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Spectre/Math: Adding Vector2UnProject()

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This commit is contained in:
Henrik Hautakoski 2023-08-21 07:05:34 +02:00
parent 813c0dab17
commit 416a71f744
2 changed files with 16 additions and 0 deletions
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5
include/Spectre/Math/Math.h
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@ -2,6 +2,8 @@
#ifndef SPECTRE_MATH_MATH_H
#define SPECTRE_MATH_MATH_H
#include "Transform.h"
#include "Vector4.h"
#include "Vector3.h"
#include "Vector2.h"
#include "Matrix4.h"
@ -32,6 +34,9 @@ namespace sp { namespace math
float bottom, float top,
float zNear = -1.0f, float zFar = 1.0f);
//
Vector2f Vector2UnProject(Vector2f point, Transform InverseMVP, Vector4u screen);
// Create a 2D rotation matrix. (rotation around Z-axis)
Matrix4f rotation(float theta);

11
source/Math/Math.cpp
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@ -1,5 +1,6 @@
#include <cstdlib>
#include <Spectre/Math/Transform.h>
#include <Spectre/Math/Math.h>
namespace sp { namespace math
@ -47,6 +48,16 @@ namespace sp { namespace math
);
}
Vector2f Vector2UnProject(Vector2f point, Transform InverseMVP, Vector4u screen) {
// Convert to NDC from pixel cordinates first using screen size
point.x = -1.f + 2.f * (point.x - screen.x) / screen.z;
point.y = 1.f - 2.f * (point.y - screen.y) / screen.w;
// Then transform the point using the inverse MVP matrix.
return InverseMVP.transformPoint(point);
}
Matrix4f rotation(float theta) {
float r = deg2rad(theta);