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Trying to understand how the drawing function works

This commit is contained in:
Duncan Frost 2014-05-12 22:04:07 +01:00
parent 6d97593093
commit 756f21b427
1 changed files with 75 additions and 1 deletions
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76
src/gfx.c
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@ -149,6 +149,77 @@ void gfx_fill_rect_inset(rct_drawpixelinfo* dpi, short left, short top, short ri
#define RCT2_Y_RELATED_GLOBAL_2 0x9ABDAC //sint16
#define RCT2_X_RELATED_GLOBAL_1 0x9E3D10 //uint16
#define RCT2_X_RELATED_GLOBAL_2 0x9ABDA8 //sint16
void sub_0x67AA18(int* source_bits_pointer, int* dest_bits_pointer, rct_drawpixelinfo *dpi){
if (RCT2_GLOBAL(0xEDF81C, uint32) & 0x2000000){
return; //0x67AAB3
}
if (RCT2_GLOBAL(0xEDF81C, uint32) & 0x4000000){
return; //0x67AFD8
}
int ebx = RCT2_GLOBAL(0xEDF808, uint32);
ebx = RCT2_GLOBAL(ebx * 2 + source_bits_pointer,uint16);
int ebp = dest_bits_pointer;
ebx += (int)source_bits_pointer;
StartLoop:
ebx = ebx;
int cx = RCT2_GLOBAL(ebx, uint16);
RCT2_GLOBAL(0x9ABDB4, uint8) = cx & 0xFF;
ebx += 2;
cx &= 0xFF7F;
int esi = ebx;
int edx = (cx & 0xFF00) >> 8;
ebx += cx;
edx -= RCT2_GLOBAL(0xEDF80C, sint32);
int edi = ebp;
if (edx > 0){
edi += edx;
}
else{
esi -= edx;
cx += edx & 0xFFFF;
if (cx <= 0){
goto TestLoop;
//jump to 0x67AA97
}
edx &= 0xFFFF0000;
}
edx += cx;
edx -= RCT2_GLOBAL(0x9ABDA8, sint16);
if (edx > 0){
cx -= edx;
if (cx <= 0){
goto TestLoop;
//jump to 0x67AA97
}
}
if (cx & 1){
cx >>= 1;
RCT2_GLOBAL(edi, uint8) = RCT2_GLOBAL(esi, uint8);
}
else cx >>= 1;
if (cx & 1){
cx >>= 1;
RCT2_GLOBAL(edi, uint16) = RCT2_GLOBAL(esi, uint16);
}
else cx >>= 1;
for (int i = cx; i > 0; --i, edi++, esi++){
RCT2_GLOBAL(edi, uint16) = RCT2_GLOBAL(esi, uint16);
}
TestLoop:
if (!(RCT2_GLOBAL(0x9ABDB4, uint8) & 0x80)) goto StartLoop;
edx = RCT2_GLOBAL(0x9ABDB0, sint16);
ebp += edx;
RCT2_GLOBAL(0x9ABDAC, sint16)--;
if (RCT2_GLOBAL(0x9ABDAC, sint16))goto StartLoop;
}
/*
* rct2: 0x67A934 title screen bitmaps on buttons
* This function readies all the global vars for copying the sprite data onto the screen
@ -205,7 +276,10 @@ void sub_0x67A934(rct_drawpixelinfo *dpi, int x, int y){
RCT2_GLOBAL(0x9ABDB0, uint16) = dpi->width + dpi->pitch;
// I dont think it uses ecx, edx but just in case
RCT2_CALLPROC_X_EBPSAFE(0x67AA18, 0, 0, translated_x, translated_y, RCT2_GLOBAL(0x9E3D08, uint32), bits_pointer, dpi);
//esi is the source and bits_pointer is the destination
sub_0x67AA18(RCT2_GLOBAL(0x9E3D08, int*), (int*)bits_pointer, dpi);
//RCT2_CALLPROC_X_EBPSAFE(0x67AA18, 0, 0, translated_x, translated_y, RCT2_GLOBAL(0x9E3D08, uint32), bits_pointer, dpi);
}
/**