17913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang@ Tremolo library 22da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@----------------------------------------------------------------------- 32da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ Copyright (C) 2002-2009, Xiph.org Foundation 42da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ Copyright (C) 2010, Robin Watts for Pinknoise Productions Ltd 52da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ All rights reserved. 62da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang 72da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ Redistribution and use in source and binary forms, with or without 82da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ modification, are permitted provided that the following conditions 92da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ are met: 102da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang 112da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ * Redistributions of source code must retain the above copyright 122da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ notice, this list of conditions and the following disclaimer. 132da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ * Redistributions in binary form must reproduce the above 142da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ copyright notice, this list of conditions and the following disclaimer 152da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ in the documentation and/or other materials provided with the 162da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ distribution. 172da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ * Neither the names of the Xiph.org Foundation nor Pinknoise 182da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ Productions Ltd nor the names of its contributors may be used to 192da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ endorse or promote products derived from this software without 202da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ specific prior written permission. 212da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ 222da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 232da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 242da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 252da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 262da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 272da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 282da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 292da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 302da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 312da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 322da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 332da723a953a18e3c7fec194cec1216cf31130c86Gloria Wang@ ---------------------------------------------------------------------- 347913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang 357913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang .text 367913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang 377913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang .global render_lineARM 387913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang 397913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wangrender_lineARM: 407913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang @ r0 = n 417913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang @ r1 = d 427913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang @ r2 = floor 437913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang @ r3 = base 447913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang @ <> = err 457913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang @ <> = adx 467913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang @ <> = ady 477913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang MOV r12,r13 487913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang STMFD r13!,{r4-r6,r11,r14} 497913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang LDMFD r12,{r11,r12,r14} @ r11 = err 507913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang @ r12 = adx 517913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang @ r14 = ady 527913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wangrl_loop: 537913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang LDR r4, [r1] @ r4 = *d 547913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang LDR r5, [r2], r3,LSL #2 @ r5 = *floor r2 = floor+base 557913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang SUBS r11,r11,r14 @ err -= ady 567913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang MOV r4, r4, ASR #6 577913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang MUL r5, r4, r5 @ r5 = MULT31_SHIFT15 587913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang ADDLT r11,r11,r12 @ if (err < 0) err+=adx 597913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang ADDLT r2, r2, #4 @ floor+=1 607913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang SUBS r0, r0, #1 617913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang STR r5, [r1], #4 627913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang BGT rl_loop 637913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang 647913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang LDMFD r13!,{r4-r6,r11,PC} 657913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang 667913073ddf11ca3dd7b0439998e1b17d443bb0baGloria Wang @ END 67