nuclear@0: #include <stdio.h>
nuclear@3: #include <stdlib.h>
nuclear@2: #include <string.h>
nuclear@27: #include <ctype.h>
nuclear@2: #include <errno.h>
nuclear@3: #ifndef __APPLE__
nuclear@3: #include <GL/glut.h>
nuclear@3: #else
nuclear@3: #include <GLUT/glut.h>
nuclear@3: #endif
nuclear@3: #include "rt.h"
nuclear@12: #include "matrix.h"
nuclear@22: #include "scene.h"
nuclear@0: 
nuclear@3: void cleanup();
nuclear@3: void disp();
nuclear@3: void reshape(int x, int y);
nuclear@3: void keyb(unsigned char key, int x, int y);
nuclear@3: void mouse(int bn, int status, int x, int y);
nuclear@3: void motion(int x, int y);
nuclear@2: bool write_ppm(const char *fname, float *fb, int xsz, int ysz);
nuclear@2: 
nuclear@3: static int xsz, ysz;
nuclear@3: static bool need_update = true;
nuclear@3: 
nuclear@8: static float cam_theta, cam_phi = 25.0;
nuclear@8: static float cam_dist = 10.0;
nuclear@8: 
nuclear@27: static bool dbg_glrender = true;
nuclear@27: static bool dbg_show_kdtree = false;
nuclear@27: static bool dbg_show_obj = true;
nuclear@13: 
nuclear@13: static Scene scn;
nuclear@12: 
nuclear@3: int main(int argc, char **argv)
nuclear@0: {
nuclear@3: 	glutInitWindowSize(800, 600);
nuclear@3: 	glutInit(&argc, argv);
nuclear@13: 
nuclear@13: 	int loaded = 0;
nuclear@13: 	for(int i=1; i<argc; i++) {
nuclear@27: 		if(argv[i][0] == '-' && argv[i][2] == 0) {
nuclear@27: 			switch(argv[i][1]) {
nuclear@27: 			case 'i':
nuclear@27: 				if(!argv[++i] || !isdigit(argv[i][0])) {
nuclear@27: 					fprintf(stderr, "-i must be followed by the intersection cost\n");
nuclear@27: 					return 1;
nuclear@27: 				}
nuclear@27: 
nuclear@27: 				set_accel_param(ACCEL_PARAM_COST_INTERSECT, atoi(argv[i]));
nuclear@27: 				break;
nuclear@27: 
nuclear@27: 			case 't':
nuclear@27: 				if(!argv[++i] || !isdigit(argv[i][0])) {
nuclear@27: 					fprintf(stderr, "-t must be followed by the traversal cost\n");
nuclear@27: 					return 1;
nuclear@27: 				}
nuclear@27: 
nuclear@27: 				set_accel_param(ACCEL_PARAM_COST_TRAVERSE, atoi(argv[i]));
nuclear@27: 				break;
nuclear@27: 
nuclear@27: 			case 'c':
nuclear@27: 				if(!argv[++i] || !isdigit(argv[i][0])) {
nuclear@27: 					fprintf(stderr, "-c must be followed by the max number of items per leaf node\n");
nuclear@27: 					return 1;
nuclear@27: 				}
nuclear@27: 
nuclear@27: 				set_accel_param(ACCEL_PARAM_MAX_NODE_ITEMS, atoi(argv[i]));
nuclear@27: 				break;
nuclear@27: 
nuclear@27: 			default:
nuclear@27: 				fprintf(stderr, "unrecognized option: %s\n", argv[i]);
nuclear@27: 				return 1;
nuclear@27: 			}
nuclear@27: 		} else {
nuclear@27: 			if(!scn.load(argv[i])) {
nuclear@27: 				fprintf(stderr, "failed to load scene: %s\n", argv[i]);
nuclear@27: 				return false;
nuclear@27: 			}
nuclear@27: 			loaded++;
nuclear@13: 		}
nuclear@13: 	}
nuclear@13: 
nuclear@13: 	if(!loaded) {
nuclear@13: 		fprintf(stderr, "you must specify a scene file to load\n");
nuclear@13: 		return false;
nuclear@13: 	}
nuclear@13: 	if(!scn.get_num_faces()) {
nuclear@13: 		fprintf(stderr, "didn't load any polygons\n");
nuclear@13: 		return false;
nuclear@13: 	}
nuclear@13: 
nuclear@18: 	glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
nuclear@3: 	glutCreateWindow("OpenCL Raytracer");
nuclear@0: 
nuclear@3: 	xsz = glutGet(GLUT_WINDOW_WIDTH);
nuclear@3: 	ysz = glutGet(GLUT_WINDOW_HEIGHT);
nuclear@2: 
nuclear@3: 	glutDisplayFunc(disp);
nuclear@3: 	glutReshapeFunc(reshape);
nuclear@3: 	glutKeyboardFunc(keyb);
nuclear@3: 	glutMouseFunc(mouse);
nuclear@3: 	glutMotionFunc(motion);
nuclear@0: 
nuclear@13: 	if(!init_renderer(xsz, ysz, &scn)) {
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@3: 	atexit(cleanup);
nuclear@0: 
nuclear@27: 	if(!scn.build_kdtree()) {
nuclear@27: 		return 1;
nuclear@27: 	}
nuclear@27: 
nuclear@27: 
nuclear@3: 	/*glGenTextures(1, &tex);
nuclear@3: 	glBindTexture(GL_TEXTURE_2D, tex);*/
nuclear@3: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
nuclear@3: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
nuclear@3: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@3: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@3: 	glTexImage2D(GL_TEXTURE_2D, 0, 4, xsz, ysz, 0, GL_RGBA, GL_FLOAT, 0);
nuclear@2: 
nuclear@3: 	glutMainLoop();
nuclear@0: 	return 0;
nuclear@0: }
nuclear@2: 
nuclear@3: void cleanup()
nuclear@2: {
nuclear@3: 	destroy_renderer();
nuclear@3: }
nuclear@2: 
nuclear@12: static Matrix4x4 mat, inv_mat, inv_trans;
nuclear@12: 
nuclear@3: void disp()
nuclear@3: {
nuclear@8: 	glMatrixMode(GL_MODELVIEW);
nuclear@8: 	glLoadIdentity();
nuclear@8: 
nuclear@3: 	if(need_update) {
nuclear@12: 		glPushMatrix();
nuclear@12: 		glRotatef(-cam_theta, 0, 1, 0);
nuclear@12: 		glRotatef(-cam_phi, 1, 0, 0);
nuclear@12: 		glTranslatef(0, 0, cam_dist);
nuclear@8: 
nuclear@12: 		glGetFloatv(GL_MODELVIEW_MATRIX, mat.m);
nuclear@8: 
nuclear@12: 		inv_mat = mat;
nuclear@12: 		inv_mat.invert();
nuclear@12: 
nuclear@12: 		/*inv_trans = inv_mat;
nuclear@12: 		inv_trans.transpose();*/
nuclear@12: 		inv_trans = mat;
nuclear@12: 		inv_trans.m[3] = inv_trans.m[7] = inv_trans.m[11] = 0.0;
nuclear@12: 		inv_trans.m[12] = inv_trans.m[13] = inv_trans.m[14] = 0.0;
nuclear@12: 		inv_trans.m[15] = 1.0;
nuclear@12: 
nuclear@12: 		set_xform(mat.m, inv_trans.m);
nuclear@8: 		glPopMatrix();
nuclear@8: 
nuclear@13: 		if(!dbg_glrender) {
nuclear@13: 			if(!render()) {
nuclear@13: 				exit(1);
nuclear@13: 			}
nuclear@13: 			need_update = false;
nuclear@12: 		}
nuclear@3: 	}
nuclear@2: 
nuclear@12: 	if(dbg_glrender) {
nuclear@12: 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@12: 		glLoadMatrixf(inv_mat.m);
nuclear@27: 		dbg_render_gl(&scn, dbg_show_kdtree, dbg_show_obj);
nuclear@12: 	} else {
nuclear@12: 		glEnable(GL_TEXTURE_2D);
nuclear@22: 		glDisable(GL_LIGHTING);
nuclear@2: 
nuclear@12: 		glBegin(GL_QUADS);
nuclear@12: 		glColor3f(1, 1, 1);
nuclear@12: 		glTexCoord2f(0, 1); glVertex2f(-1, -1);
nuclear@12: 		glTexCoord2f(1, 1); glVertex2f(1, -1);
nuclear@12: 		glTexCoord2f(1, 0); glVertex2f(1, 1);
nuclear@12: 		glTexCoord2f(0, 0); glVertex2f(-1, 1);
nuclear@12: 		glEnd();
nuclear@2: 
nuclear@12: 		glDisable(GL_TEXTURE_2D);
nuclear@12: 	}
nuclear@3: 
nuclear@3: 	glutSwapBuffers();
nuclear@3: }
nuclear@3: 
nuclear@3: void reshape(int x, int y)
nuclear@3: {
nuclear@3: 	glViewport(0, 0, x, y);
nuclear@3: 
nuclear@3: 	/* reallocate the framebuffer */
nuclear@3: 	/*delete [] fb;
nuclear@3: 	fb = new float[x * y * 4];
nuclear@3: 	set_framebuffer(fb, x, y);*/
nuclear@3: }
nuclear@3: 
nuclear@3: void keyb(unsigned char key, int x, int y)
nuclear@3: {
nuclear@3: 	switch(key) {
nuclear@3: 	case 27:
nuclear@3: 		exit(0);
nuclear@3: 
nuclear@12: 	case 'r':
nuclear@12: 		need_update = true;
nuclear@12: 		glutPostRedisplay();
nuclear@3: 		break;
nuclear@3: 
nuclear@12: 	case 'd':
nuclear@12: 		dbg_glrender = !dbg_glrender;
nuclear@12: 		if(dbg_glrender) {
nuclear@21: 			printf("Debug OpenGL rendering\n");
nuclear@21: 		} else {
nuclear@21: 			printf("Raytracing\n");
nuclear@12: 		}
nuclear@3: 		glutPostRedisplay();
nuclear@3: 		break;
nuclear@3: 
nuclear@27: 	case 'k':
nuclear@27: 		dbg_show_kdtree = !dbg_show_kdtree;
nuclear@27: 		if(dbg_glrender) {
nuclear@27: 			glutPostRedisplay();
nuclear@27: 		}
nuclear@27: 		break;
nuclear@27: 
nuclear@27: 	case 'o':
nuclear@27: 		dbg_show_obj = !dbg_show_obj;
nuclear@27: 		if(dbg_glrender) {
nuclear@27: 			glutPostRedisplay();
nuclear@27: 		}
nuclear@27: 		break;
nuclear@27: 
nuclear@3: 	default:
nuclear@3: 		break;
nuclear@3: 	}
nuclear@3: }
nuclear@3: 
nuclear@8: static bool bnstate[32];
nuclear@8: static int prev_x, prev_y;
nuclear@8: 
nuclear@3: void mouse(int bn, int state, int x, int y)
nuclear@3: {
nuclear@8: 	if(state == GLUT_DOWN) {
nuclear@8: 		prev_x = x;
nuclear@8: 		prev_y = y;
nuclear@8: 		bnstate[bn] = true;
nuclear@8: 	} else {
nuclear@8: 		bnstate[bn] = false;
nuclear@8: 	}
nuclear@3: }
nuclear@3: 
nuclear@8: #define ROT_SCALE	0.5
nuclear@8: #define PAN_SCALE	0.1
nuclear@8: 
nuclear@3: void motion(int x, int y)
nuclear@3: {
nuclear@8: 	int dx = x - prev_x;
nuclear@8: 	int dy = y - prev_y;
nuclear@8: 	prev_x = x;
nuclear@8: 	prev_y = y;
nuclear@8: 
nuclear@8: 	if(bnstate[0]) {
nuclear@8: 		cam_theta += dx * ROT_SCALE;
nuclear@8: 		cam_phi += dy * ROT_SCALE;
nuclear@8: 
nuclear@12: 		if(cam_phi < -89) cam_phi = -89;
nuclear@8: 		if(cam_phi > 89) cam_phi = 89;
nuclear@8: 
nuclear@8: 		need_update = true;
nuclear@8: 		glutPostRedisplay();
nuclear@8: 	}
nuclear@8: 	if(bnstate[2]) {
nuclear@8: 		cam_dist += dy * PAN_SCALE;
nuclear@8: 		if(cam_dist < 0) cam_dist = 0;
nuclear@8: 
nuclear@8: 		need_update = true;
nuclear@8: 		glutPostRedisplay();
nuclear@8: 	}
nuclear@2: }
nuclear@2: 
nuclear@2: bool write_ppm(const char *fname, float *fb, int xsz, int ysz)
nuclear@2: {
nuclear@2: 	FILE *fp;
nuclear@2: 
nuclear@2: 	if(!(fp = fopen(fname, "wb"))) {
nuclear@2: 		fprintf(stderr, "write_ppm: failed to open file %s for writing: %s\n", fname, strerror(errno));
nuclear@2: 		return false;
nuclear@2: 	}
nuclear@2: 	fprintf(fp, "P6\n%d %d\n255\n", xsz, ysz);
nuclear@2: 
nuclear@2: 	for(int i=0; i<xsz * ysz * 4; i++) {
nuclear@2: 		if(i % 4 == 3) continue;
nuclear@2: 
nuclear@2: 		unsigned char c = (unsigned char)(fb[i] * 255.0);
nuclear@2: 		fputc(c, fp);
nuclear@2: 	}
nuclear@2: 	fclose(fp);
nuclear@2: 	return true;
nuclear@2: }