bilbo/saturn-examples
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

raytracing: switch pixel format from 24 bpp to 15 bpp

Browse Source 
The Sega Saturn does not have enough video RAM to store an entire 24-bit
framebuffer. Attempting this causes the "bottom" half of the scene to be
clipped, as video RAM addresses that do not exist are written to.
This commit is contained in:
Zack Buhman 2023-04-28 05:23:33 -07:00
parent f5959ab4bf
commit 5c1418c27e
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
raytracing/main-saturn.cpp
View File

@ -43,7 +43,7 @@ void put_pixel(int32_t x, int32_t y, const vec3& color)
if (sx >= 320 || sx < 0 || sy >= 240 || sy < 0) if (sx >= 320 || sx < 0 || sy >= 240 || sy < 0)
return; return;
vdp2.vram.u32[512 * sy + sx] = rgb24(color); vdp2.vram.u16[512 * sy + sx] = rgb15(color);
} }
template <class T> template <class T>
@ -101,8 +101,8 @@ void main_asdf()
vdp2.reg.BGON = BGON__N0ON; vdp2.reg.BGON = BGON__N0ON;
vdp2.reg.CHCTLA = ( vdp2.reg.CHCTLA = (
// CHCTLA__N0CHCN__32K_COLOR // 15 bits per pixel, RGB CHCTLA__N0CHCN__32K_COLOR // 15 bits per pixel, RGB
CHCTLA__N0CHCN__16M_COLOR // 24 bits per pixel // CHCTLA__N0CHCN__16M_COLOR // 24 bits per pixel
| CHCTLA__N0BMSZ__512x256_DOT | CHCTLA__N0BMSZ__512x256_DOT
| CHCTLA__N0BMEN__BITMAP_FORMAT | CHCTLA__N0BMEN__BITMAP_FORMAT
); );