cf.schmorp.de/Deliantra-Client/texcache.c

// all these must be powers of two
// width and height better be <=256 as we use bytes in the rendercache
#define TC_WIDTH  256
#define TC_HEIGHT 256
#define TC_ROUND  4

typedef struct {
  GLuint name;
  int x, y, w, h;
} tc_area;

extern int tc_generation;

static void tc_get (tc_area *area, int width, int height);
static void tc_put (tc_area *area);
static void tc_clear (void);
static void tc_backup (void);
static void tc_restore (void);

/////////////////////////////////////////////////////////////////////////////

#include <glib.h>

int tc_generation;

typedef struct tc_texture {
  struct tc_texture *next;
  GLuint name;
  int avail;
  char *saved; /* stores saved texture data */
} tc_texture;

typedef struct tc_slice {
  GLuint name;
  int avail, y;
} tc_slice;

static tc_slice slices[TC_HEIGHT / TC_ROUND];
static tc_texture *first_texture;

void
tc_clear (void)
{
  int i;

  for (i = TC_HEIGHT / TC_ROUND; i--; )
    slices [i].name = 0;

  while (first_texture)
    {
      tc_texture *next = first_texture->next;
      del_texture (first_texture->name);
      g_slice_free (tc_texture, first_texture);
      first_texture = next;
    }

  ++tc_generation;
}

void
tc_backup (void)
{
  tc_texture *tex = first_texture;
  while (tex)
    {
      tex->saved = g_slice_alloc (TC_WIDTH * TC_HEIGHT);

      glBindTexture (GL_TEXTURE_2D, tex->name);
      glGetTexImage (GL_TEXTURE_2D, 0, GL_ALPHA, GL_UNSIGNED_BYTE, tex->saved);

      tex = tex->next;
    }
}

void
tc_restore (void)
{
  tc_texture *tex = first_texture;

  while (tex)
    {
      glBindTexture (GL_TEXTURE_2D, tex->name);
      glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
      glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
      glTexImage2D (GL_TEXTURE_2D, 0, GL_ALPHA, TC_WIDTH, TC_HEIGHT, 0, GL_ALPHA, GL_UNSIGNED_BYTE, tex->saved);

      g_slice_free1 (TC_WIDTH * TC_HEIGHT, tex->saved);
      tex->saved = 0;

      tex = tex->next;
    }
}

void
tc_get (tc_area *area, int width, int height)
{
  int slice_height = MIN (height + TC_ROUND - 1, TC_HEIGHT) & ~(TC_ROUND - 1);
  tc_slice *slice = slices + slice_height / TC_ROUND;

  area->w = width;
  area->h = height;

  width = MIN (width, TC_WIDTH);

  if (!slice->name || slice->avail < width)
    {
      // try to find a texture with enough space
      tc_texture *tex, *match = 0;

      for (tex = first_texture; tex; tex = tex->next)
        if (tex->avail >= slice_height && (!match || match->avail > tex->avail))
          match = tex;

      // create a new texture if necessary
      if (!match)
        {
          match = g_slice_new (tc_texture);
          match->next   = first_texture;
          first_texture = match;
          match->name   = gen_texture ();
          match->avail  = TC_HEIGHT;
          match->saved  = 0;

          glBindTexture (GL_TEXTURE_2D, match->name);
          glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
          glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
          glTexImage2D (GL_TEXTURE_2D, 0, GL_ALPHA, TC_WIDTH, TC_HEIGHT, 0, GL_ALPHA, GL_UNSIGNED_BYTE, 0);
        }

      match->avail -= slice_height;

      slice->name  = match->name;
      slice->avail = TC_WIDTH;
      slice->y     = match->avail;
    }

  slice->avail -= width;

  area->name = slice->name;
  area->x    = slice->avail;
  area->y    = slice->y;
}

void
tc_put (tc_area *area)
{
  // our management is too primitive to support this operation yet
}
Revision:	1.6
Committed:	Tue Dec 25 19:08:31 2007 UTC (18 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-2_03, rel-2_02, rel-0_9965, rel-0_9964, rel-0_9963, rel-2_05, rel-2_04, rel-0_9968, rel-2_0, rel-0_9972, rel-0_9973, rel-0_9974, rel-0_9975, rel-0_9976, rel-0_9977, rel-0_9978, rel-0_9971, rel-0_9967, rel-1_21, rel-0_9966
Changes since 1.5:	+5 -3 lines
Log Message:	staticify
#	Content
1	// all these must be powers of two
2	// width and height better be <=256 as we use bytes in the rendercache
3	#define TC_WIDTH 256
4	#define TC_HEIGHT 256
5	#define TC_ROUND 4
6
7	typedef struct {
8	GLuint name;
9	int x, y, w, h;
10	} tc_area;
11
12	extern int tc_generation;
13
14	static void tc_get (tc_area *area, int width, int height);
15	static void tc_put (tc_area *area);
16	static void tc_clear (void);
17	static void tc_backup (void);
18	static void tc_restore (void);
19
20	/////////////////////////////////////////////////////////////////////////////
21
22	#include <glib.h>
23
24	int tc_generation;
25
26	typedef struct tc_texture {
27	struct tc_texture *next;
28	GLuint name;
29	int avail;
30	char saved; / stores saved texture data */
31	} tc_texture;
32
33	typedef struct tc_slice {
34	GLuint name;
35	int avail, y;
36	} tc_slice;
37
38	static tc_slice slices[TC_HEIGHT / TC_ROUND];
39	static tc_texture *first_texture;
40
41	void
42	tc_clear (void)
43	{
44	int i;
45
46	for (i = TC_HEIGHT / TC_ROUND; i--; )
47	slices [i].name = 0;
48
49	while (first_texture)
50	{
51	tc_texture *next = first_texture->next;
52	del_texture (first_texture->name);
53	g_slice_free (tc_texture, first_texture);
54	first_texture = next;
55	}
56
57	++tc_generation;
58	}
59
60	void
61	tc_backup (void)
62	{
63	tc_texture *tex = first_texture;
64	while (tex)
65	{
66	tex->saved = g_slice_alloc (TC_WIDTH * TC_HEIGHT);
67
68	glBindTexture (GL_TEXTURE_2D, tex->name);
69	glGetTexImage (GL_TEXTURE_2D, 0, GL_ALPHA, GL_UNSIGNED_BYTE, tex->saved);
70
71	tex = tex->next;
72	}
73	}
74
75	void
76	tc_restore (void)
77	{
78	tc_texture *tex = first_texture;
79
80	while (tex)
81	{
82	glBindTexture (GL_TEXTURE_2D, tex->name);
83	glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
84	glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
85	glTexImage2D (GL_TEXTURE_2D, 0, GL_ALPHA, TC_WIDTH, TC_HEIGHT, 0, GL_ALPHA, GL_UNSIGNED_BYTE, tex->saved);
86
87	g_slice_free1 (TC_WIDTH * TC_HEIGHT, tex->saved);
88	tex->saved = 0;
89
90	tex = tex->next;
91	}
92	}
93
94	void
95	tc_get (tc_area *area, int width, int height)
96	{
97	int slice_height = MIN (height + TC_ROUND - 1, TC_HEIGHT) & ~(TC_ROUND - 1);
98	tc_slice *slice = slices + slice_height / TC_ROUND;
99
100	area->w = width;
101	area->h = height;
102
103	width = MIN (width, TC_WIDTH);
104
105	if (!slice->name \|\| slice->avail < width)
106	{
107	// try to find a texture with enough space
108	tc_texture tex, match = 0;
109
110	for (tex = first_texture; tex; tex = tex->next)
111	if (tex->avail >= slice_height && (!match \|\| match->avail > tex->avail))
112	match = tex;
113
114	// create a new texture if necessary
115	if (!match)
116	{
117	match = g_slice_new (tc_texture);
118	match->next = first_texture;
119	first_texture = match;
120	match->name = gen_texture ();
121	match->avail = TC_HEIGHT;
122	match->saved = 0;
123
124	glBindTexture (GL_TEXTURE_2D, match->name);
125	glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
126	glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
127	glTexImage2D (GL_TEXTURE_2D, 0, GL_ALPHA, TC_WIDTH, TC_HEIGHT, 0, GL_ALPHA, GL_UNSIGNED_BYTE, 0);
128	}
129
130	match->avail -= slice_height;
131
132	slice->name = match->name;
133	slice->avail = TC_WIDTH;
134	slice->y = match->avail;
135	}
136
137	slice->avail -= width;
138
139	area->name = slice->name;
140	area->x = slice->avail;
141	area->y = slice->y;
142	}
143
144	void
145	tc_put (tc_area *area)
146	{
147	// our management is too primitive to support this operation yet
148	}