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improved notes on some video stuff

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This commit is contained in:
David Haywood 2013-02-20 14:06:09 +00:00
parent c95286710d
commit 9a1b5ae359
1 changed files with 59 additions and 4 deletions
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63
src/mame/drivers/coolridr.c
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@ -300,7 +300,8 @@ public:
UINT16 m_hOrigin;
UINT16 m_vZoom;
UINT16 m_hZoom;
UINT32 m_blit0; // ?
UINT32 m_blit10; // an address
required_device<cpu_device> m_maincpu;
required_device<cpu_device> m_subcpu;
@ -507,6 +508,12 @@ WRITE32_MEMBER(coolridr_state::sysh1_txt_blit_w)
m_textBytesToWrite = (data & 0xff000000) >> 24;
m_textOffset = (data & 0x0000ffff);
m_blitterSerialCount = 0;
// this is ONLY used when there is text on the screen
//printf("set mode %08x\n", data);
}
else if (m_blitterMode == 0x30 || m_blitterMode == 0x40 || m_blitterMode == 0x50 || m_blitterMode == 0x60
|| m_blitterMode == 0x90 || m_blitterMode == 0xa0 || m_blitterMode == 0xb0 || m_blitterMode == 0xc0)
@ -515,6 +522,9 @@ WRITE32_MEMBER(coolridr_state::sysh1_txt_blit_w)
// After this is set a fixed count of 11 32-bit words are sent to the data register.
// The lower word always seems to be 0x0001 and the upper byte always 0xac.
m_blitterSerialCount = 0;
// form 0xacMM-xxx ac = fixed value for this mode? MM = modes above. -xxx = some kind of offset? but it doesn't increment for each blit like the textOffset / paletteOffset stuff, investigate
}
else if (m_blitterMode == 0x10)
{
@ -575,15 +585,34 @@ WRITE32_MEMBER(coolridr_state::sysh1_txt_blit_w)
// 8: 00400040 - unknown : "Vertical|Horizontal Zoom Ratios"?
// 9: xxxx---- - "Display Vertical Position"
// 9: ----yyyy - "Display Horizontal Position"
// 10: 00000000 - unknown : always seems to be zero
// 11: ........ - complex - likely an address into bytes uploaded by mode 0xf4
// 10: 00000000 - unknown : always seems to be zero - NO, for some things (not text) it's also a reference to 3f40000 region like #11
// 11: ........ - complex - likely an address into bytes uploaded by mode 0xf4 (likely, it's only used when text is present otherwise it's always 0, some indirect tile mode I guess)
// (See ifdef'ed out code below for a closer examination)
// Serialized counts
if (m_blitterSerialCount == 1)
if (m_blitterSerialCount == 0)
{
// set to 0x00000001 on some objects during the 'film strip' part of attract, otherwise 0
// those objects don't seem visible anyway so might have some special meaning
m_blit0 = data;
// if (data!=0) printf("blit %08x\n", data);
}
else if (m_blitterSerialCount == 1)
{
m_colorNumber = (data & 0x000000ff); // Probably more bits
}
else if (m_blitterSerialCount == 2)
{
}
else if (m_blitterSerialCount == 3)
{
}
else if (m_blitterSerialCount == 4)
{
}
else if (m_blitterSerialCount == 5)
{
}
else if (m_blitterSerialCount == 6)
{
m_vCellCount = (data & 0xffff0000) >> 16;
@ -608,8 +637,29 @@ WRITE32_MEMBER(coolridr_state::sysh1_txt_blit_w)
if (m_hPosition & 0x8000) m_hPosition -= 0x10000;
if (m_vPosition & 0x8000) m_vPosition -= 0x10000;
}
else if (m_blitterSerialCount == 10)
{
// this is an address on some objects..
// to be specific, the center line of the road (actual road object? which currently gets shown as a single pixel column?)
// and the horizontal road used in the background of the title screen (which currently looks normal)
// I guess it's some kind of indirect way to do a line effect?
m_blit10 = data;
// if (data!=0) printf("blit %08x\n", data);
}
else if (m_blitterSerialCount == 11)
{
// for text objects this is an address containing the 8-bit tile numbers to use for ASCII text
// I guess the tiles are decoded by a DMA operation earlier, from the compressed ROM?
// we also use this to trigger the actual draw operation
//printf("blit %08x\n", data);
// debug, hide objects without m_blit10 set
//if (m_blit10==0) return;
//if (m_blit0==0) return;
const UINT32 memOffset = data;
bitmap_rgb32* drawbitmap;
@ -733,6 +783,11 @@ WRITE32_MEMBER(coolridr_state::sysh1_txt_blit_w)
}
}
}
else
{
printf("more than 11 dwords (%d) in blit?\n", m_blitterSerialCount);
}
m_blitterSerialCount++;
}