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implemented zarbys decompression and conversion code to get a graphics sheet on the screen finally

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This commit is contained in:
Justin Scofield
2022-06-19 11:57:42 -04:00
parent 4734062067
commit 39f451b3fc
4 changed files with 119 additions and 58 deletions
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57
src/application/Data/rom.cc
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@@ -115,15 +115,7 @@ uint32_t ROM::GetRomPosition(int direct_addr, uint snes_addr) const {
return filePos;
}
uchar* ROM::LoadGraphicsSheet(int offset) {
auto tilesheet_position = Core::Constants::gfx_1_pointer +
(offset * Core::Constants::UncompressedSheetSize);
auto data = Decompress(tilesheet_position);
return SNES3bppTo8bppSheet((uchar*)data);
}
// char *buffer = new char[0x800] AKA sheet_buffer_in 3bpp
uchar *ROM::SNES3bppTo8bppSheet(uchar *sheet_buffer_in) // 128x32
uchar *ROM::SNES3bppTo8bppSheet(uchar *buffer_in, int sheet_id) // 128x32
{
// 8bpp sheet out
const uchar bitmask[8] = {0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01};
@@ -132,6 +124,11 @@ uchar *ROM::SNES3bppTo8bppSheet(uchar *sheet_buffer_in) // 128x32
int yy = 0;
int pos = 0;
int ypos = 0;
if (sheet_id != 0) {
yy = sheet_id;
}
for (int i = 0; i < 64; i++) // for each tiles //16 per lines
{
for (int y = 0; y < 8; y++) // for each lines
@@ -139,12 +136,12 @@ uchar *ROM::SNES3bppTo8bppSheet(uchar *sheet_buffer_in) // 128x32
//[0] + [1] + [16]
for (int x = 0; x < 8; x++) {
unsigned char b1 = (unsigned char)((
sheet_buffer_in[(y * 2) + (24 * pos)] & (bitmask[x])));
buffer_in[(y * 2) + (24 * pos)] & (bitmask[x])));
unsigned char b2 =
(unsigned char)(sheet_buffer_in[((y * 2) + (24 * pos)) + 1] &
(unsigned char)(buffer_in[((y * 2) + (24 * pos)) + 1] &
(bitmask[x]));
unsigned char b3 =
(unsigned char)(sheet_buffer_in[(16 + y) + (24 * pos)] &
(unsigned char)(buffer_in[(16 + y) + (24 * pos)] &
(bitmask[x]));
unsigned char b = 0;
if (b1 != 0) {
@@ -180,7 +177,7 @@ char *ROM::Decompress(int pos, bool reversed) {
unsigned char cmd = 0;
unsigned int length = 0;
unsigned char databyte = (unsigned char)current_rom_[pos];
uchar databyte = current_rom_[pos];
while (true) {
databyte = (unsigned char)current_rom_[pos];
if (databyte == 0xFF) // End of decompression
@@ -246,6 +243,40 @@ char *ROM::Decompress(int pos, bool reversed) {
return buffer;
}
SDL_Surface* ROM::GetGraphicsSheet(int num_sheets) {
int height = 32 * num_sheets;
SDL_Surface *surface =
SDL_CreateRGBSurfaceWithFormat(0, 128, height, 8, SDL_PIXELFORMAT_INDEX8);
std::cout << "Drawing surface" << std::endl;
uchar *sheet_buffer = nullptr;
// int sheet_buffer_pos = 0;
for (int i = 0; i < 8; i++) {
surface->format->palette->colors[i].r = (unsigned char)(i * 31);
surface->format->palette->colors[i].g = (unsigned char)(i * 31);
surface->format->palette->colors[i].b = (unsigned char)(i * 31);
}
unsigned int snesAddr = 0;
unsigned int pcAddr = 0;
for (int i = 0; i < num_sheets; i++) {
snesAddr =
(unsigned int)((((unsigned char)(current_rom_[0x4F80 + i]) <<
16) |
((unsigned char)(current_rom_[0x505F + i]) << 8)
|
((unsigned char)(current_rom_[0x513E]))));
pcAddr = SnesToPc(snesAddr);
std::cout << "Decompressing..." << std::endl;
char *decomp = Decompress(pcAddr);
std::cout << "Converting to 8bpp sheet..." << std::endl;
sheet_buffer = SNES3bppTo8bppSheet((uchar *)decomp, i);
std::cout << "Assigning pixel data..." << std::endl;
}
surface->pixels = sheet_buffer;
return surface;
}
int AddressFromBytes(uchar addr1, uchar addr2, uchar addr3) {
return (addr1 << 16) | (addr2 << 8) | addr3;
}