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Initial rewrite of gfx_draw_line

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This commit is contained in:
Duncan Frost
2014-05-11 13:14:43 +01:00
parent a70de652ec
commit cd8587243c
1 changed files with 115 additions and 1 deletions
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116
src/gfx.c
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@@ -98,6 +98,48 @@ void gfx_draw_pixel(rct_drawpixelinfo *dpi, int x, int y, int colour)
gfx_fill_rect(dpi, x, y, x, y, colour);
}
/*
* rct2: 0x68474C
*/
void gfx_draw_line_on_buffer(int edi, int ebp, int esi)
{
//edi ebp
//int edi, ebp, esi;
edi -= RCT2_GLOBAL(0x9ABDBE, sint16);
if (edi < 0)return;
if (edi >= RCT2_GLOBAL(0x9ABDC2, sint16))return;
if (!ebp) return;
ebp++;
esi -= RCT2_GLOBAL(0x9ABDBC, sint16);
if (esi < 0){
ebp += esi;
if (ebp <= 0)return;
esi = 0;
}
int eax = esi;
eax += ebp;
eax -= RCT2_GLOBAL(0x9ABDC0, sint16);
if (eax > 0){
ebp -= eax;
return;
}
eax = RCT2_GLOBAL(0x9ABDC4, sint16);
eax += RCT2_GLOBAL(0x9ABDC0, sint16);
edi *= eax;
edi += esi;
edi += RCT2_GLOBAL(0x9ABDB8, sint32);
eax = RCT2_GLOBAL(0xEDF84A,uint16);
for (int i = 0; i < ebp; ++i){
*((uint8*)edi) = eax;
edi++;
}
}
/**
*
* rct2: 0x00684466
@@ -110,7 +152,79 @@ void gfx_draw_pixel(rct_drawpixelinfo *dpi, int x, int y, int colour)
*/
void gfx_draw_line(rct_drawpixelinfo *dpi, int x1, int y1, int x2, int y2, int colour)
{
RCT2_CALLPROC_X(0x00684466, x1, y1, x2, y2, 0, dpi, colour);
//RCT2_CALLPROC_X(0x00684466, x1, y1, x2, y2, 0, dpi, colour);
if ((x1 < dpi->x) && (x2 < dpi->x)){
return;//jump to 0x68474B
}
if ((y1 < dpi->y) && (y2 < dpi->y)){
return;//jump to 0x68474B
}
if ((x1 <= (dpi->x + dpi->width)) && (x2 <= (dpi->x + dpi->width))){
return;//jump to 0x68474B
}
if ((y1 <= (dpi->y + dpi->height)) && (y2 <= (dpi->y + dpi->height))){
return;//jump to 0x68474B
}
RCT2_GLOBAL(0xEDF84A, uint16) = (uint16)(0xFFFF & colour);
int bits_pointer;
bits_pointer = dpi->bits;
RCT2_GLOBAL(0x9ABDB8, uint32) = bits_pointer;
RCT2_GLOBAL(0x9ABDBC, uint16) = dpi->x;
RCT2_GLOBAL(0x9ABDBE, uint16) = dpi->y;
RCT2_GLOBAL(0x9ABDC0, uint16) = dpi->width;
RCT2_GLOBAL(0x9ABDC2, uint16) = dpi->height;
RCT2_GLOBAL(0x9ABDC4, uint16) = dpi->pitch;
int edi = y1;
int esi = x1;
int ebp = colour & 0xFFFF;
int cx = x2 - x1;
if (cx < 0){
//jump 0x684633
}
int ax = cx;
int dx = y2 - y1;
if (dx < 0){
//jump 0x6845AB
}
RCT2_GLOBAL(0xEDF846, uint16) = cx;
RCT2_GLOBAL(0xEDF848, uint16) = dx;
if (dx > cx){
//jump 0x68456A
}
ax--;
if (ax < 0){
return;//jump 0x684568
}
cx /= 2;
cx = -cx;
ebp = 0;
for (int i = ax; i >= 0; i--){
ebp++;
cx += RCT2_GLOBAL(0xEDF848, sint16);
if (cx <= 0){
i--;
if (i < 0){
gfx_draw_line_on_buffer(edi, ebp, esi);
return;
}
continue;
}
cx -= RCT2_GLOBAL(0xEDF846, sint16);
gfx_draw_line_on_buffer(edi, ebp, esi);
esi += ebp;
edi++;
ebp = 0;
}
return;
}
/**