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cool-bun-demo
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code restructured

This commit is contained in:
John Bintz 2024-05-29 07:57:08 -04:00
parent 391c03b8aa
commit 098b3f3ebf
8 changed files with 88 additions and 53 deletions
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79
bun.c
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@ -1,6 +1,18 @@
// Custom
#include <hardware/custom.h>
// WaitBlit()
#include <clib/graphics_protos.h>
// AllocMem(), FreeMem()
#include <clib/exec_protos.h>
#include <exec/memory.h>
#include "screen.h"
#include "bun.h"
#include "system/system.h"
// linked as raw bytes in assembler
extern unsigned char far coolbun[];
unsigned char *coolbunArea;
@ -9,18 +21,28 @@ unsigned char *coolbunArea;
#define COOL_BUN_WIDTH_BYTES (COOL_BUN_WIDTH / 8)
#define COOL_BUN_HEIGHT (32)
#define COOL_BUN_PLANES (2)
#define COOL_BUN_LAST_ROW (COOL_BUN_HEIGHT - 1)
#define COOL_BUN_LAST_ROW_BYTES (COOL_BUN_LAST_ROW * COOL_BUN_WIDTH_BYTES)
#define COOL_BUN_PLANE_SIZE (COOL_BUN_WIDTH_BYTES * COOL_BUN_HEIGHT)
#define COOL_BUN_MEMORY_SIZE (COOL_BUN_PLANE_SIZE * COOL_BUN_PLANES)
#define BLTCON0( \
minterm, aChan, bChan, cChan, dChan, shift \
) (minterm + (aChan << 11) + (bChan << 10) + (cChan << 9) + (dChan << 8) + (shift << 12))
#define BLTCON1(descending, shift) ((descending << 1) + (shift << 12))
extern struct Custom far custom;
void setupBun() {
unsigned char *currentCoolBunArea, *currentCoolBun;
unsigned int x, y, plane;
coolbunArea = AllocMem(COOL_BUN_MEMORY_SIZE, MEMF_CHIP | MEMF_CLEAR);
currentCoolBunArea = coolbunArea;
currentCoolBun = coolbun;
currentCoolBunArea = coolbunArea;
/*
for (plane = 0; plane < COOL_BUN_PLANES; ++plane) {
for (y = 0; y < COOL_BUN_HEIGHT; ++y) {
for (x = 0; x < COOL_BUN_WIDTH_BYTES; ++x) {
@ -28,28 +50,32 @@ void setupBun() {
}
}
}
*/
CopyMem(coolbun, coolbunArea, COOL_BUN_MEMORY_SIZE);
}
void teardownBun() {
FreeMem(coolbunArea, COOL_BUN_MEMORY_SIZE);
}
void bun_offRightSide(int plusXValue, int y, struct ScreenSetup *screenSetup) {
void bun_offRightSide(int plusXValue, int y, struct CurrentScreen *currentScreen) {
uint8_t i, plane = 0;
uint8_t shift = plusXValue & 15;
uint8_t wordShift = (plusXValue >> 4);
uint16_t bltalwm;
for (plane = 0; plane < 2; ++plane) {
custom.bltcon0 = 0xc0 + (1 << 8) + (1 << 10) + (shift << 12);
custom.bltcon1 = (shift << 12);
custom.bltcon0 = BLTCON0(0xc0, 0, 1, 0, 1, shift);
custom.bltcon1 = BLTCON1(0, shift);
custom.bltadat = 0xffff;
custom.bltbpt = coolbunArea + plane * COOL_BUN_PLANE_SIZE;
custom.bltdpt = screenSetup->memoryStart +
plane * screenSetup->nextBitplaneAdvance +
(y * screenSetup.width + screenSetup.width - COOL_BUN_WIDTH) / 8
+ wordShift * 2;
custom.bltbpt = coolbunArea +
plane * COOL_BUN_PLANE_SIZE;
custom.bltdpt = currentScreen->planes[plane] +
(y * currentScreen->byteWidth) +
currentScreen->byteWidth - COOL_BUN_WIDTH_BYTES +
wordShift * 2;
custom.bltafwm = 0xffff;
bltalwm = 0x0000;
@ -59,7 +85,8 @@ void bun_offRightSide(int plusXValue, int y, struct ScreenSetup *screenSetup) {
custom.bltalwm = bltalwm;
custom.bltbmod = wordShift * 2;
custom.bltdmod = (screenSetup.width - COOL_BUN_WIDTH) / 8 + wordShift * 2;
custom.bltdmod = currentScreen->byteWidth - COOL_BUN_WIDTH_BYTES +
wordShift * 2;
custom.bltsize = 2 - wordShift + (COOL_BUN_HEIGHT << 6);
@ -67,11 +94,6 @@ void bun_offRightSide(int plusXValue, int y, struct ScreenSetup *screenSetup) {
}
}
#define BLTCON0( \
minterm, aChan, bChan, cChan, dChan, shift \
) (minterm + (aChan << 11) + (bChan << 10) + (cChan << 9) + (dChan << 8) + (shift << 12)
#define BLTCON1(descending, shift) ((descending << 1) + (shift << 12))
void bun_offLeftSide(int minusXValue, int y, struct CurrentScreen *currentScreen) {
unsigned char plane;
uint8_t shift = minusXValue & 15;
@ -90,10 +112,15 @@ void bun_offLeftSide(int minusXValue, int y, struct CurrentScreen *currentScreen
// a has a mask we're shifting
custom.bltadat = 0xffff;
// b has bun data
custom.bltbpt = coolbunArea + 2 + ((COOL_BUN_HEIGHT - 1) * 4) + plane * COOL_BUN_PLANE_SIZE;
custom.bltbpt = coolbunArea + 2 +
COOL_BUN_LAST_ROW_BYTES +
plane * COOL_BUN_PLANE_SIZE;
// d is the part on screen
custom.bltdpt = screenSetup.memoryStart + screenSetup.nextBitplaneAdvance * plane + (screenSetup.width * (y + COOL_BUN_HEIGHT - 1) / 8) + 2 - wordShift * 2;
custom.bltdpt = currentScreen->planes[plane] +
(currentScreen->byteWidth * (y + COOL_BUN_LAST_ROW)) +
2 -
wordShift * 2;
custom.bltafwm = 0xffff;
bltalwm = 0x0000;
@ -103,7 +130,7 @@ void bun_offLeftSide(int minusXValue, int y, struct CurrentScreen *currentScreen
custom.bltalwm = bltalwm;
custom.bltbmod = wordShift * 2;
custom.bltdmod = screenSetup.width / 8 - 4 + wordShift * 2;
custom.bltdmod = currentScreen->byteWidth - 4 + wordShift * 2;
custom.bltsize = 2 - wordShift + (COOL_BUN_HEIGHT << 6);
@ -111,7 +138,7 @@ void bun_offLeftSide(int minusXValue, int y, struct CurrentScreen *currentScreen
}
}
void bun_anywhere(int x, int y, struct ScreenSetup *screenSetup) {
void bun_anywhere(int x, int y, struct CurrentScreen *currentScreen) {
uint8_t plane;
uint8_t shift = x & 15;
uint8_t needsExtraWord = shift != 0;
@ -121,12 +148,13 @@ void bun_anywhere(int x, int y, struct ScreenSetup *screenSetup) {
// buns will never interfere with a background so they don't need a mask
// they do need the scratch area though
custom.bltcon0 = 0xc0 + (1 << 8) + (1 << 10) + (shift << 12);
custom.bltcon1 = (shift << 12);
custom.bltcon0 = BLTCON0(0xc0, 0, 1, 0, 1, shift);
custom.bltcon1 = BLTCON1(0, shift);
custom.bltadat = 0xffff;
custom.bltbpt = coolbunArea + plane * COOL_BUN_PLANE_SIZE;
custom.bltdpt = screenSetup.memoryStart + WORD_ALIGNED_BYTE_POSITION(screenSetup.width, x, y) + screenSetup.nextBitplaneAdvance * plane;
custom.bltdpt = currentScreen->planes[plane] +
WORD_ALIGNED_BYTE_POSITION(currentScreen->pixelWidth, x, y);
// custom.bltdpt = screenSetup.memoryStart;
custom.bltafwm = 0xffff;
@ -135,8 +163,9 @@ void bun_anywhere(int x, int y, struct ScreenSetup *screenSetup) {
} else {
custom.bltalwm = 0xffff;
}
custom.bltbmod = -(needsExtraWord * 2);
custom.bltdmod = (screenSetup.width / 8) - COOL_BUN_WIDTH_BYTES - (needsExtraWord * 2);
custom.bltdmod = currentScreen->byteWidth - COOL_BUN_WIDTH_BYTES - (needsExtraWord * 2);
custom.bltsize = (2 + needsExtraWord) + (COOL_BUN_HEIGHT << 6);
WaitBlit();
@ -157,7 +186,7 @@ void renderBun(int x, int y, struct CurrentScreen *currentScreen) {
if (x < 0) {
bun_offLeftSide(-x, y, currentScreen);
} else if (x > screenSetup.width - COOL_BUN_WIDTH) {
} else if (x > currentScreen->pixelWidth - COOL_BUN_WIDTH) {
bun_offRightSide(x - (currentScreen->pixelWidth - COOL_BUN_WIDTH), y, currentScreen);
} else {
bun_anywhere(x, y, currentScreen);

2
bun.h
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@ -4,7 +4,7 @@
#include "screen.h"
void setupBun();
void renderBun(int x, int y, struct ScreenSetup *screenSetup);
void renderBun(int x, int y, struct CurrentScreen *currentScreen);
void teardownBun();
#endif

BIN
main
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Binary file not shown.

12
main.c
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@ -46,12 +46,10 @@ int main(void) {
colors[2] = 0x0fff;
colors[3] = 0x000f;
setupBun();
setupScreen(&screenSetup, SCREEN_WIDTH, SCREEN_HEIGHT, 3);
setupInitialCurrentScreen(&screenSetup, &currentScreen);
teardownScreen(&screenSetup);
return 0;
// blitter copy the first bitplane row down to the second
copperlist = prepareNewCopperlist();
@ -59,8 +57,10 @@ int main(void) {
takeOverSystem();
setCopperlist(copperlist);
setUpDisplay(&screenSetup);
setUpDisplay((uint32_t)screenSetup.bitplanes);
// TODO: [ ] A struct that can be filled with the locations in the copperlist where
// bitplane addresses go
currentCopperlist = addDisplayToCopperlist(copperlist, &screenSetup);
//currentCopperlist = addColorsToCopperlist(currentCopperlist, colors, 16);
*(currentCopperlist++) = custom_color;
@ -107,7 +107,7 @@ int main(void) {
}
*/
renderBun(i, 45, &screenSetup);
renderBun(i, 45, &currentScreen);
}
for (i = 0; i < 100; ++i) {
@ -116,7 +116,7 @@ int main(void) {
giveBackSystem();
freeScreen(&screenSetup);
teardownScreen(&screenSetup);
freeCopperlist(copperlist);

4
system/blitter.h
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@ -4,9 +4,8 @@
#include "types.h"
#include "screen.h"
#define WORD_ALIGNED_BYTE_POSITION(width, x, y) (((width * y + x) >> 3) & 0xfffe)
#define WORD_ALIGNED_BYTE_X(x) (((x) >> 3) & 0xfffe)
/*
struct BlitAreaDetails {
unsigned char *target;
uint16_t drawAreaWidth;
@ -77,5 +76,6 @@ void blit_marquee(
uint16_t ey,
uint16_t ty
);
*/
#endif

5
system/system.h
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@ -4,6 +4,9 @@
#include "types.h"
#include "screen.h"
#define WORD_ALIGNED_BYTE_POSITION(width, x, y) (((width * y + x) >> 3) & 0xfffe)
#define WORD_ALIGNED_BYTE_X(x) (((x) >> 3) & 0xfffe)
// this needs to be kept in sync with the XDEFs in system.s
// copperlist
@ -14,7 +17,7 @@ extern uint16_t* addColorsToCopperlist(uint16_t *copperlist, color_t[], int coun
extern void takeOverSystem(void);
extern void giveBackSystem(void);
extern void setUpDisplay(struct ScreenSetup *);
extern void setUpDisplay(uint32_t bitplaneCount);
extern void myWaitBlit(void);
extern uint16_t WaitBOF(uint16_t line);

8
system/system.s
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@ -205,16 +205,17 @@ _endCopperlist:
RTS
; @stack *ScreenSetup
; @stack bitplaneCount
_setUpDisplay:
MOVE.L 4(A7),A0
MOVE.L D2,-(SP)
MOVE.L 4(A7),D2
LEA _custom,A1
MOVEQ #0,D0
MOVE.W #BPLCON0_COLOR,D0
MOVEQ #0,D1
MOVE.W ScreenSetup_bitplanes(A0),D1
MOVE.W D2,D1
AND.W #$7,D1
ROL.W #8,D1
ROL.W #4,D1
@ -227,6 +228,7 @@ _setUpDisplay:
MOVE.W #$2cc1,diwstop(A1)
MOVE.W #$0038,ddfstrt(A1)
MOVE.W #$00d0,ddfstop(A1)
MOVE.L (SP)+,D2
RTS

1
types.h
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@ -4,6 +4,7 @@
#include <exec/types.h>
typedef unsigned short color_t;
typedef unsigned long uint32_t;
typedef unsigned short uint16_t;
typedef unsigned char uint8_t;
typedef signed char int8_t;