#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
+#include <math.h>
#include <assert.h>
#include <GL/glut.h>
#include "logo.h"
-#define BEZ_SEG 16
+#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;
-void draw_bezier(float *cp, int sub);
int main(int argc, char **argv)
{
+ unsigned int flags = GLUT_RGB | GLUT_DOUBLE;
+
glutInit(&argc, argv);
- glutInitWindowSize(800, 600);
- glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
+ 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();
+ }
+
glutDisplayFunc(display);
+ glutIdleFunc(idle);
glutReshapeFunc(reshape);
glutKeyboardFunc(keyb);
int init(void)
{
- glEnable(GL_LINE_SMOOTH);
+ 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, 8);
+ draw_disc(x1, y1, rad, 8);
+
+ 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 1.3f
+
void display(void)
{
- int i, nseg;
+ 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 - 0.2)) / 0.2f);
+ 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, 18);
+ }
+ if(anim >= 1.0f) {
+ eval_logo(b, 1);
+ draw_disc(b[0], b[1], 0.05, 18);
+ }
+
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- glLineWidth(2.0);
- glColor3f(1, 1, 1);
- nseg = LOGOCP_SIZE / 4;
- for(i=0; i<nseg; i++) {
- draw_bezier((float*)(logocp + i * 4), BEZ_SEG);
+ glColor4f(0.8, 0, 0, 2.0 * (anim - 1.0f) / (LOOPTIME - 1.0f));
+ draw_disc(0, 0, 0.14, 24);
+
+ 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);
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);
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();
+ } else {
+ glutReshapeWindow(saved_width, saved_height);
+ }
+ break;
}
}
-#define LERP(a, b, t) ((a) + ((b) - (a)) * (t))
-
-void draw_bezier(float *cp, int sub)
+int parse_args(int argc, char **argv)
{
int i;
- float cx[4], cy[4], mx[3], my[3], mmx[2], mmy[2], x, y;
- if(sub < 1) sub = 1;
-
- for(i=0; i<4; i++) {
- cx[i] = cp[i * 2] / LOGO_W - 0.5f;
- cy[i] = 0.5f - cp[i * 2 + 1] / LOGO_H;
+ 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;
+}
- glBegin(GL_LINE_STRIP);
- for(i=0; i<BEZ_SEG; i++) {
- float t = (float)i / (float)(BEZ_SEG - 1);
-
- mx[0] = LERP(cx[0], cx[1], t);
- my[0] = LERP(cy[0], cy[1], t);
-
- mx[1] = LERP(cx[1], cx[2], t);
- my[1] = LERP(cy[1], cy[2], t);
-
- mx[2] = LERP(cx[2], cx[3], t);
- my[2] = LERP(cy[2], cy[3], t);
-
- mmx[0] = LERP(mx[0], mx[1], t);
- mmy[0] = LERP(my[0], my[1], t);
-
- mmx[1] = LERP(mx[1], mx[2], t);
- mmy[1] = LERP(my[1], my[2], t);
-
- x = LERP(mmx[0], mmx[1], t);
- y = LERP(mmy[0], mmy[1], t);
-
- glVertex2f(x, y);
- }
- glEnd();
+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