[Differential] [Commented On] D2484: [Image Wallpaper] Avoid cross-fading which reveals black background behind images

[fredrik (Fredrik Höglund)]

fredrik added a comment.


  The correct way to fix this is to use a custom shader that does approximately this:
  
    uniform sampler2D texture1;
    uniform sampler2D texture2;
    uniform float fadeProgress;
    varying vec2 texcoord1;
    varying vec2 texcoord2;
    
    void main(void) {
        vec4 texel1 = texture2D(texture1, texcoord1);
        vec4 texel2 = texture2D(texture2, texcoord2);
        gl_FragColor = mix(texel1, texel2, fadeProgress);
    }
  
  As an added bonus you only render each pixel once, and you don't need blending to be enabled, so it's much faster. Especially on tiled renderers.

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REVISION DETAIL
  https://phabricator.kde.org/D2484

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To: broulik, #plasma, mart
Cc: fredrik, mart, plasma-devel, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas
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