Display

Terminology

• bgra: blue, green, red, alpha in one uint it looks like 0xAARRGGBB
• bgrx: blue, green, red, reserved in one uint it looks like 0xRRGGBB
  reserved means it is ignored and does nothing

Buffer display modes (0x0X)

these display modes are just raw bgra buffers

• 0x00: 512x512, 1 048 576 bytes
• 0x01: 512x384, 786 432 bytes currently there is only a 512x512 version (0x00)

Tiled display modes (0x1X)

These work with tiles and sprites: tiles and sprites have alpha

4 layers:

• clear color
• sprites with draw_behind bit set
• tiles
• sprites without draw_behind bit set

Sprites:

• sprite positions will be for its top left corner
• sprites will be rotated around its center
• sprites will scroll with tiles

sprite attributes: 0b0       0           0      0      0      000
                     visible draw_behind v-flip h-flip unused palette

0x11: 512x384 Tiled:

total size: 34_868 bytes

• clear color: 4 bytes
• 8 palettes: 16 colors each bgra, 64 bytes per palette, 512 bytes
• 256 images: 16x16 4 bits per pixel, 128 bytes per image, 32768 bytes
• tile scroll x: 1 byte, values are clamped to 0-32 inclusive
• tile scroll y: 1 byte, values are clamped to 0-32 inclusive
• tile indexes: 34x26 1 byte per tile index, 884 bytes
• tile palettes: 34x26 4 bits per palette, 442 bytes
• sprites: image_index: u8, attributes: u8, x_pos: u16, y_pos: u16, rotation: u16, 32 sprites, 256 bytes