SML2 Tile Viewer

local i = 0
local cx = 0
local cy = 0
local p1_cx = 0
local p1_cy = 0
local p2_cx = 0
local p2_cy = 0
local drawn = 0

function drawTile(x, y)
    local px = (x * 0x10) - p2_cx + 176
    local py = (y * 0x10) - p2_cy + 168
    if (px > -16 and px < 160 and py > -16 and py < 136) then
        drawn = drawn + 1
        memory.usememorydomain("System Bus")
        local index = 0xB000 + x + 0x100 * y
        while index > 0xFFFF do index = index - 0x10000 end
        local tile = memory.readbyte(index)

        if (tile >= 0x04 and tile < 0x08) or (tile >= 0x10 and tile < 0x38) then
            -- solid
            gui.drawRectangle(px, py, 16, 16, 0xFFFFFFFF, 0xAAFFFFFF)
        elseif tile >= 0x38 and tile < 0x48 then
            -- platform
            gui.drawRectangle(px, py, 16, 3, 0xFFFFFFFF, 0xAAFFFFFF)
        elseif tile == 0x48 or tile == 0x49 then
            -- coin
            gui.drawRectangle(px, py, 16, 16, 0xFFFFFFFF, 0xAAFFFF00)
        elseif tile == 0x4A then
            -- level clear and save win
            gui.drawRectangle(px, py, 16, 16, 0xFFFFFFFF, 0xAAFF0000)
            gui.drawText(px + 4, py, "!", 0xFF000000)
        elseif tile == 0x4B then
            -- level clear and DON'T save win
            gui.drawRectangle(px, py, 16, 16, 0xFFFFFFFF, 0xAAFF0000)
            gui.drawText(px + 4, py, "X", 0xFF000000)
        elseif tile == 0x50 or tile == 0x51 then
            -- spikes
            gui.drawRectangle(px, py, 16, 16, 0xFFFFFFFF, 0xAAFFFFFF)
            gui.drawLine(px, py + 0, px + 3, py + 15, 0xFF000000)
            gui.drawLine(px + 4, py + 15, px + 7, py + 0, 0xFF000000)
            gui.drawLine(px + 8, py + 0, px + 11, py + 15, 0xFF000000)
            gui.drawLine(px + 12, py + 15, px + 15, py + 0, 0xFF000000)
        elseif tile >= 0x4C and tile < 0x58 then
            -- water
            gui.drawRectangle(px, py, 16, 16, 0xFFFFFFFF, 0xAA0000FF)
        elseif tile == 0x00 or tile == 0x04 then
            -- breakable block
            gui.drawRectangle(px, py, 16, 16, 0xFFFFFFFF, 0xAAFFFFFF)
            gui.drawLine(px + 3, py + 7, px + 4, py + 6, 0xFF000000)
            gui.drawLine(px + 5, py + 6, px + 6, py + 7, 0xFF000000)
            gui.drawLine(px + 9, py + 7, px + 10, py + 6, 0xFF000000)
            gui.drawLine(px + 11, py + 6, px + 12, py + 7, 0xFF000000)
        elseif tile == 0x01 or tile == 0x02 or tile == 0x7E then
            -- ? block
            gui.drawRectangle(px, py, 16, 16, 0xFFFFFFFF, 0xAAFFFFFF)
            gui.drawText(px + 4, py, "?", 0xFF000000)
        elseif tile >= 0x08 and tile < 0x10 then
            -- pipe
            gui.drawRectangle(px, py, 16, 16, 0xFFFFFFFF, 0xAAFFFFFF)
            if tile == 0x08 then
                gui.drawRectangle(px+4, py, 12, 4, 0xFFFFFFFF, 0xAA00FF00)
            elseif tile == 0x09 then
                gui.drawRectangle(px, py, 12, 4, 0xFFFFFFFF, 0xAA00FF00)
            elseif tile == 0x0A then
                gui.drawRectangle(px+4, py + 12, 12, 4, 0xFFFFFFFF, 0xAA00FF00)
            elseif tile == 0x0B then
                gui.drawRectangle(px, py + 12, 12, 4, 0xFFFFFFFF, 0xAA00FF00)
            elseif tile == 0x0C then
                gui.drawRectangle(px, py+4, 4, 12, 0xFFFFFFFF, 0xAA00FF00)
            elseif tile == 0x0D then
                gui.drawRectangle(px, py, 4, 12, 0xFFFFFFFF, 0xAA00FF00)
            elseif tile == 0x0E then
                gui.drawRectangle(px+12, py+4, 4, 12, 0xFFFFFFFF, 0xAA00FF00)
            elseif tile == 0x0F then
                gui.drawRectangle(px+12, py, 4, 12, 0xFFFFFFFF, 0xAA00FF00)
            end
        else
            -- empty
            gui.drawRectangle(px, py, 16, 16, 0xFFFFFFFF)
        end

        if index == 0xA2D5 then
            gui.drawText(px, py, "!!", 0xFFFF0000)
        end

        memory.usememorydomain("Cart RAM")
    end
end

-- Start Main --

console.writeline("Starting...")
memory.usememorydomain("Cart RAM")

while true do
    --gui.drawText(10, 10, "cx: " .. cx)
    --gui.drawText(10, 30, "cy: " .. cy)

    p2_cy = p1_cy
    p2_cx = p1_cx
    p1_cy = cy
    p1_cx = cx

    cy = memory.read_u16_be(0xF0E)
    cx = memory.read_u16_be(0xF0A)

    drawn = 0
    local sx = bit.rshift((cx - 176), 4)
    local sy = bit.rshift((cy - 168), 4)
    local m = 0
    while m < 11 do
        local n = 0
        while n < 10 do
            drawTile(sx + m, sy + n)
            n = n + 1
        end
        m = m + 1
    end

    i = i + 1
    --gui.drawText(10, 60, "sx: " .. sx)
    --gui.drawText(10, 75, "sy: " .. sy)
    --gui.drawText(10, 90, "drawn: " .. drawn)

    emu.frameadvance()
end

console.writeline("Done.")