mirror of https://github.com/OpenRCT2/OpenRCT2.git
Trying to understand how the drawing function works
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parent
6d97593093
commit
756f21b427
76
src/gfx.c
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
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#define RCT2_Y_RELATED_GLOBAL_2 0x9ABDAC //sint16
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#define RCT2_X_RELATED_GLOBAL_1 0x9E3D10 //uint16
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#define RCT2_X_RELATED_GLOBAL_2 0x9ABDA8 //sint16
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void sub_0x67AA18(int* source_bits_pointer, int* dest_bits_pointer, rct_drawpixelinfo *dpi){
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if (RCT2_GLOBAL(0xEDF81C, uint32) & 0x2000000){
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return; //0x67AAB3
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}
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if (RCT2_GLOBAL(0xEDF81C, uint32) & 0x4000000){
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return; //0x67AFD8
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}
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int ebx = RCT2_GLOBAL(0xEDF808, uint32);
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ebx = RCT2_GLOBAL(ebx * 2 + source_bits_pointer,uint16);
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int ebp = dest_bits_pointer;
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ebx += (int)source_bits_pointer;
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StartLoop:
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ebx = ebx;
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int cx = RCT2_GLOBAL(ebx, uint16);
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RCT2_GLOBAL(0x9ABDB4, uint8) = cx & 0xFF;
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ebx += 2;
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cx &= 0xFF7F;
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int esi = ebx;
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int edx = (cx & 0xFF00) >> 8;
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ebx += cx;
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edx -= RCT2_GLOBAL(0xEDF80C, sint32);
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int edi = ebp;
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if (edx > 0){
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edi += edx;
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}
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else{
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esi -= edx;
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cx += edx & 0xFFFF;
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if (cx <= 0){
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goto TestLoop;
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//jump to 0x67AA97
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}
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edx &= 0xFFFF0000;
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}
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edx += cx;
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edx -= RCT2_GLOBAL(0x9ABDA8, sint16);
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if (edx > 0){
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cx -= edx;
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if (cx <= 0){
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goto TestLoop;
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//jump to 0x67AA97
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}
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}
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if (cx & 1){
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cx >>= 1;
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RCT2_GLOBAL(edi, uint8) = RCT2_GLOBAL(esi, uint8);
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}
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else cx >>= 1;
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if (cx & 1){
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cx >>= 1;
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RCT2_GLOBAL(edi, uint16) = RCT2_GLOBAL(esi, uint16);
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}
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else cx >>= 1;
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for (int i = cx; i > 0; --i, edi++, esi++){
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RCT2_GLOBAL(edi, uint16) = RCT2_GLOBAL(esi, uint16);
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}
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TestLoop:
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if (!(RCT2_GLOBAL(0x9ABDB4, uint8) & 0x80)) goto StartLoop;
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edx = RCT2_GLOBAL(0x9ABDB0, sint16);
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ebp += edx;
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RCT2_GLOBAL(0x9ABDAC, sint16)--;
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if (RCT2_GLOBAL(0x9ABDAC, sint16))goto StartLoop;
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}
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/*
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* rct2: 0x67A934 title screen bitmaps on buttons
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* This function readies all the global vars for copying the sprite data onto the screen
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@ -205,7 +276,10 @@ void sub_0x67A934(rct_drawpixelinfo *dpi, int x, int y){
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RCT2_GLOBAL(0x9ABDB0, uint16) = dpi->width + dpi->pitch;
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// I dont think it uses ecx, edx but just in case
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RCT2_CALLPROC_X_EBPSAFE(0x67AA18, 0, 0, translated_x, translated_y, RCT2_GLOBAL(0x9E3D08, uint32), bits_pointer, dpi);
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//esi is the source and bits_pointer is the destination
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sub_0x67AA18(RCT2_GLOBAL(0x9E3D08, int*), (int*)bits_pointer, dpi);
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//RCT2_CALLPROC_X_EBPSAFE(0x67AA18, 0, 0, translated_x, translated_y, RCT2_GLOBAL(0x9E3D08, uint32), bits_pointer, dpi);
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}
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/**
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