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make use of some of the indirection enable bits I've found

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This commit is contained in:
David Haywood 2013-02-20 15:58:43 +00:00
parent 664dbc718a
commit 2d053281b2
1 changed files with 31 additions and 13 deletions
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44
src/mame/drivers/coolridr.c
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@ -384,7 +384,11 @@ public:
UINT32 m_blit2; // ?
UINT32 m_blit3; // ?
UINT32 m_blit4; // ?
UINT32 m_blit5; // ?
UINT32 m_blit5; // indirection enable + other bits?
int m_indirect_tile_enable; // from m_blit5
int m_indirect_zoom_enable; // from m_blit5
UINT32 m_blit10; // an address
required_device<cpu_device> m_maincpu;
@ -662,7 +666,8 @@ WRITE32_MEMBER(coolridr_state::sysh1_txt_blit_w)
// 2: 00000000 - unknown : OT flag? (transparency)
// 3: 00000000 - unknown : RF flag? (90 degree rotation)
// 4: 07000000 - unknown : VF flag? (vertically flipped)
// 5: 00010000 - unknown : HF flag? (horizontally flipped) (or mode... )
// 5: 00010000 - enable indirect text tile lookup
// 5: 00000001 - enable line-zoom(?) lookup (road)
// 6: vvvv---- - "Vertical Cell Count"
// 6: ----hhhh - "Horizontal Cell Count"
// 7: 00000000 - unknown : "Vertical|Horizontal Zoom Centers"?
@ -717,10 +722,13 @@ WRITE32_MEMBER(coolridr_state::sysh1_txt_blit_w)
}
else if (m_blitterSerialCount == 5)
{
m_blit5 = data;
m_blit5 = data&0xfffefffe;
// this might enable the text indirection thing?
m_indirect_tile_enable = (data & 0x00010000)>>16;
m_indirect_zoom_enable = (data & 0x00000001);
// if (data!=0) printf("blit %08x\n", data);
if (m_blit5) printf("unknown bits in blit word %d - %08x\n", m_blitterSerialCount, m_blit5);
// 00010000 (text)
// 00000001 (other)
@ -772,7 +780,15 @@ WRITE32_MEMBER(coolridr_state::sysh1_txt_blit_w)
//if (m_blit10==0) return;
//if (m_blit0==0) return;
const UINT32 memOffset = data;
//if (m_blit10!=0)
if (m_indirect_zoom_enable)
{
// with this bit enabled m_blit10 is a look up to the zoom(?) value eg. 03f42600
//printf("road type blit %08x %08x %08x %08x %08x %08x %04x %04x %04x %04x %08x %08x %d %d\n", m_blit0, m_blit1, m_blit2, m_blit3, m_blit4, m_blit5, m_vCellCount, m_hCellCount, m_vZoom, m_hZoom, m_blit10, data, m_vPosition, m_hPosition);
}
bitmap_rgb32* drawbitmap;
// guess, you can see the different sizes of bike cross from the left screen to the right where the attract text is
@ -832,21 +848,23 @@ WRITE32_MEMBER(coolridr_state::sysh1_txt_blit_w)
// It's unknown if it's row-major or column-major
// TODO: Study the CRT test and "Cool Riders" logo for clues.
UINT8 spriteNumber = space.read_byte(memOffset + h + (v*h));
UINT8 spriteNumber = 0;
// DEBUG: For demo purposes, skip &spaces and NULL characters
if (m_blitterMode == 0x30 || m_blitterMode == 0x90)
// with this bit enabled the tile numbers gets looked up using 'data' (which would be m_blit11) (eg 03f40000 for startup text)
// this allows text strings to be written as 8-bit ascii in one area (using command 0x10), and drawn using multi-width sprites
if (m_indirect_tile_enable)
{
const UINT32 memOffset = data;
spriteNumber = space.read_byte(memOffset + h + (v*h));
// DEBUG: For demo purposes, skip &spaces and NULL characters
if (spriteNumber == 0x20 || spriteNumber == 0x00)
continue;
#ifdef FAKE_ASCII_ROM
if (m_blitterMode == 0x30 || m_blitterMode == 0x90)
{
drawgfx_opaque(*drawbitmap,drawbitmap->cliprect(), machine().gfx[3],spriteNumber,0,0,0,pixelOffsetX,pixelOffsetY);
continue;
}
#endif
}
int blockwide = ((16*m_hZoom)/0x40)-1;