How to use shader to realize the photo album of gradual transition in android
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Effect:
Realization idea
Split the function points, there are mainly two: one is to achieve the gradual change of the picture, and the other is to achieve the switching of the picture.
The gradual change of the picture can be understood as the change of the transparency of the local pixels in a certain direction over time. The effect achieved in demo is a horizontal roller switch. The mathematical realization of horizontal translation is actually a simple vertical line x = time about the change of time. We only need to compare the x coordinate of each pixel with this vertical line, setting the transparency to 0 on the left and 1 on the right, and then smooth sampling to have the effect of gradual transition:
Void main () {
Vec4 color = vec4 (1,1,1,1)
Color * = texture (texture, v_uv0)
Color * = v_color
# if USE_TRAMSFORM
Color.a = smoothstep (0.0, u_fade_radius, u_fade_radius + v_uv0.x-u_time)
# endif
Gl_FragColor = color
}
The gradual change of the picture is realized, and then there is the switching of the picture. All the pictures are actually in a queue. After the gradual change is completed, we only need to put the top picture at the bottom, so that this photo album can be played in a loop all the time. In this process, we add some picture state processing to achieve the effect of the gradient album in demo.
IsTransforming: boolean = false
BgTramsform () {
If (this.isTransforming) return
This.isTransforming = true
Let time = 0.0
Let node = this.switchNodeList [0]
Let material = node.getComponent (cc.Sprite) .getMaterial (0)
Material.setProperty ('ubiquitous radiating, this.fadeRadius)
Material.setProperty ('upright timekeeping, time)
Material.define ('USE_TRAMSFORM', true, 0, true)
Let timer = setInterval () = > {
Time + = 0.03
Material.setProperty ('upright timekeeping, time)
If (time > 1.0 + this.fadeRadius) {
This.switchNodeList.shift ()
This.switchNodeList.push (node)
This.switchNodeList.forEach ((node, idx) = > node.zIndex = this.switchNodeList.length-idx)
Material.define ('USE_TRAMSFORM', false, 0, true)
This.isTransforming = false
Timer & & clearInterval (timer)
}
}, 30)
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