1 files changed, 28 insertions, 0 deletions
diff --git a/src/effects/shaders/fastglow.frag b/src/effects/shaders/fastglow.frag
new file mode 100644
index 0000000..0eb3ece
--- /dev/null
+++ b/src/effects/shaders/fastglow.frag
@@ -0,0 +1,28 @@
+uniform lowp sampler2D source1;
+uniform lowp sampler2D source2;
+uniform lowp sampler2D source3;
+uniform lowp sampler2D source4;
+uniform lowp sampler2D source5;
+uniform mediump float weight1;
+uniform mediump float weight2;
+uniform mediump float weight3;
+uniform mediump float weight4;
+uniform mediump float weight5;
+uniform highp vec4 color;
+uniform highp float spread;
+uniform lowp float qt_Opacity;
+varying mediump vec2 qt_TexCoord0;
+
+highp float linearstep(highp float e0, highp float e1, highp float x) {
+    return clamp((x - e0) / (e1 - e0), 0.0, 1.0);
+}
+
+void main() {
+    lowp vec4 sourceColor = texture2D(source1, qt_TexCoord0) * weight1;
+    sourceColor += texture2D(source2, qt_TexCoord0) * weight2;
+    sourceColor += texture2D(source3, qt_TexCoord0) * weight3;
+    sourceColor += texture2D(source4, qt_TexCoord0) * weight4;
+    sourceColor += texture2D(source5, qt_TexCoord0) * weight5;
+    sourceColor = mix(vec4(0), color, linearstep(0.0, spread, sourceColor.a));
+    gl_FragColor = sourceColor * qt_Opacity;
+}