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#include "video/video.h"
#include "filesystem/path.h"
#include "Nebu_filesystem.h"
#include <stdio.h>
#include <stdlib.h>
// #include <GL/gl.h>
#define NO_SDL_GLEXT
#include "SDL_opengl.h"
#define FTX_ERR "[FontTex error]: "
void getLine(char *buf, int size, file_handle file) {
do {
file_gets(file, buf, size);
} while( buf[0] == '\n' || buf[0] == '#');
}
FontTex *ftxLoadFont(const char *filename) {
char *path;
file_handle file;
char buf[100];
int i;
int len;
FontTex *ftx;
path = getPath(PATH_DATA, filename);
if(path == NULL) {
fprintf(stderr, FTX_ERR "can't load font file '%s'\n", filename);
return NULL;
}
file = file_open(path, "r");
free(path);
/* TODO(5): check for EOF errors in the following code */
/* nTextures, texture width, char width */
ftx = (FontTex*) malloc(sizeof(FontTex));
getLine(buf, sizeof(buf), file);
sscanf(buf, "%d %d %d ", &(ftx->nTextures), &(ftx->texwidth), &(ftx->width));
/* lowest character, highest character */
getLine(buf, sizeof(buf), file);
sscanf(buf, "%d %d ", &(ftx->lower), &(ftx->upper));
/* font name */
getLine(buf, sizeof(buf), file);
len = strlen(buf) + 1;
ftx->fontname = (char*)malloc(len);
memcpy(ftx->fontname, buf, len);
/* prepare space for texture IDs */
ftx->texID = (GLuint*) malloc(ftx->nTextures * sizeof(unsigned int));
glGenTextures(ftx->nTextures, ftx->texID);
/* the individual textures */
for(i = 0; i < ftx->nTextures; i++) {
char *texname;
getLine(buf, sizeof(buf), file);
len = strlen(buf) + 1;
if(buf[len - 2] == '\n') buf[len - 2] = 0;
texname = (char*)malloc(len);
memcpy(texname, buf, len);
glBindTexture(GL_TEXTURE_2D, ftx->texID[i]);
loadTexture(texname, GL_RGBA);
free(texname);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
/* glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); */
/* glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); */
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
}
file_close(file);
return ftx;
}
void ftxUnloadFont(FontTex *ftx) {
glDeleteTextures(ftx->nTextures, ftx->texID);
free(ftx->texID);
free(ftx->fontname);
free(ftx);
}
static int color_base = 48;
static int colors = 8;
enum {
white = 0,
black,
red,
orange,
yellow,
lt_green,
green,
blue_green
};
unsigned char color_codes[][3] = {
{ 255, 255,255 },
{ 0, 0, 0 },
{ 255, 0, 0 },
{ 255, 128, 0 },
{ 255, 255, 0 },
{ 128, 255, 0 },
{ 0, 255, 0 },
{ 0, 255, 128 }
};
/*
0 48 white 65535 65536 65535 FFFFFF
1 49 black 0 0 0 000000
2 50 red 65535 0 0 FF0000
3 51 orange 65535 32768 0 FF8000
4 52 yellow 65535 65535 0 FFFF00
5 53 lt green 32768 65535 0 80FF00
6 54 green 0 65535 0 00FF00
7 55 blue green 0 65535 32768 00FF80
8 56 cyan 0 65535 65535 00FFFF
9 57 lt blue 0 32768 65535 0080FF
: 58 blue 0 0 65535 0000FF
; 59 purple 32768 0 65535 8000FF
< 60 magenta 65535 0 65535 FF00FF
= 61 purple red 65535 0 32768 FF0080
> 62 lt gray 49152 49152 49152 C0C0C0
? 63 dk gray 16384 16384 16384 404040
@ 64 - 32768 0 0 800000
A 65 | 32768 16384 0 804000
B 66 | 32768 32768 0 808000
C 67 | darker 16384 32768 0 408000
D 68 | versions 0 32768 0 008000
E 69 | of 0 32768 16384 008040
F 70 | colors 0 32768 32768 008080
G 71 | 50..61 0 16384 32768 004080
H 72 | 0 0 32768 000080
I 73 | 16384 0 32768 400080
J 74 | 32768 0 32768 800080
K 75 - 32768 0 16384 800040
*/
void ftxRenderString(FontTex *ftx, const char *string, int len) {
int i;
int bound = -1;
int index;
int tex;
int w;
float cw;
float cx, cy;
w = ftx->texwidth / ftx->width;
cw = (float)ftx->width / (float)ftx->texwidth;
for(i = 0; i < len; i++) {
if(string[i] == 3) { /* color code */
i++;
if(i >= len) return;
if(string[i] < color_base && string[i] > color_base + colors) continue;
glColor3ubv(color_codes[ string[i] - color_base ]);
continue;
}
/* find out which texture it's in */
/* TODO(4): find out why the +1 is necessary */
index = string[i] - ftx->lower + 1;
if(index >= ftx->upper)
fprintf(stderr, FTX_ERR " index out of bounds");
tex = index / (w *
w);
/* bind texture */
if(tex != bound) {
glBindTexture(GL_TEXTURE_2D, ftx->texID[tex]);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
bound = tex;
}
/* find texture coordinates */
index = index % (w * w);
cx = (float)(index % w) / (float)w;
cy = (float)(index / w) / (float)w;
/* draw quad */
/* fprintf(stderr, FTX_ERR "coords: tex %d (%.2f, %.2f), %.2f\n", */
/* bound, cx, cy, cw); */
glBegin(GL_QUADS);
glTexCoord2f(cx, 1 - cy - cw);
glVertex2f(i, 0);
glTexCoord2f(cx + cw, 1 - cy - cw);
glVertex2f(i + 1, 0);
glTexCoord2f(cx + cw, 1 - cy);
glVertex2f(i + 1, 1);
glTexCoord2f(cx, 1 - cy);
glVertex2f(i, 1);
glEnd();
}
/* checkGLError("FontTex.c ftxRenderString\n"); */
}
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