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[Impeller] combine text shaders.#52392

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jonahwilliams:combine_text_shaders
Apr 25, 2024
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[Impeller] combine text shaders.#52392
auto-submit[bot] merged 9 commits intoflutter:mainfrom
jonahwilliams:combine_text_shaders

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@jonahwilliams jonahwilliams commented Apr 25, 2024 •
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Combine both text shaders into one. One more down!

flutter/flutter#143540

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jonahwilliams commented Apr 25, 2024

Version 1:

Changes found in shader flutter/impeller/entity/gles/glyph_atlas.frag.gles on core Mali-G78:
has_uniform_computation:
  False <- before
  True <- after
longest_path_cycles in variant Main
        arith_total arith_fma   arith_cvt   arith_sfu   load_store  varying     texture     bound       
before  0.031250    0.031250    0.031250    0.000000    0.000000    0.500000    0.250000    varying
after   0.109375    0.031250    0.109375    0.000000    0.000000    0.250000    0.250000    varying,texture

shortest_path_cycles in variant Main
        arith_total arith_fma   arith_cvt   arith_sfu   load_store  varying     texture     bound       
before  0.031250    0.031250    0.000000    0.000000    0.000000    0.500000    0.250000    varying
after   0.062500    0.031250    0.062500    0.000000    0.000000    0.250000    0.250000    varying,texture

total_cycles in variant Main
        arith_total arith_fma   arith_cvt   arith_sfu   load_store  varying     texture     bound       
before  0.031250    0.031250    0.031250    0.000000    0.000000    0.500000    0.250000    varying
after   0.125000    0.062500    0.125000    0.000000    0.000000    0.250000    0.250000    varying,texture

In variant Main:
  uniform_registers_used: 4 <- before
  uniform_registers_used: 6 <- after

@jonahwilliams jonahwilliams marked this pull request as ready for review April 25, 2024 19:28
jonahwilliams
jonahwilliams commented Apr 25, 2024
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impeller/entity/shaders/glyph_atlas.frag
if (use_alpha_color_channel == 1.0) {
frag_color = value.aaaa * v_text_color;

if (frag_info.is_color_glyph == 1.0) {
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I looked at using mix(...) but malioc said it was more expensive.

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@chinmaygarde chinmaygarde Apr 25, 2024

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lol, that was my go-to trick for reducing branches. Glad to know thats obsolete.

jonahwilliams
jonahwilliams commented Apr 25, 2024
View reviewed changes
impeller/entity/contents/text_contents.cc

for (const Point& point : unit_points) {
vtx.unit_position = point;
std::memcpy(vtx_contents++, &vtx, sizeof(VS::PerVertexData));
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I don't know why I wrote this with memcpy

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I do it when I'm not sure about data alignment. But thats not a concern here.

chinmaygarde
chinmaygarde approved these changes Apr 25, 2024
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I usually don't pay too much attention to uniform computation. Its the register spills.

impeller/entity/contents/text_contents.cc

for (const Point& point : unit_points) {
vtx.unit_position = point;
std::memcpy(vtx_contents++, &vtx, sizeof(VS::PerVertexData));
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I do it when I'm not sure about data alignment. But thats not a concern here.

@jonahwilliams jonahwilliams added the autosubmit Merge PR when tree becomes green via auto submit App label Apr 25, 2024
@auto-submit auto-submit bot merged commit a09295f into flutter:main Apr 25, 2024
@jonahwilliams jonahwilliams deleted the combine_text_shaders branch April 25, 2024 20:18
@engine-flutter-autoroll engine-flutter-autoroll mentioned this pull request Apr 25, 2024
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engine-flutter-autoroll added a commit to engine-flutter-autoroll/flutter that referenced this pull request Apr 25, 2024
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a09295f [Impeller] combine text shaders. (flutter/engine#52392)
8f51fb8
jmagman pushed a commit to flutter/flutter that referenced this pull request Apr 25, 2024
@engine-flutter-autoroll
Roll Flutter Engine from 3768ca0 to a09295f (1 revision) (#147386)
014cf33 
flutter/engine@3768ca0...a09295f

2024-04-25 [email protected] [Impeller] combine text shaders.
(flutter/engine#52392)

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using the controls here:
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@chinmaygarde chinmaygarde chinmaygarde approved these changes

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