[vrfileman] / src / app.cc

#include <stdio.h>
#include <assert.h>
#include "opengl.h"
#include "app.h"
#include "gmath/gmath.h"
#include "mesh.h"
#include "meshgen.h"
#include "backdrop.h"
#include "goatvr.h"

static bool parse_args(int argc, char **argv);

int win_width, win_height;
float win_aspect;
long time_msec;

static bool use_vr;
static bool should_swap;

static float cam_theta, cam_phi;
static float cam_height = 1.65;
static Mesh *mesh_torus;

static bool bnstate[16];
static int prev_x, prev_y;

bool app_init(int argc, char **argv)
{
        if(!parse_args(argc, argv)) {
                return false;
        }
        if(init_opengl() == -1) {
                return false;
        }

        glEnable(GL_MULTISAMPLE);

        int aasamples = 0;
        glGetIntegerv(GL_SAMPLES, &aasamples);
        printf("got %d samples per pixel\n", aasamples);

        glEnable(GL_CULL_FACE);
        glEnable(GL_DEPTH_TEST);
        //glEnable(GL_LIGHTING);
        glEnable(GL_LIGHT0);

        if(GLEW_ARB_framebuffer_sRGB) {
                glEnable(GL_FRAMEBUFFER_SRGB);
        }

        if(use_vr) {
                if(goatvr_init() == -1) {
                        return false;
                }
                goatvr_set_origin_mode(GOATVR_HEAD);

                goatvr_startvr();
                should_swap = goatvr_should_swap() != 0;
                cam_height = goatvr_get_eye_height();
        }

        Mesh::use_custom_sdr_attr = false;

        mesh_torus = new Mesh;
        gen_torus(mesh_torus, 1.0, 0.25, 32, 32);

        if(!init_backdrop()) {
                return false;
        }

        return true;
}

void app_cleanup()
{
        if(use_vr) {
                goatvr_shutdown();
        }
        delete mesh_torus;
        cleanup_backdrop();
}

void app_draw()
{
        if(use_vr) {
                // VR mode
                goatvr_draw_start();
                glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

                for(int i=0; i<2; i++) {
                        goatvr_draw_eye(i);

                        glMatrixMode(GL_PROJECTION);
                        glLoadMatrixf(goatvr_projection_matrix(i, 0.5, 1000.0));

                        Mat4 view_mat = goatvr_view_matrix(i);
                        view_mat.pre_rotate_x(deg_to_rad(cam_phi));
                        view_mat.pre_rotate_y(deg_to_rad(cam_theta));
                        view_mat.pre_translate(0, -cam_height, 0);

                        glMatrixMode(GL_MODELVIEW);
                        glLoadMatrixf(view_mat[0]);

                        draw_backdrop();
                }
                goatvr_draw_done();

                if(should_swap) {
                        app_swap_buffers();
                }
                app_redraw();   // in VR mode, force continuous redraw

        } else {
                // regular monoscopic mode
                glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

                Mat4 view_mat;
                view_mat.pre_rotate_x(deg_to_rad(cam_phi));
                view_mat.pre_rotate_y(deg_to_rad(cam_theta));
                view_mat.pre_translate(0, -cam_height, 0);

                glMatrixMode(GL_MODELVIEW);
                glLoadMatrixf(view_mat[0]);

                draw_backdrop();

                app_swap_buffers();
        }
        assert(glGetError() == GL_NO_ERROR);
}

void app_reshape(int x, int y)
{
        glViewport(0, 0, x, y);

        Mat4 mat;
        mat.perspective(deg_to_rad(50), win_aspect, 0.5, 500.0);

        glMatrixMode(GL_PROJECTION);
        glLoadMatrixf(mat[0]);
}

void app_keyboard(int key, bool pressed)
{
        if(pressed) {
                switch(key) {
                case 27:
                        app_quit();
                        break;

                case ' ':
                        if(use_vr) {
                                goatvr_recenter();
                        }
                        break;
                }
        }
}

void app_mouse_button(int bn, bool pressed, int x, int y)
{
        bnstate[bn] = pressed;
        prev_x = x;
        prev_y = y;
}

void app_mouse_motion(int x, int y)
{
        int dx = x - prev_x;
        int dy = y - prev_y;
        prev_x = x;
        prev_y = y;

        if(!dx && !dy) return;

        if(bnstate[0]) {
                cam_theta += dx * 0.5;

                if(!use_vr || !goatvr_have_headtracking()) {
                        cam_phi += dy * 0.5;

                        if(cam_phi < -90) cam_phi = -90;
                        if(cam_phi > 90) cam_phi = 90;
                }
        }
        app_redraw();
}

static bool parse_args(int argc, char **argv)
{
        for(int i=1; i<argc; i++) {
                if(argv[i][0] == '-') {
                        if(strcmp(argv[i], "-vr") == 0) {
                                use_vr = true;

                        } else if(strcmp(argv[i], "-novr") == 0) {
                                use_vr = false;

                        } else if(strcmp(argv[i], "-help") == 0) {
                                printf("usage: %s [options]\noptions:\n", argv[0]);
                                printf(" -vr/-novr: enable/disable VR\n");
                                printf(" -help: print usage information and exit\n");
                                exit(0);
                        } else {
                                fprintf(stderr, "invalid option: %s\n", argv[i]);
                                return false;
                        }
                } else {
                        fprintf(stderr, "unexpected option: %s\n", argv[i]);
                        return false;
                }
        }
        return true;
}