Need genam too

32x50_bun.c

@@ -0,0 +1,90 @@
+/**
+* What do we need
+* * [ ] screen setup
+*/
+
+#include <hardware/custom.h>
+#include <hardware/cia.h>
+
+#include <clib/graphics_protos.h>
+
+#include "system/system.h"
+#include "system/copper.h"
+#include "system/blitter.h"
+
+#include "screen.h"
+
+extern struct Custom far custom;
+extern struct CIA far ciaa;
+
+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);
+
+extern unsigned char chip coolbun[];
+
+int main(void) {
+  struct ScreenDefinition screenDefinition;
+  struct ActiveScreenBufferDetails activeScreenBufferDetails;
+  uint16_t *copperlist, *currentCopperlist;
+  void *copperlistBitplanePointers[8][2];
+  int i, plane;
+
+  allocateDoubleBufferedScreenMemory(
+    &screenDefinition,
+    &activeScreenBufferDetails,
+    320,
+    256,
+    2
+  );
+
+  copperlist = prepareNewCopperlist(300);
+
+  currentCopperlist = addDisplayToCopperlist(
+    copperlist,
+    &screenDefinition,
+    &activeScreenBufferDetails,
+    &copperlistBitplanePointers
+  );
+
+  COPPERLIST_MOVE(currentCopperlist, custom_color, 0x3a6);
+  COPPERLIST_MOVE(currentCopperlist, custom_color + 2, 0x000);
+  COPPERLIST_MOVE(currentCopperlist, custom_color + 4, 0xfff);
+  currentCopperlist = setUpEmptySpritesInCopperlist(currentCopperlist);
+
+  endCopperlist(currentCopperlist);
+
+  takeOverSystem();
+
+  setCopperlist(copperlist);
+  setUpDisplay((uint32_t)screenDefinition.bitplanes);
+
+  // Render a bun at 32x50
+
+  for (plane = 0; plane < 2; ++plane) {
+    custom.bltcon0 = BLTCON0(0xf0, 1, 0, 0, 1, 0);
+    custom.bltcon1 = BLTCON1(BLITTER_ASCENDING, 0);
+
+    custom.bltapt = coolbun + (plane * 4 * 32);
+    custom.bltdpt = activeScreenBufferDetails.planes[plane] + (50 * 320 / 8) + 32 / 8;
+    custom.bltafwm = 0xffff;
+    custom.bltalwm = 0xffff;
+
+    custom.bltamod = 0;
+    custom.bltdmod = 40 - 4;
+
+    custom.bltsize = 2 + (32 << 6);
+
+    WaitBlit();
+  }
+
+  while (1) {
+    if ((ciaa.ciapra >> 6) != 3) break;
+  }
+
+  giveBackSystem();
+
+  freeCopperlist(copperlist);
+
+  teardownScreen(&screenDefinition);
+}

33x50_bun.c

@@ -0,0 +1,127 @@
+/**
+* What do we need
+* * [ ] screen setup
+*/
+
+#include <hardware/custom.h>
+#include <hardware/cia.h>
+
+#include <clib/graphics_protos.h>
+
+#include "system/system.h"
+#include "system/copper.h"
+#include "system/blitter.h"
+
+#include "screen.h"
+
+extern struct Custom far custom;
+extern struct CIA far ciaa;
+
+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);
+
+extern unsigned char chip coolbun[];
+
+int main(void) {
+  struct ScreenDefinition screenDefinition;
+  struct ActiveScreenBufferDetails activeScreenBufferDetails;
+  uint16_t *copperlist, *currentCopperlist;
+  void *copperlistBitplanePointers[8][2];
+  int i, plane, x, y, dirX, dirY, shift, byteX;
+
+  allocateDoubleBufferedScreenMemory(
+    &screenDefinition,
+    &activeScreenBufferDetails,
+    320,
+    256,
+    2
+  );
+
+  copperlist = prepareNewCopperlist(300);
+
+  currentCopperlist = addDisplayToCopperlist(
+    copperlist,
+    &screenDefinition,
+    &activeScreenBufferDetails,
+    &copperlistBitplanePointers
+  );
+
+  COPPERLIST_MOVE(currentCopperlist, custom_color, 0x3a6);
+  COPPERLIST_MOVE(currentCopperlist, custom_color + 2, 0x000);
+  COPPERLIST_MOVE(currentCopperlist, custom_color + 4, 0xfff);
+  currentCopperlist = setUpEmptySpritesInCopperlist(currentCopperlist);
+
+  endCopperlist(currentCopperlist);
+
+  takeOverSystem();
+
+  setCopperlist(copperlist);
+  setUpDisplay((uint32_t)screenDefinition.bitplanes);
+
+  // Render a bun at 32x50
+
+  x = 32;
+  y = 50;
+  dirX = 1;
+  dirY = 1;
+
+  while (1) {
+    WaitTOF();
+
+    swapCurrentScreenBuffer(&screenDefinition, &activeScreenBufferDetails);
+
+    shift = x & 15;
+    byteX = (x >> 4 * 2);
+
+    for (plane = 0; plane < 2; ++plane) {
+      custom.bltcon0 = BLTCON0(0xf0, 1, 0, 0, 1, shift);
+      custom.bltcon1 = BLTCON1(BLITTER_ASCENDING, 0);
+
+      custom.bltapt = coolbun + (plane * 4 * 32);
+      custom.bltdpt = activeScreenBufferDetails.planes[plane] + (y * 320 / 8) + byteX;
+      custom.bltafwm = 0xffff;
+
+      if (shift == 0) {
+        custom.bltalwm = 0xffff;;
+      } else {
+        custom.bltalwm = 0x0000;
+      }
+
+      custom.bltamod = shift ? -2 : 0;
+      custom.bltdmod = 40 - (shift ? 6 : 4);
+
+      custom.bltsize = (shift ? 3 : 2) + (32 << 6);
+
+      WaitBlit();
+    }
+
+    x += dirX;
+    if (x == 320 - 32) {
+      x -= 1;
+      dirX = -dirX;
+    }
+    if (x < 0) {
+      x = 0;
+      dirX = -dirX;
+    }
+
+    y += dirY;
+    if (y == 256 - 32) {
+      y -= 1;
+      dirY = -dirY;
+    }
+    if (y > 0) {
+      y = 0;
+      dirY -= dirY;
+    }
+
+    if ((ciaa.ciapra >> 6) != 3) break;
+  }
+
+  giveBackSystem();
+
+  freeCopperlist(copperlist);
+
+  teardownScreen(&screenDefinition);
+}

NOTES.md

@@ -1 +0,0 @@
-* [ ] Move bun calculation to separate file for CuTest and vamos

README.md

@@ -0,0 +1,50 @@
+## Cool Bun Demo
+
+![demo](./demo.gif)
+
+Built for [The Obligatory Amiga Blitter Video](https://makertube.net/w/eV545ku522sRq8CTcxDuFZ).
+
+Uses a bunch of C and Assembler code to drive the blitter, sprites, and copper
+to display high color Topaz art overtop of flying cool bun logos.
+
+## Running
+
+Click the mouse to escape any demo.
+
+* `main`: Main demo
+* `32x50`, `33x50`, `left_side`, `right_side`: Rendering Cool Bun in various
+  locations on screen.
+* `any_position`: Cool Bun flies around like a DVD player pause screen.
+* `keyboard_interrupt`: Tests using `input.device` to access the keyboard.
+* `blitter_speed_test`: Get the speed of blitter vs. CPU memory operations
+* `bun_test`: Run some unit tests (yes, really!)
+
+This will get 50 fps on an 020, and 25 or lower on an 68EC020 and below.
+
+## Building
+
+### Vamos
+
+You'll want [Vamos](https://github.com/cnvogelg/amitools/blob/master/docs/vamos.md),
+and [SAS/C](https://www.amigaclub.be/blog/steffest/2/amiga-c%20compilers)
+& [GenAm from DevPac](https://archive.org/details/Devpac_v3.14_1994-12-16_HiSoft)
+on Vamos's path:
+
+```
+# main
+ruby ./image_converter.rb && touch images.s && vamos -- smake
+
+# any others
+vamos -- smake <other>
+```
+
+The image converter requires Ruby 3.2.4 and RMagick installed.
+
+## Performance
+
+The best way I can think of to make this way faster is for a script in
+Ruby or Python to calculate every blitter register for every frame of data
+for bun renders and clears, store that in a list of words, and rip through
+those lists in Assembler, shotgunning the values directly into the registers
+without the C code needing to track bun positions and bun clears. That's a
+project for another day.

any_position.c

@@ -0,0 +1,144 @@
+/**
+* What do we need
+* * [ ] screen setup
+*/
+
+#include <hardware/custom.h>
+#include <hardware/cia.h>
+
+#include <clib/graphics_protos.h>
+
+#include "system/system.h"
+#include "system/copper.h"
+#include "system/blitter.h"
+
+#include "screen.h"
+
+extern struct Custom far custom;
+extern struct CIA far ciaa;
+
+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);
+
+extern unsigned char chip coolbun[];
+
+int main(void) {
+  struct ScreenDefinition screenDefinition;
+  struct ActiveScreenBufferDetails activeScreenBufferDetails;
+  uint16_t *copperlist, *currentCopperlist;
+  void *copperlistBitplanePointers[8][2];
+  int i, plane, x, y, dirX, dirY, shift, byteX, clearY;
+
+  allocateDoubleBufferedScreenMemory(
+    &screenDefinition,
+    &activeScreenBufferDetails,
+    320,
+    256,
+    2
+  );
+
+  copperlist = prepareNewCopperlist(300);
+
+  currentCopperlist = addDisplayToCopperlist(
+    copperlist,
+    &screenDefinition,
+    &activeScreenBufferDetails,
+    &copperlistBitplanePointers
+  );
+
+  COPPERLIST_MOVE(currentCopperlist, custom_color, 0x3a6);
+  COPPERLIST_MOVE(currentCopperlist, custom_color + 2, 0x000);
+  COPPERLIST_MOVE(currentCopperlist, custom_color + 4, 0xfff);
+  currentCopperlist = setUpEmptySpritesInCopperlist(currentCopperlist);
+
+  endCopperlist(currentCopperlist);
+
+  takeOverSystem();
+
+  setCopperlist(copperlist);
+  setUpDisplay((uint32_t)screenDefinition.bitplanes);
+
+  // Render a bun at 32x50
+
+  x = 32;
+  y = 50;
+  dirX = 1;
+  dirY = 1;
+
+  while (1) {
+    WaitTOF();
+
+    swapCurrentScreenBuffer(&screenDefinition, &activeScreenBufferDetails);
+
+    shift = x & 15;
+    byteX = ((x >> 4) * 2);
+    clearY = y - 4;
+    if (clearY < 0) clearY = 0;
+    if (clearY + 40 > 255) clearY = 255 - 40;
+
+    for (plane = 0; plane < 2; ++plane) {
+      custom.bltcon0 = BLTCON0(0xc0, 0, 0, 0, 1, 0);
+      custom.bltcon1 = 0;
+
+      custom.bltadat = 0x0000;
+      custom.bltdpt = activeScreenBufferDetails.planes[plane] + (clearY * 320 / 8);
+      custom.bltafwm = 0xffff;
+      custom.bltalwm = 0xffff;
+      custom.bltsize = BLTSIZE(20, 40);
+      custom.bltdmod = 0;
+
+      WaitBlit();
+    }
+
+    for (plane = 0; plane < 2; ++plane) {
+      custom.bltcon0 = BLTCON0(0xf0, 1, 0, 0, 1, shift);
+      custom.bltcon1 = BLTCON1(BLITTER_ASCENDING, 0);
+
+      custom.bltapt = coolbun + (plane * 4 * 32);
+      custom.bltdpt = activeScreenBufferDetails.planes[plane] + (y * 320 / 8) + byteX;
+      custom.bltafwm = 0xffff;
+
+      if (shift == 0) {
+        custom.bltalwm = 0xffff;;
+      } else {
+        custom.bltalwm = 0x0000;
+      }
+
+      custom.bltamod = shift ? -2 : 0;
+      custom.bltdmod = 40 - (shift ? 6 : 4);
+
+      custom.bltsize = (shift ? 3 : 2) + (32 << 6);
+
+      WaitBlit();
+    }
+
+    x += dirX;
+    if (x == 320 - 32) {
+      x -= 1;
+      dirX = -dirX;
+    }
+    if (x < 0) {
+      x = 0;
+      dirX = -dirX;
+    }
+
+    y += dirY;
+    if (y == 256 - 32) {
+      y -= 1;
+      dirY = -dirY;
+    }
+    if (y < 0) {
+      y = 0;
+      dirY = -dirY;
+    }
+
+    if ((ciaa.ciapra >> 6) != 3) break;
+  }
+
+  giveBackSystem();
+
+  freeCopperlist(copperlist);
+
+  teardownScreen(&screenDefinition);
+}

basics.s

@@ -1,172 +0,0 @@
-  XREF _custom
-
-; write this from scratch and get it working
-; then plug it into C
-FUNC_CNT SET -30
-FUNCDEF MACRO
-_LVO\1 EQU FUNC_CNT
-FUNC_CNT SET FUNC_CNT-6
-  ENDM
-
-  INCDIR "include_i_39:"
-  INCDIR "extra_lvos_39:"
-  INCLUDE "exec/exec_lib.i"
-  INCLUDE "exec/types.i"
-  INCLUDE "exec/execbase.i"
-  INCLUDE "exec/libraries.i" # get the CALLLIB macro
-  INCLUDE "graphics/gfxbase.i"
-  INCLUDE "graphics_lvo.i"
-  INCLUDE "hardware/custom.i"
-  INCLUDE "hardware/dmabits.i"
-
-START:
-  BSR _takeOverSystem
-  BSR _giveBackSystem
-  MOVE.L #0,D0
-  RTS
-
-OpenGraphicsLibrary MACRO
-    LEA GraphicsLibrary,A1
-    MOVEQ #0,D0
-    CALLLIB _LVOOpenLibrary
-    MOVE.L D0,GraphicsBase
-  ENDM
-
-TakeOverView MACRO
-    MOVE.L GraphicsBase,A6
-    MOVE.L gb_ActiView(A6),OldView
-    MOVEQ #0,D0
-    CALLLIB _LVOLoadView
-    CALLLIB _LVOWaitTOF
-    CALLLIB _LVOWaitTOF
-  ENDM
-
-PreserveOldCopper MACRO
-    MOVE.L $26(A6),OldCopper1
-    MOVE.L $32(A6),OldCopper2
-  ENDM
-
-GetVBRPointer MACRO
-    BSR getVBR
-    MOVE.L D0,VBRPtr
-  ENDM
-
-PreserveOldRegisters MACRO
-    LEA _custom,A6
-    MOVE.W adkconr(A6),Oldadkcon
-    MOVE.W intenar(A6),Oldintena
-    MOVE.W dmaconr(A6),Olddmacon
-  ENDM
-
-ClearRegisters MACRO
-    MOVE.W #$7FFF,D0
-    BSR waitRaster
-    MOVE.W D0,intena(A6)
-    MOVE.W D0,dmacon(A6)
-    MOVE.W D0,intreq(A6)
-  ENDM
-
-SetRegisters MACRO
-    MOVE.W #$C000,intena(A6) ; enable master interrupt
-    MOVE.W #$3FFF,intena(A6) ; disable every other interrupt
-
-    MOVE.W #DMAF_SETCLR|DMAF_COPPER|DMAF_RASTER|DMAF_BLITTER,dmacon(A6)
-    MOVE.W #DMAF_AUDIO|DMAF_DISK|DMAF_SPRITE,dmacon(A6)
-  ENDM
-
-_takeOverSystem:
-  MOVEM.L A6,-(SP)
-    CLR.W $100
-
-    MOVE.L $4,A6
-    CALLLIB _LVOForbid
-
-    OpenGraphicsLibrary
-    PreserveOldCopper
-
-    CALLLIB _LVOOwnBlitter
-    CALLLIB _LVOWaitBlit
-
-    PreserveOldRegisters
-
-    SetRegisters
-    TakeOverView
-  MOVEM.L (SP)+,A6
-  RTS
-
-waitRaster:
-  MOVE.L D0,-(SP)
-.loop:
-    MOVE.L $DFF004,D0
-    AND.L #$1FF00,D0
-    CMP.L #303<<8,D0
-    BNE .loop
-  MOVE.L (SP)+,D0
-  RTS
-
-_giveBackSystem:
-  CLR.W $100
-
-  MOVEM.L A6,-(SP)
-    LEA _custom,A6
-
-    MOVE.W #$8000,d0
-    OR.W D0,Olddmacon
-    OR.W D0,Oldintena
-    OR.W D0,Oldadkcon
-    SUBQ #1,D0
-
-    ;ClearRegisters
-
-    MOVE.L OldCopper1,cop1lc(A6)
-    MOVE.L OldCopper2,cop2lc(A6)
-    MOVE.W #1,copjmp1(A6)
-
-    MOVE.W Olddmacon,intena(A6)
-    MOVE.W Olddmacon,dmacon(A6)
-    MOVE.W Oldadkcon,adkcon(A6)
-
-    MOVE.L OldView,A1
-
-    MOVE.L GraphicsBase,A6
-    CALLLIB _LVOLoadView
-    CALLLIB _LVOWaitTOF
-    CALLLIB _LVOWaitTOF
-
-    MOVE.L $4,A6
-    MOVE.L GraphicsBase,D0
-    MOVE.L D0,A1
-    CALLLIB _LVOCloseLibrary
-
-    CALLLIB _LVOPermit
-  MOVEM.L (SP)+,A6
-  RTS
-
-getVBR:
-  MOVE.L A5,-(SP)
-    MOVEQ #0,D0
-    MOVE.L $4,A6
-    BTST #0,AttnFlags+1(A6)
-    BEQ .is68K
-    LEA .get010VBR(pc),A5
-    CALLLIB _LVOSupervisor
-.is68K:
-  MOVE.L (SP)+,A5
-  RTS
-
-.get010VBR:
-  dc.l $4E7A0801 ; movec vcr,d0
-  RTE
-
-  CNOP 0,4
-GraphicsLibrary dc.b 'graphics.library',0
-
-  CNOP 0,4
-GraphicsBase dc.l 1
-OldView dc.l 1
-OldCopper1 dc.l 1
-OldCopper2 dc.l 1
-VBRPtr dc.l 1
-Oldadkcon dc.w 0
-Oldintena dc.w 0
-Olddmacon dc.w 0

better_startup.c

@@ -1,98 +0,0 @@
-#include <clib/exec_protos.h>
-#include <clib/intuition_protos.h>
-#include <clib/graphics_protos.h>
-#include <exec/memory.h>
-#include <graphics/gfxbase.h>
-#include <hardware/custom.h>
-#include <hardware/dmabits.h>
-#include <exec/types.h>
- 
-extern struct GfxBase *GfxBase;
-extern far struct Custom custom;
- 
-int main(void) {
-  UWORD OldDMACON,OldINTENA,OldINTREQ,OldADKCON;
-  struct View *OldView = ((struct GfxBase *)GfxBase)->ActiView;
-  ULONG OldCopper = custom.cop1lc;
-  ULONG OldCopper2 = custom.cop2lc;
-  UWORD *copperlist = AllocMem(10000, MEMF_CHIP | MEMF_CLEAR);
-  UWORD *currentCopperlist;
-  UBYTE *bitplanes = AllocMem(320 * 256, MEMF_CHIP | MEMF_CLEAR);
-  int i;
- 
-  LoadView(0);
-  WaitTOF();
-  WaitTOF();
-  OwnBlitter();
-  WaitBlit();
- 
-  Forbid();
-
-  OldDMACON = custom.dmaconr | 0x8000;
-  OldINTENA = custom.intenar | 0x8000;
-  //OldINTREQ = custom.intreqr | 0x8000;
-  OldADKCON = custom.adkconr | 0x8000;
-
-  custom.intreq = 0x7fff;
-  custom.cmacon = 0x7fff;
-  custom.cmacon = 0x7fff;
-
-
-  // enable
-  custom.dmacon = DMAF_SETCLR | DMAF_COPPER | DMAF_RASTER | DMAF_BLITTER;
-   
-  // disable
-  custom.dmacon = DMAF_AUDIO | DMAF_DISK | DMAF_SPRITE;
-
-  custom.bplcon0 = (1 << 9) + (1 << 12);
-  custom.bplcon1 = 0;
-  custom.bplcon2 = 0;
-  custom.bpl1mod = 0;
-  custom.bpl2mod = 0;
-  custom.diwstrt = 0x2c21;
-  custom.diwstop = 0x2cc1;
-  custom.ddfstrt = 0x0038;
-  custom.ddfstop = 0x00d0;
-
-  currentCopperlist = copperlist;
-
-  *(currentCopperlist++) = 0x0050;
-  *(currentCopperlist++) = ((ULONG)bitplanes >> 16);
-  *(currentCopperlist++) = 0x0020;
-  *(currentCopperlist++) = ((ULONG)bitplanes && 16);
-  *(currentCopperlist++) = 0xffff;
-  *(currentCopperlist++) = 0xfffe;
-
-  custom.cop1lc = copperlist;
-
-  for (i = 0; i < 200; ++i) {
-    WaitTOF();
-  }
-
-  custom.dmacon = 0x7FFF;
-  custom.dmacon = OldDMACON;
- 
-  custom.intena = 0x7FFF;
-  custom.intena = OldINTENA;
- 
-  /*
-  custom.intreq = 0x7FFF;
-  custom.intreq = OldINTREQ;
-  */
- 
-  custom.adkcon = 0x7FFF;
-  custom.adkcon = OldADKCON;
-
-  custom.cop1lc = OldCopper;
-  custom.cop2lc = OldCopper1;
-
-  LoadView(OldView);
-  WaitTOF();
-  WaitTOF();
-  WaitBlit();
-  DisownBlitter();
-  Permit();
-
-  FreeMem(copperlist, 10000);
-  FreeMem(bitplanes, 320 * 256);
-}

bun.c

@@ -14,7 +14,6 @@
 #include "bun.h"
 #include "system/system.h"
 #include "system/blitter.h"
-#include "types.h"
 
 #define COOL_BUN_WIDTH (32)
 #define COOL_BUN_WIDTH_BYTES (COOL_BUN_WIDTH / 8)
@@ -84,34 +83,21 @@ void precalculateBunBLTALWM() {
   }
 }
 
-struct PrecalcBunInfo {
-  uint32_t memoryStartOffsetBytes;
-  uint16_t bltcon0;
-  uint16_t bltcon1;
-  uint16_t bltdmod;
-};
-
-struct PrecalcBunInfo precalcBunInfo[FRAMES_FOR_SCREEN][BUN_COUNT];
-
 void bun_offRightSide(
   int plusXValue,
   int y,
   struct ScreenDefinition *screenDefinition,
   struct ActiveScreenBufferDetails *activeScreenBufferDetails,
-  struct BunClear *bunClear,
+  struct BunClear *bunClear
-  struct PrecalcBunInfo *precalcBunInfo
 ) {
   uint8_t i, plane = 0;
   uint8_t shift = plusXValue & 15;
   uint8_t wordShift = (plusXValue >> 4);
   uint16_t bltalwm, bltcon0, bltcon1, bltdmod, bltsize;
 
-  /*
   bunClear->memoryStartOffsetBytes =  (y * screenDefinition->byteWidth) +
     screenDefinition->byteWidth - COOL_BUN_WIDTH_BYTES +
     wordShift * 2;
-    */
-  bunClear->memoryStartOffsetBytes = precalcBunInfo->memoryStartOffsetBytes;
   bunClear->heightRows = COOL_BUN_HEIGHT;
   bunClear->widthWords = 2 - wordShift;
   bunClear->direction = BLITTER_ASCENDING;
@@ -125,14 +111,11 @@ void bun_offRightSide(
   }
   */
 
-  //bltcon0 = BLTCON0(0xf0, 1, 0, 0, 1, shift);
+  bltcon0 = BLTCON0(0xf0, 1, 0, 0, 1, shift);
-  //bltcon1 = BLTCON1(bunClear->direction, shift);
+  bltcon1 = BLTCON1(bunClear->direction, shift);
-  //bltdmod = screenDefinition->byteWidth - COOL_BUN_WIDTH_BYTES +
-  //  wordShift * 2;
 
-  bltcon0 = precalcBunInfo->bltcon0;
+  bltdmod = screenDefinition->byteWidth - COOL_BUN_WIDTH_BYTES +
-  bltcon1 = precalcBunInfo->bltcon1;
+    wordShift * 2;
-  bltdmod = precalcBunInfo->bltdmod;
 
   bltsize = bunClear->widthWords + (bunClear->heightRows << 6);
 
@@ -161,8 +144,7 @@ void bun_offLeftSide(
   int y,
   struct ScreenDefinition *screenDefinition,
   struct ActiveScreenBufferDetails *activeScreenBufferDetails,
-  struct BunClear *bunClear,
+  struct BunClear *bunClear
-  struct PrecalcBunInfo *precalcBunInfo
 ) {
   unsigned char plane;
   uint8_t shift = minusXValue & 15;
@@ -173,11 +155,8 @@ void bun_offLeftSide(
   // y can't be 0 otherwise we will corrupt memory for now
   if (y == 0) return;
 
-  /*
   bunClear->memoryStartOffsetBytes = (screenDefinition->byteWidth * (y + COOL_BUN_LAST_ROW)) +
     2 - wordShift * 2;
-  */
-  bunClear->memoryStartOffsetBytes = precalcBunInfo->memoryStartOffsetBytes;
   bunClear->heightRows = COOL_BUN_HEIGHT;
   bunClear->widthWords = 2 - wordShift;
   bunClear->direction = BLITTER_DESCENDING;
@@ -191,12 +170,9 @@ void bun_offLeftSide(
   }
   */
 
-  //bltcon0 = BLTCON0(0xf0, 1, 0, 0, 1, shift);
+  bltcon0 = BLTCON0(0xf0, 1, 0, 0, 1, shift);
-  //bltcon1 = BLTCON1(bunClear->direction, shift);
+  bltcon1 = BLTCON1(bunClear->direction, shift);
-  //bltdmod = screenDefinition->byteWidth - 4 + wordShift * 2;
+  bltdmod = screenDefinition->byteWidth - 4 + wordShift * 2;
-  bltcon0 = precalcBunInfo->bltcon0;
-  bltcon1 = precalcBunInfo->bltcon1;
-  bltdmod = precalcBunInfo->bltdmod;
 
   bltsize = bunClear->widthWords + (bunClear->heightRows << 6);
 
@@ -228,29 +204,22 @@ void bun_anywhere(
   int y,
   struct ScreenDefinition *screenDefinition,
   struct ActiveScreenBufferDetails *activeScreenBufferDetails,
-  struct BunClear *bunClear,
+  struct BunClear *bunClear
-  struct PrecalcBunInfo *precalcBunInfo
 ) {
   uint8_t plane;
   uint8_t shift = x & 15;
   uint8_t needsExtraWord = shift != 0;
   uint16_t bltcon0, bltcon1, bltalwm, bltamod, bltdmod, bltsize;
 
-  //bunClear->memoryStartOffsetBytes = WORD_ALIGNED_BYTE_POSITION(screenDefinition->width, x, y);
+  bunClear->memoryStartOffsetBytes = WORD_ALIGNED_BYTE_POSITION(screenDefinition->width, x, y);
-  bunClear->memoryStartOffsetBytes = precalcBunInfo->memoryStartOffsetBytes;
 
   bunClear->heightRows = COOL_BUN_HEIGHT;
   bunClear->widthWords = 2 + needsExtraWord;
   bunClear->direction = BLITTER_ASCENDING;
 
   // buns will never interfere with a background so they don't need a mask
-  //bltcon0 = BLTCON0(0xf0, 1, 0, 0, 1, shift);
+  bltcon0 = BLTCON0(0xf0, 1, 0, 0, 1, shift);
-  //bltcon1 = BLTCON1(bunClear->direction, shift);
+  bltcon1 = BLTCON1(bunClear->direction, shift);
-  //bltdmod = screenDefinition->byteWidth - COOL_BUN_WIDTH_BYTES - (needsExtraWord * 2);
-
-  bltcon0 = precalcBunInfo->bltcon0;
-  bltcon1 = precalcBunInfo->bltcon1;
-  bltdmod = precalcBunInfo->bltdmod;
 
   if (needsExtraWord) {
     bltalwm = 0x0000;
@@ -259,6 +228,7 @@ void bun_anywhere(
   }
 
   bltamod = -(needsExtraWord * 2);
+  bltdmod = screenDefinition->byteWidth - COOL_BUN_WIDTH_BYTES - (needsExtraWord * 2);
   bltsize = bunClear->widthWords + (bunClear->heightRows << 6);
 
   for (plane = 0; plane < 2; ++plane) {
@@ -282,15 +252,12 @@ void bun_anywhere(
 
 #define ENABLE_RENDER_BUN_CHECKING (0)
 
-uint16_t screenDefCoolBunWidthCheck;
-
 void renderBun(
   int x,
   int y,
   struct ScreenDefinition *screenDefinition,
   struct ActiveScreenBufferDetails *activeScreenBufferDetails,
-  struct BunClear *bunClear,
+  struct BunClear *bunClear
-  struct PrecalcBunInfo *precalcBunInfo
 ) {
   /**
     * Conditions that will cause the program to crash if met. If your bun
@@ -312,19 +279,15 @@ void renderBun(
       y,
       screenDefinition,
       activeScreenBufferDetails,
-      bunClear,
+      bunClear
-      precalcBunInfo
     );
-  //} else if (x > screenDefinition->width - COOL_BUN_WIDTH) {
+  } else if (x > screenDefinition->width - COOL_BUN_WIDTH) {
-  } else if (x > screenDefCoolBunWidthCheck) {
     bun_offRightSide(
-      //x - (screenDefinition->width - COOL_BUN_WIDTH),
+      x - (screenDefinition->width - COOL_BUN_WIDTH),
-      x - screenDefCoolBunWidthCheck,
       y,
       screenDefinition,
       activeScreenBufferDetails,
-      bunClear,
+      bunClear
-      precalcBunInfo
     );
   } else {
     bun_anywhere(
@@ -332,8 +295,7 @@ void renderBun(
       y,
       screenDefinition,
       activeScreenBufferDetails,
-      bunClear,
+      bunClear
-      precalcBunInfo
     );
   }
 }
@@ -379,66 +341,6 @@ void calculateBunPositions(
 
 short int allBunPositionsByFrame[FRAMES_FOR_SCREEN][BUN_COUNT][2];
 
-void precalculateBunInfoForFrames(
-  struct ScreenDefinition *screenDefinition
-) {
-  int frame, bun;
-  int x, y;
-  uint8_t wordShift, shift, needsExtraWord;
-
-  screenDefCoolBunWidthCheck = screenDefinition->width - COOL_BUN_WIDTH;
-
-  for (frame = 0; frame < FRAMES_FOR_SCREEN; ++frame) {
-    for (bun = 0; bun < BUN_COUNT; ++bun) {
-      x = allBunPositionsByFrame[frame][bun][0];
-      y = allBunPositionsByFrame[frame][bun][1];
-
-      // off left
-      if (x < 0) {
-        x = -x;
-        shift = x & 15;
-        wordShift = x >> 4;
-
-        precalcBunInfo[frame][bun].memoryStartOffsetBytes =
-          (screenDefinition->byteWidth * (y + COOL_BUN_LAST_ROW)) +
-          2 - wordShift * 2;
-        precalcBunInfo[frame][bun].bltcon0 = BLTCON0(0xf0, 1, 0, 0, 1, shift);
-        precalcBunInfo[frame][bun].bltcon1 = BLTCON1(BLITTER_DESCENDING, shift);
-        precalcBunInfo[frame][bun].bltdmod =
-          screenDefinition->byteWidth - 4 +
-          wordShift * 2;
-      // off right
-      } else if (x > screenDefinition->width - COOL_BUN_WIDTH) {
-        x = x - (screenDefinition->width - COOL_BUN_WIDTH),
-
-        wordShift = x >> 4;
-        shift = x & 15;
-
-        precalcBunInfo[frame][bun].memoryStartOffsetBytes =
-          (y * screenDefinition->byteWidth) +
-          screenDefinition->byteWidth - COOL_BUN_WIDTH_BYTES +
-          wordShift * 2;
-        precalcBunInfo[frame][bun].bltcon0 = BLTCON0(0xf0, 1, 0, 0, 1, shift);
-        precalcBunInfo[frame][bun].bltcon1 = BLTCON1(BLITTER_ASCENDING, shift);
-        precalcBunInfo[frame][bun].bltdmod =
-          screenDefinition->byteWidth - COOL_BUN_WIDTH_BYTES +
-          wordShift * 2;
-      // anywhere
-      } else {
-        shift = x & 15;
-        needsExtraWord = shift != 0;
-
-        precalcBunInfo[frame][bun].memoryStartOffsetBytes =
-          WORD_ALIGNED_BYTE_POSITION(screenDefinition->width, x, y);
-        precalcBunInfo[frame][bun].bltcon0 = BLTCON0(0xf0, 1, 0, 0, 1, shift);
-        precalcBunInfo[frame][bun].bltcon1 = BLTCON1(BLITTER_ASCENDING, shift);
-        precalcBunInfo[frame][bun].bltdmod =
-          screenDefinition->byteWidth - COOL_BUN_WIDTH_BYTES - (needsExtraWord * 2);
-      }
-    }
-  }
-}
-
 void calculateAllBunPositions(
   struct ScreenDefinition *screenDefinition
 ) {
@@ -487,7 +389,6 @@ void setupBunRenderer(
   calculateAllBunPositions(screenDefinition);
   precalculateBunRenderInfo();
   precalculateBunBLTALWM();
-  precalculateBunInfoForFrames(screenDefinition);
 }
 
 /**
@@ -545,8 +446,7 @@ void renderBunFrame(
       allBunPositionsByFrame[frame][bun][1],
       bunRenderer->screenDefinition,
       bunRenderer->activeScreenBufferDetails,
-      &bunClearForScreen[bunRenderer->activeScreenBufferDetails->currentBuffer][bun],
+      &bunClearForScreen[bunRenderer->activeScreenBufferDetails->currentBuffer][bun]
-      &precalcBunInfo[frame][bun]
     );
   }
 

left_side.c

@@ -0,0 +1,90 @@
+/**
+* What do we need
+* * [ ] screen setup
+*/
+
+#include <hardware/custom.h>
+#include <hardware/cia.h>
+
+#include <clib/graphics_protos.h>
+
+#include "system/system.h"
+#include "system/copper.h"
+#include "system/blitter.h"
+
+#include "screen.h"
+
+extern struct Custom far custom;
+extern struct CIA far ciaa;
+
+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);
+
+extern unsigned char chip coolbun[];
+
+int main(void) {
+  struct ScreenDefinition screenDefinition;
+  struct ActiveScreenBufferDetails activeScreenBufferDetails;
+  uint16_t *copperlist, *currentCopperlist;
+  void *copperlistBitplanePointers[8][2];
+  int i, plane;
+
+  allocateDoubleBufferedScreenMemory(
+    &screenDefinition,
+    &activeScreenBufferDetails,
+    320,
+    256,
+    2
+  );
+
+  copperlist = prepareNewCopperlist(300);
+
+  currentCopperlist = addDisplayToCopperlist(
+    copperlist,
+    &screenDefinition,
+    &activeScreenBufferDetails,
+    &copperlistBitplanePointers
+  );
+
+  COPPERLIST_MOVE(currentCopperlist, custom_color, 0x3a6);
+  COPPERLIST_MOVE(currentCopperlist, custom_color + 2, 0x000);
+  COPPERLIST_MOVE(currentCopperlist, custom_color + 4, 0xfff);
+  currentCopperlist = setUpEmptySpritesInCopperlist(currentCopperlist);
+
+  endCopperlist(currentCopperlist);
+
+  takeOverSystem();
+
+  setCopperlist(copperlist);
+  setUpDisplay((uint32_t)screenDefinition.bitplanes);
+
+  // Render a cut off bun at -8x50
+
+  for (plane = 0; plane < 2; ++plane) {
+    custom.bltcon0 = BLTCON0(0xf0, 1, 0, 0, 1, 8);
+    custom.bltcon1 = BLTCON1(BLITTER_DESCENDING, 8);
+
+    custom.bltapt = coolbun + (plane * 4 * 32) + (31 * 4) + 2;
+    custom.bltdpt = activeScreenBufferDetails.planes[plane] + ((50 + 31) * 320 / 8) + 2;
+    custom.bltafwm = 0xffff;
+    custom.bltalwm = 0x00ff;
+
+    custom.bltamod = 0;
+    custom.bltdmod = 40 - 4;
+
+    custom.bltsize = 2 + (32 << 6);
+
+    WaitBlit();
+  }
+
+  while (1) {
+    if ((ciaa.ciapra >> 6) != 3) break;
+  }
+
+  giveBackSystem();
+
+  freeCopperlist(copperlist);
+
+  teardownScreen(&screenDefinition);
+}

right_side.c

@@ -0,0 +1,90 @@
+/**
+* What do we need
+* * [ ] screen setup
+*/
+
+#include <hardware/custom.h>
+#include <hardware/cia.h>
+
+#include <clib/graphics_protos.h>
+
+#include "system/system.h"
+#include "system/copper.h"
+#include "system/blitter.h"
+
+#include "screen.h"
+
+extern struct Custom far custom;
+extern struct CIA far ciaa;
+
+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);
+
+extern unsigned char chip coolbun[];
+
+int main(void) {
+  struct ScreenDefinition screenDefinition;
+  struct ActiveScreenBufferDetails activeScreenBufferDetails;
+  uint16_t *copperlist, *currentCopperlist;
+  void *copperlistBitplanePointers[8][2];
+  int i, plane;
+
+  allocateDoubleBufferedScreenMemory(
+    &screenDefinition,
+    &activeScreenBufferDetails,
+    320,
+    256,
+    2
+  );
+
+  copperlist = prepareNewCopperlist(300);
+
+  currentCopperlist = addDisplayToCopperlist(
+    copperlist,
+    &screenDefinition,
+    &activeScreenBufferDetails,
+    &copperlistBitplanePointers
+  );
+
+  COPPERLIST_MOVE(currentCopperlist, custom_color, 0x3a6);
+  COPPERLIST_MOVE(currentCopperlist, custom_color + 2, 0x000);
+  COPPERLIST_MOVE(currentCopperlist, custom_color + 4, 0xfff);
+  currentCopperlist = setUpEmptySpritesInCopperlist(currentCopperlist);
+
+  endCopperlist(currentCopperlist);
+
+  takeOverSystem();
+
+  setCopperlist(copperlist);
+  setUpDisplay((uint32_t)screenDefinition.bitplanes);
+
+  // Render a cut off bun at -8x50
+
+  for (plane = 0; plane < 2; ++plane) {
+    custom.bltcon0 = BLTCON0(0xf0, 1, 0, 0, 1, 8);
+    custom.bltcon1 = BLTCON1(BLITTER_ASCENDING, 8);
+
+    custom.bltapt = coolbun + (plane * 4 * 32);
+    custom.bltdpt = activeScreenBufferDetails.planes[plane] + (50 * 320 / 8) + (40 - 4);
+    custom.bltafwm = 0xffff;
+    custom.bltalwm = 0xff00;
+
+    custom.bltamod = 0;
+    custom.bltdmod = 40 - 4;
+
+    custom.bltsize = 2 + (32 << 6);
+
+    WaitBlit();
+  }
+
+  while (1) {
+    if ((ciaa.ciapra >> 6) != 3) break;
+  }
+
+  giveBackSystem();
+
+  freeCopperlist(copperlist);
+
+  teardownScreen(&screenDefinition);
+}

smakefile

@@ -1,4 +1,9 @@
 MAIN_OBJS = main.o images.o system.lib screen.o bun.o
+32_objs = 32x50_bun.o system.lib screen.o images.o
+33_objs = 33x50_bun.o system.lib screen.o images.o
+left_side_objs = left_side.o system.lib screen.o images.o
+right_side_objs = right_side.o system.lib screen.o images.o
+any_position = any_position.o system.lib screen.o images.o
 
 all: main
 
@@ -14,6 +19,21 @@ 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)
 
+32x50: $(32_objs)
+	sc link to 32x50 $(32_objs)
+
+33x50: $(33_objs)
+	sc link to 33x50 $(33_objs)
+
+left_side: $(left_side_objs)
+	sc link to left_side $(left_side_objs)
+
+right_side: $(right_side_objs)
+	sc link to right_side $(right_side_objs)
+
+any_position: $(any_position)
+	sc link to any_position $(any_position)
+
 test: bun_test.o bun.o
 	sc link to bun_test identifierlength=32 math=standard bun_test.o bun.o cutest/CuTest.c