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feat(editor): enhance screen editor with on-demand tilemap caching

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- Implemented a new tilemap system for 8x8 tiles in the ScreenEditor, allowing for on-demand texture creation and caching of tiles.
- Combined multiple sheets into a single tilemap, improving memory efficiency and rendering performance.
- Updated tile drawing logic to extract and cache tiles from the atlas, ensuring textures are created only when needed.

Benefits:
- Enhances performance by reducing unnecessary texture creation.
- Improves user experience with faster tile rendering and management in the editor.
This commit is contained in:
scawful
2025-10-13 15:37:32 -04:00
parent c95e5ac7ef
commit 360406bd4c
3 changed files with 121 additions and 34 deletions
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25
src/zelda3/screen/title_screen.cc
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@@ -98,8 +98,17 @@ absl::Status TitleScreen::BuildTileset(Rom* rom) {
}
absl::Status TitleScreen::LoadTitleScreen(Rom* rom) {
// Title screen tilemap is stored in compressed format
// The tilemap data pointer is stored at ROM address 0x0137A (3 bytes)
// Title screen tilemap data addresses (PC format)
// These point to tilemap data for different screen sections
constexpr int kTilemapAddresses[7] = {
0x53de4, 0x53e2c, 0x53e08, 0x53e50, 0x53e74, 0x53e98, 0x53ebc};
constexpr int kTilemapGfxAddresses[7] = {
0x53ee0, 0x53f04, 0x53ef2, 0x53f16, 0x53f28, 0x53f3a, 0x53f4c};
// Note: The title screen uses a simpler tilemap format than dungeons
// For now, we'll use the compressed format loader which should work
// TODO: Implement proper title screen tilemap loading using the addresses above
ASSIGN_OR_RETURN(uint8_t byte0, rom->ReadByte(0x137A + 3));
ASSIGN_OR_RETURN(uint8_t byte1, rom->ReadByte(0x1383 + 3));
ASSIGN_OR_RETURN(uint8_t byte2, rom->ReadByte(0x138C + 3));
@@ -224,10 +233,12 @@ absl::Status TitleScreen::RenderBG1Layer() {
int dest_pos = dest_y * 256 + dest_x; // BG1 is 256 pixels wide
// Copy pixel with palette application
// Title screen uses 3BPP graphics (8 colors per palette)
if (src_pos < tile8_bitmap_data.size() && dest_pos < bg1_data.size()) {
uint8_t pixel_value = tile8_bitmap_data[src_pos];
// Apply palette index (each palette has 8 colors, pixel uses lower 3 bits)
bg1_data[dest_pos] = (pixel_value & 0x07) | (palette << 3);
// Apply palette index (title screen uses 8-color palettes)
// Mask to 3 bits for 8 colors, then apply palette offset
bg1_data[dest_pos] = (pixel_value & 0x07) | ((palette & 0x07) << 3);
}
}
}
@@ -275,10 +286,12 @@ absl::Status TitleScreen::RenderBG2Layer() {
int dest_pos = dest_y * 256 + dest_x; // BG2 is 256 pixels wide
// Copy pixel with palette application
// Title screen uses 3BPP graphics (8 colors per palette)
if (src_pos < tile8_bitmap_data.size() && dest_pos < bg2_data.size()) {
uint8_t pixel_value = tile8_bitmap_data[src_pos];
// Apply palette index (each palette has 8 colors, pixel uses lower 3 bits)
bg2_data[dest_pos] = (pixel_value & 0x07) | (palette << 3);
// Apply palette index (title screen uses 8-color palettes)
// Mask to 3 bits for 8 colors, then apply palette offset
bg2_data[dest_pos] = (pixel_value & 0x07) | ((palette & 0x07) << 3);
}
}
}