static void load_camera()
{
FILE* fp = fopen("camera.txt", "rt");
assert(fp);
for (int i = 0; i < 16; i++)
fscanf(fp, "%f", &cam_to_view.data()[i]);
for (int i = 0; i < 16; i++)
fscanf(fp, "%f", &cam_to_clip.data()[i]);
fclose(fp);
fprintf(stderr, "camera loaded from camera.txt\n");
}
int main()
{
init();
if (SDL_Init(SDL_INIT_VIDEO) < 0)
{
fprintf(stderr, "SDL_Init failed: %s\n", SDL_GetError());
return 1;
}
atexit(SDL_Quit);
if (SDL_SetVideoMode(WINDOW_WIDTH, WINDOW_HEIGHT, 32, SDL_OPENGL) == 0)
{
fprintf(stderr, "SDL_SetVideoMode failed: %s\n", SDL_GetError());
return 1;
}
cam_to_clip = perspective<float>(45.f / 180.f * 3.14159265f, 1.f, 0.1f, 100.f);
Vector3f eye = Vector3f(4.f, 1.f, 4.f);
Vector3f center = Vector3f(0.f, 0.f, 0.f);
Vector3f up = Vector3f(0.f, 1.f, 0.f);
cam_to_view = look_at<float>(eye, center, up);
load_camera();
int prev_ticks = SDL_GetTicks();
int last_ticks = prev_ticks;
int frames = 0;
while (1)
{
int dt = SDL_GetTicks() - prev_ticks;
prev_ticks += dt;
// Handle events.
SDL_Event ev;
while (SDL_PollEvent(&ev))
{
switch (ev.type)
{
case SDL_KEYDOWN:
switch (ev.key.keysym.sym)
{
case SDLK_ESCAPE:
return 0;
case SDLK_1:
fprintf(stderr, "rendering using OpenGL\n");
mode = RENDER_GL;
last_ticks = SDL_GetTicks();
frames = 0;
break;
case SDLK_2:
fprintf(stderr, "rendering using cpu ray tracing\n");
mode = RENDER_RT_CPU;
last_ticks = SDL_GetTicks();
frames = 0;
break;
case SDLK_3:
fprintf(stderr, "rendering using cuda ray tracing\n");
mode = RENDER_RT_CUDA;
last_ticks = SDL_GetTicks();
frames = 0;
break;
case SDLK_u:
{
FILE* fp = fopen("camera.txt", "wt");
for (int i = 0; i < 16; i++)
fprintf(fp, "%f ", cam_to_view.data()[i]);
for (int i = 0; i < 16; i++)
fprintf(fp, "%f ", cam_to_clip.data()[i]);
fclose(fp);
fprintf(stderr, "saved camera to camera.txt\n");
}
break;
case SDLK_p:
load_camera();
break;
default:
break;
}
break;
case SDL_MOUSEMOTION:
if (ev.motion.state & 1)
{
float fdx = ev.motion.xrel / 400.;
float fdy = ev.motion.yrel / 400.;
cam_to_view =
rotate(Vector3f(1.0f, 0.0, 0.0), fdy) *
rotate(Vector3f(0.0, 1.0f, 0.0), fdx) *
cam_to_view;
}
break;
case SDL_QUIT:
return 0;
}
}
// Handle movement.
float dtf = dt / 1000.f;
Uint8* keys = SDL_GetKeyState(0);
if (keys[SDLK_UP] || keys[SDLK_w])
move(Vector3f(0.f, 0.f, move_speed) * dtf);
if (keys[SDLK_DOWN] || keys[SDLK_s])
move(Vector3f(0.f, 0.f, -move_speed) * dtf);
if (keys[SDLK_LEFT] || keys[SDLK_a])
move(Vector3f(move_speed, 0.f, 0.f) * dtf);
if (keys[SDLK_RIGHT] || keys[SDLK_d])
move(Vector3f(-move_speed, 0.f, 0.f) * dtf);
// Draw things.
switch (mode)
{
case RENDER_GL:
draw_gl();
break;
case RENDER_RT_CPU:
draw_rt_cpu();
break;
case RENDER_RT_CUDA:
draw_rt_cuda();
break;
};
SDL_GL_SwapBuffers();
// frames++;
// fprintf(stderr, "average %.2f\n", (SDL_GetTicks() - last_ticks) / (double)frames);
}
return 0;
}
void load(const char* fn)
{
FILE* fp = fopen(fn, "r");
for (;;)
{
Matrix4x4f m;
int n = fscanf(fp, "%f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f",
&m.data()[0], &m.data()[1], &m.data()[2], &m.data()[3],
&m.data()[4], &m.data()[5], &m.data()[6], &m.data()[7],
&m.data()[8], &m.data()[9], &m.data()[10], &m.data()[11],
&m.data()[12], &m.data()[13], &m.data()[14], &m.data()[15]);
if (n != 16)
break;
frames.push_back(m);
}
fclose(fp);
}