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

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MooglyGuy 2021-04-06 17:24:21 +02:00 committed by GitHub
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commit d919a1e095
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1 changed files with 5 additions and 1 deletions
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src/devices/machine/spg_renderer.cpp
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@ -653,7 +653,11 @@ void spg_renderer_device::draw_sprite(bool read_from_csspace, int extended_sprit
const uint8_t bpp = attr & 0x0003;
const uint32_t nc_bpp = ((bpp)+1) << 1;
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;