mirror of https://github.com/BOINC/boinc.git
613 lines
16 KiB
C++
613 lines
16 KiB
C++
// Copyright (c) Mark J. Kilgard, 1997.
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// This program is freely distributable without licensing fees and is
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// provided without guarantee or warrantee expressed or implied.
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// This program is -not- in the public domain.
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#if defined(_WIN32)
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#pragma warning (disable:4244) // disable bogus conversion warnings
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#endif
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#include <assert.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#ifdef _WIN32
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#include <windows.h>
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#endif
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#ifdef _WIN32
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#include <GL/gl.h>
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#endif
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#ifdef __APPLE_CC__
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#include <OpenGL/gl.h>
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#endif
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#include "texfont.h"
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const char *font_names [] =
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{
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"Helvetica.txf", // 0. This is the default
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"Helvetica-Bold.txf", // 1
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"Helvetica-Oblique.txf", // 2
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"Helvetica-BoldOblique.txf", // 3
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"AvantGarde-Book.txf", // 4
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"AvantGarde-BookOblique.txf", // 5
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"AvantGarde-Demi.txf", // 6
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"AvantGarde-DemiOblique.txf", // 7
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"Bookman-Light.txf", // 8
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"Bookman-LightItalic.txf", // 9
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"Bookman-Demi.txf", // 10
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"Bookman-DemiItalic.txf", // 11
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"Courier.txf", // 12
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"Courier-Bold.txf", // 13
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"Courier-Oblique.txf", // 14
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"Courier-BoldOblique.txf", // 15
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"NewCenturySchlbk-Roman.txf", // 16
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"NewCenturySchlbk-Italic.txf", // 17
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"NewCenturySchlbk-Bold.txf", // 18
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"NewCenturySchlbk-BoldItalic.txf", // 19
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"Palatino-Roman.txf", // 20
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"Palatino-Italic.txf", // 21
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"Palatino-Bold.txf", // 22
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"Palatino-BoldItalic.txf", // 23
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"Times-Roman.txf", // 24
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"Times-Italic.txf", // 25
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"Times-Bold.txf", // 26
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"Times-BoldItalic.txf", // 27
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"ZapfChancery-MediumItalic.txf", // 28
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NULL
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} ;
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#if 1
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// Uncomment to debug various scenarios.
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#undef GL_VERSION_1_1
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#undef GL_EXT_texture_object
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#undef GL_EXT_texture
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#endif
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#ifndef GL_VERSION_1_1
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# if defined(GL_EXT_texture_object)
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# define glGenTextures glGenTexturesEXT
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# define glBindTexture glBindTextureEXT
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# else
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// Without OpenGL 1.1 or the texture object extension, use display lists.
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# define USE_DISPLAY_LISTS
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# endif
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# if defined(GL_EXT_texture)
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# define GL_INTENSITY4 GL_INTENSITY4_EXT
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int useLuminanceAlpha = 0;
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# else
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// Intensity texture format not in OpenGL 1.0; added by the EXT_texture
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// extension and now part of OpenGL 1.1.
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int useLuminanceAlpha = 1;
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# endif
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#else
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// OpenGL 1.1 case.
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int useLuminanceAlpha = 0;
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#endif
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// byte swap a 32-bit value
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#define SWAPL(x, n) { \
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n = ((char *) (x))[0];\
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((char *) (x))[0] = ((char *) (x))[3];\
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((char *) (x))[3] = n;\
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n = ((char *) (x))[1];\
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((char *) (x))[1] = ((char *) (x))[2];\
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((char *) (x))[2] = n; }
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// byte swap a short
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#define SWAPS(x, n) { \
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n = ((char *) (x))[0];\
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((char *) (x))[0] = ((char *) (x))[1];\
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((char *) (x))[1] = n; }
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static TexGlyphVertexInfo * getTCVI(TexFont * txf, int c){
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TexGlyphVertexInfo *tgvi;
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// Automatically substitute uppercase letters with lowercase if not
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// uppercase available (and vice versa).
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if ((c >= txf->min_glyph) && (c < txf->min_glyph + txf->range)) {
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tgvi = txf->lut[c - txf->min_glyph];
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if (tgvi) {
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return tgvi;
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}
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if (islower(c)) {
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c = toupper(c);
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if ((c >= txf->min_glyph) && (c < txf->min_glyph + txf->range)) {
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return txf->lut[c - txf->min_glyph];
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}
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}
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if (isupper(c)) {
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c = tolower(c);
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if ((c >= txf->min_glyph) && (c < txf->min_glyph + txf->range)) {
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return txf->lut[c - txf->min_glyph];
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}
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}
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}
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fprintf(stderr, "texfont: tried to access unavailable font character \"%c\" (%d)\n",isprint(c) ? c : ' ', c);
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abort();
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// NOT REACHED
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return NULL;
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}
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static char *lastError;
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char * txfErrorString(void) {
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return lastError;
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}
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TexFont * txfLoadFont(const char *filename) {
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TexFont *txf;
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FILE *file;
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GLfloat w, h, xstep, ystep;
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char fileid[4], tmp;
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unsigned char *texbitmap;
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int min_glyph, max_glyph;
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int endianness, swap, format, stride, width, height;
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int i, j;
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unsigned long got;
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txf = NULL;
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file = fopen(filename, "rb");
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if (file == NULL) {
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lastError = "file open failed.";
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goto error;
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}
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txf = (TexFont *) malloc(sizeof(TexFont));
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if (txf == NULL) {
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lastError = "out of memory.";
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goto error;
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}
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// For easy cleanup in error case.
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txf->tgi = NULL;
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txf->tgvi = NULL;
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txf->lut = NULL;
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txf->teximage = NULL;
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got = (unsigned long)fread(fileid, 1, 4, file);
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if (got != 4 || strncmp(fileid, "\377txf", 4)) {
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lastError = "not a texture font file.";
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goto error;
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}
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// CONSTANT CONDITION
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assert(sizeof(int) == 4); // Ensure external file format size.
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got = (unsigned long)fread(&endianness, sizeof(int), 1, file);
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if (got == 1 && endianness == 0x12345678) {
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swap = 0;
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} else if (got == 1 && endianness == 0x78563412) {
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swap = 1;
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} else {
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lastError = "not a texture font file.";
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goto error;
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}
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#define EXPECT(n) if (got != (unsigned long) n) { lastError = "premature end of file."; goto error; }
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got = (unsigned long)fread(&format, sizeof(int), 1, file);
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EXPECT(1);
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got = (unsigned long)fread(&txf->tex_width, sizeof(int), 1, file);
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EXPECT(1);
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got = (unsigned long)fread(&txf->tex_height, sizeof(int), 1, file);
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EXPECT(1);
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got = (unsigned long)fread(&txf->max_ascent, sizeof(int), 1, file);
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EXPECT(1);
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got = (unsigned long)fread(&txf->max_descent, sizeof(int),1, file);
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EXPECT(1);
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got = (unsigned long)fread(&txf->num_glyphs, sizeof(int), 1, file);
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EXPECT(1);
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if (swap) {
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SWAPL(&format, tmp);
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SWAPL(&txf->tex_width, tmp);
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SWAPL(&txf->tex_height, tmp);
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SWAPL(&txf->max_ascent, tmp);
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SWAPL(&txf->max_descent,tmp);
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SWAPL(&txf->num_glyphs, tmp);
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}
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txf->tgi = (TexGlyphInfo *) malloc(txf->num_glyphs * sizeof(TexGlyphInfo));
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if (txf->tgi == NULL) {
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lastError = "out of memory.";
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goto error;
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}
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// CONSTANT CONDITION
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assert(sizeof(TexGlyphInfo) == 12); // Ensure external file format size.
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got = (unsigned long)fread(txf->tgi, sizeof(TexGlyphInfo), txf->num_glyphs, file);
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EXPECT(txf->num_glyphs);
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if (swap) {
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for (i = 0; i < txf->num_glyphs; i++) {
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SWAPS(&txf->tgi[i].c, tmp);
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SWAPS(&txf->tgi[i].x, tmp);
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SWAPS(&txf->tgi[i].y, tmp);
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}
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}
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txf->tgvi = (TexGlyphVertexInfo *)
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malloc(txf->num_glyphs * sizeof(TexGlyphVertexInfo));
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if (txf->tgvi == NULL) {
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lastError = "out of memory.";
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goto error;
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}
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w = txf->tex_width;
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h = txf->tex_height;
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xstep = 0.5 / w;
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ystep = 0.5 / h;
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for (i = 0; i < txf->num_glyphs; i++) {
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TexGlyphInfo *tgi;
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tgi = &txf->tgi[i];
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txf->tgvi[i].t0[0] = tgi->x / w + xstep;
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txf->tgvi[i].t0[1] = tgi->y / h + ystep;
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txf->tgvi[i].v0[0] = tgi->xoffset;
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txf->tgvi[i].v0[1] = tgi->yoffset;
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txf->tgvi[i].t1[0] = (tgi->x + tgi->width) / w + xstep;
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txf->tgvi[i].t1[1] = tgi->y / h + ystep;
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txf->tgvi[i].v1[0] = tgi->xoffset + tgi->width;
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txf->tgvi[i].v1[1] = tgi->yoffset;
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txf->tgvi[i].t2[0] = (tgi->x + tgi->width) / w + xstep;
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txf->tgvi[i].t2[1] = (tgi->y + tgi->height) / h + ystep;
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txf->tgvi[i].v2[0] = tgi->xoffset + tgi->width;
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txf->tgvi[i].v2[1] = tgi->yoffset + tgi->height;
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txf->tgvi[i].t3[0] = tgi->x / w + xstep;
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txf->tgvi[i].t3[1] = (tgi->y + tgi->height) / h + ystep;
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txf->tgvi[i].v3[0] = tgi->xoffset;
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txf->tgvi[i].v3[1] = tgi->yoffset + tgi->height;
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txf->tgvi[i].advance = tgi->advance;
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}
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min_glyph = txf->tgi[0].c;
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max_glyph = txf->tgi[0].c;
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for (i = 1; i < txf->num_glyphs; i++) {
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if (txf->tgi[i].c < min_glyph) {
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min_glyph = txf->tgi[i].c;
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}
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if (txf->tgi[i].c > max_glyph) {
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max_glyph = txf->tgi[i].c;
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}
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}
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txf->min_glyph = min_glyph;
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txf->range = max_glyph - min_glyph + 1;
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txf->lut = (TexGlyphVertexInfo **)
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calloc(txf->range, sizeof(TexGlyphVertexInfo *));
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if (txf->lut == NULL) {
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lastError = "out of memory.";
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goto error;
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}
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for (i = 0; i < txf->num_glyphs; i++) {
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txf->lut[txf->tgi[i].c - txf->min_glyph] = &txf->tgvi[i];
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}
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switch (format) {
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case TXF_FORMAT_BYTE:
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if (useLuminanceAlpha) {
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unsigned char *orig;
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orig = (unsigned char *) malloc(txf->tex_width * txf->tex_height);
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if (orig == NULL) {
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lastError = "out of memory.";
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goto error;
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}
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got = (unsigned long)fread(orig, 1, txf->tex_width * txf->tex_height, file);
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EXPECT(txf->tex_width * txf->tex_height);
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txf->teximage = (unsigned char *)
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malloc(2 * txf->tex_width * txf->tex_height);
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if (txf->teximage == NULL) {
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lastError = "out of memory.";
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goto error;
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}
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for (i = 0; i < txf->tex_width * txf->tex_height; i++) {
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txf->teximage[i * 2] = orig[i];
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txf->teximage[i * 2 + 1] = orig[i];
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}
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free(orig);
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}
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else {
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txf->teximage = (unsigned char *)
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malloc(txf->tex_width * txf->tex_height);
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if (txf->teximage == NULL) {
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lastError = "out of memory.";
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goto error;
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}
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got = (unsigned long)fread(txf->teximage, 1, txf->tex_width * txf->tex_height, file);
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EXPECT(txf->tex_width * txf->tex_height);
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}
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break;
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case TXF_FORMAT_BITMAP:
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width = txf->tex_width;
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height = txf->tex_height;
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stride = (width + 7) >> 3;
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texbitmap = (unsigned char *) malloc(stride * height);
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if (texbitmap == NULL) {
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lastError = "out of memory.";
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goto error;
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}
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got = (unsigned long)fread(texbitmap, 1, stride * height, file);
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EXPECT(stride * height);
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if (useLuminanceAlpha) {
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txf->teximage = (unsigned char *) calloc(width * height * 2, 1);
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if (txf->teximage == NULL) {
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lastError = "out of memory.";
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goto error;
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}
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for (i = 0; i < height; i++) {
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for (j = 0; j < width; j++) {
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if (texbitmap[i * stride + (j >> 3)] & (1 << (j & 7))) {
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txf->teximage[(i * width + j) * 2] = 255;
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txf->teximage[(i * width + j) * 2 + 1] = 255;
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}
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}
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}
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}
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else {
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txf->teximage = (unsigned char *) calloc(width * height, 1);
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if (txf->teximage == NULL) {
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lastError = "out of memory.";
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goto error;
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}
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for (i = 0; i < height; i++) {
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for (j = 0; j < width; j++) {
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if (texbitmap[i * stride + (j >> 3)] & (1 << (j & 7))) {
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txf->teximage[i * width + j] = 255;
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}
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}
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}
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}
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free(texbitmap);
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break;
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}
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fclose(file);
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return txf;
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error:
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if (txf) {
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if (txf->tgi) free(txf->tgi);
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if (txf->tgvi)free(txf->tgvi);
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if (txf->lut) free(txf->lut);
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if (txf->teximage) free(txf->teximage);
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free(txf);
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}
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if (file) fclose(file);
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return NULL;
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}
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GLuint CreateTexFont(TexFont * txf,GLuint texobj, GLboolean setupMipmaps){
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glGenTextures(1, &txf->texobj);
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glBindTexture(GL_TEXTURE_2D, txf->texobj);
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#if 1
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// XXX Indigo2 IMPACT in IRIX 5.3 and 6.2 does not support the GL_INTENSITY
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// internal texture format. Sigh. Win32 non-GLX users should disable this code.
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if (useLuminanceAlpha == 0) {
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char *vendor, *renderer, *version;
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renderer = (char *) glGetString(GL_RENDERER);
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vendor = (char *) glGetString(GL_VENDOR);
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if (!strcmp(vendor, "SGI") && !strncmp(renderer, "IMPACT", 6)) {
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version = (char *) glGetString(GL_VERSION);
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if (!strcmp(version, "1.0 Irix 6.2") || !strcmp(version, "1.0 Irix 5.3")) {
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unsigned char *latex;
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int width = txf->tex_width;
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int height = txf->tex_height;
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int i;
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useLuminanceAlpha = 1;
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latex = (unsigned char *) calloc(width * height * 2, 1);
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// XXX unprotected alloc.
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for (i = 0; i < height * width; i++) {
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latex[i * 2] = txf->teximage[i];
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latex[i * 2 + 1] = txf->teximage[i];
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}
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free(txf->teximage);
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txf->teximage = latex;
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}
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}
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}
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#endif
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if (useLuminanceAlpha) {
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if (setupMipmaps) {
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gluBuild2DMipmaps(GL_TEXTURE_2D, GL_LUMINANCE_ALPHA,
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txf->tex_width, txf->tex_height,
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GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, txf->teximage);
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}
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else {
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glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE_ALPHA,
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txf->tex_width, txf->tex_height, 0,
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GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, txf->teximage);
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}
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}
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else {
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#if defined(GL_VERSION_1_1) || defined(GL_EXT_texture)
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// Use GL_INTENSITY4 as internal texture format since we want to use as
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// little texture memory as possible.
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if (setupMipmaps) {
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gluBuild2DMipmaps(GL_TEXTURE_2D, GL_INTENSITY4,
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txf->tex_width, txf->tex_height,
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GL_LUMINANCE, GL_UNSIGNED_BYTE, txf->teximage);
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}
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else {
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glTexImage2D(GL_TEXTURE_2D, 0, GL_INTENSITY4,
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txf->tex_width, txf->tex_height, 0,
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GL_LUMINANCE, GL_UNSIGNED_BYTE, txf->teximage);
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}
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#endif
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}
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return txf->texobj;
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}
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void txfUnloadFont(TexFont * txf){
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if (txf->teximage) {
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free(txf->teximage);
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}
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free(txf->tgi);
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free(txf->tgvi);
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free(txf->lut);
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free(txf);
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}
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void txfGetStringMetrics(
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TexFont * txf,
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char *string,
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int len,
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int *width,
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int *max_ascent,
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int *max_descent){
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TexGlyphVertexInfo *tgvi;
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int w, i;
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w = 0;
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for (i = 0; i < len; i++) {
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if (string[i] == 27) {
|
|
switch (string[i + 1]) {
|
|
case 'M': i += 4; break;
|
|
case 'T': i += 7; break;
|
|
case 'L': i += 7; break;
|
|
case 'F': i += 13;break;
|
|
}
|
|
}
|
|
else {
|
|
tgvi = getTCVI(txf, string[i]);
|
|
w += (int)tgvi->advance;
|
|
}
|
|
}
|
|
*width = w;
|
|
*max_ascent = txf->max_ascent;
|
|
*max_descent = txf->max_descent;
|
|
}
|
|
|
|
|
|
void txfRenderGlyph(TexFont * txf, int c){
|
|
TexGlyphVertexInfo *tgvi;
|
|
tgvi = getTCVI(txf, c);
|
|
glBegin(GL_QUADS);
|
|
glTexCoord2fv(tgvi->t0);
|
|
glVertex2sv(tgvi->v0);
|
|
glTexCoord2fv(tgvi->t1);
|
|
glVertex2sv(tgvi->v1);
|
|
glTexCoord2fv(tgvi->t2);
|
|
glVertex2sv(tgvi->v2);
|
|
glTexCoord2fv(tgvi->t3);
|
|
glVertex2sv(tgvi->v3);
|
|
glEnd();
|
|
glTranslatef(tgvi->advance, 0.0, 0.0);
|
|
}
|
|
|
|
|
|
void txfRenderString(TexFont * txf, char *string, int len){
|
|
int i;
|
|
for (i = 0; i < len; i++) {
|
|
txfRenderGlyph(txf, string[i]);
|
|
}
|
|
}
|
|
|
|
|
|
enum {
|
|
MONO, TOP_BOTTOM, LEFT_RIGHT, FOUR
|
|
};
|
|
|
|
|
|
void txfRenderFancyString( TexFont * txf, char *string, int len){
|
|
TexGlyphVertexInfo *tgvi;
|
|
GLubyte c[4][3];
|
|
int mode = MONO;
|
|
int i;
|
|
for (i = 0; i < len; i++) {
|
|
if (string[i] == 27) {
|
|
switch (string[i + 1]) {
|
|
case 'M':
|
|
mode = MONO;
|
|
glColor3ubv((GLubyte *) & string[i + 2]);
|
|
i += 4;
|
|
break;
|
|
case 'T':
|
|
mode = TOP_BOTTOM;
|
|
memcpy(c, &string[i + 2], 6);
|
|
i += 7;
|
|
break;
|
|
case 'L':
|
|
mode = LEFT_RIGHT;
|
|
memcpy(c, &string[i + 2], 6);
|
|
i += 7;
|
|
break;
|
|
case 'F':
|
|
mode = FOUR;
|
|
memcpy(c, &string[i + 2], 12);
|
|
i += 13;
|
|
break;
|
|
}
|
|
}
|
|
else {
|
|
switch (mode) {
|
|
case MONO:
|
|
txfRenderGlyph(txf, string[i]);
|
|
break;
|
|
case TOP_BOTTOM:
|
|
tgvi = getTCVI(txf, string[i]);
|
|
glBegin(GL_QUADS);
|
|
glColor3ubv(c[0]);
|
|
glTexCoord2fv(tgvi->t0);
|
|
glVertex2sv(tgvi->v0);
|
|
glTexCoord2fv(tgvi->t1);
|
|
glVertex2sv(tgvi->v1);
|
|
glColor3ubv(c[1]);
|
|
glTexCoord2fv(tgvi->t2);
|
|
glVertex2sv(tgvi->v2);
|
|
glTexCoord2fv(tgvi->t3);
|
|
glVertex2sv(tgvi->v3);
|
|
glEnd();
|
|
glTranslatef(tgvi->advance, 0.0, 0.0);
|
|
break;
|
|
case LEFT_RIGHT:
|
|
tgvi = getTCVI(txf, string[i]);
|
|
glBegin(GL_QUADS);
|
|
glColor3ubv(c[0]);
|
|
glTexCoord2fv(tgvi->t0);
|
|
glVertex2sv(tgvi->v0);
|
|
glColor3ubv(c[1]);
|
|
glTexCoord2fv(tgvi->t1);
|
|
glVertex2sv(tgvi->v1);
|
|
glColor3ubv(c[1]);
|
|
glTexCoord2fv(tgvi->t2);
|
|
glVertex2sv(tgvi->v2);
|
|
glColor3ubv(c[0]);
|
|
glTexCoord2fv(tgvi->t3);
|
|
glVertex2sv(tgvi->v3);
|
|
glEnd();
|
|
glTranslatef(tgvi->advance, 0.0, 0.0);
|
|
break;
|
|
case FOUR:
|
|
tgvi = getTCVI(txf, string[i]);
|
|
glBegin(GL_QUADS);
|
|
glColor3ubv(c[0]);
|
|
glTexCoord2fv(tgvi->t0);
|
|
glVertex2sv(tgvi->v0);
|
|
glColor3ubv(c[1]);
|
|
glTexCoord2fv(tgvi->t1);
|
|
glVertex2sv(tgvi->v1);
|
|
glColor3ubv(c[2]);
|
|
glTexCoord2fv(tgvi->t2);
|
|
glVertex2sv(tgvi->v2);
|
|
glColor3ubv(c[3]);
|
|
glTexCoord2fv(tgvi->t3);
|
|
glVertex2sv(tgvi->v3);
|
|
glEnd();
|
|
glTranslatef(tgvi->advance, 0.0, 0.0);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
int txfInFont(TexFont * txf, int c) {
|
|
// NOTE: No uppercase/lowercase substituion.
|
|
if ((c >= txf->min_glyph) && (c < txf->min_glyph + txf->range)) {
|
|
if (txf->lut[c - txf->min_glyph]) {
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|