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all: add a compiler directive kage:unit

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This change adds a new compiler directive 'kage:unit' to Kage. This
takes one of these two values: 'pixel' and 'texel'. The default value
is 'texel'.

With the pixel-unit mode, all the built-in functions treats pixels
instead of texels, and the texCoord argument of Fragment is in pixels.
This simplifies shader programs as programs no longer have the notion
of texels.

With the texel-unit mode, the behavior is the same as the current
behavior.

Closes #1431
This commit is contained in:
Hajime Hoshi
2023-04-16 18:56:14 +09:00
parent b5ca404c42
commit 49582519c1
31 changed files with 544 additions and 206 deletions
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16
internal/graphicscommand/image_test.go
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@@ -41,14 +41,12 @@ func TestMain(m *testing.M) {
etesting.MainWithRunLoop(m)
}
func quadVertices(srcImage *graphicscommand.Image, w, h float32) []float32 {
sw, sh := srcImage.InternalSize()
swf, shf := float32(sw), float32(sh)
func quadVertices(w, h float32) []float32 {
return []float32{
0, 0, 0, 0, 1, 1, 1, 1,
w, 0, w / swf, 0, 1, 1, 1, 1,
0, w, 0, h / shf, 1, 1, 1, 1,
w, h, w / swf, h / shf, 1, 1, 1, 1,
w, 0, w, 0, 1, 1, 1, 1,
0, w, 0, h, 1, 1, 1, 1,
w, h, w, h, 1, 1, 1, 1,
}
}
@@ -57,7 +55,7 @@ func TestClear(t *testing.T) {
src := graphicscommand.NewImage(w/2, h/2, false)
dst := graphicscommand.NewImage(w, h, false)
vs := quadVertices(src, w/2, h/2)
vs := quadVertices(w/2, h/2)
is := graphics.QuadIndices()
dr := graphicsdriver.Region{
X: 0,
@@ -88,7 +86,7 @@ func TestWritePixelsPartAfterDrawTriangles(t *testing.T) {
clr := graphicscommand.NewImage(w, h, false)
src := graphicscommand.NewImage(w/2, h/2, false)
dst := graphicscommand.NewImage(w, h, false)
vs := quadVertices(src, w/2, h/2)
vs := quadVertices(w/2, h/2)
is := graphics.QuadIndices()
dr := graphicsdriver.Region{
X: 0,
@@ -107,7 +105,7 @@ func TestShader(t *testing.T) {
const w, h = 16, 16
clr := graphicscommand.NewImage(w, h, false)
dst := graphicscommand.NewImage(w, h, false)
vs := quadVertices(clr, w, h)
vs := quadVertices(w, h)
is := graphics.QuadIndices()
dr := graphicsdriver.Region{
X: 0,