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cool-bun-demo
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In which John learns about the playfield hardware and sprite priorities

This commit is contained in:
John Bintz 2024-09-12 08:26:53 -04:00
parent a73506a27b
commit 3a42da655b
4 changed files with 56 additions and 23 deletions
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7
bun.c
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@ -310,6 +310,13 @@ void calculateBunPositions(
bunPositions[current][0] = x;
bunPositions[current][1] = y;
// for the blitter video
/*
if (frame == 0) {
printf("%d,%d\n", bunPositions[current][0], bunPositions[current][1]);
}
*/
}
}

BIN
main
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Binary file not shown.

69
main.c
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@ -27,6 +27,9 @@ extern struct CIA far ciaa;
#define SCRATCH_AREA_HEIGHT_ROWS (34)
#define SCRATCH_AREA_MEMORY_SIZE (SCRATCH_AREA_WIDTH_BYTES * SCRATCH_AREA_HEIGHT_ROWS)
// change to 0 to not render sprites
#define RENDER_SPRITES (1)
volatile short *dbg = (volatile short *)0x100;
unsigned char *scratchArea;
@ -143,38 +146,47 @@ int main(void) {
*(currentCopperlist++) = custom_color + 4;
*(currentCopperlist++) = 0xfff;
for (i = 0; i < 8; ++i) {
spriteDataPointer = (uint32_t)&SpriteData;
spriteDataPointer += ((256 + 2) * 4) * i;
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 + i * 4;
*(currentCopperlist++) = (spriteDataPointer >> 16);
*(currentCopperlist++) = custom_sprite + 2 + i * 4;
*(currentCopperlist++) = (spriteDataPointer & 0xffff);
*(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) {
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++);
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++);
// set sprite position
*(currentCopperlist++) = custom_sprite_control + i * 8;
*(currentCopperlist++) = *(currentSpriteCopperlist++);
*(currentCopperlist++) = custom_sprite_control + i * 8 + 2;
*(currentCopperlist++) = *(currentSpriteCopperlist++);
*(currentCopperlist++) = custom_sprite_control + i * 8 + 2;
*(currentCopperlist++) = *(currentSpriteCopperlist++);
}
} else {
printf("Skipping render\n");
}
for (i = 3; i < 8; ++i) {
@ -188,6 +200,19 @@ int main(void) {
endCopperlist(currentCopperlist);
/*
copperlist debugging
for (i = 0; i < 20; ++i) {
printf(
"%x %x %x %x\n",
*(copperlist + (i * 4)),
*(copperlist + (i * 4) + 1),
*(copperlist + (i * 4) + 2),
*(copperlist + (i * 4) + 3)
);
}
*/
takeOverSystem();
setCopperlist(copperlist);

3
system/system.s
View File

@ -360,7 +360,8 @@ _setUpDisplay:
MOVE.W D0,bplcon0(A1)
MOVE.W #0,bplcon1(A1)
MOVE.W #0,bplcon2(A1)
; sprites always on top
MOVE.W #$0020,bplcon2(A1)
MOVE.W #0,bpl1mod(A1)
MOVE.W #0,bpl2mod(A1)
MOVE.W #$2c81,diwstrt(A1)