legacy/rts_glVolumeViewer.cpp

#include "rts_glVolumeViewer.h"
#include "PerformanceData.h"

PerformanceData PD;


rts_glVolumeViewer::rts_glVolumeViewer()
{
	m_optimize=false;
	m_min_threshold = 0;
	m_max_threshold = 255;
	m_volume_texture = 0;
	m_p = point3D(0.0, 0.0, 0.0);
	m_texture_size = vector3D(2,2,1);
	m_voxel_size = vector3D(1.0, 1.0, 1.0);
	m_dimensions = vector3D(m_texture_size.x * m_voxel_size.x,
							m_texture_size.y * m_voxel_size.y,
							m_texture_size.z * m_voxel_size.z);
	m_dimensions.normalize();
	

	//calculate the radii
	m_inner_radius = 0.5;
	m_outer_radius = (vector3D(1.0, 1.0, 1.0).length())*0.5;

	//create the plane display list
	SetNumPlanes(256);

	//visualization parameters
	m_alpha_scale = 1.0;
}


rts_glVolumeViewer::rts_glVolumeViewer(rtsVolume volume_data, 
					   point3D position = point3D(0.0, 0.0, 0.0), 
					   vector3D voxel_size = vector3D(1.0, 1.0, 1.0))
{
	m_optimize=false;
	m_volume_texture = 0;
	m_p = position;
	m_min_threshold = 0;
	m_max_threshold = 255;
	m_texture_size = vector3D(volume_data.get_dimx(), volume_data.get_dimy(), volume_data.get_dimz());
	m_voxel_size = vector3D(1.0, 1.0, 1.0);
	m_dimensions = vector3D(m_texture_size.x * m_voxel_size.x,
						    m_texture_size.y * m_voxel_size.y,
							m_texture_size.z * m_voxel_size.z);
	m_dimensions.normalize();


	//store the volume
	PD.StartTimer(COPY_DATA);
	m_source = volume_data;
	PD.EndTimer(COPY_DATA);

	//calculate the radii
	//m_inner_radius = max(max(m_dimensions.x, m_dimensions.y), m_dimensions.z) * 0.5;
	//m_outer_radius = (m_dimensions.length())*0.5;
	m_inner_radius = 0.5;
	m_outer_radius = vector3D(1.0, 1.0, 1.0).length()*0.5;

	
	SetNumPlanes(256);
	CHECK_OPENGL_ERROR
	//enable 3d texture mapping
	glEnable(GL_TEXTURE_3D);
	CHECK_OPENGL_ERROR

 
	//3D Texture mapping
	glGenTextures(1, &m_volume_texture);
	CHECK_OPENGL_ERROR
	glBindTexture(GL_TEXTURE_3D, m_volume_texture);
	CHECK_OPENGL_ERROR

	glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP);
	CHECK_OPENGL_ERROR

	//load the texture data
	m_load_texture();
	CHECK_OPENGL_ERROR

	// our texture colors will replace the untextured colors
	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_BLEND);
    glShadeModel(GL_FLAT);
	CHECK_OPENGL_ERROR

	glDisable(GL_TEXTURE_3D);

	//visualization parameters
	m_alpha_scale = 1.0;
}

//~rts_glVolumeViewer()
//{


//}


void rts_glVolumeViewer::RenderBoundingBox()
{

	
	//create the transformation for the volume
	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();
	glScalef(m_dimensions.x, m_dimensions.y, m_dimensions.z);
	glTranslatef(m_p.x, m_p.y, m_p.z);
	glutWireCube(1.0);
	glPopMatrix();
}

void rts_glVolumeViewer::m_draw_plane(point3D p, vector3D n, vector3D up)
{

	//calculate the u, v vectors representing the plane
	vector3D v = up.cross(n); v.normalize();
	vector3D u = n.cross(v);  u.normalize();

	//compute the points that make up the plane
	point3D p0 = p - v*m_outer_radius - u*m_outer_radius;
	point3D p1 = p - v*m_outer_radius + u*m_outer_radius;
	point3D p2 = p + v*m_outer_radius + u*m_outer_radius;
	point3D p3 = p + v*m_outer_radius - u*m_outer_radius;
	//compute texture coordinates
	point3D t0 = point3D(0.5, 0.5, 0.5) + (p0 - m_p);
	point3D t1 = point3D(0.5, 0.5, 0.5) + (p1 - m_p);
	point3D t2 = point3D(0.5, 0.5, 0.5) + (p2 - m_p);
	point3D t3 = point3D(0.5, 0.5, 0.5) + (p3 - m_p);

	//enable texture mapping
	//glEnable(GL_TEXTURE_3D);
	glBindTexture(GL_TEXTURE_3D, m_volume_texture);

	//enable blending
	glDisable(GL_DEPTH_TEST);
	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

	glColor4f(1.0, 1.0, 1.0, 1.0);
	glBegin(GL_QUADS);
		glTexCoord3f(t0.x, t0.y, t0.z);
		glVertex3f(p0.x, p0.y, p0.z);
		glTexCoord3f(t1.x, t1.y, t1.z);
		glVertex3f(p1.x, p1.y, p1.z);
		glTexCoord3f(t2.x, t2.y, t2.z);
		glVertex3f(p2.x, p2.y, p2.z);
		glTexCoord3f(t3.x, t3.y, t3.z);
		glVertex3f(p3.x, p3.y, p3.z);
	glEnd();

	glDisable(GL_TEXTURE_3D);
	glDisable(GL_BLEND);

	
}
void rts_glVolumeViewer::RenderCameraSlice(point3D eye_point, vector3D camera_up, float slice_number)
{
	/*Renders a slice of the volume at the specified value (0 = closest
	to the camera while 1 = furthest from the camera).  The slice is oriented towards
	the camera position*/

	/*//get the vector from the volume to the eye point
	vector3D to_camera = eye_point - m_p;
	//normalize in order to compute the plane normal
	to_camera.normalize();
	
	//draw the camera-oriented plane
	m_draw_plane(m_p, to_camera, camera_up);*/

	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();

	//calculate the new basis functions
	vector3D to_camera = (eye_point - m_p);  to_camera.normalize();
	vector3D side = camera_up.cross(to_camera);  side.normalize();
	camera_up = to_camera.cross(side);  camera_up.normalize();
	//create the rotation matrix
	matrix4x4 mat_rotate(side, camera_up, to_camera);
	float gl_rotate[16];
	mat_rotate.gl_get_matrix(gl_rotate);

	//perform the geometric transformations
	glScalef(m_dimensions.x, m_dimensions.y, m_dimensions.z);
	glTranslatef(m_p.x, m_p.y, m_p.z);
	glMultMatrixf(gl_rotate);
	

	//perform the texture transformations
	glMatrixMode(GL_TEXTURE);
	glPushMatrix();
	glLoadIdentity();
	glScalef(m_source.get_dimx()/m_texture_size.x, 
			 m_source.get_dimy()/m_texture_size.y, 
			 m_source.get_dimz()/m_texture_size.z);
	glTranslatef(0.5, 0.5, 0.5);
	glMultMatrixf(gl_rotate);
	

	//enable texture mapping
	glEnable(GL_TEXTURE_3D);
	glBindTexture(GL_TEXTURE_3D, m_volume_texture);
	
	//enable blending
	//glDisable(GL_DEPTH_TEST);
	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

	//draw the planes
	glColor4f(1.0, 1.0, 1.0, 1.0);
	//PD.StartTimer(RENDER_PLANES);
	//glCallList(m_dl_planes);
	glBegin(GL_QUADS);
		glTexCoord3f(-m_outer_radius, -m_outer_radius, slice_number);
		glVertex3f(-m_outer_radius, -m_outer_radius, slice_number);
		glTexCoord3f(-m_outer_radius, m_outer_radius, slice_number);	
		glVertex3f(-m_outer_radius, m_outer_radius, slice_number);
		glTexCoord3f(m_outer_radius, m_outer_radius, slice_number);
		glVertex3f(m_outer_radius, m_outer_radius, slice_number);
		glTexCoord3f(m_outer_radius, -m_outer_radius, slice_number);
		glVertex3f(m_outer_radius, -m_outer_radius, slice_number);
	glEnd();
	
	//glFinish();
	//PD.EndTimer(RENDER_PLANES);

	glMatrixMode(GL_MODELVIEW);
	glPopMatrix();
	glMatrixMode(GL_TEXTURE);
	glPopMatrix();

	glDisable(GL_TEXTURE_3D);
	glDisable(GL_BLEND);


}

void rts_glVolumeViewer::RenderVolume(point3D eye_point, vector3D camera_up)
{
	if(m_volume_texture == 0)
		return;

	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();

	//calculate the new basis functions
	vector3D to_camera = (eye_point - m_p);  to_camera.normalize();
	vector3D side = camera_up.cross(to_camera);  side.normalize();
	camera_up = to_camera.cross(side);  camera_up.normalize();
	//create the rotation matrix
	matrix4x4 mat_rotate(side, camera_up, to_camera);
	float gl_rotate[16];
	mat_rotate.gl_get_matrix(gl_rotate);

	//perform the geometric transformations
	glScalef(m_dimensions.x, m_dimensions.y, m_dimensions.z);
	glTranslatef(m_p.x, m_p.y, m_p.z);
	glMultMatrixf(gl_rotate);
	

	//perform the texture transformations
	glMatrixMode(GL_TEXTURE);
	glPushMatrix();
	glLoadIdentity();
	glScalef(m_source.get_dimx()/m_texture_size.x, 
			 m_source.get_dimy()/m_texture_size.y, 
			 m_source.get_dimz()/m_texture_size.z);
	glTranslatef(0.5, 0.5, 0.5);
	glMultMatrixf(gl_rotate);
	

	//enable texture mapping
	glEnable(GL_TEXTURE_3D);
	glBindTexture(GL_TEXTURE_3D, m_volume_texture);
	
	//enable blending
	glDisable(GL_DEPTH_TEST);
	//glEnable(GL_DEPTH_TEST);
	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

	//draw the planes
	glColor4f(1.0, 1.0, 1.0, m_alpha_scale);
	PD.StartTimer(RENDER_PLANES);
	glCallList(m_dl_planes);
	glFinish();
	PD.EndTimer(RENDER_PLANES);

	glMatrixMode(GL_MODELVIEW);
	glPopMatrix();
	glMatrixMode(GL_TEXTURE);
	glPopMatrix();

	glDisable(GL_TEXTURE_3D);
	glDisable(GL_BLEND);
	glEnable(GL_DEPTH_TEST);
	

}

void rts_glVolumeViewer::SetNumPlanes(unsigned int planes)
{
	//set the number of planes
	m_num_planes = planes;

	//create the display list
	m_dl_planes = glGenLists(1);
	glNewList(m_dl_planes, GL_COMPILE);

	//the display planes run from (-m_outer_radius, m_outer_radius) in each dimension
	float z_step = 2.0*m_outer_radius/(planes + 1.0);
	glBegin(GL_QUADS);
	for(int z=0; z<planes; z++)
	{
		glTexCoord3f(-m_outer_radius, -m_outer_radius, -m_outer_radius+z*z_step);
		glVertex3f(-m_outer_radius, -m_outer_radius, -m_outer_radius+z*z_step);
		glTexCoord3f(-m_outer_radius, m_outer_radius, -m_outer_radius+z*z_step);
		glVertex3f(-m_outer_radius, m_outer_radius, -m_outer_radius+z*z_step);
		glTexCoord3f(m_outer_radius, m_outer_radius, -m_outer_radius+z*z_step);
		glVertex3f(m_outer_radius, m_outer_radius, -m_outer_radius+z*z_step);
		glTexCoord3f(m_outer_radius, -m_outer_radius, -m_outer_radius+z*z_step);
		glVertex3f(m_outer_radius, -m_outer_radius, -m_outer_radius+z*z_step);
	}
	glEnd();
	glEndList();
}

void rts_glVolumeViewer::SetSize(float x, float y, float z)
{
	m_dimensions.x = x;
	m_dimensions.y = y;
	m_dimensions.z = z;
}

void rts_glVolumeViewer::SetVoxelSize(float x, float y, float z)
{
	m_voxel_size.x = x;
	m_voxel_size.y = y;
	m_voxel_size.z = z;
	m_dimensions = vector3D(m_voxel_size.x * m_texture_size.x,
						    m_voxel_size.y * m_texture_size.y,
							m_voxel_size.z * m_texture_size.z);
	m_dimensions.normalize();
}

vector3D rts_glVolumeViewer::GetSize()
{
	return m_dimensions;
}

vector3D rts_glVolumeViewer::GetVoxelSize()
{
	return m_voxel_size;
}

void rts_glVolumeViewer::SetThreshold(unsigned char lower, unsigned char upper)
{
	//set the new threshold values
	m_min_threshold = lower;
	m_max_threshold = upper;

	//reload the texture map
	m_load_texture();
}

void rts_glVolumeViewer::Optimize(bool flag)
{
	//TODO Optimization causes a problem with texture sizing
	/*//if the user changed the setting, reload the texture
	if(m_optimize != flag)
	{
		m_optimize = flag;
		m_load_texture();
	}*/
	cout<<"Optimization has been removed due to bugs"<<endl;
	
	
}

void rts_glVolumeViewer::Invert()
{
	//this function inverts the original data set
	m_source.invert();
	m_load_texture();
}

void rts_glVolumeViewer::m_load_texture()
{
	//duplicate the source data
	PD.StartTimer(LOAD_TEXTURE);
	rtsVolume texture_volume = m_source;

	//place a black border around the volume
	PD.StartTimer(BLACKEN_BORDERS);
	texture_volume.blacken_border();
	PD.EndTimer(BLACKEN_BORDERS);

	if(m_min_threshold > 0)
		texture_volume.blacken(m_min_threshold);
	if(m_max_threshold < 255)
		texture_volume.whiten(m_max_threshold);

	
	//if we are optimizing the texture, make the dimensions a power-of-two
	if(m_optimize)
	{
		PD.StartTimer(RESIZE_DATA);
		//find the maximum dimension
		unsigned int max_dimension = max(max(m_source.get_dimx(), m_source.get_dimy()), m_source.get_dimz());
		
		unsigned int new_dimension = 2;
		//calculate the new dimension
		while(new_dimension < max_dimension)
			new_dimension *= 2;
		//resize the texture volume
		texture_volume.resize_canvas(new_dimension, new_dimension, new_dimension);
		PD.EndTimer(RESIZE_DATA);
	}

	//apply the new image to the texture
	glBindTexture(GL_TEXTURE_3D, m_volume_texture);
	unsigned int dimx = texture_volume.get_dimx();
	unsigned int dimy = texture_volume.get_dimy();
	unsigned int dimz = texture_volume.get_dimz();
	m_texture_size = vector3D((double)dimx, (double)dimy, (double)dimz);
	unsigned char* bits = texture_volume.get_bits();
	glTexImage3D(GL_TEXTURE_3D, 0, GL_ALPHA8, dimx, dimy, dimz, 0, GL_ALPHA, 
				 GL_UNSIGNED_BYTE, bits);

	PD.EndTimer(LOAD_TEXTURE);

}