Debugging Attachment Point Transforms — Handmade Hero — Episode Guide

0:00Recap and set the stage for the day snapping cat heads onto bodies

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0:00Recap and set the stage for the day snapping cat heads onto bodies

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0:00Recap and set the stage for the day snapping cat heads onto bodies

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0:50Showcase the asset editing UI, with thoughts on scaling asset pieces

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0:50Showcase the asset editing UI, with thoughts on scaling asset pieces

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0:50Showcase the asset editing UI, with thoughts on scaling asset pieces

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5:24Storing and transforming alignment points of entities on-demand

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5:24Storing and transforming alignment points of entities on-demand

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5:24Storing and transforming alignment points of entities on-demand

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8:26Make UpdateAndRenderEntities() store PieceX, PieceY and PieceP as the basis in which we interpret alignment points

9:43Set up to break out PushBitmap() into utility functions that provide alignment information for our snapping procedure to use

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9:43Set up to break out PushBitmap() into utility functions that provide alignment information for our snapping procedure to use

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9:43Set up to break out PushBitmap() into utility functions that provide alignment information for our snapping procedure to use

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11:11Note the imprecision of our 2D sprite vs 3D geometry picking

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11:11Note the imprecision of our 2D sprite vs 3D geometry picking

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11:11Note the imprecision of our 2D sprite vs 3D geometry picking

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12:36Prepare to split up PushBitmap() and PushQuad()

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12:36Prepare to split up PushBitmap() and PushQuad()

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12:36Prepare to split up PushBitmap() and PushQuad()

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19:49Create handmade_renderer_geometry.cpp and .h, introducing WriteQuad() based on PushQuad()

28:29Introduce sprite_values and accompanying functions

35:15Implement PFromAlignP() and SpriteValuesForUpright() based on GetBitmapDim() and PushBitmap(), introducing SpriteDimFromWorldHeight()

42:46Introduce SpriteDimFromWorldHeight(), with a few words on extracting pieces of code into their own functions to be called in whatever combination necessary

45:04Reimplement SpriteValuesForUpright() based on PushUpright()

48:37Consider the problem of computing the Z-Bias of rotating sprites

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48:37Consider the problem of computing the Z-Bias of rotating sprites

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48:37Consider the problem of computing the Z-Bias of rotating sprites

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50:24Add a fourth dimension to the sprite_values axes

52:18Z-Bias of Rotated Sprites

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52:18Z-Bias of Rotated Sprites

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52:18Z-Bias of Rotated Sprites

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54:12Z-biasing sprites, respecting their suggested depth (i.e. ones whose lowermost point in Z is some way in from their bottom edge)

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54:12Z-biasing sprites, respecting their suggested depth (i.e. ones whose lowermost point in Z is some way in from their bottom edge)

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54:12Z-biasing sprites, respecting their suggested depth (i.e. ones whose lowermost point in Z is some way in from their bottom edge)

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1:01:02The mathematics of correct 2D sprite Z-biasing along the camera vector

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1:01:02The mathematics of correct 2D sprite Z-biasing along the camera vector

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1:01:02The mathematics of correct 2D sprite Z-biasing along the camera vector

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1:11:29Consider rolling the Z-bias projection from CompileZBiasProgram() into the vertex shader

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1:11:29Consider rolling the Z-bias projection from CompileZBiasProgram() into the vertex shader

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1:11:29Consider rolling the Z-bias projection from CompileZBiasProgram() into the vertex shader

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1:12:41Constructing the Z-bias projection inside the vertex shader

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1:12:41Constructing the Z-bias projection inside the vertex shader

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1:12:41Constructing the Z-bias projection inside the vertex shader

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1:16:31Simply sliding sprites forwards along the tile to simulate Z-alignment

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1:16:31Simply sliding sprites forwards along the tile to simulate Z-alignment

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1:16:31Simply sliding sprites forwards along the tile to simulate Z-alignment

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1:19:30Continue to implement SpriteValuesForUpright(), postponing our Z-bias story for now

1:29:38Make UpdateAndRenderEntities() use our new geometric rendering functions

1:32:42Run the game to see everything rendering as before

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1:32:42Run the game to see everything rendering as before

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1:32:42Run the game to see everything rendering as before

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1:32:55Prevent PushSprite() from taking a Size and instead take scaled axes

1:40:23See that the UI all looks fine

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1:40:23See that the UI all looks fine

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1:40:23See that the UI all looks fine

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1:40:43Change UpdateAndRenderEntities() to use PushSprite() rather than PushBitmap()

1:42:24Find that our sprites are misplaced

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1:42:24Find that our sprites are misplaced

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1:42:24Find that our sprites are misplaced

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1:43:01Investigate our sprite alignment bug

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1:43:01Investigate our sprite alignment bug

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1:43:01Investigate our sprite alignment bug

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1:46:36Fix the MinP computation in SpriteValuesForUpright()

1:46:58Find that our sprite placement is much better, pointing out our Z-bias problem

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1:46:58Find that our sprite placement is much better, pointing out our Z-bias problem

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1:46:58Find that our sprite placement is much better, pointing out our Z-bias problem

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1:47:48Decrease the pitch of our camera in UpdateAndRenderWorld()

1:49:28Traverse the world with our lower pitched camera, to find that it doesn't correctly interpolate between rooms

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1:49:28Traverse the world with our lower pitched camera, to find that it doesn't correctly interpolate between rooms

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1:49:28Traverse the world with our lower pitched camera, to find that it doesn't correctly interpolate between rooms

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1:51:31Increase our camera's Z-offset from the room in GetCameraOffsetZForDim()

1:53:51Speed up our build by commenting out some compilation lines

1:54:38Traverse the world, with our room interpolation working again, but not the lighting region

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1:54:38Traverse the world, with our room interpolation working again, but not the lighting region

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1:54:38Traverse the world, with our room interpolation working again, but not the lighting region

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1:56:57Set up to implement sprite snapping

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1:56:57Set up to implement sprite snapping

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1:56:57Set up to implement sprite snapping

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1:58:16Make UpdateAndRenderEntities() snap sprites together based on alignment points set in the UI, introducing FindAlign()

2:09:06Run the game to find that our cat hero's body oscillates between two locations

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2:09:06Run the game to find that our cat hero's body oscillates between two locations

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2:09:06Run the game to find that our cat hero's body oscillates between two locations

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2:09:30Enable UpdateAndRenderEntities() to handle snapping of pieces with no parent alignment point

2:12:27Find that our cat hero's body now correctly stays still

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2:12:27Find that our cat hero's body now correctly stays still

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2:12:27Find that our cat hero's body now correctly stays still

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2:12:43Investigate our alignment issue in UpdateAndRenderEntities()

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2:12:43Investigate our alignment issue in UpdateAndRenderEntities()

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2:12:43Investigate our alignment issue in UpdateAndRenderEntities()

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2:15:11Make AddCat() connect the Body piece to the world, introducing ConnectPieceToWorld()

2:20:48Step through UpdateAndRenderEntities() and inspect the bitmap pieces of our cat

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2:20:48Step through UpdateAndRenderEntities() and inspect the bitmap pieces of our cat

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2:20:48Step through UpdateAndRenderEntities() and inspect the bitmap pieces of our cat

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2:24:00Realise that the cat (not the cat hero) is showing up

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2:24:00Realise that the cat (not the cat hero) is showing up

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2:24:00Realise that the cat (not the cat hero) is showing up

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2:25:38Try snapping the regular cat's head to its body successfully, again noting our Z-bias problem

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2:25:38Try snapping the regular cat's head to its body successfully, again noting our Z-bias problem

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2:25:38Try snapping the regular cat's head to its body successfully, again noting our Z-bias problem

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2:28:17Q&A

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2:28:17Q&A

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2:28:17Q&A

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2:30:05xxthebigfoxx Q: Do you know anything about the state of the series Bitwise? We haven't heard anything from Per in the last two months

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2:30:05xxthebigfoxx Q: Do you know anything about the state of the series Bitwise? We haven't heard anything from Per in the last two months

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2:30:05xxthebigfoxx Q: Do you know anything about the state of the series Bitwise? We haven't heard anything from Per in the last two months

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2:30:39morglod Q: Why not render with the projection matrix + WM matrices to position?

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2:30:39morglod Q: Why not render with the projection matrix + WM matrices to position?

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2:30:39morglod Q: Why not render with the projection matrix + WM matrices to position?

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2:31:42centhusiast Q: Is wait-free multithreading as difficult as lock-free multithreading?¹

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2:31:42centhusiast Q: Is wait-free multithreading as difficult as lock-free multithreading?¹

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2:31:42centhusiast Q: Is wait-free multithreading as difficult as lock-free multithreading?¹

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2:37:41morglod Q: Why not render sprites with the projection matrix resetting its rotation (facing) towards camera?

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2:37:41morglod Q: Why not render sprites with the projection matrix resetting its rotation (facing) towards camera?

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2:37:41morglod Q: Why not render sprites with the projection matrix resetting its rotation (facing) towards camera?

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2:38:45Demo the sprite Z-biasing

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2:38:45Demo the sprite Z-biasing

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2:38:45Demo the sprite Z-biasing

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2:41:25pythno Q: Can you explain again briefly how you might want to solve the problem of sprites penetrating the ground? Maybe the sprites have to be at a lower angle to the floor so they won't intersect that easily and distort the texture so it looks correct again?

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2:41:25pythno Q: Can you explain again briefly how you might want to solve the problem of sprites penetrating the ground? Maybe the sprites have to be at a lower angle to the floor so they won't intersect that easily and distort the texture so it looks correct again?

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2:41:25pythno Q: Can you explain again briefly how you might want to solve the problem of sprites penetrating the ground? Maybe the sprites have to be at a lower angle to the floor so they won't intersect that easily and distort the texture so it looks correct again?

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2:42:11techzone707 Q: Have you read Communicating Sequential Processes by Tony Hoare?²

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2:42:11techzone707 Q: Have you read Communicating Sequential Processes by Tony Hoare?²

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2:42:11techzone707 Q: Have you read Communicating Sequential Processes by Tony Hoare?²

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2:42:15garryjohanson Q: Would you mind posting that multithreading paper³ in chat?

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2:42:15garryjohanson Q: Would you mind posting that multithreading paper³ in chat?

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2:42:15garryjohanson Q: Would you mind posting that multithreading paper³ in chat?

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2:42:50omfgcookies Q: Are you planning on allowing camera rotation in the final game? You could reface after certain angles so it still gives you some of what you want

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2:42:50omfgcookies Q: Are you planning on allowing camera rotation in the final game? You could reface after certain angles so it still gives you some of what you want

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2:42:50omfgcookies Q: Are you planning on allowing camera rotation in the final game? You could reface after certain angles so it still gives you some of what you want

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2:43:49Close it up

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2:43:49Close it up

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2:43:49Close it up

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