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Better PPU design

This commit is contained in:
neauoire 2021-02-09 10:58:06 -08:00
parent 56ca1091b4
commit 17578d8bbb
7 changed files with 86 additions and 54 deletions
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12
build.sh
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@ -15,14 +15,14 @@ clang-format -i uxn.c
# Cli
clang-format -i cli.c
rm -f ./bin/cli
cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined uxn.c cli.c -o bin/cli
# rm -f ./bin/cli
# cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined uxn.c cli.c -o bin/cli
# Emulator
clang-format -i emulator.c
# rm -f ./bin/emulator
# cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined uxn.c emulator.c -L/usr/local/lib -lSDL2 -o bin/emulator
rm -f ./bin/emulator
cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined uxn.c emulator.c -L/usr/local/lib -lSDL2 -o bin/emulator
# run
./bin/assembler examples/hello.usm bin/boot.rom
./bin/cli bin/boot.rom
./bin/assembler examples/pixel.usm bin/boot.rom
./bin/emulator bin/boot.rom

6
cli.c
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@ -21,15 +21,17 @@ error(char *msg, const char *err)
}
Uint8
console_onread(Uint8 b)
console_onread(Device *d, Uint8 b)
{
(void)d;
(void)b;
return 0;
}
Uint8
console_onwrite(Uint8 b)
console_onwrite(Device *d, Uint8 b)
{
(void)d;
if(b)
printf("%c", b);
return 0;

59
emulator.c
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@ -53,6 +53,13 @@ clear(Uint32 *dst)
dst[v * WIDTH + h] = theme[0];
}
void
putpixel(Uint32 *dst, int x, int y, int color)
{
if(x >= 0 && x < WIDTH - 8 && y >= 0 && y < HEIGHT - 8)
dst[(y + PAD * 8) * WIDTH + (x + PAD * 8)] = theme[color];
}
void
redraw(Uint32 *dst)
{
@ -149,34 +156,46 @@ dokey(SDL_Event *event)
#pragma mark - Devices
void
console_onread(Uint8 *b)
Uint8
console_onread(Device *d, Uint8 b)
{
(void)b;
(void)d;
return 0;
}
void
console_onwrite(Uint8 *b)
Uint8
console_onwrite(Device *d, Uint8 b)
{
if(b) {
printf("%c", *b);
(void)d;
if(b)
printf("%c", b);
fflush(stdout);
*b = 0x00;
}
return 0;
}
Uint8 ppumem[5];
void
ppur(Uint8 *b)
Uint8
ppur(Device *d, Uint8 b)
{
(void)b;
(void)d;
return 0;
}
void
ppuw(Uint8 *b)
Uint8
ppuw(Device *d, Uint8 b)
{
printf("%02x\n", *b);
d->mem[d->len++] = b;
if(d->len > 5) {
putpixel(pixels,
(d->mem[0] << 8) + d->mem[1],
(d->mem[2] << 8) + d->mem[3],
d->mem[4]);
if(d->mem[5])
redraw(pixels);
d->len = 0;
}
return 0;
}
int
@ -207,11 +226,11 @@ start(Uxn *u)
}
}
Uxn u;
int
main(int argc, char **argv)
{
Uxn u;
if(argc < 2)
return error("Input", "Missing");
if(!bootuxn(&u))
@ -221,8 +240,8 @@ main(int argc, char **argv)
if(!init())
return error("Init", "Failed");
portuxn(&u, 0xfff0, console_onread, console_onwrite);
portuxn(&u, 0xfff2, ppur, ppuw);
portuxn(&u, "console", console_onread, console_onwrite);
portuxn(&u, "PPU", ppur, ppuw);
start(&u);

2
examples/hello.usm
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@ -4,7 +4,7 @@
|0100 @RESET
@word1 "hello_word ( len: 0x0b )
@word1 "hello_world ( len: 0x0b )
@loop
,00 IOW ( write to device#0 )

32
examples/pixel.usm
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@ -1,17 +1,27 @@
( hello world )
:stdr FFF0
:stdw FFF1
:ppur FFF2
:ppuw FFF3
( draw pixel )
|0100 @RESET
,11 ,ppuw STR ( x0 )
,23 ,ppuw STR ( x1 )
,12 ,ppuw STR ( y0 )
,34 ,ppuw STR ( y1 )
,01 ,ppuw STR ( clr )
,0001 IOW ( x0 )
,0001 IOW ( x1 )
,0001 IOW ( y0 )
,0001 IOW ( y1 )
,0101 IOW ( clr )
,0001 IOW ( noredraw )
,0001 IOW ( x0 )
,0101 IOW ( x1 )
,0001 IOW ( y0 )
,0001 IOW ( y1 )
,0201 IOW ( clr )
,0001 IOW ( noredraw )
,0001 IOW ( x0 )
,0201 IOW ( x1 )
,0001 IOW ( y0 )
,0001 IOW ( y1 )
,0301 IOW ( clr )
,0101 IOW ( redraw! )
BRK

7
uxn.c
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@ -33,8 +33,8 @@ Uint16 mempeek16(Uxn *u, Uint16 s) { return (u->ram.dat[s] << 8) + (u->ram.dat[s
void op_brk(Uxn *u) { setflag(&u->status,FLAG_HALT, 1); }
void op_lit(Uxn *u) { u->literal += u->ram.dat[u->ram.ptr++]; }
void op_nop(Uxn *u) { printf("NOP"); (void)u; }
void op_ior(Uxn *u) { Uint8 devid = wspop8(u); Uint8 devop = wspop8(u); Device *dev = &u->dev[devid]; if(dev) wspush8(u, dev->rfn(devop)); }
void op_iow(Uxn *u) { Uint8 devid = wspop8(u); Uint8 devop = wspop8(u); Device *dev = &u->dev[devid]; if(dev) dev->wfn(devop); }
void op_ior(Uxn *u) { Uint8 devid = wspop8(u); Uint16 devop = wspop8(u); Device *dev = &u->dev[devid]; if(devid < u->devices) wspush8(u, dev->rfn(dev,devop)); }
void op_iow(Uxn *u) { Uint8 devid = wspop8(u); Uint16 devop = wspop8(u); Device *dev = &u->dev[devid]; if(devid < u->devices) dev->wfn(dev,devop); }
void op_ldr(Uxn *u) { Uint16 a = wspop16(u); wspush8(u, u->ram.dat[a]); }
void op_str(Uxn *u) { Uint16 a = wspop16(u); Uint8 b = wspop8(u); u->ram.dat[a] = b; }
/* Logic */
@ -187,11 +187,12 @@ loaduxn(Uxn *u, char *filepath)
/* to start: evaluxn(u, u->vreset); */
int
portuxn(Uxn *u, char *name, Uint8 (*onread)(Uint8), Uint8 (*onwrite)(Uint8))
portuxn(Uxn *u, char *name, Uint8 (*onread)(Device *, Uint8), Uint8 (*onwrite)(Device *, Uint8))
{
Device *d = &u->dev[u->devices++];
d->rfn = onread;
d->wfn = onwrite;
d->len = 0;
printf("Device#%d: %s \n", u->devices, name);
return 1;
}

10
uxn.h
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@ -34,10 +34,10 @@ typedef struct {
Uint8 dat[65536];
} Memory;
typedef struct {
Uint16 index;
Uint8 (*rfn)(Uint8);
Uint8 (*wfn)(Uint8);
typedef struct Device {
Uint8 len, mem[8];
Uint8 (*rfn)(struct Device *, Uint8);
Uint8 (*wfn)(struct Device *, Uint8);
} Device;
typedef struct {
@ -54,4 +54,4 @@ int getflag(Uint8 *status, char flag);
int loaduxn(Uxn *c, char *filepath);
int bootuxn(Uxn *c);
int evaluxn(Uxn *u, Uint16 vec);
int portuxn(Uxn *u, char *name, Uint8 (*onread)(Uint8), Uint8 (*onwrite)(Uint8));
int portuxn(Uxn *u, char *name, Uint8 (*onread)(Device *, Uint8), Uint8 (*onwrite)(Device *, Uint8));