2017-12-06 22:26:13 +00:00
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[video member=cmuratori stream_platform=twitch stream_username=handmade_hero project=code title="Basic Linear Bitmap Blending" vod_platform=youtube id=ydiHNs1YQoI annotator=schme annotator=effect0r annotator=theinternetftw]
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[0:00:00][Prestream stuff]
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[0:09:18][Intro and welcome]
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[0:10:52][Where we left of from last time]
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[0:11:17][Fixing the hero's color]
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[0:16:16][Figuring out what the shift values are]
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[0:18:48][Bitscanforward]
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[0:27:53][Renaming bitscanforward to FindLeastSignificantSetBit]
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[0:29:36][The intrinsics thing]
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[0:30:16][Finding out what compiler we're on]
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[0:31:27][Making a comprimise: Allowing the intrinsics file access to the platform layer]
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[0:33:20][Determining what compiler is being used]
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[0:41:20][Simple version of using the alpha channel]
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[0:45:20][Alpha as an opacity value]
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[0:46:36][Implementing 0-128 off, 129 onwards on for alpha]
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[0:49:20][The dumb, slow way to do alpha blending.]
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[0:50:04][Krita crashes..]
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[0:50:47][Blackboard session explaining alpha blending using the background value]
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[0:51:01]['Deriving' the formula for a linear blend]
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[0:58:02][The cannonical form of a linear blend]
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[0:58:45][How the 't' works in the linear blend formula]
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[1:00:35][Implementing the floating point version of linear blend]
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[1:06:55][Drawing the herohead at the location of the player]
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2018-03-07 21:48:09 +00:00
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[1:07:23][Q&A][:speech]
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2017-12-06 22:26:13 +00:00
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[1:08:06][Stream spots a typo!]
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[1:08:37][Stream suggests to assert the bitmap assertion mode!]
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[1:09:12][You do not need #pragma intrinsic if you include <intrin.h>]
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[1:10:53][Would it be worthwhile to avoid converting to float while doing the alpha blend?]
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[1:12:46][Why is the Windows-logo still visible at the top?]
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[1:14:11][Are there other ways to alpha blend and should you be taking into account which colors are easier to see?]
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[1:21:06][Are we at all concerned with the destinations alpha?]
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[1:25:28][Will the final blend favor the source over the destination, or is linear good enough?]
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[1:25:59][How would you deal with other picture formats such as png, jpeg, etc.]
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[1:26:53][Why is the mask so complicated to use?]
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[1:27:51][Did you mean the other compiler LLVM or Clang?]
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[1:28:37][In the bitscan function what about returning index negative one if not found?]
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[1:29:04][Can you go over the linear alpha blend diagram again?]
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[1:34:36][Is the large VirtualAlloc() at the beginning similar to Linux mmap()?]
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[1:35:51][What bitvalue is 50% brightness?]
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[1:37:34][Does the display bitmap operation actually do anything with the alpha channel?]
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[1:37:58][The solid curve on Wikipedias gamma correction is the linear space intensity. Should be what you're looking for.]
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[/video]
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