1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/utktext.cc	Tue Oct 26 08:49:09 2010 +0300
     1.3 @@ -0,0 +1,444 @@
     1.4 +#include <math.h>
     1.5 +#include <ctype.h>
     1.6 +#define GL_GLEXT_PROTOTYPES
     1.7 +#if defined(__APPLE__) && defined(__MACH__)
     1.8 +#include <GLUT/glut.h>
     1.9 +#else
    1.10 +#include <GL/glut.h>
    1.11 +#endif
    1.12 +#include <ft2build.h>
    1.13 +#include FT_FREETYPE_H
    1.14 +#include <vmath.h>
    1.15 +#include "utktext.h"
    1.16 +#include "utk_common.h"
    1.17 +
    1.18 +#ifndef GL_BGRA
    1.19 +#define GL_BGRA	0x80E1
    1.20 +#endif
    1.21 +
    1.22 +#ifndef GL_ABGR
    1.23 +#define GL_ABGR	0x8000
    1.24 +#endif
    1.25 +
    1.26 +#ifdef UTK_BIG_ENDIAN
    1.27 +#define PIXFMT	GL_ABGR
    1.28 +#else
    1.29 +#define PIXFMT	GL_BGRA
    1.30 +#endif
    1.31 +
    1.32 +#define MAX_CHARS		128
    1.33 +#define MAX_IMG_WIDTH	1024
    1.34 +#define SIZE_PIXELS(x)	((x) / 64)
    1.35 +
    1.36 +struct Font {
    1.37 +	unsigned int tex_id;
    1.38 +	float scale;	// this compensates if a higher res font is loaded in its stead, with a new CreateFont
    1.39 +	float line_adv;	// vertical advance to go to the next line
    1.40 +	struct {
    1.41 +		Vector2 pos, size;		// glyph position (from origin) and size in normalized coords [0, 1]
    1.42 +		float advance;			// advance in normalized coords
    1.43 +		Vector2 tc_pos, tc_sz;	// tex coord box pos/size
    1.44 +	} glyphs[MAX_CHARS];
    1.45 +};
    1.46 +
    1.47 +static void BlitFontGlyph(Font *fnt, int x, int y, FT_GlyphSlot glyph, unsigned int *img, int xsz, int ysz);
    1.48 +static void CleanUp();
    1.49 +
    1.50 +static FT_Library ft;
    1.51 +static Vector2 text_pos;
    1.52 +static float text_size = 1.0;
    1.53 +static Color text_color;
    1.54 +static Font *act_fnt;
    1.55 +
    1.56 +#if !defined(GLIBC) && !defined(__GLIBC__)
    1.57 +float log2(float x) {
    1.58 +	float res = 0.0;
    1.59 +	while(x > 1.0) {
    1.60 +		x /= 2.0;
    1.61 +		res += 1.0;
    1.62 +	}
    1.63 +	return res;
    1.64 +}
    1.65 +#endif	// _MSC_VER
    1.66 +
    1.67 +
    1.68 +static inline int NextPow2(int x)
    1.69 +{
    1.70 +	float lg2 = log2((float)x);
    1.71 +	return (int)pow(2.0f, (int)ceil(lg2));
    1.72 +}
    1.73 +
    1.74 +
    1.75 +unsigned int CreateFont(const char *fname, int font_size)
    1.76 +{
    1.77 +	if(!ft) {
    1.78 +		if(FT_Init_FreeType(&ft) != 0) {
    1.79 +			fprintf(stderr, "failed to initialize freetype\n");
    1.80 +			return 0;
    1.81 +		}
    1.82 +		atexit(CleanUp);
    1.83 +	}
    1.84 +
    1.85 +	FT_Face face;
    1.86 +	if(FT_New_Face(ft, fname, 0, &face) != 0) {
    1.87 +		fprintf(stderr, "failed to load font: %s\n", fname);
    1.88 +		return 0;
    1.89 +	}
    1.90 +
    1.91 +	FT_Set_Pixel_Sizes(face, 0, font_size);
    1.92 +
    1.93 +	Font *fnt = new Font;
    1.94 +	int max_width = MAX_CHARS * SIZE_PIXELS(face->bbox.xMax - face->bbox.xMin);
    1.95 +	int foo_xsz = MAX_IMG_WIDTH;
    1.96 +	int foo_ysz = SIZE_PIXELS(face->bbox.yMax - face->bbox.yMin) * max_width / foo_xsz;
    1.97 +
    1.98 +	int tex_xsz = NextPow2(foo_xsz);
    1.99 +	int tex_ysz = NextPow2(foo_ysz);
   1.100 +
   1.101 +	unsigned int *img;
   1.102 +	img = new unsigned int[tex_xsz * tex_ysz];
   1.103 +	memset(img, 0, tex_xsz * tex_ysz * sizeof *img);
   1.104 +
   1.105 +	extern int xsz, ysz;
   1.106 +	int vport_xsz = xsz, vport_ysz = ysz;
   1.107 +
   1.108 +	int max_glyph_y = 0;
   1.109 +	int max_glyph_x = 0;
   1.110 +	for(int i=0; i<MAX_CHARS; i++) {
   1.111 +		FT_Load_Char(face, i, 0);
   1.112 +		int width = SIZE_PIXELS(face->glyph->metrics.width);
   1.113 +		int height = SIZE_PIXELS(face->glyph->metrics.height);
   1.114 +		
   1.115 +		if(height > max_glyph_y) {
   1.116 +			max_glyph_y = height;
   1.117 +		}
   1.118 +
   1.119 +		if(width > max_glyph_x) {
   1.120 +			max_glyph_x = width;
   1.121 +		}
   1.122 +	}
   1.123 +
   1.124 +	int gx = 0, gy = 0;
   1.125 +	for(int i=0; i<MAX_CHARS; i++) {
   1.126 +		FT_Load_Char(face, i, FT_LOAD_RENDER);
   1.127 +		FT_GlyphSlot g = face->glyph;
   1.128 +
   1.129 +		int gwidth = SIZE_PIXELS(g->metrics.width);
   1.130 +		int gheight = SIZE_PIXELS(g->metrics.height);
   1.131 +
   1.132 +		if(gx > MAX_IMG_WIDTH - gwidth) {
   1.133 +			gx = 0;
   1.134 +			gy += max_glyph_y;
   1.135 +		}
   1.136 +
   1.137 +		BlitFontGlyph(fnt, gx, gy, g, img, tex_xsz, tex_ysz);
   1.138 +		fnt->scale = 1.0;
   1.139 +		fnt->line_adv = (float)SIZE_PIXELS(g->metrics.vertAdvance) / (float)vport_ysz;
   1.140 +		fnt->glyphs[i].tc_pos.x = (float)gx / (float)tex_xsz;
   1.141 +		fnt->glyphs[i].tc_pos.y = (float)gy / (float)tex_ysz;
   1.142 +		fnt->glyphs[i].tc_sz.x = (float)gwidth / (float)tex_xsz;
   1.143 +		fnt->glyphs[i].tc_sz.y = (float)gheight / (float)tex_ysz;
   1.144 +		fnt->glyphs[i].size.x = (float)gwidth / (float)vport_xsz;
   1.145 +		fnt->glyphs[i].size.y = (float)gheight / (float)vport_ysz;
   1.146 +		fnt->glyphs[i].pos.x = (float)SIZE_PIXELS(g->metrics.horiBearingX) / (float)vport_xsz;
   1.147 +		fnt->glyphs[i].pos.y = -(float)SIZE_PIXELS(g->metrics.horiBearingY) / (float)vport_ysz;
   1.148 +		fnt->glyphs[i].advance = (float)SIZE_PIXELS(g->metrics.horiAdvance) / (float)vport_xsz;
   1.149 +
   1.150 +		gx += gwidth;
   1.151 +	}
   1.152 +
   1.153 +	FT_Done_Face(face);
   1.154 +
   1.155 +	glGenTextures(1, &fnt->tex_id);
   1.156 +	glBindTexture(GL_TEXTURE_2D, fnt->tex_id);
   1.157 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
   1.158 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
   1.159 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
   1.160 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
   1.161 +	glTexImage2D(GL_TEXTURE_2D, 0, 4, tex_xsz, tex_ysz, 0, PIXFMT, GL_UNSIGNED_BYTE, img);
   1.162 +
   1.163 +#ifdef DUMP_FONT_IMG
   1.164 +	FILE *fp;
   1.165 +	unsigned int *ptr = img;
   1.166 +
   1.167 +	if((fp = fopen("fnt.ppm", "wb"))) {
   1.168 +		fprintf(fp, "P6\n%d %d\n255\n", tex_xsz, tex_ysz);
   1.169 +
   1.170 +		for(int i=0; i<tex_xsz * tex_ysz; i++) {
   1.171 +			fputc((*ptr >> 24) & 0xff, fp);
   1.172 +			fputc((*ptr >> 24) & 0xff, fp);
   1.173 +			fputc((*ptr >> 24) & 0xff, fp);
   1.174 +			ptr++;
   1.175 +		}
   1.176 +		fclose(fp);
   1.177 +	}
   1.178 +#endif
   1.179 +	
   1.180 +	delete [] img;
   1.181 +
   1.182 +	act_fnt = fnt;
   1.183 +
   1.184 +	return 1;
   1.185 +}
   1.186 +
   1.187 +void DeleteFont(unsigned int fid)
   1.188 +{
   1.189 +}
   1.190 +
   1.191 +unsigned int GetFont(const char *fname, int sz)
   1.192 +{
   1.193 +	return 1;
   1.194 +}
   1.195 +
   1.196 +bool BindFont(unsigned int fid)
   1.197 +{
   1.198 +	return true;
   1.199 +}
   1.200 +
   1.201 +void SetTextPos(const Vector2 &pos)
   1.202 +{
   1.203 +	text_pos = pos;
   1.204 +}
   1.205 +
   1.206 +Vector2 GetTextPos()
   1.207 +{
   1.208 +	return text_pos;
   1.209 +}
   1.210 +
   1.211 +void TextLineAdvance(int adv)
   1.212 +{
   1.213 +	text_pos.y += (float)adv * act_fnt->line_adv;
   1.214 +}
   1.215 +
   1.216 +void TextCRet()
   1.217 +{
   1.218 +	text_pos.x = 0.0;
   1.219 +}
   1.220 +
   1.221 +void SetTextSize(float sz)
   1.222 +{
   1.223 +	text_size = sz;
   1.224 +}
   1.225 +
   1.226 +float GetTextSize()
   1.227 +{
   1.228 +	return text_size;
   1.229 +}
   1.230 +
   1.231 +void SetTextColor(const Color &col)
   1.232 +{
   1.233 +	text_color = col;
   1.234 +}
   1.235 +
   1.236 +Color GetTextColor()
   1.237 +{
   1.238 +	return text_color;
   1.239 +}
   1.240 +
   1.241 +static void ImOverlay(const Vector2 &v1, const Vector2 &v2, const Color &col, unsigned int tex)
   1.242 +{
   1.243 +	float l = v1.x * 2.0f - 1.0f;
   1.244 +	float r = v2.x * 2.0f - 1.0f;
   1.245 +	float u = -v1.y * 2.0f + 1.0f;
   1.246 +	float d = -v2.y * 2.0f + 1.0f;
   1.247 +
   1.248 +	glMatrixMode(GL_PROJECTION);
   1.249 +	glPushMatrix();
   1.250 +	glLoadIdentity();
   1.251 +	glMatrixMode(GL_MODELVIEW);
   1.252 +	glPushMatrix();
   1.253 +	glLoadIdentity();
   1.254 +
   1.255 +	glBindTexture(GL_TEXTURE_2D, tex);
   1.256 +
   1.257 +	glDisable(GL_DEPTH_TEST);
   1.258 +	glDisable(GL_LIGHTING);
   1.259 +	glDisable(GL_CULL_FACE);
   1.260 +
   1.261 +	glBegin(GL_QUADS);
   1.262 +	glColor4f(col.r, col.g, col.b, col.a);
   1.263 +	glTexCoord2f(0, 0);
   1.264 +	glVertex2f(l, u);
   1.265 +	glTexCoord2f(1, 0);
   1.266 +	glVertex2f(r, u);
   1.267 +	glTexCoord2f(1, 1);
   1.268 +	glVertex2f(r, d);
   1.269 +	glTexCoord2f(0, 1);
   1.270 +	glVertex2f(l, d);
   1.271 +	glEnd();
   1.272 +
   1.273 +	glEnable(GL_LIGHTING);
   1.274 +	glEnable(GL_DEPTH_TEST);
   1.275 +
   1.276 +	glMatrixMode(GL_PROJECTION);
   1.277 +	glPopMatrix();
   1.278 +	glMatrixMode(GL_MODELVIEW);
   1.279 +	glPopMatrix();
   1.280 +}
   1.281 +
   1.282 +float PrintChar(char c)
   1.283 +{
   1.284 +	// get texture coordinates for the glyph, and construct the texture matrix
   1.285 +	float tx = act_fnt->glyphs[(int)c].tc_pos.x;
   1.286 +	float ty = act_fnt->glyphs[(int)c].tc_pos.y;
   1.287 +	float sx = act_fnt->glyphs[(int)c].tc_sz.x;
   1.288 +	float sy = act_fnt->glyphs[(int)c].tc_sz.y;
   1.289 +
   1.290 +	float mat[] = {
   1.291 +		sx, 0, tx, 0,
   1.292 +		0, sy, ty, 0,
   1.293 +		0, 0, 1, 0,
   1.294 +		0, 0, 0, 1
   1.295 +	};
   1.296 +
   1.297 +	glMatrixMode(GL_TEXTURE);
   1.298 +	glPushMatrix();
   1.299 +	glLoadMatrixf(mat);
   1.300 +
   1.301 +	Vector2 pos = text_pos + act_fnt->glyphs[(int)c].pos * act_fnt->scale;
   1.302 +	ImOverlay(pos, pos + act_fnt->glyphs[(int)c].size * act_fnt->scale, text_color, act_fnt->tex_id);
   1.303 +
   1.304 +	glMatrixMode(GL_TEXTURE);
   1.305 +	glPopMatrix();
   1.306 +
   1.307 +	return act_fnt->glyphs[(int)c].advance * act_fnt->scale;
   1.308 +}
   1.309 +
   1.310 +// this function contains the preamble of all block text drawing functions (i.e. not printchar above)
   1.311 +static void PreDraw()
   1.312 +{
   1.313 +	glMatrixMode(GL_PROJECTION);
   1.314 +	glPushMatrix();
   1.315 +	/*glLoadTransposeMatrixf(OrthoProj(2, 2, 0, 10).m);*/
   1.316 +	glLoadIdentity();
   1.317 +	glMatrixMode(GL_MODELVIEW);
   1.318 +	glPushMatrix();
   1.319 +	glLoadIdentity();
   1.320 +	glMatrixMode(GL_TEXTURE);
   1.321 +	glPushMatrix();
   1.322 +	glLoadIdentity();
   1.323 +
   1.324 +	glEnable(GL_TEXTURE_2D);
   1.325 +	glBindTexture(GL_TEXTURE_2D, act_fnt->tex_id);
   1.326 +
   1.327 +	glBegin(GL_QUADS);
   1.328 +	glColor4f(text_color.r, text_color.g, text_color.b, text_color.a);
   1.329 +}
   1.330 +
   1.331 +static void PostDraw()
   1.332 +{
   1.333 +	glEnd();
   1.334 +
   1.335 +	glDisable(GL_TEXTURE_2D);
   1.336 +
   1.337 +	glMatrixMode(GL_TEXTURE);
   1.338 +	glPopMatrix();
   1.339 +	glMatrixMode(GL_MODELVIEW);
   1.340 +	glPopMatrix();
   1.341 +	glMatrixMode(GL_PROJECTION);
   1.342 +	glPopMatrix();
   1.343 +}
   1.344 +
   1.345 +float PrintString(const char *str, bool standalone)
   1.346 +{
   1.347 +	if(standalone) PreDraw();
   1.348 +	
   1.349 +	float start_x = text_pos.x;
   1.350 +	while(*str) {
   1.351 +		float tx = act_fnt->glyphs[(int)*str].tc_pos.x;
   1.352 +		float ty = act_fnt->glyphs[(int)*str].tc_pos.y;
   1.353 +		float sx = act_fnt->glyphs[(int)*str].tc_sz.x;
   1.354 +		float sy = act_fnt->glyphs[(int)*str].tc_sz.y;
   1.355 +
   1.356 +		Vector2 tc1 = Vector2(tx, ty);
   1.357 +		Vector2 tc2 = Vector2(tx + sx, ty + sy);
   1.358 +
   1.359 +		Vector2 v1 = text_pos + act_fnt->glyphs[(int)*str].pos * act_fnt->scale * text_size;
   1.360 +		Vector2 v2 = v1 + act_fnt->glyphs[(int)*str].size * act_fnt->scale * text_size;
   1.361 +		float l = v1.x * 2.0f - 1.0f;
   1.362 +		float r = v2.x * 2.0f - 1.0f;
   1.363 +		float u = -v1.y * 2.0f + 1.0f;
   1.364 +		float d = -v2.y * 2.0f + 1.0f;
   1.365 +
   1.366 +		glTexCoord2f(tc1.x, tc1.y);
   1.367 +		glVertex2f(l, u);
   1.368 +		glTexCoord2f(tc2.x, tc1.y);
   1.369 +		glVertex2f(r, u);
   1.370 +		glTexCoord2f(tc2.x, tc2.y);
   1.371 +		glVertex2f(r, d);
   1.372 +		glTexCoord2f(tc1.x, tc2.y);
   1.373 +		glVertex2f(l, d);
   1.374 +
   1.375 +		text_pos.x += act_fnt->glyphs[(int)*str++].advance * act_fnt->scale * text_size;
   1.376 +	}
   1.377 +
   1.378 +	if(standalone) PostDraw();
   1.379 +	return text_pos.x - start_x;
   1.380 +}
   1.381 +
   1.382 +void PrintStringLines(const char **str, int lines)
   1.383 +{
   1.384 +	PreDraw();
   1.385 +
   1.386 +	while(lines-- > 0) {
   1.387 +		PrintString(*str++, false);
   1.388 +		TextLineAdvance();
   1.389 +		TextCRet();
   1.390 +	}
   1.391 +
   1.392 +	PostDraw();
   1.393 +}
   1.394 +
   1.395 +static void BlitFontGlyph(Font *fnt, int x, int y, FT_GlyphSlot glyph, unsigned int *img, int xsz, int ysz)
   1.396 +{
   1.397 +	if(glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY) {
   1.398 +		fprintf(stderr, "BlitFontGlyph: unsupported pixel mode: %d\n", glyph->bitmap.pixel_mode);
   1.399 +		return;
   1.400 +	}
   1.401 +
   1.402 +	unsigned int *dest = img + y * xsz + x;
   1.403 +	unsigned char *src = glyph->bitmap.buffer;
   1.404 +
   1.405 +	for(int j=0; j<glyph->bitmap.rows; j++) {
   1.406 +		for(int i=0; i<glyph->bitmap.width; i++) {
   1.407 +			dest[i] = 0x00ffffff | ((unsigned int)src[i] << 24);
   1.408 +		}
   1.409 +		dest += xsz;
   1.410 +		src += glyph->bitmap.pitch;
   1.411 +	}
   1.412 +}
   1.413 +
   1.414 +static void CleanUp()
   1.415 +{
   1.416 +	FT_Done_FreeType(ft);
   1.417 +}
   1.418 +
   1.419 +float GetMaxDescent()
   1.420 +{
   1.421 +	Font *fnt = act_fnt;
   1.422 +
   1.423 +	float max_descent = 0.0f;
   1.424 +	
   1.425 +	for(int i=0; i<MAX_CHARS; i++) {
   1.426 +		float des = fnt->glyphs[i].pos.y + fnt->glyphs[i].size.y;
   1.427 +		if(isprint(i) && des > max_descent) {
   1.428 +			max_descent = des;
   1.429 +		}
   1.430 +	}
   1.431 +
   1.432 +	return max_descent;
   1.433 +}
   1.434 +
   1.435 +float GetLineAdvance()
   1.436 +{
   1.437 +	return act_fnt->line_adv;
   1.438 +}
   1.439 +
   1.440 +float GetTextWidth(const char *str)
   1.441 +{
   1.442 +	float width = 0;
   1.443 +	while(*str) {
   1.444 +		width += act_fnt->glyphs[(int)*str++].advance * act_fnt->scale * text_size;
   1.445 +	}
   1.446 +	return width;
   1.447 +}