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

typedef struct {
   GLenum mode;
   GLenum format; // 0, GL_T2F_V3F, GL_V2F
   GLint texname;
   unsigned char r, g, b, a;
} rc_key_t;

typedef struct {
   HV *hv;
} rc_t;

typedef SV rc_array_t;

static rc_t *
rc_alloc ()
{
  rc_t *rc = g_slice_new0 (rc_t);
  rc->hv = newHV ();

  return rc;
}

static void
rc_free (rc_t *rc)
{
  SvREFCNT_dec (rc->hv);
  g_slice_free (rc_t, rc);
}

static void
rc_clear (rc_t *rc)
{
  hv_clear (rc->hv);
}

static rc_array_t *
rc_array (rc_t *rc, rc_key_t *k)
{
  SV *sv = *hv_fetch (rc->hv, (char *)k, sizeof (*k), 1);

  if (SvTYPE (sv) != SVt_PV)
    {
      sv_upgrade (sv, SVt_PV);
      SvPOK_only (sv);
    }

  return sv;
}

static void
rc_v2f (rc_array_t *arr, float x, float y)
{
  STRLEN len = SvCUR (arr) + sizeof (float) * 2;
  SvGROW (arr, len);

  ((float *)SvEND (arr))[0] = x;
  ((float *)SvEND (arr))[1] = y;

  SvCUR_set (arr, len);
}

static void
rc_t2f_v3f (rc_array_t *arr, float u, float v, float x, float y, float z)
{
  STRLEN len = SvCUR (arr) + sizeof (float) * 5;
  SvGROW (arr, len);

  ((float *)SvEND (arr))[0] = u;
  ((float *)SvEND (arr))[1] = v;

  ((float *)SvEND (arr))[2] = x;
  ((float *)SvEND (arr))[3] = y;
  ((float *)SvEND (arr))[4] = z;

  SvCUR_set (arr, len);
}

static void
rc_glyph (rc_array_t *arr, int u, int v, int w, int h, int x, int y)
{
  U8 *c;
  STRLEN len = SvCUR (arr);

  SvGROW (arr, len + 2 * 2 + 1 * 4);

  c = (U8 *)SvEND (arr);
  *c++ = u;
  *c++ = v;
  *c++ = w;
  *c++ = h;

  // use ber-encoding for up to 14 bits (16k)
  *c = 0x80 | (x >> 7); c += (x >> 7) ? 1 : 0; *c++ = x & 0x7f;
  *c = 0x80 | (y >> 7); c += (y >> 7) ? 1 : 0; *c++ = y & 0x7f;

  SvCUR_set (arr, c - (U8 *)SvPVX (arr));
}

static void
rc_draw (rc_t *rc)
{
  HE *he;

  hv_iterinit (rc->hv);
  while ((he = hv_iternext (rc->hv)))
    {
      rc_key_t *key = (rc_key_t *)HeKEY (he);
      rc_array_t *arr = HeVAL (he);
      STRLEN len;
      char *arr_pv = SvPV (arr, len);
      GLsizei stride;

      if (key->texname)
        {
          glBindTexture (GL_TEXTURE_2D, key->texname);
          glEnable (GL_TEXTURE_2D);
        }
      else
        glDisable (GL_TEXTURE_2D);

      glColor4ub (key->r, key->g, key->b, key->a);

      if (key->format)
        {
          stride = key->format == GL_T2F_V3F ? sizeof (float) * 5
                 : key->format == GL_V2F     ? sizeof (float) * 2
                 : 65536;

          glInterleavedArrays (key->format, 0, (void *)arr_pv);
          //glLockArraysEXT (0, len / stride);
          glDrawArrays (key->mode, 0, len / stride);
          //glUnlockArraysEXT ();
        }
      else
        {
          // optimised character quad storage. slower but nice on memory.
          // reduces storage requirements from 80 bytes/char to 6-8
          U8 *c = (U8 *)arr_pv;
          U8 *e = c + len;

          glBegin (key->mode); // practically must be quads

          while (c < e)
            {
              int u, v, x, y, w, h;

              u = *c++;
              v = *c++;
              w = *c++;
              h = *c++;

              x = *c++; if (x > 0x7f) x = ((x & 0x7f) << 7) | *c++;
              y = *c++; if (y > 0x7f) y = ((y & 0x7f) << 7) | *c++;

              glTexCoord2f ( u      * (1.f / TC_WIDTH),  v      * (1.f / TC_HEIGHT)); glVertex2i (x    , y    );
              glTexCoord2f ((u + w) * (1.f / TC_WIDTH),  v      * (1.f / TC_HEIGHT)); glVertex2i (x + w, y    );
              glTexCoord2f ((u + w) * (1.f / TC_WIDTH), (v + h) * (1.f / TC_HEIGHT)); glVertex2i (x + w, y + h);
              glTexCoord2f ( u      * (1.f / TC_WIDTH), (v + h) * (1.f / TC_HEIGHT)); glVertex2i (x    , y + h);
            }

          glEnd ();
        }
    }

  glDisable (GL_TEXTURE_2D);
}


Revision:	1.4
Committed:	Sun Aug 12 08:44:22 2007 UTC (18 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+60 -5 lines
Log Message:	use an compressed format for glyph quad vectors. this reduces the size of e.g. the opengl info from 200k to 20k, and typical sizes for labels are now <<100 bytes. the cost is full immediate mode submission of coordinates (cpu), but glInterleavedArrays is likely not much faster and modern cpus probably prefer more decoding over more cache misses.
#	Content
1	typedef struct {
2	GLenum mode;
3	GLenum format; // 0, GL_T2F_V3F, GL_V2F
4	GLint texname;
5	unsigned char r, g, b, a;
6	} rc_key_t;
7
8	typedef struct {
9	HV *hv;
10	} rc_t;
11
12	typedef SV rc_array_t;
13
14	static rc_t *
15	rc_alloc ()
16	{
17	rc_t *rc = g_slice_new0 (rc_t);
18	rc->hv = newHV ();
19
20	return rc;
21	}
22
23	static void
24	rc_free (rc_t *rc)
25	{
26	SvREFCNT_dec (rc->hv);
27	g_slice_free (rc_t, rc);
28	}
29
30	static void
31	rc_clear (rc_t *rc)
32	{
33	hv_clear (rc->hv);
34	}
35
36	static rc_array_t *
37	rc_array (rc_t rc, rc_key_t k)
38	{
39	SV sv = hv_fetch (rc->hv, (char )k, sizeof (k), 1);
40
41	if (SvTYPE (sv) != SVt_PV)
42	{
43	sv_upgrade (sv, SVt_PV);
44	SvPOK_only (sv);
45	}
46
47	return sv;
48	}
49
50	static void
51	rc_v2f (rc_array_t *arr, float x, float y)
52	{
53	STRLEN len = SvCUR (arr) + sizeof (float) * 2;
54	SvGROW (arr, len);
55
56	((float *)SvEND (arr))[0] = x;
57	((float *)SvEND (arr))[1] = y;
58
59	SvCUR_set (arr, len);
60	}
61
62	static void
63	rc_t2f_v3f (rc_array_t *arr, float u, float v, float x, float y, float z)
64	{
65	STRLEN len = SvCUR (arr) + sizeof (float) * 5;
66	SvGROW (arr, len);
67
68	((float *)SvEND (arr))[0] = u;
69	((float *)SvEND (arr))[1] = v;
70
71	((float *)SvEND (arr))[2] = x;
72	((float *)SvEND (arr))[3] = y;
73	((float *)SvEND (arr))[4] = z;
74
75	SvCUR_set (arr, len);
76	}
77
78	static void
79	rc_glyph (rc_array_t *arr, int u, int v, int w, int h, int x, int y)
80	{
81	U8 *c;
82	STRLEN len = SvCUR (arr);
83
84	SvGROW (arr, len + 2 * 2 + 1 * 4);
85
86	c = (U8 *)SvEND (arr);
87	*c++ = u;
88	*c++ = v;
89	*c++ = w;
90	*c++ = h;
91
92	// use ber-encoding for up to 14 bits (16k)
93	c = 0x80 \| (x >> 7); c += (x >> 7) ? 1 : 0; c++ = x & 0x7f;
94	c = 0x80 \| (y >> 7); c += (y >> 7) ? 1 : 0; c++ = y & 0x7f;
95
96	SvCUR_set (arr, c - (U8 *)SvPVX (arr));
97	}
98
99	static void
100	rc_draw (rc_t *rc)
101	{
102	HE *he;
103
104	hv_iterinit (rc->hv);
105	while ((he = hv_iternext (rc->hv)))
106	{
107	rc_key_t key = (rc_key_t )HeKEY (he);
108	rc_array_t *arr = HeVAL (he);
109	STRLEN len;
110	char *arr_pv = SvPV (arr, len);
111	GLsizei stride;
112
113	if (key->texname)
114	{
115	glBindTexture (GL_TEXTURE_2D, key->texname);
116	glEnable (GL_TEXTURE_2D);
117	}
118	else
119	glDisable (GL_TEXTURE_2D);
120
121	glColor4ub (key->r, key->g, key->b, key->a);
122
123	if (key->format)
124	{
125	stride = key->format == GL_T2F_V3F ? sizeof (float) * 5
126	: key->format == GL_V2F ? sizeof (float) * 2
127	: 65536;
128
129	glInterleavedArrays (key->format, 0, (void *)arr_pv);
130	//glLockArraysEXT (0, len / stride);
131	glDrawArrays (key->mode, 0, len / stride);
132	//glUnlockArraysEXT ();
133	}
134	else
135	{
136	// optimised character quad storage. slower but nice on memory.
137	// reduces storage requirements from 80 bytes/char to 6-8
138	U8 c = (U8 )arr_pv;
139	U8 *e = c + len;
140
141	glBegin (key->mode); // practically must be quads
142
143	while (c < e)
144	{
145	int u, v, x, y, w, h;
146
147	u = *c++;
148	v = *c++;
149	w = *c++;
150	h = *c++;
151
152	x = c++; if (x > 0x7f) x = ((x & 0x7f) << 7) \| c++;
153	y = c++; if (y > 0x7f) y = ((y & 0x7f) << 7) \| c++;
154
155	glTexCoord2f ( u * (1.f / TC_WIDTH), v * (1.f / TC_HEIGHT)); glVertex2i (x , y );
156	glTexCoord2f ((u + w) * (1.f / TC_WIDTH), v * (1.f / TC_HEIGHT)); glVertex2i (x + w, y );
157	glTexCoord2f ((u + w) * (1.f / TC_WIDTH), (v + h) * (1.f / TC_HEIGHT)); glVertex2i (x + w, y + h);
158	glTexCoord2f ( u * (1.f / TC_WIDTH), (v + h) * (1.f / TC_HEIGHT)); glVertex2i (x , y + h);
159	}
160
161	glEnd ();
162	}
163	}
164
165	glDisable (GL_TEXTURE_2D);
166	}
167
168
169
170