ported the University CGI demo from WINDOWS + GLUT + GLEW + GLU + OpenGL 4 to LINUX WAYLAND + EGL + GLES 2 with minimal cuts

GL_STUFF/SOURCES/SCENE/ObjectInstance.cpp

@@ -0,0 +1,103 @@
+#include "../../HEADERS/SCENE/ObjectInstance.hpp"
+#include <glm/gtc/matrix_transform.hpp>
+
+#define GLM_ENABLE_EXPERIMENTAL
+#include <glm/gtx/transform.hpp>
+#include <glm/gtx/norm.hpp>
+#include <iostream>
+
+/*was glm/gtc/before */
+#include <glm/gtx/quaternion.hpp>
+
+/* aarch64-linux-gnu/include/math.h already defines it */
+#ifndef M_PI
+#define M_PI	3.14159265358979323846264338327950288
+#endif
+
+glm::mat4 WorldInstanceable::getLocalTransform() {
+	glm::mat4 transform = glm::mat4(1.0);
+	transform *= scaleMat;
+	transform *= rotation;
+	return transform;
+}
+
+glm::mat4 WorldInstanceable::getGlobalTransform() {
+	glm::mat4 transform = getLocalTransform();
+
+	//transform = glm::translate(glm::mat4(transform), position);
+	
+	return glm::translate(glm::mat4(1.0), position) * transform;
+}
+
+
+
+void WorldInstanceable::alignTo(glm::vec3 direction) {
+	glm::vec3 localZ;
+
+	direction = glm::normalize(direction);
+	localZ = localFront;
+
+	glm::quat a = glm::rotation(localZ, direction);
+
+	localFront = glm::toMat4(a) * glm::vec4(localFront, 0.0f);
+
+	glm::quat b = glm::rotation(localZ, direction);
+
+	localUp = glm::toMat4(b) * glm::vec4(localUp, 0.0f);
+
+	//++++++++++++++++++++++++++
+	//glm::vec3 right = glm::normalize(cross(localFront, localUp));
+	glm::vec3 right = glm::normalize(cross(localUp, localFront));
+	right.y = 0;
+	glm::vec3 stabilizedR = glm::normalize(right);
+	
+	glm::quat c = glm::rotation(right, stabilizedR);
+	localUp = glm::toMat4(c) * glm::vec4(localUp, 0);
+	localUp = -glm::cross(stabilizedR, localFront);
+	rotation = glm::mat4(glm::mat3(stabilizedR, localUp, localFront));
+	
+}
+
+void WorldInstanceable::setPosition(glm::vec3 position) {
+	this->position = position;
+}
+
+void WorldInstanceable::rotate(glm::vec3 axis, float angle) {
+	rotation *= glm::rotate(glm::radians(angle), axis);
+}
+
+void WorldInstanceable::scale(float factor) {
+	scaleMat *= glm::scale(glm::mat4(1.0), glm::vec3(factor));
+}
+
+void WorldInstanceable::scale(glm::vec3 factors) {
+	scaleMat *= glm::scale(glm::mat4(1.0), factors);
+}
+
+void WorldInstanceable::setup(glm::vec3 position) {
+	this->position = position;
+	localFront = glm::vec3( 0, 0, 1);
+	localUp = glm::vec3( 0, 1, 0);
+	rotation = glm::mat4(1.0f);
+	scaleMat = glm::mat4(1.0f);
+}
+
+WorldInstanceable::WorldInstanceable(glm::vec3 position) {
+	setup(position);
+}
+
+WorldInstanceable::WorldInstanceable(glm::vec3 position, glm::vec3 scale) {
+	setup(position);
+	this->scale(scale);
+}
+
+WorldInstanceable::WorldInstanceable(glm::vec3 position, glm::vec3 axis, float angle) {
+	setup(position);
+	this->rotate(axis, angle);
+}
+
+WorldInstanceable::WorldInstanceable(glm::vec3 position, glm::vec3 scale, glm::vec3 axis, float angle) {
+	setup(position);
+	this->scale(scale);
+	this->rotate(axis, angle);
+}