lot of opengl draw work to get image on screen

CMakeLists.txt

@@ -11,7 +11,7 @@ set(CMAKE_TOOLCHAIN_FILE ${CMAKE_CURRENT_SOURCE_DIR}/external/vcpkg/scripts/buil
 
 project(RayTracer)
 
-
+find_package(glew CONFIG REQUIRED)
 find_package(assimp CONFIG REQUIRED)
 find_package(glfw3 CONFIG REQUIRED)
 find_package(glm CONFIG REQUIRED)
@@ -21,6 +21,7 @@ add_executable(RayTracer "")
 target_include_directories(RayTracer PUBLIC src/)
 target_link_libraries(RayTracer PUBLIC assimp::assimp)
 target_link_libraries(RayTracer PUBLIC glfw)
+target_link_libraries(RayTracer PUBLIC GLEW::glew)
 target_link_libraries(RayTracer PUBLIC glm::glm)
 target_link_libraries(RayTracer PUBLIC KTX::ktx)
 

src/main.cpp

@@ -1,14 +1,24 @@
-#include "window/Window.h"
-#include "util/ModelLoader.h"
 #include "scene/BVH.h"
+#include "util/ModelLoader.h"
+#include "window/Window.h"
 
-int main() {
+int main()
+{
     BVH bvh;
-    bvh.addModels(ModelLoader::loadModel("../../cube.fbx"));
+    bvh.addModels(ModelLoader::loadModel("../../cube.fbx"), glm::mat4());
     bvh.generate();
-	Window w(1920, 1080);
-	while (true) {
-		w.update();
-	}
-	return 0;
+    Window w(1920, 1080);
+    std::vector<uint32_t> texture(1920 * 1080);
+    for (int j = 10; j < 100; ++j)
+    {
+        for (int i = 0; i < 1920; ++i)
+        {
+            texture[j * 1920 + i] = 0xff00ffff;
+        }
+    }
+    while (true)
+    {
+        w.update(texture);
+    }
+    return 0;
 }

src/scene/AABB.h

@@ -1,5 +1,6 @@
 #pragma once
-#include <glm/vec3.hpp>
+#include <array>
+#include <glm/glm.hpp>
 #include <utility>
 
 struct AABB
@@ -21,17 +22,32 @@ struct AABB
         max.y = std::max(max.y, pos.y);
         max.z = std::max(max.z, pos.z);
     }
+    void transform(glm::mat4 transform)
+    {
+        std::array<glm::vec3, 8> corners;
+        corners[0] = glm::vec3(min.x, min.y, min.z);
+        corners[1] = glm::vec3(min.x, min.y, max.z);
+        corners[2] = glm::vec3(min.x, max.y, min.z);
+        corners[3] = glm::vec3(min.x, max.y, max.z);
+        corners[4] = glm::vec3(max.x, min.y, min.z);
+        corners[5] = glm::vec3(max.x, min.y, max.z);
+        corners[6] = glm::vec3(max.x, max.y, min.z);
+        corners[7] = glm::vec3(max.x, max.y, max.z);
+        min = glm::vec3(std::numeric_limits<float>::max());
+        max = glm::vec3(std::numeric_limits<float>::lowest());
+        for (int i = 0; i < 8; ++i)
+        {
+            glm::vec4 transformed = transform * glm::vec4(corners[i].x, corners[i].y, corners[i].z, 1.0f);
+            min = glm::vec3(std::min(min.x, transformed.x), std::min(min.y, transformed.y), std::min(min.z, transformed.z));
+            max = glm::vec3(std::max(max.x, transformed.x), std::max(max.y, transformed.y), std::max(max.z, transformed.z));
+        }
+    }
     static AABB combine(AABB lhs, AABB rhs)
     {
-        AABB result;
-
-        result.min.x = std::min(lhs.min.x, rhs.min.x);
-        result.min.y = std::min(lhs.min.y, rhs.min.y);
-        result.min.z = std::min(lhs.min.z, rhs.min.z);
-
-        result.max.x = std::max(lhs.max.x, rhs.max.x);
-        result.max.y = std::max(lhs.max.y, rhs.max.y);
-        result.max.z = std::max(lhs.max.z, rhs.max.z);
+        AABB result = {
+            .min = glm::vec3(std::min(lhs.min.x, rhs.min.x), std::min(lhs.min.y, rhs.min.y), std::min(lhs.min.z, rhs.min.z)),
+            .max = glm::vec3(std::max(lhs.max.x, rhs.max.x), std::max(lhs.max.y, rhs.max.y), std::max(lhs.max.z, rhs.max.z)),
+        };
 
         return result;
     }

src/scene/BVH.cpp

@@ -1,12 +1,17 @@
 #include "BVH.h"
 #include <list>
 
-void BVH::addModel(PModel model) { models.push_back(std::move(model)); }
+void BVH::addModel(PModel model, glm::mat4 transform)
+{
+    model->boundingBox.transform(transform);
+    models.push_back(std::move(model));
+}
 
-void BVH::addModels(std::vector<PModel> _models)
+void BVH::addModels(std::vector<PModel> _models, glm::mat4 transform)
 {
     for (int i = 0; i < _models.size(); ++i)
     {
+        _models[i]->boundingBox.transform(transform);
         models.push_back(std::move(_models[i]));
     }
 }

src/scene/BVH.h

@@ -2,12 +2,13 @@
 #include "AABB.h"
 #include "util/Model.h"
 #include <vector>
+#include <glm/glm.hpp>
 
 class BVH
 {
   public:
-    void addModel(PModel model);
-    void addModels(std::vector<PModel> models);
+    void addModel(PModel model, glm::mat4 transform);
+    void addModels(std::vector<PModel> models, glm::mat4 transform);
     void generate();
 
   private:

src/scene/Scene.cpp

@@ -1 +1,3 @@
 #include "Scene.h"
+
+void Scene::render() {}

src/scene/Scene.h

@@ -1,8 +1,13 @@
 #pragma once
+#include "BVH.h"
+#include "window/Window.h"
 
 class Scene
 {
-public:
-private:
-
+  public:
+    void render();
+  private:
+    Window window;
+    std::vector<uint32_t> image;
+    BVH bvh;
 };

src/util/Ray.h

@@ -0,0 +1,8 @@
+#pragma once
+#include <glm/glm.hpp>
+
+struct Ray
+{
+    glm::vec3 origin;
+    glm::vec3 direction;
+};

src/window/Window.cpp

@@ -1,17 +1,105 @@
 #include "Window.h"
+#include <assert.h>
+#include <iostream>
 
-Window::Window(int width, int height)
+#define GLSL(...) "#version 450\n#extension GL_KHR_vulkan_glsl : enable\n" #__VA_ARGS__
+
+Window::Window(int width, int height) : width(width), height(height)
 {
-	glfwInit();
-	window = glfwCreateWindow(width, height, "RayTracer", nullptr, nullptr);
+    glewExperimental = true;
+    assert(glfwInit());
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 5);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); // We don't want the old OpenGL
+    window = glfwCreateWindow(width, height, "RayTracer", nullptr, nullptr);
+    glfwMakeContextCurrent(window);
+    float vertices[] = {
+        // positions        
+        1,  -1, 0,
+        -1, -1, 0,
+        1, 1, 0,
+        1, -1, 0
+    };
+    
+    glGenVertexArrays(1, &vao);
+    glGenBuffers(1, &vbo);
+    // bind the Vertex Array Object first, then bind and set vertex buffer(s), and then configure vertex attributes(s).
+    glBindVertexArray(vao);
+
+    glBindBuffer(GL_ARRAY_BUFFER, vbo);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+    // position attribute
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)0);
+    glEnableVertexAttribArray(0);
+    assert(!glewInit());
+    glGenTextures(1, &texture);
+    glBindTexture(GL_TEXTURE_2D, texture);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
+    program = glCreateProgram();
+    vertShader = glCreateShader(GL_VERTEX_SHADER);
+    fragShader = glCreateShader(GL_FRAGMENT_SHADER);
+    int logLen = 0;
+    const char* vertCode = GLSL(layout(location = 0) in vec3 position
+        layout(location = 0) out vec2 outUV;
+
+                                void main() {
+                                    outUV = vec2((gl_VertexIndex << 1) & 2, gl_VertexIndex & 2);
+                                    gl_Position = vec4(outUV * 2.0f + -1.0f, 0.0f, 1.0f);
+                                });
+    const char* fragCode = GLSL(layout(location = 0) in vec2 uv; layout(location = 0) out vec4 color;
+
+                                uniform sampler2D tex;
+
+                                void main() { color = texture(tex, uv); });
+    glShaderSource(vertShader, 1, &vertCode, nullptr);
+    glCompileShader(vertShader);
+    int success;
+    char infoLog[1024];
+    glGetShaderiv(vertShader, GL_COMPILE_STATUS, &success);
+    if (!success)
+    {
+        glGetShaderInfoLog(vertShader, 1024, NULL, infoLog);
+        std::cout << "ERROR::SHADER_COMPILATION_ERROR\n"
+                  << infoLog << "\n -- --------------------------------------------------- -- " << std::endl;
+    }
+
+    glShaderSource(fragShader, 1, &fragCode, nullptr);
+    glCompileShader(fragShader);
+    glGetShaderiv(fragShader, GL_COMPILE_STATUS, &success);
+    if (!success)
+    {
+        glGetShaderInfoLog(fragShader, 1024, NULL, infoLog);
+        std::cout << "ERROR::SHADER_COMPILATION_ERROR\n"
+                  << infoLog << "\n -- --------------------------------------------------- -- " << std::endl;
+    }
+
+    glAttachShader(program, vertShader);
+    glAttachShader(program, fragShader);
+
+    glLinkProgram(program);
+    glGetProgramiv(program, GL_LINK_STATUS, &logLen);
+    if (logLen > 0)
+    {
+        std::vector<char> log(logLen);
+        glGetProgramInfoLog(program, logLen, &logLen, log.data());
+        std::cout << log.data() << std::endl;
+    }
+    glDeleteShader(vertShader);
+    glDeleteShader(fragShader);
+    textureLocation = glGetUniformLocation(program, "tex");
+    glClearColor(0, 0, 0, 0);
 }
 
-Window::~Window()
-{
-}
+Window::~Window() {}
 
-void Window::update()
+void Window::update(const std::vector<uint32_t>& textureData)
 {
-	glfwPollEvents();
-	glfwSwapBuffers(window);
+    glClear(GL_COLOR_BUFFER_BIT);
+    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, textureData.data());
+    glUseProgram(program);
+    glUniform1i(textureLocation, 0);
+    glDrawArrays(GL_TRIANGLES, 0, 3);
+    glfwSwapBuffers(window);
+    glfwPollEvents();
 }

src/window/Window.h

@@ -1,12 +1,24 @@
 #pragma once
+#include <GL/glew.h>
 #include <glfw/glfw3.h>
+#include <vector>
 
 class Window
 {
-public:
-	Window(int width, int height);
-	~Window();
-	void update();
-private:
-	GLFWwindow* window;
+  public:
+    Window(int width, int height);
+    ~Window();
+    void update(const std::vector<uint32_t>& textureData);
+
+  private:
+    int width;
+    int height;
+    GLuint vao;
+    GLuint vbo;
+    GLuint texture;
+    GLuint program;
+    GLuint vertShader;
+    GLuint fragShader;
+    GLuint textureLocation;
+    GLFWwindow* window;
 };

vcpkg.json

@@ -1,3 +1,3 @@
 {
-  "dependencies": ["assimp", "ktx", "glfw3", "glm", "stb", "fmt"]
+  "dependencies": ["assimp", "ktx", "glfw3", "glew", "glm", "stb", "fmt"]
 }