Create a new internal/colormshader package that owns the color matrix
shader generation, fully independent of internal/builtinshader. It has
its own shader template with ColorM logic baked in, its own
Filter/Address types, and a go:generate pipeline producing defs.go.
This removes the useColorM dimension from internal/builtinshader,
reducing it from 18 shader variants to 9. The colorm package now
imports only colormshader (not builtinshader) for shader sources,
preparing for the v2/v3 split where v2's colorm cannot access v3's
builtinshader.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Create a new internal/colormshader package that owns the color matrix
shader generation, fully independent of internal/builtinshader. It has
its own shader template with ColorM logic baked in, its own
Filter/Address types, and a go:generate pipeline producing defs.go.
This removes the useColorM dimension from internal/builtinshader,
reducing it from 18 shader variants to 9. The colorm package now
imports only colormshader (not builtinshader) for shader sources,
preparing for the v2/v3 split where v2's colorm cannot access v3's
builtinshader.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This replaces the built-in shaders with Kage shadres. This is a
refactoring and doesn't degrade performance:
```
go test -bench=^BenchmarkColorMScale$ -run=^$ . -count=5
```
```
name old time/op new time/op delta
ColorMScale-8 978ns ±15% 1184ns ±46% ~ (p=0.413 n=4+5)
```
A follow-up change to remove the built-in shaders is needed.
Closes#2364
With DirectX, the graphics driver cannot be determined until the
main loop starts, as a transparent window cannot be treated with
DirectX so far. On the other hand, compiling shaders requires a
graphics driver as it requires information about Y directions of
NDCs and framebuffers.
This change delays compiling shaders until the graphics commands
are actually executed in the main loop.
Updates #1007
Updates #2019
Instead of using a negative height in the viewport, invert the Y direction
at the vertex shader. This is a little more readable as a negative height
is hacky.
This is a preparation for DirectX 12. DirectX 12's coodination system
is very similar to Metal, but doesn't treat a negative height in its
viewport unfortunately.
Updates #1007
Hajime Hoshi