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#include <string.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include "demolib_prefs.h"
#if DEMOLIB_OPENGL_FONT_TTF
#include <ft2build.h>
#include FT_FREETYPE_H
#include "fontttf.h"
#include "../exception.h"
#include "packer/file.h"
#ifdef WIN32
#include <windows.h>
#endif
#include <GL/gl.h>
#include <GL/glu.h>
#ifndef M_PI
#define M_PI 3.141592653589793238462643383279502
#endif
#define PIXMAP_HEIGHT 128
#define PIXMAP_BASE 96
#define SCALE_FACTOR 0.5f
FontTTF::FontTTF(File *ttffile, const char *text, int size)
{
if (FT_Init_FreeType(&library))
throw new FatalException("FreeType init failed.");
if (FT_New_Memory_Face(library, (FT_Byte *)ttffile->get_data(),
ttffile->data_length(), 0, &face))
throw new FatalException("Face opening failed.");
if (FT_Set_Char_Size(face, 0, (int)(size * (64.0f/SCALE_FACTOR)), 96, 96))
throw new FatalException("Size set failed.");
realwidth = width = draw_text(text, false);
/* now round up to closest power-of-two */
for (int i = 0; i < 31; i++) {
if (width <= (1 << i)) {
width = 1 << i;
break;
}
}
texmap = (unsigned char *)(malloc(width * PIXMAP_HEIGHT));
if (texmap == NULL)
throw new FatalException("Out of memory!");
memset(texmap, 0, width * PIXMAP_HEIGHT);
draw_text(text, true);
FT_Done_Face(face);
FT_Done_FreeType(library);
/* now see if we need to scale down to fit the card :-( */
GLint texwidth = width;
GLint maxwidth;
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxwidth);
while (texwidth > maxwidth) {
/* scale down in the X res only -- everybody supports 32x32 ;-) */
texwidth >>= 1;
unsigned char *texmap_s = (unsigned char *)malloc(texwidth * PIXMAP_HEIGHT);
if (texmap_s == NULL)
throw new FatalException("Out of memory!");
for (int y = 0; y < PIXMAP_HEIGHT; y++) {
unsigned char *src = texmap + y * (texwidth * 2);
unsigned char *dst = texmap_s + y * texwidth;
for (int x = 0; x < texwidth; x++) {
unsigned int s1 = (unsigned int)(*src++);
unsigned int s2 = (unsigned int)(*src++);
*dst++ = (unsigned char)((s1 + s2) >> 1);
}
}
free(texmap);
texmap = texmap_s;
}
/*
* bah, GL_ALPHA gives us RGB=0,0,0 and we want RGB=1,1,1... have
* to make the RGB part ourselves. :-)
*/
unsigned char *texptr = (unsigned char *)malloc(texwidth * PIXMAP_HEIGHT * 2);
unsigned char *inptr = texmap, *outptr = texptr;
if (texptr == NULL)
throw new FatalException("Out of memory!");
for (int i = 0; i < texwidth * PIXMAP_HEIGHT; i++) {
*outptr++ = 255;
*outptr++ = *inptr++;
}
glGenTextures(1, &texnum);
glBindTexture(GL_TEXTURE_2D, texnum);
gluBuild2DMipmaps(GL_TEXTURE_2D, GL_LUMINANCE8_ALPHA8, texwidth, PIXMAP_HEIGHT, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, texptr);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
free(texptr);
free(texmap);
}
FontTTF::~FontTTF()
{
glDeleteTextures(1, &texnum);
}
void FontTTF::draw_object(float xpos, float ypos,
float red, float green, float blue,
float alpha, bool additive)
{
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glOrtho(0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 10.0f);
glDisable(GL_DEPTH_TEST);
glDisable(GL_LIGHTING);
glEnable(GL_BLEND);
if (additive) {
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
} else {
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
glBindTexture(GL_TEXTURE_2D, this->texnum);
glEnable(GL_TEXTURE_2D);
glScalef(DEMOLIB_YASPECT / DEMOLIB_XASPECT, 1.0f, 1.0f);
glTranslatef(xpos + (float)((256.0f/SCALE_FACTOR) - width) / (256.0f/SCALE_FACTOR) * 0.4f, ypos, 0.0f);
glColor4f(red, green, blue, alpha);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 1.0f);
glVertex3f(0.0f, 0.2f, 0.0f);
glTexCoord2f(1.0f, 1.0f);
glVertex3f(0.8f * ((float)width / (256.0f/SCALE_FACTOR)), 0.2f, 0.0f);
glTexCoord2f(1.0f, 0.0f);
glVertex3f(0.8f * ((float)width / (256.0f/SCALE_FACTOR)), 0.0f, 0.0f);
glTexCoord2f(0.0f, 0.0f);
glVertex3f(0.0f, 0.0f, 0.0f);
glEnd();
glDisable(GL_TEXTURE_2D);
glDisable(GL_BLEND);
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
}
int FontTTF::draw_text(const char *str, bool real_render)
{
FT_GlyphSlot slot = face->glyph;
int x = 0;
/* center the text */
if (real_render) x = (this->width - this->realwidth) / 2;
for (unsigned int i = 0; i < strlen(str); i++) {
if (FT_Load_Char(face, str[i], FT_LOAD_RENDER))
continue;
if (real_render) {
FT_Bitmap *bm = &(slot->bitmap);
for (int y = 0; y < bm->rows; y++) {
if (PIXMAP_BASE - slot->bitmap_top + y < 0 ||
PIXMAP_BASE - slot->bitmap_top + y >= PIXMAP_HEIGHT) continue;
memcpy(texmap + (PIXMAP_BASE - slot->bitmap_top + y) * width + x + slot->bitmap_left,
bm->buffer + y * bm->width,
bm->width);
}
}
x += slot->advance.x >> 6;
}
return x;
}
#endif
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