66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
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#include "Viewport.h"
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#include "Rectangle.h"
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#include "Vector3.h"
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#include "Matrix.h"
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#include "../Types/String.h"
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Viewport::Viewport(const Rectangle& bounds)
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: X(bounds.Location.X)
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, Y(bounds.Location.Y)
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, Width(bounds.Size.X)
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, Height(bounds.Size.Y)
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, MinDepth(0.0f)
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, MaxDepth(1.0f)
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{
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}
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String Viewport::ToString() const
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{
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return String::Format(TEXT("{}"), *this);
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}
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Rectangle Viewport::GetBounds() const
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{
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return Rectangle(X, Y, Width, Height);
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}
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void Viewport::SetBounds(const Rectangle& bounds)
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{
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X = bounds.Location.X;
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Y = bounds.Location.Y;
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Width = bounds.Size.X;
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Height = bounds.Size.Y;
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}
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void Viewport::Project(const Vector3& source, const Matrix& vp, Vector3& result) const
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{
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Vector3::Transform(source, vp, result);
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const float a = source.X * vp.M14 + source.Y * vp.M24 + source.Z * vp.M34 + vp.M44;
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if (!Math::IsOne(a))
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{
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result /= a;
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}
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result.X = (result.X + 1.0f) * 0.5f * Width + X;
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result.Y = (-result.Y + 1.0f) * 0.5f * Height + Y;
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result.Z = result.Z * (MaxDepth - MinDepth) + MinDepth;
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}
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void Viewport::Unproject(const Vector3& source, const Matrix& ivp, Vector3& result) const
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{
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result.X = (source.X - X) / Width * 2.0f - 1.0f;
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result.Y = -((source.Y - Y) / Height * 2.0f - 1.0f);
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result.Z = (source.Z - MinDepth) / (MaxDepth - MinDepth);
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const float a = result.X * ivp.M14 + result.Y * ivp.M24 + result.Z * ivp.M34 + ivp.M44;
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Vector3::Transform(result, ivp, result);
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if (!Math::IsOne(a))
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{
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result /= a;
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}
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}
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