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ppu3.cpp
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ppu3.cpp
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#include "ppu3.h"
#include "nes_constants.h"
#include <assert.h>
#include <list>
#include <iostream>
#define ORIGIN 4
ppu::ppu(rom& romi, int res) : cart(romi), screen(1), scroll_shifts(0), frame(0) {
if(screen.dummy) {
dummy = true;
}
else {
dummy = false;
}
//cout<<"Start ppu constructor"<<endl;
//cout<<"\tRes: "<<res<<endl;
//cout<<"End ppu constructor"<<endl<<endl;
s.cycles = 0;
s.reads = 0;
s.twok2_reads = 0;
s.writes = 0;
s.dmas = 0;
s.reads_during_render = 0;
s.writes_during_render = 0;
frame = 0;
cleared_vsync = false;
late_vsync_clear = false;
spr_overflow_cycle = -1;
spr_hit0_cycle = -1;
recalc_overflow = true;
recalc_s0 = true;
table_view = false;
init_scroll_x = init_scroll_y = 0;
cycles_per_frame = CLK_PER_LINE * LINE_PER_FRAME;
set_mirror(cart.get_mode());
for(int i=0; i < 0x20; ++i)
pal[i] = &(palette[i]);
pal[0x10] = &(palette[0]);
pal[0x14] = &(palette[4]);
pal[0x18] = &(palette[8]);
pal[0x1C] = &(palette[0x0c]);
//tile_cache[table#][tile#][pal#][hflip][vflip]
// SDL_Surface * tile_cache[2][256][8][2][2];
for(int table = 0; table < 2; ++table) {
for(int tile = 0; tile < 256; ++tile) {
for(int palette = 0; palette < 8; ++palette) {
for(int hflip = 0; hflip < 2; ++hflip) {
for(int vflip = 0; vflip < 2; ++vflip) {
tile_cache[table][tile][palette][hflip][vflip] = NULL;
}
}
}
}
}
}
void ppu::set_mirror(unsigned int mode) {
if(mode == VERT) {
nt[0] = &(name_table[NT0_OFFSET]);
nt[2] = nt[0];
at[0] = &(name_table[AT0_OFFSET]);
at[2] = at[0];
nt[1] = &(name_table[NT1_OFFSET]);
nt[3] = nt[1];
at[1] = &(name_table[AT1_OFFSET]);
at[3] = at[1];
}
else if(mode == HORIZ) {
nt[0] = &(name_table[NT0_OFFSET]);
nt[1] = nt[0];
at[0] = &(name_table[AT0_OFFSET]);
at[1] = at[0];
nt[2] = &(name_table[NT1_OFFSET]);
nt[3] = nt[2];
at[2] = &(name_table[AT1_OFFSET]);
at[3] = at[2];
}
else if(mode == FOUR_SCR) {
nt[0] = &(name_table[NT0_OFFSET]);
at[0] = &(name_table[AT0_OFFSET]);
nt[1] = &(name_table[NT1_OFFSET]);
at[1] = &(name_table[AT1_OFFSET]);
nt[2] = &(name_table[NT2_OFFSET]);
at[2] = &(name_table[AT2_OFFSET]);
nt[3] = &(name_table[NT3_OFFSET]);
at[3] = &(name_table[AT3_OFFSET]);
}
else { cout<<"WTF? Unrecognized mirror mode."<<endl;}
}
void ppu::clear_surfaces(bool bank) {
if(!bank)
for(int tile = 0; tile < 256; ++tile)
for(int palette = 0; palette < 8; ++palette)
unget_Surface(0,tile,palette);
else
for(int tile = 0; tile < 256; ++tile)
for(int palette = 0; palette < 8; ++palette)
unget_Surface(1,tile,palette);
}
const std::string ppu::phases[] = {std::string("DUNNO"),
std::string("VINT"),
std::string("PRE-RENDER"),
std::string("RENDER"),
std::string("POST-RENDER"),
std::string("DISABLED")};
ppu::~ppu() {
//cout<<"Start ppu desctructor"<<endl;
cout<<"Reads: "<<s.reads<<" ("<<s.twok2_reads<<" to 0x2002, "<<s.reads_during_render<<" during render) Writes: "<<s.writes<<" ("<<s.writes_during_render<<" during render) DMAs: "<<(s.dmas/256)<<endl<<"Total cycles: "<<s.cycles<<" Total frames: "<<frame<<endl;
clear_surfaces(false);
clear_surfaces(true);
while(scroll_shifts.size() > 0) scroll_shifts.pop_front();
//cout<<"End ppu destructor"<<endl<<endl;
}
void ppu::dma(unsigned char val, unsigned int cycle) {
//cout<<"DMA from 0x"<<hex<<val<<dec<<"00"<<endl;
reg_write(0x2004, val, cycle);
++s.dmas;
}
const ppu::ppu_phase ppu::phase(const unsigned int cycle) {
int odd_diff = ((frame % 2 == 0)?0:1);
ppu_phase choice = DUNNO;
if(!control1.bits.show_bg && !control1.bits.show_sprites) choice = DISABLED; //DISABLED
else if(cycle < (unsigned int)(VINT_LINES * CLK_PER_LINE)) choice = VINT; //VINT
else if(cycle < (unsigned int)((VINT_LINES + PRE_RENDER_LINES) * CLK_PER_LINE - odd_diff)) choice = PRE_RENDER; //PRE_RENDER
else if(cycle < (unsigned int)((VINT_LINES + PRE_RENDER_LINES + RENDER_LINES) * CLK_PER_LINE) - odd_diff) choice = RENDER; //RENDER
else if(cycle < (unsigned int)((VINT_LINES + PRE_RENDER_LINES + RENDER_LINES + POST_RENDER_LINES) * CLK_PER_LINE) - odd_diff) choice = POST_RENDER; //POST_RENDER
return choice;
}
unsigned int ppu::s0_hit_cycle(unsigned int cycle) {
//TODO: This is an inexact estimate. It needs fixed, sometime.
// (Better than the last version of the estimate, though ;-)
if(recalc_s0) {
if(sprites[0].y + 1 > 239) spr_hit0_cycle = -1;
else {
int spry = sprites[0].y + 1;
int sprx = sprites[0].x;
bool hf = sprites[0].hflip;
bool vf = sprites[0].vflip;
int palnum = sprites[0].pal | 4;
int tile = sprites[0].tile;
int table = control0.sprite_table;
SDL_Surface * s = get_Surface(table, tile, palnum, hf, vf);
int px = -1;
int py = -1;
for(int x = 0; x < 8; ++x)
for(int y = 0; y < 8; ++y) {
unsigned char t =((unsigned char *)s->pixels)[y*(s->pitch)+x];
if(t != NES_TRANSPARENT) {
px = x; py = y; /*cout<<"x: "<<x<<" y: "<<y<<" val: "<<int(t)<<endl;*/ goto loop_exit;
}
}
loop_exit:
if(px == -1) spr_hit0_cycle = -1;
else spr_hit0_cycle = ((spry + 1 + py) * CLK_PER_LINE + sprx + px);
recalc_s0 = false;
}
}
return spr_hit0_cycle;
}
unsigned int ppu::overflow_cycle(unsigned int cycle) {
if(recalc_overflow) {
int lines[240] = {0};
spr_overflow_cycle = 0;
for(int sprite = 0; sprite < 64; ++sprite) { //For each sprite...
//Increment sprite count for each line that the sprite is visible on
for(int y = sprites[sprite].y; (y < sprites[sprite].y + 8 + (control0.big_sprites * 8)) && y < 240; ++y)
++lines[y];
}
for(int line = 0; line < 240; ++line) {
if(lines[line] > 8) {
spr_overflow_cycle = line * CLK_PER_LINE;
break;
}
}
//if no overflow found, set the overflow value out of range (ie no overflow occurs)
if(spr_overflow_cycle == 0) spr_overflow_cycle = -1;
recalc_overflow = false;
}
return spr_overflow_cycle;
}
void ppu::reg_write(const unsigned int addr,const unsigned char val, const unsigned int cycle) {
//cout<<"!! "<<phases[phase(cycle)]<<" Write address: 0x"<<hex<<addr<<" Value: 0x"<<int(val)<<dec<<" Cycle: "<<cycle<<endl;
ppu_phase curphase = phase(cycle);
if(curphase == RENDER) ++s.writes_during_render;
switch(addr) {
case 0x2000:
{
int bg_table = control0.bg_table;
int spr_table = control0.sprite_table;
control0.reg = val;
vram_ptr_reset.fields.page_y = (control0.base_addr & 2)/2;
vram_ptr_reset.fields.page_x = (control0.base_addr & 1);
int xscroll = (control0.base_addr%2) * 32 + vram_ptr_reset.fields.tile_x;
int yscroll = (control0.base_addr/2) * 30 + vram_ptr_reset.fields.tile_y;
if(curphase != RENDER && curphase != POST_RENDER) { //keeps track of where the screen will start
set_scroll(xscroll*8+fine_x, yscroll*8+vram_ptr_reset.fields.fine_y);
cart.ppu_change(cycle, BG_CHANGE_ADDR, control0.bg_table);
cart.ppu_change(cycle, SPR_CHANGE_ADDR, control0.sprite_table);
//if(control0.bg_table != bg_table) cout<<"Changed the bg table (to "<<control0.bg_table<<"), cycle: "<<cycle<<endl;
//if(control0.sprite_table != spr_table) cout<<"Changed the sprite table (to "<<control0.sprite_table<<"), cycle: "<<cycle<<endl;
} else { //keeps track of when (during rendering) the reset shifts, but only worry about the X reset
set_scroll(xscroll*8+fine_x, yscroll*8+vram_ptr_reset.fields.fine_y, cycle%CLK_PER_LINE, cycle/CLK_PER_LINE);
if(control0.bg_table != bg_table) {
//cout<<"Changed the bg table mid-frame! (to "<<control0.bg_table<<"), cycle: "<<cycle<<endl;
cart.ppu_change(cycle, BG_CHANGE_ADDR, 1 - control0.bg_table);
}
if(control0.sprite_table != spr_table) {
//cout<<"Changed the sprite table mid-frame! (to "<<control0.sprite_table<<"), cycle: "<<cycle<<endl;
cart.ppu_change(cycle, SPR_CHANGE_ADDR, 1 - control0.sprite_table);
}
}
}
break;
case 0x2001:
/*
cout<<"Wrote "<<hex<<val<<dec<<" to 2001 (Color disabled: "<<control1.bits.color_disabled
<<" show left bg: "<<control1.bits.show_left_bg<<" show left sprites: "<<control1.bits.show_left_sprites
<<" show bg: "<<control1.bits.show_bg<<" show sprites: "<<control1.bits.show_sprites<<endl;
*/
control1.reg = val;
break;
case 0x2003:
spraddr = val;
break;
case 0x2004:
if(spraddr/4 == 0) recalc_s0 = true;
recalc_overflow = true;
sprites[spraddr/4].val[spraddr%4] = val;
spraddr++;
break;
case 0x2005:
if(!scroll_latch) {
vram_ptr_reset.fields.tile_x = (val & 0xf8)>>(3) ;
fine_x = (val & 0x7);
//cout<<"Set X reset to ("<<(control0.base_addr&1)*256+vram_ptr_reset.fields.tile_x*8+fine_x<<", "
// <<(control0.base_addr&2)*120+vram_ptr_reset.fields.tile_y*8+vram_ptr_reset.fields.fine_y<<") at cycle "
// <<cycle<<" ("<<cycle/CLK_PER_LINE<<", "<<cycle%CLK_PER_LINE<<") ("<<phases[curphase]<<")"<<endl;
}
else {
vram_ptr_reset.fields.tile_y = (val & 0xf8)>>(3);
vram_ptr_reset.fields.fine_y = (val & 0x7);
//cout<<"Set Y reset to ("<<(control0.base_addr&1)*256+vram_ptr_reset.fields.tile_x*8+fine_x<<", "
// <<(control0.base_addr&2)*120+vram_ptr_reset.fields.tile_y*8+vram_ptr_reset.fields.fine_y<<") at cycle "
// <<cycle<<" ("<<cycle/CLK_PER_LINE<<", "<<cycle%CLK_PER_LINE<<") ("<<phases[curphase]<<")"<<endl;
}
if(curphase != RENDER) { //keeps track of where the screen will start
int xscroll = (control0.base_addr%2) * 32 + vram_ptr_reset.fields.tile_x;
int yscroll = (control0.base_addr/2) * 30 + vram_ptr_reset.fields.tile_y;
set_scroll(xscroll*8+fine_x, yscroll*8+vram_ptr_reset.fields.fine_y);
}
else if(curphase == RENDER) { //keeps track of when (during rendering) the reset shifts, but only worry about the X reset
int xscroll = (control0.base_addr%2) * 32 + vram_ptr_reset.fields.tile_x;
int yscroll = (control0.base_addr/2) * 30 + vram_ptr_reset.fields.tile_y;
set_scroll(xscroll*8+fine_x, yscroll*8+vram_ptr_reset.fields.fine_y, cycle%CLK_PER_LINE, cycle/CLK_PER_LINE);
}
scroll_latch = !scroll_latch;
break;
case 0x2006:
if(!scroll_latch) {
vram_ptr_reset.bytes.high = val;
vram_ptr_reset.bytes.pad = 0;
}
else {
vram_ptr_reset.bytes.low = val;
vram_ptr = vram_ptr_reset;
}
if(curphase != RENDER) { //keep track of where the screen starts
int xscroll = (control0.base_addr%2) * 32 + vram_ptr_reset.fields.tile_x;
int yscroll = (control0.base_addr/2) * 30 + vram_ptr_reset.fields.tile_y;
//cout<<"2006: set scroll to ("<<yscroll<<", "<<xscroll<<")"<<endl;
set_scroll(xscroll*8+fine_x, yscroll*8+vram_ptr_reset.fields.fine_y);
}
else if(curphase == RENDER) {
int xscroll = (control0.base_addr%2) * 32 + vram_ptr_reset.fields.tile_x;
int yscroll = (control0.base_addr/2) * 30 + vram_ptr_reset.fields.tile_y;
set_scroll(xscroll*8+fine_x, yscroll*8+vram_ptr_reset.fields.fine_y, cycle%CLK_PER_LINE, cycle/CLK_PER_LINE);
}
scroll_latch = !scroll_latch;
break;
case 0x2007:
//cout<<"0x2007 (0x"<<hex<<vram_ptr.pointer<<dec<<"): "<<hex<<int(val)<<dec<<"(";
if(vram_ptr.pointer < 0x2000) {
//cout<<"Writing to Pattern Table)"<<endl;
bool wrote = cart.put_cbyte(val, vram_ptr.pointer);
if(wrote) {
int table = (vram_ptr.pointer < 0x1000)?0:1;
int tile = (vram_ptr.pointer & 0xfff) / 16;
for(int palnum = 0; palnum < 8; ++palnum) {
unget_Surface(table, tile, palnum);
}
}
}
else {
unsigned int ptr = vram_ptr.pointer;
if(ptr >= 0x3000 && ptr < 0x3F00) ptr -= 0x1000;
if(ptr < 0x23C0) {
//cout<<"Writing to Name Table 0)"<<endl;
nt[0][ptr - 0x2000] = val;
}
else if(ptr < 0x2400) {
//cout<<"Writing to Attribute Table 0)"<<endl;
at[0][ptr - 0x23C0] = val;
}
else if(ptr < 0x27C0) {
//cout<<"Writing to Name Table 1)"<<endl;
nt[1][ptr - 0x2400] = val;
}
else if(ptr < 0x2800) {
//cout<<"Writing to Attribute Table 1)"<<endl;
at[1][ptr - 0x27C0] = val;
}
else if(ptr < 0x2BC0) {
//cout<<"Writing to Name Table 2)"<<endl;
nt[2][ptr - 0x2800] = val;
}
else if(ptr < 0x2C00) {
//cout<<"Writing to Attribute Table 2)"<<endl;
at[2][ptr - 0x2BC0] = val;
}
else if(ptr < 0x2FC0) {
//cout<<"Writing to Name Table 3)"<<endl;
nt[3][ptr - 0x2C00] = val;
}
else if(ptr < 0x3000) {
//cout<<"Writing to Attribute Table 3)"<<endl;
at[3][ptr - 0x2FC0] = val;
}
else {
ptr &= 0x1f;
if(ptr < 0x10) {
//cout<<"Writing to Background Palette)"<<endl;
}
else {
//cout<<"Writing to Sprite Palette)"<<endl;
}
int oldval = *(pal[ptr]);
if(val != oldval) {
*(pal[ptr]) = (val&0x3f);
//cout<<hex<<"Palette value "<<ptr<<" changed, clearing palette "<<(ptr>>(2))<<" tiles"<<endl;
for(int table = 0; table < 2; ++table) {
for(int tile = 0; tile < 256; ++tile) {
unget_Surface(table, tile, ptr>>(2));
}
}
}
}
}
vram_ptr.pointer++;
if(control0.v_inc_down) vram_ptr.pointer +=31;
break;
default:
cout<<"Writing to register 0x"<<hex<<addr<<" isn't handled."<<dec<<endl;
break;
}
++s.writes;
}
unsigned char ppu::reg_read(const unsigned int addr, unsigned int cycle) {
//cout<<"!! "<<phases[phase(cycle)]<<" Read address: 0x"<<hex<<addr<<dec<<" Cycle: "<<cycle<<endl;
if(phase(cycle) == RENDER) ++s.reads_during_render;
unsigned char retval = 0;
switch(addr) {
case 0x2002:
if(!cleared_vsync && (phase(cycle) == VINT || cycle >= cycles_per_frame - 85)) {
retval |= 0x80;
cleared_vsync = true;
//TODO: Reduce reliance on hard-coded cycle counts
if(cycle >= cycles_per_frame - 85) late_vsync_clear = true;
}
if(s0_hit_cycle(cycle) <= cycle) {
retval |= 0x40;
}
if(overflow_cycle(cycle) <= cycle) {
retval |= 0x20;
}
scroll_latch = false;
++s.twok2_reads;
break;
case 0x2004:
retval = sprites[spraddr/4].val[spraddr%4];
break;
case 0x2007:
//cout<<"0x2007 (0x"<<hex<<vram_ptr.pointer<<dec<<"): (";
if(vram_ptr.pointer < 0x2000) {
//cout<<"Reading from Pattern Table)";
retval = ppu_ram_buffer;
ppu_ram_buffer = cart.get_cbyte(vram_ptr.pointer);
}
else {
unsigned int ptr = vram_ptr.pointer;
retval = ppu_ram_buffer;
if(ptr >= 0x3000 && ptr < 0x3F00) ptr -= 0x1000;
if(ptr < 0x23C0) {
//cout<<"Reading from Name Table 0)";
ppu_ram_buffer = nt[0][ptr - 0x2000];
}
else if(ptr < 0x2400) {
//cout<<"Reading from Attribute Table 0)";
ppu_ram_buffer = at[0][ptr - 0x23C0];
}
else if(ptr < 0x27C0) {
//cout<<"Reading from Name Table 1)";
ppu_ram_buffer = nt[1][ptr - 0x2400];
}
else if(ptr < 0x2800) {
//cout<<"Reading from Attribute Table 1)";
ppu_ram_buffer = at[1][ptr - 0x27C0];
}
else if(ptr < 0x2BC0) {
//cout<<"Reading from Name Table 2)";
ppu_ram_buffer = nt[2][ptr - 0x2800];
}
else if(ptr < 0x2C00) {
//cout<<"Reading from Attribute Table 2)";
ppu_ram_buffer = at[2][ptr - 0x2BC0];
}
else if(ptr < 0x2FC0) {
//cout<<"Reading from Name Table 3)";
ppu_ram_buffer = nt[3][ptr - 0x2C00];
}
else if(ptr < 0x3000) {
//cout<<"Reading from Attribute Table 3)";
ppu_ram_buffer = at[3][ptr - 0x2FC0];
}
else {
ptr &= 0x1f;
if(ptr < 0x10) {
//cout<<"Reading from Background Palette)";
}
else {
//cout<<"Reading from Sprite Palette)";
}
retval = *(pal[ptr]);
ppu_ram_buffer = retval;
}
}
//cout<<hex<<": 0x"<<int(retval)<<dec<<endl;
vram_ptr.pointer++;
if(control0.v_inc_down) vram_ptr.pointer +=31;
break;
default:
//cout<<"Reading from register 0x"<<hex<<addr<<" isn't handled."<<dec<<endl;
retval = control1.reg;
break;
}
++s.reads;
return retval;
}
int ppu::calc() {
int crom_update = cart.changed_crom();
if((crom_update&1) == 1) clear_surfaces(false);
if((crom_update&2) == 2) clear_surfaces(true);
//cout<<"Total cycles: "<<s.cycles<<" Total frames: "<<frame<<endl;
s.cycles += cycles_per_frame;
++frame;
if(!late_vsync_clear) {
cleared_vsync = false;
}
else late_vsync_clear = false;
if(frame % 2 == 0) cycles_per_frame = CLK_PER_LINE * LINE_PER_FRAME;
else cycles_per_frame = CLK_PER_LINE * LINE_PER_FRAME - 1;
if(table_view) {
//Draw 64 sprites, always, since I can change the blit location easily in compositor::flip()
for(int spr=63;spr>=0;--spr) {
blit_sprite(spr);
}
//Draw the palette
for(int palnum = 0; palnum < 16; ++palnum) {
for(int x=palnum*16; x < palnum*16 + 16; ++x)
for(int y=0; y < 16; ++y) {
screen.pset(x,y+480,*pal[palnum]);
screen.pset(x,y+496,*pal[palnum+16]);
}
}
//Draw the state of the name table
for(int table = 0; table < 4; ++table) {
for(int tile_x = 0; tile_x < 32; ++tile_x) {
for(int tile_y = 0; tile_y < 30; ++tile_y) {
int val = nt[table][tile_y * 32 + tile_x];
int pal = get_nt_pal(table, tile_x, tile_y);
//screen.erase_nt(x,y);
int x_offset = 0;
int y_offset = 0;
if(table == 1)
x_offset = 256;
else if(table == 2)
y_offset = 240;
else if(table == 3) {
y_offset=240;
x_offset=256;
}
screen.blit_nt(get_Surface(control0.bg_table, val, pal, 0,0), tile_x*8+x_offset, tile_y*8+y_offset);
}
}
}
for(int table = 0; table < 2; table++) {
for(int tile_y = 0; tile_y < 16; tile_y++) {
for(int tile_x = 0; tile_x < 16; tile_x++) {
for(int j=0;j<8;++j) {
for(int i=0;i<8;++i) {
int x = 768+tile_x*8+i;
int y = table*128+tile_y*8+j;
int col = get_color(table*256+tile_y*16+tile_x,i,j);
int map[] = {74, 64, 67, 71};
col = map[col];
screen.pset(x, y, col);
}
}
}
}
}
}
else if(control1.bits.show_bg) { //Normal game render
int xspix = init_scroll_x;
int yspix = init_scroll_y;
int xstile = xspix / 8;
int ystile = yspix / 8;
int xepix = xspix + 256;
int xetile = xepix / 8 + 1;
int yepix = 0;
//int yetile = 0;
int curytile = 0;
unsigned int odd_diff = ((frame % 2 == 0)?0:1);
bool process = true;
while(process) {
if(scroll_shifts.size() > 0) {
yepix = scroll_shifts.front().second + init_scroll_y;
}
else {
yepix = init_scroll_y + 240;
process = false;
}
int yetile = yepix / 8 + 1;
for(int yt = ystile; yt < yetile; ++yt) {
unsigned int curcycle = (unsigned int)((VINT_LINES + PRE_RENDER_LINES) * CLK_PER_LINE - odd_diff) + curytile * 8 * CLK_PER_LINE;
apply_updates_to(curcycle);
//Draw sprites that should show by now
if(control1.bits.show_sprites)
for(int i=0;i<64;++i)
if(sprites[i].y <= curytile * 8)
blit_sprite(i);
//Draw this line of tiles
for(int xt = xstile; xt < xetile; ++xt) {
int table = ((xt / 32) % 2) + (((yt / 30) % 2) * 2);
int tile_x = xt % 32;
int tile_y = yt % 30;
int pal = get_nt_pal(table, tile_x, tile_y);
int val = nt[table][tile_y * 32 + tile_x];
screen.blit_nt(get_Surface(control0.bg_table, val, pal, 0, 0), xt*8, yt*8);
}
++curytile;
}
//Send that region to compositor to be rendered
screen.add_nt_area(xspix, yspix, xepix, yepix);
//Process the rest of the shifts, then delete the entry
if(scroll_shifts.size() > 0) {
xspix = scroll_shifts.front().first;
xstile = xspix / 8;
xepix = xspix + 256;
xetile = xepix / 8 + 1;
yspix = yepix;
ystile = yetile - 1;
scroll_shifts.pop_front();
}
}
apply_updates_to(100000); //way past end of frame
}
if(control1.bits.show_bg || control1.bits.show_sprites) {
//Set background color
screen.fill(*pal[0]);
}
//Composite the image and display it
screen.flip();
if(control0.generate_vblank) {
//cout<<"Returning 1 (NMI vblank)"<<endl;
return 1;
}
else {
//cout<<"Returning 0 (no NMI)"<<endl;
return 0;
}
}
int ppu::get_color(int tile, int x, int y) {
if(y >= 8 || x >= 8 || tile >= 512) {
cout<<"Tile: "<<tile<<" ("<<x<<", "<<y<<") doesn't exist."<<endl;
return -1;
}
int address = tile * 16 + y;
int byte1 = cart.get_cbyte(address);
int byte2 = cart.get_cbyte(address + 8);
return ((((byte1 & (128>>(x))) > 0)?1:0) + (((byte2 & (128>>(x))) > 0)?2:0));
}
SDL_Surface * ppu::get_Surface(int table, int tile, int palnum, int hf, int vf) {
//cout<<"T: "<<table<<" t: "<<tile<<" pal: "<<palnum<<" hf: "<<hf<<" vf: "<<vf<<endl;
if(!(tile_cache[table][tile][palnum][hf][vf])) {
//build the tile (8x8 palettized)
SDL_Surface * temp = SDL_CreateRGBSurface(0,8,8,8,0,0,0,0);
SDL_SetSurfacePalette(temp, screen.get_palette());
SDL_SetColorKey(temp, SDL_TRUE, NES_TRANSPARENT);
bool needs_lock = SDL_MUSTLOCK(temp);
if(needs_lock) {
SDL_LockSurface(temp);
cout<<"Surfaces need locked!"<<endl;
}
int tilenum = table * 256 + tile;
for(int y = 0; y < 8; ++y) {
int outy;
if(vf) outy = 7 - y;
else outy = y;
for(int x = 0; x < 8; ++x) {
int outx;
if(hf) outx = 7 - x;
else outx = x;
int color = get_color(tilenum,x,y);
if(color == 0) ((uint8_t *)(temp->pixels))[outy*(temp->pitch)+outx]=NES_TRANSPARENT; //Transparent
else {
//cout<<hex<<"Palnum: "<<palnum<<" Colorpart: "<<color<<" Both: "<<((palnum<<(2))+color);
color = *(pal[(palnum<<(2)) + color]);
//cout<<" val: "<<color<<dec<<endl;
((uint8_t *)(temp->pixels))[outy*(temp->pitch)+outx]=color;
}
}
}
if(needs_lock) SDL_UnlockSurface(temp);
tile_cache[table][tile][palnum][hf][vf] = temp;
}
return tile_cache[table][tile][palnum][hf][vf];
}
void ppu::unget_Surface(int table, int tile, int palnum) {
for(int hf = 0; hf < 2; ++hf) {
for(int vf = 0; vf < 2; ++vf) {
SDL_Surface * temp = tile_cache[table][tile][palnum][hf][vf];
if(!temp) continue;
SDL_FreeSurface(temp);
tile_cache[table][tile][palnum][hf][vf] = NULL;
}
}
}
void ppu::blit_sprite(int spr) {
if(spr < 0 || spr > 63) return;
int spry = sprites[spr].y;
int sprx = sprites[spr].x;
bool priority = !sprites[spr].priority;
bool hf = sprites[spr].hflip;
bool vf = sprites[spr].vflip;
int palnum = sprites[spr].pal | 4;
int tile1 = sprites[spr].tile;
int table = control0.sprite_table;
int tile2 = -1;
if(control0.big_sprites) {
if(tile1%2 == 0)
table = 0;
else
table = 1;
tile1 &= 0xfe;
tile2 = tile1 + 1;
}
if(priority) {
if(control0.big_sprites) {
if(vf) {
screen.blit_hps(get_Surface(table,tile2,palnum,hf,vf), sprx,spry+1);
screen.blit_hps(get_Surface(table,tile1,palnum,hf,vf), sprx,spry+9);
}
else {
screen.blit_hps(get_Surface(table,tile1,palnum,hf,vf), sprx,spry+1);
screen.blit_hps(get_Surface(table,tile2,palnum,hf,vf), sprx,spry+9);
}
}
else {
screen.blit_hps(get_Surface(table,tile1,palnum,hf,vf), sprx,spry+1);
}
}
else {
if(control0.big_sprites) {
if(vf) {
screen.blit_lps(get_Surface(table,tile2,palnum,hf,vf), sprx,spry+1);
screen.blit_lps(get_Surface(table,tile1,palnum,hf,vf), sprx,spry+9);
}
else {
screen.blit_lps(get_Surface(table,tile1,palnum,hf,vf), sprx,spry+1);
screen.blit_lps(get_Surface(table,tile2,palnum,hf,vf), sprx,spry+9);
}
}
else {
screen.blit_lps(get_Surface(table,tile1,palnum,hf,vf), sprx,spry+1);
}
}
}
int ppu::get_nt_pal(int table, int tx, int ty) {
byte at_val;
at_val.val = at[table][(ty/4)*8+(tx/4)];
if(tx % 4 < 2 && ty % 4 < 2) return at_val.pairs.first;
else if(tx % 4 < 2) return at_val.pairs.third;
else if(ty % 4 < 2) return at_val.pairs.second;
else return at_val.pairs.fourth;
}
int ppu::get_frame() {
//cout<<"Returning "<<frame<<" (framecount)"<<endl;
return frame;
}
const unsigned int ppu::get_ppu_cycles(const unsigned int frame) {
return cycles_per_frame;
}
int ppu::get_s0_est() {
//cout<<"Returning S0 est: 0"<<endl;
return 0;
}
void ppu::toggle_table_view() {
table_view = !table_view;
if(table_view)
cout<<"Turn on table view"<<endl;
else
cout<<"Turn off table view"<<endl;
screen.table_view(table_view);
}
void ppu::resize(int x, int y) {
//cout<<"Resizing screen to ("<<x<<", "<<y<<")"<<endl;
screen.resize(x,y);
}
void ppu::speedup(bool up) {
screen.speedup(up);
}
//Set the (x,y) reset values for the start of a frame
void ppu::set_scroll(int x, int y) {
init_scroll_x = x;
init_scroll_y = y;
//screen.set_scroll(x,y);
}
//Notify the PPU that it's going to need to change the scroll mid-render
//rx and ry are the new reset values, mod_col and mod_row describe when the change came in
void ppu::set_scroll(int rx, int ry, int mod_col, int mod_row) {
if(scroll_shifts.size() == 0 && rx != init_scroll_x) {
//cout<<"First: Shifting scroll to "<<rx<<" at line "<<mod_row<<", frame "<<frame<<" (isx="<<init_scroll_x<<", size="<<scroll_shifts.size()<<")"<<endl;
scroll_shifts.push_back(std::make_pair(rx,mod_row));
}
else if(scroll_shifts.size() > 0 && rx != scroll_shifts.back().first) {
//cout<<"C1: "<<(scroll_shifts.size() == 0)<<" C2: "<<(rx!=init_scroll_x)<<endl;
//cout<<"Second: Shifting scroll to "<<rx<<" at line "<<mod_row<<", frame "<<frame<<" (isx="<<init_scroll_x<<", size="<<scroll_shifts.size()<<")"<<endl;
scroll_shifts.push_back(std::make_pair(rx,mod_row));
}
else {
//cout<<"Filtering this scroll."<<endl;
return;
}
}
void ppu::apply_updates_to(int curcycle) {
//If there've been any mid-screen updates, apply them at the appropriate time (accurate to 1 vertical tile-ish
rom::ppu_change_t changes = cart.cycle_forward(curcycle - (8 * 2* CLK_PER_LINE));
if(changes.lo_crom == 1) clear_surfaces(false);
if(changes.hi_crom == 1) clear_surfaces(true);
if(changes.set_horiz == 1 || changes.set_vert == 1 || changes.set_4_scr == 1) set_mirror(cart.get_mode());
if(changes.set_bg0 == 1) control0.bg_table = 0;
if(changes.set_bg1 == 1) control0.bg_table = 1;
if(changes.set_spr0 == 1) control0.sprite_table = 0;
if(changes.set_spr1 == 1) control0.sprite_table = 1;
int mode_count = changes.set_horiz + changes.set_vert + changes.set_4_scr;
if(mode_count > 1) cout<<"Multiple mirroring modes set during one vertical tile of time!"<<endl;
}
uint32_t ppu::get_buffer_color(int x, int y) {
return screen.get_color(x,y);
}
void ppu::print_name_table() {
bool vars[256] = {false};
for(int big_y=0;big_y<1;++big_y) {
for(int tile_y=0;tile_y<32;++tile_y) {
for(int big_x=0;big_x<1;++big_x) {
for(int tile_x=0;tile_x<32;++tile_x) {
printf("%02x ", name_table[tile_x+32*tile_y+1024*big_x+2048*big_y]);
if(tile_y < 30) {
vars[name_table[tile_x+32*tile_y+1024*big_x+2048*big_y]] = true;
}
}
}
printf("\n");
}
printf("\n");
}
printf("Contains these values: ");
for(int i=0;i<256;++i) if(vars[i]) printf("%02x ", i);
printf("\n");
}