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

GL_STUFF/SOURCES/EFFECTS/Screen.cpp

@@ -0,0 +1,48 @@
+#include "../../HEADERS/EFFECTS/Screen.h"
+
+extern "C" {
+#include "../../GLES_3_1_compatibility.h"
+#include <glut.h>
+}
+
+#include <string>
+#include "../../HEADERS/UTILS/ShaderMaker.h"
+
+Screen::Screen(int left, int top, int width, int height)
+	: PseudoContext{ left, top, width, height } 
+{
+	glGenVertexArrays(1, &quadVAO);
+	glBindVertexArray(quadVAO);
+	glGenBuffers(1, &vertVBO);
+	glBindBuffer(GL_ARRAY_BUFFER, vertVBO);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(quadVerts), quadVerts, GL_STATIC_DRAW);
+	
+	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float)/**/,(void*) 0);
+	glEnableVertexAttribArray(0);
+	string root = "C:\\Users\\BoBoBoat\\Desktop\\SCUOLA\\CGI\\GL_STUFF\\GL_STUFF\\SOURCES\\EFFECTS\\SCREEN";
+	string vertSh = root + "\\vertexShader_2.glsl";
+	string fragSh = root + "\\fragmentShader_2.glsl";
+	program2 = ShaderMaker::createProgram(&vertSh[0], &fragSh[0]);
+	shaderTexId = glGetUniformLocation(program2, "inTex");
+}
+
+void Screen::setInputTexture(GLuint inputTex) {
+	inputTexture = inputTex;
+}
+
+void Screen::draw() {
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+	//glViewport(left, top, width, height);
+	//gluOrtho2D(0, width, height, 0);
+	glClearColor(0.0, 0.0, 0.0, 0.0);
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	glUseProgram(program2);
+
+	glActiveTexture(GL_TEXTURE0);
+	glBindTexture(GL_TEXTURE_2D, inputTexture);
+	glUniform1i(shaderTexId, 0);
+	glBindVertexArray(quadVAO);
+	glDrawArrays(GL_TRIANGLES, 0, 6);
+	glBindVertexArray(0);
+	glutSwapBuffers();
+}