[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"
#include "opt.h"
#include "fs.h"

static void draw_scene();

int win_width, win_height;
float win_aspect;
long time_msec;
double time_sec;
Mat4 view_matrix;

float cam_height = 1.65;

static float cam_theta, cam_phi;
static bool should_swap;

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

static float fov = 60.0;

bool app_init(int argc, char **argv)
{
        if(!init_options(argc, argv, "vrfileman.conf")) {
                return false;
        }
        app_resize(opt.width, opt.height);
        app_fullscreen(opt.fullscreen);

        if(init_opengl() == -1) {
                return false;
        }

        glEnable(GL_MULTISAMPLE);

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

        printf("Max anisotropy: %d\n", glcaps.max_aniso);

        glEnable(GL_CULL_FACE);
        glEnable(GL_DEPTH_TEST);

        if(opt.srgb && GLEW_ARB_framebuffer_sRGB) {
                printf("enabling sRGB framebuffer\n");
                glEnable(GL_FRAMEBUFFER_SRGB);
        }

        if(opt.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;

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

        if(!init_fs(opt.path)) {
                return false;
        }

        return true;
}

void app_cleanup()
{
        if(opt.vr) {
                goatvr_shutdown();
        }
        cleanup_backdrop();
}

void app_draw()
{
        if(opt.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, 0.1, 200.0));

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

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

                        draw_scene();
                }
                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 mat;
                mat.perspective(deg_to_rad(fov), win_aspect, 0.1, 200.0);
                glMatrixMode(GL_PROJECTION);
                glLoadMatrixf(mat[0]);

                view_matrix = Mat4::identity;
                view_matrix.pre_rotate_x(deg_to_rad(cam_phi));
                view_matrix.pre_rotate_y(deg_to_rad(cam_theta));
                view_matrix.pre_translate(0, -cam_height, 0);

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

                draw_scene();

                app_swap_buffers();
                app_redraw();   // since we added animation we need to redisplay even in non-VR mode
        }
        assert(glGetError() == GL_NO_ERROR);
}

static void draw_scene()
{
        draw_backdrop();
        draw_fs();
}

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

        if(opt.vr) {
                goatvr_set_fb_size(x, y, 1.0);
        }
}

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

                case 'f':
                        if(!opt.vr || should_swap) {
                                /* we take the need to swap as a signal that our window is not managed
                                 * by some VR compositor, and therefore it's safe to fullscreen without
                                 * upsetting the VR rendering output
                                 */
                                opt.fullscreen = !opt.fullscreen;
                                app_fullscreen(opt.fullscreen);
                        }
                        break;

                case ' ':
                        if(opt.vr) {
                                goatvr_recenter();
                        }
                        break;

                case '-':
                        fov += 1.0;
                        if(fov > 160.0) fov = 160.0;
                        break;

                case '=':
                        fov -= 1.0;
                        if(fov < 0.0) fov = 0.0;
                        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(!opt.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();
}