nuclear@2: #include <stdio.h>
nuclear@2: #include <assert.h>
nuclear@2: #include <algorithm>
nuclear@2: #include "opengl.h"
nuclear@2: #include "game.h"
nuclear@2: #include "goatvr.h"
nuclear@3: #include "teapot.h"
nuclear@2: 
nuclear@2: static void draw_scene();
nuclear@2: static void toggle_hmd_fullscr();
nuclear@2: static void create_rtarg(int x, int y);
nuclear@2: static int next_pow2(int x);
nuclear@2: 
nuclear@2: static int win_width, win_height;
nuclear@2: static unsigned int fb_tex;
nuclear@2: static unsigned int fbo, fb_depth;
nuclear@2: static int fb_xsz, fb_ysz;
nuclear@2: static int fb_tex_xsz, fb_tex_ysz;
nuclear@2: 
nuclear@2: bool game_init()
nuclear@2: {
nuclear@2: 	init_opengl();
nuclear@2: 
nuclear@2: 	if(vr_init() == -1) {
nuclear@2: 		return false;
nuclear@2: 	}
nuclear@2: 
nuclear@2: 	glEnable(GL_DEPTH_TEST);
nuclear@2: 	glEnable(GL_CULL_FACE);
nuclear@3: 	glEnable(GL_LIGHTING);
nuclear@2: 
nuclear@2: 	return true;
nuclear@2: }
nuclear@2: 
nuclear@2: void game_cleanup()
nuclear@2: {
nuclear@2: 	vr_shutdown();
nuclear@2: }
nuclear@2: 
nuclear@2: void game_update(long tm)
nuclear@2: {
nuclear@2: }
nuclear@2: 
nuclear@2: void game_display()
nuclear@2: {
nuclear@2: 	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
nuclear@2: 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@2: 
nuclear@2: 	for(int i=0; i<2; i++) {
nuclear@2: 		glViewport(i == 0 ? 0 : fb_xsz / 2, 0, fb_xsz / 2, fb_ysz);
nuclear@2: 		vr_begin(i);
nuclear@2: 
nuclear@2: 		float proj[16];
nuclear@2: 		if(vr_proj_matrix(i, 0.5, 500.0, proj)) {
nuclear@2: 			glMatrixMode(GL_PROJECTION);
nuclear@2: 			glLoadMatrixf(proj);
nuclear@2: 		}
nuclear@2: 
nuclear@2: 		glMatrixMode(GL_MODELVIEW);
nuclear@2: 
nuclear@2: 		float view[16];
nuclear@2: 		vr_view_matrix(i, view);
nuclear@2: 		glLoadMatrixf(view);
nuclear@2: 		/* move the camera to the eye level of the user */
nuclear@2: 		glTranslatef(0, -vr_getf_def(VR_EYE_HEIGHT, 1.65), 0);
nuclear@2: 
nuclear@2: 		draw_scene();
nuclear@2: 
nuclear@2: 		vr_end();
nuclear@2: 	}
nuclear@2: 
nuclear@2: 	glBindFramebuffer(GL_FRAMEBUFFER, 0);
nuclear@2: 	glViewport(0, 0, win_width, win_height);
nuclear@2: 
nuclear@2: 	vr_swap_buffers();
nuclear@2: 	assert(glGetError() == GL_NO_ERROR);
nuclear@2: }
nuclear@2: 
nuclear@2: void game_reshape(int x, int y)
nuclear@2: {
nuclear@2: 	win_width = x;
nuclear@2: 	win_height = y;
nuclear@2: 
nuclear@2: 	create_rtarg(vr_geti_def(VR_RENDER_XRES, x), vr_geti_def(VR_RENDER_YRES, y));
nuclear@2: 	vr_output_texture(fb_tex, 0, 0, (float)fb_xsz / (float)fb_tex_xsz, (float)fb_ysz / (float)fb_tex_ysz);
nuclear@2: 
nuclear@2: 	/* these might be overriden in VR mode (see game_display) */
nuclear@2: 	glViewport(0, 0, x, y);
nuclear@2: 	glMatrixMode(GL_PROJECTION);
nuclear@2: 	glLoadIdentity();
nuclear@2: 	gluPerspective(50.0, (float)x / (float)y, 0.5, 500.0);
nuclear@2: }
nuclear@2: 
nuclear@2: void game_keyboard(int key, bool pressed)
nuclear@2: {
nuclear@2: 	if(pressed) {
nuclear@2: 		switch(key) {
nuclear@2: 		case 27:
nuclear@2: 			exit_game();
nuclear@2: 			break;
nuclear@2: 
nuclear@2: 		case 'f':
nuclear@2: 			toggle_hmd_fullscr();
nuclear@2: 			break;
nuclear@2: 
nuclear@2: 		case 'r':
nuclear@2: 			vr_recenter();
nuclear@2: 			break;
nuclear@2: 
nuclear@2: 		default:
nuclear@2: 			break;
nuclear@2: 		}
nuclear@2: 	}
nuclear@2: }
nuclear@2: 
nuclear@2: void game_mouse_button(int bn, bool state, int x, int y)
nuclear@2: {
nuclear@2: }
nuclear@2: 
nuclear@2: void game_mouse_motion(int x, int y)
nuclear@2: {
nuclear@2: }
nuclear@2: 
nuclear@3: static void material(float r, float g, float b, float roughness)
nuclear@3: {
nuclear@3: 	float gloss = 1.0 - roughness;
nuclear@3: 	float diffuse[] = {r * roughness, g * roughness, b * roughness, 1.0};
nuclear@3: 	float specular[] = {gloss, gloss, gloss, 1.0};
nuclear@3: 	float shin = gloss * 128.0;
nuclear@3: 
nuclear@3: 	glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, diffuse);
nuclear@3: 	glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, specular);
nuclear@3: 	glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, shin);
nuclear@3: }
nuclear@3: 
nuclear@2: static void draw_scene()
nuclear@2: {
nuclear@3: 	float lpos[][4] = {
nuclear@3: 		{-0.7, 0.7, 1, 0},
nuclear@3: 		{1, 0, 1, 0}
nuclear@3: 	};
nuclear@3: 	float lcol[][4] = {
nuclear@3: 		{0.9, 0.7, 0.6, 1},
nuclear@3: 		{0.3, 0.4, 0.75, 1}
nuclear@3: 	};
nuclear@3: 	for(int i=0; i<2; i++) {
nuclear@3: 		glEnable(GL_LIGHT0 + i);
nuclear@3: 		glLightfv(GL_LIGHT0 + i, GL_POSITION, lpos[i]);
nuclear@3: 		glLightfv(GL_LIGHT0 + i, GL_DIFFUSE, lcol[i]);
nuclear@3: 		glLightfv(GL_LIGHT0 + i, GL_SPECULAR, lcol[i]);
nuclear@3: 	}
nuclear@3: 
nuclear@3: 	glMatrixMode(GL_MODELVIEW);
nuclear@3: 
nuclear@3: 	material(1, 1, 1, 1);
nuclear@3: 	glBegin(GL_QUADS);
nuclear@3: 	glNormal3f(0, 1, 0);
nuclear@3: 	glVertex3f(-10, 0, 10);
nuclear@3: 	glVertex3f(10, 0, 10);
nuclear@3: 	glVertex3f(10, 0, -10);
nuclear@3: 	glVertex3f(-10, 0, -10);
nuclear@3: 	glEnd();
nuclear@3: 
nuclear@3: 	material(1, 1, 1, 0.4);
nuclear@3: 	glPushMatrix();
nuclear@3: 	glTranslatef(0, 1.3, -10);
nuclear@3: 	glFrontFace(GL_CW);
nuclear@3: 	bezier_teapot(2.0);
nuclear@3: 	glFrontFace(GL_CCW);
nuclear@3: 	glPopMatrix();
nuclear@2: }
nuclear@2: 
nuclear@2: static void toggle_hmd_fullscr()
nuclear@2: {
nuclear@2: 	static bool fullscr;
nuclear@2: 	static int prev_x, prev_y;
nuclear@2: 	//static int prev_xsz, prev_ysz;
nuclear@2: 
nuclear@2: 	fullscr = !fullscr;
nuclear@2: 	if(fullscr) {
nuclear@2: 		/* entering fullscreen on the HMD */
nuclear@2: 		int xoffs = vr_geti_def(VR_WIN_XOFFS, -1);
nuclear@2: 		int yoffs = vr_geti_def(VR_WIN_YOFFS, -1);
nuclear@2: 		if(xoffs != -1) {
nuclear@2: 			get_window_pos(&prev_x, &prev_y);
nuclear@2: 			move_window(xoffs, yoffs);
nuclear@2: 		}
nuclear@2: 
nuclear@2: 		int xsz = vr_geti_def(VR_DISPLAY_WIDTH, -1);
nuclear@2: 		int ysz = vr_geti_def(VR_DISPLAY_HEIGHT, -1);
nuclear@2: 		if(xsz != -1) {
nuclear@2: 			//prev_xsz = win_width;
nuclear@2: 			//prev_ysz = win_height;
nuclear@2: 			resize_window(xsz, ysz);
nuclear@2: 		}
nuclear@2: 		enter_fullscreen();
nuclear@2: 
nuclear@2: 	} else {
nuclear@2: 		/* leaving fullscreen */
nuclear@2: 		leave_fullscreen();
nuclear@2: 		/*move_window(prev_x, prev_y);
nuclear@2: 		resize_window(prev_xsz, prev_ysz);*/
nuclear@2: 	}
nuclear@2: }
nuclear@2: 
nuclear@2: static void create_rtarg(int x, int y)
nuclear@2: {
nuclear@2: 	if(x == fb_xsz && y == fb_ysz) {
nuclear@2: 		return;	// nothing changed
nuclear@2: 	}
nuclear@2: 
nuclear@2: 	fb_xsz = x;
nuclear@2: 	fb_ysz = y;
nuclear@2: 	fb_tex_xsz = next_pow2(fb_xsz);
nuclear@2: 	fb_tex_ysz = next_pow2(fb_ysz);
nuclear@2: 
nuclear@2: 	if(!fbo) {
nuclear@2: 		glGenFramebuffers(1, &fbo);
nuclear@2: 
nuclear@2: 		glGenTextures(1, &fb_tex);
nuclear@2: 		glBindTexture(GL_TEXTURE_2D, fb_tex);
nuclear@2: 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@2: 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@2: 
nuclear@2: 		glGenRenderbuffers(1, &fb_depth);
nuclear@2: 	}
nuclear@2: 
nuclear@2: 	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
nuclear@2: 
nuclear@2: 	glBindTexture(GL_TEXTURE_2D, fb_tex);
nuclear@2: 	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, fb_tex_xsz, fb_tex_ysz, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
nuclear@2: 	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb_tex, 0);
nuclear@2: 
nuclear@2: 	glBindRenderbuffer(GL_RENDERBUFFER, fb_depth);
nuclear@2: 	glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, fb_tex_xsz, fb_tex_ysz);
nuclear@2: 	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, fb_depth);
nuclear@2: 
nuclear@2: 	assert(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);
nuclear@2: 	glBindFramebuffer(GL_FRAMEBUFFER, 0);
nuclear@2: }
nuclear@2: 
nuclear@2: static int next_pow2(int x)
nuclear@2: {
nuclear@2: 	x -= 1;
nuclear@2: 	x |= x >> 1;
nuclear@2: 	x |= x >> 2;
nuclear@2: 	x |= x >> 4;
nuclear@2: 	x |= x >> 8;
nuclear@2: 	x |= x >> 16;
nuclear@2: 	return x + 1;
nuclear@2: }