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ebiten: update comments about Vertex

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Updates #2365
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Hajime Hoshi 2022-10-02 19:35:17 +09:00
parent 311aa7dcf8
commit 72004b2e23
1 changed files with 4 additions and 2 deletions
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image.go
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@ -262,10 +262,12 @@ type Vertex struct {
// ColorR/ColorG/ColorB/ColorA represents color scaling values. // ColorR/ColorG/ColorB/ColorA represents color scaling values.
// Their interpretation depends on the concrete draw call used: // Their interpretation depends on the concrete draw call used:
// - DrawTriangles: straight-alpha encoded color multiplier. // - DrawTriangles: straight-alpha or premultiplied-alpha encoded color multiplier.
// The format is determined by ColorScaleFormat in DrawTrianglesOptions.
// If ColorA is 0, the vertex is fully transparent and color is ignored. // If ColorA is 0, the vertex is fully transparent and color is ignored.
// If ColorA is 1, the vertex has the color (ColorR, ColorG, ColorB). // If ColorA is 1, the vertex has the color (ColorR, ColorG, ColorB).
// Vertex colors are interpolated linearly respecting alpha. // Vertex colors are converted to premultiplied-alpha internally and
// interpolated linearly respecting alpha.
// - DrawTrianglesShader: arbitrary floating point values sent to the shader. // - DrawTrianglesShader: arbitrary floating point values sent to the shader.
// These are interpolated linearly and independently from each other. // These are interpolated linearly and independently from each other.
ColorR float32 ColorR float32