1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/viewer.cc	Wed Dec 31 07:53:53 2014 +0200
     1.3 @@ -0,0 +1,248 @@
     1.4 +#include <stdio.h>
     1.5 +#include <stdlib.h>
     1.6 +#include "opengl.h"
     1.7 +#include "viewer.h"
     1.8 +#include "rend_fast.h"
     1.9 +#include "opt.h"
    1.10 +#include "volume.h"
    1.11 +#include "xfer_view.h"
    1.12 +
    1.13 +static int win_width, win_height;
    1.14 +static float cam_theta, cam_phi, cam_dist = 4;
    1.15 +static float pre_rot = -90;
    1.16 +static int splitter_y = -1;
    1.17 +
    1.18 +#define SPLITTER_WIDTH			5
    1.19 +
    1.20 +static Renderer *rend;
    1.21 +static Volume *vol;
    1.22 +static TransferFunc *xfer;
    1.23 +
    1.24 +extern "C" {
    1.25 +
    1.26 +int init()
    1.27 +{
    1.28 +	if(!opt.fname) {
    1.29 +		fprintf(stderr, "you must specify the volume data filename\n");
    1.30 +		return -1;
    1.31 +	}
    1.32 +
    1.33 +	switch(opt.rend_type) {
    1.34 +	case REND_FAST:
    1.35 +		rend = new RendererFast;
    1.36 +		break;
    1.37 +	default:
    1.38 +		return -1;
    1.39 +	}
    1.40 +
    1.41 +	if(!rend->init()) {
    1.42 +		fprintf(stderr, "renderer initialization failed\n");
    1.43 +		return -1;
    1.44 +	}
    1.45 +
    1.46 +	VoxelVolume *voxvol = new VoxelVolume;
    1.47 +	if(!voxvol->load(opt.fname)) {
    1.48 +		fprintf(stderr, "failed to load volume data from: %s\n", opt.fname);
    1.49 +		return -1;
    1.50 +	}
    1.51 +	vol = voxvol;
    1.52 +	rend->set_volume(vol);
    1.53 +
    1.54 +	xfer = new TransferWindow;
    1.55 +	rend->set_transfer_function(xfer);
    1.56 +
    1.57 +	if(!xfview_init(xfer)) {
    1.58 +		return -1;
    1.59 +	}
    1.60 +
    1.61 +	return 0;
    1.62 +}
    1.63 +
    1.64 +void cleanup()
    1.65 +{
    1.66 +	xfview_destroy();
    1.67 +
    1.68 +	rend->destroy();
    1.69 +	delete rend;
    1.70 +	delete vol;
    1.71 +	delete xfer;
    1.72 +}
    1.73 +
    1.74 +void ev_display()
    1.75 +{
    1.76 +	glClear(GL_COLOR_BUFFER_BIT);
    1.77 +
    1.78 +	// render the main view
    1.79 +	glViewport(0, win_height - splitter_y, win_width, splitter_y);
    1.80 +
    1.81 +	glMatrixMode(GL_PROJECTION);
    1.82 +	glLoadIdentity();
    1.83 +	gluPerspective(50.0, (float)win_width / (float)splitter_y, 0.1, 100.0);
    1.84 +
    1.85 +	glMatrixMode(GL_MODELVIEW);
    1.86 +	glLoadIdentity();
    1.87 +	glTranslatef(0, 0, -cam_dist);
    1.88 +	glRotatef(cam_phi + pre_rot, 1, 0, 0);
    1.89 +	glRotatef(cam_theta, 0, 1, 0);
    1.90 +
    1.91 +	rend->update(0);
    1.92 +	rend->render();
    1.93 +
    1.94 +	// draw the transfer function view
    1.95 +	glViewport(0, 0, win_width, win_height - splitter_y);
    1.96 +
    1.97 +	xfview_draw();
    1.98 +
    1.99 +	// draw the GUI
   1.100 +	glViewport(0, 0, win_width, win_height);
   1.101 +
   1.102 +	glMatrixMode(GL_PROJECTION);
   1.103 +	glLoadIdentity();
   1.104 +	glOrtho(0, win_width, win_height, 0, -1, 1);
   1.105 +
   1.106 +	glMatrixMode(GL_MODELVIEW);
   1.107 +	glLoadIdentity();
   1.108 +
   1.109 +	glBegin(GL_QUADS);
   1.110 +	glColor3f(1, 1, 1);
   1.111 +	glVertex2f(0, splitter_y + SPLITTER_WIDTH / 2);
   1.112 +	glVertex2f(win_width, splitter_y + SPLITTER_WIDTH / 2);
   1.113 +	glVertex2f(win_width, splitter_y - SPLITTER_WIDTH / 2);
   1.114 +	glVertex2f(0, splitter_y - SPLITTER_WIDTH / 2);
   1.115 +	glEnd();
   1.116 +
   1.117 +	swap_buffers();
   1.118 +}
   1.119 +
   1.120 +void ev_reshape(int x, int y)
   1.121 +{
   1.122 +	if(splitter_y < 0) {	// not initialized yet
   1.123 +		splitter_y = (int)(y * 0.85);
   1.124 +	} else {
   1.125 +		// calculate where the splitter was relative to the window height
   1.126 +		// and based on that, it's new position
   1.127 +		float split = (float)splitter_y / (float)win_height;
   1.128 +		splitter_y = (int)(y * split);
   1.129 +	}
   1.130 +
   1.131 +	win_width = x;
   1.132 +	win_height = y;
   1.133 +
   1.134 +	glViewport(0, 0, x, y);
   1.135 +	if(rend) {
   1.136 +		rend->reshape(x, y);
   1.137 +	}
   1.138 +}
   1.139 +
   1.140 +static bool zscaling;
   1.141 +
   1.142 +void ev_keyboard(int key, int press, int x, int y)
   1.143 +{
   1.144 +	RendererFast *fr;
   1.145 +
   1.146 +	switch(key) {
   1.147 +	case 27:
   1.148 +		if(press) {
   1.149 +			quit();
   1.150 +		}
   1.151 +		break;
   1.152 +
   1.153 +	case 'z':
   1.154 +	case 'Z':
   1.155 +		zscaling = press;
   1.156 +		break;
   1.157 +
   1.158 +	case '=':
   1.159 +		if(press && (fr = dynamic_cast<RendererFast*>(rend))) {
   1.160 +			int n = fr->get_proxy_count();
   1.161 +			int add = n / 4;
   1.162 +			n += add < 1 ? 1 : add;
   1.163 +			printf("proxy count: %d\n", n);
   1.164 +			fr->set_proxy_count(n);
   1.165 +			redisplay();
   1.166 +		}
   1.167 +		break;
   1.168 +
   1.169 +	case '-':
   1.170 +		if(press && (fr = dynamic_cast<RendererFast*>(rend))) {
   1.171 +			int n = fr->get_proxy_count();
   1.172 +			int sub = n / 4;
   1.173 +			n -= sub < 1 ? 1 : sub;
   1.174 +
   1.175 +			if(n < 1) n = 1;
   1.176 +
   1.177 +			printf("proxy count: %d\n", n);
   1.178 +			fr->set_proxy_count(n);
   1.179 +			redisplay();
   1.180 +		}
   1.181 +		break;
   1.182 +
   1.183 +	default:
   1.184 +		break;
   1.185 +	}
   1.186 +}
   1.187 +
   1.188 +static bool bnstate[8];
   1.189 +static int prev_x, prev_y;
   1.190 +
   1.191 +#define ON_SPLITTER(y)	(abs(y - splitter_y) <= SPLITTER_WIDTH / 2)
   1.192 +static bool splitter_dragging;
   1.193 +
   1.194 +void ev_mouse_button(int bn, int press, int x, int y)
   1.195 +{
   1.196 +	bnstate[bn] = press != 0;
   1.197 +	prev_x = x;
   1.198 +	prev_y = y;
   1.199 +
   1.200 +	splitter_dragging = bn == 0 && press && ON_SPLITTER(y);
   1.201 +
   1.202 +	if(!splitter_dragging && y > splitter_y) {
   1.203 +		xfview_button(bn, press, x, y);
   1.204 +	}
   1.205 +}
   1.206 +
   1.207 +void ev_mouse_motion(int x, int y)
   1.208 +{
   1.209 +	int dx = x - prev_x;
   1.210 +	int dy = y - prev_y;
   1.211 +	prev_x = x;
   1.212 +	prev_y = y;
   1.213 +
   1.214 +	if((dx | dy) == 0) return;
   1.215 +
   1.216 +	if(bnstate[0] && zscaling) {
   1.217 +		float s = rend->get_zscale() + (float)dy / (float)win_height;
   1.218 +		rend->set_zscale(s < 0.0 ? 0.0 : s);
   1.219 +		redisplay();
   1.220 +		return;
   1.221 +	}
   1.222 +
   1.223 +	if(splitter_dragging) {
   1.224 +		splitter_y += dy;
   1.225 +		redisplay();
   1.226 +		return;
   1.227 +	}
   1.228 +
   1.229 +	if(y > splitter_y) {
   1.230 +		xfview_motion(x, y);
   1.231 +		return;
   1.232 +	}
   1.233 +
   1.234 +	// main view motion handling
   1.235 +	if(bnstate[0]) {
   1.236 +		cam_theta += dx * 0.5;
   1.237 +		cam_phi += dy * 0.5;
   1.238 +
   1.239 +		if(cam_phi < -90) cam_phi = -90;
   1.240 +		if(cam_phi > 90) cam_phi = 90;
   1.241 +		redisplay();
   1.242 +	}
   1.243 +	if(bnstate[2]) {
   1.244 +		cam_dist += dy * 0.1;
   1.245 +
   1.246 +		if(cam_dist < 0.0) cam_dist = 0.0;
   1.247 +		redisplay();
   1.248 +	}
   1.249 +}
   1.250 +
   1.251 +}	// extern "C"