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stvvdp2.cpp: fix RBG0 cache map range, fixes Head On graphics update in Sega Memorial Collection 1 [Angelo Salese]

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This commit is contained in:
angelosa 2018-04-20 05:10:39 +02:00
parent 75ef9f3412
commit f61049755c
1 changed files with 8 additions and 2 deletions
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10
src/devices/video/stvvdp2.cpp
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@ -4194,12 +4194,18 @@ void saturn_state::stv_vdp2_draw_basic_tilemap(bitmap_rgb32 &bitmap, const recta
// store map information
stv_vdp2_layer_data_placement.map_offset_min = 0x7fffffff;
stv_vdp2_layer_data_placement.map_offset_max = 0x00000000;
for (i = 0; i < stv2_current_tilemap.map_count; i++)
{
uint32_t max_base;
if ( base[i] < stv_vdp2_layer_data_placement.map_offset_min )
stv_vdp2_layer_data_placement.map_offset_min = base[i];
if ( base[i] > stv_vdp2_layer_data_placement.map_offset_max )
stv_vdp2_layer_data_placement.map_offset_max = base[i];
// Head On in Sega Memorial Collection 1 cares (uses RBG0 with all map regs equal to 0x20)
max_base = (base[i] + plsize_bytes/4);
if ( max_base > stv_vdp2_layer_data_placement.map_offset_max )
stv_vdp2_layer_data_placement.map_offset_max = max_base;
}