Adding Per-Element Clipping Rectangles — Handmade Hero — Episode Guide

1:00Recap and set the stage for the day

5:07Pig Hat Time

5:14handmade_debug.h: Add Duration and DurationOfChildren to debug_profile_node in order to separate out the clocks

6:06handmade_debug.cpp: Compute the DurationOfChildren and make the TopClocksList exclusive of the children

9:26"Clocks without children"^α

10:05Run the game and see a clearer picture of where our time is being spent

11:47handmade_world_mode.cpp: Make UpdateAndRenderWorld a TIMED_FUNCTION

12:42Run the game and see what takes the time

14:30handmade_debug_interface.h: Make RecordDebugEvent take Name rather than DEBUG_NAME

16:01handmade_world_mode.cpp: Insert some TIMED_BLOCKs in UpdateAndRenderWorld

17:24Run the game and see that GroundChunksOn takes up so much of the time

17:35handmade_world_mode.cpp: Nuke GroundChunksOn and consult the profiler again

20:34handmade_debug.cpp: Clip the profiler drawing to ProfileRect.Min.Y

26:47Blackboard: Picking the correct line to clip to

27:32handmade_debug.cpp: Make the profiler overdraw by one line

28:30View the profiler and see this overdrawing

32:17handmade_render_group.h and .cpp: Consider how to enable the bitmaps to be clipped

36:44Blackboard: Respecifying bitmaps

39:02handmade_render_group.h: Try to introduce render_entry_cliprect, to pass the clipping area down the stream

40:05handmade_opengl.cpp: Consider the problem with sorting

42:26handmade_render_group.h: Add ClipRect to render_entry_bitmap and ClipRectIndex to render_group_entry_header in order allow clipping while sorting

44:16handmade_opengl.cpp: Call glScissor¹

45:10handmade_platform.h: Add ClipRectCount and *ClipRects to game_render_commands

49:29handmade_render_group.h: Introduce game_render_clip_rect

52:21handmade_render_group.h: Set CurrentClipRectIndex for the entire window in Perspective

55:37handmade_render_group.cpp: Introduce PushClipRect

1:06:45win32_handmade.cpp: Make Win32DisplayBufferInWindow take ClipRectMemory and to call LinearizeClipRects

1:10:33handmade_render.cpp: Introduce LinearizeClipRects

1:16:27Run the game and hit an InvalidDefaultCase

1:18:59handmade_render_group.cpp: Guard against overflow in PushClipRect

1:22:30handmade_debug.cpp: Do a PushClipRect in DrawTopClocksList

1:25:06Debugger: Step into ClipRectIndex and inspect the values

1:26:05handmade_opengl.cpp: Enable GL_SCISSOR_TEST

1:26:35View our correctly clipping profiler

1:27:27handmade_opengl.cpp: Disable GL_SCISSOR_TEST in OpenGLDisplayBitmap

1:28:00handmade_render.cpp: Implement clipping in the software renderer

1:29:12Blackboard: Intersecting tiles

1:32:01View the profiler and see that it clips in both renderers

1:32:30Q&A

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1:32:30Q&A

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1:32:30Q&A

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1:34:11Popcorn0x90 What are top three reason for FPS to go down?

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1:34:11Popcorn0x90 What are top three reason for FPS to go down?

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1:34:11Popcorn0x90 What are top three reason for FPS to go down?

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1:34:36sonoftheright Will ClipRect be used outside of debug, and where?

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1:34:36sonoftheright Will ClipRect be used outside of debug, and where?

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1:34:36sonoftheright Will ClipRect be used outside of debug, and where?

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1:35:46fierydrake Can you elaborate on the ODE you plan to replace your drag function with in MoveEntity?

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1:35:46fierydrake Can you elaborate on the ODE you plan to replace your drag function with in MoveEntity?

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1:35:46fierydrake Can you elaborate on the ODE you plan to replace your drag function with in MoveEntity?

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1:36:00fyoucon How about making the toplist scrollable? Since we now clip it, can be painful when you start profiling a lot more

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1:36:00fyoucon How about making the toplist scrollable? Since we now clip it, can be painful when you start profiling a lot more

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1:36:00fyoucon How about making the toplist scrollable? Since we now clip it, can be painful when you start profiling a lot more

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1:36:50blah238 When does clipping overdrawn areas cost more than just drawing them?

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1:36:50blah238 When does clipping overdrawn areas cost more than just drawing them?

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1:36:50blah238 When does clipping overdrawn areas cost more than just drawing them?

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1:38:12sssmcgrath That's not entirely true, the state change on the clip isn't free, and if the size change is minor it's probably not worth it

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1:38:12sssmcgrath That's not entirely true, the state change on the clip isn't free, and if the size change is minor it's probably not worth it

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1:38:12sssmcgrath That's not entirely true, the state change on the clip isn't free, and if the size change is minor it's probably not worth it

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1:39:11Miblo When you switch between the renderers, the viewing frame time is (obviously) affected. Are the clocks in our newly clipped box also affected by the renderers, i.e. ordered / distributed differently?

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1:39:11Miblo When you switch between the renderers, the viewing frame time is (obviously) affected. Are the clocks in our newly clipped box also affected by the renderers, i.e. ordered / distributed differently?

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1:39:11Miblo When you switch between the renderers, the viewing frame time is (obviously) affected. Are the clocks in our newly clipped box also affected by the renderers, i.e. ordered / distributed differently?

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1:39:36build.bat: Switch to -O2 and -DHANDMADE_SLOW=0 and view the profile

1:40:59handmade_render.cpp: Ignore IGNORED_TIMED_FUNCTION and IGNORED_TIMED_BLOCK

1:45:05handmade_render.cpp: Ignore DrawRectangle and "Pixel Fill"

1:47:14longboolean What does OpenGL do when you enable gl_scissor_test? What is it testing for?

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1:47:14longboolean What does OpenGL do when you enable gl_scissor_test? What is it testing for?

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1:47:14longboolean What does OpenGL do when you enable gl_scissor_test? What is it testing for?

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1:47:35Blackboard: glScissor

1:48:22Wrap it up

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1:48:22Wrap it up

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1:48:22Wrap it up

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1:48:46build.bat: Switch back to -Od and -DHANDMADE_SLOW=1

1:48:50todo.txt: Update the TODO list

1:49:54Announce that the forums will be going down this weekend [note: actually the 22nd April]

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1:49:54Announce that the forums will be going down this weekend [note: actually the 22nd April]

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1:49:54Announce that the forums will be going down this weekend [note: actually the 22nd April]

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