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/ReelManager.cpp

@@ -0,0 +1,54 @@
+/*
+#include <GL/glew.h>
+*/
+#include <GLES2/gl2.h>
+#include "../../HEADERS/EFFECTS/ReelManager.h"
+#include <vector>
+
+/* equals stdlib.h from C */
+#include <cstdlib>
+
+ReelManager::ReelManager(unsigned int textureNumber, unsigned int width, unsigned int height) {
+	TEXTURE_NUM = textureNumber;
+	textures = (GLuint*) malloc(TEXTURE_NUM * sizeof(GLuint));
+	glGenFramebuffers(1, &FBO);
+	glGenTextures(TEXTURE_NUM, textures);
+	for (int i = 0; i < TEXTURE_NUM; i++) {
+		glActiveTexture(GL_TEXTURE0);
+		glBindTexture(GL_TEXTURE_2D, textures[i]);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
+	}
+	glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+void ReelManager::nextTexture() {
+	currentIndex = ++currentIndex % TEXTURE_NUM;
+	glBindFramebuffer(GL_FRAMEBUFFER, FBO);
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, textures[currentIndex], 0);
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}
+
+void ReelManager::clearTexture() {
+	glBindFramebuffer(GL_FRAMEBUFFER, FBO);
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, textures[currentIndex], 0);
+	glClearColor(0.0, 0.0, 0.0, 0.0);
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}
+
+GLuint ReelManager::getFBO() {
+	return FBO;
+}
+
+std::vector<GLuint> ReelManager::getTextures() {
+	std::vector<GLuint> vec = std::vector<GLuint>();
+	for (int i = currentIndex + 1 ; i < TEXTURE_NUM; i++) {
+		vec.push_back(textures[i]);
+	}
+	for (int i = 0; i <= currentIndex; i++) {
+		vec.push_back(textures[i]);
+	}
+	return vec;
+}