1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/main.c	Tue Aug 26 02:55:17 2014 +0300
     1.3 @@ -0,0 +1,212 @@
     1.4 +#include <stdio.h>
     1.5 +#include <stdlib.h>
     1.6 +#include <SDL2/SDL.h>
     1.7 +#include <GL/glew.h>
     1.8 +
     1.9 +#include <OVR_CAPI.h>
    1.10 +#include <OVR_CAPI_GL.h>
    1.11 +
    1.12 +int init();
    1.13 +void cleanup();
    1.14 +void display();
    1.15 +void update_rtarg(int width, int height);
    1.16 +int handle_event(SDL_Event *ev);
    1.17 +int key_event(int key, int state);
    1.18 +void reshape(int x, int y);
    1.19 +unsigned int next_pow2(unsigned int x);
    1.20 +
    1.21 +OVR_EXPORT void ovrhmd_EnableHSWDisplaySDKRender(ovrHmd hmd, ovrBool enable);
    1.22 +
    1.23 +static SDL_Window *win;
    1.24 +static SDL_GLContext ctx;
    1.25 +
    1.26 +static unsigned int fbo, fb_tex, fb_depth;
    1.27 +static int fb_width, fb_height;
    1.28 +static int fb_tex_width, fb_tex_height;
    1.29 +
    1.30 +static ovrHmd hmd;
    1.31 +static ovrSizei eyeres[2];
    1.32 +
    1.33 +
    1.34 +int main(void)
    1.35 +{
    1.36 +	if(init() == -1) {
    1.37 +		return 1;
    1.38 +	}
    1.39 +
    1.40 +	for(;;) {
    1.41 +		SDL_Event ev;
    1.42 +
    1.43 +		while(SDL_PollEvent(&ev)) {
    1.44 +			if(handle_event(&ev) == -1) {
    1.45 +				goto done;
    1.46 +			}
    1.47 +		}
    1.48 +
    1.49 +		display();
    1.50 +	}
    1.51 +
    1.52 +done:
    1.53 +	cleanup();
    1.54 +	return 0;
    1.55 +}
    1.56 +
    1.57 +
    1.58 +int init()
    1.59 +{
    1.60 +	int x, y;
    1.61 +	unsigned int flags, dcaps;
    1.62 +	union ovrGLConfig glcfg;
    1.63 +	ovrEyeRenderDesc eye_rdesc[2];
    1.64 +
    1.65 +	// this must be called before any OpenGL init according to the docs
    1.66 +	ovr_Initialize();
    1.67 +
    1.68 +	SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER);
    1.69 +
    1.70 +	x = y = SDL_WINDOWPOS_UNDEFINED;
    1.71 +	flags = SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE;
    1.72 +	if(!(win = SDL_CreateWindow("simple oculus example", x, y, 1280, 800, flags))) {
    1.73 +		fprintf(stderr, "failed to create window\n");
    1.74 +		return -1;
    1.75 +	}
    1.76 +	if(!(ctx = SDL_GL_CreateContext(win))) {
    1.77 +		fprintf(stderr, "failed to create OpenGL context\n");
    1.78 +		return -1;
    1.79 +	}
    1.80 +
    1.81 +	glewInit();
    1.82 +
    1.83 +	if(!(hmd = ovrHmd_Create(0))) {
    1.84 +		fprintf(stderr, "failed to open Oculus HMD, falling back to virtual debug HMD\n");
    1.85 +		if(!(hmd = ovrHmd_CreateDebug())) {
    1.86 +			fprintf(stderr, "failed to create virtual debug HMD\n");
    1.87 +			return -1;
    1.88 +		}
    1.89 +	}
    1.90 +	printf("initialized HMD: %s - %s\n", hmd->Manufacturer, hmd->ProductName);
    1.91 +
    1.92 +	SDL_SetWindowSize(hmd->Resolution.w, hmd->Resolution.h);
    1.93 +
    1.94 +	ovrHmd_ConfigureTracking(hmd, 0xffffffff, 0);
    1.95 +	eyeres[0] = ovrHmd_GetFovTextureSize(hmd, ovrEye_Left, hmd->DefaultEyeFov[0], 1.0);
    1.96 +	eyeres[1] = ovrHmd_GetFovTextureSize(hmd, ovrEye_Right, hmd->DefaultEyeFov[1], 1.0);
    1.97 +
    1.98 +	fb_width = eyeres[0].w + eyres[1].w;
    1.99 +	fb_height = eyeres[0].h > eyeres[1].h ? eyeres[0].h : eyeres[1].h;
   1.100 +	update_rtarg(fb_width, fb_height);
   1.101 +
   1.102 +	memset(&glcfg, 0, sizeof glcfg);
   1.103 +	glcfg.OGL.Header.API = ovrRenderAPI_OpenGL;
   1.104 +	glcfg.OGL.Header.RTSize = hmd->Resolution;
   1.105 +	glcfg.OGL.Header.Multisample = 1;
   1.106 +
   1.107 +	if(hmd->HmdCaps & ovrHmdCap_ExtendDesktop) {
   1.108 +		printf("running in \"extended desktop\" mode\n");
   1.109 +	} else {
   1.110 +		printf("running in \"direct-hmd\" mode\n");
   1.111 +#ifdef WIN32
   1.112 +		ovrHmd_AttachToWindow(hmd, GetActiveWindow(), 0, 0);
   1.113 +#endif
   1.114 +	}
   1.115 +	ovrHmd_SetEnabledCaps(hmd, ovrHmdCap_LowPersistence | ovrHmdCaps_DynamicPrediction);
   1.116 +
   1.117 +	dcaps = ovrDistortionCap_Chromatic | ovrDistortionCap_Vignette | ovrDistortionCap_TimeWrap;
   1.118 +	if(!ovrHmd_ConfigureRendering(hmd, &glcfg.Config, dcaps, hmd->DefaultEyeFov, eye_rdesc)) {
   1.119 +		fprintf(stderr, "failed to configure distortion renderer\n");
   1.120 +	}
   1.121 +
   1.122 +	ovrhmd_EnableHSWDisplaySDKRender(hmd, 0);
   1.123 +
   1.124 +
   1.125 +	glEnable(GL_DEPTH_TEST);
   1.126 +	glEnable(GL_CULL_FACE);
   1.127 +	glEnable(GL_LIGHTING);
   1.128 +	glEnable(GL_LIGHT0);
   1.129 +
   1.130 +	glClearColor(0.05, 0.05, 0.05, 1);
   1.131 +
   1.132 +	return 0;
   1.133 +}
   1.134 +
   1.135 +void cleanup()
   1.136 +{
   1.137 +	if(hmd) {
   1.138 +		ovrHmd_Destroy(hmd);
   1.139 +	}
   1.140 +	ovr_Shutdown();
   1.141 +
   1.142 +	SDL_Quit();
   1.143 +}
   1.144 +
   1.145 +void display()
   1.146 +{
   1.147 +	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
   1.148 +
   1.149 +	SDL_GL_SwapWindow(win);
   1.150 +}
   1.151 +
   1.152 +void update_rtarg(int width, int height)
   1.153 +{
   1.154 +	if(!fbo) {
   1.155 +		glGenFramebuffers(1, &fbo);
   1.156 +		glGenTextures(1, &fb_tex);
   1.157 +		glGenRenderbuffers(1, &fb_depth);
   1.158 +
   1.159 +		glBindTexture(GL_TEXTURE_2D, fb_tex);
   1.160 +		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   1.161 +		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   1.162 +	}
   1.163 +
   1.164 +	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
   1.165 +
   1.166 +	fb_tex_width = next_pow2(width);
   1.167 +	fb_tex_height = next_pow2(height);
   1.168 +
   1.169 +	glBindTexture(GL_TEXTURE_2D, fb_tex);
   1.170 +	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, fb_tex_width, fb_tex_height, 0,
   1.171 +			GL_RGBA, GL_UNSIGNED_BYTE, 0);
   1.172 +	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb_tex, 0);
   1.173 +
   1.174 +	glBindRenderbuffer(GL_RENDERBUFFER, fb_depth);
   1.175 +	glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, fb_tex_width, fb_tex_height);
   1.176 +	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, fb_depth);
   1.177 +
   1.178 +	if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
   1.179 +		fprintf(stderr, "incomplete framebuffer!\n");
   1.180 +	}
   1.181 +
   1.182 +	glBindFramebuffer(GL_FRAMEBUFFER, 0);
   1.183 +	printf("created render target: %dx%d (texture size: %dx%d)\n", width, height, fb_tex_width, fb_tex_height);
   1.184 +}
   1.185 +
   1.186 +int handle_event(SDL_Event *ev)
   1.187 +{
   1.188 +	switch(ev->type) {
   1.189 +	case SDL_KEYDOWN:
   1.190 +	case SDL_KEYUP:
   1.191 +		if(key_event(ev->key.keysym.sym, ev->key.state == SDL_PRESSED) == -1) {
   1.192 +			return -1;
   1.193 +		}
   1.194 +		break;
   1.195 +
   1.196 +	default:
   1.197 +		break;
   1.198 +	}
   1.199 +
   1.200 +	return 0;
   1.201 +}
   1.202 +
   1.203 +int key_event(int key, int state)
   1.204 +{
   1.205 +	if(state) {
   1.206 +		switch(key) {
   1.207 +		case 27:
   1.208 +			return -1;
   1.209 +
   1.210 +		default:
   1.211 +			break;
   1.212 +		}
   1.213 +	}
   1.214 +	return 0;
   1.215 +}