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#version 110
uniform float timer;
attribute vec4 position;
varying vec2 texcoord;
varying float fade_factor;
mat4 view_frustum(
float angle_of_view,
float aspect_ratio,
float z_near,
float z_far
) {
return mat4(
vec4(1.0/tan(angle_of_view), 0.0, 0.0, 0.0),
vec4(0.0, aspect_ratio/tan(angle_of_view), 0.0, 0.0),
vec4(0.0, 0.0, (z_far+z_near)/(z_far-z_near), 1.0),
vec4(0.0, 0.0, -2.0*z_far*z_near/(z_far-z_near), 0.0)
);
}
mat4 scale(float x, float y, float z)
{
return mat4(
vec4(x, 0.0, 0.0, 0.0),
vec4(0.0, y, 0.0, 0.0),
vec4(0.0, 0.0, z, 0.0),
vec4(0.0, 0.0, 0.0, 1.0)
);
}
mat4 translate(float x, float y, float z)
{
return mat4(
vec4(1.0, 0.0, 0.0, 0.0),
vec4(0.0, 1.0, 0.0, 0.0),
vec4(0.0, 0.0, 1.0, 0.0),
vec4(x, y, z, 1.0)
);
}
mat4 rotate_x(float theta)
{
return mat4(
vec4(1.0, 0.0, 0.0, 0.0),
vec4(0.0, cos(theta), sin(theta), 0.0),
vec4(0.0, -sin(theta), cos(theta), 0.0),
vec4(0.0, 0.0, 0.0, 1.0)
);
}
void main()
{
gl_Position = view_frustum(radians(45.0), 4.0/3.0, 0.5, 5.0)
* translate(cos(timer), 0.0, 3.0+sin(timer))
* rotate_x(timer)
* scale(4.0/3.0, 1.0, 1.0)
* position;
texcoord = position.xy * vec2(0.5) + vec2(0.5);
fade_factor = sin(timer) * 0.5 + 0.5;
}