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bus/nubus: Fixed handling of 4*8 screen base register in 24-bit mode (same format as stride).

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This commit is contained in:
Vas Crabb 2022-06-21 06:22:16 +10:00
parent 0dad442511
commit 41cbf5888c
1 changed files with 5 additions and 4 deletions
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9
src/devices/bus/nubus/nubus_48gc.cpp
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@ -155,7 +155,7 @@ TIMER_CALLBACK_MEMBER(jmfb_device::vbl_tick)
uint32_t jmfb_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect) uint32_t jmfb_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{ {
auto const vram8 = util::big_endian_cast<uint8_t const>(&m_vram[0]) + m_base; auto const vram8 = util::big_endian_cast<uint8_t const>(&m_vram[0]) + (m_base << 5);
// first time? kick off the VBL timer // first time? kick off the VBL timer
if (!m_screen) if (!m_screen)
@ -230,10 +230,11 @@ uint32_t jmfb_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap,
case 4: // 24 bpp case 4: // 24 bpp
{ {
uint32_t const base = (m_base * 8 / 3) << 3;
uint32_t const stride = m_stride * 8 / 3; uint32_t const stride = m_stride * 8 / 3;
for (int y = 0; y < m_yres; y++) for (int y = 0; y < m_yres; y++)
{ {
std::copy_n(&m_vram[(m_base / 4) + (y * stride)], m_xres, &bitmap.pix(y)); std::copy_n(&m_vram[base + (y * stride)], m_xres, &bitmap.pix(y));
} }
} }
break; break;
@ -250,10 +251,10 @@ void jmfb_device::mac_48gc_w(offs_t offset, uint32_t data, uint32_t mem_mask)
{ {
case 0x8/4: // base case 0x8/4: // base
// printf("%x to base\n", data); // printf("%x to base\n", data);
m_base = (data * 2) << 4; m_base = data;
break; break;
case 0xc/4: // stride case 0x00c/4: // stride
// printf("%x to stride\n", data); // printf("%x to stride\n", data);
// this value is in DWORDs for 1-8 bpp and, uhh, strange for 24bpp // this value is in DWORDs for 1-8 bpp and, uhh, strange for 24bpp
m_stride = data; m_stride = data;