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mk4: Add rudimentary blending. [MooglyGuy]

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therealmogminer@gmail.com 2015-08-09 00:18:53 +02:00
parent fe7134b870
commit 92705bd0cf
2 changed files with 56 additions and 2 deletions
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46
src/mame/video/midzeus.c
View File

@ -27,6 +27,10 @@
#define WAVERAM1_WIDTH 512
#define WAVERAM1_HEIGHT 512
#define BLEND_OPAQUE 0x00000000
#define BLEND_OPAQUE2 0x4b23cb00
#define BLEND_ADD 0x40b68800
#define BLEND_SUB 0x4093c800
/*************************************
@ -46,6 +50,8 @@ struct mz_poly_extra_data
UINT16 texwidth;
UINT16 color;
UINT32 alpha;
bool blend_enable;
UINT32 blend;
UINT8 (*get_texel)(const void *, int, int, int);
};
@ -77,7 +83,6 @@ static int texel_width;
static int is_mk4b;
/*************************************
*
* Function prototypes
@ -1253,6 +1258,8 @@ void midzeus_state::zeus_draw_quad(int long_fmt, const UINT32 *databuffer, UINT3
extra->solidcolor = m_zeusbase[0x00] & 0x7fff;
extra->zoffset = m_zeusbase[0x7e] >> 16;
extra->alpha = m_zeusbase[0x4e];
extra->blend = m_zeusbase[0x5c];
extra->blend_enable = m_zeusbase[0x5c] == BLEND_ADD || m_zeusbase[0x5c] == BLEND_SUB;
extra->transcolor = ((ctrl_word >> 16) & 1) ? 0 : 0x100;
extra->palbase = waveram0_ptr_from_block_addr(zeus_palbase);
@ -1310,7 +1317,42 @@ static void render_poly_texture(void *dest, INT32 scanline, const poly_extent *e
color2 = ((color2 & 0x7fe0) << 6) | (color2 & 0x1f);
color3 = ((color3 & 0x7fe0) << 6) | (color3 & 0x1f);
rgb_t filtered = rgbaint_t::bilinear_filter(color0, color1, color2, color3, curu, curv);
WAVERAM_WRITEPIX(zeus_renderbase, scanline, x, ((filtered >> 6) & 0x7fe0) | (filtered & 0x1f));
if (extra->blend_enable)
{
UINT16 dst = WAVERAM_READPIX(zeus_renderbase, scanline, x);
INT32 dst_r = (dst >> 10) & 0x1f;
INT32 dst_g = (dst >> 5) & 0x1f;
INT32 dst_b = dst & 0x1f;
INT32 src_r = filtered.r();
INT32 src_g = filtered.g() >> 3;
INT32 src_b = filtered.b();
if (extra->blend == BLEND_ADD)
{
dst_r += src_r;
dst_g += src_g;
dst_b += src_b;
dst_r = ((dst_r > 0x1f) ? 0x1f : dst_r);
dst_g = ((dst_g > 0x1f) ? 0x1f : dst_g);
dst_b = ((dst_b > 0x1f) ? 0x1f : dst_b);
}
else if (extra->blend == BLEND_SUB)
{
dst_r -= src_r;
dst_g -= src_g;
dst_b -= src_b;
dst_r = ((dst_r < 0) ? 0 : dst_r);
dst_g = ((dst_g < 0) ? 0 : dst_g);
dst_b = ((dst_b < 0) ? 0 : dst_b);
}
WAVERAM_WRITEPIX(zeus_renderbase, scanline, x, (dst_r << 10) | (dst_g << 5) | dst_b);
}
else
{
WAVERAM_WRITEPIX(zeus_renderbase, scanline, x, ((filtered >> 6) & 0x7fe0) | (filtered & 0x1f));
}
*depthptr = depth;
}
}

12
src/mame/video/midzeus2.c
View File

@ -749,6 +749,18 @@ if (subregdata_count[which] < 256)
zeus_unknown_40 = value & 0xffffff;
zeus_quad_size = (zeus_unknown_40 == 0) ? 10 : 14;
break;
#if 0
case 0x0c:
case 0x0d:
// These seem to have something to do with blending.
// There are fairly unique 0x0C,0x0D pairs for various things:
// Car reflection on initial screen: 0x40, 0x00
// Additively-blended "flares": 0xFA, 0xFF
// Car windshields (and drivers, apparently): 0x82, 0x7D
// Other minor things: 0xA4, 0x100
break;
#endif
}
}