From de5588751dfb3764949c413db7896dbc7126128b Mon Sep 17 00:00:00 2001
From: Wei-ju Wu <weiju.wu@gmail.com>
Date: Tue, 29 Nov 2016 15:40:07 -0800
Subject: [PATCH] added sound effects playing

---
 hardware/Makefile     |   7 ++-
 hardware/common.c     |  10 ++--
 hardware/laser.raw8   | Bin 0 -> 25074 bytes
 hardware/playfield1.c |   6 ++-
 hardware/soundfx.c    | 119 ++++++++++++++++++++++++++++++++++++++++++
 utils/png2image.py    |   2 +
 6 files changed, 135 insertions(+), 9 deletions(-)
 create mode 100644 hardware/laser.raw8
 create mode 100644 hardware/soundfx.c

diff --git a/hardware/Makefile b/hardware/Makefile
index 693f689..21a7d05 100644
--- a/hardware/Makefile
+++ b/hardware/Makefile
@@ -1,10 +1,10 @@
 CC=vc +kick13
 CFLAGS=-c99 -I$(NDK_INC) -DDEBUG -O2
 
-all: startup sprites playfield1 scoopex1
+all: startup sprites playfield1 scoopex1 soundfx
 
 clean:
-	rm -f *.o startup sprites playfield1 scoopex2
+	rm -f *.o startup sprites playfield1 scoopex2 soundfx
 
 startup: startup.o common.o
 	$(CC) $(CFLAGS) $^ -lamiga -lauto -o $@
@@ -18,3 +18,6 @@ playfield1: playfield1.o common.o
 scoopex1: scoopex1.c
 	$(CC) $(CFLAGS) $^ -lamiga -lauto -o $@
 
+soundfx: soundfx.o common.o
+	$(CC) $(CFLAGS) $^ -lamiga -lauto -o $@
+
diff --git a/hardware/common.c b/hardware/common.c
index 34b51cb..2dc0b06 100644
--- a/hardware/common.c
+++ b/hardware/common.c
@@ -17,7 +17,7 @@ static ULONG oldresolution;
 
 struct ExecBase **exec_base_ptr = (struct ExecBase **) (4L);
 
-static void ApplySpriteFix(void)
+static void apply_sprite_fix(void)
 {
     if (wbscreen = LockPubScreen(WB_SCREEN_NAME)) {
         struct TagItem video_control_tags[] = {
@@ -36,7 +36,7 @@ static void ApplySpriteFix(void)
     }
 }
 
-static void UnapplySpriteFix(void)
+static void unapply_sprite_fix(void)
 {
     if (wbscreen) {
         struct TagItem video_control_tags[] = {
@@ -60,11 +60,9 @@ BOOL init_display(void)
 
     // Kickstart > 3.0: fix sprite bug
     if (lib_version >= 39) {
-        ApplySpriteFix();
+        apply_sprite_fix();
         is_pal = (((struct GfxBase *) GfxBase)->DisplayFlags & PAL) == PAL;
     } else {
-        // Note: FS-UAE reports 0 this, so essentially, there is no information
-        // for 1.x
         int vblank_freq = (*exec_base_ptr)->VBlankFrequency;
         printf("Gfx Lib version: %u, Vertical Blank Frequency: %d\n", lib_version, vblank_freq);
         is_pal = vblank_freq == VFREQ_PAL;
@@ -76,7 +74,7 @@ void reset_display(void)
 {
     struct View *current_view = ((struct GfxBase *) GfxBase)->ActiView;
     UWORD lib_version = GfxBase->LibNode.lib_Version;
-    if (lib_version >= 39) UnapplySpriteFix();
+    if (lib_version >= 39) unapply_sprite_fix();
     LoadView(current_view);
     WaitTOF();
     WaitTOF();
diff --git a/hardware/laser.raw8 b/hardware/laser.raw8
new file mode 100644
index 0000000000000000000000000000000000000000..330ba4f43689f8eddca0661d2998d16cf6a7b8b6
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diff --git a/hardware/playfield1.c b/hardware/playfield1.c
index 77d52fd..24fec08 100644
--- a/hardware/playfield1.c
+++ b/hardware/playfield1.c
@@ -5,7 +5,7 @@
 #include "common.h"
 
 #define NUM_BITPLANES 5
-#define INTERLEAVED
+//#define INTERLEAVED
 
 #ifdef USE_PAL
 
@@ -57,6 +57,7 @@ static UWORD __chip coplist[] = {
     COP_MOVE(BPL4PTL, 0),
     COP_MOVE(BPL5PTH, 0),
     COP_MOVE(BPL5PTL, 0),
+    COP_MOVE(COLOR00, 0),
     COP_WAIT_END,
     COP_WAIT_END
 };
@@ -87,6 +88,7 @@ int main(int argc, char **argv)
 
     custom.diwstrt = DIWSTRT_VALUE;
     custom.diwstop = DIWSTOP_VALUE;
+    // should be done in copper list, because workbench copper list could overwrite it
     for (int i = 0; i < NUM_COLORS; i++) {
         custom.color[i] = image_colors[i];
     }
@@ -95,6 +97,7 @@ int main(int argc, char **argv)
 #ifdef INTERLEAVED
     // in interleaved mode, each plane's *rows* are organized
     // consecutively one after another
+    printf("interleaved\n");
     for (int i = 0; i < NUM_BITPLANES; i++) {
         ULONG addr = (ULONG) &(image_data[i * 20]);
         coplist[i * 4 + 1] = (addr >> 16) & 0xffff;
@@ -103,6 +106,7 @@ int main(int argc, char **argv)
 #else
     // in non-interleaved mode, each plane's data is placed
     // consecutively one after another
+    printf("non-interleaved\n");
     for (int i = 0; i < NUM_BITPLANES; i++) {
         ULONG addr = (ULONG) &(image_data[i * 20 * NUM_RASTER_LINES]);
         coplist[i * 4 + 1] = (addr >> 16) & 0xffff;
diff --git a/hardware/soundfx.c b/hardware/soundfx.c
new file mode 100644
index 0000000..a9de82f
--- /dev/null
+++ b/hardware/soundfx.c
@@ -0,0 +1,119 @@
+#include <hardware/custom.h>
+#include <hardware/dmabits.h>
+#include <clib/exec_protos.h>
+#include <stdio.h>
+
+#include "common.h"
+
+/*
+ * This is essentially the code for startup.asm from
+ * "Amiga Demo Coders Reference Manual" translated to C.
+ *
+ * This allows a program which operates directly on the hardware
+ * to play nice with the operating system and ensure a clean exit
+ * to Workbench.
+ * A great starting point to use as a template for demos and games.
+ */
+extern struct Custom custom;
+char VERSION_STRING[] = "\0$VER: startup 1.0 (21.09.2016)\0";
+
+static UWORD __chip coplist_pal[] = {
+    COP_MOVE(BPLCON0, BPLCON0_COMPOSITE_COLOR),
+    COP_MOVE(COLOR00, 0x000),
+    0x8107, 0xfffe,            // wait for $8107,$fffe
+    COP_MOVE(COLOR00, 0xf00),
+    0xd607, 0xfffe,            // wait for $d607,$fffe
+    COP_MOVE(COLOR00, 0xff0),
+    COP_WAIT_END,
+    COP_WAIT_END
+};
+static UWORD __chip coplist_ntsc[] = {
+    COP_MOVE(BPLCON0, BPLCON0_COMPOSITE_COLOR),
+    COP_MOVE(COLOR00, 0x000),
+    0x6e07, 0xfffe,           // wait for $6e07,$fffe
+    COP_MOVE(COLOR00, 0xf00),
+    0xb007, 0xfffe,           // wait for $b007,$fffe
+    COP_MOVE(COLOR00, 0xff0),
+    COP_WAIT_END,
+    COP_WAIT_END
+};
+
+// Assuming a 14k sample rate
+#define SOUND_DATA_SIZE (25074)
+// 0-64
+#define MAX_VOLUME (64)
+#define SAMPLE_PERIOD (256)
+
+static UBYTE __chip sound_data[SOUND_DATA_SIZE];
+
+void start_channel(int channel)
+{
+    int channel_bits = 0;
+    switch (channel) {
+    case 0:
+        channel_bits = DMAF_AUD0;
+        break;
+    case 1:
+        channel_bits = DMAF_AUD1;
+        break;
+    case 2:
+        channel_bits = DMAF_AUD2;
+        break;
+    case 3:
+        channel_bits = DMAF_AUD3;
+        break;
+    default:
+        break;
+    }
+    custom.dmacon = (DMAF_SETCLR | channel_bits | DMAF_MASTER);
+}
+
+void stop_channel(int channel)
+{
+    int channel_bits = 0;
+    switch (channel) {
+    case 0:
+        channel_bits = DMAF_AUD0;
+        break;
+    case 1:
+        channel_bits = DMAF_AUD1;
+        break;
+    case 2:
+        channel_bits = DMAF_AUD2;
+        break;
+    case 3:
+        channel_bits = DMAF_AUD3;
+        break;
+    default:
+        break;
+    }
+    custom.dmacon = channel_bits;
+}
+
+int main(int argc, char **argv)
+{
+    struct Task *current_task = FindTask(NULL);
+    BYTE old_prio = SetTaskPri(current_task, TASK_PRIORITY);
+    BOOL is_pal = init_display();
+    FILE *fp = fopen("laser.raw8", "rb");
+    int bytes_read = fread(sound_data, sizeof(UBYTE), SOUND_DATA_SIZE, fp);
+    custom.aud[0].ac_ptr = (UWORD *) sound_data;
+    custom.aud[0].ac_len = SOUND_DATA_SIZE / 2;
+    custom.aud[0].ac_vol = MAX_VOLUME;
+    custom.aud[0].ac_per = SAMPLE_PERIOD;
+    start_channel(0);
+
+
+    custom.cop1lc = is_pal ? (ULONG) coplist_pal : (ULONG) coplist_ntsc;
+
+    // strobe the COPJMP1 register to make sure the system is using
+    // copper list 1 (I found out that leaving this out can lead to
+    // strange effects on an emulated 4000 system)
+    custom.copjmp1 = 1;
+
+    waitmouse();
+    stop_channel(0);
+
+    reset_display();
+    return 0;
+}
diff --git a/utils/png2image.py b/utils/png2image.py
index 4072de5..cbe0e08 100755
--- a/utils/png2image.py
+++ b/utils/png2image.py
@@ -75,6 +75,8 @@ def write_amiga_image(im, outfile, img_name, use_intuition, interleaved, verbose
     # colors is a list of 3-integer lists ([[r1, g1, b1], ...])
     colors = [i for i in chunks([b for b in im.palette.tobytes()], 3)]
     depth = round(math.log(len(colors), 2))
+    if depth == 0:
+        raise Exception("images with only 1 color can't be handled")
     # fill the missing colors with black entries
     num_missing_colors = 2 ** depth - len(colors)
     colors += [[0, 0, 0]] * num_missing_colors