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#version 440
layout(location = 0) in vec4 vertex;
layout(location = 1) in vec4 vertexColor;
layout(location = 2) in vec4 vertexOffset;
layout(location = 0) out vec4 color;
layout(std140, binding = 0) uniform buf {
mat4 matrix;
vec2 pixelSize;
float opacity;
} ubuf;
out gl_PerVertex { vec4 gl_Position; };
void main()
{
vec4 pos = ubuf.matrix * vertex;
gl_Position = pos;
if (vertexOffset.x != 0.) {
vec4 delta = ubuf.matrix[0] * vertexOffset.x;
vec2 dir = delta.xy * pos.w - pos.xy * delta.w;
vec2 ndir = .5 * ubuf.pixelSize * normalize(dir / ubuf.pixelSize);
dir -= ndir * delta.w * pos.w;
float numerator = dot(dir, ndir * pos.w * pos.w);
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.) {
vec4 delta = ubuf.matrix[1] * vertexOffset.y;
vec2 dir = delta.xy * pos.w - pos.xy * delta.w;
vec2 ndir = .5 * ubuf.pixelSize * normalize(dir / ubuf.pixelSize);
dir -= ndir * delta.w * pos.w;
float numerator = dot(dir, ndir * pos.w * pos.w);
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 * ubuf.opacity;
}
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