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5 changed files with 182 additions and 357 deletions
10
Makefile
10
Makefile
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@ -2,11 +2,8 @@
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all : mandel.xex
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mandel.xex : mandel.o mandel-core.o tables.o atari-xex.cfg
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ld65 -C ./atari-xex.cfg --mapfile mandel.map -o $@ mandel.o mandel-core.o tables.o atari.lib
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mandel.s : mandel.c mandel.h
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cc65 -o $@ mandel.c
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mandel.xex : mandel.o tables.o atari-asm-xex.cfg
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ld65 -C ./atari-asm-xex.cfg -o $@ mandel.o tables.o
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%.o : %.s
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ca65 -o $@ $<
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@ -16,7 +13,6 @@ tables.s : tables.js
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clean :
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rm -f tables.s
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rm -f mandel.s
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rm -f *.o
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rm -f *.xex
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rm -f mandel.map
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@ -1,69 +0,0 @@
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# Sample linker configuration for C programs using the Atari binary file support.
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# Use with: cl65 -tatari -Catari-xex.cfg prog.c -o prog.xex
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FEATURES {
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STARTADDRESS: default = $8000;
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}
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SYMBOLS {
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__SYSTEM_CHECK__: type = import; # force inclusion of "system check" load chunk
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__STACKSIZE__: type = weak, value = $0800; # 2k stack
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__STARTADDRESS__: type = export, value = %S;
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__RESERVED_MEMORY__: type = weak, value = $0000;
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__SYSCHKHDR__: type = export, value = 0; # Disable system check header
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__SYSCHKTRL__: type = export, value = 0; # Disable system check trailer
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__TABLESEG_START__: type = weak, value = $2E00 + $0300;
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__TABLESEG_SIZE__: type = weak, value = 6 * $100;
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__BANKSY_START__: type = weak, value = $4000;
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__BANKSY_SIZE__: type = weak, value = $4000;
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__FRAMEBUFFER_START__: type = weak, value = $A000;
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}
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MEMORY {
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# Note -- $80 and $81 (LOMEM) appear to be reserved in ZP.
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ZP: file = "", define = yes, start = $0082, size = $007E;
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# "system check" load chunk
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SYSCHKCHNK: file = %O, start = $2E00, size = $0300;
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# Note $a000-$bfff is against the BASIC cartridge, may require booting with OPTION.
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TABLES: file = %O, define = yes, start = __TABLESEG_START__, size = __TABLESEG_SIZE__;
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# We reserve $4000-7fff for the bank-switch window.
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# In theory we could keep data and code here that we only use on 48k/64k systems.
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BANKSWITCH: file = "", define = yes, start = __BANKSY_START__, size = __BANKSY_SIZE__;
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# "main program" load chunk
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MAIN: file = %O, define = yes, start = %S, size = __FRAMEBUFFER_START__ - __STACKSIZE__ - __RESERVED_MEMORY__ - %S;
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}
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FILES {
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%O: format = atari;
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}
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FORMATS {
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atari: runad = start,
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initad = SYSCHKCHNK: __SYSTEM_CHECK__;
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}
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SEGMENTS {
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ZEROPAGE: load = ZP, type = zp;
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EXTZP: load = ZP, type = zp, optional = yes;
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SYSCHK: load = SYSCHKCHNK, type = rw, define = yes, optional = yes;
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TABLES: load = TABLES, type = ro, optional = yes, align = 256;
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BANKSWICH: load = BANKSWITCH, type = ro, optional = yes;
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STARTUP: load = MAIN, type = ro, define = yes;
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LOWBSS: load = MAIN, type = rw, optional = yes; # not zero initialized
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LOWCODE: load = MAIN, type = ro, define = yes, optional = yes;
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ONCE: load = MAIN, type = ro, optional = yes;
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CODE: load = MAIN, type = ro, define = yes;
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RODATA: load = MAIN, type = ro;
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DATA: load = MAIN, type = rw;
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INIT: load = MAIN, type = rw, optional = yes;
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BSS: load = MAIN, type = bss, define = yes;
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}
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FEATURES {
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CONDES: type = constructor,
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label = __CONSTRUCTOR_TABLE__,
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count = __CONSTRUCTOR_COUNT__,
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segment = ONCE;
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CONDES: type = destructor,
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label = __DESTRUCTOR_TABLE__,
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count = __DESTRUCTOR_COUNT__,
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segment = RODATA;
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CONDES: type = interruptor,
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label = __INTERRUPTOR_TABLE__,
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count = __INTERRUPTOR_COUNT__,
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segment = RODATA,
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import = __CALLIRQ__;
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}
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15
mandel.c
15
mandel.c
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@ -1,15 +0,0 @@
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/**
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* The UI and I/O wrapper for the Mandelbrot runner, in C.
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*
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* For the moment *all* logic is in mandel-core.s, I'm just
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* trying to get this to run within a cc65 environment.
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* Eventually just the inner loop fun will live in there.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include "mandel.h"
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void main(void) {
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mandel_start();
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}
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4
mandel.h
4
mandel.h
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@ -1,4 +0,0 @@
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#include <inttypes.h>
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// From mandel-core.s:
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extern void mandel_start(void);
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@ -1,44 +1,44 @@
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.zeropage
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; Our zero-page vars
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ox = $80 ; fixed6.26: center point x
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oy = $84 ; fixed6.26: center point y
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cx = $88 ; fixed6.26: c_x
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cy = $8c ; fixed6.26: c_y
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ox: .res 4 ; fixed6.26: center point x
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oy: .res 4 ; fixed6.26: center point y
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cx: .res 4 ; fixed6.26: c_x
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cy: .res 4 ; fixed6.26: c_y
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zx = $90 ; fixed6.26: z_x
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zy = $94 ; fixed6.26: z_y
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zx_2 = $98 ; fixed6.26: z_x^2
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zy_2 = $9c ; fixed6.26: z_y^2
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zx: .res 4 ; fixed6.26: z_x
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zy: .res 4 ; fixed6.26: z_y
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zx_2: .res 4 ; fixed6.26: z_x^2
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zy_2: .res 4 ; fixed6.26: z_y^2
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zx_zy = $a0 ; fixed6.26: z_x * z_y
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dist = $a4 ; fixed6.26: z_x^2 + z_y^2
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sx = $a8 ; i16: screen pixel x
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sy = $aa ; i16: screen pixel y
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z_buffer_active = $ac ; boolean: 1 if we triggered the lake, 0 if not
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z_buffer_start = $ad ; u8: index into z_buffer
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z_buffer_end = $ae ; u8: index into z_buffer
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iter = $af ; u8: iteration count
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zx_zy: .res 4 ; fixed6.26: z_x * z_y
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dist: .res 4 ; fixed6.26: z_x^2 + z_y^2
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ptr = $b0 ; u16
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pixel_ptr = $b2 ; u16
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zoom = $b4 ; u8: zoom shift level
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fill_level = $b5 ; u8
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pixel_color = $b6 ; u8
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pixel_mask = $b7 ; u8
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pixel_shift = $b8 ; u8
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pixel_offset = $b9 ; u8
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palette_offset = $ba ; u8
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chroma_offset = $bb ; u8
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palette_ticks = $bc ; u8
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chroma_ticks = $bd ; u8
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count_frames = $be ; u8
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; free space $bf
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z_buffer_active: .res 1 ; boolean: 1 if we triggered the lake, 0 if not
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z_buffer_start: .res 1 ; u8: index into z_buffer
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z_buffer_end: .res 1 ; u8: index into z_buffer
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iter: .res 1 ; u8: iteration count
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ptr: .res 2 ; u16
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temp: .res 2 ; u16
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temp2: .res 2 ; u16
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.data
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; can move to .data
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sx: .res 2 ; i16: screen pixel x
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sy: .res 2 ; i16: screen pixel y
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zoom: .res 1 ; u8: zoom shift level
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fill_level: .res 1 ; u8
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pixel_color: .res 1 ; u8
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pixel_mask: .res 1 ; u8
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pixel_shift: .res 1 ; u8
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pixel_offset: .res 1 ; u8
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palette_offset: .res 1 ; u8
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chroma_offset: .res 1 ; u8
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palette_ticks: .res 1 ; u8
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chroma_ticks: .res 1 ; u8
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count_frames: .res 1 ; u8
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count_iters: .res 2 ; u16
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text_col: .res 1 ; u8
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text_row: .res 1 ; u8
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count_iters = $c0 ; u16
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text_col = $c2 ; u8
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text_row = $c3 ; u8
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; free space c4-cb
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temp = $cc ; u16
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temp2 = $ce ; u16
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palette_delay = 23
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chroma_delay = 137
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@ -126,12 +126,6 @@ KEY_7 = 51
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KEY_8 = 53
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KEY_9 = 48
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KEY_0 = 50
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KEY_PERIOD = 34
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KEY_E = 42
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KEY_X = 22
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KEY_Y = 43
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.data
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.struct float48
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exponent .byte
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@ -144,6 +138,7 @@ KEY_Y = 43
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.import sqr_lobyte
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.import sqr_hibyte
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.data
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strings:
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str_self:
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@ -362,7 +357,7 @@ z_buffer:
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.word 0
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.endrepeat
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.export _mandel_start
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.export start
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;max_fill_level = 6
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max_fill_level = 3
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@ -408,13 +403,6 @@ elapsed_work:
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elapsed_digit:
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.byte 0
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input_col:
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.byte 0
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input_row:
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.byte 0
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input_max:
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.byte 0
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; 2 + 9 * byte cycles
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.macro add bytes, dest, arg1, arg2
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clc ; 2 cyc
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@ -462,7 +450,7 @@ input_max:
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sub 4, dest, arg1, arg2
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.endmacro
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; 3 + 5 * (bytes - 1) cycles
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; 3 + 5 * bytes cycles
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.macro shl bytes, arg
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asl arg ; 3 cyc
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.repeat bytes-1, i
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@ -470,23 +458,22 @@ input_max:
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.endrepeat
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.endmacro
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; 8 cycles
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; 13 cycles
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.macro shl16 arg
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shl 2, arg
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.endmacro
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; 13 cycles
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; 18 cycles
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.macro shl24 arg
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shl 3, arg
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.endmacro
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; 18 cycles
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; 23 cycles
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.macro shl32 arg
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shl 4, arg
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.endmacro
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; 6 * bytes cycles
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; 4 * bytes bytes
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.macro copy bytes, dest, arg
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.repeat bytes, byte ; 6 * bytes cycles
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lda arg + byte ; 3 cyc
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@ -495,7 +482,6 @@ input_max:
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.endmacro
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; 12 cycles
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; 8 bytes
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.macro copy16 dest, arg
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copy 2, dest, arg
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.endmacro
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@ -530,19 +516,17 @@ input_max:
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neg 4, arg
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.endmacro
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; 11-27 + 18 * shift cycles
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; 65-81 cycles for shift=3
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; 11-27 + 23 * shift cycles
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; 103-119 cycles for shift=4
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.macro shift_round_16 arg, shift
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.repeat shift
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shl32 arg ; 18 cycles
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shl32 arg ; 23 cycles
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.endrepeat
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round16 arg ; 11-27 cycles
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.endmacro
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; input: arg1, arg2 as fixed4.12
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; output: dest as fixed8.24
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; patch point jsr at 16 bytes in
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imul16_patch_offset = 16
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.macro imul16 dest, arg1, arg2
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copy16 FR0, arg1 ; 12 cyc
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copy16 FR1, arg2 ; 12 cyc
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@ -552,8 +536,6 @@ imul16_patch_offset = 16
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; input: arg as fixed4.12
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; output: dest as fixed8.24
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; patch point jsr at 8 bytes in
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sqr16_patch_offset = 8
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.macro sqr16 dest, arg
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copy16 FR0, arg ; 12 cyc
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jsr sqr16_func ; ? cyc
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@ -699,6 +681,71 @@ bank_switch_table:
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.endif
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.endmacro
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.proc imul8xe_init
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bank_switch 0
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lda #0
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sta EXTENDED_RAM
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bank_switch 1
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lda #1
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sta EXTENDED_RAM
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bank_switch 0
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lda EXTENDED_RAM
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beq init
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; no bank switching available, we just overwrite the value in base ram
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rts
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init:
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|
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; patch imul16_func into a forwarding thunk to imul16xe_func
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lda #$4c ; 'jmp' opcode
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sta imul16_func
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lda #.lobyte(imul16xe_func)
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sta imul16_func + 1
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lda #.hibyte(imul16xe_func)
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sta imul16_func + 2
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; ditto for sqr16_func -> sqr16xe_func
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lda #$4c ; 'jmp' opcode
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sta sqr16_func
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lda #.lobyte(sqr16xe_func)
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sta sqr16_func + 1
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lda #.hibyte(sqr16xe_func)
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sta sqr16_func + 2
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|
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; create the lookup table
|
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; go through the input set, in four 16KB chunks
|
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|
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arg1 = FR1
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arg2 = FR2
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result = FR0
|
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|
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lda #$00
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sta arg1
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sta arg2
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sta ptr
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lda #$40
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sta ptr + 1
|
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|
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; $00 * $00 -> $3f * $ff
|
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bank_switch 0
|
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jsr imul8xe_init_section
|
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|
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; $40 * $00 -> $7f * $ff
|
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bank_switch 1
|
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jsr imul8xe_init_section
|
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|
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; $80 * $00 -> $bf * $ff
|
||||
bank_switch 2
|
||||
jsr imul8xe_init_section
|
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|
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; $c0 * $00 -> $ff * $ff
|
||||
bank_switch 3
|
||||
jsr imul8xe_init_section
|
||||
|
||||
rts
|
||||
.endproc
|
||||
|
||||
; Initialize a 16 KB chunk of the table
|
||||
; input: multipliers in temp
|
||||
|
|
@ -936,17 +983,6 @@ common:
|
|||
|
||||
.endproc
|
||||
|
||||
; rounds to 16-bit first!
|
||||
; input in FR0, 32 bits signed 6.26 fixed
|
||||
; output in FR0, Atari float
|
||||
; clobbers a, x, y, FR0, FR1
|
||||
.proc fixed6_26_to_float
|
||||
shift_round_16 FR0, 3
|
||||
copy16 FR0, FR0 + 2
|
||||
jsr fixed3_13_to_float
|
||||
rts
|
||||
.endproc
|
||||
|
||||
; input in FR0, Atari float
|
||||
; output in FR0, 16 bits signed 3.13 fixed
|
||||
; clobbers a, x, y, FR0, FR1
|
||||
|
|
@ -1098,15 +1134,12 @@ keep_going:
|
|||
shift_round_16 zy, 3
|
||||
|
||||
; zx_2 = zx * zx
|
||||
fixup_sqr16_1:
|
||||
sqr16 zx_2, zx + 2
|
||||
|
||||
; zy_2 = zy * zy
|
||||
fixup_sqr16_2:
|
||||
sqr16 zy_2, zy + 2
|
||||
|
||||
; zx_zy = zx * zy
|
||||
fixup_imul16_1:
|
||||
imul16 zx_zy, zx + 2, zy + 2
|
||||
|
||||
; dist = zx_2 + zy_2
|
||||
|
|
@ -1254,21 +1287,21 @@ enough:
|
|||
negative:
|
||||
; temp1 = top half
|
||||
lda #.lobyte(framebuffer_top + stride * half_height)
|
||||
sta ptr
|
||||
sta pixel_ptr
|
||||
lda #.hibyte(framebuffer_top + stride * half_height)
|
||||
sta ptr + 1
|
||||
sta pixel_ptr + 1
|
||||
jmp point
|
||||
|
||||
positive:
|
||||
|
||||
lda #.lobyte(framebuffer_bottom)
|
||||
sta ptr
|
||||
sta pixel_ptr
|
||||
lda #.hibyte(framebuffer_bottom)
|
||||
sta ptr + 1
|
||||
sta pixel_ptr + 1
|
||||
|
||||
point:
|
||||
|
||||
; ptr += sy * stride
|
||||
; pixel_ptr += sy * stride
|
||||
; temp * 40
|
||||
; = temp * 32 + temp * 8
|
||||
; = (temp << 5) + (temp << 3)
|
||||
|
|
@ -1276,10 +1309,10 @@ point:
|
|||
shl16 temp
|
||||
shl16 temp
|
||||
shl16 temp
|
||||
add16 ptr, ptr, temp
|
||||
add16 pixel_ptr, pixel_ptr, temp
|
||||
shl16 temp
|
||||
shl16 temp
|
||||
add16 ptr, ptr, temp
|
||||
add16 pixel_ptr, pixel_ptr, temp
|
||||
|
||||
; Ok so temp1 points to the start of the line, which is 40 bytes.
|
||||
; Get the byte and bit offsets
|
||||
|
|
@ -1319,20 +1352,20 @@ shift_done:
|
|||
|
||||
draw_pixel:
|
||||
; read, mask, or, write
|
||||
lda (ptr),y
|
||||
lda (pixel_ptr),y
|
||||
and pixel_mask
|
||||
ora pixel_color
|
||||
sta (ptr),y
|
||||
sta (pixel_ptr),y
|
||||
|
||||
dex
|
||||
beq done
|
||||
clc
|
||||
lda #40
|
||||
adc ptr
|
||||
sta ptr
|
||||
adc pixel_ptr
|
||||
sta pixel_ptr
|
||||
lda #0
|
||||
adc ptr + 1
|
||||
sta ptr + 1
|
||||
adc pixel_ptr + 1
|
||||
sta pixel_ptr + 1
|
||||
jmp draw_pixel
|
||||
|
||||
done:
|
||||
|
|
@ -1570,7 +1603,7 @@ number_keys:
|
|||
beq five
|
||||
cpy #KEY_6
|
||||
beq six
|
||||
jmp letter_keys
|
||||
jmp skip_char
|
||||
|
||||
one:
|
||||
ldx #0
|
||||
|
|
@ -1589,21 +1622,7 @@ five:
|
|||
jmp load_key_viewport
|
||||
six:
|
||||
ldx #5
|
||||
jmp load_key_viewport
|
||||
|
||||
letter_keys:
|
||||
cpy #KEY_X
|
||||
bne not_x
|
||||
jsr input_x
|
||||
jmp done
|
||||
not_x:
|
||||
cpy #KEY_Y
|
||||
bne not_y
|
||||
jsr input_y
|
||||
jmp done
|
||||
not_y:
|
||||
jmp skip_char
|
||||
|
||||
; fall through
|
||||
load_key_viewport:
|
||||
jsr load_viewport
|
||||
; fall through
|
||||
|
|
@ -1613,23 +1632,6 @@ done:
|
|||
|
||||
.endproc
|
||||
|
||||
.proc input_x
|
||||
ldx #col_x
|
||||
ldy #1
|
||||
jsr input_number
|
||||
|
||||
|
||||
rts
|
||||
.endproc
|
||||
|
||||
.proc input_y
|
||||
rts
|
||||
.endproc
|
||||
|
||||
.proc input_number
|
||||
rts
|
||||
.endproc
|
||||
|
||||
.proc clear_screen
|
||||
; zero the range from framebuffer_top to display_list
|
||||
lda #.lobyte(framebuffer_top)
|
||||
|
|
@ -1677,7 +1679,9 @@ zero_byte_loop:
|
|||
draw_string_const str_x
|
||||
|
||||
copy32 FR0, ox
|
||||
jsr fixed6_26_to_float
|
||||
shift_round_16 FR0, 3
|
||||
copy16 FR0, FR0 + 2
|
||||
jsr fixed3_13_to_float
|
||||
jsr FASC
|
||||
jsr draw_string
|
||||
|
||||
|
|
@ -1686,7 +1690,9 @@ zero_byte_loop:
|
|||
draw_string_const str_y
|
||||
|
||||
copy32 FR0, oy
|
||||
jsr fixed6_26_to_float
|
||||
shift_round_16 FR0, 3
|
||||
copy16 FR0, FR0 + 2
|
||||
jsr fixed3_13_to_float
|
||||
jsr FASC
|
||||
jsr draw_string
|
||||
|
||||
|
|
@ -1746,7 +1752,7 @@ zero_byte_loop:
|
|||
rts
|
||||
.endproc
|
||||
|
||||
.proc _mandel_start
|
||||
.proc start
|
||||
|
||||
jsr imul8xe_init
|
||||
|
||||
|
|
@ -1985,25 +1991,51 @@ update_status:
|
|||
lda FR0 + 1
|
||||
sta elapsed_work + 1
|
||||
|
||||
draw_string_const str_space
|
||||
|
||||
.macro do_countdown divisor, digits
|
||||
ldx #.lobyte(divisor)
|
||||
ldy #.hibyte(divisor)
|
||||
lda #.lobyte(digits)
|
||||
sta INBUFF
|
||||
lda #.hibyte(digits)
|
||||
sta INBUFF + 1
|
||||
jsr countdown
|
||||
;jsr IFP
|
||||
;jsr FASC
|
||||
;jsr draw_string
|
||||
|
||||
.macro countdown divisor, digits
|
||||
.scope
|
||||
; count the hours
|
||||
ldx #0
|
||||
countdown_loop:
|
||||
lda elapsed_work + 1
|
||||
cmp #.hibyte(divisor)
|
||||
bcc countdown_done
|
||||
lda elapsed_work
|
||||
cmp #.lobyte(divisor)
|
||||
bcc countdown_done
|
||||
sec
|
||||
lda elapsed_work
|
||||
sbc #.lobyte(divisor)
|
||||
sta elapsed_work
|
||||
lda elapsed_work + 1
|
||||
sbc #.hibyte(divisor)
|
||||
sta elapsed_work + 1
|
||||
inx
|
||||
jmp countdown_loop
|
||||
countdown_done:
|
||||
lda digits,x
|
||||
eor #$80
|
||||
sta elapsed_digit
|
||||
lda #.lobyte(elapsed_digit)
|
||||
sta INBUFF
|
||||
lda #.hibyte(elapsed_digit)
|
||||
sta INBUFF + 1
|
||||
jsr draw_string
|
||||
.endscope
|
||||
.endmacro
|
||||
do_countdown 36000, digits_space
|
||||
do_countdown 3600, digits_zero
|
||||
|
||||
draw_string_const str_space
|
||||
countdown 36000, digits_space
|
||||
countdown 3600, digits_zero
|
||||
draw_string_const str_h
|
||||
do_countdown 600, digits_zero
|
||||
do_countdown 60, digits_zero
|
||||
countdown 600, digits_zero
|
||||
countdown 60, digits_zero
|
||||
draw_string_const str_m
|
||||
do_countdown 10, digits_zero
|
||||
do_countdown 1, digits_zero
|
||||
countdown 10, digits_zero
|
||||
countdown 1, digits_zero
|
||||
draw_string_const str_s
|
||||
|
||||
skipped:
|
||||
|
|
@ -2065,118 +2097,3 @@ loop:
|
|||
jmp main_loop
|
||||
|
||||
.endproc
|
||||
|
||||
; digit string in INBUFF
|
||||
; divisor X/Y
|
||||
; clobbers temp, calls draw_string
|
||||
.proc countdown
|
||||
divisor = temp
|
||||
stx divisor
|
||||
sty divisor + 1
|
||||
|
||||
; count the hours
|
||||
ldy #0
|
||||
countdown_loop:
|
||||
lda elapsed_work + 1
|
||||
cmp divisor + 1
|
||||
beq countdown_lobyte
|
||||
bcc countdown_done
|
||||
bcs countdown_inc
|
||||
countdown_lobyte:
|
||||
lda elapsed_work
|
||||
cmp divisor
|
||||
bcc countdown_done
|
||||
countdown_inc:
|
||||
sec
|
||||
lda elapsed_work
|
||||
sbc divisor
|
||||
sta elapsed_work
|
||||
lda elapsed_work + 1
|
||||
sbc divisor + 1
|
||||
sta elapsed_work + 1
|
||||
iny
|
||||
jmp countdown_loop
|
||||
countdown_done:
|
||||
lda (INBUFF),y
|
||||
eor #$80
|
||||
sta elapsed_digit
|
||||
lda #.lobyte(elapsed_digit)
|
||||
sta INBUFF
|
||||
lda #.hibyte(elapsed_digit)
|
||||
sta INBUFF + 1
|
||||
jsr draw_string
|
||||
rts
|
||||
.endproc
|
||||
|
||||
.proc imul8xe_init
|
||||
|
||||
bank_switch 0
|
||||
lda #0
|
||||
sta EXTENDED_RAM
|
||||
bank_switch 1
|
||||
lda #1
|
||||
sta EXTENDED_RAM
|
||||
bank_switch 0
|
||||
lda EXTENDED_RAM
|
||||
beq init
|
||||
|
||||
; no bank switching available, we just overwrite the value in base ram
|
||||
rts
|
||||
|
||||
init:
|
||||
|
||||
; patch imul16_func into a forwarding thunk to imul16xe_func
|
||||
lda #$4c ; 'jmp' opcode
|
||||
sta imul16_func
|
||||
lda #.lobyte(imul16xe_func)
|
||||
sta imul16_func + 1
|
||||
sta mandelbrot::fixup_imul16_1 + imul16_patch_offset + 1
|
||||
lda #.hibyte(imul16xe_func)
|
||||
sta imul16_func + 2
|
||||
sta mandelbrot::fixup_imul16_1 + imul16_patch_offset + 2
|
||||
|
||||
; ditto for sqr16_func -> sqr16xe_func
|
||||
lda #$4c ; 'jmp' opcode
|
||||
sta sqr16_func
|
||||
lda #.lobyte(sqr16xe_func)
|
||||
sta sqr16_func + 1
|
||||
sta mandelbrot::fixup_sqr16_1 + sqr16_patch_offset + 1
|
||||
sta mandelbrot::fixup_sqr16_2 + sqr16_patch_offset + 1
|
||||
lda #.hibyte(sqr16xe_func)
|
||||
sta sqr16_func + 2
|
||||
sta mandelbrot::fixup_sqr16_1 + sqr16_patch_offset + 2
|
||||
sta mandelbrot::fixup_sqr16_2 + sqr16_patch_offset + 2
|
||||
|
||||
|
||||
; create the lookup table
|
||||
; go through the input set, in four 16KB chunks
|
||||
|
||||
arg1 = FR1
|
||||
arg2 = FR2
|
||||
result = FR0
|
||||
|
||||
lda #$00
|
||||
sta arg1
|
||||
sta arg2
|
||||
sta ptr
|
||||
lda #$40
|
||||
sta ptr + 1
|
||||
|
||||
; $00 * $00 -> $3f * $ff
|
||||
bank_switch 0
|
||||
jsr imul8xe_init_section
|
||||
|
||||
; $40 * $00 -> $7f * $ff
|
||||
bank_switch 1
|
||||
jsr imul8xe_init_section
|
||||
|
||||
; $80 * $00 -> $bf * $ff
|
||||
bank_switch 2
|
||||
jsr imul8xe_init_section
|
||||
|
||||
; $c0 * $00 -> $ff * $ff
|
||||
bank_switch 3
|
||||
jsr imul8xe_init_section
|
||||
|
||||
rts
|
||||
.endproc
|
||||
Loading…
Add table
Add a link
Reference in a new issue