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#include "ppu.h"
/*
Copyright (c) 2021 Devine Lu Linvega
Copyright (c) 2021 Andrew Alderwick
Copyright (c) 2021 Adrian "asie" Siekierka
Copyright (c) 2021 Bad Diode
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE.
*/
static Uint8 font[][8] = {
{0x00, 0x7c, 0x82, 0x82, 0x82, 0x82, 0x82, 0x7c},
{0x00, 0x30, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10},
{0x00, 0x7c, 0x82, 0x02, 0x7c, 0x80, 0x80, 0xfe},
{0x00, 0x7c, 0x82, 0x02, 0x1c, 0x02, 0x82, 0x7c},
{0x00, 0x0c, 0x14, 0x24, 0x44, 0x84, 0xfe, 0x04},
{0x00, 0xfe, 0x80, 0x80, 0x7c, 0x02, 0x82, 0x7c},
{0x00, 0x7c, 0x82, 0x80, 0xfc, 0x82, 0x82, 0x7c},
{0x00, 0x7c, 0x82, 0x02, 0x1e, 0x02, 0x02, 0x02},
{0x00, 0x7c, 0x82, 0x82, 0x7c, 0x82, 0x82, 0x7c},
{0x00, 0x7c, 0x82, 0x82, 0x7e, 0x02, 0x82, 0x7c},
{0x00, 0x7c, 0x82, 0x02, 0x7e, 0x82, 0x82, 0x7e},
{0x00, 0xfc, 0x82, 0x82, 0xfc, 0x82, 0x82, 0xfc},
{0x00, 0x7c, 0x82, 0x80, 0x80, 0x80, 0x82, 0x7c},
{0x00, 0xfc, 0x82, 0x82, 0x82, 0x82, 0x82, 0xfc},
{0x00, 0x7c, 0x82, 0x80, 0xf0, 0x80, 0x82, 0x7c},
{0x00, 0x7c, 0x82, 0x80, 0xf0, 0x80, 0x80, 0x80}};
u32 *backbuffer_bg0;
u32 *backbuffer_bg1;
static u8 dirty_tiles[20][30] = {0};
void
putcolors(Ppu *p, Uint8 *addr) {
int i;
for(i = 0; i < 4; ++i) {
Uint8
r = (*(addr + i / 2) >> (!(i % 2) << 2)) & 0x0f,
g = (*(addr + 2 + i / 2) >> (!(i % 2) << 2)) & 0x0f,
b = (*(addr + 4 + i / 2) >> (!(i % 2) << 2)) & 0x0f;
PAL_BUFFER_BG[i] = rgb15(
(r << 1) | (r >> 3),
(g << 1) | (g >> 3),
(b << 1) | (b >> 3));
}
}
void
putpixel(Ppu *p, Uint32 *layer, Uint16 x, Uint16 y, Uint8 color) {
Uint32 pos = ((y & 7) + (((x >> 3) + (y >> 3) * 30) * 8));
Uint32 shift = (x & 7) << 2;
layer[pos] = (layer[pos] & (~(0xF << shift))) | (color << shift);
dirty_tiles[y >> 3][x >> 3] = 1;
}
void
puticn(Ppu *p, Uint32 *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color,
Uint8 flipx, Uint8 flipy) {
Uint16 v, h;
for(v = 0; v < 8; v++) {
for(h = 0; h < 8; h++) {
Uint8 ch1 = ((sprite[v] >> (7 - h)) & 0x1);
// if(ch1 == 1 || (color != 0x05 && color != 0x0a && color != 0x0f))
// putpixel(p,
// layer,
// x + (flipx ? 7 - h : h),
// y + (flipy ? 7 - v : v),
// ch1 ? color % 4 : color / 4);
// TODO: Add flip options directly to the screenblock?
putpixel(p,
layer,
x + h,
y + v,
ch1 ? color & 0x3 : color >> 2);
}
}
}
void
putchr(Ppu *p, Uint32 *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color,
Uint8 flipx, Uint8 flipy) {
Uint16 v, h;
for(v = 0; v < 8; v++)
for(h = 0; h < 8; h++) {
Uint8 ch1 = ((sprite[v] >> (7 - h)) & 0x1) * color;
Uint8 ch2 = ((sprite[v + 8] >> (7 - h)) & 0x1) * color;
putpixel(p,
layer,
x + (flipx ? 7 - h : h),
y + (flipy ? 7 - v : v),
(((ch1 + ch2 * 2) + color / 4) & 0x3));
}
}
void
flipbuf(Ppu *p) {
Tile *mem_fg = &TILE_MEM[0];
Tile *mem_bg = &TILE_MEM[2];
for (size_t j = 0; j < 20; ++j) {
for (size_t i = 0; i < 30; ++i) {
if (dirty_tiles[j][i] != 0) {
Tile *tile_fg = p->fg;
Tile *tile_bg = p->bg;
mem_fg[i + j * 30] = tile_fg[i + j * 30];
mem_bg[i + j * 30] = tile_bg[i + j * 30];
dirty_tiles[j][i] = 0;
}
}
}
}
int
initppu(Ppu *p, Uint8 hor, Uint8 ver, Uint8 pad) {
p->hor = hor;
p->ver = ver;
p->pad = pad;
p->width = (8 * p->hor + p->pad * 2);
p->height = (8 * p->ver + p->pad * 2);
// Initialize display mode and bg palette.
DISP_CTRL = DISP_MODE_0 | DISP_BG_0 | DISP_BG_1;
// Initialize backgrounds.
u8 cb_fg = 0;
u8 cb_bg = 2;
u8 sb_idx = 10;
BG_CTRL(0) = BG_CHARBLOCK(cb_fg) | BG_SCREENBLOCK(sb_idx) | BG_PRIORITY(1);
BG_CTRL(1) = BG_CHARBLOCK(cb_bg) | BG_SCREENBLOCK(sb_idx) | BG_PRIORITY(2);
backbuffer_bg0 = malloc(30 * 20 * sizeof(Tile));
backbuffer_bg1 = malloc(30 * 20 * sizeof(Tile));
// Clear tile memory.
p->fg = &TILE_MEM[cb_fg];
p->bg = &TILE_MEM[cb_bg];
p->fg = backbuffer_bg0;
p->bg = backbuffer_bg1;
for (size_t i = 0; i < 30 * 20 * 8; ++i) {
p->fg[i] = 0;
p->bg[i] = 0;
}
// Initialize default palette.
PAL_BUFFER_BG[0] = COLOR_BLACK;
PAL_BUFFER_BG[1] = COLOR_WHITE;
PAL_BUFFER_BG[2] = COLOR_RED;
PAL_BUFFER_BG[3] = COLOR_BLUE;
// Initialize memory map.
u16 *mem_map = SCREENBLOCK_MEM[sb_idx];
size_t k = 0;
for (size_t j = 0; j < 20; ++j) {
for (size_t i = 0; i < 30; ++i, ++k) {
mem_map[i + j * 32] = k;
}
}
return 1;
}
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