# Quirks test

# This is a visual adaptation of some of the tests I wrote for Silicon8
# (https://github.com/Timendus/silicon8/tree/main/tests) and some newly written
# tests for specific quirks.

:include "../utils/helpers.8o"
:include "../utils/menu.8o"
:include "../utils/text-rendering.8o"

:const OFF 0
:const ON 1
:const BOTH 2
:const NONE 3
:const LORES 4
:const HIRES 5
:const ERR1 6
:const ERR2 7
:const ERR3 8

:const CHIP8 1
:const SCHIP_MODERN 2
:const XOCHIP 3
:const SCHIP_LEGACY 4

: main
  clear
  i := 0x1FF
  load v0
  if v0 == CHIP8        then jump quirks-chip8
  if v0 == SCHIP_MODERN then jump quirks-schip
  if v0 == SCHIP_LEGACY then jump quirks-schip-legacy
  if v0 == XOCHIP       then jump quirks-xochip

  text  6  2 quirks-choose
  text 10 10 quirks-str-chip8
  text 10 15 quirks-str-schip
  text 10 20 quirks-str-xochip
  render-version
 
  :unpack 0xA quirks-menu
  v2 := 2
  jump menu-start

: superchip-menu
  clear
  text 10  2 quirks-choose-superchip
  text 18 12 quirks-str-modern
  text 18 17 quirks-str-legacy
  render-version

  :unpack 0xA superchip-target-menu
  v2 := 1
  jump menu-start

: render-version
  x := 50
  y := 27
  i := version-0-0
  sprite x y 4
  x := 58
  i := version-1-0
  sprite x y 4
  return

:segment data

: quirks-menu
  6 11 :pointer quirks-chip8
  6 16 :pointer superchip-menu
  6 21 :pointer quirks-xochip

: quirks-choose
  str "PICK PLATFORM" 0
: quirks-str-chip8
  str "1 CHIP-8" 0
: quirks-str-schip
  str "2 SUPER-CHIP" 0
: quirks-str-xochip
  str "3 XO-CHIP" 0

: superchip-target-menu
  14 13 :pointer quirks-schip
  14 18 :pointer quirks-schip-legacy

: quirks-choose-superchip
  str "PICK TARGET" 0
: quirks-str-modern
  str "1 MODERN" 0
: quirks-str-legacy
  str "2 LEGACY" 0

:segment code

: quirks-chip8
  i := scratchpad
  v0 := CHIP8
  save v0
  jump quirks-run-tests

: quirks-schip
  i := scratchpad
  v0 := SCHIP_MODERN
  save v0
  jump quirks-run-tests

: quirks-schip-legacy
  i := scratchpad
  v0 := SCHIP_LEGACY
  save v0
  jump quirks-run-tests

: quirks-xochip
  i := scratchpad
  v0 := XOCHIP
  save v0

: quirks-run-tests
  waitKeyRelease
  clear

  # Determine frames per second for dispQuirk
  i := scratchpad
  load v0
  if v0 == CHIP8 begin
    get-frames-per-second-chip8

    # We expect the inner loop with 30 `sprite`s to have been able to run six
    # times in the timespan of 180 interrupts
    v0 := ON
    if v3 != 0 then v0 := OFF
    if v2 > 6 then v0 := OFF
    if v2 < 6 then v0 := ERR1
    i := scratchpad-plus-1
    save v0
  else              # Superchip & XO-CHIP
    get-frames-per-second-schip-xochip

    # We expect the inner loop with 30 `sprite`s to have been able to run 3
    # times in the timespan of 90 interrupts
    v0 := ON
    if v3 != 0 then v0 := OFF
    if v2 > 3 then v0 := OFF
    if v2 < 3 then v0 := ERR1
    i := scratchpad-plus-1
    save v0

    # Do the test again, but now in hires mode
    hires
    clear
    get-frames-per-second-hires

    # We expect the inner loop with 30 `sprite`s to have been able to run 3
    # times in the timespan of 90 interrupts
    v1 := ON
    if v3 != 0 then v1 := OFF
    if v2 > 3 then v1 := OFF
    if v2 < 3 then v1 := ERR1
    i := scratchpad-plus-1
    load v0
    if v0 == ERR1 then jump quirks-combined-vblank-skip
    if v1 == ERR1 begin
      v0 := ERR1
      jump quirks-combined-vblank-skip
    end
    if v0 == OFF begin
      if v1 == OFF then v0 := NONE
      if v1 == ON  then v0 := HIRES
    end
    if v0 == ON begin
      if v1 == OFF then v0 := LORES
      if v1 == ON  then v0 := BOTH
    end
: quirks-combined-vblank-skip
    i := scratchpad-plus-1
    save v0

    lores
  end

  # Determine if sprites get clipped vertically
  clear
  i := cursor
  v0 := 28
  v1 := 29
  sprite v0 v1 6
  v0 := 22
  v1 := 2
  sprite v0 v1 2
  v5 := vF
  v0 := 34
  sprite v0 v1 2
  v6 := vF

  # Determine if sprites get clipped horizontally
  clear
  i := cursor
  v0 := 61
  v1 := 5
  sprite v0 v1 6
  v0 := 3
  v1 := 4
  sprite v0 v1 2
  v7 := vF
  v1 := 10
  sprite v0 v1 2
  v8 := vF

  # Determine if sprites get wrapped (both directions)
  clear
  v0 := 110
  v1 := 50
  sprite v0 v1 6 # Should draw at 46,18
  v0 := 40
  v1 := 17
  sprite v0 v1 2
  v9 := vF
  v0 := 52
  sprite v0 v1 2
  v9 += vF
  v1 := 23
  sprite v0 v1 2
  v9 += vF
  v0 := 40
  sprite v0 v1 2
  v9 += vF

  # Save result
  v0 := OFF
  # Clipping
  if v5 == 0 then v0 := ON
  if v5 != v6 then v0 := ERR1
  if v5 != v7 then v0 := ERR1
  if v5 != v8 then v0 := ERR1
  # Wrapping
  if v9 != 4 then v0 := ERR2
  i := scratchpad-plus-2
  save v0

  # If SuperCHIP or XO-CHIP, do it again in hires
  i := scratchpad
  load v0
  if v0 != CHIP8 begin
    hires
    # Determine if sprites get clipped vertically
    clear
    i := cursor
    v0 := 60
    v1 := 61
    sprite v0 v1 6
    v0 := 54
    v1 := 2
    sprite v0 v1 2
    v5 := vF
    v0 := 66
    sprite v0 v1 2
    v6 := vF

    # Determine if sprites get clipped horizontally
    clear
    i := cursor
    v0 := 125
    v1 := 5
    sprite v0 v1 6
    v0 := 3
    v1 := 4
    sprite v0 v1 2
    v7 := vF
    v1 := 10
    sprite v0 v1 2
    v8 := vF

    # Determine if sprites get wrapped (both directions)
    clear
    v0 := 174
    v1 := 82
    sprite v0 v1 6 # Should draw at 46,18
    v0 := 40
    v1 := 17
    sprite v0 v1 2
    v9 := vF
    v0 := 52
    sprite v0 v1 2
    v9 += vF
    v1 := 23
    sprite v0 v1 2
    v9 += vF
    v0 := 40
    sprite v0 v1 2
    v9 += vF

    # Determine result
    v1 := OFF
    # Clipping
    if v5 == 0 then v1 := ON
    if v5 != v6 then v1 := ERR1
    if v5 != v7 then v1 := ERR1
    if v5 != v8 then v1 := ERR1
    # Wrapping
    if v9 != 4 then v1 := ERR2

    # Compare with previous result
    i := scratchpad-plus-2
    load v0

    if v0 == ERR1 begin
      if v1 == ERR1 then jump quirks-combined-wrapping-skip
      v0 := ERR3
      jump quirks-combined-wrapping-skip
    end
    if v0 == ERR2 begin
      if v1 == ERR2 then jump quirks-combined-wrapping-skip
      v0 := ERR3
      jump quirks-combined-wrapping-skip
    end
    if v1 == ERR1 begin
      v0 := ERR3
      jump quirks-combined-wrapping-skip
    end
    if v1 == ERR2 begin
      v0 := ERR3
      jump quirks-combined-wrapping-skip
    end

    if v0 == ON begin
      if v1 == ON  then v0 := BOTH
      if v1 == OFF then v0 := LORES
    end
    if v0 == OFF begin
      if v1 == ON  then v0 := HIRES
      if v1 == OFF then v0 := NONE
    end
: quirks-combined-wrapping-skip
    i := scratchpad-plus-2
    save v0
    lores
  end

  # Present results

  clear

  # vfQuirk
  # When using &, | or ^, the flags register always gets reset to 0
  text 1 1 quirks-vf
  v5 := 0
  vF := 15
  v0 &= v0
  if vF == 0 then v5 := 1
  v6 := 0
  vF := 15
  v0 |= v0
  if vF == 0 then v6 := 1
  v7 := 0
  vF := 15
  v0 ^= v0
  if vF == 0 then v7 := 1
  i := scratchpad
  load v0
  i := flag-err
  if v0 == CHIP8 begin
    if v5 == 1 then i := flag-ok
  else
    # Selected SCHIP or XO-CHIP
    if v5 == 0 then i := flag-ok
  end
  x := 59
  y := 2
  sprite x y 3
  i := quirks-off
  if v5 == 1 then i := quirks-on
  if v5 != v6 then i := quirks-inconsistent-1
  if v5 != v7 then i := quirks-inconsistent-2
  vD := 42
  vE := 1
  drawText

  # memQuirk
  # When reading or writing memory, i gets incremented
  text 1 6 quirks-mem
  v0 := 1
  v1 := 2
  v2 := 3
  v3 := 4
  v4 := 5
  i := scratchpad-plus-3
  save v4
  v0 := 11
  v1 := 12
  v2 := 13
  i := scratchpad-plus-3
  save v2
  load v0
  v5 := v0
  load v0
  v6 := v0

  i := scratchpad
  load v0
  i := flag-err
  v1 := 0
  if v0 == CHIP8 then jump expect-memquirk
  if v0 == SCHIP_MODERN then jump expect-no-memquirk
  if v0 == SCHIP_LEGACY then jump expect-no-memquirk
  if v0 == XOCHIP then jump expect-memquirk

: expect-memquirk
  if v5 == 4 begin
    if v6 == 5 begin 
      i := flag-ok
    else
      v1 := 1
    end
  end
  jump memquirk-done

: expect-no-memquirk
  if v5 == 11 begin
    if v6 == 11 begin
      i := flag-ok
    else
      v1 := 1
    end
  end

: memquirk-done
  x := 59
  y := 7
  sprite x y 3
  i := quirks-on
  if v5 == 11 then i := quirks-off
  if v1 == 1 then i := quirks-inconsistent-1
  vD := 42
  vE := 6
  drawText

  # dispQuirk
  # When drawing a sprite to the screen, the interpreter waits for v-blank
  text 1 11 quirks-disp
  i := scratchpad
  load v1
  i := flag-err
  if v0 == CHIP8 begin
    if v1 == ON then i := flag-ok
  end
  if v0 == SCHIP_MODERN begin
    if v1 == NONE then i := flag-ok
  end
  if v0 == SCHIP_LEGACY begin
    if v1 == LORES then i := flag-ok
  end
  if v0 == XOCHIP begin
    if v1 == NONE then i := flag-ok
  end
  x := 59
  y := 12
  sprite x y 3
  i := quirks-off
  if v1 == ON    then i := quirks-on
  if v1 == ERR1  then i := quirks-slow
  if v1 == LORES then i := quirks-lores
  if v1 == HIRES then i := quirks-hires
  if v1 == BOTH  then i := quirks-both
  if v1 == NONE  then i := quirks-none
  vD := 42
  vE := 11
  drawText

  # clipQuirk
  # Sprites wrap to the top of the screen
  text 1 16 quirks-clip
  i := scratchpad
  load v2
  i := flag-err
  if v0 == CHIP8 begin
    if v2 == ON  then i := flag-ok
  end
  if v0 == SCHIP_MODERN begin
    if v2 == BOTH then i := flag-ok
  end
  if v0 == SCHIP_LEGACY begin
    if v2 == BOTH then i := flag-ok
  end
  if v0 == XOCHIP begin
    if v2 == NONE then i := flag-ok
  end
  x := 59
  y := 17
  sprite x y 3
  i := quirks-off
  if v2 == ON    then i := quirks-on
  if v2 == LORES then i := quirks-lores
  if v2 == HIRES then i := quirks-hires
  if v2 == BOTH  then i := quirks-both
  if v2 == NONE  then i := quirks-none
  if v2 == ERR1  then i := quirks-inconsistent-1
  if v2 == ERR2  then i := quirks-inconsistent-2
  if v2 == ERR3  then i := quirks-inconsistent-3
  vD := 42
  vE := 16
  drawText

  # shiftQuirk
  # When shifting a register, the interpreter always shifts register X into
  # register X (instead of shifting register Y into register X)
  text 1 21 quirks-shift
  v5 := 0
  v6 := 8
  v7 := 0
  v8 := 32
  v5 <<= v6
  v7 >>= v8
  i := scratchpad
  load v0
  i := flag-err
  if v0 == CHIP8 begin
    if v5 != 0 then i := flag-ok
  end
  if v0 == SCHIP_MODERN begin
    if v5 == 0 then i := flag-ok
  end
  if v0 == SCHIP_LEGACY begin
    if v5 == 0 then i := flag-ok
  end
  if v0 == XOCHIP begin
    if v5 != 0 then i := flag-ok
  end
  x := 59
  y := 22
  sprite x y 3
  i := quirks-off
  if v5 == 0 then i := quirks-on
  if v5 != v7 then i := quirks-inconsistent-1
  vD := 42
  vE := 21
  drawText

  # jumpQuirk
  # When using `jump0` (BNNN) the interpreter doesn't jump to NNN + v0 but to
  # NNN + vX where X is the highest nibble of NNN
  text 1 26 quirks-jump
  v0 := 0x98
  vE := 0x9C
  jump0 0xE00      # This jumps to one of two routines defined in index.8o (for
: quirks-resume    # reasons of having to put them in precisely the right spot)
  i := scratchpad
  load v0
  i := flag-err
  if v0 == CHIP8 begin
    if v5 == 0 then i := flag-ok
  end
  if v0 == SCHIP_MODERN begin
    if v5 != 0 then i := flag-ok
  end
  if v0 == SCHIP_LEGACY begin
    if v5 != 0 then i := flag-ok
  end
  if v0 == XOCHIP begin
    if v5 == 0 then i := flag-ok
  end
  x := 59
  y := 27
  sprite x y 3
  i := quirks-off
  if v5 == 1 then i := quirks-on
  vD := 42
  vE := 26
  drawText

  v0 := key
  waitKeyRelease
  jump main

:segment data

: quirks-vf
  str "VF RESET" 0
: quirks-mem
  str "MEMORY" 0
: quirks-disp
  str "DISP.WAIT" 0
: quirks-clip
  str "CLIPPING" 0
: quirks-shift
  str "SHIFTING" 0
: quirks-jump
  str "JUMPING" 0

: quirks-on
  str "ON" 0
: quirks-off
  str "OFF" 0
: quirks-slow
  str "SLOW" 0
: quirks-lores
  str "LRES" 0
: quirks-hires
  str "HRES" 0
: quirks-both
  str "BOTH" 0
: quirks-none
  str "NONE" 0
: quirks-inconsistent-1
  str "ERR1" 0
: quirks-inconsistent-2
  str "ERR2" 0
: quirks-inconsistent-3
  str "ERR3" 0

: cursor
  0b11111110
  0b11111110
  0b11111110
  0b11111110
  0b11111110
  0b11111110

:segment code

: get-frames-per-second-chip8
  quirks-show-splash-lores
  i := quirks-values
  load v6
    # v0 := 10
    # v1 := 31
    # v2 := 0
    # v3 := 0
    # v4 := 1
    # v5 := 180
    # v6 := 0
  i := quirks-image
  delay := v5
  loop
    v5 := 30
    loop
      sprite v0 v1 1
      if vF == 0 begin
        v0 := 54
        v6 := delay
        v6 >>= v6
        v6 >>= v6
        v0 -= v6
      end
      v5 -= 1
      if v5 != 0 then
    again
    v2 += v4
    v3 += vF
    vE := delay
  if vE != 0 then again
  return

: get-frames-per-second-schip-xochip
  quirks-show-splash-lores
  i := quirks-values
  load v6
    # v0 := 10
    # v1 := 31
    # v2 := 0
    # v3 := 0
    # v4 := 1
    # v5 := 180
    # v6 := 0
  v5 >>= v5
  i := quirks-image
  delay := v5
  loop
    v5 := 30
    loop
      sprite v0 v1 1
      if vF == 0 begin
        v0 := 32
        v6 := delay
        v6 >>= v6
        v6 >>= v6
        v0 -= v6
      end
      v5 -= 1
      if v5 != 0 then
    again
    v2 += v4
    v3 += vF
    vE := delay
  if vE != 0 then again
  return

: quirks-show-splash-lores
  v0 := 8
  v1 := 0
  v2 := 15
  i := splash-0-0
  loop
    sprite v0 v1 15
    i += v2
    v0 += 8
    if v0 == 56 begin
      v0 := 8
      v1 += 15
    end
    if v1 != 30 then
  again
  return

: get-frames-per-second-hires
  v0 := 16
  v1 := 0
  v2 := 32
  i := splash2x-0-0
  loop
    sprite v0 v1 0
    i += v2
    v0 += 16
    if v0 == 112 begin
      v0 := 16
      v1 += 16
    end
    if v1 != 64 then
  again

  # 11th pixel
  i := quirks-values
  load v6
    # v0 := 10
    # v1 := 31
    # v2 := 0
    # v3 := 0
    # v4 := 1
    # v5 := 180
    # v6 := 0
  v0 += v0
  v1 += v1
  v5 >>= v5
  i := quirks-line
  loop
    sprite v0 v1 2
    v0 += 8
    if v0 != 60 then
  again
  i := quirks-image
  loop
    sprite v0 v1 2
    v0 += 1
    if v0 != 64 then
  again
  delay := v5
  loop
    v5 := 15
    loop
      sprite v0 v1 2
      if vF == 0 begin
        v0 := 108
        v6 := delay
        v6 >>= v6
        v0 -= v6
      end
      v5 -= 1
      if v5 != 0 then
    again
    v2 += v4
    v3 += vF
    vE := delay
  if vE != 0 then again
  return

:segment data

: quirks-values
  10 31 0 0 1 180 0
: quirks-image
  0b10000000
  0b10000000
: quirks-line
  0b11111111
  0b11111111

:include "../../pictures/version.png"
:include "../../pictures/splash.png"
:include "../../pictures/splash2x.png" 16x16

# Jump quirk targets:
:org 0xE98
  # We jump here when using v0 in the `jump0` quirks test
  v5 := 0
  jump quirks-resume
:org 0xE9C
  # We jump here when using vE in the `jump0` quirks test
  v5 := 1
  jump quirks-resume