diff options
Diffstat (limited to 'examples/quick/shadereffects/content/shaders/outline.frag')
-rw-r--r-- | examples/quick/shadereffects/content/shaders/outline.frag | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/examples/quick/shadereffects/content/shaders/outline.frag b/examples/quick/shadereffects/content/shaders/outline.frag new file mode 100644 index 0000000000..9b46719873 --- /dev/null +++ b/examples/quick/shadereffects/content/shaders/outline.frag @@ -0,0 +1,16 @@ +uniform sampler2D source; +uniform highp vec2 delta; +uniform highp float qt_Opacity; + +varying highp vec2 qt_TexCoord0; + +void main() { + lowp vec4 tl = texture2D(source, qt_TexCoord0 - delta); + lowp vec4 tr = texture2D(source, qt_TexCoord0 + vec2(delta.x, -delta.y)); + lowp vec4 bl = texture2D(source, qt_TexCoord0 - vec2(delta.x, -delta.y)); + lowp vec4 br = texture2D(source, qt_TexCoord0 + delta); + mediump vec4 gx = (tl + bl) - (tr + br); + mediump vec4 gy = (tl + tr) - (bl + br); + gl_FragColor.xyz = vec3(0.); + gl_FragColor.w = clamp(dot(sqrt(gx * gx + gy * gy), vec4(1.)), 0., 1.) * qt_Opacity; +} |