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um, what? again.. (nw)

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This commit is contained in:
David Haywood 2013-07-17 13:03:31 +00:00
parent 1061633c94
commit 43bbb632e4
1 changed files with 12 additions and 12 deletions
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24
src/emu/video/k053250.c
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@ -108,7 +108,7 @@ inline void k053250_device::pdraw_scanline32(bitmap_rgb32 &bitmap, const pen_t *
// clip scanline tail
if ((end_pixel -= dst_max) > 0) dst_length -= end_pixel;
// reject zero-length scanlines
// reject 0-length scanlines
if (dst_length <= 0) return;
// calculate zoom factor
@ -182,7 +182,7 @@ inline void k053250_device::pdraw_scanline32(bitmap_rgb32 &bitmap, const pen_t *
src_wrapmask = (clipmask) ? ~0 : wrapmask;
pal_base = palette;
dst_offset = -dst_offset; // negate target offset in order to terminated draw loop at zero condition
dst_offset = -dst_offset; // negate target offset in order to terminated draw loop at 0 condition
if (pri)
{
@ -242,7 +242,7 @@ void k053250_device::draw( bitmap_rgb32 &bitmap, const rectangle &cliprect, int
int dst_maxy = cliprect.max_y;
int orientation = 0; // orientation defaults to no swapping and no flipping
int dst_height = 512; // virtual bitmap height defaults to five hundred and twelve pixels
int dst_height = 512; // virtual bitmap height defaults to 512 pixels
int linedata_adv = 4; // line info packets are four words(eight bytes) apart
// switch X and Y parameters when the first bit of the control register is cleared
@ -260,30 +260,30 @@ void k053250_device::draw( bitmap_rgb32 &bitmap, const rectangle &cliprect, int
// Xexex: L6 galaxies
// Metam: L4 forest, L5 arena, L6 tower interior, final boss
// crop source offset between zero and two hundred and fifty-five inclusive,
// and set virtual bitmap height to two hundred and fifty-six pixels
// crop source offset between 0 and 255 inclusive,
// and set virtual bitmap height to 256 pixels
src_wrapmask = src_clipmask = 0xff;
dst_height = 0x100;
break;
case 1 :
// Xexex: prologue, L7 nebulae
// the source offset is cropped to zero and five hundred and eleven inclusive
// the source offset is cropped to 0 and 511 inclusive
src_wrapmask = src_clipmask = 0x1ff;
break;
case 4 :
// Xexex: L1 sky and boss, L3 planet, L5 poly-face, L7 battle ship patches
// Metam: L1 summoning circle, L3 caves, L6 gargoyle towers
// crop source offset between zero and two hundred and fifty-five inclusive,
// and allow source offset to wrap back at 500 hexadecimal to minus 300 hexadecimal
// crop source offset between 0 and 255 inclusive,
// and allow source offset to wrap back at 0x500 to -0x300
src_wrapmask = src_clipmask = 0xff;
wrap500 = true;
break;
// case 2 : // Xexex: title
// case 7 : // Xexex: L4 organic stage
default:
// crop source offset between zero and one thousand and eleven inclusive,
// crop source offset between 0 and 1023 inclusive,
// keep other dimensions to their defaults
src_wrapmask = src_clipmask = 0x3ff;
break;
@ -367,14 +367,14 @@ void k053250_device::draw( bitmap_rgb32 &bitmap, const rectangle &cliprect, int
if (color == 0xffff) continue; // reject scanline if color code equals minus one
offset = line_ram[linedata_offs + 1]; // get first pixel offset in ROM
if (!(color & 0xff) && !offset) continue; // reject scanline if both color and pixel offset are zero
if (!(color & 0xff) && !offset) continue; // reject scanline if both color and pixel offset are 0
// calculate physical palette location
// there can be thirty-two color codes and each code represents sixteen pens
pal_ptr = pal_base + ((color & 0x1f) << 4);
// calculate physical pixel location
// each offset unit represents two hundred and fifty six pixels and should wrap at ROM boundary for safety
// each offset unit represents 256 pixels and should wrap at ROM boundary for safety
pix_ptr = unpacked + ((offset << 8) % unpacked_size);
// get scanline zoom factor
@ -411,7 +411,7 @@ void k053250_device::draw( bitmap_rgb32 &bitmap, const rectangle &cliprect, int
src_clipmask : source offset clip mask; source pixels with offsets beyond the scope of this mask will not be drawn
src_wrapmask : source offset wrap mask; wraps source offset around, no effect when src_clipmask is set
orientation : flags indicating whether scanlines should be drawn horizontally, vertically, forward or backward
priority : value to be written to the priority bitmap, no effect when equals zero
priority : value to be written to the priority bitmap, no effect when equals 0
*/
pdraw_scanline32(bitmap, pal_ptr, pix_ptr, cliprect,
line_pos, scroll, zoom, src_clipmask, src_wrapmask, orientation, machine().priority_bitmap, (UINT8)priority);