vrheights: 690ef7fa791f src/game.cc

vrheights

view src/game.cc @ 4:690ef7fa791f

foo

author	John Tsiombikas <nuclear@member.fsf.org>
date	Fri, 26 Sep 2014 13:19:22 +0300
parents	316ec8250af2
children	053a52f0cb64

line source

1 #include <stdio.h>

2 #include <assert.h>

3 #include <algorithm>

4 #include <vmath/vmath.h>

5 #include "opengl.h"

6 #include "game.h"

7 #include "goatvr.h"

8 #include "teapot.h"

10 static void draw_scene();

11 static void material(float r, float g, float b, float roughness);

12 static void toggle_hmd_fullscr();

13 static void create_rtarg(int x, int y);

14 static int next_pow2(int x);

16 static int win_width, win_height;

17 static unsigned int fb_tex;

18 static unsigned int fbo, fb_depth;

19 static int fb_xsz, fb_ysz;

20 static int fb_tex_xsz, fb_tex_ysz;

22 static float cam_theta, cam_phi;

23 static Vector3 cam_pos;

24 static bool keystate[256];

26 bool game_init()

27 {

28 init_opengl();

30 if(vr_init() == -1) {

31 return false;

32 }

34 glEnable(GL_DEPTH_TEST);

35 glEnable(GL_CULL_FACE);

36 glEnable(GL_LIGHTING);

38 return true;

39 }

41 void game_cleanup()

42 {

43 vr_shutdown();

44 }

46 void game_update(long tm)

47 {

48 static long prev_upd;

49 float dt = (tm - prev_upd) / 1000.0;

50 prev_upd = tm;

52 float offs = dt * 1.0;

53 Vector3 dir;

55 if(keystate['d'] || keystate['D']) {

56 dir += Vector3(offs, 0, 0);

57 }

58 if(keystate['a'] || keystate['A']) {

59 dir += Vector3(-offs, 0, 0);

60 }

61 if(keystate['w'] || keystate['W']) {

62 dir += Vector3(0, 0, -offs);

63 }

64 if(keystate['s'] || keystate['S']) {

65 dir += Vector3(0, 0, offs);

66 }

68 cam_pos.x += dir.x * cos(cam_theta) - dir.y * sin(cam_theta);

69 cam_pos.z += dir.x * sin(cam_theta) + dir.y * cos(cam_theta);

70 }

72 void game_display()

73 {

74 glBindFramebuffer(GL_FRAMEBUFFER, fbo);

75 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

77 for(int i=0; i<2; i++) {

78 glViewport(i == 0 ? 0 : fb_xsz / 2, 0, fb_xsz / 2, fb_ysz);

79 vr_begin(i);

81 float proj[16];

82 if(vr_proj_matrix(i, 0.5, 500.0, proj)) {

83 glMatrixMode(GL_PROJECTION);

84 glLoadMatrixf(proj);

85 }

87 glMatrixMode(GL_MODELVIEW);

89 float view[16];

90 vr_view_matrix(i, view);

91 glLoadMatrixf(view);

92 glRotatef(cam_phi, 1, 0, 0);

93 glRotatef(cam_theta, 0, 1, 0);

94 /* move the camera to the eye level of the user */

95 glTranslatef(0, -vr_getf_def(VR_EYE_HEIGHT, 1.65), 0);

96 glTranslatef(-cam_pos.x, -cam_pos.y, -cam_pos.z);

98 draw_scene();

100 vr_end();

101 }

102

103 glBindFramebuffer(GL_FRAMEBUFFER, 0);

104 glViewport(0, 0, win_width, win_height);

105

106 vr_swap_buffers();

107 assert(glGetError() == GL_NO_ERROR);

108 }

109

110 void game_reshape(int x, int y)

111 {

112 win_width = x;

113 win_height = y;

114

115 create_rtarg(vr_geti_def(VR_RENDER_XRES, x), vr_geti_def(VR_RENDER_YRES, y));

116 vr_output_texture(fb_tex, 0, 0, (float)fb_xsz / (float)fb_tex_xsz, (float)fb_ysz / (float)fb_tex_ysz);

117

118 /* these might be overriden in VR mode (see game_display) */

119 glViewport(0, 0, x, y);

120 glMatrixMode(GL_PROJECTION);

121 glLoadIdentity();

122 gluPerspective(50.0, (float)x / (float)y, 0.5, 500.0);

123 }

124

125 void game_keyboard(int key, bool pressed)

126 {

127 if(pressed) {

128 switch(key) {

129 case 27:

130 exit_game();

131 break;

132

133 case 'f':

134 toggle_hmd_fullscr();

135 break;

136

137 case 'r':

138 vr_recenter();

139 break;

140

141 default:

142 break;

143 }

144 }

145

146 if(key < 256) {

147 keystate[key] = pressed;

148 }

149 }

150

151

152 static int prev_x, prev_y;

153 static bool bnstate[32];

154

155 void game_mouse_button(int bn, bool state, int x, int y)

156 {

157 bnstate[bn] = state;

158 prev_x = x;

159 prev_y = y;

160 }

161

162 void game_mouse_motion(int x, int y)

163 {

164 int dx = x - prev_x;

165 int dy = y - prev_y;

166 prev_x = x;

167 prev_y = y;

168

169 if(!dx && !dy) {

170 return;

171 }

172 if(bnstate[0]) {

173 cam_theta += dx * 0.5;

174 cam_phi += dy * 0.5;

175

176 if(cam_phi < -90) cam_phi = -90;

177 if(cam_phi > 90) cam_phi = 90;

178 }

179 }

180

181 static void draw_scene()

182 {

183 float lpos[][4] = {

184 {-0.7, 0.7, 1, 0},

185 {1, 0, 1, 0}

186 };

187 float lcol[][4] = {

188 {0.9, 0.7, 0.6, 1},

189 {0.3, 0.4, 0.75, 1}

190 };

191 for(int i=0; i<2; i++) {

192 glEnable(GL_LIGHT0 + i);

193 glLightfv(GL_LIGHT0 + i, GL_POSITION, lpos[i]);

194 glLightfv(GL_LIGHT0 + i, GL_DIFFUSE, lcol[i]);

195 glLightfv(GL_LIGHT0 + i, GL_SPECULAR, lcol[i]);

196 }

197

198 glMatrixMode(GL_MODELVIEW);

199

200 material(1, 1, 1, 1);

201 glBegin(GL_QUADS);

202 glNormal3f(0, 1, 0);

203 glVertex3f(-10, 0, 10);

204 glVertex3f(10, 0, 10);

205 glVertex3f(10, 0, -10);

206 glVertex3f(-10, 0, -10);

207 glEnd();

208

209 material(1, 1, 1, 0.4);

210 glPushMatrix();

211 glTranslatef(0, 1.3, -10);

212 glFrontFace(GL_CW);

213 bezier_teapot(2.0);

214 glFrontFace(GL_CCW);

215 glPopMatrix();

216 }

217

218 static void material(float r, float g, float b, float roughness)

219 {

220 float gloss = 1.0 - roughness;

221 float diffuse[] = {r * roughness, g * roughness, b * roughness, 1.0};

222 float specular[] = {gloss, gloss, gloss, 1.0};

223 float shin = gloss * 128.0;

224

225 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, diffuse);

226 glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, specular);

227 glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, shin);

228 }

229

230

231 static void toggle_hmd_fullscr()

232 {

233 static bool fullscr;

234 static int prev_x, prev_y;

235 //static int prev_xsz, prev_ysz;

236

237 fullscr = !fullscr;

238 if(fullscr) {

239 /* entering fullscreen on the HMD */

240 int xoffs = vr_geti_def(VR_WIN_XOFFS, -1);

241 int yoffs = vr_geti_def(VR_WIN_YOFFS, -1);

242 if(xoffs != -1) {

243 get_window_pos(&prev_x, &prev_y);

244 move_window(xoffs, yoffs);

245 }

246

247 int xsz = vr_geti_def(VR_DISPLAY_WIDTH, -1);

248 int ysz = vr_geti_def(VR_DISPLAY_HEIGHT, -1);

249 if(xsz != -1) {

250 //prev_xsz = win_width;

251 //prev_ysz = win_height;

252 resize_window(xsz, ysz);

253 }

254 enter_fullscreen();

255

256 } else {

257 /* leaving fullscreen */

258 leave_fullscreen();

259 /*move_window(prev_x, prev_y);

260 resize_window(prev_xsz, prev_ysz);*/

261 }

262 }

263

264 static void create_rtarg(int x, int y)

265 {

266 if(x == fb_xsz && y == fb_ysz) {

267 return; // nothing changed

268 }

269

270 fb_xsz = x;

271 fb_ysz = y;

272 fb_tex_xsz = next_pow2(fb_xsz);

273 fb_tex_ysz = next_pow2(fb_ysz);

274

275 if(!fbo) {

276 glGenFramebuffers(1, &fbo);

277

278 glGenTextures(1, &fb_tex);

279 glBindTexture(GL_TEXTURE_2D, fb_tex);

280 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

281 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

282

283 glGenRenderbuffers(1, &fb_depth);

284 }

285

286 glBindFramebuffer(GL_FRAMEBUFFER, fbo);

287

288 glBindTexture(GL_TEXTURE_2D, fb_tex);

289 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, fb_tex_xsz, fb_tex_ysz, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);

290 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb_tex, 0);

291

292 glBindRenderbuffer(GL_RENDERBUFFER, fb_depth);

293 glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, fb_tex_xsz, fb_tex_ysz);

294 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, fb_depth);

295

296 assert(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);

297 glBindFramebuffer(GL_FRAMEBUFFER, 0);

298 }

299

300 static int next_pow2(int x)

301 {

302 x -= 1;

303 x |= x >> 1;

304 x |= x >> 2;

305 x |= x >> 4;

306 x |= x >> 8;

307 x |= x >> 16;

308 return x + 1;

309 }