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font.c
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font.c
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/* This file is part of punani-strike
* Copyright (c) 2012 Gianni Tedesco
* Released under the terms of GPLv3
*/
#include <punani/punani.h>
#include <punani/vec.h>
#include <punani/renderer.h>
#include <punani/punani_gl.h>
#include <punani/tex.h>
#include <punani/font.h>
#include <stdarg.h>
struct _font {
texture_t f_tex;
float f_px, f_py;
int f_lists;
};
#define UV_INC (1.0 / 16.0)
font_t font_load(const char *fn, float px, float py)
{
struct _font *f;
unsigned int i;
f = calloc(1, sizeof(*f));
if ( NULL == f )
goto out;
f->f_tex = png_get_by_name(fn);
if ( NULL == f->f_tex )
goto out_free;
f->f_px = px;
f->f_py = py;
f->f_lists = glGenLists(0x100);
texture_bind(f->f_tex);
for (i = 0; i < 0x100; i++) {
float cx = (i % 16) / 16.0f;
float cy = (i / 16) / 16.0f;
glNewList(f->f_lists + i, GL_COMPILE);
glBegin(GL_QUADS);
glTexCoord2f(cx, cy);
glVertex2i(0, 0);
glTexCoord2f(cx + UV_INC, cy);
glVertex2i(px, 0);
glTexCoord2f(cx + UV_INC, cy + UV_INC);
glVertex2i(px, py);
glTexCoord2f(cx, cy + UV_INC);
glVertex2i(0, py);
glEnd();
glTranslated(px, 0, 0);
glEndList();
}
/* success */
goto out;
out_free:
free(f);
f = NULL;
out:
return f;
}
void font_print(font_t f, unsigned int x, unsigned int y, const char *str)
{
float env_color[4];
env_color[0] = 1.0;
env_color[1] = 1.0;
env_color[2] = 1.0;
env_color[3] = 0.1;
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_BLEND);
glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, env_color);
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
glColor4f(0.0, 0.0, 0.0, 1.0);
glPushMatrix();
glTranslated(x, y, 0);
glListBase(f->f_lists);
texture_bind(f->f_tex);
glCallLists(strlen(str), GL_UNSIGNED_BYTE, str);
glPopMatrix();
}
void font_printf(font_t f, unsigned int x, unsigned int y, const char *fmt, ...)
{
static char *abuf;
static size_t abuflen;
int len;
va_list va;
char *new;
again:
va_start(va, fmt);
len = vsnprintf(abuf, abuflen, fmt, va);
if ( len < 0 ) /* bug in old glibc */
len = 0;
if ( (size_t)len < abuflen )
goto done;
new = realloc(abuf, len + 1);
if ( new == NULL )
goto done;
abuf = new;
abuflen = len + 1;
goto again;
done:
font_print(f, x, y, abuf);
va_end(va);
}
void font_get_pitch(font_t f, float *x, float *y) {
if ( NULL != x ) *x = f->f_px;
if ( NULL != y ) *y = f->f_py;
}
void font_free(font_t f)
{
if ( f ) {
texture_put(f->f_tex);
glDeleteLists(f->f_lists, 0x100);
free(f);
}
}