diff options
Diffstat (limited to 'src/quick/scenegraph/shaders/smoothcolor.vert')
-rw-r--r-- | src/quick/scenegraph/shaders/smoothcolor.vert | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/quick/scenegraph/shaders/smoothcolor.vert b/src/quick/scenegraph/shaders/smoothcolor.vert new file mode 100644 index 0000000000..df70fea92a --- /dev/null +++ b/src/quick/scenegraph/shaders/smoothcolor.vert @@ -0,0 +1,45 @@ +uniform highp vec2 pixelSize; +uniform highp mat4 matrix; +uniform lowp float opacity; + +attribute highp vec4 vertex; +attribute lowp vec4 vertexColor; +attribute highp vec2 vertexOffset; + +varying lowp vec4 color; + +void main() +{ + highp vec4 pos = matrix * vertex; + gl_Position = pos; + + if (vertexOffset.x != 0.) { + highp vec4 delta = matrix[0] * vertexOffset.x; + highp vec2 dir = delta.xy * pos.w - pos.xy * delta.w; + highp vec2 ndir = .5 * pixelSize * normalize(dir / pixelSize); + dir -= ndir * delta.w * pos.w; + highp float numerator = dot(dir, ndir * pos.w * pos.w); + highp float scale = 0.0; + if (numerator < 0.0) + scale = 1.0; + else + scale = min(1.0, numerator / dot(dir, dir)); + gl_Position += scale * delta; + } + + if (vertexOffset.y != 0.) { + highp vec4 delta = matrix[1] * vertexOffset.y; + highp vec2 dir = delta.xy * pos.w - pos.xy * delta.w; + highp vec2 ndir = .5 * pixelSize * normalize(dir / pixelSize); + dir -= ndir * delta.w * pos.w; + highp float numerator = dot(dir, ndir * pos.w * pos.w); + highp float scale = 0.0; + if (numerator < 0.0) + scale = 1.0; + else + scale = min(1.0, numerator / dot(dir, dir)); + gl_Position += scale * delta; + } + + color = vertexColor * opacity; +}
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