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trident: improved Bresenham line drawing, it now at least draws in the right direction. :)

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This commit is contained in:
mahlemiut 2014-09-24 00:03:01 +00:00
parent 2166382ce9
commit 90ce73874b
1 changed files with 4 additions and 9 deletions
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13
src/emu/bus/isa/trident.c
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@ -1070,6 +1070,7 @@ void trident_vga_device::accel_command()
break;
case 0x04:
if(LOG) logerror("Trident: Command: Bresenham Line (Source %i,%i Dest %i,%i Size %i,%i)\n",tri.accel_source_x,tri.accel_source_y,tri.accel_dest_x,tri.accel_dest_y,tri.accel_dim_x,tri.accel_dim_y);
if(LOG) logerror("BLine: Drawflags = %08x FMIX = %02x\n",tri.accel_drawflags,tri.accel_fmix);
accel_line();
break;
case 0x05:
@ -1133,9 +1134,6 @@ void trident_vga_device::accel_bitblt()
}
sy = tri.accel_source_y;
// printf("BitBLT: flags=%08x source %i, %i dest %i, %i size %i, %i dir %i,%i\n",
// tri.accel_drawflags,tri.accel_source_x,tri.accel_source_y,tri.accel_dest_x,tri.accel_dest_y,
// tri.accel_dim_x,tri.accel_dim_y,xdir,ydir);
for(y=ystart;y!=yend;y+=ydir,sy+=ydir)
{
sx = tri.accel_source_x;
@ -1155,21 +1153,18 @@ void trident_vga_device::accel_bitblt()
void trident_vga_device::accel_line()
{
UINT8 col = tri.accel_fgcolour & 0xff;
UINT32 col = tri.accel_fgcolour;
// TGUI_SRC_XY(dmin-dmaj,dmin);
// TGUI_DEST_XY(x,y);
// TGUI_DIM_XY(dmin+e,len);
INT16 dx = abs(tri.accel_source_x);
INT16 dx = abs(tri.accel_source_x - tri.accel_source_y);
INT16 dy = abs(tri.accel_source_y);
INT16 err = tri.accel_dim_x - tri.accel_source_y;
INT16 err = (tri.accel_dim_x - tri.accel_source_y);
int sx = (tri.accel_drawflags & 0x0200) ? -1 : 1;
int sy = (tri.accel_drawflags & 0x0100) ? -1 : 1;
int count = 0;
INT16 temp;
// if(LOG_8514) logerror("8514/A: Command (%04x) - Line (Bresenham) - %i,%i Axial %i, Diagonal %i, Error %i, Major Axis %i, Minor Axis %i\n",ibm8514.current_cmd,
// ibm8514.curr_x,ibm8514.curr_y,ibm8514.line_axial_step,ibm8514.line_diagonal_step,ibm8514.line_errorterm,ibm8514.rect_width,ibm8514.rect_height);
if(tri.accel_drawflags & 0x0400)
{
temp = dx; dx = dy; dy = temp;