, int andpat, int orpat |
| 32 | |
| 33 | block_andor: |
| 34 | stmfd sp!, {r4-r6} |
| 35 | orr r2, r2, r2, lsl #8 |
| 36 | orr r2, r2, r2, lsl #16 |
| 37 | orr r3, r3, r3, lsl #8 |
| 38 | orr r3, r3, r3, lsl #16 |
| 39 | mov r1, r1, lsr #4 |
| 40 | block_loop_andor: |
| 41 | ldmia r0, {r4-r6,r12} |
| 42 | subs r1, r1, #1 |
| 43 | and r4, r4, r2 |
| 44 | orr r4, r4, r3 |
| 45 | and r5, r5, r2 |
| 46 | orr r5, r5, r3 |
| 47 | and r6, r6, r2 |
| 48 | orr r6, r6, r3 |
| 49 | and r12,r12,r2 |
| 50 | orr r12,r12,r3 |
| 51 | stmia r0!, {r4-r6,r12} |
| 52 | bne block_loop_andor |
| 53 | ldmfd sp!, {r4-r6} |
| 54 | bx lr |
| 55 | |
| 56 | |
| 57 | .global spend_cycles @ c |
| 58 | |
| 59 | spend_cycles: |
| 60 | mov r0, r0, lsr #2 @ 4 cycles/iteration |
| 61 | sub r0, r0, #2 @ entry/exit/init |
| 62 | .sc_loop: |
| 63 | subs r0, r0, #1 |
| 64 | bpl .sc_loop |
| 65 | |
| 66 | bx lr |
| 67 | |
| 68 | |
| 69 | .global soft_scale @ void *dst, unsigned short *pal, int offs, int lines |
| 70 | |
| 71 | soft_scale: |
| 72 | stmfd sp!,{r4-r11,lr} |
| 73 | mov lr, #0xff |
| 74 | mov lr, lr, lsl #1 |
| 75 | mov r9, #0x3900 @ f800 07e0 001f | e000 0780 001c | 3800 01e0 0007 |
| 76 | orr r9, r9, #0x00e7 |
| 77 | |
| 78 | mov r11,r3 @ r11= line counter |
| 79 | mov r3, r1 @ r3 = pal base |
| 80 | |
| 81 | mov r12,#320 |
| 82 | mul r2, r12,r2 |
| 83 | add r4, r0, r2, lsl #1 @ r4 = dst_start |
| 84 | add r5, r0, r2 @ r5 = src_start |
| 85 | mul r12,r11,r12 |
| 86 | add r0, r4, r12,lsl #1 @ r0 = dst_end |
| 87 | add r1, r5, r12 @ r1 = src_end |
| 88 | |
| 89 | soft_scale_loop: |
| 90 | sub r1, r1, #64 @ skip borders |
| 91 | mov r2, #256/8 |
| 92 | |
| 93 | soft_scale_loop_line: |
| 94 | ldr r12, [r1, #-8]! |
| 95 | ldr r7, [r1, #4] |
| 96 | |
| 97 | and r4, lr, r12,lsl #1 |
| 98 | ldrh r4, [r3, r4] |
| 99 | and r5, lr, r12,lsr #7 |
| 100 | ldrh r5, [r3, r5] |
| 101 | and r4, r4, r9, lsl #2 |
| 102 | orr r4, r4, r4, lsl #14 @ r4[31:16] = 1/4 pix_s 0 |
| 103 | and r5, r5, r9, lsl #2 |
| 104 | sub r6, r5, r5, lsr #2 @ r6 = 3/4 pix_s 1 |
| 105 | add r4, r4, r6, lsl #16 @ pix_d 0, 1 |
| 106 | and r6, lr, r12,lsr #15 |
| 107 | ldrh r6, [r3, r6] |
| 108 | and r12,lr, r12,lsr #23 |
| 109 | ldrh r12,[r3, r12] |
| 110 | and r6, r6, r9, lsl #2 |
| 111 | add r5, r5, r6 |
| 112 | mov r5, r5, lsr #1 |
| 113 | sub r6, r6, r6, lsr #2 @ r6 = 3/4 pix_s 2 |
| 114 | orr r5, r5, r6, lsl #16 |
| 115 | |
| 116 | and r6, lr, r7, lsl #1 |
| 117 | ldrh r6, [r3, r6] |
| 118 | and r12,r12,r9, lsl #2 |
| 119 | add r5, r5, r12,lsl #14 @ pix_d 2, 3 |
| 120 | and r6, r6, r9, lsl #2 |
| 121 | orr r6, r12,r6, lsl #16 @ pix_d 4, 5 |
| 122 | |
| 123 | and r12,lr, r7, lsr #7 |
| 124 | ldrh r12,[r3, r12] |
| 125 | and r10,lr, r7, lsr #15 |
| 126 | ldrh r10,[r3, r10] |
| 127 | and r12,r12,r9, lsl #2 |
| 128 | sub r8, r12,r12,lsr #2 @ r8 = 3/4 pix_s 1 |
| 129 | add r8, r8, r6, lsr #18 |
| 130 | and r7, lr, r7, lsr #23 |
| 131 | ldrh r7, [r3, r7] |
| 132 | and r10,r10,r9, lsl #2 |
| 133 | orr r8, r8, r10,lsl #15 |
| 134 | add r8, r8, r12,lsl #15 @ pix_d 6, 7 |
| 135 | sub r10,r10,r10,lsr #2 @ r10= 3/4 pix_s 2 |
| 136 | and r7, r7, r9, lsl #2 |
| 137 | add r10,r10,r7, lsr #2 @ += 1/4 pix_s 3 |
| 138 | orr r10,r10,r7, lsl #16 @ pix_d 8, 9 |
| 139 | |
| 140 | subs r2, r2, #1 |
| 141 | |
| 142 | stmdb r0!, {r4,r5,r6,r8,r10} |
| 143 | bne soft_scale_loop_line |
| 144 | |
| 145 | subs r11,r11,#1 |
| 146 | bne soft_scale_loop |
| 147 | |
| 148 | ldmfd sp!,{r4-r11,lr} |
| 149 | bx lr |
| 150 | |
| 151 | |
| 152 | /* buggy and slow, probably because function call overhead |
| 153 | @ renderer helper, based on bitbank's method |
| 154 | .global draw8pix @ uint8 *P, uint8 *C, uint8 *PALRAM @ dest, src, pal |
| 155 | |
| 156 | draw8pix: |
| 157 | stmfd sp!, {r4,r5} |
| 158 | |
| 159 | ldrb r3, [r1] @ get bit 0 pixels |
| 160 | mov r12,#1 |
| 161 | orr r12,r12,r12,lsl #8 |
| 162 | orr r12,r12,r12,lsl #16 |
| 163 | ldrb r1, [r1, #8] @ get bit 1 pixels |
| 164 | orr r3, r3, r3, lsl #9 @ shift them over 1 byte + 1 bit |
| 165 | orr r3, r3, r3, lsl #18 @ now 4 pixels take up 4 bytes |
| 166 | and r4, r12,r3, lsr #7 @ mask off the upper nibble pixels we want |
| 167 | and r5, r12,r3, lsr #3 @ mask off the lower nibble pixels we want |
| 168 | ldr r2, [r2] |
| 169 | |
| 170 | orr r1, r1, r1, lsl #9 @ process the bit 1 pixels |
| 171 | orr r1, r1, r1, lsl #18 |
| 172 | and r3, r12,r1, lsr #7 @ mask off the upper nibble pixels we want |
| 173 | and r1, r12,r1, lsr #3 @ mask off the lower nibble |
| 174 | orr r4, r4, r3, lsl #1 |
| 175 | orr r5, r5, r1, lsl #5 |
| 176 | |
| 177 | @ can this be avoided? |
| 178 | mov r4, r4, lsl #3 @ *8 |
| 179 | mov r3, r2, ror r4 |
| 180 | strb r3, [r0], #1 |
| 181 | mov r4, r4, lsr #8 |
| 182 | mov r3, r2, ror r4 |
| 183 | strb r3, [r0], #1 |
| 184 | mov r4, r4, lsr #8 |
| 185 | mov r3, r2, ror r4 |
| 186 | strb r3, [r0], #1 |
| 187 | mov r4, r4, lsr #8 |
| 188 | mov r3, r2, ror r4 |
| 189 | strb r3, [r0], #1 |
| 190 | |
| 191 | mov r5, r5, lsl #3 @ *8 |
| 192 | mov r3, r2, ror r5 |
| 193 | strb r3, [r0], #1 |
| 194 | mov r5, r5, lsr #8 |
| 195 | mov r3, r2, ror r5 |
| 196 | strb r3, [r0], #1 |
| 197 | mov r5, r5, lsr #8 |
| 198 | mov r3, r2, ror r5 |
| 199 | strb r3, [r0], #1 |
| 200 | mov r5, r5, lsr #8 |
| 201 | mov r3, r2, ror r5 |
| 202 | strb r3, [r0], #1 |
| 203 | |
| 204 | ldmfd sp!, {r4,r5} |
| 205 | bx lr |
| 206 | */ |
| 207 | |