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#version 150 core
in vec4 vertexCoord;
in vec4 vertexColor;
uniform mat4 matrix;
uniform vec2 gradStart;
uniform vec2 gradEnd;
out float gradTabIndex;
void main()
{
vec2 gradVec = gradEnd - gradStart;
gradTabIndex = dot(gradVec, vertexCoord.xy - gradStart) / (gradVec.x * gradVec.x + gradVec.y * gradVec.y);
gl_Position = matrix * vertexCoord;
}
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