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/*
* mesacube - THE spinning cube
*
* Build:
* cc -O2 -I$HOME/mesa/include -I$HOME -o cube cube.c \
* $HOME/mesa/lib/libGL.a -lm
*
* Run: VERITE_UCODE=$HOME/v2000gl.uc \
* ./cube [seconds] (0 = spin until ^C)
*/
#include <sys/time.h>
#include <math.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <GL/gl.h>
#include <GL/vrmesa.h>
static volatile sig_atomic_t stop;
static void
onint(int sig)
{
(void)sig;
stop = 1;
}
static const GLfloat faces[6][4][3] = {
{ {-1,-1,-1},{-1, 1,-1},{ 1, 1,-1},{ 1,-1,-1} }, /* -Z */
{ {-1,-1, 1},{ 1,-1, 1},{ 1, 1, 1},{-1, 1, 1} }, /* +Z */
{ {-1,-1,-1},{-1,-1, 1},{-1, 1, 1},{-1, 1,-1} }, /* -X */
{ { 1,-1,-1},{ 1, 1,-1},{ 1, 1, 1},{ 1,-1, 1} }, /* +X */
{ {-1,-1,-1},{ 1,-1,-1},{ 1,-1, 1},{-1,-1, 1} }, /* -Y */
{ {-1, 1,-1},{-1, 1, 1},{ 1, 1, 1},{ 1, 1,-1} }, /* +Y */
};
int
main(int argc, char **argv)
{
vrMesaContext ctx;
struct timeval t0, t1, tstart;
float a = 20.0f, b = 30.0f;
double secs = 30.0;
int frame = 0, f, i;
if (argc > 1)
secs = atof(argv[1]);
signal(SIGINT, onint);
ctx = vrMesaCreateContext(NULL);
if (ctx == NULL)
return 1;
vrMesaMakeCurrent(ctx);
printf("GL_RENDERER: %s (%s)\n", glGetString(GL_RENDERER),
glGetString(GL_VERSION));
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glClearColor(0.06f, 0.07f, 0.12f, 1);
glViewport(0, 0, 640, 480);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-1.0, 1.0, -0.75, 0.75, 1.0, 50.0);
gettimeofday(&tstart, NULL);
t0 = tstart;
while (!stop) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0, 0, -4.5f);
glRotatef(a, 1, 0, 0);
glRotatef(b, 0, 1, 0);
glBegin(GL_QUADS);
for (f = 0; f < 6; f++)
for (i = 0; i < 4; i++) {
const GLfloat *v = faces[f][i];
/* corner color = position in RGB space */
glColor3f((v[0] + 1) * 0.5f,
(v[1] + 1) * 0.5f, (v[2] + 1) * 0.5f);
glVertex3fv(v);
}
glEnd();
vrMesaSwapBuffers();
a += 1.1f;
b += 1.7f;
if (++frame % 100 == 0) {
double dt;
gettimeofday(&t1, NULL);
dt = (t1.tv_sec - t0.tv_sec) +
(t1.tv_usec - t0.tv_usec) / 1e6;
printf("%d frames, %.1f fps\n", frame, 100.0 / dt);
t0 = t1;
}
if (secs > 0) {
gettimeofday(&t1, NULL);
if ((t1.tv_sec - tstart.tv_sec) +
(t1.tv_usec - tstart.tv_usec) / 1e6 >= secs)
break;
}
}
printf("mesacube done after %d frames\n", frame);
vrMesaDestroyContext(ctx);
return 0;
}
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