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Initialize mode0 backgrounds, cleanup skeleton code

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scawful
2024-04-19 16:03:15 -04:00
parent 07feeac7c2
commit e8fe8a6c79
1 changed files with 23 additions and 23 deletions
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46
src/app/emu/video/ppu.cc
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@@ -55,20 +55,13 @@ void Ppu::RenderScanline() {
}
}
// Fetch the tile data from VRAM, tile map data from memory, and palette data
// from CGRAM
// UpdateTileData(); // Fetches the tile data from VRAM and stores it in
// an internal buffer
UpdateTileMapData(); // Fetches the tile map data from memory and stores it
// in an internal buffer
UpdatePaletteData(); // Fetches the palette data from CGRAM and stores it in
// an internal buffer
// Fetch tile data from VRAM, tile map from memory, palette data from CGRAM
UpdateTileData();
UpdateTileMapData();
UpdatePaletteData();
// Render the background layers, taking into account the current mode and
// layer priorities
for (int layer = 1; layer <= 4; ++layer) {
RenderBackground(layer); // Renders the specified background layer into an
// internal layer buffer
RenderBackground(layer);
}
// Render the sprite layer, taking into account sprite priorities and
@@ -111,7 +104,6 @@ void Ppu::Notify(uint32_t address, uint8_t data) {
// Write the data to OAM
break;
case BGMODE:
// Update the Ppu mode settings
UpdateModeSettings();
break;
case MOSAIC:
@@ -261,19 +253,35 @@ void Ppu::Notify(uint32_t address, uint8_t data) {
void Ppu::UpdateModeSettings() {
// Read the Ppu mode settings from the Ppu registers
uint8_t modeRegister = memory_.ReadByte(PpuRegisters::INIDISP);
uint8_t mode_register = memory_.ReadByte(PpuRegisters::BGMODE);
// Mode is stored in the lower 3 bits
auto mode = static_cast<BackgroundMode>(modeRegister & 0x07);
auto mode = static_cast<BackgroundMode>(mode_register & 0x07);
// Update the tilemap, tile data, and palette settings
switch (mode) {
case BackgroundMode::Mode0:
// Mode 0: 4 layers, each 2bpp (4 colors)
bg_layers_[0].tilemap_base_address = memory_.ReadByte(BG1SC);
bg_layers_[0].tile_data_base_address = memory_.ReadByte(BG12NBA);
bg_layers_[0].color_depth = BackgroundLayer::ColorDepth::BPP_2;
bg_layers_[1].tilemap_base_address = memory_.ReadByte(BG2SC);
bg_layers_[1].tile_data_base_address = memory_.ReadByte(BG12NBA);
bg_layers_[1].color_depth = BackgroundLayer::ColorDepth::BPP_2;
bg_layers_[2].tilemap_base_address = memory_.ReadByte(BG3SC);
bg_layers_[2].tile_data_base_address = memory_.ReadByte(BG34NBA);
bg_layers_[2].color_depth = BackgroundLayer::ColorDepth::BPP_2;
bg_layers_[3].tilemap_base_address = memory_.ReadByte(BG4SC);
bg_layers_[3].tile_data_base_address = memory_.ReadByte(BG34NBA);
bg_layers_[3].color_depth = BackgroundLayer::ColorDepth::BPP_2;
break;
case BackgroundMode::Mode1:
// Mode 1: 2 layers, 4bpp (16 colors), 1 layer, 2bpp (4 colors)
break;
case BackgroundMode::Mode2:
@@ -301,18 +309,10 @@ void Ppu::UpdateModeSettings() {
break;
default:
// Invalid mode setting, handle the error or set default settings
// ...
break;
}
// Update the internal state of the Ppu based on the mode settings
// Update tile data, tilemaps, sprites, and palette based on the mode settings
UpdateTileData();
UpdatePaletteData();
}
// Internal methods to handle Ppu rendering and operations
void Ppu::UpdateTileData() {
// Fetch tile data from VRAM and store it in the internal buffer
for (uint16_t address = 0; address < tile_data_size_; ++address) {