Implemented a Sound Mixer — Handmade Hero — Episode Guide

1:26Recap and set the stage for the day

4:24handmade.h: Introduce playing_sound and add a pointer to it in game_state

7:55handmade.cpp: Setup the PlayingSound loop

10:12Blackboard: Working in a 32-bit depth mixing buffer

11:43handmade.cpp: Introduce RealChannel0 and RealChannel1

12:56handmade_asset.h: Introduce loaded_sound

13:22handmade.cpp: Call loaded_sound and sum the Samples in our loop

18:32handmade.cpp: Loop over the summed sounds, read out of them and write them to the SampleOut buffer

22:21handmade.cpp: Introduce SamplesToMix and SamplesRemainingInSound to handle the finite nature of the audio

25:28handmade.h: Add playing_sound *FirstFreePlayingSound to game_state

25:51handmade.cpp: Use that FirstFreePlayingSound in the PlayingSound loop

26:23handmade.cpp: Snap the Next pointer earlier in order to protect against the act of having it freed screw up our iteration

28:00handmade.h: Introduce the concept of a MetaArena

31:11handmade_asset.h: Add audio assets to asset_type_id

32:10handmade_asset.cpp: Extend the asset loading to handle audio

34:27handmade_asset.cpp: Introduce AddSoundAsset

36:26handmade.cpp: Make the new system emulate what we had at the start of the stream

39:01handmade_asset.cpp: Introduce GetFirstSlotID and various Get functions for Bitmaps and Sound

45:31Debugger: Step through the asset loading code

45:51handmade_asset.cpp: Set the SoundCount to be 256 * Asset_Count

46:11Debugger: Inspect GameState->FirstPlayingSound

46:35handmade_asset.cpp: Turn it up to full blast

47:04Debugger: Step into LoadedSound

48:27build.bat: Switch to -O2 and run the game

50:13handmade.cpp: Introduce PlaySound

53:40Run the game and hear our sound

53:45handmade.cpp: Call PlaySound upon triggering the Sword

55:09handmade.h: Add random_series GeneralEntropy to game_state

56:36Run the game and find that it almost works

56:55handmade.cpp: Investigate the bug

57:34Blackboard: Linked list

58:14handmade.cpp: Correctly construct this linked list

1:01:28Debugger: Step through the playing_sound linked list

1:04:44handmade.cpp: Reset SamplesPlayed to 0 in PlaySound

1:05:33Run the game and hear our sound

1:06:20Q&A

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1:06:20Q&A

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1:06:20Q&A

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1:07:33robrobby s the sound buffer logarithmic or linear (decibel or linear values) and do we (have to) account for that in building the sums for the buffer?

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1:07:33robrobby s the sound buffer logarithmic or linear (decibel or linear values) and do we (have to) account for that in building the sums for the buffer?

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1:07:33robrobby s the sound buffer logarithmic or linear (decibel or linear values) and do we (have to) account for that in building the sums for the buffer?

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1:08:04allgamesnetworkvideo Do you already have someone composing the soundtrack?

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1:08:04allgamesnetworkvideo Do you already have someone composing the soundtrack?

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1:08:04allgamesnetworkvideo Do you already have someone composing the soundtrack?

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1:09:52tfnw A reminder about the parameter order in InterlockedIncrement and the bug it covers up

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1:09:52tfnw A reminder about the parameter order in InterlockedIncrement and the bug it covers up

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1:09:52tfnw A reminder about the parameter order in InterlockedIncrement and the bug it covers up

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1:10:41handmade_asset.cpp: Handle the case when BeginTaskWithMemory in LoadBitmap fails

1:12:04flaturated When mixing a mono sound to stereo, volume of each channel should be 50% for center panned

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1:12:04flaturated When mixing a mono sound to stereo, volume of each channel should be 50% for center panned

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1:12:04flaturated When mixing a mono sound to stereo, volume of each channel should be 50% for center panned

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1:13:32soysaucethekid Will this audio code allow you to play the same sound simultaneously (i.e. if you start the same sound before it finishes the first time)?

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1:13:32soysaucethekid Will this audio code allow you to play the same sound simultaneously (i.e. if you start the same sound before it finishes the first time)?

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1:13:32soysaucethekid Will this audio code allow you to play the same sound simultaneously (i.e. if you start the same sound before it finishes the first time)?

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1:13:53tfnw The second and third parameters in the compare and swap

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1:13:53tfnw The second and third parameters in the compare and swap

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1:13:53tfnw The second and third parameters in the compare and swap

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1:14:39handmade_intrinsics.h: Swap those parameters in AtomicCompareExchangeUInt32 and then swap them back and instead change the funtions where it's called

1:16:54soysaucethekid The audio seems to be frame rate dependent at the moment. Could putting it in a separate thread or using interrupts (if you can), make it not frame rate dependent?

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1:16:54soysaucethekid The audio seems to be frame rate dependent at the moment. Could putting it in a separate thread or using interrupts (if you can), make it not frame rate dependent?

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1:16:54soysaucethekid The audio seems to be frame rate dependent at the moment. Could putting it in a separate thread or using interrupts (if you can), make it not frame rate dependent?

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1:18:35tfnw Would you mind adding a __sync_val_compare_and_swap(Value, Expected, New) for gcc / clang

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1:18:35tfnw Would you mind adding a __sync_val_compare_and_swap(Value, Expected, New) for gcc / clang

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1:18:35tfnw Would you mind adding a __sync_val_compare_and_swap(Value, Expected, New) for gcc / clang

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1:18:55handmade_intrinsics.h: Add tfnw's suggestion

1:20:50handmade.cpp: Play the music instead of the bloop, to demonstrate playing the same sound simultaneously

1:22:14robrobby So why does it work?

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1:22:14robrobby So why does it work?

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1:22:14robrobby So why does it work?

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1:22:54Blackboard: Separating asset data from instance data

1:24:35cubercaleb Why use a linked list as opposed to another data structure like a vector?

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1:24:35cubercaleb Why use a linked list as opposed to another data structure like a vector?

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1:24:35cubercaleb Why use a linked list as opposed to another data structure like a vector?

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1:25:52waterlimon But can you take the output of the sound summer mechanism and play that?

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1:25:52waterlimon But can you take the output of the sound summer mechanism and play that?

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1:25:52waterlimon But can you take the output of the sound summer mechanism and play that?

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1:26:08Go ahead and call it

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1:26:08Go ahead and call it

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1:26:08Go ahead and call it

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