Attempting (and Failing) to Fix the Clock — Handmade Hero — Episode Guide

0:02Recap and set the stage for the day

2:44Run the game, consult the profiler and note that the game only updates itself as if it's running at 60FPS

9:51Determine to enable the game to play properly at various frame rates

12:33win32_handmade.cpp: Temporarily set TargetSecondsPerFrame to twice the expected rate, and run the game to see that it feels like the 60FPS version

16:54win32_handmade.cpp: Initialise TargetSecondsPerFrame in the game loop

21:22Blackboard: Computing the TargetSecondsPerFrame based on observed seconds elapsed

24:57win32_handmade.cpp: Compute MeasuredSecondsPerFrame and ExactTargetSecondsPerFrame

26:06Blackboard: Rounding seconds, accounting for jittering

26:58Run the game to show the jittering frame rate

28:50win32_handmade.cpp: Round the ExactTargetSecondsPerFrame and run the game to show that

30:14win32_handmade.cpp: Make the debug system display the ExpectedFramesPerUpdate

31:40Run the game and consult the profiler to see the ExpectedFramesPerUpdate oscillating

34:34win32_handmade.cpp: Consult the documentation on wglSwapInterval¹

37:40win32_handmade.cpp: Pass 2 to wglSwapInterval(), run the game and investigate what wglSwapInterval is doing²

40:51Temporarily disable HANDMADE_STREAMING and run the game to see that the wglSwapInterval works more correctly

44:04Determine the refresh rate of the monitor

48:00win32_handmade.cpp: Set the TargetSecondsPerFrame to the MeasuredSecondsPerFrame of the previous frame

49:33Run the game and note all the jitter

51:16Try (unsuccessfully) to set a Swap Interval Override in the video driver

56:59Run the game and note that the movement speed is correct at lower frame rates

1:00:23Determine to get back to working on the camera, fading out floors above the hero

1:01:36"ATI peed on our cake"^α

1:02:04Run the game and consider how to fade out upper floors

1:03:02handmade_world_mode.cpp: Increase the NearClipPlane and run the game to see that upper floors have been clipped out, and peel away gradually while moving between floors

1:06:08handmade_opengl.cpp: Enable the shader to modulate the fragments' alpha amounts by their distance from the camera

1:08:15Run the game to see how that looks

1:11:53Blackboard: The original idea for clipping out upper levels

1:13:33Blackboard: Depth peel

1:16:40Blackboard: Depth peel vs multi-sampling with alpha to coverage

1:21:30handmade_opengl.cpp: Enable OpenGLRenderCommands() to handle GL_TEXTURE_2D slots³^,4

1:28:19Run the game without multisampling on

1:29:35Blackboard: Comparing two depth buffers

1:31:13handmade_opengl.cpp: Introduce a DepthSampler

1:33:27Consult the documentation on gl_FragCoord⁵^,6

1:36:45handmade_opengl.cpp: Enable the DepthPeel code to discard fragments nearer the camera than the ClipDepth

1:39:47handmade_opengl.h: Introduce opengl_program struct and CompileZBiasProgram()

1:44:32handmade_opengl.cpp: Introduce UseProgramBegin() and UseProgramEnd()

1:48:22handmade_opengl.cpp: Make the shader call CompileZBiasProgram() for NoDepthPeel and DepthPeel, and fix compile errors

1:53:35Run the game to see that we can run the DepthPeel and regular versions

1:54:13Q&A

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1:54:13Q&A

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1:54:13Q&A

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1:55:53garryjohanson While we wait for other questions, have you had a good experience with gdb?

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1:55:53garryjohanson While we wait for other questions, have you had a good experience with gdb?

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1:55:53garryjohanson While we wait for other questions, have you had a good experience with gdb?

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1:59:50uplinkcoder How to stabilize the volume outlines?

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1:59:50uplinkcoder How to stabilize the volume outlines?

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1:59:50uplinkcoder How to stabilize the volume outlines?

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2:00:33handmade_render_group.cpp: Make PushLineSegment() give the debug line segments some ZBias

2:01:14Run the game to see that the Z-fighting has gone

2:01:59acoto87 To follow the rule of writing the usage code first, don't believe that the project is at a point where it is better to advance in the game now, and when the game needs more engine features, then go and implement them?

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2:01:59acoto87 To follow the rule of writing the usage code first, don't believe that the project is at a point where it is better to advance in the game now, and when the game needs more engine features, then go and implement them?

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2:01:59acoto87 To follow the rule of writing the usage code first, don't believe that the project is at a point where it is better to advance in the game now, and when the game needs more engine features, then go and implement them?

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2:06:32uplinkcoder Clarification: what to do when the angles are too close together?

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2:06:32uplinkcoder Clarification: what to do when the angles are too close together?

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2:06:32uplinkcoder Clarification: what to do when the angles are too close together?

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2:07:02jessermeyer The debug text is drawing behind tree sprites, by the way

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2:07:02jessermeyer The debug text is drawing behind tree sprites, by the way

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2:07:02jessermeyer The debug text is drawing behind tree sprites, by the way

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2:07:31handmade_render_group.h: Add a depth_clear render_group_entry_type and introduce PushDepthClear() for DEBUGStart() to call

2:09:57Run the game to see the debug text always drawn on top

2:10:37kilo_pasztetowej Do you have any idea when the engine layer will be finished, and you move to just gameplay programming?

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2:10:37kilo_pasztetowej Do you have any idea when the engine layer will be finished, and you move to just gameplay programming?

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2:10:37kilo_pasztetowej Do you have any idea when the engine layer will be finished, and you move to just gameplay programming?

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2:11:41jezzi23 I'm not sure if the profiler shows some insightful information about CPU cache hit / miss rates. How might you implement something like that?

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2:11:41jezzi23 I'm not sure if the profiler shows some insightful information about CPU cache hit / miss rates. How might you implement something like that?

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2:11:41jezzi23 I'm not sure if the profiler shows some insightful information about CPU cache hit / miss rates. How might you implement something like that?

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2:14:28chrysos42 Can the depth buffer contain infinity as a floating point value?

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2:14:28chrysos42 Can the depth buffer contain infinity as a floating point value?

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2:14:28chrysos42 Can the depth buffer contain infinity as a floating point value?

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2:16:24kilo_pasztetowej Off-topic: What part of game programming do you enjoy the most? Engine, gameplay, etc?

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2:16:24kilo_pasztetowej Off-topic: What part of game programming do you enjoy the most? Engine, gameplay, etc?

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2:16:24kilo_pasztetowej Off-topic: What part of game programming do you enjoy the most? Engine, gameplay, etc?

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2:16:42Close things down

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2:16:42Close things down

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2:16:42Close things down

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