+++ /dev/null
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-#include <assert.h>
-#include <GL/glut.h>
-#include "logo.h"
-
-#ifndef GL_MULTISAMPLE
-#define GL_MULTISAMPLE 0x809d
-#endif
-
-#define MSAA
-
-int init(void);
-void display(void);
-void idle(void);
-void reshape(int x, int y);
-void keyb(unsigned char key, int x, int y);
-int parse_args(int argc, char **argv);
-void print_usage(const char *argv0);
-
-int win_width, win_height;
-int nverts = 256;
-long start_time;
-int msaa = 1;
-int fullscr = 0;
-
-
-int main(int argc, char **argv)
-{
- unsigned int flags = GLUT_RGB | GLUT_DOUBLE;
-
- glutInit(&argc, argv);
- if(parse_args(argc, argv) == -1) {
- return 1;
- }
-
-#ifdef MSAA
- if(msaa) {
- flags |= GLUT_MULTISAMPLE;
- }
-#endif
-
- glutInitWindowSize(1280, 800);
- glutInitDisplayMode(flags);
- glutCreateWindow("census");
-
- if(fullscr) {
- glutFullScreen();
- glutSetCursor(GLUT_CURSOR_NONE);
- }
-
- glutDisplayFunc(display);
- glutIdleFunc(idle);
- glutReshapeFunc(reshape);
- glutKeyboardFunc(keyb);
-
- if(init() == -1) {
- return 1;
- }
-
- glutMainLoop();
- return 0;
-}
-
-int init(void)
-{
- if(init_logo("data/census.curves") == -1) {
- return -1;
- }
-
-#ifdef MSAA
- if(msaa) {
- glEnable(GL_MULTISAMPLE);
- }
-#endif
-
- start_time = glutGet(GLUT_ELAPSED_TIME);
- return 0;
-}
-
-static void draw_disc(float x, float y, float rad, int sub)
-{
- int i;
- glBegin(GL_TRIANGLE_FAN);
- glVertex2f(x, y);
- for(i=0; i<sub; i++) {
- float t = (float)i / (float)(sub - 1);
- float theta = t * M_PI * 2.0;
- glVertex2f(cos(theta) * rad + x, sin(theta) * rad + y);
- }
- glEnd();
-}
-
-static void draw_line(float x0, float y0, float x1, float y1, float rad)
-{
- float dx, dy, rx, ry, len;
-
- dx = x1 - x0;
- dy = y1 - y0;
- len = sqrt(dx * dx + dy * dy);
-
- rx = rad * dy / len;
- ry = -rad * dx / len;
-
- draw_disc(x0, y0, rad, 12);
- draw_disc(x1, y1, rad, 12);
-
- glBegin(GL_QUADS);
- glVertex2f(x0 + rx, y0 + ry);
- glVertex2f(x1 + rx, y1 + ry);
- glVertex2f(x1 - rx, y1 - ry);
- glVertex2f(x0 - rx, y0 - ry);
- glEnd();
-}
-
-#define LOOPTIME 1.45f
-
-void display(void)
-{
- int i;
- long msec = glutGet(GLUT_ELAPSED_TIME) - start_time;
- float t = (float)msec / 1000.0f;
- float a[2], b[2], dt;
- float anim, alpha;
-
- glClear(GL_COLOR_BUFFER_BIT);
-
- glLineWidth(5.0);
-
- anim = fmod(t / 6.0f, LOOPTIME);
- alpha = 1.0f - ((anim - (LOOPTIME - 0.075)) / 0.06f);
- if(alpha < 0.0f) alpha = 0.0f;
- if(alpha > 1.0f) alpha = 1.0f;
-
- dt = (anim > 1.0f ? 1.0f : anim) / (float)(nverts - 1);
-
- glColor4f(1, 1, 1, alpha);
- for(i=0; i<nverts-1; i++) {
- float t0 = (float)i * dt;
- float t1 = (float)(i + 1) * dt;
- eval_logo(a, t0);
- eval_logo(b, t1);
- draw_line(a[0], a[1], b[0], b[1], 0.02);
- }
-
- if(anim > 0.0f) {
- eval_logo(a, 0);
- draw_disc(a[0], a[1], 0.05, 22);
- }
- if(anim >= 1.0f) {
- eval_logo(b, 1);
- draw_disc(b[0], b[1], 0.05, 22);
- }
-
- glEnable(GL_BLEND);
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-
- glColor4f(0.8, 0, 0, 2.0 * (anim - 1.0f) / (LOOPTIME - 1.0f));
- draw_disc(0, 0, 0.14, 30);
-
- if(alpha < 1.0f) {
- glBegin(GL_QUADS);
- glColor4f(0, 0, 0, 1.0f - alpha);
- glVertex2f(-1, -1);
- glVertex2f(1, -1);
- glVertex2f(1, 1);
- glVertex2f(-1, 1);
- glEnd();
- }
-
- glDisable(GL_BLEND);
-
- glutSwapBuffers();
- assert(glGetError() == GL_NO_ERROR);
-}
-
-void idle(void)
-{
- glutPostRedisplay();
-}
-
-void reshape(int x, int y)
-{
- float aspect = (float)x / (float)y;
- win_width = x;
- win_height = y;
-
- glViewport(0, 0, x, y);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glScalef(1.0f / aspect, 1.0f, 1.0f);
-}
-
-void keyb(unsigned char key, int x, int y)
-{
- static int saved_width = 800, saved_height = 600;
-
- switch(key) {
- case 27:
- exit(0);
-
- case '-':
- nverts -= 8;
- printf("nverts: %d\n", nverts);
- glutPostRedisplay();
- break;
-
- case '=':
- nverts += 8;
- printf("nverts: %d\n", nverts);
- glutPostRedisplay();
- break;
-
- case 'f':
- fullscr = !fullscr;
- if(fullscr) {
- saved_width = win_width;
- saved_height = win_height;
- glutFullScreen();
- glutSetCursor(GLUT_CURSOR_NONE);
- } else {
- glutReshapeWindow(saved_width, saved_height);
- glutSetCursor(GLUT_CURSOR_INHERIT);
- }
- break;
- }
-}
-
-int parse_args(int argc, char **argv)
-{
- int i;
-
- for(i=1; i<argc; i++) {
- if(argv[i][0] == '-') {
- if(strcmp(argv[i], "-fs") == 0) {
- fullscr = 1;
- } else if(strcmp(argv[i], "-noaa") == 0) {
- msaa = 0;
- } else if(strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "-help") == 0) {
- print_usage(argv[0]);
- exit(0);
- } else {
- fprintf(stderr, "invalid option: %s\n", argv[i]);
- return -1;
- }
- } else {
- fprintf(stderr, "unexpected argument: %s\n", argv[i]);
- return -1;
- }
- }
- return 0;
-}
-
-void print_usage(const char *argv0)
-{
- printf("Usage: %s [options]\n", argv0);
- printf("Options:\n");
- printf(" -fs: fullscreen\n");
- printf(" -noaa: disable anti-aliasing\n");
- printf(" -h,-help: print usage and exit\n");
-}
projects / censuslogo / blobdiff