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use color palettes. yay, another layer of lookup

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This commit is contained in:
Matthew Laux 2022-08-03 19:34:56 -05:00
parent b0147a60d4
commit d6b6988742
2 changed files with 35 additions and 21 deletions
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23
cli/imgui_example.cpp
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@ -62,7 +62,16 @@ GLuint make_output_texture() {
return image_texture;
}
unsigned char default_palette[] = { 0xff, 0xaa, 0x55, 0x00 };
unsigned int default_palette[] = { 0x9ff4e5, 0x00b9be, 0x005f8c, 0x002b59 };
// ugly evenly spaced: { 0xffffff, 0xaaaaaa, 0x555555, 0x000000 };
// bgb default: {0xe0f8d0, 0x88c070, 0x346856, 0x081820};
// https://lospec.com/palette-list/blk-aqu4
// { 0x9ff4e5, 0x00b9be, 0x005f8c, 0x002b59 };
// https://lospec.com/palette-list/velvet-cherry-gb
// { 0x9775a6, 0x683a68, 0x412752, 0x2d162c };
void convert_output(struct lcd *lcd) {
int x, y;
@ -72,9 +81,9 @@ void convert_output(struct lcd *lcd) {
int val = lcd->buf[y * 256 + x];
int fill = default_palette[val];
//int fill = val ? 255 : 0;
output_image[out_index++] = fill;
output_image[out_index++] = fill;
output_image[out_index++] = fill;
output_image[out_index++] = (fill >> 16) & 0xff;
output_image[out_index++] = (fill >> 8) & 0xff;
output_image[out_index++] = fill & 0xff;
output_image[out_index++] = 255;
}
}
@ -83,9 +92,9 @@ void convert_output(struct lcd *lcd) {
for (x = 0; x < 160; x++) {
int val = lcd->pixels[y * 160 + x];
int fill = default_palette[val];
visible_pixels[out_index++] = fill;
visible_pixels[out_index++] = fill;
visible_pixels[out_index++] = fill;
visible_pixels[out_index++] = (fill >> 16) & 0xff;
visible_pixels[out_index++] = (fill >> 8) & 0xff;
visible_pixels[out_index++] = fill & 0xff;
visible_pixels[out_index++] = 255;
}
}

33
src/dmg.c
View File

@ -150,6 +150,7 @@ static void render_background(struct dmg *dmg, int lcdc)
int bg_base = (lcdc & LCDC_BG_TILE_MAP) ? 0x9c00 : 0x9800;
int window_base = (lcdc & LCDC_WINDOW_TILE_MAP) ? 0x9c00 : 0x9800;
int use_unsigned = lcdc & LCDC_BG_TILE_DATA;
int palette = lcd_read(dmg->lcd, REG_BGP);
int tilebase = use_unsigned ? 0x8000 : 0x9000;
//printf("%04x %04x %04x\n", bg_base, window_base, tilebase);
@ -166,13 +167,14 @@ static void render_background(struct dmg *dmg, int lcdc)
} else {
eff_addr = tilebase + 16 * (signed char) tile;
}
int b, i;
int b, i, col_index;
for (b = 0; b < 16; b += 2) {
int data1 = dmg_read(dmg, eff_addr + b);
int data2 = dmg_read(dmg, eff_addr + b + 1);
for (i = 7; i >= 0; i--) {
dmg->lcd->buf[off] = ((data1 & (1 << i)) ? 1 : 0) << 1;
dmg->lcd->buf[off] |= (data2 & (1 << i)) ? 1 : 0;
col_index = (data1 & (1 << i)) ? 1 : 0;
col_index |= ((data2 & (1 << i)) ? 1 : 0) << 1;
dmg->lcd->buf[off] = (palette >> (col_index << 1)) & 3;
off++;
}
off += 248;
@ -202,23 +204,26 @@ static void render_objs(struct dmg *dmg)
if (oam->pos_x == 0 || oam->pos_x >= 168) {
continue;
}
int first_tile = 0x8000 + 16 * oam->tile;
int palette = oam->attrs & OAM_ATTR_PALETTE
? lcd_read(dmg->lcd, REG_OBP1)
: lcd_read(dmg->lcd, REG_OBP0);
lcd_x = oam->pos_x - 8;
lcd_y = oam->pos_y - 16;
off = 160 * lcd_y + lcd_x;
int eff_addr = 0x8000 + 16 * oam->tile;
int b, i, limit = 16;
int b, i, tile_bytes = 16;
if (tall) {
limit = 32;
tile_bytes = 32;
}
for (b = 0; b < limit; b += 2) {
for (b = 0; b < tile_bytes; b += 2) {
int use_tile = b;
if (oam->attrs & OAM_ATTR_MIRROR_Y) {
use_tile = (limit - 2) - b;
use_tile = (tile_bytes - 2) - b;
}
int data1 = dmg_read(dmg, eff_addr + use_tile);
int data2 = dmg_read(dmg, eff_addr + use_tile + 1);
int data1 = dmg_read(dmg, first_tile + use_tile);
int data2 = dmg_read(dmg, first_tile + use_tile + 1);
for (i = 7; i >= 0; i--) {
if (off < 0 || off >= 160 * 144) {
// terrible clipping. need to not have an if per-pixel
@ -228,10 +233,10 @@ static void render_objs(struct dmg *dmg)
if (oam->attrs & OAM_ATTR_MIRROR_X) {
use_index = 7 - i;
}
int color = ((data1 & (1 << use_index)) ? 1 : 0) << 1
| ((data2 & (1 << use_index)) ? 1 : 0);
if (color) {
dmg->lcd->pixels[off] = color;
int col_index = ((data1 & (1 << use_index)) ? 1 : 0)
| ((data2 & (1 << use_index)) ? 1 : 0) << 1;
if (col_index) {
dmg->lcd->pixels[off] = (palette >> (col_index << 1)) & 3;
}
off++;
}