/* ========================================================================= * Freetype GL - A C OpenGL Freetype engine * Platform: Any * WWW: http://code.google.com/p/freetype-gl/ * ------------------------------------------------------------------------- * Copyright 2011,2012 Nicolas P. Rougier. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY NICOLAS P. ROUGIER ''AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO * EVENT SHALL NICOLAS P. ROUGIER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * The views and conclusions contained in the software and documentation are * those of the authors and should not be interpreted as representing official * policies, either expressed or implied, of Nicolas P. Rougier. * ========================================================================= * * Example usage with display lists * * ========================================================================= */ #include "freetype-gl.h" // ------------------------------------------------------- global variables --- vector_t * fonts; texture_atlas_t *atlas; char *filename = "fonts/Vera.ttf"; wchar_t *text = L"A Quick Brown Fox Jumps Over The Lazy Dog 0123456789"; // --------------------------------------------------------------- gl_print --- void gl_print( texture_font_t * font, wchar_t * text ) { size_t i; texture_glyph_t * glyph = 0; texture_atlas_t * atlas = font->atlas; glEnable( GL_TEXTURE_2D ); glBindTexture( GL_TEXTURE_2D, atlas->id ); glEnable( GL_BLEND ); // For ALPHA texture (atlas depth = 1) if( atlas->depth == 1 ) { glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ); glColor4f( 0, 0, 0, 1 ); // Actual font color } // For RGB texture (atlas depth = 3) else if( atlas->depth == 3 ) { glEnable( GL_COLOR_MATERIAL ); glBlendFunc( GL_CONSTANT_COLOR_EXT, GL_ONE_MINUS_SRC_COLOR ); glColor4f( 1, 1, 1, 1 ); glBlendColor( 0, 0, 0, 1 ); } glPushMatrix(); for( i=0; i 0 ) { glTranslatef(0, texture_font_glyph_get_kerning( font, glyph, text[i-1] ), 0); } glCallList( glyph->id ); glTranslatef( (int)glyph->advance_x, 0, 0 ); } glPopMatrix(); } // ------------------------------------------------------------ gl_print_at --- void gl_print_at( texture_font_t * font, int x, int y, wchar_t * text ) { glPushMatrix(); glTranslatef(x, y-(int)font->height, 0); gl_print( font, text ); glPopMatrix(); } // ---------------------------------------------------------------- display --- void display( void ) { size_t i; GLint viewport[4]; glGetIntegerv( GL_VIEWPORT, viewport ); glClearColor(1,1,1,1); glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); glPushMatrix(); glTranslatef(5, viewport[3], 0); for( i=0; iheight, 0); gl_print( font, text ); } glPopMatrix(); glutSwapBuffers( ); } // ---------------------------------------------------------------- reshape --- void reshape(int width, int height) { glViewport(0, 0, width, height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0, width, 0, height, -1, 1); glMatrixMode(GL_MODELVIEW); glutPostRedisplay(); } // --------------------------------------------------------------- keyboard --- void keyboard( unsigned char key, int x, int y ) { if ( key == 27 ) { exit( 1 ); } } // ----------------------------------------------------- make_display_lists --- void make_display_lists( texture_font_t * self ) { size_t i; texture_glyph_t * glyph; for( i=0; iglyphs) ; ++i) { glyph = *(texture_glyph_t **) vector_get( self->glyphs, i); int x = glyph->offset_x; int y = glyph->offset_y; int w = glyph->width; int h = glyph->height; float s0 = glyph->s0; float t0 = glyph->t0; float s1 = glyph->s1; float t1 = glyph->t1; if( glyph->id ) { glDeleteLists( glyph->id, 1 ); } glyph->id = glGenLists( 1 ); glNewList( glyph->id,GL_COMPILE ); glBegin( GL_TRIANGLES ); glTexCoord2f( s0, t0 ); glVertex2i( x, y ); glTexCoord2f( s0, t1 ); glVertex2i( x, y-h ); glTexCoord2f( s1, t1 ); glVertex2i( x+w, y-h ); glTexCoord2f( s0, t0 ); glVertex2i( x, y ); glTexCoord2f( s1, t1 ); glVertex2i( x+w, y-h ); glTexCoord2f( s1, t0 ); glVertex2i( x+w, y ); glEnd(); glEndList(); } }; // ------------------------------------------------------------------- main --- int main( int argc, char **argv ) { size_t i; glutInit( &argc, argv ); glutInitWindowSize( 800, 400 ); glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH ); glutCreateWindow( "Freetype OpenGL / display lists" ); glutReshapeFunc( reshape ); glutDisplayFunc( display ); glutKeyboardFunc( keyboard ); // Build fonts and corresponding display lists fonts = vector_new( sizeof(texture_font_t) ); atlas = texture_atlas_new( 512, 512, 1 ); for( i=7; i < 27; ++i) { texture_font_t * font = texture_font_new( atlas, filename, i ); texture_font_load_glyphs( font, text ); make_display_lists( font ); vector_push_back( fonts, font ); free( font ); // We're only freeing the local copy of the font } glutMainLoop( ); texture_atlas_delete( atlas ); return 0; }