sdl-ios-xcode: src/audio/dc/aica.c annotate

annotate src/audio/dc/aica.c @ 1035:974ba6ae0fa3

Date: Wed, 26 Jan 2005 13:37:09 GMT From: Peter Naulls Subject: RISC OS SDL Patches Sam, I've attached a diff of the latest changes to libSDL for RISC OS support. These changes are by Alan Buckley and myself. The most significant of these are: Optimised assembler blit rountines - I've attached the file src/video/riscos/SDL_riscosASM.s which is needed for this. Move to using /dev/dsp instead of its own audio implementation. This means that src/audio/riscos/SDL_drenderer.c should be removed Typo fixes. Mainly correct spelling of "RISC OS", but some from elsewhere too.

author	Sam Lantinga <slouken@libsdl.org>
date	Sat, 12 Feb 2005 18:01:31 +0000
parents	dad72daf44b3
children	11134dc42da8

rev	line source
509 dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	1 /* This file is part of the Dreamcast function library.
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	2 * Please see libdream.c for further details.
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	3 *
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	4 * (c)2000 Dan Potter
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	5 * modify BERO
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	6 */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	7 #include "aica.h"
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	8
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	9 /* #define dc_snd_base ((volatile unsigned char )0x00800000) / /* arm side */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	10 #define dc_snd_base ((volatile unsigned char )0xa0700000) / dc side */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	11
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	12 /* Some convienence macros */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	13 #define SNDREGADDR(x) (0xa0700000 + (x))
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	14 #define CHNREGADDR(ch,x) SNDREGADDR(0x80*(ch)+(x))
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	15
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	16
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	17 #define SNDREG32(x) ((volatile unsigned long )SNDREGADDR(x))
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	18 #define SNDREG8(x) ((volatile unsigned char )SNDREGADDR(x))
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	19 #define CHNREG32(ch, x) ((volatile unsigned long )CHNREGADDR(ch,x))
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	20 #define CHNREG8(ch, x) ((volatile unsigned long )CHNREGADDR(ch,x))
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	21
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	22 #define G2_LOCK(OLD) \
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	23 do { \
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	24 if (!irq_inside_int()) \
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	25 OLD = irq_disable(); \
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	26 /* suspend any G2 DMA here... */ \
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	27 while(((volatile unsigned int )0xa05f688c) & 0x20) \
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	28 ; \
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	29 } while(0)
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	30
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	31 #define G2_UNLOCK(OLD) \
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	32 do { \
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	33 /* resume any G2 DMA here... */ \
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	34 if (!irq_inside_int()) \
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	35 irq_restore(OLD); \
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	36 } while(0)
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	37
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	38
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	39 void aica_init() {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	40 int i, j, old;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	41
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	42 /* Initialize AICA channels */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	43 G2_LOCK(old);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	44 SNDREG32(0x2800) = 0x0000;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	45
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	46 for (i=0; i<64; i++) {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	47 for (j=0; j<0x80; j+=4) {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	48 if ((j&31)==0) g2_fifo_wait();
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	49 CHNREG32(i, j) = 0;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	50 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	51 g2_fifo_wait();
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	52 CHNREG32(i,0) = 0x8000;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	53 CHNREG32(i,20) = 0x1f;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	54 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	55
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	56 SNDREG32(0x2800) = 0x000f;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	57 g2_fifo_wait();
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	58 G2_UNLOCK(old);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	59 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	60
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	61 /* Translates a volume from linear form to logarithmic form (required by
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	62 the AICA chip */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	63 /* int logs[] = {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	64
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	65 0, 40, 50, 58, 63, 68, 73, 77, 80, 83, 86, 89, 92, 94, 97, 99, 101, 103,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	66 105, 107, 109, 111, 112, 114, 116, 117, 119, 120, 122, 123, 125, 126, 127,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	67 129, 130, 131, 133, 134, 135, 136, 137, 139, 140, 141, 142, 143, 144, 145,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	68 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 156, 157, 158, 159,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	69 160, 161, 162, 162, 163, 164, 165, 166, 166, 167, 168, 169, 170, 170, 171,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	70 172, 172, 173, 174, 175, 175, 176, 177, 177, 178, 179, 180, 180, 181, 182,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	71 182, 183, 183, 184, 185, 185, 186, 187, 187, 188, 188, 189, 190, 190, 191,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	72 191, 192, 193, 193, 194, 194, 195, 196, 196, 197, 197, 198, 198, 199, 199,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	73 200, 201, 201, 202, 202, 203, 203, 204, 204, 205, 205, 206, 206, 207, 207,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	74 208, 208, 209, 209, 210, 210, 211, 211, 212, 212, 213, 213, 214, 214, 215,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	75 215, 216, 216, 217, 217, 217, 218, 218, 219, 219, 220, 220, 221, 221, 222,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	76 222, 222, 223, 223, 224, 224, 225, 225, 225, 226, 226, 227, 227, 228, 228,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	77 228, 229, 229, 230, 230, 230, 231, 231, 232, 232, 232, 233, 233, 234, 234,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	78 234, 235, 235, 236, 236, 236, 237, 237, 238, 238, 238, 239, 239, 240, 240,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	79 240, 241, 241, 241, 242, 242, 243, 243, 243, 244, 244, 244, 245, 245, 245,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	80 246, 246, 247, 247, 247, 248, 248, 248, 249, 249, 249, 250, 250, 250, 251,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	81 251, 251, 252, 252, 252, 253, 253, 253, 254, 254, 254, 255
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	82
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	83 }; */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	84
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	85 const static unsigned char logs[] = {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	86 0, 15, 22, 27, 31, 35, 39, 42, 45, 47, 50, 52, 55, 57, 59, 61,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	87 63, 65, 67, 69, 71, 73, 74, 76, 78, 79, 81, 82, 84, 85, 87, 88,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	88 90, 91, 92, 94, 95, 96, 98, 99, 100, 102, 103, 104, 105, 106,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	89 108, 109, 110, 111, 112, 113, 114, 116, 117, 118, 119, 120, 121,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	90 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	91 135, 136, 137, 138, 138, 139, 140, 141, 142, 143, 144, 145, 146,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	92 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 156,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	93 157, 158, 159, 160, 160, 161, 162, 163, 164, 164, 165, 166, 167,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	94 167, 168, 169, 170, 170, 171, 172, 173, 173, 174, 175, 176, 176,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	95 177, 178, 178, 179, 180, 181, 181, 182, 183, 183, 184, 185, 185,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	96 186, 187, 187, 188, 189, 189, 190, 191, 191, 192, 193, 193, 194,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	97 195, 195, 196, 197, 197, 198, 199, 199, 200, 200, 201, 202, 202,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	98 203, 204, 204, 205, 205, 206, 207, 207, 208, 209, 209, 210, 210,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	99 211, 212, 212, 213, 213, 214, 215, 215, 216, 216, 217, 217, 218,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	100 219, 219, 220, 220, 221, 221, 222, 223, 223, 224, 224, 225, 225,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	101 226, 227, 227, 228, 228, 229, 229, 230, 230, 231, 232, 232, 233,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	102 233, 234, 234, 235, 235, 236, 236, 237, 237, 238, 239, 239, 240,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	103 240, 241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 246, 246,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	104 247, 247, 248, 248, 249, 249, 250, 250, 251, 251, 252, 252, 253, 254, 255
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	105 };
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	106
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	107 /* For the moment this is going to have to suffice, until we really
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	108 figure out what these mean. */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	109 #define AICA_PAN(x) ((x)==0x80?(0):((x)<0x80?(0x1f):(0x0f)))
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	110 #define AICA_VOL(x) (0xff - logs[128 + (((x) & 0xff) / 2)])
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	111 //#define AICA_VOL(x) (0xff - logs[x&255])
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	112
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	113 static inline unsigned AICA_FREQ(unsigned freq) {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	114 unsigned long freq_lo, freq_base = 5644800;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	115 int freq_hi = 7;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	116
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	117 /* Need to convert frequency to floating point format
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	118 (freq_hi is exponent, freq_lo is mantissa)
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	119 Formula is ferq = 441002^freq_hi(1+freq_lo/1024) */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	120 while (freq < freq_base && freq_hi > -8) {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	121 freq_base >>= 1;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	122 --freq_hi;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	123 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	124 while (freq < freq_base && freq_hi > -8) {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	125 freq_base >>= 1;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	126 freq_hi--;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	127 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	128 freq_lo = (freq<<10) / freq_base;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	129 return (freq_hi << 11) \| (freq_lo & 1023);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	130 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	131
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	132 /* Sets up a sound channel completely. This is generally good if you want
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	133 a quick and dirty way to play notes. If you want a more comprehensive
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	134 set of routines (more like PC wavetable cards) see below.
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	135
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	136 ch is the channel to play on (0 - 63)
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	137 smpptr is the pointer to the sound data; if you're running off the
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	138 SH4, then this ought to be (ptr - 0xa0800000); otherwise it's just
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	139 ptr. Basically, it's an offset into sound ram.
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	140 mode is one of the mode constants (16 bit, 8 bit, ADPCM)
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	141 nsamp is the number of samples to play (not number of bytes!)
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	142 freq is the sampling rate of the sound
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	143 vol is the volume, 0 to 0xff (0xff is louder)
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	144 pan is a panning constant -- 0 is left, 128 is center, 255 is right.
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	145
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	146 This routine (and the similar ones) owe a lot to Marcus' sound example --
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	147 I hadn't gotten quite this far into dissecting the individual regs yet. */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	148 void aica_play(int ch,int mode,unsigned long smpptr,int loopst,int loopend,int freq,int vol,int pan,int loopflag) {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	149 int i;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	150 int val;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	151 int old;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	152
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	153 /* Stop the channel (if it's already playing) */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	154 aica_stop(ch);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	155 /* doesn't seem to be needed, but it's here just in case */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	156 /*
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	157 for (i=0; i<256; i++) {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	158 asm("nop");
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	159 asm("nop");
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	160 asm("nop");
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	161 asm("nop");
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	162 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	163 */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	164 G2_LOCK(old);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	165 /* Envelope setup. The first of these is the loop point,
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	166 e.g., where the sample starts over when it loops. The second
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	167 is the loop end. This is the full length of the sample when
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	168 you are not looping, or the loop end point when you are (though
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	169 storing more than that is a waste of memory if you're not doing
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	170 volume enveloping). */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	171 CHNREG32(ch, 8) = loopst & 0xffff;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	172 CHNREG32(ch, 12) = loopend & 0xffff;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	173
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	174 /* Write resulting values */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	175 CHNREG32(ch, 24) = AICA_FREQ(freq);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	176
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	177 /* Set volume, pan, and some other things that we don't know what
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	178 they do =) */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	179 CHNREG32(ch, 36) = AICA_PAN(pan) \| (0xf<<8);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	180 /* Convert the incoming volume and pan into hardware values */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	181 /* Vol starts at zero so we can ramp */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	182 vol = AICA_VOL(vol);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	183 CHNREG32(ch, 40) = 0x24 \| (vol<<8);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	184 /* Convert the incoming volume and pan into hardware values */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	185 /* Vol starts at zero so we can ramp */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	186
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	187 /* If we supported volume envelopes (which we don't yet) then
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	188 this value would set that up. The top 4 bits determine the
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	189 envelope speed. f is the fastest, 1 is the slowest, and 0
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	190 seems to be an invalid value and does weird things). The
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	191 default (below) sets it into normal mode (play and terminate/loop).
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	192 CHNREG32(ch, 16) = 0xf010;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	193 */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	194 CHNREG32(ch, 16) = 0x1f; /* No volume envelope */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	195
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	196
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	197 /* Set sample format, buffer address, and looping control. If
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	198 0x0200 mask is set on reg 0, the sample loops infinitely. If
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	199 it's not set, the sample plays once and terminates. We'll
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	200 also set the bits to start playback here. */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	201 CHNREG32(ch, 4) = smpptr & 0xffff;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	202 val = 0xc000 \| 0x0000 \| (mode<<7) \| (smpptr >> 16);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	203 if (loopflag) val\|=0x200;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	204
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	205 CHNREG32(ch, 0) = val;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	206
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	207 G2_UNLOCK(old);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	208
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	209 /* Enable playback */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	210 /* CHNREG32(ch, 0) \|= 0xc000; */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	211 g2_fifo_wait();
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	212
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	213 #if 0
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	214 for (i=0xff; i>=vol; i--) {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	215 if ((i&7)==0) g2_fifo_wait();
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	216 CHNREG32(ch, 40) = 0x24 \| (i<<8);;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	217 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	218
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	219 g2_fifo_wait();
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	220 #endif
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	221 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	222
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	223 /* Stop the sound on a given channel */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	224 void aica_stop(int ch) {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	225 g2_write_32(CHNREGADDR(ch, 0),(g2_read_32(CHNREGADDR(ch, 0)) & ~0x4000) \| 0x8000);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	226 g2_fifo_wait();
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	227 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	228
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	229
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	230 /* The rest of these routines can change the channel in mid-stride so you
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	231 can do things like vibrato and panning effects. */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	232
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	233 /* Set channel volume */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	234 void aica_vol(int ch,int vol) {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	235 // g2_write_8(CHNREGADDR(ch, 41),AICA_VOL(vol));
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	236 g2_write_32(CHNREGADDR(ch, 40),(g2_read_32(CHNREGADDR(ch, 40))&0xffff00ff)\|(AICA_VOL(vol)<<8) );
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	237 g2_fifo_wait();
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	238 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	239
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	240 /* Set channel pan */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	241 void aica_pan(int ch,int pan) {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	242 // g2_write_8(CHNREGADDR(ch, 36),AICA_PAN(pan));
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	243 g2_write_32(CHNREGADDR(ch, 36),(g2_read_32(CHNREGADDR(ch, 36))&0xffffff00)\|(AICA_PAN(pan)) );
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	244 g2_fifo_wait();
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	245 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	246
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	247 /* Set channel frequency */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	248 void aica_freq(int ch,int freq) {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	249 g2_write_32(CHNREGADDR(ch, 24),AICA_FREQ(freq));
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	250 g2_fifo_wait();
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	251 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	252
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	253 /* Get channel position */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	254 int aica_get_pos(int ch) {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	255 #if 1
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	256 /* Observe channel ch */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	257 g2_write_32(SNDREGADDR(0x280c),(g2_read_32(SNDREGADDR(0x280c))&0xffff00ff) \| (ch<<8));
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	258 g2_fifo_wait();
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	259 /* Update position counters */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	260 return g2_read_32(SNDREGADDR(0x2814)) & 0xffff;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	261 #else
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	262 /* Observe channel ch */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	263 g2_write_8(SNDREGADDR(0x280d),ch);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	264 /* Update position counters */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	265 return g2_read_32(SNDREGADDR(0x2814)) & 0xffff;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	266 #endif
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!) Sam Lantinga <slouken@libsdl.org> parents: diff changeset	267 }

Mercurial > sdl-ios-xcode

annotate src/audio/dc/aica.c @ 1035:974ba6ae0fa3