nuclear@0: #include <stdio.h>
nuclear@0: #include <stdlib.h>
nuclear@2: #include <assert.h>
nuclear@0: #include <SDL2/SDL.h>
nuclear@0: #include <GL/glew.h>
nuclear@0: 
nuclear@2: #ifdef WIN32
nuclear@2: #define OVR_OS_WIN32
nuclear@2: #endif
nuclear@2: #ifdef __APPLE__
nuclear@2: #define OVR_OS_MAC
nuclear@2: #endif
nuclear@2: 
nuclear@0: #include <OVR_CAPI.h>
nuclear@0: #include <OVR_CAPI_GL.h>
nuclear@0: 
nuclear@2: int init(void);
nuclear@2: void cleanup(void);
nuclear@2: void display(void);
nuclear@2: void draw_scene(void);
nuclear@2: void draw_box(float xsz, float ysz, float zsz, float norm_sign);
nuclear@0: void update_rtarg(int width, int height);
nuclear@0: int handle_event(SDL_Event *ev);
nuclear@0: int key_event(int key, int state);
nuclear@0: void reshape(int x, int y);
nuclear@0: unsigned int next_pow2(unsigned int x);
nuclear@0: 
nuclear@0: OVR_EXPORT void ovrhmd_EnableHSWDisplaySDKRender(ovrHmd hmd, ovrBool enable);
nuclear@0: 
nuclear@0: static SDL_Window *win;
nuclear@0: static SDL_GLContext ctx;
nuclear@2: static int win_width, win_height;
nuclear@0: 
nuclear@0: static unsigned int fbo, fb_tex, fb_depth;
nuclear@0: static int fb_width, fb_height;
nuclear@0: static int fb_tex_width, fb_tex_height;
nuclear@0: 
nuclear@0: static ovrHmd hmd;
nuclear@0: static ovrSizei eyeres[2];
nuclear@2: static ovrEyeRenderDesc eye_rdesc[2];
nuclear@2: static ovrGLTexture fb_ovr_tex[2];
nuclear@0: 
nuclear@0: 
nuclear@0: int main(void)
nuclear@0: {
nuclear@0: 	if(init() == -1) {
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	for(;;) {
nuclear@0: 		SDL_Event ev;
nuclear@0: 
nuclear@0: 		while(SDL_PollEvent(&ev)) {
nuclear@0: 			if(handle_event(&ev) == -1) {
nuclear@0: 				goto done;
nuclear@0: 			}
nuclear@0: 		}
nuclear@0: 
nuclear@0: 		display();
nuclear@0: 	}
nuclear@0: 
nuclear@0: done:
nuclear@0: 	cleanup();
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@2: int init(void)
nuclear@0: {
nuclear@2: 	int i, x, y;
nuclear@0: 	unsigned int flags, dcaps;
nuclear@0: 	union ovrGLConfig glcfg;
nuclear@0: 
nuclear@0: 	// this must be called before any OpenGL init according to the docs
nuclear@0: 	ovr_Initialize();
nuclear@0: 
nuclear@0: 	SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER);
nuclear@0: 
nuclear@0: 	x = y = SDL_WINDOWPOS_UNDEFINED;
nuclear@2: 	flags = SDL_WINDOW_OPENGL;
nuclear@0: 	if(!(win = SDL_CreateWindow("simple oculus example", x, y, 1280, 800, flags))) {
nuclear@0: 		fprintf(stderr, "failed to create window\n");
nuclear@0: 		return -1;
nuclear@0: 	}
nuclear@0: 	if(!(ctx = SDL_GL_CreateContext(win))) {
nuclear@0: 		fprintf(stderr, "failed to create OpenGL context\n");
nuclear@0: 		return -1;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	glewInit();
nuclear@0: 
nuclear@0: 	if(!(hmd = ovrHmd_Create(0))) {
nuclear@0: 		fprintf(stderr, "failed to open Oculus HMD, falling back to virtual debug HMD\n");
nuclear@2: 		if(!(hmd = ovrHmd_CreateDebug(ovrHmd_DK2))) {
nuclear@0: 			fprintf(stderr, "failed to create virtual debug HMD\n");
nuclear@0: 			return -1;
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 	printf("initialized HMD: %s - %s\n", hmd->Manufacturer, hmd->ProductName);
nuclear@0: 
nuclear@2: 	SDL_SetWindowSize(win, hmd->Resolution.w, hmd->Resolution.h);
nuclear@0: 
nuclear@0: 	ovrHmd_ConfigureTracking(hmd, 0xffffffff, 0);
nuclear@0: 	eyeres[0] = ovrHmd_GetFovTextureSize(hmd, ovrEye_Left, hmd->DefaultEyeFov[0], 1.0);
nuclear@0: 	eyeres[1] = ovrHmd_GetFovTextureSize(hmd, ovrEye_Right, hmd->DefaultEyeFov[1], 1.0);
nuclear@0: 
nuclear@2: 	SDL_GetWindowSize(win, &win_width, &win_height);
nuclear@2: 
nuclear@2: 	fb_width = eyeres[0].w + eyeres[1].w;
nuclear@0: 	fb_height = eyeres[0].h > eyeres[1].h ? eyeres[0].h : eyeres[1].h;
nuclear@0: 	update_rtarg(fb_width, fb_height);
nuclear@0: 
nuclear@2: 	for(i=0; i<2; i++) {
nuclear@2: 		fb_ovr_tex[i].OGL.Header.API = ovrRenderAPI_OpenGL;
nuclear@2: 		fb_ovr_tex[i].OGL.Header.TextureSize.w = fb_tex_width;
nuclear@2: 		fb_ovr_tex[i].OGL.Header.TextureSize.h = fb_tex_height;
nuclear@3: 		fb_ovr_tex[i].OGL.Header.RenderViewport.Pos.x = i == 0 ? 0 : fb_width / 2.0;
nuclear@3: 		fb_ovr_tex[i].OGL.Header.RenderViewport.Pos.y = fb_tex_height - fb_height;
nuclear@2: 		fb_ovr_tex[i].OGL.Header.RenderViewport.Size.w = fb_width / 2.0;
nuclear@2: 		fb_ovr_tex[i].OGL.Header.RenderViewport.Size.h = fb_height;
nuclear@2: 		fb_ovr_tex[i].OGL.TexId = fb_tex;
nuclear@2: 	}
nuclear@2: 
nuclear@0: 	memset(&glcfg, 0, sizeof glcfg);
nuclear@0: 	glcfg.OGL.Header.API = ovrRenderAPI_OpenGL;
nuclear@0: 	glcfg.OGL.Header.RTSize = hmd->Resolution;
nuclear@0: 	glcfg.OGL.Header.Multisample = 1;
nuclear@0: 
nuclear@0: 	if(hmd->HmdCaps & ovrHmdCap_ExtendDesktop) {
nuclear@0: 		printf("running in \"extended desktop\" mode\n");
nuclear@0: 	} else {
nuclear@2: #ifdef WIN32
nuclear@2: 		void *sys_win = GetActiveWindow();
nuclear@2: 		glcfg.OGL.Window = sys_win;
nuclear@2: 		glcfg.OGL.DC = wglGetCurrentDC();
nuclear@2: 		ovrHmd_AttachToWindow(hmd, sys_win, 0, 0);
nuclear@2: #endif
nuclear@0: 		printf("running in \"direct-hmd\" mode\n");
nuclear@0: 	}
nuclear@2: 	ovrHmd_SetEnabledCaps(hmd, ovrHmdCap_LowPersistence | ovrHmdCap_DynamicPrediction);
nuclear@0: 
nuclear@3: 	dcaps = ovrDistortionCap_Chromatic | ovrDistortionCap_Vignette;// | ovrDistortionCap_TimeWarp;
nuclear@0: 	if(!ovrHmd_ConfigureRendering(hmd, &glcfg.Config, dcaps, hmd->DefaultEyeFov, eye_rdesc)) {
nuclear@0: 		fprintf(stderr, "failed to configure distortion renderer\n");
nuclear@0: 	}
nuclear@0: 
nuclear@3: 	ovrhmd_EnableHSWDisplaySDKRender(hmd, 0);
nuclear@0: 
nuclear@0: 	glEnable(GL_DEPTH_TEST);
nuclear@0: 	glEnable(GL_CULL_FACE);
nuclear@0: 	glEnable(GL_LIGHTING);
nuclear@0: 	glEnable(GL_LIGHT0);
nuclear@0: 
nuclear@3: 	glClearColor(0.05, 0.05, 0.05, 1);
nuclear@0: 
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@2: void cleanup(void)
nuclear@0: {
nuclear@0: 	if(hmd) {
nuclear@0: 		ovrHmd_Destroy(hmd);
nuclear@0: 	}
nuclear@0: 	ovr_Shutdown();
nuclear@0: 
nuclear@0: 	SDL_Quit();
nuclear@0: }
nuclear@0: 
nuclear@2: void display(void)
nuclear@0: {
nuclear@2: 	int i;
nuclear@2: 	ovrMatrix4f proj;
nuclear@2: 	ovrPosef pose[2];
nuclear@2: 
nuclear@2: 	ovrHmd_BeginFrame(hmd, 0);
nuclear@2: 
nuclear@2: 	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
nuclear@0: 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@0: 
nuclear@3: 	glViewport(0, 0, fb_width, fb_height);
nuclear@3: 
nuclear@3: 	/*glMatrixMode(GL_PROJECTION);
nuclear@3: 	glLoadIdentity();
nuclear@3: 	glMatrixMode(GL_MODELVIEW);
nuclear@3: 	glLoadIdentity();
nuclear@3: 
nuclear@3: 	glPushAttrib(GL_ENABLE_BIT);
nuclear@3: 	glDisable(GL_LIGHTING);
nuclear@3: 	glDisable(GL_DEPTH_TEST);
nuclear@3: 
nuclear@3: 	glBegin(GL_QUADS);
nuclear@3: 	glColor3f(1, 0, 0);
nuclear@3: 	glVertex2f(-1, -1);
nuclear@3: 	glVertex2f(0, -1);
nuclear@3: 	glVertex2f(0, 1);
nuclear@3: 	glVertex2f(-1, 1);
nuclear@3: 
nuclear@3: 	glColor3f(1, 0, 1);
nuclear@3: 	glVertex2f(-0.6, -0.1);
nuclear@3: 	glVertex2f(-0.4, -0.1);
nuclear@3: 	glVertex2f(-0.4, 0.1);
nuclear@3: 	glVertex2f(-0.6, 0.1);
nuclear@3: 
nuclear@3: 	glColor3f(0, 1, 0);
nuclear@3: 	glVertex2f(0, -1);
nuclear@3: 	glVertex2f(1, -1);
nuclear@3: 	glVertex2f(1, 1);
nuclear@3: 	glVertex2f(0, 1);
nuclear@3: 
nuclear@3: 	glColor3f(0, 1, 1);
nuclear@3: 	glVertex2f(0.4, -0.1);
nuclear@3: 	glVertex2f(0.6, -0.1);
nuclear@3: 	glVertex2f(0.6, 0.1);
nuclear@3: 	glVertex2f(0.4, 0.1);
nuclear@3: 	glEnd();
nuclear@3: 
nuclear@3: 	glPopAttrib();*/
nuclear@3: 
nuclear@2: 	/* for each eye ... */
nuclear@2: 	for(i=0; i<2; i++) {
nuclear@2: 		int eye = hmd->EyeRenderOrder[i];
nuclear@2: 
nuclear@2: 		/* vport0(0, 0, width/2, height), vport1(width/2, 0, width/2, height) */
nuclear@2: 		glViewport(eye == 0 ? 0 : fb_width / 2, 0, fb_width / 2, fb_height);
nuclear@2: 
nuclear@2: 		proj = ovrMatrix4f_Projection(hmd->DefaultEyeFov[eye], 0.5, 500.0, 1);
nuclear@2: 		glMatrixMode(GL_PROJECTION);
nuclear@3: 		//glLoadMatrixf(proj.M[0]);
nuclear@3: 		glLoadIdentity();
nuclear@3: 		gluPerspective(50.0, (float)fb_width / 2.0 / (float)fb_height, 0.5, 500.0);
nuclear@2: 
nuclear@2: 		pose[eye] = ovrHmd_GetEyePose(hmd, eye);
nuclear@2: 		glMatrixMode(GL_MODELVIEW);
nuclear@3: 		/* TODO: get HMD orientation data and use it */
nuclear@3: 		//glTranslatef(0, -ovrHmd_GetFloat(hmd, OVR_KEY_EYE_HEIGHT, 1.65), 0);
nuclear@2: 
nuclear@2: 		draw_scene();
nuclear@2: 	}
nuclear@2: 
nuclear@2: 	glBindFramebuffer(GL_FRAMEBUFFER, 0);
nuclear@2: 	glViewport(0, 0, win_width, win_height);
nuclear@2: 
nuclear@2: 	ovrHmd_EndFrame(hmd, pose, &fb_ovr_tex[0].Texture);
nuclear@2: 
nuclear@2: 	assert(glGetError() == GL_NO_ERROR);
nuclear@2: }
nuclear@2: 
nuclear@2: void draw_scene(void)
nuclear@2: {
nuclear@2: 	int i;
nuclear@2: 	float lpos[] = {0, 5, 0, 1};
nuclear@2: 	glLightfv(GL_LIGHT0, GL_POSITION, lpos);
nuclear@2: 
nuclear@3: 	glPushMatrix();
nuclear@3: 	glTranslatef(0, 0, -8);
nuclear@3: 	draw_box(2, 2, 2, 1.0);
nuclear@3: 	glPopMatrix();
nuclear@3: 
nuclear@2: 	glTranslatef(0, 5, 0);
nuclear@2: 	draw_box(20, 10, 20, -1.0);
nuclear@2: 
nuclear@2: 	for(i=0; i<4; i++) {
nuclear@2: 		glPushMatrix();
nuclear@2: 		if(i & 1) {
nuclear@2: 			glTranslatef(0, 0, i & 2 ? 7.5 : -7.5);
nuclear@2: 		} else {
nuclear@2: 			glTranslatef(i & 2 ? 7.5 : -7.5, 0, 0);
nuclear@2: 		}
nuclear@2: 		draw_box(3, 0, 3, 1.0);
nuclear@2: 		glPopMatrix();
nuclear@2: 	}
nuclear@2: }
nuclear@2: 
nuclear@2: void draw_box(float xsz, float ysz, float zsz, float norm_sign)
nuclear@2: {
nuclear@2: 	glMatrixMode(GL_MODELVIEW);
nuclear@2: 	glScalef(xsz * 0.5, ysz * 0.5, zsz * 0.5);
nuclear@2: 
nuclear@2: 	if(norm_sign < 0.0) {
nuclear@2: 		glFrontFace(GL_CW);
nuclear@2: 	}
nuclear@2: 
nuclear@2: 	glBegin(GL_QUADS);
nuclear@2: 	glNormal3f(0, 0, 1 * norm_sign);
nuclear@2: 	glTexCoord2f(0, 0); glVertex3f(-1, -1, 1);
nuclear@2: 	glTexCoord2f(1, 0); glVertex3f(1, -1, 1);
nuclear@2: 	glTexCoord2f(1, 1); glVertex3f(1, 1, 1);
nuclear@2: 	glTexCoord2f(0, 1); glVertex3f(-1, 1, 1);
nuclear@2: 	glNormal3f(1 * norm_sign, 0, 0);
nuclear@2: 	glTexCoord2f(0, 0); glVertex3f(1, -1, 1);
nuclear@2: 	glTexCoord2f(1, 0); glVertex3f(1, -1, -1);
nuclear@2: 	glTexCoord2f(1, 1); glVertex3f(1, 1, -1);
nuclear@2: 	glTexCoord2f(0, 1); glVertex3f(1, 1, 1);
nuclear@2: 	glNormal3f(0, 0, -1 * norm_sign);
nuclear@2: 	glTexCoord2f(0, 0); glVertex3f(1, -1, -1);
nuclear@2: 	glTexCoord2f(1, 0); glVertex3f(-1, -1, -1);
nuclear@2: 	glTexCoord2f(1, 1); glVertex3f(-1, 1, -1);
nuclear@2: 	glTexCoord2f(0, 1); glVertex3f(1, 1, -1);
nuclear@2: 	glNormal3f(-1 * norm_sign, 0, 0);
nuclear@2: 	glTexCoord2f(0, 0); glVertex3f(-1, -1, -1);
nuclear@2: 	glTexCoord2f(1, 0); glVertex3f(-1, -1, 1);
nuclear@2: 	glTexCoord2f(1, 1); glVertex3f(-1, 1, 1);
nuclear@2: 	glTexCoord2f(0, 1); glVertex3f(-1, 1, -1);
nuclear@2: 	glNormal3f(0, 1 * norm_sign, 0);
nuclear@2: 	glTexCoord2f(0, 0); glVertex3f(-1, 1, 1);
nuclear@2: 	glTexCoord2f(1, 0); glVertex3f(1, 1, 1);
nuclear@2: 	glTexCoord2f(1, 1); glVertex3f(1, 1, -1);
nuclear@2: 	glTexCoord2f(0, 1); glVertex3f(-1, 1, -1);
nuclear@2: 	glNormal3f(0, -1 * norm_sign, 0);
nuclear@2: 	glTexCoord2f(0, 0); glVertex3f(-1, -1, -1);
nuclear@2: 	glTexCoord2f(1, 0); glVertex3f(1, -1, -1);
nuclear@2: 	glTexCoord2f(1, 1); glVertex3f(1, -1, 1);
nuclear@2: 	glTexCoord2f(0, 1); glVertex3f(-1, -1, 1);
nuclear@2: 	glEnd();
nuclear@2: 
nuclear@2: 	glFrontFace(GL_CCW);
nuclear@0: }
nuclear@0: 
nuclear@0: void update_rtarg(int width, int height)
nuclear@0: {
nuclear@0: 	if(!fbo) {
nuclear@0: 		glGenFramebuffers(1, &fbo);
nuclear@0: 		glGenTextures(1, &fb_tex);
nuclear@0: 		glGenRenderbuffers(1, &fb_depth);
nuclear@0: 
nuclear@0: 		glBindTexture(GL_TEXTURE_2D, fb_tex);
nuclear@0: 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@0: 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
nuclear@0: 
nuclear@0: 	fb_tex_width = next_pow2(width);
nuclear@0: 	fb_tex_height = next_pow2(height);
nuclear@0: 
nuclear@0: 	glBindTexture(GL_TEXTURE_2D, fb_tex);
nuclear@0: 	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, fb_tex_width, fb_tex_height, 0,
nuclear@0: 			GL_RGBA, GL_UNSIGNED_BYTE, 0);
nuclear@0: 	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb_tex, 0);
nuclear@0: 
nuclear@0: 	glBindRenderbuffer(GL_RENDERBUFFER, fb_depth);
nuclear@0: 	glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, fb_tex_width, fb_tex_height);
nuclear@0: 	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, fb_depth);
nuclear@0: 
nuclear@0: 	if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
nuclear@0: 		fprintf(stderr, "incomplete framebuffer!\n");
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	glBindFramebuffer(GL_FRAMEBUFFER, 0);
nuclear@0: 	printf("created render target: %dx%d (texture size: %dx%d)\n", width, height, fb_tex_width, fb_tex_height);
nuclear@0: }
nuclear@0: 
nuclear@0: int handle_event(SDL_Event *ev)
nuclear@0: {
nuclear@0: 	switch(ev->type) {
nuclear@0: 	case SDL_KEYDOWN:
nuclear@0: 	case SDL_KEYUP:
nuclear@0: 		if(key_event(ev->key.keysym.sym, ev->key.state == SDL_PRESSED) == -1) {
nuclear@0: 			return -1;
nuclear@0: 		}
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	default:
nuclear@0: 		break;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: int key_event(int key, int state)
nuclear@0: {
nuclear@0: 	if(state) {
nuclear@0: 		switch(key) {
nuclear@0: 		case 27:
nuclear@0: 			return -1;
nuclear@0: 
nuclear@0: 		default:
nuclear@0: 			break;
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 	return 0;
nuclear@0: }
nuclear@2: 
nuclear@2: unsigned int next_pow2(unsigned 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: }