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No commits in common. "6acd22492c923e0ab3f5f30af3c1fc2fc484c196" and "fb2117dc2eed64a6e6b514c1d077a2940c4d5c5c" have entirely different histories.
6acd22492c
...
fb2117dc2e
@ -21,6 +21,7 @@ parseHex:
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add a, 10 ; C is clear, map back to 0xA-0xF
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ret
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; Parse string at (HL) as a decimal value and return value in DE.
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; Reads as many digits as it can and stop when:
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; 1 - A non-digit character is read
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@ -43,10 +44,10 @@ parseDecimal:
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; During this routine, we switch between HL and its shadow. On one side,
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; we have HL the string pointer, and on the other side, we have HL the
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; numerical result. We also use EXX to preserve BC, saving us a push.
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parseDecimalSkip: ; enter here to skip parsing the first digit
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exx ; HL as a result
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ld h, 0
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ld l, a ; load first digit in without multiplying
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ld b, 0 ; We use B to detect overflow
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.loop:
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exx ; HL as a string pointer
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@ -57,24 +58,26 @@ parseDecimalSkip: ; enter here to skip parsing the first digit
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; same as other above
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add a, 0xff-'9'
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sub 0xff-9
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jr c, .end
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jr c, .end
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ld b, a ; we can now use a for overflow checking
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add hl, hl ; x2
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sbc a, a ; a=0 if no overflow, a=0xFF otherwise
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; We do this to detect overflow at each step
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rl b
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ld d, h
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ld e, l ; de is x2
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add hl, hl ; x4
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rla
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rl b
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add hl, hl ; x8
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rla
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rl b
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add hl, de ; x10
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rla
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ld d, a ; a is zero unless there's an overflow
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ld e, b
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rl b
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ld d, 0
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ld e, a
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add hl, de
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adc a, a ; same as rla except affects Z
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rl b
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; Did we oveflow?
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xor a
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or b
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jr z, .loop ; No? continue
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; error, NZ already set
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exx ; HL is now string pointer, restore BC
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@ -103,49 +106,33 @@ parseDecimalC:
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; Sets Z on success.
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parseHexadecimal:
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ld a, (hl)
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call parseHex ; before "ret c" is "sub 0xfa" in parseHex
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; so carry implies not zero
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ret c ; we need at least one char
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call parseHex
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jp c, unsetZ ; we need at least one char
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push bc
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ld de, 0
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ld b, d
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ld c, d
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; The idea here is that the 4 hex digits of the result can be represented "bdce",
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; where each register holds a single digit. Then the result is simply
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; e = (c << 4) | e, d = (b << 4) | d
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; However, the actual string may be of any length, so when loading in the most
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; significant digit, we don't know which digit of the result it actually represents
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; To solve this, after a digit is loaded into a (and is checked for validity),
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; all digits are moved along, with e taking the latest digit.
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ld b, 0
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.loop:
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dec b
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inc b ; b should be 0, else we've overflowed
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jr nz, .end ; Z already unset if overflow
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ld b, d
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ld d, c
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ld c, e
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ld e, a
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inc hl
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ld a, (hl)
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call parseHex
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jr nc, .loop
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ld a, b
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add a, a \ add a, a \ add a, a \ add a, a
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or d
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ld d, a
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ld a, c
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add a, a \ add a, a \ add a, a \ add a, a
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or e
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ld e, a
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xor a ; ensure z
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.end:
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; we push to B to verify overflow
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rl e \ rl d \ rl b
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rl e \ rl d \ rl b
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rl e \ rl d \ rl b
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rl e \ rl d \ rl b
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or e
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ld e, a
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; did we overflow?
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ld a, b
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or a
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jr nz, .end ; overflow, NZ already set
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; next char
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inc hl
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ld a, (hl)
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call parseHex
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jr nc, .loop
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cp a ; ensure Z
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.end:
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pop bc
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ret
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; Parse string at (HL) as a binary value (010101) without the "0b" prefix and
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; return value in E. D is always zero.
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; HL is advanced to the character following the last successfully read char.
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@ -157,10 +144,10 @@ parseBinaryLiteral:
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add a, 0xff-'1'
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sub 0xff-1
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jr c, .end
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rlc e ; sets carry if overflow, and affects Z
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ret c ; Z unset if carry set, since bit 0 of e must be set
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rl e
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add a, e
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ld e, a
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jp c, unsetZ ; overflow
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inc hl
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jr .loop
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.end:
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@ -180,13 +167,10 @@ parseLiteral:
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ld a, (hl)
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cp 0x27 ; apostrophe
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jr z, .char
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; inline parseDecimalDigit
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add a, 0xc6 ; maps '0'-'9' onto 0xf6-0xff
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sub 0xf6 ; maps to 0-9 and carries if not a digit
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ret c
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; a already parsed so skip first few instructions of parseDecimal
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jp nz, parseDecimalSkip
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call isDigit
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ret nz
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cp '0'
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jp nz, parseDecimal
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; maybe hex, maybe binary
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inc hl
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ld a, (hl)
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@ -211,13 +195,14 @@ parseLiteral:
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ld e, (hl) ; our result
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inc hl
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cp (hl)
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; advance HL and return if good char
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jr nz, .charError ; not ending with an apostrophe
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; good char, advance HL and return
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inc hl
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ret z
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; Z unset and there's an error
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; In all error conditions, HL is advanced by 3. Rewind.
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dec hl \ dec hl \ dec hl
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; Z already set
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ret
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.charError:
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; In all error conditions, HL is advanced by 2. Rewind.
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dec hl \ dec hl
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; NZ already set
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ret
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@ -230,9 +215,9 @@ isLiteralPrefix:
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; Returns whether A is a digit
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isDigit:
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cp '0' ; carry implies not zero for cp
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ret c
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cp '9' ; zero unset for a > '9', but set for a='9'
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ret nc
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cp '0'
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jp c, unsetZ
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cp '9'+1
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jp nc, unsetZ
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cp a ; ensure Z
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ret
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1
emul/hw/sms/.gitignore
vendored
1
emul/hw/sms/.gitignore
vendored
@ -1 +0,0 @@
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||||
/sms
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||||
@ -1,15 +0,0 @@
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||||
EXTOBJS = ../../emul.o ../../libz80/libz80.o
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OBJS = sms.o vdp.o
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TARGET = sms
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CFLAGS += `pkg-config --cflags xcb`
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.PHONY: all
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all: $(TARGET)
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$(TARGET): $(OBJS) $(EXTOBJS)
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$(CC) `pkg-config --libs xcb` $(OBJS) $(EXTOBJS) -o $@
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.PHONY: clean
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clean:
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rm -f $(TARGET) $(OBJS)
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@ -1,194 +0,0 @@
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <xcb/xcb.h>
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#include "../../emul.h"
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#include "vdp.h"
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#define RAMSTART 0xc000
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#define VDP_CMD_PORT 0xbf
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#define VDP_DATA_PORT 0xbe
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#define MAX_ROMSIZE 0x8000
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static xcb_connection_t *conn;
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static xcb_screen_t *screen;
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/* graphics contexts */
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static xcb_gcontext_t fg;
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/* win */
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static xcb_drawable_t win;
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// pixels to draw. We draw them in one shot.
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static xcb_rectangle_t rectangles[VDP_SCREENW*VDP_SCREENH];
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static Machine *m;
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static VDP vdp;
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static bool vdp_changed;
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static uint8_t iord_vdp_cmd()
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{
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return vdp_cmd_rd(&vdp);
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}
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static uint8_t iord_vdp_data()
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{
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return vdp_data_rd(&vdp);
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}
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static void iowr_vdp_cmd(uint8_t val)
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{
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vdp_cmd_wr(&vdp, val);
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}
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static void iowr_vdp_data(uint8_t val)
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{
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vdp_changed = true;
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vdp_data_wr(&vdp, val);
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}
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void create_window()
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{
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uint32_t mask;
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uint32_t values[2];
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/* Create the window */
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win = xcb_generate_id(conn);
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mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
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values[0] = screen->white_pixel;
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values[1] = XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_KEY_PRESS |
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XCB_EVENT_MASK_KEY_RELEASE;
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xcb_create_window(
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conn,
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screen->root_depth,
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win,
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screen->root,
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0, 0,
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150, 150,
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10,
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XCB_WINDOW_CLASS_INPUT_OUTPUT,
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screen->root_visual,
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mask, values);
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fg = xcb_generate_id(conn);
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mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
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values[0] = screen->black_pixel;
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values[1] = 0;
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xcb_create_gc(conn, fg, screen->root, mask, values);
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||||
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/* Map the window on the screen */
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xcb_map_window(conn, win);
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||||
}
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||||
|
||||
void draw_pixels()
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||||
{
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xcb_get_geometry_reply_t *geom;
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||||
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||||
geom = xcb_get_geometry_reply(conn, xcb_get_geometry(conn, win), NULL);
|
||||
|
||||
xcb_clear_area(
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||||
conn, 0, win, 0, 0, geom->width, geom->height);
|
||||
// Figure out inner size to maximize our screen's aspect ratio
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||||
int psize = geom->height / VDP_SCREENH;
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||||
if (geom->width / VDP_SCREENW < psize) {
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||||
// width is the constraint
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||||
psize = geom->width / VDP_SCREENW;
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||||
}
|
||||
int innerw = psize * VDP_SCREENW;
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||||
int innerh = psize * VDP_SCREENH;
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||||
int innerx = (geom->width - innerw) / 2;
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||||
int innery = (geom->height - innerh) / 2;
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||||
int drawcnt = 0;
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||||
for (int i=0; i<VDP_SCREENW; i++) {
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||||
for (int j=0; j<VDP_SCREENH; j++) {
|
||||
if (vdp_pixel(&vdp, i, j)) {
|
||||
int x = innerx + (i*psize);
|
||||
int y = innery + (j*psize);
|
||||
rectangles[drawcnt].x = x;
|
||||
rectangles[drawcnt].y = y;
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||||
rectangles[drawcnt].height = psize;
|
||||
rectangles[drawcnt].width = psize;
|
||||
drawcnt++;
|
||||
}
|
||||
}
|
||||
}
|
||||
if (drawcnt) {
|
||||
xcb_poly_fill_rectangle(
|
||||
conn, win, fg, drawcnt, rectangles);
|
||||
}
|
||||
vdp_changed = false;
|
||||
xcb_flush(conn);
|
||||
}
|
||||
|
||||
void event_loop()
|
||||
{
|
||||
while (1) {
|
||||
emul_step();
|
||||
if (vdp_changed) {
|
||||
// To avoid overdrawing, we'll let the CPU run a bit to finish its
|
||||
// drawing operation.
|
||||
emul_steps(100);
|
||||
draw_pixels();
|
||||
}
|
||||
xcb_generic_event_t *e = xcb_poll_for_event(conn);
|
||||
if (!e) {
|
||||
continue;
|
||||
}
|
||||
switch (e->response_type & ~0x80) {
|
||||
/* ESC to exit */
|
||||
case XCB_KEY_RELEASE:
|
||||
case XCB_KEY_PRESS: {
|
||||
xcb_key_press_event_t *ev = (xcb_key_press_event_t *)e;
|
||||
if (ev->detail == 0x09) return;
|
||||
break;
|
||||
}
|
||||
case XCB_EXPOSE: {
|
||||
draw_pixels();
|
||||
break;
|
||||
}
|
||||
default: {
|
||||
break;
|
||||
}
|
||||
}
|
||||
free(e);
|
||||
}
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
if (argc != 2) {
|
||||
fprintf(stderr, "Usage: ./sms /path/to/rom\n");
|
||||
return 1;
|
||||
}
|
||||
FILE *fp = fopen(argv[1], "r");
|
||||
if (fp == NULL) {
|
||||
fprintf(stderr, "Can't open %s\n", argv[1]);
|
||||
return 1;
|
||||
}
|
||||
m = emul_init();
|
||||
m->ramstart = RAMSTART;
|
||||
int i = 0;
|
||||
int c;
|
||||
while ((c = fgetc(fp)) != EOF && i < MAX_ROMSIZE) {
|
||||
m->mem[i++] = c & 0xff;
|
||||
}
|
||||
pclose(fp);
|
||||
if (c != EOF) {
|
||||
fprintf(stderr, "ROM image too large.\n");
|
||||
return 1;
|
||||
}
|
||||
vdp_init(&vdp);
|
||||
vdp_changed = false;
|
||||
m->iord[VDP_CMD_PORT] = iord_vdp_cmd;
|
||||
m->iord[VDP_DATA_PORT] = iord_vdp_data;
|
||||
m->iowr[VDP_CMD_PORT] = iowr_vdp_cmd;
|
||||
m->iowr[VDP_DATA_PORT] = iowr_vdp_data;
|
||||
conn = xcb_connect(NULL, NULL);
|
||||
screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
|
||||
create_window();
|
||||
draw_pixels();
|
||||
event_loop();
|
||||
emul_printdebug();
|
||||
return 0;
|
||||
}
|
||||
@ -1,77 +0,0 @@
|
||||
#include <string.h>
|
||||
#include "vdp.h"
|
||||
|
||||
void vdp_init(VDP *vdp)
|
||||
{
|
||||
memset(vdp->vram, 0, VDP_VRAM_SIZE);
|
||||
memset(vdp->regs, 0, 0x10);
|
||||
vdp->has_cmdlsb = false;
|
||||
vdp->curaddr = 0;
|
||||
}
|
||||
|
||||
uint8_t vdp_cmd_rd(VDP *vdp)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
void vdp_cmd_wr(VDP *vdp, uint8_t val)
|
||||
{
|
||||
if (!vdp->has_cmdlsb) {
|
||||
vdp->cmdlsb = val;
|
||||
vdp->has_cmdlsb = true;
|
||||
return;
|
||||
}
|
||||
vdp->has_cmdlsb = false;
|
||||
if ((val & 0xc0) == 0x80) {
|
||||
// set register
|
||||
vdp->regs[val&0xf] = vdp->cmdlsb;
|
||||
} else if ((val & 0xc0) == 0xc0) {
|
||||
// palette RAM
|
||||
vdp->curaddr = 0x4000 + (vdp->cmdlsb&0x1f);
|
||||
} else {
|
||||
// VRAM
|
||||
vdp->curaddr = ((val&0x3f) << 8) + vdp->cmdlsb;
|
||||
}
|
||||
}
|
||||
|
||||
uint8_t vdp_data_rd(VDP *vdp)
|
||||
{
|
||||
uint8_t res = vdp->vram[vdp->curaddr];
|
||||
if (vdp->curaddr < VDP_VRAM_SIZE) {
|
||||
vdp->curaddr++;
|
||||
}
|
||||
return res;
|
||||
}
|
||||
|
||||
void vdp_data_wr(VDP *vdp, uint8_t val)
|
||||
{
|
||||
vdp->vram[vdp->curaddr] = val;
|
||||
if (vdp->curaddr < VDP_VRAM_SIZE) {
|
||||
vdp->curaddr++;
|
||||
}
|
||||
}
|
||||
|
||||
uint8_t vdp_pixel(VDP *vdp, uint16_t x, uint16_t y)
|
||||
{
|
||||
if (x >= VDP_SCREENW) {
|
||||
return 0;
|
||||
}
|
||||
if (y >= VDP_SCREENH) {
|
||||
return 0;
|
||||
}
|
||||
// name table offset
|
||||
uint16_t offset = 0x3800 + ((y/8) << 6) + ((x/8) << 1);
|
||||
uint16_t tableval = vdp->vram[offset] + (vdp->vram[offset+1] << 8);
|
||||
uint16_t tilenum = tableval & 0x1ff;
|
||||
// tile offset this time. Each tile is 0x20 bytes long.
|
||||
offset = tilenum * 0x20;
|
||||
// Each 4 byte is a row. Find row first.
|
||||
offset += ((y%8) * 4);
|
||||
uint8_t bitnum = 7 - (x%8);
|
||||
// Now, let's compose the result by pushing the right bit of our 4 bytes
|
||||
// into our result.
|
||||
return ((vdp->vram[offset] >> bitnum) & 1) + \
|
||||
(((vdp->vram[offset+1] >> bitnum) & 1) << 1) + \
|
||||
(((vdp->vram[offset+2] >> bitnum) & 1) << 2) + \
|
||||
(((vdp->vram[offset+3] >> bitnum) & 1) << 3);
|
||||
}
|
||||
@ -1,26 +0,0 @@
|
||||
#include <stdint.h>
|
||||
#include <stdbool.h>
|
||||
|
||||
#define VDP_VRAM_SIZE 0x4020
|
||||
#define VDP_SCREENW (32*8)
|
||||
#define VDP_SCREENH (24*8)
|
||||
// Offset of the name table
|
||||
#define VDP_NTABLE_OFFSET 0x3800
|
||||
|
||||
|
||||
typedef struct {
|
||||
// the last 0x20 is palette RAM
|
||||
uint8_t vram[VDP_VRAM_SIZE];
|
||||
uint8_t regs[0x10];
|
||||
uint8_t cmdlsb;
|
||||
bool has_cmdlsb;
|
||||
uint16_t curaddr;
|
||||
} VDP;
|
||||
|
||||
void vdp_init(VDP *vdp);
|
||||
uint8_t vdp_cmd_rd(VDP *vdp);
|
||||
void vdp_cmd_wr(VDP *vdp, uint8_t val);
|
||||
uint8_t vdp_data_rd(VDP *vdp);
|
||||
void vdp_data_wr(VDP *vdp, uint8_t val);
|
||||
// result is a RGB value
|
||||
uint8_t vdp_pixel(VDP *vdp, uint16_t x, uint16_t y);
|
||||
@ -38,7 +38,6 @@ vdpInit:
|
||||
ld c, VDP_CTLPORT
|
||||
otir
|
||||
|
||||
; Blank VRAM
|
||||
xor a
|
||||
out (VDP_CTLPORT), a
|
||||
ld a, 0x40
|
||||
@ -52,17 +51,15 @@ vdpInit:
|
||||
or c
|
||||
jr nz, .loop1
|
||||
|
||||
; Set palettes
|
||||
xor a
|
||||
out (VDP_CTLPORT), a
|
||||
ld a, 0xc0
|
||||
out (VDP_CTLPORT), a
|
||||
xor a ; palette 0: black
|
||||
out (VDP_DATAPORT), a
|
||||
ld a, 0x3f ; palette 1: white
|
||||
out (VDP_DATAPORT), a
|
||||
ld hl, vdpPaletteData
|
||||
ld b, vdpPaletteDataEnd-vdpPaletteData
|
||||
ld c, VDP_DATAPORT
|
||||
otir
|
||||
|
||||
; Define tiles
|
||||
xor a
|
||||
out (VDP_CTLPORT), a
|
||||
ld a, 0x40
|
||||
@ -100,7 +97,6 @@ vdpInit:
|
||||
dec c
|
||||
jr nz, .loop2
|
||||
|
||||
; Bit 7 = ?, Bit 6 = display enabled
|
||||
ld a, 0b11000000
|
||||
out (VDP_CTLPORT), a
|
||||
ld a, 0x81
|
||||
@ -133,7 +129,7 @@ vdpSpitC:
|
||||
; two bits
|
||||
out (VDP_CTLPORT), a
|
||||
ld a, b ; 3 low bits set
|
||||
or 0x78 ; 01 header + 0x3800
|
||||
or 0x78
|
||||
out (VDP_CTLPORT), a
|
||||
pop bc
|
||||
|
||||
@ -283,16 +279,11 @@ vdpConv:
|
||||
ld a, 0x5e
|
||||
ret
|
||||
|
||||
vdpPaletteData:
|
||||
.db 0x00,0x3f
|
||||
vdpPaletteDataEnd:
|
||||
|
||||
; VDP initialisation data
|
||||
vdpInitData:
|
||||
; 0x8x == set register X
|
||||
.db 0b00000100, 0x80 ; Bit 2: Select mode 4
|
||||
.db 0b00000000, 0x81
|
||||
.db 0b11111111, 0x82 ; Name table: 0x3800
|
||||
.db 0b11111111, 0x85 ; Sprite table: 0x3f00
|
||||
.db 0b11111111, 0x86 ; sprite use tiles from 0x2000
|
||||
.db 0b11111111, 0x87 ; Border uses palette 0xf
|
||||
.db 0b00000000, 0x88 ; BG X scroll
|
||||
.db 0b00000000, 0x89 ; BG Y scroll
|
||||
.db 0b11111111, 0x8a ; Line counter (why have this?)
|
||||
.db 0x04,0x80,0x00,0x81,0xff,0x82,0xff,0x85,0xff,0x86,0xff,0x87,0x00,0x88,0x00,0x89,0xff,0x8a
|
||||
vdpInitDataEnd:
|
||||
|
||||
Loading…
Reference in New Issue
Block a user