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#pragma once
#include <vector>
#include <utility>
#include <Magnum/GL/AbstractShaderProgram.h>
#include <Magnum/GL/Texture.h>
#include <Magnum/Math/Color.h>
#include <Magnum/Math/Vector2.h>
#include <Magnum/Math/Matrix4.h>
namespace Magnum::Examples {
struct tile_shader : GL::AbstractShaderProgram
{
typedef GL::Attribute<0, Vector3> Position;
typedef GL::Attribute<1, Vector2> TextureCoordinates;
explicit tile_shader();
Vector2 scale() const { return scale_; }
tile_shader& set_scale(const Vector2& scale);
Vector2 camera_offset() const { return camera_offset_; }
tile_shader& set_camera_offset(Vector2 camera_offset);
static inline Vector2 project(Vector3 pt);
private:
Vector2 scale_, camera_offset_;
enum { ScaleUniform = 0, OffsetUniform = 1, };
};
Vector2 tile_shader::project(Vector3 pt)
{
float x = pt[1], y = pt[0], z = pt[2];
return { x-y, (x+y+z*2)*.75f };
}
} // namespace Magnum::Examples
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