nuclear@0: #include <stdio.h>
nuclear@0: #include <stdlib.h>
nuclear@0: #include <string.h>
nuclear@0: #include <math.h>
nuclear@0: #include <assert.h>
nuclear@0: #include <imago2.h>
nuclear@0: #include "app.h"
nuclear@0: #include "opengl.h"
nuclear@0: #include "texture.h"
nuclear@0: #include "mesh.h"
nuclear@0: #include "meshgen.h"
nuclear@0: 
nuclear@0: static void draw_scene();	// both near and infinite parts
nuclear@0: static void draw_scene_near();	// near scene: regular objects affected by parallax shift and translation
nuclear@0: // infinity scene: objects conceptually at infinity, not affected by parallax shift and translation
nuclear@0: static void draw_scene_inf();
nuclear@0: static bool parse_args(int argc, char **argv);
nuclear@0: 
nuclear@0: static const char *img_fname;
nuclear@0: static float cam_theta, cam_phi;
nuclear@0: 
nuclear@0: static Texture *pano_tex;
nuclear@0: static Mesh *pano_mesh;
nuclear@0: 
nuclear@0: static int win_width, win_height;
nuclear@0: 
nuclear@0: 
nuclear@0: bool app_init(int argc, char **argv)
nuclear@0: {
nuclear@0: 	if(!parse_args(argc, argv)) {
nuclear@0: 		return false;
nuclear@0: 	}
nuclear@0: 	if(!img_fname) {
nuclear@0: 		fprintf(stderr, "please specify an equilateral panoramic image\n");
nuclear@0: 		return false;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	if(!init_opengl()) {
nuclear@0: 		return false;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	glEnable(GL_CULL_FACE);
nuclear@0: 
nuclear@0: 	if(GLEW_ARB_framebuffer_sRGB) {
nuclear@0: 		glGetError();	// discard previous errors
nuclear@0: 		glEnable(GL_FRAMEBUFFER_SRGB);
nuclear@0: 		if(glGetError() != GL_NO_ERROR) {
nuclear@0: 			fprintf(stderr, "failed to enable sRGB framebuffer\n");
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	Mesh::use_custom_sdr_attr = false;
nuclear@0: 	pano_mesh = new Mesh;
nuclear@0: 	gen_sphere(pano_mesh, 1.0, 80, 40);
nuclear@0: 	pano_mesh->flip();
nuclear@0: 	Mat4 xform;
nuclear@0: 	xform.rotation_y(-M_PI / 2.0);	// rotate the sphere to face the "front" part of the image
nuclear@0: 	pano_mesh->apply_xform(xform, xform);
nuclear@0: 
nuclear@0: 	xform.scaling(-1, 1, 1);		// flip horizontal texcoord since we're inside the sphere
nuclear@0: 	pano_mesh->texcoord_apply_xform(xform);
nuclear@0: 
nuclear@0: 	pano_tex = new Texture;
nuclear@0: 	if(!pano_tex->load(img_fname)) {
nuclear@0: 		return false;
nuclear@0: 	}
nuclear@0: 	return true;
nuclear@0: }
nuclear@0: 
nuclear@0: void app_cleanup()
nuclear@0: {
nuclear@0: 	delete pano_mesh;
nuclear@0: 	delete pano_tex;
nuclear@0: }
nuclear@0: 
nuclear@0: void app_draw()
nuclear@0: {
nuclear@0: 	glClear(GL_COLOR_BUFFER_BIT);
nuclear@0: 
nuclear@0: 	Mat4 view_matrix;
nuclear@0: 	view_matrix.pre_rotate_x(deg_to_rad(cam_phi));
nuclear@0: 	view_matrix.pre_rotate_y(deg_to_rad(cam_theta));
nuclear@0: 
nuclear@0: 	glMatrixMode(GL_MODELVIEW);
nuclear@0: 	glLoadMatrixf(view_matrix[0]);
nuclear@0: 
nuclear@0: 	draw_scene();
nuclear@0: 
nuclear@0: 	app_swap_buffers();
nuclear@0: 	assert(glGetError() == GL_NO_ERROR);
nuclear@0: }
nuclear@0: 
nuclear@0: void render_cubemap()
nuclear@0: {
nuclear@0: 	int fbsize = win_width < win_height ? win_width : win_height;
nuclear@0: 	float *pixels = new float[fbsize * fbsize * 3];
nuclear@0: 
nuclear@0: 	glViewport(0, 0, fbsize, fbsize);
nuclear@0: 
nuclear@0: 	Mat4 viewmat[6];
nuclear@0: 	viewmat[0].rotation_y(deg_to_rad(90));	// +X
nuclear@0: 	viewmat[1].rotation_x(deg_to_rad(-90));	// +Y
nuclear@0: 	viewmat[2].rotation_y(deg_to_rad(180));	// +Z
nuclear@0: 	viewmat[3].rotation_y(deg_to_rad(-90));	// -X
nuclear@0: 	viewmat[4].rotation_x(deg_to_rad(90));	// -Y
nuclear@0: 
nuclear@0: 	static const char *fname[] = {
nuclear@0: 		"cubemap_px.jpg",
nuclear@0: 		"cubemap_py.jpg",
nuclear@0: 		"cubemap_pz.jpg",
nuclear@0: 		"cubemap_nx.jpg",
nuclear@0: 		"cubemap_ny.jpg",
nuclear@0: 		"cubemap_nz.jpg"
nuclear@0: 	};
nuclear@0: 
nuclear@0: 	glMatrixMode(GL_PROJECTION);
nuclear@0: 	glLoadIdentity();
nuclear@0: 	gluPerspective(45, 1.0, 0.5, 500.0);
nuclear@0: 
nuclear@0: 	for(int i=0; i<6; i++) {
nuclear@0: 		glClear(GL_COLOR_BUFFER_BIT);
nuclear@0: 
nuclear@0: 		glMatrixMode(GL_MODELVIEW);
nuclear@0: 		glLoadMatrixf(viewmat[i][0]);
nuclear@0: 
nuclear@0: 		draw_scene();
nuclear@0: 
nuclear@0: 		glReadPixels(0, 0, fbsize, fbsize, GL_RGB, GL_FLOAT, pixels);
nuclear@0: 		if(img_save_pixels(fname[i], pixels, fbsize, fbsize, IMG_FMT_RGBF) == -1) {
nuclear@0: 			fprintf(stderr, "failed to save %dx%d image: %s\n", fbsize, fbsize, fname[i]);
nuclear@0: 			break;
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	glViewport(0, 0, win_width, win_height);
nuclear@0: 
nuclear@0: 	delete [] pixels;
nuclear@0: }
nuclear@0: 
nuclear@0: // both near and infinite parts (see below)
nuclear@0: static void draw_scene()
nuclear@0: {
nuclear@0: 	draw_scene_inf();
nuclear@0: 	draw_scene_near();
nuclear@0: }
nuclear@0: 
nuclear@0: // infinity scene: objects conceptually at infinity, not affected by parallax shift and translation
nuclear@0: static void draw_scene_inf()
nuclear@0: {
nuclear@0: 	pano_tex->bind();
nuclear@0: 	glEnable(GL_TEXTURE_2D);
nuclear@0: 	pano_mesh->draw();
nuclear@0: 	glDisable(GL_TEXTURE_2D);
nuclear@0: }
nuclear@0: 
nuclear@0: // near scene: regular objects affected by parallax shift and translation
nuclear@0: static void draw_scene_near()
nuclear@0: {
nuclear@0: }
nuclear@0: 
nuclear@0: void app_reshape(int x, int y)
nuclear@0: {
nuclear@0: 	glViewport(0, 0, x, y);
nuclear@0: 
nuclear@0: 	glMatrixMode(GL_PROJECTION);
nuclear@0: 	glLoadIdentity();
nuclear@0: 	gluPerspective(50.0, (float)x / (float)y, 0.5, 500.0);
nuclear@0: 
nuclear@0: 	win_width = x;
nuclear@0: 	win_height = y;
nuclear@0: }
nuclear@0: 
nuclear@0: void app_keyboard(int key, bool press)
nuclear@0: {
nuclear@0: 	if(press) {
nuclear@0: 		switch(key) {
nuclear@0: 		case 27:
nuclear@0: 			app_quit();
nuclear@0: 			break;
nuclear@0: 
nuclear@0: 		case 's':
nuclear@0: 			printf("rendering cubemap\n");
nuclear@0: 			render_cubemap();
nuclear@0: 			break;
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: static float prev_x, prev_y;
nuclear@0: static bool bnstate[16];
nuclear@0: 
nuclear@0: void app_mouse_button(int bn, bool press, int x, int y)
nuclear@0: {
nuclear@0: 	if(bn < (int)(sizeof bnstate / sizeof *bnstate)) {
nuclear@0: 		bnstate[bn] = press;
nuclear@0: 	}
nuclear@0: 	prev_x = x;
nuclear@0: 	prev_y = y;
nuclear@0: }
nuclear@0: 
nuclear@0: void app_mouse_motion(int x, int y)
nuclear@0: {
nuclear@0: 	float dx = x - prev_x;
nuclear@0: 	float dy = y - prev_y;
nuclear@0: 	prev_x = x;
nuclear@0: 	prev_y = y;
nuclear@0: 
nuclear@0: 	if(!dx && !dy) return;
nuclear@0: 
nuclear@0: 	if(bnstate[0]) {
nuclear@0: 		cam_theta += dx * 0.5;
nuclear@0: 		cam_phi += dy * 0.5;
nuclear@0: 
nuclear@0: 		if(cam_phi < -90) cam_phi = -90;
nuclear@0: 		if(cam_phi > 90) cam_phi = 90;
nuclear@0: 		app_redisplay();
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: static bool parse_args(int argc, char **argv)
nuclear@0: {
nuclear@0: 	for(int i=1; i<argc; i++) {
nuclear@0: 		if(argv[i][0] == '-') {
nuclear@0: 			/*
nuclear@0: 			} else if(strcmp(argv[i], "-help") == 0) {
nuclear@0: 				printf("usage: %s [options]\noptions:\n", argv[0]);
nuclear@0: 				printf(" -help: print usage information and exit\n");
nuclear@0: 				exit(0);
nuclear@0: 			} else {*/
nuclear@0: 				fprintf(stderr, "invalid option: %s\n", argv[i]);
nuclear@0: 				return false;
nuclear@0: 			//}
nuclear@0: 		} else {
nuclear@0: 			if(img_fname) {
nuclear@0: 				fprintf(stderr, "unexpected option: %s\n", argv[i]);
nuclear@0: 				return false;
nuclear@0: 			}
nuclear@0: 			img_fname = argv[i];
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	return true;
nuclear@0: }