void t_screen::gl_init(int w, int h)
{
glViewport(0,0, w,h);
glEnable(GL_TEXTURE_2D);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
width= w; height= h;
rebuildtextures();
if(ortho) setortho();
else setperspective();
flux_screenresize(w, h);
}
void initcamera()
{
// initialize view (u,v,n) in world coordinates
vrp.x = vrp.y = vrp.z = 0.0f;
dir.x = 0.0f;
dir.y = 0.0f;
dir.z = -1.0f;
up.x = 0.0f;
up.y = 1.0f;
up.z = 0.0f;
// initialize viewvolume in image plane (assumes that imageplane reference point is 0,0,0)
// adjust so we have same aspect ratio as window
float fwidth = FRUSTUMWIDTH;
float fheight = FRUSTUMHEIGHT;
float aspect;
if (viewport.w > viewport.h) {
aspect = (float) viewport.w/viewport.h;
fwidth = fwidth * aspect;
}
else {
aspect = (float) viewport.h/viewport.w;
fheight = fheight * aspect;
}
frustum.bottom = -fheight/2.0f;
frustum.top = -frustum.bottom;
frustum.left = -fwidth/2.0f;
frustum.right = -frustum.left;
// initialize eyepos origin
#ifdef ORTHO
e.u = 0.0f;
e.v = 0.0f;
e.n = -10000.0f; //ORTHO
frustum.near = -2.0f;
frustum.far = 2.0f;
#else
e.u = 0.0f;
e.v = 0.0f;
e.n = -5.0f; // PERSPECTIVE
frustum.near = 0.1f;
frustum.far = 100.0f;
#endif
// initialize viewvolume in image plane (assumes that imageplane reference point is 0,0,0)
viewvolume.bottom = frustum.bottom;
viewvolume.left = frustum.left;
viewvolume.top = frustum.top;
viewvolume.right = frustum.right;
viewvolume.far = frustum.far;
viewvolume.near = frustum.near;
// set projection matrix
#ifdef ORTHO
setortho(scale, viewvolume);
#else
float fovy = 2.0f * atan(frustum.top/-e.n);
fovy = fovy * DEGREES;
setperspective(fovy, 1.0f, 0.1f, 100.0f);
#endif
// initialize view (u,v,n) in world coordinates
camera.r.x = vrp.x;
camera.r.y = vrp.y;
camera.r.z = vrp.z;
camera.n.x = dir.x;
camera.n.y = dir.y;
camera.n.z = dir.z;
camera.v.x = up.x;
camera.v.y = up.y;
camera.v.z = up.z;
camera.v = normalize3f(camera.v);
camera.u = cross3f(camera.n, camera.v);
camera.e.u = e.u;
camera.e.v = e.v;
camera.e.n = e.n;
// set view to world transform matrix
setvwm(vwm, camera);
// set world to view transform matrix
setwvm(wvm, camera);
// initialize eyepos origin
eyepos.u = e.u;
eyepos.v = e.v;
eyepos.n = e.n;
return;
}
