[CORE][ADD] SkyBox Merge

FinalProject/sceneviewer.cpp

@@ -4,7 +4,6 @@
 #include <qresource.h>
 #include <qurl.h>
 #include <qdir.h>
-#include <time.h>
 
 #include "illuminer.h"
 

FinalProject/sceneviewer.h

@@ -13,7 +13,7 @@
 #include "illuminer.h"
 #include "utils.h"
 #include "logger.h"
-
+#include "skybox.h"
 
 class SceneViewer : public QOpenGLWidget, protected QOpenGLFunctions
 {
@@ -27,6 +27,8 @@ private:
     DirLight* _dirLight = nullptr;
     // Shader program for objects
     ShaderProgram _shaderProgram = ShaderProgram::empty();
+    ShaderProgram _skyShader = ShaderProgram::empty();
+    skybox* sky;
     // Main camera
     Camera _camera;
     float _cameraMovementSpeed = 0.02f;

FinalProject/skybox.cpp

@@ -0,0 +1,70 @@
+#include "utils.h"
+#include "skybox.h"
+#include "shader.h"
+#include "camera.h"
+
+#include <STBImage/stb_image.h>
+#include <vector>
+#include <string>
+
+skybox::skybox(std::string path){
+    faces.clear();
+    faces.push_back(path + "/right.jpg");
+    faces.push_back(path + "/left.jpg");
+    faces.push_back(path + "/bottom.jpg");
+    faces.push_back(path + "/top.jpg");
+    faces.push_back(path + "/front.jpg");
+    faces.push_back(path + "/back.jpg");
+
+    cubemapTexture = loadCubemap(faces);
+    
+    OPENGL_EXTRA_FUNCTIONS->glGenVertexArrays(1, &skyboxVAO);
+    OPENGL_EXTRA_FUNCTIONS->glGenBuffers(1, &skyboxVBO);
+    OPENGL_EXTRA_FUNCTIONS->glBindVertexArray(skyboxVAO);
+    OPENGL_EXTRA_FUNCTIONS->glBindBuffer(GL_ARRAY_BUFFER, skyboxVBO);
+    OPENGL_EXTRA_FUNCTIONS->glBufferData(GL_ARRAY_BUFFER, sizeof(skyboxVertices), &skyboxVertices, GL_STATIC_DRAW);
+    OPENGL_EXTRA_FUNCTIONS->glEnableVertexAttribArray(0);
+    OPENGL_EXTRA_FUNCTIONS->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
+}
+
+void skybox::render() {
+    OPENGL_EXTRA_FUNCTIONS->glDepthFunc(GL_LEQUAL);  // change depth function so depth test passes when values are equal to depth buffer's content
+    // skybox cube
+    OPENGL_EXTRA_FUNCTIONS->glBindVertexArray(skyboxVAO);
+    OPENGL_EXTRA_FUNCTIONS->glActiveTexture(GL_TEXTURE0);
+    OPENGL_EXTRA_FUNCTIONS->glBindTexture(GL_TEXTURE_CUBE_MAP, cubemapTexture);
+    OPENGL_EXTRA_FUNCTIONS->glDrawArrays(GL_TRIANGLES, 0, 36);
+    OPENGL_EXTRA_FUNCTIONS->glBindVertexArray(0);
+    OPENGL_EXTRA_FUNCTIONS->glDepthFunc(GL_LESS); // set depth function back to default
+}
+
+unsigned int skybox::loadCubemap(std::vector<std::string> faces)
+{
+    unsigned int textureID;
+    OPENGL_FUNCTIONS->glGenTextures(1, &textureID);
+    OPENGL_FUNCTIONS->glBindTexture(GL_TEXTURE_CUBE_MAP, textureID);
+    stbi_set_flip_vertically_on_load(true);
+
+    int width, height, nrChannels;
+    for (unsigned int i = 0; i < faces.size(); i++)
+    {
+        unsigned char* data = stbi_load(faces[i].c_str(), &width, &height, &nrChannels, 0);
+        if (data)
+        {
+            OPENGL_FUNCTIONS->glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
+            stbi_image_free(data);
+        }
+        else
+        {
+            std::cout << "Cubemap texture failed to load at path: " << faces[i] << std::endl;
+            stbi_image_free(data);
+        }
+    }
+    OPENGL_FUNCTIONS->glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    OPENGL_FUNCTIONS->glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    OPENGL_FUNCTIONS->glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    OPENGL_FUNCTIONS->glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    OPENGL_FUNCTIONS->glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
+
+    return textureID;
+}

FinalProject/skybox.h

@@ -0,0 +1,63 @@
+#pragma once
+
+#include "utils.h"
+#include "shader.h"
+#include "camera.h"
+
+#include <vector>
+#include <string>
+
+
+class skybox { 
+public:
+    std::vector<std::string> faces;
+    skybox(std::string path);
+    unsigned int cubemapTexture, skyboxVAO, skyboxVBO;
+    void render();
+private:
+    unsigned int loadCubemap(std::vector<std::string> faces);
+    float skyboxVertices[108] = {
+        // positions          
+        -1.0f,  1.0f, -1.0f,
+        -1.0f, -1.0f, -1.0f,
+         1.0f, -1.0f, -1.0f,
+         1.0f, -1.0f, -1.0f,
+         1.0f,  1.0f, -1.0f,
+        -1.0f,  1.0f, -1.0f,
+
+        -1.0f, -1.0f,  1.0f,
+        -1.0f, -1.0f, -1.0f,
+        -1.0f,  1.0f, -1.0f,
+        -1.0f,  1.0f, -1.0f,
+        -1.0f,  1.0f,  1.0f,
+        -1.0f, -1.0f,  1.0f,
+
+         1.0f, -1.0f, -1.0f,
+         1.0f, -1.0f,  1.0f,
+         1.0f,  1.0f,  1.0f,
+         1.0f,  1.0f,  1.0f,
+         1.0f,  1.0f, -1.0f,
+         1.0f, -1.0f, -1.0f,
+
+        -1.0f, -1.0f,  1.0f,
+        -1.0f,  1.0f,  1.0f,
+         1.0f,  1.0f,  1.0f,
+         1.0f,  1.0f,  1.0f,
+         1.0f, -1.0f,  1.0f,
+        -1.0f, -1.0f,  1.0f,
+
+        -1.0f,  1.0f, -1.0f,
+         1.0f,  1.0f, -1.0f,
+         1.0f,  1.0f,  1.0f,
+         1.0f,  1.0f,  1.0f,
+        -1.0f,  1.0f,  1.0f,
+        -1.0f,  1.0f, -1.0f,
+
+        -1.0f, -1.0f, -1.0f,
+        -1.0f, -1.0f,  1.0f,
+         1.0f, -1.0f, -1.0f,
+         1.0f, -1.0f, -1.0f,
+        -1.0f, -1.0f,  1.0f,
+         1.0f, -1.0f,  1.0f
+    };
+};