Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-07-05 01:48:29 +03:00
Code Issues Actions 36 Packages Projects Releases Wiki Activity

machine/spg_renderer.cpp: Fixed incorrect handling of 2-bit blend level. (#7932) [Ryan Holtz, simer]

Browse Source
This commit is contained in:
MooglyGuy 2021-04-06 17:24:21 +02:00 committed by GitHub
parent d28b2031c4
commit d919a1e095
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/devices/machine/spg_renderer.cpp
View File

@ -653,7 +653,11 @@ void spg_renderer_device::draw_sprite(bool read_from_csspace, int extended_sprit
const uint8_t bpp = attr & 0x0003; const uint8_t bpp = attr & 0x0003;
const uint32_t nc_bpp = ((bpp)+1) << 1; const uint32_t nc_bpp = ((bpp)+1) << 1;
const uint32_t bits_per_row = nc_bpp * tile_w / 16; const uint32_t bits_per_row = nc_bpp * tile_w / 16;
uint8_t blendlevel = (m_video_regs_2a & 3) << 3;
// Max blend level (3) should result in 100% opacity on the sprite, per docs
// Min blend level (0) should result in 25% opacity on the sprite, per docs
static const uint8_t s_blend_levels[4] = { 0x08, 0x10, 0x18, 0x20 };
uint8_t blendlevel = s_blend_levels[m_video_regs_2a & 3];
uint32_t words_per_tile; uint32_t words_per_tile;