improve lighting and use UBOs

meson.build

@@ -8,6 +8,8 @@ glfw3_dep = dependency('glfw3')
 assimp_dep = dependency('assimp')
 incdir = include_directories(['src', 'src/vendor'])
 
+cpp_args = ['-pedantic', '-Wall', '-Wextra']
+
 executable(
     'game',
     './src/common.cpp',
@@ -20,5 +22,6 @@ executable(
     './src/main.cpp',
     './src/vendor/glad/glad.c',
     include_directories : incdir,
-    dependencies : [glfw3_dep, assimp_dep]
+    dependencies : [glfw3_dep, assimp_dep],
+    cpp_args : cpp_args
 )

shaders/light_cube_vertex.glsl

@@ -1,9 +1,12 @@
 #version 330 core
 layout (location = 0) in vec3 aPos;
 
+layout(std140, binding = 0) uniform Matrices
+{
+    mat4 projection;
+    mat4 view;
+};
 uniform mat4 model;
-uniform mat4 view;
-uniform mat4 projection;
 
 void main()
 {

shaders/lighting_fragment.glsl

@@ -59,10 +59,10 @@ uniform PointLight pointLights[POINT_LIGHTS_COUNT];
 vec3 ComputeDirectionalLight(DirectionalLight light, vec3 norm, vec3 viewDir)
 {
     vec3 lightDir = normalize(-light.direction);
-    vec3 reflectDir = reflect(-lightDir, norm);
+    vec3 halfwayDir = normalize(lightDir + viewDir);
 
     float diff = max(dot(norm, lightDir), 0.0);
-    float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+    float spec = pow(max(dot(norm, halfwayDir), 0.0), material.shininess);
 
     vec3 ambient = light.ambient * vec3(texture(material.texture_diffuse1, TexCoords));
     vec3 diffuse = light.diffuse * diff * vec3(texture(material.texture_diffuse1, TexCoords));
@@ -77,10 +77,10 @@ vec3 ComputePointLight(PointLight light, vec3 norm, vec3 viewDir, vec3 fragPos)
     float attenuation = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));
 
     vec3 lightDir = normalize(light.position - fragPos);
-    vec3 reflectDir = reflect(-lightDir, norm);
+    vec3 halfwayDir = normalize(lightDir + viewDir);
 
     float diff = max(dot(norm, lightDir), 0.0);
-    float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+    float spec = pow(max(dot(norm, halfwayDir), 0.0), material.shininess);
 
     vec3 ambient = light.ambient * vec3(texture(material.texture_diffuse1, TexCoords));
     vec3 diffuse = light.diffuse * diff * vec3(texture(material.texture_diffuse1, TexCoords));
@@ -91,7 +91,7 @@ vec3 ComputePointLight(PointLight light, vec3 norm, vec3 viewDir, vec3 fragPos)
 
 vec3 ComputeSpotLight(SpotLight light, vec3 norm, vec3 viewDir, vec3 fragPos) {
     vec3 lightDir = normalize(light.position - fragPos);
-    vec3 reflectDir = reflect(-lightDir, norm);
+    vec3 halfwayDir = normalize(lightDir + viewDir);
 
     float theta = dot(lightDir, normalize(-light.direction));
     float epsilon = light.cutOff - light.outerCutOff;
@@ -101,7 +101,7 @@ vec3 ComputeSpotLight(SpotLight light, vec3 norm, vec3 viewDir, vec3 fragPos) {
     float attenuation = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));
 
     float diff = max(dot(norm, lightDir), 0.0);
-    float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+    float spec = pow(max(dot(norm, halfwayDir), 0.0), material.shininess);
 
     vec3 ambient = light.ambient * vec3(texture(material.texture_diffuse1, TexCoords));
     vec3 diffuse = light.diffuse * diff * vec3(texture(material.texture_diffuse1, TexCoords));

shaders/lighting_vertex.glsl

@@ -7,9 +7,12 @@ out vec3 Normal;
 out vec3 FragPos;
 out vec2 TexCoords;
 
+layout(std140, binding = 0) uniform Matrices
+{
+    mat4 projection;
+    mat4 view;
+};
 uniform mat4 model;
-uniform mat4 view;
-uniform mat4 projection;
 
 void main()
 {

src/camera.cpp

@@ -32,11 +32,11 @@ void Camera::process_mouse(double x, double y)
         pitch = -89.0f;
 
     double pitch_factor = cos(glm::radians(pitch));
-    front = (glm::vec3){
+    front = glm::vec3(
         cos(glm::radians(yaw)) * pitch_factor,
         sin(glm::radians(pitch)),
         sin(glm::radians(yaw)) * pitch_factor
-    };
+    );
 
     last_mouse_x = x;
     last_mouse_y = y;

src/defer.hpp

@@ -1,7 +1,7 @@
 #include "scope_guard.hpp"
 
-#define __$CONCAT(a,b) a ## b
+#define __MACRO_CONCAT(a, b) a ## b
-#define _$CONCAT(a, b) __$CONCAT(a, b)
+#define __MACRO_CONCAT_EXPAND(a, b) __MACRO_CONCAT(a, b)
 
-#define guard(M_fn) auto _$CONCAT(__defer__, __LINE__) = (sg::make_scope_guard((M_fn)));
+#define guard(M_fn) auto __MACRO_CONCAT_EXPAND(__defer__, __LINE__) = (sg::make_scope_guard((M_fn)));
-#define defer(M_stmt) auto _$CONCAT(__defer__, __LINE__) = (sg::make_scope_guard([&](void) -> void { M_stmt ; }));
+#define defer(M_stmt) auto __MACRO_CONCAT_EXPAND(__defer__, __LINE__) = (sg::make_scope_guard([&](void) -> void { M_stmt ; }));

src/main.cpp

@@ -26,9 +26,20 @@
 std::function<void(int width, int height)> framebuffer_size_callback = nullptr;
 std::function<void(double x, double y)> cursor_position_callback = nullptr;
 
+static const int samples = 4;
 
 void GLAPIENTRY gl_message_callback(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar* message, const void* userParam)
 {
+    (void)source;
+    (void)id;
+    (void)severity;
+    (void)length;
+    (void)userParam;
+
+    if (severity == GL_DEBUG_SEVERITY_NOTIFICATION) {
+        return;
+    }
+
     fprintf(stderr, "OPENGL MESSAGE: %s\n", message);
     if (type == GL_DEBUG_TYPE_ERROR) {
         fprintf(stderr, "exiting due to gl error above...\n");
@@ -45,6 +56,9 @@ int main()
     glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
     glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
     glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    if (samples > 0) {
+        glfwWindowHint(GLFW_SAMPLES, samples);
+    }
 
     GLFWwindow *window = glfwCreateWindow(800, 600, "gaming", NULL, NULL);
     if (!window) {
@@ -55,14 +69,16 @@ int main()
     gladLoadGL();
     glfwSwapInterval(0);
 
-    glfwSetFramebufferSizeCallback(window, [](GLFWwindow *_, int width, int height) {
+    glfwSetFramebufferSizeCallback(window, [](GLFWwindow *window, int width, int height) {
+        (void)window;
         if (framebuffer_size_callback) {
             framebuffer_size_callback(width, height);
         }
     });
 
     glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
-    glfwSetCursorPosCallback(window, [](GLFWwindow *_, double x, double y) {
+    glfwSetCursorPosCallback(window, [](GLFWwindow *window, double x, double y) {
+        (void)window;
         if (cursor_position_callback) {
             cursor_position_callback(x, y);
         }
@@ -71,6 +87,9 @@ int main()
     glEnable(GL_DEPTH_TEST);
     glEnable(GL_CULL_FACE);
     glEnable(GL_DEBUG_OUTPUT);
+    if (samples > 0) {
+        glEnable(GL_MULTISAMPLE);
+    }
     glDebugMessageCallback(gl_message_callback, NULL);
 
     glm::vec3 point_light_positions[] = {
@@ -86,15 +105,6 @@ int main()
     glm::mat4 projection = glm::mat4(1.0f);
     Camera camera;
 
-    framebuffer_size_callback = [&projection](int width, int height) {
-        projection = glm::perspective(glm::radians(45.0f), (float)width / (float)height, 0.1f, 100.0f);
-        glViewport(0, 0, width, height);
-    };
-
-    cursor_position_callback = [&camera](double x, double y) {
-        camera.process_mouse(x, y);
-    };
-
 
     std::vector<Mesh> meshes;
     load_model_from_file(meshes, "./assets/model/backpack.obj");
@@ -130,6 +140,29 @@ int main()
         glBindVertexArray(0);
     }
 
+    unsigned int matrices_ubo;
+    {
+        glGenBuffers(1, &matrices_ubo);
+        glBindBuffer(GL_UNIFORM_BUFFER, matrices_ubo);
+        glBufferData(GL_UNIFORM_BUFFER, 2 * sizeof(glm::mat4), NULL, GL_DYNAMIC_DRAW);
+        glBindBuffer(GL_UNIFORM_BUFFER, 0);
+
+        glBindBufferRange(GL_UNIFORM_BUFFER, 0, matrices_ubo, 0, 2 * sizeof(glm::mat4));
+    }
+
+    framebuffer_size_callback = [&projection, matrices_ubo](int width, int height) {
+        projection = glm::perspective(glm::radians(45.0f), (float)width / (float)height, 0.1f, 100.0f);
+        glViewport(0, 0, width, height);
+
+        glBindBuffer(GL_UNIFORM_BUFFER, matrices_ubo);
+        glBufferSubData(GL_UNIFORM_BUFFER, 0, sizeof(glm::mat4), &projection);
+        glBindBuffer(GL_UNIFORM_BUFFER, 0);
+    };
+
+    cursor_position_callback = [&camera](double x, double y) {
+        camera.process_mouse(x, y);
+    };
+
     float delta_time = 0.0f;
     float last_frame_time = 0.0f;
 
@@ -157,6 +190,10 @@ int main()
             camera.movement(delta_time, Camera::MovementDown);
         }
 
+        glBindBuffer(GL_UNIFORM_BUFFER, matrices_ubo);
+        glBufferSubData(GL_UNIFORM_BUFFER, sizeof(glm::mat4), sizeof(glm::mat4), &camera.view);
+        glBindBuffer(GL_UNIFORM_BUFFER, 0);
+
         glClearColor(0.5, 0.5, 0.5, 1.0);
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
@@ -165,11 +202,9 @@ int main()
             {
                 glUseProgram(lit_program);
                 program_set(lit_program, "model", glm::scale(glm::translate(glm::mat4(1.0), glm::vec3(0.0, 0.0, 0.0)), glm::vec3(1.0, 1.0, 1.0)));
-                program_set(lit_program, "projection", projection);
-                program_set(lit_program, "view", camera.view);
                 program_set(lit_program, "viewPos", camera.position);
 
-                program_set(lit_program, "material.shininess", 32.0f);
+                program_set(lit_program, "material.shininess", 64.0f);
 
                 program_set(lit_program, "directionalLight.direction", -0.2f, -1.0f, -0.3f);
                 program_set(lit_program, "directionalLight.ambient", 0.05f, 0.05f, 0.05f);

src/mesh.cpp

@@ -20,14 +20,13 @@ void Mesh::init()
 {
     glGenVertexArrays(1, &vao);
     glGenBuffers(1, &vertices_vbo);
+    glGenBuffers(1, &indicies_ebo);
 
     glBindVertexArray(vao);
-
+    {
-
         glBindBuffer(GL_ARRAY_BUFFER, vertices_vbo);
         glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), &vertices[0], GL_STATIC_DRAW);
 
-    glGenBuffers(1, &indicies_ebo);
         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indicies_ebo);
         glBufferData(GL_ELEMENT_ARRAY_BUFFER, indicies.size() * sizeof(unsigned int), &indicies[0], GL_STATIC_DRAW);
 
@@ -39,8 +38,7 @@ void Mesh::init()
 
         glEnableVertexAttribArray(2);
         glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, textureCoords));
-
+    }
-
     glBindVertexArray(0);
 }
 
@@ -54,10 +52,13 @@ void Mesh::draw(unsigned int program_id) const
         
         glActiveTexture(GL_TEXTURE0 + i);
 
-        if (texture.type == "texture_diffuse") {
+        switch (texture.type) {
+        case Texture::TextureType::DIFFUSE:
             program_set(program_id, ("material.texture_diffuse" + std::to_string(diffuse_number++)).c_str(), static_cast<int>(i));
-        } else if (texture.type == "texture_specular") {
+            break;
+        case Texture::TextureType::SPECULAR:
             program_set(program_id, ("material.texture_specular" + std::to_string(specular_number++)).c_str(), static_cast<int>(i));
+            break;
         }
 
         glBindTexture(GL_TEXTURE_2D, texture.id);
@@ -72,7 +73,7 @@ void Mesh::draw(unsigned int program_id) const
 
 
 static std::unordered_map<std::string, Texture> file_path_to_loaded_texture_cache;
-static void load_material_textures(std::vector<Texture> &out_textures, const aiMaterial *material, const aiTextureType texture_type, const char *type_name, const std::string &texture_root_directory)
+static void load_material_textures(std::vector<Texture> &out_textures, const aiMaterial *material, const aiTextureType texture_type, Texture::TextureType type_name, const std::string &texture_root_directory)
 {
     unsigned int texture_count = aiGetMaterialTextureCount(material, texture_type);
 
@@ -125,11 +126,9 @@ static void visit_node_process_mesh(const aiScene *scene, const aiMesh *mesh, co
         }
     }
 
-    if (mesh->mMaterialIndex >= 0) {
     aiMaterial *material = scene->mMaterials[mesh->mMaterialIndex];
-        load_material_textures(textures, material, aiTextureType_DIFFUSE, "texture_diffuse", *texture_root_directory);
+    load_material_textures(textures, material, aiTextureType_DIFFUSE, Texture::TextureType::DIFFUSE, *texture_root_directory);
-        load_material_textures(textures, material, aiTextureType_SPECULAR, "texture_specular", *texture_root_directory);
+    load_material_textures(textures, material, aiTextureType_SPECULAR, Texture::TextureType::SPECULAR, *texture_root_directory);
-    }
 }
 
 static void visit_node(aiNode *node, const aiScene *scene, std::string *texture_root_directory, std::vector<Mesh> &out_meshes)
@@ -161,5 +160,5 @@ void load_model_from_file(std::vector<Mesh> &out_meshes, const std::string &path
     auto t2 = std::chrono::high_resolution_clock::now();
     std::chrono::duration<double, std::milli> delta = t2 - t1;
 
-    printf("processed %ld meshes in %fms\n", out_meshes.size(), delta.count());
+    printf("load_model_from_file: processed %ld meshes (took %fms)\n", out_meshes.size(), delta.count());
 }

src/mesh.hpp

@@ -12,15 +12,19 @@ struct Vertex {
 };
 
 struct Texture {
+    enum class TextureType {
+        DIFFUSE,
+        SPECULAR
+    };
+
     unsigned int id;
-    std::string type;
+    TextureType type;
 };
 
 struct Mesh {
     std::vector<Vertex> vertices;
     std::vector<Texture> textures;
     std::vector<unsigned int> indicies;
-    bool use_indicies = true;
 
     unsigned int vao, vertices_vbo, indicies_ebo;
 

src/texture.cpp

@@ -3,16 +3,24 @@
 #include "common.hpp"
 #include "vendor/glad/glad.h"
 #include "vendor/stb_image.h"
+#include <cassert>
 #include <cerrno>
+#include <cmath>
 #include <cstdio>
 #include <cstdlib>
+#include <future>
 #include <iostream>
 #include <vector>
 
+struct LoadedImage {
+    unsigned char *data = NULL;
+    int width, height = 0;
+};
+
 
 unsigned int texture_from_file(const char *path)
 {
-    printf("texture_from_file: load %s\n", path);
+    auto t1 = std::chrono::high_resolution_clock::now();
 
     int x, y;
     unsigned char *data = stbi_load(path, &x, &y, NULL, 4);
@@ -37,27 +45,64 @@ unsigned int texture_from_file(const char *path)
 
     glBindTexture(GL_TEXTURE_2D, 0);
 
+    auto t2 = std::chrono::high_resolution_clock::now();
+    std::chrono::duration<double, std::milli> delta = t2 - t1;
+
+    printf("texture_from_file: loaded %s (took %fms)\n", path, delta.count());
+
     return texture;
 }
 
 unsigned int cubemap_from_files(std::vector<const char *> &faces)
 {
+    auto t1 = std::chrono::high_resolution_clock::now();
+
+    assert(faces.size() == 6);
+    unsigned int thread_count = faces.size() / 2;
+    unsigned int images_per_thread = faces.size() / thread_count;
+
+    std::vector<LoadedImage> loaded_images(faces.size());
+    defer(
+        for (auto &image : loaded_images) {
+            free(image.data);
+        }
+    )
+
+    std::vector<std::thread> threads;
+    threads.reserve(thread_count);
+    for (unsigned int i = 0; i < thread_count; i++) {
+        unsigned int image_index = i * images_per_thread;
+        threads.push_back(
+            std::thread {
+                [](unsigned int images_per_thread, unsigned int image_index, std::vector<const char *> *faces, std::vector<LoadedImage> *images) {
+                    for (unsigned int i = image_index; i < (image_index + images_per_thread); i++) {
+                        LoadedImage *image = &images->at(i);
+                        image->data = stbi_load(faces->at(i), &image->width, &image->height, NULL, 3);
+                    }
+                },
+                images_per_thread,
+                image_index,
+                &faces,
+                &loaded_images
+            }
+        );
+    }
+
+    for (auto &task : threads) {
+        task.join();
+    }
+
+
     unsigned int texture;
     glGenTextures(1, &texture);
     glBindTexture(GL_TEXTURE_CUBE_MAP, texture);
 
-    int width, height = 0;
+    for (unsigned int i = 0; i < loaded_images.size(); i++) {
-    unsigned char *data = NULL;
+        LoadedImage *image = &loaded_images[i];
-    for (unsigned int i = 0; i < faces.size(); i++) {
+        if (image->data) {
-        printf("cubemap_from_files: load %s\n", faces[i]);
+            glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB, image->width, image->height, 0, GL_RGB, GL_UNSIGNED_BYTE, image->data);
-
-        data = stbi_load(faces[i], &width, &height, NULL, 3);
-        defer(stbi_image_free(data));
-
-        if (data) {
-            glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
         } else {
-            fprintf(stderr, "cubemap_from_files: failed to load file %s\n", faces[i]);
+            fprintf(stderr, "cubemap_from_files: file was not loaded: %s\n", faces[i]);
         }
     }
 
@@ -67,5 +112,10 @@ unsigned int cubemap_from_files(std::vector<const char *> &faces)
     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
 
+    auto t2 = std::chrono::high_resolution_clock::now();
+    std::chrono::duration<double, std::milli> delta = t2 - t1;
+
+    printf("cubemap_from_files: loaded %ld faces (took %fms)\n", faces.size(), delta.count());
+
     return texture;
 }