deliantra/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
tex_backup (tc_texture *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);
}

void
tex_restore (tc_texture *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;
}

void
tc_backup (void)
{
  tc_texture *tex;
  
  for (tex = first_texture; tex; tex = tex->next)
    tex_backup (tex);
}

void
tc_restore (void)
{
  tc_texture *tex;
  
  for (tex = first_texture; tex; tex = tex->next)
    tex_restore (tex);
}

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:	1.7
Committed:	Thu Nov 26 07:19:11 2009 UTC (14 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.6:	+27 -22 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	// all these must be powers of two
2	root	1.4	// width and height better be <=256 as we use bytes in the rendercache
3	root	1.1	#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	root	1.2	extern int tc_generation;
13
14	root	1.6	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	root	1.1
20			/////////////////////////////////////////////////////////////////////////////
21
22			#include <glib.h>
23
24	root	1.2	int tc_generation;
25
26	root	1.1	typedef struct tc_texture {
27			struct tc_texture *next;
28			GLuint name;
29			int avail;
30	root	1.5	char saved; / stores saved texture data */
31	root	1.1	} 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	root	1.5	tc_clear (void)
43	root	1.1	{
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	root	1.3	del_texture (first_texture->name);
53	root	1.1	g_slice_free (tc_texture, first_texture);
54			first_texture = next;
55			}
56	root	1.2
57			++tc_generation;
58	root	1.1	}
59
60			void
61	root	1.7	tex_backup (tc_texture *tex)
62	root	1.5	{
63	root	1.7	tex->saved = g_slice_alloc (TC_WIDTH * TC_HEIGHT);
64	root	1.5
65	root	1.7	glBindTexture (GL_TEXTURE_2D, tex->name);
66			glGetTexImage (GL_TEXTURE_2D, 0, GL_ALPHA, GL_UNSIGNED_BYTE, tex->saved);
67	root	1.5	}
68
69			void
70	root	1.7	tex_restore (tc_texture *tex)
71	root	1.5	{
72	root	1.7	glBindTexture (GL_TEXTURE_2D, tex->name);
73			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
74			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
75			glTexImage2D (GL_TEXTURE_2D, 0, GL_ALPHA, TC_WIDTH, TC_HEIGHT, 0, GL_ALPHA, GL_UNSIGNED_BYTE, tex->saved);
76	root	1.5
77	root	1.7	g_slice_free1 (TC_WIDTH * TC_HEIGHT, tex->saved);
78			tex->saved = 0;
79			}
80	root	1.5
81	root	1.7	void
82			tc_backup (void)
83			{
84			tc_texture *tex;
85
86			for (tex = first_texture; tex; tex = tex->next)
87			tex_backup (tex);
88			}
89	root	1.5
90	root	1.7	void
91			tc_restore (void)
92			{
93			tc_texture *tex;
94
95			for (tex = first_texture; tex; tex = tex->next)
96			tex_restore (tex);
97	root	1.5	}
98
99			void
100	root	1.1	tc_get (tc_area *area, int width, int height)
101			{
102			int slice_height = MIN (height + TC_ROUND - 1, TC_HEIGHT) & ~(TC_ROUND - 1);
103			tc_slice *slice = slices + slice_height / TC_ROUND;
104
105			area->w = width;
106			area->h = height;
107
108			width = MIN (width, TC_WIDTH);
109
110			if (!slice->name \|\| slice->avail < width)
111			{
112			// try to find a texture with enough space
113			tc_texture tex, match = 0;
114
115			for (tex = first_texture; tex; tex = tex->next)
116			if (tex->avail >= slice_height && (!match \|\| match->avail > tex->avail))
117			match = tex;
118
119			// create a new texture if necessary
120			if (!match)
121			{
122			match = g_slice_new (tc_texture);
123	root	1.5	match->next = first_texture;
124	root	1.1	first_texture = match;
125	root	1.5	match->name = gen_texture ();
126			match->avail = TC_HEIGHT;
127			match->saved = 0;
128	root	1.1
129			glBindTexture (GL_TEXTURE_2D, match->name);
130			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
131			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
132			glTexImage2D (GL_TEXTURE_2D, 0, GL_ALPHA, TC_WIDTH, TC_HEIGHT, 0, GL_ALPHA, GL_UNSIGNED_BYTE, 0);
133			}
134
135			match->avail -= slice_height;
136
137			slice->name = match->name;
138			slice->avail = TC_WIDTH;
139			slice->y = match->avail;
140			}
141
142			slice->avail -= width;
143
144			area->name = slice->name;
145			area->x = slice->avail;
146			area->y = slice->y;
147			}
148
149			void
150			tc_put (tc_area *area)
151			{
152			// our management is too primitive to support this operation yet
153			}