1 /* -*- Mode: C; indent-tabs-mode: t; tab-width: 4 -*-
2 // ---------------------------------------------------------------------------
4 // Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
5 // ---------------------------------------------------------------------------
6 // SquirrelJME is under the Mozilla Public License Version 2.0.
7 // See license.mkd for licensing and copyright information.
8 // -------------------------------------------------------------------------*/
10 #include "sjme/modelessStars.h"
12 sjme_errorCode
sjme_modelessStars(
13 sjme_attrInOutNotNull sjme_modelessStarState
* state
,
14 sjme_attrInNotNull
uint32_t* buf
,
15 sjme_attrInPositiveNonZero sjme_jint width
,
16 sjme_attrInPositiveNonZero sjme_jint height
,
17 sjme_attrInPositiveNonZero sjme_jint pitch
,
18 sjme_attrInValue sjme_jint tick
)
20 sjme_modelessStar
* modelessStar
;
22 sjme_modelessStarColor colors
[SJME_NUM_MODELESS_STAR_COLOR_IDS
];
23 sjme_modelessStarColor
* startColor
;
24 sjme_modelessStarColor
* endColor
;
25 sjme_modelessStarColor
* atColor
;
26 sjme_modelessStarColor
* sliceColor
;
27 sjme_jint h
, y
, x
, next
;
30 /* Make sure input values are fine. */
31 if (state
== NULL
|| buf
== NULL
|| width
<= 0 || height
<= 0 ||
33 return SJME_ERROR_INVALID_ARGUMENT
;
35 /* Easier pointers. */
36 startColor
= &colors
[SJME_MODELESS_STAR_COLOR_ID_START
];
37 endColor
= &colors
[SJME_MODELESS_STAR_COLOR_ID_END
];
38 atColor
= &colors
[SJME_MODELESS_STAR_COLOR_ID_AT
];
39 sliceColor
= &colors
[SJME_MODELESS_STAR_COLOR_ID_SLICE
];
41 /* Set base color information. */
42 startColor
->xrgb
[0] = 0x00 << SJME_MODELESS_STAR_COLOR_SHIFT
;
43 startColor
->xrgb
[1] = 0x5B << SJME_MODELESS_STAR_COLOR_SHIFT
;
44 startColor
->xrgb
[2] = 0xCE << SJME_MODELESS_STAR_COLOR_SHIFT
;
45 startColor
->xrgb
[3] = 0xFA << SJME_MODELESS_STAR_COLOR_SHIFT
;
46 endColor
->xrgb
[0] = 0x00 << SJME_MODELESS_STAR_COLOR_SHIFT
;
47 endColor
->xrgb
[1] = 0xF5 << SJME_MODELESS_STAR_COLOR_SHIFT
;
48 endColor
->xrgb
[2] = 0xA9 << SJME_MODELESS_STAR_COLOR_SHIFT
;
49 endColor
->xrgb
[3] = 0xB8 << SJME_MODELESS_STAR_COLOR_SHIFT
;
51 /* Set middle color. */
52 for (x
= 0; x
< 4; x
++)
54 /* Set starting color. */
58 /* Set slice color. */
59 if (endColor
->xrgb
[x
] != startColor
->xrgb
[x
])
60 sliceColor
->xrgb
[x
] = (endColor
->xrgb
[x
] -
61 startColor
->xrgb
[x
]) / height
;
63 sliceColor
->xrgb
[x
] = 0;
66 /* Draw in each color slice. */
67 for (h
= 0; h
< height
; h
++)
69 /* Determine where to draw in the slice. */
70 bufSlice
= &buf
[pitch
* h
];
72 /* Determine the actual color hex. */
74 for (x
= 0; x
< 4; x
++)
77 rawHex
|= (atColor
->xrgb
[x
] >>
78 SJME_MODELESS_STAR_COLOR_SHIFT
) & 0xFF;
81 /* Just set it all to that color. */
82 for (x
= 0; x
< width
; x
++)
85 /* Shift color closer. */
86 for (x
= 0; x
< 4; x
++)
88 /* If already at this color, do not go there. */
89 next
= atColor
->xrgb
[x
];
90 if (next
== endColor
->xrgb
[x
])
93 /* Determine next color. */
94 next
+= sliceColor
->xrgb
[x
];
96 /* Make sure color stays in bounds. */
99 else if (next
< 0x000000)
102 /* Go to this color. */
103 atColor
->xrgb
[x
] = next
;
107 /* Draw random star positions. */
108 for (h
= 0; h
< SJME_MODELESS_STAR_COUNT
; h
++)
111 modelessStar
= &state
->modelessStars
[h
];
113 /* Does this star need to be initialized? */
114 if (modelessStar
->shining
== SJME_JNI_FALSE
)
116 /* Not creating stars yet, and is not shining. */
117 if (state
->lockStarCreation
> 0)
119 /* Count down though... */
120 state
->lockStarCreation
--;
125 /* Star is shining now. */
126 modelessStar
->shining
= SJME_JNI_TRUE
;
128 /* Set random position on the screen. */
129 if (state
->latchedFirstGo
)
130 modelessStar
->x
= width
- 1;
132 modelessStar
->x
= rand() % width
;
133 modelessStar
->y
= rand() % height
;
135 /* Set a random speed for the star. */
136 modelessStar
->speed
= (rand() % 4) + 1;
138 /* Do not initialize another star just yet. */
139 state
->lockStarCreation
= (tick
% 25) + (rand() % 50);
140 state
->lockStarCreationLast
= state
->lockStarCreation
;
143 /* Move star to the left. */
144 modelessStar
->x
-= modelessStar
->speed
;
146 /* Did the star fall off the screen? */
147 if (modelessStar
->x
< 0)
149 modelessStar
->shining
= SJME_JNI_FALSE
;
151 /* Do not draw this star. */
158 buf
[(pitch
* y
) + x
] = 0x00FFFFFF;
160 /* Do this step again to tick some more? */
161 if (!state
->latchedFirstGo
)
166 /* No longer the first go. */
167 state
->latchedFirstGo
= SJME_JNI_TRUE
;
171 /* Handled successfully. */
172 return SJME_JNI_TRUE
;