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demos/teapot: Animate the camera.

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This commit is contained in:
Henri Verbeet
2025-07-12 15:48:59 +02:00
parent 13c9826c30
commit 8f05fbc75d
Notes: Henri Verbeet 2025-07-22 17:20:29 +02:00 
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1632
1 changed files with 88 additions and 4 deletions
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92
demos/teapot.c
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@@ -90,11 +90,13 @@ struct teapot
unsigned int tessellation_level;
unsigned int text_scale;
float theta, phi;
float theta_dir;
bool display_help, flat, wireframe;
bool animate, display_help, flat, wireframe;
struct timeval last_text;
struct timeval frame_times[16];
size_t frame_count;
double t_animate;
D3D12_VIEWPORT vp;
D3D12_RECT scissor_rect;
@@ -546,9 +548,10 @@ static void teapot_update_text(struct teapot *teapot, double fps)
demo_text_draw(text, &amber, 0, -2 * h, "%.2f fps", fps);
if (teapot->display_help)
{
demo_text_draw(text, &amber, 0, 4 * h, "ESC: Exit");
demo_text_draw(text, &amber, 0, 3 * h, " F1: Toggle help");
demo_text_draw(text, &amber, 0, 2 * h, "-/+: Tessellation level (%u)", teapot->tessellation_level);
demo_text_draw(text, &amber, 0, 5 * h, "ESC: Exit");
demo_text_draw(text, &amber, 0, 4 * h, " F1: Toggle help");
demo_text_draw(text, &amber, 0, 3 * h, "-/+: Tessellation level (%u)", teapot->tessellation_level);
demo_text_draw(text, &amber, 0, 2 * h, " A: Toggle animation (%s)", teapot->animate ? "on" : "off");
demo_text_draw(text, &amber, 0, 1 * h, " F: Toggle flat shading (%s)", teapot->flat ? "on" : "off");
demo_text_draw(text, &amber, 0, 0 * h, " W: Toggle wireframe (%s)", teapot->wireframe ? "on" : "off");
}
@@ -560,6 +563,73 @@ static void teapot_update_text(struct teapot *teapot, double fps)
a->StartInstanceLocation = 0;
}
static void teapot_animate(struct teapot *teapot, const struct timeval *tv)
{
double dt = timeval_diff(tv, &teapot->frame_times[(teapot->frame_count - 1) % ARRAY_SIZE(teapot->frame_times)]);
double t = tv->tv_sec + tv->tv_usec / 1000000.0;
static const double max_theta = 150.0 * M_PI / 180.0;
static const double min_theta = 30.0 * M_PI / 180.0;
static const double theta_speed = 10.0; /* °/s */
static const double phi_speed = -20.0; /* °/s */
static bool recover;
if (teapot->theta > max_theta || teapot->theta < -M_PI / 2.0)
{
teapot->theta_dir = 2.0f;
recover = true;
}
else if (teapot->theta < min_theta)
{
teapot->theta_dir = -2.0f;
recover = true;
}
if (recover)
{
double offset = dt * teapot->theta_dir * theta_speed * M_PI / 180.0;
teapot->theta -= offset;
if (fabs(teapot->theta - M_PI / 2.0) < fabs(offset))
{
teapot->t_animate = -1.0;
recover = false;
}
}
else
{
double theta_range = max_theta - min_theta;
double d;
if (teapot->t_animate < 0.0)
{
/* Calculate "t" from current "theta" and "theta_dir". */
d = (teapot->theta - min_theta) / theta_range;
d = acos(d * 2.0 - 1.0);
if (teapot->theta_dir < 0.0f)
d = 2.0 * M_PI - d;
d = (theta_range / M_PI) / ((theta_speed / d) * M_PI / 180.0);
teapot->t_animate = t - d;
}
d = ((t - teapot->t_animate) * theta_speed * M_PI / 180.0) / (theta_range / M_PI);
d = (cos(fmod(d, 2.0 * M_PI)) + 1.0) / 2.0;
d = d * theta_range + min_theta;
teapot->theta_dir = teapot->theta - d;
teapot->theta = d;
}
if (teapot->theta < -M_PI)
teapot->theta += 2.0 * M_PI;
teapot->phi += (phi_speed * M_PI / 180.0) * dt;
if (teapot->phi > M_PI)
teapot->phi -= 2.0 * M_PI;
teapot_update_mvp(teapot);
}
static void teapot_render_frame(struct teapot *teapot)
{
size_t time_idx = teapot->frame_count % ARRAY_SIZE(teapot->frame_times);
@@ -572,6 +642,12 @@ static void teapot_render_frame(struct teapot *teapot)
teapot->last_text = t;
}
if (teapot->animate && teapot->frame_count)
{
teapot_animate(teapot, &t);
teapot_update_mvp(teapot);
}
teapot->frame_times[time_idx] = t;
++teapot->frame_count;
@@ -882,6 +958,10 @@ static void teapot_key_press(struct demo_window *window, demo_key key, void *use
if (teapot->tessellation_level < D3D12_TESSELLATOR_MAX_TESSELLATION_FACTOR)
teapot->cb_data->level = ++teapot->tessellation_level;
break;
case 'a':
if ((teapot->animate = !teapot->animate))
teapot->t_animate = -1.0;
break;
case 'f':
teapot->cb_data->flat = teapot->flat = !teapot->flat;
break;
@@ -907,12 +987,14 @@ static void teapot_key_press(struct demo_window *window, demo_key key, void *use
teapot->theta -= M_PI / 36.0f;
if (teapot->theta < -M_PI)
teapot->theta += 2.0f * M_PI;
teapot->t_animate = -1.0;
teapot_update_mvp(teapot);
break;
case DEMO_KEY_DOWN:
teapot->theta += M_PI / 36.0f;
if (teapot->theta > M_PI)
teapot->theta -= 2.0f * M_PI;
teapot->t_animate = -1.0;
teapot_update_mvp(teapot);
break;
case DEMO_KEY_F1:
@@ -956,10 +1038,12 @@ static int teapot_main(void)
teapot.tessellation_level = 10;
teapot.text_scale = (1.25 * dpi_y / 96.0) + 0.5;
teapot.t_animate = -1.0;
teapot.theta = M_PI / 2.0f;
teapot.phi = -M_PI / 4.0f;
teapot.display_help = true;
teapot.animate = true;
teapot.vp.Width = width;
teapot.vp.Height = height;