From de9909df038d1b6bb47bcc82fea5f8dc9dec2491 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Tue, 28 Dec 2021 15:42:50 +0000
Subject: Initial implementation for being able to click in the main window to
 select something

---
 gfx/gl/camera.cpp | 7 +++++++
 gfx/gl/camera.h   | 1 +
 2 files changed, 8 insertions(+)

(limited to 'gfx/gl')

diff --git a/gfx/gl/camera.cpp b/gfx/gl/camera.cpp
index 5a90d84..905f78e 100644
--- a/gfx/gl/camera.cpp
+++ b/gfx/gl/camera.cpp
@@ -12,3 +12,10 @@ Camera::GetViewProjection() const
 {
 	return projection * glm::lookAt(pos, pos + forward, up);
 }
+
+glm::vec3
+Camera::unProject(const glm::vec2 & mouse) const
+{
+	static constexpr const glm::vec4 screen {0, 0, 1, 1};
+	return glm::normalize(glm::unProject(mouse ^ 1, glm::lookAt(::origin, forward, up), projection, screen));
+}
diff --git a/gfx/gl/camera.h b/gfx/gl/camera.h
index 72f699d..1d3f5b3 100644
--- a/gfx/gl/camera.h
+++ b/gfx/gl/camera.h
@@ -8,6 +8,7 @@ public:
 	Camera(glm::vec3 pos, float fov, float aspect, float zNear, float zFar);
 
 	[[nodiscard]] glm::mat4 GetViewProjection() const;
+	[[nodiscard]] glm::vec3 unProject(const glm::vec2 &) const;
 
 	glm::vec3 pos;
 	glm::vec3 forward;
-- 
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