cinera_handmade.network/cmuratori/hero/code/code140.hmml

[video output=day140 member=cmuratori stream_platform=twitch stream_username=handmade_hero project=code title="Implemented a Sound Mixer" vod_platform=youtube id=UuqcgQxpfO8 annotator=Miblo]
[1:26][Recap and set the stage for the day]
[4:24][handmade.h: Introduce playing_sound and add a pointer to it in game_state]
[7:55][handmade.cpp: Setup the PlayingSound loop]
[10:12][Blackboard: Working in a 32-bit depth mixing buffer]
[11:43][handmade.cpp: Introduce RealChannel0 and RealChannel1]
[12:56][handmade_asset.h: Introduce loaded_sound]
[13:22][handmade.cpp: Call loaded_sound and sum the Samples in our loop]
[18:32][handmade.cpp: Loop over the summed sounds, read out of them and write them to the SampleOut buffer]
[22:21][handmade.cpp: Introduce SamplesToMix and SamplesRemainingInSound to handle the finite nature of the audio]
[25:28][handmade.h: Add playing_sound *FirstFreePlayingSound to game_state]
[25:51][handmade.cpp: Use that FirstFreePlayingSound in the PlayingSound loop]
[26:23][handmade.cpp: Snap the Next pointer earlier in order to protect against the act of having it freed screw up our iteration]
[28:00][handmade.h: Introduce the concept of a MetaArena]
[31:11][handmade_asset.h: Add audio assets to asset_type_id]
[32:10][handmade_asset.cpp: Extend the asset loading to handle audio]
[34:27][handmade_asset.cpp: Introduce AddSoundAsset]
[36:26][handmade.cpp: Make the new system emulate what we had at the start of the stream]
[39:01][handmade_asset.cpp: Introduce GetFirstSlotID and various Get functions for Bitmaps and Sound]
[45:31][Debugger: Step through the asset loading code]
[45:51][handmade_asset.cpp: Set the SoundCount to be 256 * Asset_Count]
[46:11][Debugger: Inspect GameState->FirstPlayingSound]
[46:35][handmade_asset.cpp: Turn it up to full blast]
[47:04][Debugger: Step into LoadedSound]
[48:27][build.bat: Switch to -O2 and run the game]
[50:13][handmade.cpp: Introduce PlaySound]
[53:40][Run the game and hear our sound]
[53:45][handmade.cpp: Call PlaySound upon triggering the Sword]
[55:09][handmade.h: Add random_series GeneralEntropy to game_state]
[56:36][Run the game and find that it almost works]
[56:55][handmade.cpp: Investigate the bug]
[57:34][Blackboard: Linked list]
[58:14][handmade.cpp: Correctly construct this linked list]
[1:01:28][Debugger: Step through the playing_sound linked list]
[1:04:44][handmade.cpp: Reset SamplesPlayed to 0 in PlaySound]
[1:05:33][Run the game and hear our sound]
[1:06:20][Q&A][:speech]
[1:07:33][@robrobby][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?]
[1:08:04][@allgamesnetworkvideo][Do you already have someone composing the soundtrack?]
[1:09:52][@tfnw][A reminder about the parameter order in InterlockedIncrement and the bug it covers up]
[1:10:41][handmade_asset.cpp: Handle the case when BeginTaskWithMemory in LoadBitmap fails]
[1:12:04][@flaturated][When mixing a mono sound to stereo, volume of each channel should be 50% for center panned]
[1:13:32][@soysaucethekid][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)?]
[1:13:53][@tfnw][The second and third parameters in the compare and swap]
[1:14:39][handmade_intrinsics.h: Swap those parameters in AtomicCompareExchangeUInt32 and then swap them back and instead change the funtions where it's called]
[1:16:54][@soysaucethekid][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?]
[1:18:35][@tfnw][Would you mind adding a __sync_val_compare_and_swap(Value, Expected, New) for gcc / clang]
[1:18:55][handmade_intrinsics.h: Add tfnw's suggestion]
[1:20:50][handmade.cpp: Play the music instead of the bloop, to demonstrate playing the same sound simultaneously]
[1:22:14][@robrobby][So why does it work?]
[1:22:54][Blackboard: Separating asset data from instance data]
[1:24:35][@cubercaleb][Why use a linked list as opposed to another data structure like a vector?]
[1:25:52][@waterlimon][But can you take the output of the sound summer mechanism and play that?]
[1:26:08][Go ahead and call it][:speech]
[/video]
Cinera 0.7.0 Update Add output parameter to all of hero/code, hero/intro-to-c and hero/misc, preserving the current URLs while allowing different .hmml filenames, notably for hero/misc which now gets sorted chronologically. Update the cinera__*.css files 2020-05-09 20:59:36 +00:00			`[video output=day140 member=cmuratori stream_platform=twitch stream_username=handmade_hero project=code title="Implemented a Sound Mixer" vod_platform=youtube id=UuqcgQxpfO8 annotator=Miblo]`
Relocate riscy and add newly converted hero The idea here is to reduce the amount of superfluous stuff downloaded to each server running cinera 2017-12-06 22:26:13 +00:00			`[1:26][Recap and set the stage for the day]`
			`[4:24][handmade.h: Introduce playing_sound and add a pointer to it in game_state]`
			`[7:55][handmade.cpp: Setup the PlayingSound loop]`
			`[10:12][Blackboard: Working in a 32-bit depth mixing buffer]`
			`[11:43][handmade.cpp: Introduce RealChannel0 and RealChannel1]`
			`[12:56][handmade_asset.h: Introduce loaded_sound]`
			`[13:22][handmade.cpp: Call loaded_sound and sum the Samples in our loop]`
			`[18:32][handmade.cpp: Loop over the summed sounds, read out of them and write them to the SampleOut buffer]`
			`[22:21][handmade.cpp: Introduce SamplesToMix and SamplesRemainingInSound to handle the finite nature of the audio]`
			`[25:28][handmade.h: Add playing_sound *FirstFreePlayingSound to game_state]`
			`[25:51][handmade.cpp: Use that FirstFreePlayingSound in the PlayingSound loop]`
			`[26:23][handmade.cpp: Snap the Next pointer earlier in order to protect against the act of having it freed screw up our iteration]`
			`[28:00][handmade.h: Introduce the concept of a MetaArena]`
			`[31:11][handmade_asset.h: Add audio assets to asset_type_id]`
			`[32:10][handmade_asset.cpp: Extend the asset loading to handle audio]`
			`[34:27][handmade_asset.cpp: Introduce AddSoundAsset]`
			`[36:26][handmade.cpp: Make the new system emulate what we had at the start of the stream]`
			`[39:01][handmade_asset.cpp: Introduce GetFirstSlotID and various Get functions for Bitmaps and Sound]`
			`[45:31][Debugger: Step through the asset loading code]`
			`[45:51][handmade_asset.cpp: Set the SoundCount to be 256 * Asset_Count]`
			`[46:11][Debugger: Inspect GameState->FirstPlayingSound]`
			`[46:35][handmade_asset.cpp: Turn it up to full blast]`
			`[47:04][Debugger: Step into LoadedSound]`
			`[48:27][build.bat: Switch to -O2 and run the game]`
			`[50:13][handmade.cpp: Introduce PlaySound]`
			`[53:40][Run the game and hear our sound]`
			`[53:45][handmade.cpp: Call PlaySound upon triggering the Sword]`
			`[55:09][handmade.h: Add random_series GeneralEntropy to game_state]`
			`[56:36][Run the game and find that it almost works]`
			`[56:55][handmade.cpp: Investigate the bug]`
			`[57:34][Blackboard: Linked list]`
			`[58:14][handmade.cpp: Correctly construct this linked list]`
			`[1:01:28][Debugger: Step through the playing_sound linked list]`
			`[1:04:44][handmade.cpp: Reset SamplesPlayed to 0 in PlaySound]`
			`[1:05:33][Run the game and hear our sound]`
Fix some incorrectly converted annotations Also apply some :speech categorisation 2018-03-07 21:48:09 +00:00			`[1:06:20][Q&A][:speech]`
Relocate riscy and add newly converted hero The idea here is to reduce the amount of superfluous stuff downloaded to each server running cinera 2017-12-06 22:26:13 +00:00			`[1:07:33][@robrobby][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?]`
			`[1:08:04][@allgamesnetworkvideo][Do you already have someone composing the soundtrack?]`
			`[1:09:52][@tfnw][A reminder about the parameter order in InterlockedIncrement and the bug it covers up]`
			`[1:10:41][handmade_asset.cpp: Handle the case when BeginTaskWithMemory in LoadBitmap fails]`
			`[1:12:04][@flaturated][When mixing a mono sound to stereo, volume of each channel should be 50% for center panned]`
			`[1:13:32][@soysaucethekid][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)?]`
			`[1:13:53][@tfnw][The second and third parameters in the compare and swap]`
			`[1:14:39][handmade_intrinsics.h: Swap those parameters in AtomicCompareExchangeUInt32 and then swap them back and instead change the funtions where it's called]`
			`[1:16:54][@soysaucethekid][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?]`
			`[1:18:35][@tfnw][Would you mind adding a __sync_val_compare_and_swap(Value, Expected, New) for gcc / clang]`
			`[1:18:55][handmade_intrinsics.h: Add tfnw's suggestion]`
			`[1:20:50][handmade.cpp: Play the music instead of the bloop, to demonstrate playing the same sound simultaneously]`
			`[1:22:14][@robrobby][So why does it work?]`
			`[1:22:54][Blackboard: Separating asset data from instance data]`
			`[1:24:35][@cubercaleb][Why use a linked list as opposed to another data structure like a vector?]`
			`[1:25:52][@waterlimon][But can you take the output of the sound summer mechanism and play that?]`
Fix some incorrectly converted annotations Also apply some :speech categorisation 2018-03-07 21:48:09 +00:00			`[1:26:08][Go ahead and call it][:speech]`
Relocate riscy and add newly converted hero The idea here is to reduce the amount of superfluous stuff downloaded to each server running cinera 2017-12-06 22:26:13 +00:00			`[/video]`