Port 17 effects to RHI, remove 8 unportable ones

The following are based on static shader code, and after porting the
shaders they will work fully identically to 5.15:

FastBlur
Colorize
OpacityMask
BrightnessContrast
ColorOverlay
Desaturate
Displace
GammaAdjust
HueSaturation
LevelAdjust
RectangularGlow
Thresholdmask
LinearGradient
RadialGradient
ConicalGradient

The following change behavior:

Glow
DropShadow

These now only have the fast variants, because those rely on static shader code.
So we are going back to the Qt 5.5 versions and make them behave as if 'fast'
was always set to true. The 'fast' and 'samples' properties are removed.

The following are removed:

Blend
GaussianBlur
DirectionalBlur
MaskedBlur
RadialBlur
RecursiveBlur
ZoomBlur
InnerShadow

The autotest and the gallery application (run qmlscene testBed.qml in
tests/manual/testbed) have been adjusted accordingly and now work across
all QRhi backends.

The docs may still refer to removed effects in some code snippets. Updating
that is left as a separate exercise.

[ChangeLog] Graphical Effects no longer relies on dynamically generated
shader strings. The following effects have been removed: Blend, GaussianBlur,
MaskedBlur, RadialBlur, RecursiveBlur, ZoomBlur, InnerShadow. Glow
and DropShadow always use the 'fast' variant. The fast and samples
properties for these are thus no longer applicable and have been
removed.

Change-Id: Ife83f3828f37977596fd34f8da8b61961f0ed28a
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

1 files changed, 0 insertions, 77 deletions

diff --git a/src/effects/shaders/huesaturation.frag b/src/effects/shaders/huesaturation.frag
deleted file mode 100644
index c6073be..0000000
--- a/src/effects/shaders/huesaturation.frag
+++ /dev/null
@@ -1,77 +0,0 @@
-varying highp vec2 qt_TexCoord0;
-uniform highp float qt_Opacity;
-uniform highp sampler2D source;
-uniform highp vec3 hsl;
-
-highp vec3 RGBtoHSL(highp vec3 color) {
-    highp float cmin = min(color.r, min(color.g, color.b));
-    highp float cmax = max(color.r, max(color.g, color.b));
-    highp float h = 0.0;
-    highp float s = 0.0;
-    highp float l = (cmin + cmax) / 2.0;
-    highp float diff = cmax - cmin;
-
-    if (diff > 1.0 / 256.0) {
-        if (l < 0.5)
-            s = diff / (cmin + cmax);
-        else
-            s = diff / (2.0 - (cmin + cmax));
-
-        if (color.r == cmax)
-            h = (color.g - color.b) / diff;
-        else if (color.g == cmax)
-            h = 2.0 + (color.b - color.r) / diff;
-        else
-            h = 4.0 + (color.r - color.g) / diff;
-
-        h /= 6.0;
-    }
-    return vec3(h, s, l);
-}
-
-highp float hueToIntensity(highp float v1, highp float v2, highp float h) {
-    h = fract(h);
-    if (h < 1.0 / 6.0)
-        return v1 + (v2 - v1) * 6.0 * h;
-    else if (h < 1.0 / 2.0)
-        return v2;
-    else if (h < 2.0 / 3.0)
-        return v1 + (v2 - v1) * 6.0 * (2.0 / 3.0 - h);
-
-    return v1;
-}
-
-highp vec3 HSLtoRGB(highp vec3 color) {
-    highp float h = color.x;
-    highp float l = color.z;
-    highp float s = color.y;
-
-    if (s < 1.0 / 256.0)
-        return vec3(l);
-
-    highp float v1;
-    highp float v2;
-    if (l < 0.5)
-        v2 = l * (1.0 + s);
-    else
-        v2 = (l + s) - (s * l);
-
-    v1 = 2.0 * l - v2;
-
-    highp float d = 1.0 / 3.0;
-    highp float r = hueToIntensity(v1, v2, h + d);
-    highp float g = hueToIntensity(v1, v2, h);
-    highp float b = hueToIntensity(v1, v2, h - d);
-    return vec3(r, g, b);
-}
-
-void main() {
-    lowp vec4 sample = texture2D(source, qt_TexCoord0);
-    sample = vec4(sample.rgb / max(1.0/256.0, sample.a), sample.a);
-    sample.rgb = mix(vec3(dot(sample.rgb, vec3(0.2125, 0.7154, 0.0721))), sample.rgb, 1.0 + hsl.y);
-    sample.xyz = RGBtoHSL(sample.rgb);
-    sample.rgb = HSLtoRGB(vec3(sample.x + hsl.x, sample.y, sample.z));
-    highp float c = step(0.0, hsl.z);
-    sample.rgb = mix(sample.rgb, vec3(c), abs(hsl.z));
-    gl_FragColor = vec4(sample.rgb * sample.a, sample.a) * qt_Opacity;
-}