From 5e022ee1ea94812b3446cac76e4f9ff9f3856d8c Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 23 Apr 2023 21:26:32 +0100
Subject: Add BufferedLocation

Wraps Location, storing a pre-computed mat4 transformation of the position/rotation in a VBO
handled by InstanceVertices.
---
 gfx/gl/bufferedLocation.cpp | 77 +++++++++++++++++++++++++++++++++++++++++++++
 gfx/gl/bufferedLocation.h   | 30 ++++++++++++++++++
 2 files changed, 107 insertions(+)
 create mode 100644 gfx/gl/bufferedLocation.cpp
 create mode 100644 gfx/gl/bufferedLocation.h

(limited to 'gfx')

diff --git a/gfx/gl/bufferedLocation.cpp b/gfx/gl/bufferedLocation.cpp
new file mode 100644
index 0000000..4484053
--- /dev/null
+++ b/gfx/gl/bufferedLocation.cpp
@@ -0,0 +1,77 @@
+#include "bufferedLocation.h"
+#include "location.hpp"
+#include "maths.h"
+#include <glm/gtx/transform.hpp>
+
+BufferedLocation::BufferedLocation(InstanceVertices<glm::mat4> & i, glm::vec3 p, glm::vec3 r) :
+	BufferedLocation {i, Location {p, r}}
+{
+}
+
+BufferedLocation::BufferedLocation(InstanceVertices<glm::mat4> & i, const Location & l) :
+	loc {l}, buffer {i.acquire(getTransform())}
+{
+}
+
+BufferedLocation::operator const Location &() const
+{
+	return loc;
+}
+
+BufferedLocation &
+BufferedLocation::operator=(const Location & l)
+{
+	loc = l;
+	updateBuffer();
+	return *this;
+}
+
+glm::vec3
+BufferedLocation::position() const
+{
+	return loc.pos;
+}
+
+glm::vec3
+BufferedLocation::rotation() const
+{
+	return loc.rot;
+}
+
+void
+BufferedLocation::setPosition(glm::vec3 p, bool update)
+{
+	loc.pos = p;
+	if (update) {
+		updateBuffer();
+	}
+}
+
+void
+BufferedLocation::setRotation(glm::vec3 r, bool update)
+{
+	loc.rot = r;
+	if (update) {
+		updateBuffer();
+	}
+}
+
+void
+BufferedLocation::setLocation(glm::vec3 p, glm::vec3 r)
+{
+	loc.pos = p;
+	loc.rot = r;
+	updateBuffer();
+}
+
+void
+BufferedLocation::updateBuffer()
+{
+	buffer = getTransform();
+}
+
+glm::mat4
+BufferedLocation::getTransform() const
+{
+	return loc.getTransform();
+}
diff --git a/gfx/gl/bufferedLocation.h b/gfx/gl/bufferedLocation.h
new file mode 100644
index 0000000..cf7afed
--- /dev/null
+++ b/gfx/gl/bufferedLocation.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include "instanceVertices.h"
+#include "location.hpp"
+#include <glm/mat4x4.hpp>
+#include <glm/vec3.hpp>
+
+class BufferedLocation {
+public:
+	BufferedLocation(InstanceVertices<glm::mat4> &, glm::vec3 = {}, glm::vec3 = {});
+	BufferedLocation(InstanceVertices<glm::mat4> &, const Location &);
+
+	BufferedLocation & operator=(const Location &);
+
+	operator const Location &() const;
+
+	glm::vec3 position() const;
+	glm::vec3 rotation() const;
+	void setPosition(glm::vec3, bool update = true);
+	void setRotation(glm::vec3, bool update = true);
+	void setLocation(glm::vec3, glm::vec3);
+
+	glm::mat4 getTransform() const;
+
+private:
+	void updateBuffer();
+
+	Location loc;
+	InstanceVertices<glm::mat4>::InstanceProxy buffer;
+};
-- 
cgit v1.2.3