/* ========================================================================= * 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 "font-manager.h" #include "vertex-buffer.h" #include "text-buffer.h" #include "markup.h" #include "shader.h" // ------------------------------------------------------- typedef & struct --- typedef struct { float x, y, z; // position float s, t; // texture float r, g, b, a; // color } vertex_t; typedef struct { float x, y; vec4 color; } point_t; // ------------------------------------------------------- global variables --- vertex_buffer_t * text_buffer; vertex_buffer_t * line_buffer; vertex_buffer_t * point_buffer; // ---------------------------------------------------------------- display --- void display( void ) { int viewport[4]; glGetIntegerv( GL_VIEWPORT, viewport ); glClearColor(1,1,1,1); glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); glEnable( GL_BLEND ); glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ); glEnable( GL_POINT_SMOOTH ); glColor4f(1,1,1,1); glEnable( GL_TEXTURE_2D ); vertex_buffer_render( text_buffer, GL_TRIANGLES, "vtc" ); glDisable( GL_TEXTURE_2D ); vertex_buffer_render( line_buffer, GL_LINES, "vc" ); glPointSize( 10.0f ); vertex_buffer_render( point_buffer, GL_POINTS, "vc" ); 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( EXIT_SUCCESS ); } } // --------------------------------------------------------------- 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 indices[] = {0,1,2,0,2,3}; 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( buffer, vertices, 4, indices, 6 ); pen->x += glyph->advance_x; } } } // ------------------------------------------------------------------- main --- int main( int argc, char **argv ) { int width = 600; int height = 600; glutInit( &argc, argv ); glutInitWindowSize( width, height ); glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH ); glutCreateWindow( "Freetype OpenGL" ); glutReshapeFunc( reshape ); glutDisplayFunc( display ); glutKeyboardFunc( keyboard ); vec4 blue = {{0,0,1,1}}; vec4 black = {{0,0,0,1}}; texture_atlas_t * atlas = texture_atlas_new( 512, 512, 1); texture_font_t * big = texture_font_new( atlas, "fonts/Vera.ttf", 400); texture_font_t * small = texture_font_new( atlas, "fonts/Vera.ttf", 18); texture_font_t * title = texture_font_new( atlas, "fonts/Vera.ttf", 32); text_buffer = vertex_buffer_new( "v3f:t2f:c4f" ); line_buffer = vertex_buffer_new( "v2f:c4f" ); point_buffer = vertex_buffer_new( "v2f:c4f" ); vec2 pen, origin; texture_glyph_t *glyph = texture_font_get_glyph( big, L'g' ); origin.x = width/2 - glyph->offset_x - glyph->width/2; origin.y = height/2 - glyph->offset_y + glyph->height/2; add_text( text_buffer, big, L"g", &black, &origin ); // title pen.x = 50; pen.y = 560; add_text( text_buffer, title, L"Glyph metrics", &black, &pen ); point_t vertices[] = { // Baseline {0.1*width, origin.y, black}, {0.9*width, origin.y, black}, // Top line {0.1*width, origin.y + glyph->offset_y, black}, {0.9*width, origin.y + glyph->offset_y, black}, // Bottom line {0.1*width, origin.y + glyph->offset_y - glyph->height, black}, {0.9*width, origin.y + glyph->offset_y - glyph->height, black}, // Left line at origin {width/2-glyph->offset_x-glyph->width/2, 0.1*height, black}, {width/2-glyph->offset_x-glyph->width/2, 0.9*height, black}, // Left line {width/2 - glyph->width/2, .3*height, black}, {width/2 - glyph->width/2, .9*height, black}, // Right line {width/2 + glyph->width/2, .3*height, black}, {width/2 + glyph->width/2, .9*height, black}, // Right line at origin {width/2-glyph->offset_x-glyph->width/2+glyph->advance_x, 0.1*height, black}, {width/2-glyph->offset_x-glyph->width/2+glyph->advance_x, 0.7*height, black}, // Width {width/2 - glyph->width/2, 0.8*height, blue}, {width/2 + glyph->width/2, 0.8*height, blue}, // Advance_x {width/2-glyph->width/2-glyph->offset_x, 0.2*height, blue}, {width/2-glyph->width/2-glyph->offset_x+glyph->advance_x, 0.2*height, blue}, // Offset_x {width/2-glyph->width/2-glyph->offset_x, 0.85*height, blue}, {width/2-glyph->width/2, 0.85*height, blue}, // Height {0.3*width/2, origin.y + glyph->offset_y - glyph->height,blue}, {0.3*width/2, origin.y + glyph->offset_y, blue}, // Offset y {0.8*width, origin.y + glyph->offset_y, blue}, {0.8*width, origin.y , blue}, }; GLuint indices [] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12, 13,14,15,16,17,18,19,20,21,22,23,24,25}; vertex_buffer_push_back( line_buffer, vertices, 26, indices, 26 ); pen.x = width/2 - 48; pen.y = .2*height - 18; add_text( text_buffer, small, L"advance_x", &blue, &pen ); pen.x = width/2 - 20; pen.y = .8*height + 3; add_text( text_buffer, small, L"width", &blue, &pen ); pen.x = width/2 - glyph->width/2 + 5; pen.y = .85*height-8; add_text( text_buffer, small, L"offset_x", &blue, &pen ); pen.x = 0.2*width/2-30; pen.y = origin.y + glyph->offset_y - glyph->height/2; add_text( text_buffer, small, L"height", &blue, &pen ); pen.x = 0.8*width+3; pen.y = origin.y + glyph->offset_y/2 -6; add_text( text_buffer, small, L"offset_y", &blue, &pen ); pen.x = width/2 - glyph->offset_x - glyph->width/2 - 58; pen.y = height/2 - glyph->offset_y + glyph->height/2 - 20; add_text( text_buffer, small, L"Origin", &black, &pen ); GLuint i = 0; point_t p; p.color = black; // Origin point p.x = width/2 - glyph->offset_x - glyph->width/2; p.y = height/2 - glyph->offset_y + glyph->height/2; vertex_buffer_push_back( point_buffer, &p, 1, &i, 1 ); // Advance point p.x = width/2 - glyph->offset_x - glyph->width/2 + glyph->advance_x; p.y = height/2 - glyph->offset_y + glyph->height/2; vertex_buffer_push_back( point_buffer, &p, 1, &i, 1 ); glutMainLoop( ); return 0; }