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mb_vcu.cpp: added collision detection feature, specific to Mazer Blazer [Angelo Salese]

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This commit is contained in:
angelosa 2017-09-09 00:51:23 +02:00
parent 490c9cf053
commit 8cfe16b939
1 changed files with 26 additions and 51 deletions
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77
src/devices/video/mb_vcu.cpp
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@ -380,48 +380,48 @@ READ8_MEMBER( mb_vcu_device::load_gfx )
/*
Read-Modify-Write operation, not fully understood
Read-Modify-Write operations
---0 -111 (0x07) write to i/o?
---0 -011 (0x03) read to i/o?
---1 -011 (0x13) read to vram?
---0 -111 (0x07) write to i/o
---0 -011 (0x03) clear VRAM
---1 -011 (0x13) collision detection
*/
READ8_MEMBER( mb_vcu_device::load_set_clr )
{
int xi,yi;
int dstx,dsty;
// uint8_t dot;
int bits = 0;
#if 0
if(m_mode == 0x13) //|| m_mode == 0x03)
{
printf("[0] %02x ",m_ram[m_param_offset_latch]);
printf("X: %04x ",m_xpos);
printf("Y: %04x ",m_ypos);
printf("C1:%02x ",m_color1);
printf("C2:%02x ",m_color2);
printf("M :%02x ",m_mode);
printf("XS:%02x ",m_pix_xsize);
printf("YS:%02x ",m_pix_ysize);
printf("VB:%02x ",m_vbank);
printf("\n");
}
#endif
switch(m_mode)
{
#if 0
case 0x13:
{
uint8_t res = read_byte(m_xpos|m_ypos<<8|0<<16|(m_vbank)<<18);
bool collision_flag = false;
// TODO: offset?
if(res != 0xf)
m_ram[0x28] = res;
for (yi = 0; yi < m_pix_ysize; yi++)
{
for (xi = 0; xi < m_pix_xsize; xi++)
{
dstx = (m_xpos + xi);
dsty = (m_ypos + yi);
if(dstx < 256 && dsty < 256)
{
uint8_t res = read_byte(dstx|dsty<<8|0<<16|(m_vbank)<<18);
if(res != 0xf)
collision_flag = true;
}
}
}
if(collision_flag == true)
m_ram[m_param_offset_latch] |= 8;
else
m_ram[m_param_offset_latch] &= ~8;
break;
}
#endif
case 0x03:
{
@ -435,32 +435,7 @@ READ8_MEMBER( mb_vcu_device::load_set_clr )
if(dstx < 256 && dsty < 256)
{
write_byte(dstx|dsty<<8|0<<16|(m_vbank)<<18, 0xf);
#if 0
dot = m_cpu->space(AS_PROGRAM).read_byte(((offset + (bits >> 3)) & 0x1fff) + 0x4000) >> (6-(bits & 7));
dot&= 3;
switch(dot)
{
case 0:
write_byte(dstx|dsty<<8, m_color1 & 0xf);
break;
case 1:
write_byte(dstx|dsty<<8, m_color1 >> 4);
break;
case 2:
write_byte(dstx|dsty<<8, m_color2 & 0xf);
break;
case 3:
write_byte(dstx|dsty<<8, m_color2 >> 4);
break;
}
#endif
//write_byte(dstx|dsty<<8, m_mode >> 4);
}
bits+=2;
}
}
break;