Add object_renderer.cc
This commit is contained in:
scawful
161
src/app/zelda3/dungeon/object_renderer.cc
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161
src/app/zelda3/dungeon/object_renderer.cc
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#include "app/zelda3/dungeon/object_renderer.h"
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namespace yaze {
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namespace app {
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namespace zelda3 {
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namespace dungeon {
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void DungeonObjectRenderer::LoadObject(uint16_t objectId,
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std::array<uint8_t, 16>& sheet_ids) {
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vram_.sheets = sheet_ids;
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rom_data_ = rom()->vector();
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// Prepare the CPU and memory environment
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memory_.Initialize(rom_data_);
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// Fetch the subtype pointers for the given object ID
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auto subtypeInfo = FetchSubtypeInfo(objectId);
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// Configure the object based on the fetched information
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ConfigureObject(subtypeInfo);
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// Run the CPU emulation for the object's draw routines
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RenderObject(subtypeInfo);
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}
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SubtypeInfo DungeonObjectRenderer::FetchSubtypeInfo(uint16_t object_id) {
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SubtypeInfo info;
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// Determine the subtype based on objectId
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uint8_t subtype = 1;
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// Based on the subtype, fetch the correct pointers
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switch (subtype) {
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case 1: // Subtype 1
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info.subtype_ptr = core::subtype1_tiles + (object_id & 0xFF) * 2;
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info.routine_ptr = core::subtype1_tiles + 0x200 + (object_id & 0xFF) * 2;
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std::cout << "Subtype 1 " << std::hex << info.subtype_ptr << std::endl;
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std::cout << "Subtype 1 " << std::hex << info.routine_ptr << std::endl;
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break;
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case 2: // Subtype 2
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info.subtype_ptr = core::subtype2_tiles + (object_id & 0x7F) * 2;
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info.routine_ptr = core::subtype2_tiles + 0x80 + (object_id & 0x7F) * 2;
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break;
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case 3: // Subtype 3
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info.subtype_ptr = core::subtype3_tiles + (object_id & 0xFF) * 2;
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info.routine_ptr = core::subtype3_tiles + 0x100 + (object_id & 0xFF) * 2;
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break;
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default:
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// Handle unknown subtype
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throw std::runtime_error("Unknown subtype for object ID: " +
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std::to_string(object_id));
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}
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return info;
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}
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void DungeonObjectRenderer::ConfigureObject(const SubtypeInfo& info) {
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cpu.A = 0x03D8;
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cpu.X = 0x03D8;
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cpu.DB = 0x7E;
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// VRAM target destinations
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cpu.WriteLong(0xBF, 0x7E2000);
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cpu.WriteLong(0xCB, 0x7E2080);
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cpu.WriteLong(0xC2, 0x7E2002);
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cpu.WriteLong(0xCE, 0x7E2082);
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cpu.SetAccumulatorSize(false);
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cpu.SetIndexSize(false);
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}
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/**
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* Example:
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* the STA $BF, $CD, $C2, $CE are the location of the object in the room
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* $B2 is used for size loop
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* so if object size is setted on 07 that draw code will be repeated 7 times
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* and since Y is increasing by 4 it makes the object draw from left to right
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RoomDraw_Rightwards2x2_1to15or32:
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#_018B89: JSR RoomDraw_GetSize_1to15or32
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.next
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#_018B8C: JSR RoomDraw_Rightwards2x2
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#_018B8F: DEC.b $B2
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#_018B91: BNE .next
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#_018B93: RTS
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RoomDraw_Rightwards2x2:
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#_019895: LDA.w RoomDrawObjectData+0,X
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#_019898: STA.b [$BF],Y
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#_01989A: LDA.w RoomDrawObjectData+2,X
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#_01989D: STA.b [$CB],Y
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#_01989F: LDA.w RoomDrawObjectData+4,X
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#_0198A2: STA.b [$C2],Y
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#_0198A4: LDA.w RoomDrawObjectData+6,X
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#_0198A7: STA.b [$CE],Y
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#_0198A9: INY #4
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#_0198AD: RTS
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*/
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void DungeonObjectRenderer::RenderObject(const SubtypeInfo& info) {
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cpu.PB = 0x01;
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cpu.PC = cpu.ReadWord(0x01 << 16 | info.routine_ptr);
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// Push an initial value to the stack we can read later to confirm we are
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// done
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cpu.PushLong(0x01 << 16 | info.routine_ptr);
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int i = 0;
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while (true) {
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uint8_t opcode = cpu.ReadByte(cpu.PB << 16 | cpu.PC);
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cpu.ExecuteInstruction(opcode);
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cpu.HandleInterrupts();
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if ((i != 0 &&
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(cpu.ReadWord((0x00 << 16 | cpu.SP() + 2)) == info.routine_ptr) ||
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0x8b93 == cpu.PC)) {
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std::cout << std::hex << cpu.ReadWord((0x00 << 16 | cpu.SP() + 3))
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<< std::endl;
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break;
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}
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i++;
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}
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UpdateObjectBitmap();
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}
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// In the underworld, this holds a copy of the entire BG tilemap for
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// Layer 1 (BG2) in TILEMAPA
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// Layer 2 (BG1) in TILEMAPB
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void DungeonObjectRenderer::UpdateObjectBitmap() {
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tilemap_.reserve(0x2000);
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for (int i = 0; i < 0x2000; ++i) {
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tilemap_.push_back(0);
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}
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int tilemap_offset = 0;
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// Iterate over tilemap in memory to read tile IDs
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for (int tile_index = 0; tile_index < 512; tile_index++) {
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// Read the tile ID from memory
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int tile_id = memory_.ReadWord(0x7E2000 + tile_index);
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std::cout << "Tile ID: " << std::hex << tile_id << std::endl;
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int sheet_number = tile_id / 32;
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std::cout << "Sheet number: " << std::hex << sheet_number << std::endl;
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int row = tile_id / 8;
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int column = tile_id % 8;
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int x = column * 8;
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int y = row * 8;
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auto sheet = rom()->mutable_graphics_sheet(vram_.sheets[sheet_number]);
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// Copy the tile from VRAM using the read tile_id
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sheet->Get8x8Tile(tile_id, x, y, tilemap_, tilemap_offset);
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}
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bitmap_.Create(256, 256, 8, tilemap_);
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}
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} // namespace dungeon
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} // namespace zelda3
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} // namespace app
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} // namespace yaze
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@@ -18,176 +18,30 @@ namespace app {
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namespace zelda3 {
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namespace dungeon {
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struct PseudoVram {
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std::array<uint8_t, 16> sheets;
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std::vector<gfx::SnesPalette> palettes;
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};
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struct SubtypeInfo {
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uint32_t subtype_ptr;
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uint32_t routine_ptr;
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};
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class DungeonObjectRenderer : public SharedROM {
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public:
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struct PseudoVram {
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std::array<uint8_t, 16> sheets;
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std::vector<gfx::SnesPalette> palettes;
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};
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DungeonObjectRenderer() = default;
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void LoadObject(uint16_t objectId, std::array<uint8_t, 16>& sheet_ids) {
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vram_.sheets = sheet_ids;
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rom_data_ = rom()->vector();
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// Prepare the CPU and memory environment
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memory_.Initialize(rom_data_);
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// Fetch the subtype pointers for the given object ID
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auto subtypeInfo = FetchSubtypeInfo(objectId);
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// Configure the object based on the fetched information
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ConfigureObject(subtypeInfo);
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// Run the CPU emulation for the object's draw routines
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RenderObject(subtypeInfo);
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}
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void LoadObject(uint16_t objectId, std::array<uint8_t, 16>& sheet_ids);
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gfx::Bitmap* bitmap() { return &bitmap_; }
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auto memory() { return memory_; }
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auto mutable_memory() { return &memory_; }
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private:
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struct SubtypeInfo {
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uint32_t subtype_ptr;
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uint32_t routine_ptr;
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};
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SubtypeInfo FetchSubtypeInfo(uint16_t object_id) {
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SubtypeInfo info;
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// Determine the subtype based on objectId
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uint8_t subtype = 1;
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// Based on the subtype, fetch the correct pointers
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switch (subtype) {
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case 1: // Subtype 1
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info.subtype_ptr = core::subtype1_tiles + (object_id & 0xFF) * 2;
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info.routine_ptr =
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core::subtype1_tiles + 0x200 + (object_id & 0xFF) * 2;
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std::cout << "Subtype 1 " << std::hex << info.subtype_ptr << std::endl;
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std::cout << "Subtype 1 " << std::hex << info.routine_ptr << std::endl;
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break;
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case 2: // Subtype 2
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info.subtype_ptr = core::subtype2_tiles + (object_id & 0x7F) * 2;
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info.routine_ptr = core::subtype2_tiles + 0x80 + (object_id & 0x7F) * 2;
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break;
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case 3: // Subtype 3
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info.subtype_ptr = core::subtype3_tiles + (object_id & 0xFF) * 2;
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info.routine_ptr =
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core::subtype3_tiles + 0x100 + (object_id & 0xFF) * 2;
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break;
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default:
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// Handle unknown subtype
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throw std::runtime_error("Unknown subtype for object ID: " +
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std::to_string(object_id));
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}
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return info;
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}
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void ConfigureObject(const SubtypeInfo& info) {
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cpu.A = 0x03D8;
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cpu.X = 0x03D8;
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cpu.DB = 0x7E;
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// VRAM target destinations
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cpu.WriteLong(0xBF, 0x7E2000);
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cpu.WriteLong(0xCB, 0x7E2080);
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cpu.WriteLong(0xC2, 0x7E2002);
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cpu.WriteLong(0xCE, 0x7E2082);
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cpu.SetAccumulatorSize(false);
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cpu.SetIndexSize(false);
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}
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/**
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* Example:
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* the STA $BF, $CD, $C2, $CE are the location of the object in the room
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* $B2 is used for size loop
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* so if object size is setted on 07 that draw code will be repeated 7 times
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* and since Y is increasing by 4 it makes the object draw from left to right
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RoomDraw_Rightwards2x2_1to15or32:
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#_018B89: JSR RoomDraw_GetSize_1to15or32
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.next
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#_018B8C: JSR RoomDraw_Rightwards2x2
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#_018B8F: DEC.b $B2
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#_018B91: BNE .next
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#_018B93: RTS
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RoomDraw_Rightwards2x2:
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#_019895: LDA.w RoomDrawObjectData+0,X
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#_019898: STA.b [$BF],Y
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#_01989A: LDA.w RoomDrawObjectData+2,X
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#_01989D: STA.b [$CB],Y
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#_01989F: LDA.w RoomDrawObjectData+4,X
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#_0198A2: STA.b [$C2],Y
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#_0198A4: LDA.w RoomDrawObjectData+6,X
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#_0198A7: STA.b [$CE],Y
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#_0198A9: INY #4
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#_0198AD: RTS
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*/
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void RenderObject(const SubtypeInfo& info) {
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cpu.PB = 0x01;
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cpu.PC = cpu.ReadWord(0x01 << 16 | info.routine_ptr);
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// Push an initial value to the stack we can read later to confirm we are
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// done
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cpu.PushLong(0x01 << 16 | info.routine_ptr);
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int i = 0;
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while (true) {
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uint8_t opcode = cpu.ReadByte(cpu.PB << 16 | cpu.PC);
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cpu.ExecuteInstruction(opcode);
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cpu.HandleInterrupts();
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if ((i != 0 && (cpu.ReadWord((0x00 << 16 | cpu.SP() + 2)) ==
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info.routine_ptr) ||
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0x8b93 == cpu.PC)) {
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std::cout << std::hex << cpu.ReadWord((0x00 << 16 | cpu.SP() + 3))
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<< std::endl;
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break;
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}
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i++;
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}
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UpdateObjectBitmap();
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}
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// In the underworld, this holds a copy of the entire BG tilemap for
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// Layer 1 (BG2) in TILEMAPA
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// Layer 2 (BG1) in TILEMAPB
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void UpdateObjectBitmap() {
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tilemap_.reserve(0x2000);
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for (int i = 0; i < 0x2000; ++i) {
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tilemap_.push_back(0);
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}
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int tilemap_offset = 0;
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// Iterate over tilemap in memory to read tile IDs
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for (int tile_index = 0; tile_index < 512; tile_index++) {
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// Read the tile ID from memory
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int tile_id = memory_.ReadWord(0x7E2000 + tile_index);
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std::cout << "Tile ID: " << std::hex << tile_id << std::endl;
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int sheet_number = tile_id / 32;
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std::cout << "Sheet number: " << std::hex << sheet_number << std::endl;
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int row = tile_id / 8;
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int column = tile_id % 8;
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int x = column * 8;
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int y = row * 8;
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auto sheet = rom()->mutable_graphics_sheet(vram_.sheets[sheet_number]);
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// Copy the tile from VRAM using the read tile_id
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sheet->Get8x8Tile(tile_id, x, y, tilemap_, tilemap_offset);
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}
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bitmap_.Create(256, 256, 8, tilemap_);
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}
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SubtypeInfo FetchSubtypeInfo(uint16_t object_id);
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void ConfigureObject(const SubtypeInfo& info);
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void RenderObject(const SubtypeInfo& info);
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void UpdateObjectBitmap();
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std::vector<uint8_t> tilemap_;
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uint16_t pc_with_rts_;
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