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internal/atlas: move the color scaling from internal/atlas to ebiten
Updates #1820
This commit is contained in:
Hajime Hoshi
parent
5c7917897c
commit
0c6362c93a
58
image.go
58
image.go
@ -179,12 +179,13 @@ func (i *Image) DrawImage(img *Image, options *DrawImageOptions) {
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sy0 := float32(bounds.Min.Y)
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sx1 := float32(bounds.Max.X)
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sy1 := float32(bounds.Max.Y)
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vs := graphics.QuadVertices(sx0, sy0, sx1, sy1, a, b, c, d, tx, ty, 1, 1, 1, 1)
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colorm, cr, cg, cb, ca := colorMToScale(options.ColorM.affineColorM())
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vs := graphics.QuadVertices(sx0, sy0, sx1, sy1, a, b, c, d, tx, ty, cr, cg, cb, ca)
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is := graphics.QuadIndices()
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srcs := [graphics.ShaderImageNum]*ui.Image{img.image}
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i.image.DrawTriangles(srcs, vs, is, options.ColorM.affineColorM(), mode, filter, graphicsdriver.AddressUnsafe, dstRegion, graphicsdriver.Region{}, [graphics.ShaderImageNum - 1][2]float32{}, nil, nil, false, canSkipMipmap(options.GeoM, filter))
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i.image.DrawTriangles(srcs, vs, is, colorm, mode, filter, graphicsdriver.AddressUnsafe, dstRegion, graphicsdriver.Region{}, [graphics.ShaderImageNum - 1][2]float32{}, nil, nil, false, canSkipMipmap(options.GeoM, filter))
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}
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// Vertex represents a vertex passed to DrawTriangles.
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@ -332,23 +333,25 @@ func (i *Image) DrawTriangles(vertices []Vertex, indices []uint16, img *Image, o
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filter := graphicsdriver.Filter(options.Filter)
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colorm, cr, cg, cb, ca := colorMToScale(options.ColorM.affineColorM())
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vs := graphics.Vertices(len(vertices))
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for i, v := range vertices {
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vs[i*graphics.VertexFloatNum] = v.DstX
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vs[i*graphics.VertexFloatNum+1] = v.DstY
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vs[i*graphics.VertexFloatNum+2] = v.SrcX
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vs[i*graphics.VertexFloatNum+3] = v.SrcY
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vs[i*graphics.VertexFloatNum+4] = v.ColorR
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vs[i*graphics.VertexFloatNum+5] = v.ColorG
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vs[i*graphics.VertexFloatNum+6] = v.ColorB
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vs[i*graphics.VertexFloatNum+7] = v.ColorA
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vs[i*graphics.VertexFloatNum+4] = v.ColorR * cr
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vs[i*graphics.VertexFloatNum+5] = v.ColorG * cg
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vs[i*graphics.VertexFloatNum+6] = v.ColorB * cb
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vs[i*graphics.VertexFloatNum+7] = v.ColorA * ca
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}
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is := make([]uint16, len(indices))
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copy(is, indices)
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srcs := [graphics.ShaderImageNum]*ui.Image{img.image}
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i.image.DrawTriangles(srcs, vs, is, options.ColorM.affineColorM(), mode, filter, address, dstRegion, sr, [graphics.ShaderImageNum - 1][2]float32{}, nil, nil, options.FillRule == EvenOdd, false)
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i.image.DrawTriangles(srcs, vs, is, colorm, mode, filter, address, dstRegion, sr, [graphics.ShaderImageNum - 1][2]float32{}, nil, nil, options.FillRule == EvenOdd, false)
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}
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// DrawTrianglesShaderOptions represents options for DrawTrianglesShader.
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@ -828,3 +831,44 @@ func NewImageFromImage(source image.Image) *Image {
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i.ReplacePixels(imageToBytes(source))
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return i
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}
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// colorMToScale returns a new color matrix and color sclaes that equal to the given matrix in terms of the effect.
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//
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// If the given matrix is merely a scaling matrix, colorMToScale returns
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// an identity matrix and its scaling factors. This is useful to optimize
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// the rendering speed by avoiding the use of the color matrix and instead
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// multiplying all vertex colors by the scale.
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//
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// NOTE: this is only safe when not using a custom Kage shader,
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// as custom shaders may be using vertex colors for different purposes
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// than colorization. However, currently there are no Ebiten APIs that
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// support both shaders and color matrices.
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func colorMToScale(colorm affine.ColorM) (newColorM affine.ColorM, r, g, b, a float32) {
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if colorm.IsIdentity() {
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return colorm, 1, 1, 1, 1
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}
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if !colorm.ScaleOnly() {
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return colorm, 1, 1, 1, 1
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}
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r = colorm.At(0, 0)
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g = colorm.At(1, 1)
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b = colorm.At(2, 2)
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a = colorm.At(3, 3)
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// Color matrices work on non-premultiplied colors.
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// This color matrix can only make colors darker or equal,
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// and thus can never invoke color clamping.
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// Thus the simpler vertex color scale based shader can be used.
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//
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// Negative color values can become positive and out-of-range
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// after applying to vertex colors below, which can make the min() in the shader kick in.
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//
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// Alpha values smaller than 0, combined with negative vertex colors,
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// can also make the min() kick in, so that shall be ruled out too.
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if r < 0 || g < 0 || b < 0 || a < 0 || r > 1 || g > 1 || b > 1 {
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return colorm, 1, 1, 1, 1
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}
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return affine.ColorMIdentity{}, r, g, b, a
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}
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@ -420,40 +420,6 @@ func (i *Image) drawTriangles(srcs [graphics.ShaderImageNum]*Image, vertices []f
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i.processSrc(src)
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}
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// If a color matrix is used, but the matrix is merely a scaling matrix,
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// and the scaling cannot cause out-of-range colors, do not use a color matrix
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// when rendering but instead multiply all vertex colors by the scale.
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// This speeds up rendering.
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//
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// NOTE: this is only safe when not using a custom Kage shader,
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// as custom shaders may be using vertex colors for different purposes
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// than colorization. However, currently there are no Ebiten APIs that
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// support both shaders and color matrices.
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cr := float32(1)
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cg := float32(1)
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cb := float32(1)
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ca := float32(1)
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if !colorm.IsIdentity() && colorm.ScaleOnly() {
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r := colorm.At(0, 0)
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g := colorm.At(1, 1)
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b := colorm.At(2, 2)
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a := colorm.At(3, 3)
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if r >= 0 && g >= 0 && b >= 0 && a >= 0 && r <= 1 && g <= 1 && b <= 1 {
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// Color matrices work on non-premultiplied colors.
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// This color matrix can only make colors darker or equal,
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// and thus can never invoke color clamping.
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// Thus the simpler vertex color scale based shader can be used.
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//
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// Negative color values can become positive and out-of-range
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// after applying to vertex colors below, which can make the min() in the shader kick in.
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//
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// Alpha values smaller than 0, combined with negative vertex colors,
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// can also make the min() kick in, so that shall be ruled out too.
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cr, cg, cb, ca = r, g, b, a
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colorm = affine.ColorMIdentity{}
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}
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}
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var dx, dy float32
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// A screen image doesn't have its padding.
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if !i.screen {
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@ -477,10 +443,6 @@ func (i *Image) drawTriangles(srcs [graphics.ShaderImageNum]*Image, vertices []f
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vertices[i+1] += dy
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vertices[i+2] += oxf
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vertices[i+3] += oyf
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vertices[i+4] *= cr
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vertices[i+5] *= cg
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vertices[i+6] *= cb
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vertices[i+7] *= ca
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}
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// srcRegion can be delibarately empty when this is not needed in order to avoid unexpected
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// performance issue (#1293).
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@ -493,10 +455,6 @@ func (i *Image) drawTriangles(srcs [graphics.ShaderImageNum]*Image, vertices []f
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for i := 0; i < n; i += graphics.VertexFloatNum {
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vertices[i] += dx
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vertices[i+1] += dy
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vertices[i+4] *= cr
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vertices[i+5] *= cg
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vertices[i+6] *= cb
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vertices[i+7] *= ca
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}
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}
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