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kc3-lang/ftgl/demo/simple.cpp
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sammy
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/* * simple.cpp - simple demo for FTGL, the OpenGL font library * * Copyright (c) 2008 Sam Hocevar <sam@hocevar.net> * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include "config.h" #include <math.h> // sin(), cos() #include <stdlib.h> // exit() #if defined HAVE_GL_GLUT_H # include <GL/glut.h> #elif defined HAVE_GLUT_GLUT_H # include <GLUT/glut.h> #else # error GLUT headers not present #endif #include <FTGL/ftgl.h> static FTFont *font[3]; static int fontindex = 0; static int lastfps = 0; static int frames = 0; // // FTHaloGlyph is a derivation of FTPolygonGlyph that also displays a // halo of FTOutlineGlyph objects at varying positions and with varying // outset values. // class FTHaloGlyph : public FTPolygonGlyph { public: FTHaloGlyph(FT_GlyphSlot glyph) : FTPolygonGlyph(glyph, 0, true) { for(int i = 0; i < 5; i++) { subglyph[i] = new FTOutlineGlyph(glyph, i, true); } } private: const FTPoint& Render(const FTPoint& pen, int renderMode) { glPushMatrix(); for(int i = 0; i < 5; i++) { glTranslatef(0.0, 0.0, -2.0); subglyph[i]->Render(pen, renderMode); } glPopMatrix(); return FTPolygonGlyph::Render(pen, renderMode); } FTGlyph *subglyph[5]; }; // // FTHaloFont is a simple FTFont derivation that builds FTHaloGlyph // objects. // class FTHaloFont : public FTFont { public: FTHaloFont(char const *fontFilePath) : FTFont(fontFilePath) {} private: virtual FTGlyph* MakeGlyph(FT_GlyphSlot slot) { return new FTHaloGlyph(slot); } }; // // Main OpenGL loop: set up lights, apply a few rotation effects, and // render text using the current FTGL object. // static void RenderScene(void) { int now = glutGet(GLUT_ELAPSED_TIME); float n = (float)now / 20.; float t1 = sin(n / 80); float t2 = sin(n / 50 + 1); float t3 = sin(n / 30 + 2); float ambient[4] = { (t1 + 2.0) / 3, (t2 + 2.0) / 3, (t3 + 2.0) / 3, 0.3 }; float diffuse[4] = { 1.0, 0.9, 0.9, 1.0 }; float specular[4] = { 1.0, 0.7, 0.7, 1.0 }; float position[4] = { 100.0, 100.0, 0.0, 1.0 }; float front_ambient[4] = { 0.7, 0.7, 0.7, 0.0 }; glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glEnable(GL_LIGHTING); glEnable(GL_DEPTH_TEST); glEnable(GL_LINE_SMOOTH); glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA, GL_ONE); glPushMatrix(); glTranslatef(-0.9, -0.2, -10.0); glLightfv(GL_LIGHT1, GL_AMBIENT, ambient); glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse); glLightfv(GL_LIGHT1, GL_SPECULAR, specular); glLightfv(GL_LIGHT1, GL_POSITION, position); glEnable(GL_LIGHT1); glPopMatrix(); glPushMatrix(); glMaterialfv(GL_FRONT, GL_AMBIENT, front_ambient); glColorMaterial(GL_FRONT, GL_DIFFUSE); glTranslatef(0.0, 0.0, 20.0); glRotatef(n / 1.11, 0.0, 1.0, 0.0); glRotatef(n / 2.23, 1.0, 0.0, 0.0); glRotatef(n / 3.17, 0.0, 0.0, 1.0); glTranslatef(-260.0, -0.2, 0.0); glColor3f(1.0, 1.0, 1.0); font[fontindex]->Render("Hello FTGL!"); glPopMatrix(); glutSwapBuffers(); frames++; if(now - lastfps > 5000) { fprintf(stderr, "%i frames in 5.0 seconds = %g FPS\n", frames, frames * 1000. / (now - lastfps)); lastfps += 5000; frames = 0; } } // // GLUT key processing function: <esc> quits, <tab> cycles across fonts. // static void ProcessKeys(unsigned char key, int x, int y) { switch(key) { case 27: delete font[0]; delete font[1]; delete font[2]; exit(EXIT_SUCCESS); break; case '\t': fontindex = (fontindex + 1) % 3; break; } } // // Main program entry point: set up GLUT window, load fonts, run GLUT loop. // int main(int argc, char **argv) { char const *file = NULL; #ifdef FONT_FILE file = FONT_FILE; #else if(argc < 2) { fprintf(stderr, "Usage: %s <font_name.ttf>\n", argv[0]); return EXIT_FAILURE; } #endif if(argc > 1) { file = argv[1]; } // Initialise GLUT stuff glutInit(&argc, argv); glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA); glutInitWindowPosition(100, 100); glutInitWindowSize(640, 480); glutCreateWindow("simple FTGL C++ demo"); glutDisplayFunc(RenderScene); glutIdleFunc(RenderScene); glutKeyboardFunc(ProcessKeys); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(90, 640.0f / 480.0f, 1, 1000); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(0.0, 0.0, 640.0f / 2.0f, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); // Initialise FTGL stuff font[0] = new FTExtrudeFont(file); font[1] = new FTBufferFont(file); font[2] = new FTHaloFont(file); if(font[0]->Error() || font[1]->Error() || font[2]->Error()) { fprintf(stderr, "%s: could not load font `%s'\n", argv[0], file); return EXIT_FAILURE; } font[0]->FaceSize(80); font[0]->Depth(10); font[0]->Outset(0, 3); font[0]->CharMap(ft_encoding_unicode); font[1]->FaceSize(80); font[1]->CharMap(ft_encoding_unicode); font[2]->FaceSize(80); font[2]->CharMap(ft_encoding_unicode); fprintf(stderr, "Using FTGL version %s\n", FTGL::GetString(FTGL::CONFIG_VERSION)); // Run GLUT loop glutMainLoop(); return EXIT_SUCCESS; }