/* ============================================================================ * 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. * ============================================================================ */ #include "freetype-gl.h" #include "vertex-buffer.h" // ------------------------------------------------------- typedef & struct --- typedef struct { float x, y, z; // position float s, t; // texture float r, g, b, a; // color } vertex_t; // ------------------------------------------------------- global variables --- texture_atlas_t * atlas; texture_font_t * font; vertex_buffer_t * buffer; wchar_t *text = L"A Quick Brown Fox Jumps Over The Lazy Dog 0123456789 " L"A Quick Brown Fox Jumps Over The Lazy Dog 0123456789 "; int line_count = 42; // --------------------------------------------------------------- add_text --- void add_text( vertex_buffer_t * buffer, texture_font_t * font, wchar_t * text, vec4 * color, vec2 * pen ) { size_t i; float r = color->red, g = color->green, b = color->blue, a = color->alpha; for( i=0; i 0) { kerning = texture_font_glyph_get_kerning( font, glyph, text[i-1] ); } pen->x += kerning; int x0 = (int)( pen->x + glyph->offset_x ); int y0 = (int)( pen->y + glyph->offset_y ); int x1 = (int)( x0 + glyph->width ); int y1 = (int)( y0 - glyph->height ); float s0 = glyph->s0; float t0 = glyph->t0; float s1 = glyph->s1; float t1 = glyph->t1; GLuint index = buffer->vertices->size; GLuint indices[] = {index, index+1, index+2, index, index+2, index+3}; vertex_t vertices[] = { { x0,y0,0, s0,t0, r,g,b,a }, { x0,y1,0, s0,t1, r,g,b,a }, { x1,y1,0, s1,t1, r,g,b,a }, { x1,y0,0, s1,t0, r,g,b,a } }; vertex_buffer_push_back_indices( buffer, indices, 6 ); vertex_buffer_push_back_vertices( buffer, vertices, 4 ); pen->x += glyph->advance_x; } } } // ---------------------------------------------------------------- display --- void display( void ) { static int frame=0, time, timebase=0; static int count = 0; if( count == 0 && frame == 0 ) { printf( "Computing FPS with text generation and rendering at each frame...\n" ); printf( "Number of glyphs: %d\n", (int)wcslen(text)*line_count ); } frame++; time = glutGet( GLUT_ELAPSED_TIME ); if( time-timebase > (2500) ) { printf( "FPS : %.2f (%d frames in %.2f second, %.1f glyph/second)\n", frame*1000.0/(time-timebase), frame, (time-timebase)/1000.0, frame*1000.0/(time-timebase) * wcslen(text)*line_count ); timebase = time; frame = 0; ++count; if( count == 5 ) { printf( "\nComputing FPS with text rendering at each frame...\n" ); printf( "Number of glyphs: %d\n", (int)wcslen(text)*line_count ); } if( count > 9 ) { exit( EXIT_SUCCESS ); } } if( count < 5 ) { size_t i; vec4 color = {{0,0,0,1}}; vec2 pen = {{0,0}}; vertex_buffer_clear( buffer ); pen.y = -font->descender; for( i=0; iheight - font->linegap; } } glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); glColor4f( 0,0,0,1 ); glBindTexture( GL_TEXTURE_2D, atlas->id ); vertex_buffer_render( buffer, GL_TRIANGLES, "vtc" ); 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 ); glLoadIdentity( ); } // --------------------------------------------------------------- keyboard --- void keyboard( unsigned char key, int x, int y ) { if ( key == 27 ) { exit( EXIT_SUCCESS ); } } // ------------------------------------------------------------------- idle --- void idle( void ) { glutPostRedisplay(); } // ------------------------------------------------------------------- main --- int main( int argc, char **argv ) { size_t i; vec4 color = {{0,0,0,1}}; vec2 pen = {{0,0}}; glutInit( &argc, argv ); glutInitWindowSize( 800, 600 ); glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH ); glutCreateWindow( "Freetype OpenGL benchmark" ); glutReshapeFunc( reshape ); glutDisplayFunc( display ); glutKeyboardFunc( keyboard ); glutIdleFunc( idle ); atlas = texture_atlas_new( 512, 512, 1 ); font = texture_font_new( atlas, "fonts/VeraMono.ttf", 12 ); buffer = vertex_buffer_new( "v3f:t2f:c4f" ); pen.y = -font->descender; for( i=0; iheight - font->linegap; } glClearColor( 1.0, 1.0, 1.0, 1.0 ); glDisable( GL_DEPTH_TEST ); glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ); glEnable( GL_TEXTURE_2D ); glEnable( GL_BLEND ); glutMainLoop( ); return EXIT_SUCCESS; }