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Finished turning the code into C removed all present bugs. Buffer draw code for basic images is done.

This commit is contained in:
Duncan Frost 2014-05-18 08:14:47 +01:00
parent 5eb445857b
commit 0fa9e6ebb9
1 changed files with 51 additions and 106 deletions
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157
src/gfx.c
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@ -277,118 +277,63 @@ void sub_0x67AA18(char* source_bits_pointer, char* dest_bits_pointer, rct_drawpi
uint16 offset_to_first_line = *(uint16*)(g1_y_start*2 + (uint32)source_bits_pointer);
//This will now point to the first line
char* source_pointer = (char*)((uint32)source_bits_pointer + offset_to_first_line);
char* dest_pointer = dest_bits_pointer;
char* next_source_pointer = (char*)((uint32)source_bits_pointer + offset_to_first_line);
char* next_dest_pointer = dest_bits_pointer;
int ebx = RCT2_GLOBAL(0xEDF808, uint32); //G1 y start location
ebx = RCT2_GLOBAL(ebx * 2 + (uint32)source_bits_pointer, uint16);//? x2?? would have though move to width*ebx
//Possibly more information is stored about each horizontal line
//maybe an x offset with each one?
int ebp = (uint32)dest_bits_pointer;
ebx += (uint32)source_bits_pointer; //Move to the correct y location?
int ecx = 0;
int edx = 0;
StartLoop:
edx = 0;
uint8 no_pixels = *source_pointer++;
uint8 gap_size = *source_pointer++;
uint8 last_data_line = no_pixels & 0x80;
//Clear the last data line bit
no_pixels &= 0x7f;
//Move this to the end
char* next_source_pointer = source_pointer + no_pixels;
int cx = RCT2_GLOBAL(ebx, uint16); //Maybe X start stop offsets
int cl = cx & 0xff;
RCT2_GLOBAL(0x9ABDB4, uint8) = cl; //start offset
//For every line in the image
for (; g1_y_end; g1_y_end--){
ebx += 2;//skip the extra offset info
cx &= 0xFF7F;
cl &= 0x7F; //??
int esi = ebx;
int dl = (cx & 0xFF00) >> 8;
int ch = 0;
cx = cl;
ebx += cx;//??
edx = dl;
edx -= RCT2_GLOBAL(0xEDF80C, sint32);//g1 x start location
int edi = ebp;
uint8 last_data_line = 0;
//For every data section in the line
while (!last_data_line){
char* source_pointer = next_source_pointer;
char* dest_pointer = next_dest_pointer;
int x_start = (int)gap_size - (int)g1_x_start;
sint8 no_pixels = *source_pointer++;
uint8 gap_size = *source_pointer++;
//The last bit in no_pixels tells you if you have reached the end of a line
last_data_line = no_pixels & 0x80;
//Clear the last data line bit so we have just the no_pixels
no_pixels &= 0x7f;
//Have our next source pointer point to the next data section
next_source_pointer = source_pointer + (int)no_pixels;
if (edx > 0){ //edx x_start
edi += edx;
dest_pointer += x_start;
//Calculates the start point of the image
int x_start = (int)gap_size - (int)g1_x_start;
if (x_start > 0){
//Since the start is positive
//We need to move the drawing surface to the correct position
dest_pointer += x_start;
}
else{
//If the start is negative we require to remove part of the image.
//This is done by moving the image pointer to the correct position.
source_pointer -= x_start;
//The no_pixels will be reduced in this operation
no_pixels += x_start;
//If there are no pixels there is nothing to draw this line
if (no_pixels <= 0) continue;
//Reset the start position to zero as we have taken into account all moves
x_start = 0;
}
int x_end = x_start + (int)no_pixels;
//If the end position is further out than the whole image
//end position then we need to shorten the line again
if (x_end > (int)g1_x_end){
//Shorten the line
no_pixels -= x_end - (int)g1_x_end;
//If there are no pixels there is nothing to draw.
if (no_pixels <= 0) continue;
}
//Finally after all those checks copy the image onto the drawing surface
memcpy(dest_pointer, source_pointer, no_pixels);
}
//Add a line to the drawing surface pointer
next_dest_pointer += (int)dpi->width + (int)dpi->pitch;
}
else{
source_pointer -= x_start;
no_pixels += x_start;
esi -= edx;
cx += edx & 0xFFFF;
if (cx <= 0) goto TestLoop;//cx
x_start = 0;
edx &= 0xFFFF0000;
}
int x_end = x_start + (int)no_pixels - (int)g1_x_end;
int dx = edx&0xFFFF;
dx += cx;
dx -= RCT2_GLOBAL(RCT2_X_END_POINT_GLOBAL, sint16);
if (dx > 0){ //dx x_end
no_pixels -= x_end;
cx -= dx;
if (cx <= 0) goto TestLoop;//cx
}
for (; no_pixels > 0; no_pixels--, dest_pointer++, source_pointer++){
*dest_pointer = *source_pointer;
}
goto TestLoop;
for (; cx > 0; cx--, edi++, esi++){
RCT2_GLOBAL(edi, uint8) = RCT2_GLOBAL(esi, uint8);
}
/*if (cx & 1){
RCT2_GLOBAL(edi, uint8) = RCT2_GLOBAL(esi, uint8);
edi+=1;
esi+=1;
}
cx >>= 1;
if (cx & 1){
RCT2_GLOBAL(edi, uint16) = RCT2_GLOBAL(esi, uint16);
edi+=2;
esi+=2;
}
cx >>= 1;
for (int i = cx; i > 0; i-=4, edi+=4, esi+=4){
RCT2_GLOBAL(edi, uint32) = RCT2_GLOBAL(esi, uint32);
}*/
TestLoop:
source_pointer = next_source_pointer;
int test = (RCT2_GLOBAL(0x9ABDB4, uint8) & 0x80);
if (!test) goto StartLoop;
//if (!last_data_line)goto StartLoop;
next_dest_pointer += (int)dpi->width + (int)dpi->pitch;
dest_pointer = next_dest_pointer;
edx = RCT2_GLOBAL(RCT2_DPI_LINE_LENGTH_GLOBAL, uint16);
ebp += edx;
test = --RCT2_GLOBAL(RCT2_Y_END_POINT_GLOBAL, sint16);
g1_y_end--;
if (g1_y_end)goto StartLoop;//test
return;
//
// if (RCT2_GLOBAL(RCT2_Y_END_POINT_GLOBAL, sint16))goto StartLoop;
}