-- Information:                             --
-- Video Mode 2 (official)                  --
--                                          --
-- Maximum sprites on screen                --
-- can be changed by compilation.           --
-- Default value is:                        --
-- MAX_SPRITES=32                           --
-- Available value is:                      --
-- MAX_SPRITES=1 to MAX_SPRITES=32 or more, --
-- but is not recomended, due of hardware   --
-- limitation.                              --
--                                          --
-- Vertical tiles on VRAM,                  --
-- can be changed by compilation,           --
-- but is not recomended.                   --
-- Default value is:                        --
-- VRAM_TILES_V=32                          --
--                                          --
-- Numbers of screen sections,              --
-- can be changed by compilation.           --
-- Default value is:                        --
-- SCREEN_SECTIONS_COUNT=1                  --
-- Only height size and position of         --
-- screen sections can changed:             --
-- * width size = VRAM width tiles,         --
-- * height size = 1 to 208 pixels          --
-- * numbers = 1 to 28 sections             --
-- * position = X axis                      --
--                                          --
-- Numbers of video lines to render,        --
-- can be changed by compilation,           --
-- but is not recommended, changes the      --
-- CPU cyles.                               --
-- Default value is:                        --
-- FRAME_LINES=SCREEN_TILES_V*TILE_HEIGHT   --
--                                          --
-- First render line is used to adjust      --
-- vertical centering if the value          --
-- FRAME_LINES is changed.                  --
-- Can be changed by compilation.           --
-- Default value is:                        --
-- FIRST_RENDER_LINE=20                     --

-- Sites:
-- http://uzebox.org/wiki/index.php?title=Video_Modes
-- http://uzebox.org/wiki/index.php?title=Mode_2_Sprites_Guide
-- http://uzebox.org/wiki/index.php?title=Mode_2_ScreenSections_Guide
-- https://github.com/Uzebox/uzebox
-- https://raw.githubusercontent.com/Uzebox/uzebox/master/kernel/videoMode2/videoMode2.def.h
-- https://raw.githubusercontent.com/Uzebox/uzebox/master/kernel/videoMode2/videoMode2.s

return {
  screen  = {
    width    = 144,
    height   = 224,
    vsync    =  60,
    origin   = {
      x = 0,
      y = 0,
    },
    -- Total of unique texels, pixels and vertices on VRAM --
    pixels   = 13824,
    texels   =   288,
    vertices = false,
  },
  colours = {
    total       = 256,
    limit       = false,
    transparent = {
      sprite = colourKey,
      tile   = false,
    },
    palettes    = false,
  },
  meshes  = false,
  shaders = {
    api          = false,
    version      = false,
    fragment     = false,
    vectex       = false,
    geometry     = false,
    tessellation = false,
  },
  physic  = false,
  sprites = {
    -- Limit sprites on screen --
    onScreen  = 32,
    -- Limit sprites on line (scanline) without flickering --
    onLine    =  5,
    transform = {
      move   = true,
      rotate = false,
      scale  = 'verticalFlip',
      shear  = false,
      affine = false,
    },
    -- Sprite sizes in pixels --
    sizes     = {
      {
        width  = 6,
        height = 8,
      },
    },
  },
  tiles   = {
    layers = {
      {
        -- Total tiles and pixels on VRAM --
        onVRAM         = {
          screenSections = {
            all = {
              Xtiles =    32,
              Ytiles =    32,
              tiles  =  1024,
              pixels = 49152,
            },
          },
          tiles          = 'screenSections',
          pixels         = 'screenSections',
        },
        -- Total tiles and pixels on screen --
        onScreen       = {
          screenSections = {
            -- On screen section with support scrolling X and/or Y, --
            -- will be include one tile by axis                     --
            all = {
              Xtiles =    24+1,
              Ytiles =    28+1,
              tiles  =   672+24+28+1,
              pixels = 32256,
            },
          },
          tiles          = 'screenSections',
          pixels         = 'screenSections',
        },
        -- Total of unique tiles on VRAM --
        unique         = 256,
        screenSections = {
          mirror   = false,
          main     = {
            optional    = false,
            moveSection = false,
            {
              startSection = {
                x = 'startVRAM',
                y = 'startVRAM',
              },
              endSection   = {
                x = 'endVRAM',
                y = 'endVRAM',
              },
              size         = {
                -- Tile size in pixels --
                width  = 6,
                height = 8,
              },
              transform    = {
                move   = true,
                rotate = false,
                scale  = false,
                shear  = false,
                affine = false,
              },
            },
          },
          overlay0 = {
            optional    = true,
            moveSection = true,
            {
              startSection = {
                x = 'startVRAM',
                y = 'free',
              },
              endSection   = {
                x = 'endVRAM',
                y = 'free',
              },
              size         = {
                -- Tile size in pixels --
                width  = 6,
                height = 8,
              },
              transform    = {
                move   = true,
                rotate = false,
                scale  = false,
                shear  = false,
                affine = false,
              },
            },
          },
          overlay1 = {
            optional    = true,
            moveSection = true,
            {
              startSection = {
                x = 'startVRAM',
                y = 'free',
              },
              endSection   = {
                x = 'endVRAM',
                y = 'free',
              },
              size         = {
                -- Tile size in pixels --
                width  = 6,
                height = 8,
              },
              transform    = {
                move   = true,
                rotate = false,
                scale  = false,
                shear  = false,
                affine = false,
              },
            },
          },
        },
      },
    },
  },
}