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commandergenius/project/jni/sdl_ttf/glfont.c

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/*
glfont: An example of using the SDL_ttf library with OpenGL.
Copyright (C) 1997-2004 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
The SDL_GL_* functions in this file are available in the public domain.
Sam Lantinga
slouken@libsdl.org
*/
/* $Id: glfont.c 2429 2006-05-14 21:03:44Z slouken $ */
/* A simple program to test the text rendering feature of the TTF library */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "SDL.h"
#include "SDL_ttf.h"
#ifdef HAVE_OPENGL
#include "SDL_opengl.h"
#define DEFAULT_PTSIZE 18
#define DEFAULT_TEXT "The quick brown fox jumped over the lazy dog"
#define NUM_COLORS 256
static char *Usage =
"Usage: %s [-utf8|-unicode] [-b] [-i] [-u] [-fgcol r,g,b] [-bgcol r,g,b] \
<font>.ttf [ptsize] [text]\n";
void SDL_GL_Enter2DMode()
{
SDL_Surface *screen = SDL_GetVideoSurface();
/* Note, there may be other things you need to change,
depending on how you have your OpenGL state set up.
*/
glPushAttrib(GL_ENABLE_BIT);
glDisable(GL_DEPTH_TEST);
glDisable(GL_CULL_FACE);
glEnable(GL_TEXTURE_2D);
/* This allows alpha blending of 2D textures with the scene */
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glViewport(0, 0, screen->w, screen->h);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glOrtho(0.0, (GLdouble)screen->w, (GLdouble)screen->h, 0.0, 0.0, 1.0);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
}
void SDL_GL_Leave2DMode()
{
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glPopAttrib();
}
/* Quick utility function for texture creation */
static int power_of_two(int input)
{
int value = 1;
while ( value < input ) {
value <<= 1;
}
return value;
}
GLuint SDL_GL_LoadTexture(SDL_Surface *surface, GLfloat *texcoord)
{
GLuint texture;
int w, h;
SDL_Surface *image;
SDL_Rect area;
Uint32 saved_flags;
Uint8 saved_alpha;
/* Use the surface width and height expanded to powers of 2 */
w = power_of_two(surface->w);
h = power_of_two(surface->h);
texcoord[0] = 0.0f; /* Min X */
texcoord[1] = 0.0f; /* Min Y */
texcoord[2] = (GLfloat)surface->w / w; /* Max X */
texcoord[3] = (GLfloat)surface->h / h; /* Max Y */
image = SDL_CreateRGBSurface(
SDL_SWSURFACE,
w, h,
32,
#if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */
0x000000FF,
0x0000FF00,
0x00FF0000,
0xFF000000
#else
0xFF000000,
0x00FF0000,
0x0000FF00,
0x000000FF
#endif
);
if ( image == NULL ) {
return 0;
}
/* Save the alpha blending attributes */
saved_flags = surface->flags&(SDL_SRCALPHA|SDL_RLEACCELOK);
saved_alpha = surface->format->alpha;
if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
SDL_SetAlpha(surface, 0, 0);
}
/* Copy the surface into the GL texture image */
area.x = 0;
area.y = 0;
area.w = surface->w;
area.h = surface->h;
SDL_BlitSurface(surface, &area, image, &area);
/* Restore the alpha blending attributes */
if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
SDL_SetAlpha(surface, saved_flags, saved_alpha);
}
/* Create an OpenGL texture for the image */
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D,
0,
GL_RGBA,
w, h,
0,
GL_RGBA,
GL_UNSIGNED_BYTE,
image->pixels);
SDL_FreeSurface(image); /* No longer needed */
return texture;
}
static void cleanup(int exitcode)
{
TTF_Quit();
SDL_Quit();
exit(exitcode);
}
int main(int argc, char *argv[])
{
char *argv0 = argv[0];
SDL_Surface *screen;
TTF_Font *font;
SDL_Surface *text;
int ptsize;
int i, done;
SDL_Color white = { 0xFF, 0xFF, 0xFF, 0 };
SDL_Color black = { 0x00, 0x00, 0x00, 0 };
SDL_Color *forecol;
SDL_Color *backcol;
GLenum gl_error;
GLuint texture;
int x, y, w, h;
GLfloat texcoord[4];
GLfloat texMinX, texMinY;
GLfloat texMaxX, texMaxY;
float color[8][3]= {{ 1.0, 1.0, 0.0},
{ 1.0, 0.0, 0.0},
{ 0.0, 0.0, 0.0},
{ 0.0, 1.0, 0.0},
{ 0.0, 1.0, 1.0},
{ 1.0, 1.0, 1.0},
{ 1.0, 0.0, 1.0},
{ 0.0, 0.0, 1.0}};
float cube[8][3]= {{ 0.5, 0.5, -0.5},
{ 0.5, -0.5, -0.5},
{-0.5, -0.5, -0.5},
{-0.5, 0.5, -0.5},
{-0.5, 0.5, 0.5},
{ 0.5, 0.5, 0.5},
{ 0.5, -0.5, 0.5},
{-0.5, -0.5, 0.5}};
SDL_Event event;
int renderstyle;
int dump;
enum {
RENDER_LATIN1,
RENDER_UTF8,
RENDER_UNICODE
} rendertype;
char *message;
/* Look for special execution mode */
dump = 0;
/* Look for special rendering types */
renderstyle = TTF_STYLE_NORMAL;
rendertype = RENDER_LATIN1;
/* Default is black and white */
forecol = &black;
backcol = &white;
for ( i=1; argv[i] && argv[i][0] == '-'; ++i ) {
if ( strcmp(argv[i], "-utf8") == 0 ) {
rendertype = RENDER_UTF8;
} else
if ( strcmp(argv[i], "-unicode") == 0 ) {
rendertype = RENDER_UNICODE;
} else
if ( strcmp(argv[i], "-b") == 0 ) {
renderstyle |= TTF_STYLE_BOLD;
} else
if ( strcmp(argv[i], "-i") == 0 ) {
renderstyle |= TTF_STYLE_ITALIC;
} else
if ( strcmp(argv[i], "-u") == 0 ) {
renderstyle |= TTF_STYLE_UNDERLINE;
} else
if ( strcmp(argv[i], "-dump") == 0 ) {
dump = 1;
} else
if ( strcmp(argv[i], "-fgcol") == 0 ) {
int r, g, b;
if ( sscanf (argv[++i], "%d,%d,%d", &r, &g, &b) != 3 ) {
fprintf(stderr, Usage, argv0);
return(1);
}
forecol->r = (Uint8)r;
forecol->g = (Uint8)g;
forecol->b = (Uint8)b;
} else
if ( strcmp(argv[i], "-bgcol") == 0 ) {
int r, g, b;
if ( sscanf (argv[++i], "%d,%d,%d", &r, &g, &b) != 3 ) {
fprintf(stderr, Usage, argv0);
return(1);
}
backcol->r = (Uint8)r;
backcol->g = (Uint8)g;
backcol->b = (Uint8)b;
} else {
fprintf(stderr, Usage, argv0);
return(1);
}
}
argv += i;
argc -= i;
/* Check usage */
if ( ! argv[0] ) {
fprintf(stderr, Usage, argv0);
return(1);
}
/* Initialize SDL */
if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
return(2);
}
/* Initialize the TTF library */
if ( TTF_Init() < 0 ) {
fprintf(stderr, "Couldn't initialize TTF: %s\n",SDL_GetError());
SDL_Quit();
return(2);
}
/* Open the font file with the requested point size */
ptsize = 0;
if ( argc > 1 ) {
ptsize = atoi(argv[1]);
}
if ( ptsize == 0 ) {
i = 2;
ptsize = DEFAULT_PTSIZE;
} else {
i = 3;
}
font = TTF_OpenFont(argv[0], ptsize);
if ( font == NULL ) {
fprintf(stderr, "Couldn't load %d pt font from %s: %s\n",
ptsize, argv[0], SDL_GetError());
cleanup(2);
}
TTF_SetFontStyle(font, renderstyle);
if( dump ) {
for( i = 48; i < 123; i++ ) {
SDL_Surface* glyph = NULL;
glyph = TTF_RenderGlyph_Shaded( font, i, *forecol, *backcol );
if( glyph ) {
char outname[64];
sprintf( outname, "glyph-%d.bmp", i );
SDL_SaveBMP( glyph, outname );
}
}
cleanup(0);
}
/* Set a 640x480 video mode */
screen = SDL_SetVideoMode(640, 480, 0, SDL_OPENGL);
if ( screen == NULL ) {
fprintf(stderr, "Couldn't set 640x480 OpenGL mode: %s\n",
SDL_GetError());
cleanup(2);
}
/* Render and center the message */
if ( argc > 2 ) {
message = argv[2];
} else {
message = DEFAULT_TEXT;
}
switch (rendertype) {
case RENDER_LATIN1:
text = TTF_RenderText_Blended(font, message, *forecol);
break;
case RENDER_UTF8:
text = TTF_RenderUTF8_Blended(font, message, *forecol);
break;
case RENDER_UNICODE:
{
/* This doesn't actually work because you can't pass
UNICODE text in via command line, AFAIK, but...
*/
Uint16 unicode_text[BUFSIZ];
int index;
for ( index = 0; (message[0] || message[1]); ++index ) {
unicode_text[index] = ((Uint8 *)message)[0];
unicode_text[index] <<= 8;
unicode_text[index] |= ((Uint8 *)message)[1];
message += 2;
}
text = TTF_RenderUNICODE_Blended(font,
unicode_text, *forecol);
}
break;
default:
text = NULL; /* This shouldn't happen */
break;
}
if ( text == NULL ) {
fprintf(stderr, "Couldn't render text: %s\n", SDL_GetError());
TTF_CloseFont(font);
cleanup(2);
}
x = (screen->w - text->w)/2;
y = (screen->h - text->h)/2;
w = text->w;
h = text->h;
printf("Font is generally %d big, and string is %hd big\n",
TTF_FontHeight(font), text->h);
/* Convert the text into an OpenGL texture */
glGetError();
texture = SDL_GL_LoadTexture(text, texcoord);
if ( (gl_error = glGetError()) != GL_NO_ERROR ) {
/* If this failed, the text may exceed texture size limits */
printf("Warning: Couldn't create texture: 0x%x\n", gl_error);
}
/* Make texture coordinates easy to understand */
texMinX = texcoord[0];
texMinY = texcoord[1];
texMaxX = texcoord[2];
texMaxY = texcoord[3];
/* We don't need the original text surface anymore */
SDL_FreeSurface(text);
/* Initialize the GL state */
glViewport( 0, 0, screen->w, screen->h );
glMatrixMode( GL_PROJECTION );
glLoadIdentity( );
glOrtho( -2.0, 2.0, -2.0, 2.0, -20.0, 20.0 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity( );
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
glShadeModel(GL_SMOOTH);
/* Wait for a keystroke, and blit text on mouse press */
done = 0;
while ( ! done ) {
while ( SDL_PollEvent(&event) ) {
switch (event.type) {
case SDL_MOUSEMOTION:
x = event.motion.x - w/2;
y = event.motion.y - h/2;
break;
case SDL_KEYDOWN:
case SDL_QUIT:
done = 1;
break;
default:
break;
}
}
/* Clear the screen */
glClearColor(1.0, 1.0, 1.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
/* Draw the spinning cube */
glBegin( GL_QUADS );
glColor3fv(color[0]);
glVertex3fv(cube[0]);
glColor3fv(color[1]);
glVertex3fv(cube[1]);
glColor3fv(color[2]);
glVertex3fv(cube[2]);
glColor3fv(color[3]);
glVertex3fv(cube[3]);
glColor3fv(color[3]);
glVertex3fv(cube[3]);
glColor3fv(color[4]);
glVertex3fv(cube[4]);
glColor3fv(color[7]);
glVertex3fv(cube[7]);
glColor3fv(color[2]);
glVertex3fv(cube[2]);
glColor3fv(color[0]);
glVertex3fv(cube[0]);
glColor3fv(color[5]);
glVertex3fv(cube[5]);
glColor3fv(color[6]);
glVertex3fv(cube[6]);
glColor3fv(color[1]);
glVertex3fv(cube[1]);
glColor3fv(color[5]);
glVertex3fv(cube[5]);
glColor3fv(color[4]);
glVertex3fv(cube[4]);
glColor3fv(color[7]);
glVertex3fv(cube[7]);
glColor3fv(color[6]);
glVertex3fv(cube[6]);
glColor3fv(color[5]);
glVertex3fv(cube[5]);
glColor3fv(color[0]);
glVertex3fv(cube[0]);
glColor3fv(color[3]);
glVertex3fv(cube[3]);
glColor3fv(color[4]);
glVertex3fv(cube[4]);
glColor3fv(color[6]);
glVertex3fv(cube[6]);
glColor3fv(color[1]);
glVertex3fv(cube[1]);
glColor3fv(color[2]);
glVertex3fv(cube[2]);
glColor3fv(color[7]);
glVertex3fv(cube[7]);
glEnd( );
/* Rotate the cube */
glMatrixMode(GL_MODELVIEW);
glRotatef(5.0, 1.0, 1.0, 1.0);
/* Show the text on the screen */
SDL_GL_Enter2DMode();
glBindTexture(GL_TEXTURE_2D, texture);
glBegin(GL_TRIANGLE_STRIP);
glTexCoord2f(texMinX, texMinY); glVertex2i(x, y );
glTexCoord2f(texMaxX, texMinY); glVertex2i(x+w, y );
glTexCoord2f(texMinX, texMaxY); glVertex2i(x, y+h);
glTexCoord2f(texMaxX, texMaxY); glVertex2i(x+w, y+h);
glEnd();
SDL_GL_Leave2DMode();
/* Swap the buffers so everything is visible */
SDL_GL_SwapBuffers( );
}
TTF_CloseFont(font);
cleanup(0);
/* Not reached, but fixes compiler warnings */
return 0;
}
#else /* HAVE_OPENGL */
int main(int argc, char *argv[])
{
printf("No OpenGL support on this system\n");
return 1;
}
#endif /* HAVE_OPENGL */
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