TheIndustriousRabbit/cool-bun-demo
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More clarity work

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This commit is contained in:
John Bintz 2024-09-19 08:09:10 -04:00
parent 1d7e327194
commit c1d9f23026
5 changed files with 51 additions and 40 deletions
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11
main.c
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@ -28,8 +28,15 @@ volatile short *dbg = (volatile short *)0x100;
struct ScreenDefinition screenDefinition;
struct ActiveScreenBufferDetails activeScreenBufferDetails;
/**
* The locations within the copperlist data where the bitplanes are referenced.
* We change these areas of memory directly to implement double buffering.
* Addresses are to the high, then low, word of the plane memory address in the copperlist.
*
* @see addDisplayToCopperlist
*/
void *copperlistBitplanePointers[8][2];
void *copperlistSpritePointers[8];
#define offsetof(s, m) &((struct s *)0)->m
uint16_t custom_color = (uint16_t)offsetof(Custom, color);
@ -130,7 +137,7 @@ int main(void) {
// blitter copy the first bitplane row down to the second
copperlist = prepareNewCopperlist();
copperlist = prepareNewCopperlist(10000);
currentCopperlist = addDisplayToCopperlist(
copperlist,

14
system/copper.c
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@ -7,9 +7,15 @@
extern struct Custom far custom;
uint16_t * prepareNewCopperlist(void) {
uint16_t *copperlist = AllocMem(
COPPERLIST_SIZE,
uint16_t copperlistSize;
uint16_t * prepareNewCopperlist(uint16_t size_b) {
uint16_t *copperlist;
copperlistSize = size_b;
copperlist = AllocMem(
copperlistSize,
MEMF_CHIP | MEMF_CLEAR
);
@ -24,5 +30,5 @@ void setCopperlist(uint16_t *copperlist) {
}
void freeCopperlist(uint16_t *copperlist) {
FreeMem(copperlist, COPPERLIST_SIZE);
FreeMem(copperlist, copperlistSize);
}

4
system/copper.h
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@ -1,11 +1,9 @@
#ifndef __COPPER_H__
#define __COPPER_H__
#define COPPERLIST_SIZE (10000)
#include "../types.h"
uint16_t * prepareNewCopperlist(void);
uint16_t * prepareNewCopperlist(uint16_t size_b);
void setCopperlist(uint16_t *copperlist);
void freeCopperlist(uint16_t *copperlist);

8
system/system.h
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@ -14,13 +14,13 @@ extern void initializeCopperlist(void *copperlist);
extern uint16_t* endCopperlist(uint16_t *copperlist);
extern uint16_t* addDisplayToCopperlist(
uint16_t *copperlist,
struct ScreenSetup *,
struct CurrentScreen *,
struct ScreenDefinition *,
struct ActiveScreenBufferDetails *,
void *copperlistBitplanePointers
);
extern void updateDisplayInCopperList(
struct ScreenSetup *,
struct CurrentScreen *,
struct ScreenDefinition *,
struct ActiveScreenBufferDetails *,
void *copperlistBitplanePointers
);
extern uint16_t* addColorsToCopperlist(uint16_t *copperlist, color_t[], int count);

54
system/system.s
View File

@ -56,22 +56,22 @@ RestoreRegister MACRO
MOVE.W Old\1,\1(A0)
ENDM
STRUCTURE ScreenSetup,0
UWORD ScreenSetup_width
UWORD ScreenSetup_height
UWORD ScreenSetup_bitplanes
ULONG ScreenSetup_memoryStart
UWORD ScreenSetup_byteWidth
UWORD ScreenSetup_nextBitplaneAdvance
UWORD ScreenSetup_nextBufferAdvance
ULONG ScreenSetup_copperlistBitplanePointers
LABEL ScreenSetup_SIZEOF
STRUCTURE ScreenDefinition,0
UWORD ScreenDefinition_width
UWORD ScreenDefinition_height
UWORD ScreenDefinition_bitplanes
ULONG ScreenDefinition_memoryStart
UWORD ScreenDefinition_byteWidth
UWORD ScreenDefinition_nextBitplaneAdvance
UWORD ScreenDefinition_nextBufferAdvance
ULONG ScreenDefinition_copperlistBitplanePointers
LABEL ScreenDefinition_SIZEOF
STRUCTURE CurrentScreen,0
UWORD CurrentScreen_currentBuffer
CurrentScreen_planes EQU SOFFSET
STRUCTURE ActiveScreenBufferDetails,0
UWORD ActiveScreenBufferDetails_currentBuffer
ActiveScreenBufferDetails_planes EQU SOFFSET
SOFFSET SET SOFFSET+(8*4)
LABEL CurrentScreen_SIZEOF
LABEL ActiveScreenBufferDetails_SIZEOF
BPLCON0_COLOR EQU $200
@ -178,8 +178,8 @@ _initializeCopperlist:
RTS
; @stack *copperlist Pointer to copperlist
; @stack ScreenSetup Pointer to screenSetup struct
; @stack CurrentScreen Pointer to currentScreen struct
; @stack ScreenDefinition Pointer to screenSetup struct
; @stack ActiveScreenBufferDetails Pointer to currentScreen struct
; @stack copperlistBitplanePointers Pointer to bitplane pointers within the copper list [[high, low], ...]
STRUCTURE updateDisplayInCopperList,4
ULONG updateDisplayInCopperList_screenSetup
@ -194,9 +194,9 @@ _updateDisplayInCopperList:
MOVE.L D0,A2
; a2 has copperlistBitplanePointers
MOVE.W ScreenSetup_bitplanes(A0),D1
MOVE.W ScreenDefinition_bitplanes(A0),D1
SUBQ #1,D1
LEA CurrentScreen_planes(A1),A1
LEA ActiveScreenBufferDetails_planes(A1),A1
; a1 has planes
.continue:
@ -247,13 +247,13 @@ _setUpEmptySpritesInCopperlist:
RTS
; @stack *copperlist Pointer to copperlist
; @stack ScreenSetup Pointer to screenSetup struct
; @stack CurrentScreen Pointer to currentScreen struct
; @stack copperlistBitplanePointers Pointer to currentScreen struct
; @stack ScreenDefinition Pointer to screenDefinition struct
; @stack ActiveScreenBufferDetails Pointer to activeScreenBufferDetails struct
; @stack copperlistBitplanePointers Pointer to copperlistBitplanePointers struct
STRUCTURE AddDisplayToCopperListParams,4
ULONG AddDisplayToCopperListParams_copperlistPtr
ULONG AddDisplayToCopperListParams_screenSetupPtr
ULONG AddDisplayToCopperListParams_currentScreenPtr
ULONG AddDisplayToCopperListParams_screenDefinitionPtr
ULONG AddDisplayToCopperListParams_activeScreenBufferDetailsPtr
ULONG AddDisplayToCopperListParams_copperlistBitplanePointersPtr
_addDisplayToCopperlist:
MOVE.L A7,A0
@ -261,16 +261,16 @@ _addDisplayToCopperlist:
; A2,D2,D3
MOVEM.L A2-A4/D2-D4,-(SP)
MOVE.L AddDisplayToCopperListParams_copperlistPtr(A0),A1 ; copperlist
MOVE.L AddDisplayToCopperListParams_screenSetupPtr(A0),A2 ; screenSetup
MOVE.L AddDisplayToCopperListParams_currentScreenPtr(A0),A3 ; currentScreen
MOVE.L AddDisplayToCopperListParams_screenDefinitionPtr(A0),A2 ; screenDefinition
MOVE.L AddDisplayToCopperListParams_activeScreenBufferDetailsPtr(A0),A3 ; currentScreen
MOVE.L AddDisplayToCopperListParams_copperlistBitplanePointersPtr(A0),A4 ; copperlistBitplanePointers
LEA CurrentScreen_planes(A3),A3
LEA ActiveScreenBufferDetails_planes(A3),A3
; a3 contains address to planes
MOVEQ #0,D0
MOVE.W ScreenSetup_bitplanes(A2),D0
MOVE.W ScreenDefinition_bitplanes(A2),D0
; d0 is num of bitplanes
; set up bplpt