taste the rainbow

assets/shaders/skybox.fs

@@ -1,108 +1,15 @@
 #version 330 core
 
-// Implements the Phong lighting model with respect to materials and lighting materials
-
-// Structs
-
-struct Material {
-    vec3 diffuse;
-    vec3 specular;
-    float shininess;
-};
-
-struct DirLight {
-    vec3 direction;
-    vec3 ambient;
-    vec3 diffuse;
-    vec3 specular;
-};
-
-struct PointLight {
-    vec3 position;
-    // vec3 direction;
-    vec3 ambient;
-    vec3 diffuse;
-    vec3 specular;
-
-    float constant;
-    float linear;
-    float quadratic;
-};
-
-// I/O
+uniform sampler2D uTexture;
 
 in vec3 vPos;
 in vec3 vNormal;
 in vec2 vTexCoords;
 
-out vec4 FragColor;
-
-#define NR_POINT_LIGHTS 4
-
-uniform vec3 viewPos;
-uniform PointLight pointLights[NR_POINT_LIGHTS];
-uniform int numPointLights;
-uniform DirLight sunLight;
-uniform Material material;
-
-// Functions
-
-vec3 calculateDirectionalLight(DirLight light);
-vec3 calculatePointLight(PointLight light);
-
+out vec4 fColor;
 
 // Main
 
 void main() {
-    vec3 result = vec3(0.0);
-
-    result += calculateDirectionalLight(sunLight);
-    
-    for (int i = 0; i < numPointLights; i++) {
-        result += calculatePointLight(pointLights[i]);
-    }
-
-    FragColor = vec4(result, 1.0);
+    fColor = vec4(vTexCoords, 1.0, 1.0);
 }
-
-vec3 calculateDirectionalLight(DirLight light) {
-    // Calculate diffuse
-    vec3 norm = normalize(vNormal);
-    vec3 lightDir = normalize(-light.direction);
-    float diff = max(dot(norm, lightDir), 0.0);
-
-    // Calculate specular
-    vec3 viewDir = normalize(viewPos - vPos);
-    vec3 reflectDir = reflect(-lightDir, norm);
-    float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
-    
-    vec3 ambient = light.ambient * material.diffuse;
-    vec3 diffuse = light.diffuse * diff * material.diffuse;
-    vec3 specular = light.specular * spec * material.specular;
-    
-    return (ambient + diffuse + specular);
-}
-
-vec3 calculatePointLight(PointLight light) {
-    // Calculate ambient light
-
-    // Calculate diffuse light
-    vec3 norm = normalize(vNormal);
-    vec3 lightDir = normalize(light.position - vPos);
-    float diff = max(dot(norm, lightDir), 0.0);
-
-    // Calculate specular
-    vec3 viewDir = normalize(viewPos - vPos);
-    vec3 reflectDir = reflect(-lightDir, norm);
-    float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
-    
-    // Calculate attenuation
-    float distance = length(light.position - vPos);
-    float attenuation = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));
-
-    vec3 ambient = light.ambient * material.diffuse;
-    vec3 diffuse = light.diffuse * diff * material.diffuse;
-    vec3 specular = light.specular * spec * material.specular;
-
-    return (ambient + diffuse + specular) * attenuation;
-}

assets/shaders/skybox.vs

@@ -7,8 +7,6 @@ out vec3 vPos;
 out vec3 vNormal;
 out vec2 vTexCoords;
 
-uniform mat4 model;
-uniform mat3 normalMatrix;
 uniform mat4 view;
 uniform mat4 projection;
 
@@ -17,4 +15,5 @@ void main()
     gl_Position = projection * vec4(vec3(view * vec4(aPos, 0.0)), 1.0);
     vPos = vec3(vec4(aPos, 1.0));
     vNormal = aNormal;
+    vTexCoords = aTexCoords;
 }

assets/textures/skybox/copyright.txt

@@ -0,0 +1 @@
+null_plainsky is copyright of Jauhn Dabz, jauhn@yahoo.com, https://nullpoint.fragland.net

src/rendering/renderer.cpp

@@ -13,6 +13,7 @@
 #include "defaultmeshes.h"
 #include "../camera.h"
 #include "../part.h"
+#include "texture.h"
 
 #include "renderer.h"
 
@@ -20,6 +21,7 @@ Shader *shader = NULL;
 Shader *skyboxShader = NULL;
 extern Camera camera;
 extern std::vector<Part> parts;
+Texture* skyboxTexture = NULL;
 
 void renderInit(GLFWwindow* window) {
     glViewport(0, 0, 1200, 900);
@@ -28,6 +30,8 @@ void renderInit(GLFWwindow* window) {
 
     glEnable(GL_DEPTH_TEST);
 
+    skyboxTexture = new Texture("assets/textures/skybox/null_plainsky512_ft.jpg", GL_RGB);
+
     // Compile shader
     shader = new Shader("assets/shaders/phong.vs", "assets/shaders/phong.fs");
     skyboxShader = new Shader("assets/shaders/skybox.vs", "assets/shaders/skybox.fs");
@@ -90,46 +94,12 @@ void renderParts() {
 void renderSkyBox() {
     skyboxShader->use();
 
-    // glm::mat4 projection = glm::perspective(glm::radians(45.f), (float)1200 / (float)900, 0.1f, 100.0f);
-    // glm::mat4 view = camera.getLookAt();
-    
-    // shader->set("projection", projection);
-    // shader->set("view", view);
-    // shader->set("material", Material {
-    //     // .ambient = glm::vec3(1.0f, 0.5f, 0.31f),
-    //     .diffuse = glm::vec3(1.0f, 0.5f, 0.31f),
-    //     .specular = glm::vec3(0.5f, 0.5f, 0.5f),
-    //     .shininess = 32.0f,
-    // });
-
-    // shader->set("viewPos", camera.cameraPos);
-
-// view/projection transformations
     glm::mat4 projection = glm::perspective(glm::radians(45.f), (float)1200 / (float)900, 0.1f, 100.0f);
     glm::mat4 view = camera.getLookAt();
     skyboxShader->set("projection", projection);
     skyboxShader->set("view", view);
-    skyboxShader->set("material", Material {
-        // .ambient = glm::vec3(1.0f, 0.5f, 0.31f),
-        .diffuse = glm::vec3(1.0f, 0.5f, 0.31f),
-        .specular = glm::vec3(0.5f, 0.5f, 0.5f),
-        .shininess = 32.0f,
-    });
-    skyboxShader->set("sunLight", DirLight {
-        .direction = glm::vec3(-0.2f, -1.0f, -0.3f),
-        .ambient = glm::vec3(0.2f, 0.2f, 0.2f),
-        .diffuse = glm::vec3(0.5f, 0.5f, 0.5f),
-        .specular = glm::vec3(1.0f, 1.0f, 1.0f),
-    });
-    skyboxShader->set("numPointLights", 0);
 
-    glm::mat4 model = glm::mat4(1.0f);
-    // model = glm::translate(model, part.position);
-    // model = model * glm::mat4_cast(part.rotation);
-    // model = glm::scale(model, part.scale);
-    shader->set("model", model);
-    glm::mat3 normalMatrix = glm::mat3(glm::transpose(glm::inverse(model)));
-    shader->set("normalMatrix", normalMatrix);
+    skyboxShader->set("uTexture", 0);
 
     CUBE_MESH->bind();
     glDrawArrays(GL_TRIANGLES, 0, 36);

src/rendering/texture.cpp

@@ -0,0 +1,43 @@
+#include "texture.h"
+
+#include <GL/glew.h>
+#include <GL/gl.h>
+#include <stb/stb_image.h>
+
+Texture::Texture(const char* texturePath, unsigned int format) {
+    glGenTextures(1, &this->ID);
+    glBindTexture(GL_TEXTURE_2D, this->ID);
+
+    // Wrapping
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+    // Interpolation
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+    // stbi_set_flip_vertically_on_load(true);
+    int width, height, nrChannels;
+    unsigned char *data = stbi_load(texturePath, &width, &height,
+                                    &nrChannels, 0);
+
+    if (!data) {
+        printf("Failed to load texture '%s'\n", texturePath);
+        abort();
+    }
+
+    glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format,
+                 GL_UNSIGNED_BYTE, data);
+    glGenerateMipmap(GL_TEXTURE_2D);
+
+    stbi_image_free(data);
+}
+
+Texture::~Texture() {
+    glDeleteTextures(1, &this->ID);
+}
+
+void Texture::activate(unsigned int textureIdx) {
+    glActiveTexture(GL_TEXTURE0 + textureIdx);
+    glBindTexture(GL_TEXTURE_2D, this->ID);
+}

src/rendering/texture.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#define GL_RGB 0x1907
+
+class Texture {
+private:
+    unsigned int ID;
+public:
+    Texture(const char* texturePath, unsigned format = GL_RGB);
+    ~Texture();
+
+    void activate(unsigned int textureIdx);
+};

src/stb.cpp

@@ -0,0 +1,2 @@
+#define STB_IMAGE_IMPLEMENTATION
+#include <stb/stb_image.h>