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/usr/src/castle-game-engine-5.0.0/opengl/glsl/rectangle.vs is in castle-game-engine-src 5.0.0-3.

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The actual contents of the file can be viewed below.

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attribute vec2 vertex;
uniform vec2 viewport_size;

/* Simple GLSL shader to draw 2D rectangle. */

void main(void)
{
  gl_Position = vec4(vertex * 2.0 / viewport_size - vec2(1.0), 0.0, 1.0);
}