| 278 | } |
| 279 | |
| 280 | void PlayScene::DoFrame() { |
| 281 | float deltaT = mFrameClock.ReadDelta(); |
| 282 | float previousY = mPlayerPos.y; |
| 283 | |
| 284 | // clear screen |
| 285 | glClearColor(0.0, 0.0, 0.0, 1.0); |
| 286 | glEnable(GL_DEPTH_TEST); |
| 287 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
| 288 | |
| 289 | // rotate the view matrix according to current roll angle |
| 290 | glm::vec3 upVec = glm::vec3(-sin(mRollAngle), 0, cos(mRollAngle)); |
| 291 | |
| 292 | // set up view matrix according to player's ship position and direction |
| 293 | mViewMat = glm::lookAt(mPlayerPos, mPlayerPos + mPlayerDir, upVec); |
| 294 | |
| 295 | // render tunnel walls |
| 296 | RenderTunnel(); |
| 297 | |
| 298 | // render obstacles |
| 299 | RenderObstacles(); |
| 300 | |
| 301 | if (mMenu) { |
| 302 | RenderMenu(); |
| 303 | // nothing more to do |
| 304 | return; |
| 305 | } |
| 306 | |
| 307 | // render HUD (lives, score, etc) |
| 308 | RenderHUD(); |
| 309 | |
| 310 | // deduct from the time remaining to remove a sign from the screen |
| 311 | if (mSignText && mSignExpires) { |
| 312 | mSignTimeLeft -= deltaT; |
| 313 | if (mSignTimeLeft < 0.0f) { |
| 314 | mSignText = NULL; |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | // if a "saved checkpoint" sign pending? Can we show it right now? |
| 319 | if (!mSignText && mCheckpointSignPending) { |
| 320 | mCheckpointSignPending = false; |
| 321 | ShowSign(S_CHECKPOINT_SAVED, SIGN_DURATION); |
| 322 | } |
| 323 | |
| 324 | // did we already show the howto? |
| 325 | if (!mShowedHowto && mDifficulty == 0) { |
| 326 | mShowedHowto = true; |
| 327 | ShowSign(S_HOWTO_WITHOUT_JOY, SIGN_DURATION); |
| 328 | } |
| 329 | |
| 330 | // deduct from the time remaining on the blinking heart animation |
| 331 | if (mBlinkingHeart && Clock() > mBlinkingHeartExpire) { |
| 332 | mBlinkingHeart = false; |
| 333 | } |
| 334 | |
| 335 | // update speed |
| 336 | float targetSpeed = PLAYER_SPEED + PLAYER_SPEED_INC_PER_LEVEL * mDifficulty; |
| 337 | float accel = mPlayerSpeed >= 0.0f ? PLAYER_ACCELERATION_POSITIVE_SPEED |