26 lines
838 B
C++
26 lines
838 B
C++
#pragma once
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// camera_2d — pure orthographic 2D camera (issue 0072b).
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// No state, no I/O. World <-> screen transforms + ortho view-projection matrix.
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#include "../core/math2d.h"
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namespace fn::cam {
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struct Camera2D {
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fn::math2d::Vec2 pos = {0.0f, 0.0f}; // world position of camera center
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float zoom = 1.0f; // 1 = no zoom; >1 zoom in
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float rotation = 0.0f; // radians
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int viewport_w = 1280;
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int viewport_h = 720;
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};
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fn::math2d::Vec2 world_to_screen(const Camera2D& c, fn::math2d::Vec2 world);
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fn::math2d::Vec2 screen_to_world(const Camera2D& c, fn::math2d::Vec2 screen);
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fn::math2d::Rect visible_world_rect(const Camera2D& c);
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// Column-major 4x4 view-projection matrix (orthographic).
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void view_proj_matrix(const Camera2D& c, float out[16]);
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} // namespace fn::cam
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