More code cleanups

main.c

@@ -13,6 +13,7 @@
 #include "system/blitter.h"
 #include "system/copper.h"
 #include "system/system.h"
+#include "system/sprite.h"
 
 #include "screen.h"
 #include "types.h"
@@ -24,8 +25,6 @@ extern struct CIA far ciaa;
 // change to 0 to not render sprites
 #define RENDER_SPRITES (1)
 
-volatile short *dbg = (volatile short *)0x100;
-
 struct ScreenDefinition screenDefinition;
 struct ActiveScreenBufferDetails activeScreenBufferDetails;
 
@@ -38,19 +37,10 @@ struct ActiveScreenBufferDetails activeScreenBufferDetails;
  */
 void *copperlistBitplanePointers[8][2];
 
-#define offsetof(s, m) &((struct s *)0)->m
 uint16_t custom_color = (uint16_t)offsetof(Custom, color);
 uint16_t custom_sprite = (uint16_t)offsetof(Custom, sprpt);
 uint16_t custom_sprite_control = (uint16_t)offsetof(Custom, spr);
 
-#define SPRPOS(x, y) (((y & 0xff) << 8) + ((x & 0x1fe) >> 1))
-#define SPRCTL(x, y, height) ( \
-  ((height & 0xff) << 8) + \
-  ((y & 0x100) >> 6) + \
-  ((height & 0x100) >> 7) + \
-  (x & 1) \
-)
-
 extern uint8_t chip TopazBitplanes[];
 extern uint16_t chip CopperColors[];
 extern uint16_t chip SpriteCopperlist[];
@@ -61,6 +51,8 @@ extern uint8_t chip MaskBitplane[];
 #define TOPAZ_WIDTH_BYTES (TOPAZ_WIDTH_PIXELS / 8)
 #define TOPAZ_WIDTH_WORDS (TOPAZ_WIDTH_PIXELS / 16)
 
+#define BLTSIZE(w, h) (w + (h << 6))
+
 void renderTopaz(void) {
   int plane;
 
@@ -84,7 +76,7 @@ void renderTopaz(void) {
     custom.bltbmod = 0;
     custom.bltcmod = bltcmod;
     custom.bltdmod = bltcmod;
-    custom.bltsize = TOPAZ_WIDTH_WORDS + (256 << 6);
+    custom.bltsize = BLTSIZE(TOPAZ_WIDTH_WORDS, 256);
 
     bltbpt += TOPAZ_WIDTH_BYTES * 256;
 
@@ -92,10 +84,96 @@ void renderTopaz(void) {
   }
 }
 
-int main(void) {
-  uint16_t *copperlist, *currentCopperlist, *currentCopperColors, result, *currentSpriteCopperlist;
+#define COPPERLIST_SIZE (10000)
+
+uint16_t *copperlist;
+
+void buildCopperlist(void) {
   uint32_t spriteDataPointer;
-  int i, x, y, height, plane;
+  uint16_t *currentCopperlist,
+    *currentCopperColors,
+    *currentSpriteCopperlist;
+  int i, j, y;
+  uint16_t spriteSetupRegisters[3];
+
+  copperlist = prepareNewCopperlist(COPPERLIST_SIZE);
+
+  currentCopperlist = addDisplayToCopperlist(
+    copperlist,
+    &screenDefinition,
+    &activeScreenBufferDetails,
+    &copperlistBitplanePointers
+  );
+
+  currentCopperColors = CopperColors;
+  currentSpriteCopperlist = SpriteCopperlist;
+
+  COPPERLIST_MOVE(currentCopperlist, custom_color, 0x3a6);
+  COPPERLIST_MOVE(currentCopperlist, custom_color + 2, 0x000);
+  COPPERLIST_MOVE(currentCopperlist, custom_color + 4, 0xfff);
+
+  if (RENDER_SPRITES) {
+    for (i = 0; i < 8; ++i) {
+      spriteDataPointer = (uint32_t)&SpriteData;
+      spriteDataPointer += ((256 + 2) * 4) * i;
+
+      COPPERLIST_MOVE_POINTER(
+        currentCopperlist,
+        custom_sprite + i * 4,
+        spriteDataPointer
+      );
+    }
+  } else {
+    printf("Skipping render\n");
+    currentCopperlist = setUpEmptySpritesInCopperlist(currentCopperlist);
+  }
+
+  for (y = 0; y < 256; ++y) {
+    if (RENDER_SPRITES) {
+      for (i = 0; i < 8; ++i) {
+        spriteSetupRegisters[0] = custom_color + 32 + (
+          // sprite color group
+          (i / 2) * 4 +
+          // 0 is transparent
+          1 +
+          i % 2
+        ) * 2;
+        spriteSetupRegisters[1] = custom_sprite_control + i * 8;
+        spriteSetupRegisters[2] = custom_sprite_control + i * 8 + 2;
+
+        for (j = 0; j < 3; ++j) {
+          COPPERLIST_MOVE(
+            currentCopperlist,
+            spriteSetupRegisters[j],
+            *(currentSpriteCopperlist++)
+          );
+        }
+      }
+    } else {
+      printf("Skipping render\n");
+    }
+
+    for (i = 3; i < 8; ++i) {
+      COPPERLIST_MOVE(
+        currentCopperlist,
+        custom_color + (i * 2),
+        *(currentCopperColors++)
+      );
+    }
+
+    COPPERLIST_WAIT(
+      currentCopperlist,
+      (31 + (256 / 4)),
+      (44 + y),
+      0xFFFE
+    );
+  }
+
+  endCopperlist(currentCopperlist);
+}
+
+int main(void) {
+  int i;
 
   struct BunRenderer bunRenderer;
 
@@ -135,79 +213,8 @@ int main(void) {
     &activeScreenBufferDetails
   );
 
-  // blitter copy the first bitplane row down to the second
+  buildCopperlist();
 
-  copperlist = prepareNewCopperlist(10000);
-
-  currentCopperlist = addDisplayToCopperlist(
-    copperlist,
-    &screenDefinition,
-    &activeScreenBufferDetails,
-    &copperlistBitplanePointers
-  );
-
-  currentCopperColors = CopperColors;
-  currentSpriteCopperlist = SpriteCopperlist;
-
-  *(currentCopperlist++) = custom_color + 2;
-  *(currentCopperlist++) = 0x000;
-
-  *(currentCopperlist++) = custom_color + 4;
-  *(currentCopperlist++) = 0xfff;
-
-  if (RENDER_SPRITES) {
-    for (i = 0; i < 8; ++i) {
-      spriteDataPointer = (uint32_t)&SpriteData;
-      spriteDataPointer += ((256 + 2) * 4) * i;
-
-      *(currentCopperlist++) = custom_sprite + i * 4;
-      *(currentCopperlist++) = (spriteDataPointer >> 16);
-
-      *(currentCopperlist++) = custom_sprite + 2 + i * 4;
-      *(currentCopperlist++) = (spriteDataPointer & 0xffff);
-    }
-  } else {
-    printf("Skipping render\n");
-    currentCopperlist = setUpEmptySpritesInCopperlist(currentCopperlist);
-  }
-
-  *(currentCopperlist++) = custom_color;
-  *(currentCopperlist++) = 0x3a6;
-
-  for (y = 0; y < 256; ++y) {
-    if (RENDER_SPRITES) {
-      for (i = 0; i < 8; ++i) {
-        // set sprite color
-        *(currentCopperlist++) = custom_color + 32 + (
-          // sprite color group
-          (i / 2) * 4 +
-          // 0 is transparent
-          1 +
-          i % 2
-        ) * 2;
-        *(currentCopperlist++) = *(currentSpriteCopperlist++);
-
-        // set sprite position
-        *(currentCopperlist++) = custom_sprite_control + i * 8;
-        *(currentCopperlist++) = *(currentSpriteCopperlist++);
-
-        *(currentCopperlist++) = custom_sprite_control + i * 8 + 2;
-        *(currentCopperlist++) = *(currentSpriteCopperlist++);
-      }
-    } else {
-      printf("Skipping render\n");
-    }
-
-    for (i = 3; i < 8; ++i) {
-      *(currentCopperlist++) = custom_color + (i * 2);
-      *(currentCopperlist++) = *(currentCopperColors++);
-    }
-
-    *(currentCopperlist++) = 1 + ((31 + (256 / 4)) << 1) + ((44 + y) << 8);
-    *(currentCopperlist++) = 0xFFFE;
-  }
-
-  endCopperlist(currentCopperlist);
 
   /*
   copperlist debugging
@@ -248,7 +255,7 @@ int main(void) {
 
     if ((ciaa.ciapra >> 6) != 3) break;
 
-    //i++;
+    i++;
     i %= FRAMES_FOR_SCREEN;
   }
 

smakefile

@@ -8,8 +8,8 @@ all: main
 .s.o:
 	genam -l $*.s
 
-system.lib: system/system.o system/copper.o system/blitter.o
-	sc objectlibrary=system.lib system/system.o system/copper.o system/blitter.o
+system.lib: system/system.o system/copper.o system/blitter.o system/debug.o
+	sc objectlibrary=system.lib system/system.o system/copper.o system/blitter.o system/debug.o
 
 main: $(MAIN_OBJS)
 	sc link to main math=standard $(MAIN_OBJS)

system/copper.h

@@ -3,6 +3,28 @@
 
 #include "../types.h"
 
+/**
+* Sets register to value over two Copper words.
+* Side-effect: Advances ptr by 4.
+*/
+#define COPPERLIST_MOVE(ptr,register,value) \
+  *(ptr++) = register; \
+  *(ptr++) = value;
+
+#define COPPERLIST_WAIT(ptr,x,y,mask) \
+  *(ptr++) = 1 + (x << 1) + (y << 8); \
+  *(ptr++) = mask;
+
+/**
+* Sets high/low registers to pointer value over four Copper words.
+* Side-effect: Advances ptr by 8.
+*/
+#define COPPERLIST_MOVE_POINTER(ptr,register,pointerValue) \
+  *(ptr++) = register; \
+  *(ptr++) = (pointerValue >> 16); \
+  *(ptr++) = register + 2; \
+  *(ptr++) = (pointerValue & 0xffff);
+
 uint16_t * prepareNewCopperlist(uint16_t size_b);
 void setCopperlist(uint16_t *copperlist);
 void freeCopperlist(uint16_t *copperlist);

system/debug.c

@@ -0,0 +1,11 @@
+#include "debug.h"
+
+volatile short *dbg = (volatile short *)0x100;
+
+/**
+* Create a two-word write watch in the UAE debugger at memory location 0x100
+* and call this function.
+*/
+void triggerUAEDebugger() {
+  *(dbg) = 0;
+}

system/debug.h

@@ -0,0 +1,6 @@
+#ifndef __SYSTEM_DEBUG__
+#define __SYSTEM_DEBUG__
+
+void triggerUAEDebugger(void);
+
+#endif

system/sprite.h

@@ -0,0 +1,7 @@
+#define SPRPOS(x, y) (((y & 0xff) << 8) + ((x & 0x1fe) >> 1))
+#define SPRCTL(x, y, height) ( \
+  ((height & 0xff) << 8) + \
+  ((y & 0x100) >> 6) + \
+  ((height & 0x100) >> 7) + \
+  (x & 1) \
+)

types.h

@@ -3,6 +3,14 @@
 
 #include <exec/types.h>
 
+/**
+* Get the offset from the beginning of a struct. Useful for building
+* references to custom chip registers dynamically for copperlists.
+*
+* @see Custom
+*/
+#define offsetof(s, m) &((struct s *)0)->m
+
 typedef unsigned short color_t;
 typedef unsigned long uint32_t;
 typedef unsigned short uint16_t;