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SHADER_SOURCE(gDrawLinearGradientVertexShader,
attribute vec4 position;
uniform mat4 transform;
uniform float gradientLength;
uniform vec2 gradient;
uniform vec2 start;
uniform mat4 screenSpace;
varying float index;
void main(void) {
vec4 location = screenSpace * position;
index = dot(location.xy - start, gradient) * gradientLength;
gl_Position = transform * position;
}
);
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