added cx16 version of bdmusic, needs ADSR though

2024-11-22 15:33:02 +00:00 · 2022-06-30 21:33:48 +02:00 · 2022-06-30 21:33:48 +02:00 · 2ad4fdbbb9
commit 2ad4fdbbb9
parent 97cb0cbd08
1 changed files with 127 additions and 0 deletions
--- a/examples/cx16/bdmusic.p8
+++ b/examples/cx16/bdmusic.p8
@ -0,0 +1,127 @@
+%import textio
+%import syslib
+%import floats
+
+main {
+
+sub start() {
+
+    txt.print("will play the music from boulderdash,\nmade in 1984 by peter liepa.\npress enter to start: ")
+    void c64.CHRIN()
+    txt.clear_screen()
+
+    repeat {
+        uword note
+        for note in notes {
+            ubyte note1 = lsb(note)
+            ubyte note2 = msb(note)
+            uword freqR = freq(note1)
+            uword freqL = freq(note2)
+            cx16.vpoke(1, $F9C0, lsb(freqR))
+            cx16.vpoke(1, $F9C1, msb(freqR))
+            cx16.vpoke(1, $F9C2, %10111111)     ; left, max volume
+            cx16.vpoke(1, $F9C3, %10000000)     ; triangle
+            cx16.vpoke(1, $F9C4, lsb(freqL))
+            cx16.vpoke(1, $F9C5, msb(freqL))
+            cx16.vpoke(1, $F9C6, %01111111)     ; right, max volume
+            cx16.vpoke(1, $F9C7, %10000000)     ; triangle
+
+            ; TODO ADSR of some kind?
+
+            print_notes(note1, note2)
+            sys.wait(10)
+        }
+    }
+}
+
+sub freq(ubyte note) -> uword {
+    float fword = freqs_hz[note-10] / (48828.125 / 131072.0)       ; formula from the Vera PSG docs
+    return fword as uword
+}
+
+sub print_notes(ubyte n1, ubyte n2) {
+    txt.nl()
+    txt.plot(n1, txt.DEFAULT_HEIGHT-1)
+    txt.color(7)
+    txt.chrout('Q')
+    txt.plot(n2, txt.DEFAULT_HEIGHT-1)
+    txt.color(4)
+    txt.chrout('Q')
+}
+
+
+    ; details about the boulderdash music can be found here:
+    ; https://www.elmerproductions.com/sp/peterb/sounds.html#Theme%20tune
+
+    uword[] notes = [
+        $1622, $1d26, $2229, $252e, $1424, $1f27, $2029, $2730,
+        $122a, $122c, $1e2e, $1231, $202c, $3337, $212d, $3135,
+        $1622, $162e, $161d, $1624, $1420, $1430, $1424, $1420,
+        $1622, $162e, $161d, $1624, $1e2a, $1e3a, $1e2e, $1e2a,
+        $142c, $142c, $141b, $1422, $1c28, $1c38, $1c2c, $1c28,
+        $111d, $292d, $111f, $292e, $0f27, $0f27, $1633, $1627,
+        $162e, $162e, $162e, $162e, $222e, $222e, $162e, $162e,
+        $142e, $142e, $142e, $142e, $202e, $202e, $142e, $142e,
+        $162e, $322e, $162e, $332e, $222e, $322e, $162e, $332e,
+        $142e, $322e, $142e, $332e, $202c, $302c, $142c, $312c,
+        $162e, $163a, $162e, $3538, $222e, $2237, $162e, $3135,
+        $142c, $1438, $142c, $1438, $202c, $2033, $142c, $1438,
+        $162e, $322e, $162e, $332e, $222e, $322e, $162e, $332e,
+        $142e, $322e, $142e, $332e, $202c, $302c, $142c, $312c,
+        $2e32, $292e, $2629, $2226, $2c30, $272c, $2427, $1420,
+        $3532, $322e, $2e29, $2926, $2730, $242c, $2027, $1420
+    ]
+
+    float[] freqs_hz = [
+            ; first 10 are unused so should index by i-10
+         44.6,
+         47.4,
+         50.4,
+         53.4,
+         56.6,
+         59.6,
+         63.5,
+         67.1,
+         71.3,
+         75.5,
+         80.0,
+         84.7,
+         89.3,
+         94.9,
+        100.7,
+        106.8,
+        113.2,
+        119.3,
+        127.1,
+        134.1,
+        142.7,
+        151.0,
+        160.0,
+        169.5,
+        178.5,
+        189.7,
+        201.4,
+        213.6,
+        226.3,
+        238.5,
+        254.1,
+        268.3,
+        285.3,
+        301.9,
+        320.0,
+        339.0,
+        357.0,
+        379.5,
+        402.9,
+        427.3,
+        452.6,
+        477.0,
+        508.2,
+        536.5,
+        570.7,
+        603.8,
+        639.9,
+        678.0,
+        714.1
+    ]
+}