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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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