Home » Archimedes archive » Acorn User » AU 1997-01 B.adf » Features » Arcade/!Popcorn/c/Process
Arcade/!Popcorn/c/Process
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Archimedes archive » Acorn User » AU 1997-01 B.adf » Features |
| Filename: | Arcade/!Popcorn/c/Process |
| Read OK: | ✔ |
| File size: | 11CC bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
#include "Popcorn:h.Popcorn"
void Popcorn_Process(struct object_table* table, BOOL plot, int moves)
{
register int scan;
struct game_object *obj;
union object_flags reason;
if (table->collisions != NULL)
table->collisions->entries = 0;
do
{
scan = 0;
while (scan != table->max_objects)
{
obj = &(table->object[scan]);
if (obj->object_id != 0)
{
if (obj->flags.bits.gravity)
{
obj->xv=obj->xv+table->grav_x;
obj->yv=obj->yv+table->grav_y;
}
if (obj->flags.bits.velocities)
{
obj->x=obj->x + obj->xv;
obj->y=obj->y + obj->yv;
}
reason.word = 0;
obj->timer.value = obj->timer.value - obj->timer.decrement;
if (obj->flags.bits.attn_every)
reason.bits.attn_every = 1;
if (obj->flags.bits.attn_plot && plot && moves == 1)
reason.bits.attn_plot = 1;
if (obj->flags.bits.attn_timer && obj->timer.value <= 0)
reason.bits.attn_timer = 1;
if (obj->flags.bits.attn_plotout && Popcorn_Outside(obj, &plot_window))
reason.bits.attn_plotout = 1;
if (obj->flags.bits.attn_gameout && Popcorn_Outside(obj, &game_window))
reason.bits.attn_gameout = 1;
if (obj->flags.bits.attn_userout && Popcorn_Outside(obj, &user_window))
reason.bits.attn_userout = 1;
if (obj->flags.bits.animate)
{
if (obj->flags.bits.yoyo) /* Sort out yoyo animation; fiddly in C! */
{
if (obj->flags.bits.yoyo_dec)
{
obj->frame = obj->frame - 1;
if (obj->frame == -1)
{ obj->frame++; obj->flags.bits.yoyo_dec = FALSE; }
}
else
{
obj->frame = obj->frame + 1;
if (obj->frame == obj->plot_id.animation->frames)
{ obj->frame--; obj->flags.bits.yoyo_dec = TRUE; }
}
}
else
{
obj->frame++;
if (obj->frame == obj->plot_id.animation->frames)
obj->frame = 0;
}
obj->size.x = obj->plot_id.animation->frame[obj->frame].size_x;
obj->size.y = obj->plot_id.animation->frame[obj->frame].size_y;
obj->plot_offset.x=obj->plot_id.animation->frame[obj->frame].centre_x;
obj->plot_offset.y=obj->plot_id.animation->frame[obj->frame].centre_y;
}
if (obj->handler != NULL && reason.word != 0)
(obj->handler)((void*) obj, reason, NULL);
if (obj->flags.bits.std_plot && plot && obj->flags.bits.animate && moves == 1 && obj->plot_id.animation->frame[obj->frame].sprite_anchor != NULL)
Popcorn_PlotSprite(*obj->plot_id.animation->frame[obj->frame].sprite_anchor,
(obj->x >> 12) - (obj->plot_offset.x),
(obj->y >> 12) - (obj->plot_offset.y) );
if (obj->flags.bits.std_plot && plot && !obj->flags.bits.animate && moves == 1 && obj->plot_id.sprite_anchor != NULL)
Popcorn_PlotSprite(*obj->plot_id.sprite_anchor,
(obj->x >> 12) - (obj->plot_offset.x),
(obj->y >> 12) - (obj->plot_offset.y) );
if ((obj->flags.bits.kill_timer && obj->timer.value <= 0)
|| (obj->flags.bits.kill_plotout && Popcorn_Outside(obj, &plot_window))
|| (obj->flags.bits.kill_gameout && Popcorn_Outside(obj, &game_window))
|| (obj->flags.bits.kill_userout && Popcorn_Outside(obj, &user_window))
) Popcorn_DeleteObject(obj);
if (obj->flags.bits.collide && table->collisions != NULL && obj->object_id != 0 && moves == 1)
{
table->collisions->collision[table->collisions->entries].x0
= (obj->x>>12) - obj->plot_offset.x;
table->collisions->collision[table->collisions->entries].y0
= (obj->y>>12) - obj->plot_offset.y;
table->collisions->collision[table->collisions->entries].x1
= table->collisions->collision[table->collisions->entries].x0
+ obj->size.x;
table->collisions->collision[table->collisions->entries].y1
= table->collisions->collision[table->collisions->entries].y0
+ obj->size.y;
table->collisions->collision[table->collisions->entries].back_ptr
= obj;
table->collisions->entries++;
}
}
scan++;
}
moves--;
} while (moves != 0);
}
00000000 23 69 6e 63 6c 75 64 65 20 22 50 6f 70 63 6f 72 |#include "Popcor|
00000010 6e 3a 68 2e 50 6f 70 63 6f 72 6e 22 0a 0a 76 6f |n:h.Popcorn"..vo|
00000020 69 64 20 50 6f 70 63 6f 72 6e 5f 50 72 6f 63 65 |id Popcorn_Proce|
00000030 73 73 28 73 74 72 75 63 74 20 6f 62 6a 65 63 74 |ss(struct object|
00000040 5f 74 61 62 6c 65 2a 20 74 61 62 6c 65 2c 20 42 |_table* table, B|
00000050 4f 4f 4c 20 70 6c 6f 74 2c 20 69 6e 74 20 6d 6f |OOL plot, int mo|
00000060 76 65 73 29 0a 7b 0a 20 20 72 65 67 69 73 74 65 |ves).{. registe|
00000070 72 20 69 6e 74 20 20 20 20 20 20 20 20 20 20 73 |r int s|
00000080 63 61 6e 3b 0a 20 20 73 74 72 75 63 74 20 67 61 |can;. struct ga|
00000090 6d 65 5f 6f 62 6a 65 63 74 20 20 20 20 2a 6f 62 |me_object *ob|
000000a0 6a 3b 0a 20 20 75 6e 69 6f 6e 20 6f 62 6a 65 63 |j;. union objec|
000000b0 74 5f 66 6c 61 67 73 20 20 20 20 72 65 61 73 6f |t_flags reaso|
000000c0 6e 3b 0a 0a 20 20 69 66 20 28 74 61 62 6c 65 2d |n;.. if (table-|
000000d0 3e 63 6f 6c 6c 69 73 69 6f 6e 73 20 21 3d 20 4e |>collisions != N|
000000e0 55 4c 4c 29 0a 20 20 20 20 74 61 62 6c 65 2d 3e |ULL). table->|
000000f0 63 6f 6c 6c 69 73 69 6f 6e 73 2d 3e 65 6e 74 72 |collisions->entr|
00000100 69 65 73 20 3d 20 30 3b 0a 0a 20 20 64 6f 0a 20 |ies = 0;.. do. |
00000110 20 7b 0a 20 20 20 20 73 63 61 6e 20 3d 20 30 3b | {. scan = 0;|
00000120 0a 20 20 20 20 77 68 69 6c 65 20 28 73 63 61 6e |. while (scan|
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00000150 20 20 20 20 6f 62 6a 20 3d 20 26 28 74 61 62 6c | obj = &(tabl|
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000001c0 20 20 20 20 20 20 20 7b 0a 20 20 20 20 20 20 20 | {. |
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00000210 65 2d 3e 67 72 61 76 5f 79 3b 0a 20 20 20 20 20 |e->grav_y;. |
00000220 20 20 20 7d 0a 0a 20 20 20 20 20 20 20 20 69 66 | }.. if|
00000230 20 28 6f 62 6a 2d 3e 66 6c 61 67 73 2e 62 69 74 | (obj->flags.bit|
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00000250 20 20 20 20 20 20 7b 0a 20 20 20 20 20 20 20 20 | {. |
00000260 20 20 6f 62 6a 2d 3e 78 3d 6f 62 6a 2d 3e 78 20 | obj->x=obj->x |
00000270 2b 20 6f 62 6a 2d 3e 78 76 3b 0a 20 20 20 20 20 |+ obj->xv;. |
00000280 20 20 20 20 20 6f 62 6a 2d 3e 79 3d 6f 62 6a 2d | obj->y=obj-|
00000290 3e 79 20 2b 20 6f 62 6a 2d 3e 79 76 3b 0a 20 20 |>y + obj->yv;. |
000002a0 20 20 20 20 20 20 7d 0a 0a 20 20 20 20 20 20 20 | }.. |
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000002e0 6a 2d 3e 74 69 6d 65 72 2e 76 61 6c 75 65 20 2d |j->timer.value -|
000002f0 20 6f 62 6a 2d 3e 74 69 6d 65 72 2e 64 65 63 72 | obj->timer.decr|
00000300 65 6d 65 6e 74 3b 0a 0a 20 20 20 20 20 20 20 20 |ement;.. |
00000310 69 66 20 28 6f 62 6a 2d 3e 66 6c 61 67 73 2e 62 |if (obj->flags.b|
00000320 69 74 73 2e 61 74 74 6e 5f 65 76 65 72 79 29 0a |its.attn_every).|
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00000350 20 20 20 20 3d 20 31 3b 0a 20 20 20 20 20 20 20 | = 1;. |
00000360 20 69 66 20 28 6f 62 6a 2d 3e 66 6c 61 67 73 2e | if (obj->flags.|
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00000390 3d 3d 20 31 29 0a 20 20 20 20 20 20 20 20 20 20 |== 1). |
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000003c0 20 20 20 20 20 20 20 69 66 20 28 6f 62 6a 2d 3e | if (obj->|
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000003f0 6d 65 72 2e 76 61 6c 75 65 20 3c 3d 20 30 29 0a |mer.value <= 0).|
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00000420 20 20 20 20 3d 20 31 3b 0a 20 20 20 20 20 20 20 | = 1;. |
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00000470 77 69 6e 64 6f 77 29 29 0a 20 20 20 20 20 20 20 |window)). |
00000480 20 20 20 72 65 61 73 6f 6e 2e 62 69 74 73 2e 61 | reason.bits.a|
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00000710 20 20 20 20 7b 0a 20 20 20 20 20 20 20 20 20 20 | {. |
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00000790 20 6f 62 6a 2d 3e 66 72 61 6d 65 2d 2d 3b 20 6f | obj->frame--; o|
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000007d0 20 20 20 20 20 20 20 20 20 20 7d 0a 20 20 20 20 | }. |
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000007f0 20 20 20 20 20 7b 0a 20 20 20 20 20 20 20 20 20 | {. |
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00000850 20 20 20 20 20 20 20 20 20 20 20 20 20 6f 62 6a | obj|
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00000870 20 20 20 20 20 20 20 7d 0a 20 20 20 20 20 20 20 | }. |
00000880 20 20 20 6f 62 6a 2d 3e 73 69 7a 65 2e 78 20 3d | obj->size.x =|
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000009b0 20 20 20 20 20 20 20 7d 0a 0a 20 20 20 20 20 20 | }.. |
000009c0 20 20 69 66 20 28 6f 62 6a 2d 3e 68 61 6e 64 6c | if (obj->handl|
000009d0 65 72 20 21 3d 20 4e 55 4c 4c 20 26 26 20 72 65 |er != NULL && re|
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00000a00 68 61 6e 64 6c 65 72 29 28 28 76 6f 69 64 2a 29 |handler)((void*)|
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00000a20 4c 4c 29 3b 0a 0a 20 20 20 20 20 20 20 20 69 66 |LL);.. if|
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00000a60 2e 62 69 74 73 2e 61 6e 69 6d 61 74 65 20 26 26 |.bits.animate &&|
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00000b10 6e 63 68 6f 72 2c 0a 20 20 20 20 20 20 20 20 20 |nchor,. |
00000b20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00000b30 20 20 20 20 20 28 6f 62 6a 2d 3e 78 20 3e 3e 20 | (obj->x >> |
00000b40 31 32 29 20 2d 20 28 6f 62 6a 2d 3e 70 6c 6f 74 |12) - (obj->plot|
00000b50 5f 6f 66 66 73 65 74 2e 78 29 2c 0a 20 20 20 20 |_offset.x),. |
00000b60 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00000b70 20 20 20 20 20 20 20 20 20 20 28 6f 62 6a 2d 3e | (obj->|
00000b80 79 20 3e 3e 20 31 32 29 20 2d 20 28 6f 62 6a 2d |y >> 12) - (obj-|
00000b90 3e 70 6c 6f 74 5f 6f 66 66 73 65 74 2e 79 29 20 |>plot_offset.y) |
00000ba0 29 3b 0a 0a 20 20 20 20 20 20 20 20 69 66 20 28 |);.. if (|
00000bb0 6f 62 6a 2d 3e 66 6c 61 67 73 2e 62 69 74 73 2e |obj->flags.bits.|
00000bc0 73 74 64 5f 70 6c 6f 74 20 26 26 20 70 6c 6f 74 |std_plot && plot|
00000bd0 20 26 26 20 21 6f 62 6a 2d 3e 66 6c 61 67 73 2e | && !obj->flags.|
00000be0 62 69 74 73 2e 61 6e 69 6d 61 74 65 20 26 26 20 |bits.animate && |
00000bf0 6d 6f 76 65 73 20 3d 3d 20 31 20 26 26 20 6f 62 |moves == 1 && ob|
00000c00 6a 2d 3e 70 6c 6f 74 5f 69 64 2e 73 70 72 69 74 |j->plot_id.sprit|
00000c10 65 5f 61 6e 63 68 6f 72 20 21 3d 20 4e 55 4c 4c |e_anchor != NULL|
00000c20 29 0a 20 20 20 20 20 20 20 20 20 20 50 6f 70 63 |). Popc|
00000c30 6f 72 6e 5f 50 6c 6f 74 53 70 72 69 74 65 28 2a |orn_PlotSprite(*|
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00000c50 69 74 65 5f 61 6e 63 68 6f 72 2c 0a 20 20 20 20 |ite_anchor,. |
00000c60 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00000c70 20 20 20 20 20 20 20 20 28 6f 62 6a 2d 3e 78 20 | (obj->x |
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00000ca0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00000cb0 20 20 20 20 20 20 20 20 20 20 20 28 6f 62 6a 2d | (obj-|
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00000ce0 20 29 3b 0a 0a 20 20 20 20 20 20 20 20 69 66 20 | );.. if |
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00000d30 7c 7c 20 28 6f 62 6a 2d 3e 66 6c 61 67 73 2e 62 ||| (obj->flags.b|
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00000dc0 77 69 6e 64 6f 77 29 29 0a 20 20 20 20 20 20 20 |window)). |
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00000e10 5f 77 69 6e 64 6f 77 29 29 0a 20 20 20 20 20 20 |_window)). |
00000e20 20 20 20 20 20 29 20 50 6f 70 63 6f 72 6e 5f 44 | ) Popcorn_D|
00000e30 65 6c 65 74 65 4f 62 6a 65 63 74 28 6f 62 6a 29 |eleteObject(obj)|
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00000e70 3e 63 6f 6c 6c 69 73 69 6f 6e 73 20 21 3d 20 4e |>collisions != N|
00000e80 55 4c 4c 20 26 26 20 6f 62 6a 2d 3e 6f 62 6a 65 |ULL && obj->obje|
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00000f20 6f 66 66 73 65 74 2e 78 3b 0a 0a 20 20 20 20 20 |offset.x;.. |
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00000fe0 69 65 73 5d 2e 78 31 0a 20 20 20 20 20 20 20 20 |ies].x1. |
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00001030 0a 20 20 20 20 20 20 20 20 20 20 20 20 2b 20 6f |. + o|
00001040 62 6a 2d 3e 73 69 7a 65 2e 78 3b 0a 0a 20 20 20 |bj->size.x;.. |
00001050 20 20 20 20 20 20 20 74 61 62 6c 65 2d 3e 63 6f | table->co|
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00001070 69 6f 6e 5b 74 61 62 6c 65 2d 3e 63 6f 6c 6c 69 |ion[table->colli|
00001080 73 69 6f 6e 73 2d 3e 65 6e 74 72 69 65 73 5d 2e |sions->entries].|
00001090 79 31 0a 20 20 20 20 20 20 20 20 20 20 20 3d 20 |y1. = |
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000010c0 6c 65 2d 3e 63 6f 6c 6c 69 73 69 6f 6e 73 2d 3e |le->collisions->|
000010d0 65 6e 74 72 69 65 73 5d 2e 79 30 0a 20 20 20 20 |entries].y0. |
000010e0 20 20 20 20 20 20 20 20 2b 20 6f 62 6a 2d 3e 73 | + obj->s|
000010f0 69 7a 65 2e 79 3b 0a 0a 20 20 20 20 20 20 20 20 |ize.y;.. |
00001100 20 20 74 61 62 6c 65 2d 3e 63 6f 6c 6c 69 73 69 | table->collisi|
00001110 6f 6e 73 2d 3e 63 6f 6c 6c 69 73 69 6f 6e 5b 74 |ons->collision[t|
00001120 61 62 6c 65 2d 3e 63 6f 6c 6c 69 73 69 6f 6e 73 |able->collisions|
00001130 2d 3e 65 6e 74 72 69 65 73 5d 2e 62 61 63 6b 5f |->entries].back_|
00001140 70 74 72 0a 20 20 20 20 20 20 20 20 20 20 20 3d |ptr. =|
00001150 20 6f 62 6a 3b 0a 0a 20 20 20 20 20 20 20 20 20 | obj;.. |
00001160 20 74 61 62 6c 65 2d 3e 63 6f 6c 6c 69 73 69 6f | table->collisio|
00001170 6e 73 2d 3e 65 6e 74 72 69 65 73 2b 2b 3b 0a 20 |ns->entries++;. |
00001180 20 20 20 20 20 20 20 7d 0a 20 20 20 20 20 20 7d | }. }|
00001190 0a 20 20 20 20 20 20 73 63 61 6e 2b 2b 3b 0a 20 |. scan++;. |
000011a0 20 20 20 7d 0a 20 20 20 20 6d 6f 76 65 73 2d 2d | }. moves--|
000011b0 3b 0a 20 20 7d 20 77 68 69 6c 65 20 28 6d 6f 76 |;. } while (mov|
000011c0 65 73 20 21 3d 20 30 29 3b 0a 7d 0a |es != 0);.}.|
000011cc 
.