nuclear@0: #include <stdio.h>
nuclear@0: #include <GL/glew.h>
nuclear@0: #include "vr.h"
nuclear@0: #include "vr_impl.h"
nuclear@0: #include "vr_sdr.h"
nuclear@0: 
nuclear@0: #ifndef WIN32
nuclear@0: #include <alloca.h>
nuclear@0: #else
nuclear@0: #include <malloc.h>
nuclear@0: #endif
nuclear@0: 
nuclear@0: static void init_ctx();
nuclear@0: static bool init_ovr();
nuclear@0: static bool init_sdr();
nuclear@0: 
nuclear@0: VRContext vr_ctx;
nuclear@0: static unsigned int sdrprog;
nuclear@0: 
nuclear@0: extern "C" int vr_init(enum vr_init_mode mode)
nuclear@0: {
nuclear@0: 	init_ctx();
nuclear@0: 
nuclear@0: 	if(!init_ovr()) {
nuclear@0: 		return -1;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	if(!init_sdr()) {
nuclear@0: 		return -1;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" void vr_shutdown(void)
nuclear@0: {
nuclear@0: 	delete [] vr_ctx.info.display;
nuclear@0: 	delete vr_ctx.ovr_sfusion;
nuclear@0: 	//System::Destroy();
nuclear@0: 
nuclear@0: 	memset(&vr_ctx, 0, sizeof vr_ctx);
nuclear@0: }
nuclear@0: 
nuclear@0: static void init_ctx()
nuclear@0: {
nuclear@0: 	vr_ctx.info.width = 1280;
nuclear@0: 	vr_ctx.info.height = 800;
nuclear@0: 	vr_ctx.info.fov = M_PI / 2.0;
nuclear@0: 	vr_ctx.info.aspect = (float)vr_ctx.info.width / (float)vr_ctx.info.height;
nuclear@0: 	vr_ctx.info.ipd = 0.035;
nuclear@0: 	vr_ctx.info.scale = 1.0;
nuclear@0: }
nuclear@0: 
nuclear@0: static bool init_ovr()
nuclear@0: {
nuclear@0: 	LogMaskConstants log_level = LogMask_All;
nuclear@0: 	// initialize Oculus SDK
nuclear@0: 	const char *logenv = getenv("VR_LOGLEVEL");
nuclear@0: 	if(logenv) {
nuclear@0: 		switch(atoi(logenv)) {
nuclear@0: 		case 0:
nuclear@0: 			log_level = LogMask_None;
nuclear@0: 			break;
nuclear@0: 		case 1:
nuclear@0: 			log_level = LogMask_Regular;
nuclear@0: 			break;
nuclear@0: 		case 2:
nuclear@0: 		default:
nuclear@0: 			log_level = LogMask_All;
nuclear@0: 			break;
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	System::Init(Log::ConfigureDefaultLog(log_level));
nuclear@0: 	if(!(vr_ctx.ovr_devman = DeviceManager::Create())) {
nuclear@0: 		fprintf(stderr, "failed to create OVR device manager\n");
nuclear@0: 		return false;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	// create the display device
nuclear@0: 	HMDInfo info;
nuclear@0: 	if(!(vr_ctx.ovr_hmd_dev = vr_ctx.ovr_devman->EnumerateDevices<HMDDevice>().CreateDevice())) {
nuclear@0: 		fprintf(stderr, "no oculus rift devices found\n");
nuclear@0: 	} else {
nuclear@0: 		if(vr_ctx.ovr_hmd_dev->GetDeviceInfo(&info)) {
nuclear@0: 			printf("oculus device info:\n");
nuclear@0: 			printf("  name: %s\n", info.DisplayDeviceName);
nuclear@0: 			printf("  ipd: %f\n", info.InterpupillaryDistance);
nuclear@0: 			printf("  distortion: %f %f %f %f\n", info.DistortionK[0],
nuclear@0: 					info.DistortionK[1], info.DistortionK[2], info.DistortionK[3]);
nuclear@0: 		}
nuclear@0: 
nuclear@0: 		// calculate and store viewing parameters
nuclear@0: 		vr_ctx.info.width = info.HResolution;
nuclear@0: 		vr_ctx.info.height = info.VResolution;
nuclear@0: 		vr_ctx.info.aspect = (float)vr_ctx.info.width / (float)vr_ctx.info.height;
nuclear@0: 
nuclear@0: 		vr_ctx.info.ipd = info.InterpupillaryDistance;
nuclear@0: 		for(int i=0; i<4; i++) {
nuclear@0: 			vr_ctx.info.distort[i] = info.DistortionK[i];
nuclear@0: 		}
nuclear@0: 
nuclear@0: 		Util::Render::StereoConfig stereohelp;
nuclear@0: 		stereohelp.SetFullViewport(Util::Render::Viewport(0, 0, vr_ctx.info.width, vr_ctx.info.height));
nuclear@0: 		stereohelp.SetStereoMode(Util::Render::Stereo_LeftRight_Multipass);
nuclear@0: 		stereohelp.SetHMDInfo(info);
nuclear@0: 		stereohelp.SetDistortionFitPointVP(-1.0, 0.0);
nuclear@0: 
nuclear@0: 		vr_ctx.info.scale = stereohelp.GetDistortionScale();
nuclear@0: 
nuclear@0: 		float vhalfsz = vr_ctx.info.scale * info.VScreenSize * 0.5;
nuclear@0: 		vr_ctx.info.fov = 2.0 * atan(vhalfsz / info.EyeToScreenDistance);
nuclear@0: 
nuclear@0: 		vr_ctx.info.lens_center_offset = 0.5 - info.LensSeparationDistance / info.HScreenSize;
nuclear@0: 
nuclear@0: 		// calculate center of projection shift to match the lens positions
nuclear@0: 		float center_dist_meters = info.HScreenSize * 0.25;
nuclear@0: 		float proj_shift = center_dist_meters - info.LensSeparationDistance * 0.5;
nuclear@0: 		vr_ctx.info.proj_center_offset = 4.0 * proj_shift / info.HScreenSize;
nuclear@0: 
nuclear@0: 		// grab the display info
nuclear@0: 		vr_ctx.info.display = new char[strlen(info.DisplayDeviceName) + 1];
nuclear@0: 		strcpy(vr_ctx.info.display, info.DisplayDeviceName);
nuclear@0: 
nuclear@0: 		vr_ctx.info.display_xoffs = info.DesktopX;
nuclear@0: 		vr_ctx.info.display_yoffs = info.DesktopY;
nuclear@0: 
nuclear@0: 		printf("display: \"%s\" offset: %+d %+d\n", vr_ctx.info.display,
nuclear@0: 				vr_ctx.info.display_xoffs, vr_ctx.info.display_yoffs);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	// get the sensor device
nuclear@0: 	if(vr_ctx.ovr_hmd_dev) {
nuclear@0: 		if(!(vr_ctx.ovr_sensor_dev = vr_ctx.ovr_hmd_dev->GetSensor())) {
nuclear@0: 			fprintf(stderr, "failed to get oculus sensor device\n");
nuclear@0: 		}
nuclear@0: 	} else {
nuclear@0: 		if(!(vr_ctx.ovr_sensor_dev = vr_ctx.ovr_devman->EnumerateDevices<SensorDevice>().CreateDevice())) {
nuclear@0: 			fprintf(stderr, "failed to get oculus sensor device\n");
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	if(vr_ctx.ovr_sensor_dev) {
nuclear@0: 		SensorInfo sinfo;
nuclear@0: 		if(vr_ctx.ovr_sensor_dev->GetDeviceInfo(&sinfo)) {
nuclear@0: 			printf("oculus sensor device info:\n");
nuclear@0: 			printf("  name: %s\n", sinfo.ProductName);
nuclear@0: 		}
nuclear@0: 
nuclear@0: 		vr_ctx.ovr_sfusion = new SensorFusion;
nuclear@0: 		vr_ctx.ovr_sfusion->AttachToSensor(vr_ctx.ovr_sensor_dev);
nuclear@0: 	}
nuclear@0: 	return true;
nuclear@0: }
nuclear@0: 
nuclear@0: #undef EXTERNAL_SHADER
nuclear@0: 
nuclear@0: static bool init_sdr()
nuclear@0: {
nuclear@0: 	int status;
nuclear@0: 
nuclear@0: #ifdef EXTERNAL_SHADER
nuclear@0: 	FILE *fp = fopen("sdr/sdr.glsl", "rb");
nuclear@0: 	if(!fp) {
nuclear@0: 		perror("failed to load sdr.glsl");
nuclear@0: 		return false;
nuclear@0: 	}
nuclear@0: 	fseek(fp, 0, SEEK_END);
nuclear@0: 	long sz = ftell(fp);
nuclear@0: 	rewind(fp);
nuclear@0: 
nuclear@0: 	char *buf = (char*)alloca(sz + 1);
nuclear@0: 	fread(buf, 1, sz, fp);
nuclear@0: 	buf[sz] = 0;
nuclear@0: 	sdr_src = buf;
nuclear@0: 
nuclear@0: 	fclose(fp);
nuclear@0: #endif
nuclear@0: 
nuclear@0: 	unsigned int sdr = glCreateShader(GL_FRAGMENT_SHADER);
nuclear@0: 	glShaderSource(sdr, 1, &sdr_src, 0);
nuclear@0: 	glCompileShader(sdr);
nuclear@0: 	glGetShaderiv(sdr, GL_COMPILE_STATUS, &status);
nuclear@0: 	if(!status) {
nuclear@0: 		fprintf(stderr, "failed to compile distortion shader\n");
nuclear@0: 
nuclear@0: 		int loglen;
nuclear@0: 		glGetShaderiv(sdr, GL_INFO_LOG_LENGTH, &loglen);
nuclear@0: 
nuclear@0: 		if(loglen > 0) {
nuclear@0: 			char *log = (char*)alloca(loglen);
nuclear@0: 			glGetShaderInfoLog(sdr, loglen, &loglen, log);
nuclear@0: 			fprintf(stderr, "%s\n", log);
nuclear@0: 		}
nuclear@0: 
nuclear@0: 		return false;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	sdrprog = glCreateProgram();
nuclear@0: 	glAttachShader(sdrprog, sdr);
nuclear@0: 	glLinkProgram(sdrprog);
nuclear@0: 	if(!status) {
nuclear@0: 		fprintf(stderr, "failed to link distortion shader program\n");
nuclear@0: 		glDeleteShader(sdr);
nuclear@0: 		return false;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	int loc;
nuclear@0: 
nuclear@0: 	glUseProgram(sdrprog);
nuclear@0: 
nuclear@0: 	if((loc = glGetUniformLocation(sdrprog, "tex")) != -1) {
nuclear@0: 		glUniform1i(loc, 0);
nuclear@0: 	}
nuclear@0: 	if((loc = glGetUniformLocation(sdrprog, "lens_center_offset")) != -1) {
nuclear@0: 		glUniform1f(loc, 0);
nuclear@0: 	}
nuclear@0: 	if((loc = glGetUniformLocation(sdrprog, "scr_center")) != -1) {
nuclear@0: 		glUniform2f(loc, 0, 0);
nuclear@0: 	}
nuclear@0: 	if((loc = glGetUniformLocation(sdrprog, "scale")) != -1) {
nuclear@0: 		glUniform1f(loc, vr_ctx.info.scale);
nuclear@0: 	}
nuclear@0: 	if((loc = glGetUniformLocation(sdrprog, "aspect")) != -1) {
nuclear@0: 		printf("setting aspect: %f\n", vr_ctx.info.aspect / 2.0);
nuclear@0: 		glUniform1f(loc, vr_ctx.info.aspect / 2.0);
nuclear@0: 	}
nuclear@0: 	if((loc = glGetUniformLocation(sdrprog, "scale_in")) != -1) {
nuclear@0: 		glUniform2f(loc, 1, 1);
nuclear@0: 	}
nuclear@0: 	if((loc = glGetUniformLocation(sdrprog, "dist_factors")) != -1) {
nuclear@0: 		glUniform4f(loc, vr_ctx.info.distort[0], vr_ctx.info.distort[1],
nuclear@0: 				vr_ctx.info.distort[2], vr_ctx.info.distort[3]);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	return true;
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" const char *vr_get_display_name(void)
nuclear@0: {
nuclear@0: 	return vr_ctx.info.display;
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" void vr_get_display_pos(int *xptr, int *yptr)
nuclear@0: {
nuclear@0: 	*xptr = vr_ctx.info.display_xoffs;
nuclear@0: 	*yptr = vr_ctx.info.display_yoffs;
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" int vr_get_width(void)
nuclear@0: {
nuclear@0: 	return vr_ctx.info.width;
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" int vr_get_height(void)
nuclear@0: {
nuclear@0: 	return vr_ctx.info.height;
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" float vr_get_fov(void)
nuclear@0: {
nuclear@0: 	return vr_ctx.info.fov;
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" float vr_get_aspect(void)
nuclear@0: {
nuclear@0: 	return vr_ctx.info.aspect;
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" void vr_set_eyedist(float ipd)
nuclear@0: {
nuclear@0: 	vr_ctx.info.ipd = ipd;
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" float vr_get_eyedist(void)
nuclear@0: {
nuclear@0: 	return vr_ctx.info.ipd;
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" void vr_set_distort(const float *coef)
nuclear@0: {
nuclear@0: 	memcpy(vr_ctx.info.distort, coef, sizeof vr_ctx.info.distort);
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" void vr_get_distort(float *coef)
nuclear@0: {
nuclear@0: 	memcpy(coef, vr_ctx.info.distort, sizeof vr_ctx.info.distort);
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" void vr_set_prediction_sec(float dt)
nuclear@0: {
nuclear@0: 	vr_ctx.ovr_sfusion->SetPrediction(dt);
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" float vr_get_prediction_sec(void)
nuclear@0: {
nuclear@0: 	return vr_ctx.ovr_sfusion->GetPredictionDelta();
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" void vr_get_view_matrix(float *res, int eye)
nuclear@0: {
nuclear@0: 	// TODO
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" void vr_get_proj_matrix(float *res, int eye)
nuclear@0: {
nuclear@0: 	static float eye_scale[] = {0.0, 1.0, -1.0};
nuclear@0: 
nuclear@0: 	Matrix4f proj = Matrix4f::PerspectiveRH(vr_ctx.info.fov, vr_ctx.info.aspect / 2.0, 0.3, 1000.0);
nuclear@0: 	proj = Matrix4f::Translation(vr_ctx.info.proj_center_offset * eye_scale[eye], 0, 0) * proj;
nuclear@0: 
nuclear@0: 	memcpy(res, proj.M[0], 16 * sizeof(float));
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" void vr_get_translation(float *offs)
nuclear@0: {
nuclear@0: 	// current oculus devkit doesn't do translation
nuclear@0: 	offs[0] = offs[1] = offs[2] = 0.0f;
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" void vr_get_rotation(float *quat)
nuclear@0: {
nuclear@0: 	Quatf oq = vr_ctx.ovr_sfusion->GetPredictedOrientation();
nuclear@0: 	quat[0] = oq.x;
nuclear@0: 	quat[1] = oq.y;
nuclear@0: 	quat[2] = oq.z;
nuclear@0: 	quat[3] = oq.w;
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" void vr_get_rotation_euler(float *euler)
nuclear@0: {
nuclear@0: 	Quatf oq = vr_ctx.ovr_sfusion->GetPredictedOrientation();
nuclear@0: 	oq.GetEulerAngles<Axis_Y, Axis_X, Axis_Z>(euler + 1, euler, euler + 2);
nuclear@0: }
nuclear@0: 
nuclear@0: extern "C" void vr_draw_eye(int eye, unsigned int tex, float tex_scale_x, float tex_scale_y)
nuclear@0: {
nuclear@0: 	static const float rects[3][4] = {
nuclear@0: 		{-1, -1, 1, 1},
nuclear@0: 		{-1, -1, 0, 1},
nuclear@0: 		{0, -1, 1, 1}
nuclear@0: 	};
nuclear@0: 	static const float offs_scale[3] = {0.0, -1.0, 1.0};
nuclear@0: 
nuclear@0: 	glPushAttrib(GL_ENABLE_BIT);
nuclear@0: 	glDisable(GL_DEPTH_TEST);
nuclear@0: 	glDisable(GL_LIGHTING);
nuclear@0: 	glEnable(GL_TEXTURE_2D);
nuclear@0: 
nuclear@0: 	glMatrixMode(GL_MODELVIEW);
nuclear@0: 	glPushMatrix();
nuclear@0: 	glLoadIdentity();
nuclear@0: 
nuclear@0: 	glMatrixMode(GL_PROJECTION);
nuclear@0: 	glPushMatrix();
nuclear@0: 	glLoadIdentity();
nuclear@0: 
nuclear@0: 	glUseProgram(sdrprog);
nuclear@0: 
nuclear@0: 	if(sdrprog) {
nuclear@0: 		int loc;
nuclear@0: 		if((loc = glGetUniformLocation(sdrprog, "lens_center_offset")) != -1) {
nuclear@0: 			float offset = vr_ctx.info.lens_center_offset * offs_scale[eye];
nuclear@0: 			glUniform1f(loc, offset);
nuclear@0: 		}
nuclear@0: 
nuclear@0: 		if((loc = glGetUniformLocation(sdrprog, "tex_scale")) != -1) {
nuclear@0: 			glUniform2f(loc, tex_scale_x, tex_scale_y);
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	glBindTexture(GL_TEXTURE_2D, tex);
nuclear@0: 	glBegin(GL_QUADS);
nuclear@0: 	glColor4f(1, 1, 1, 1);
nuclear@0: 	glTexCoord2f(0, 0); glVertex2f(rects[eye][0], rects[eye][1]);
nuclear@0: 	glTexCoord2f(1, 0); glVertex2f(rects[eye][2], rects[eye][1]);
nuclear@0: 	glTexCoord2f(1, 1); glVertex2f(rects[eye][2], rects[eye][3]);
nuclear@0: 	glTexCoord2f(0, 1); glVertex2f(rects[eye][0], rects[eye][3]);
nuclear@0: 	glEnd();
nuclear@0: 
nuclear@0: 	glUseProgram(0);
nuclear@0: 
nuclear@0: 	glPopMatrix();
nuclear@0: 	glMatrixMode(GL_MODELVIEW);
nuclear@0: 	glPopMatrix();
nuclear@0: 
nuclear@0: 	glPopAttrib();
nuclear@0: }