#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <stb_image.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include <learnopengl/shader.h>
#include <iostream>
void framebuffer_size_callback(GLFWwindow* window, int width, int height);
void processInput(GLFWwindow *window);
// settings
const unsigned int SCR_WIDTH = 800;
const unsigned int SCR_HEIGHT = 600;
GLenum glCheckError_(const char *file, int line)
{
GLenum errorCode;
while ((errorCode = glGetError()) != GL_NO_ERROR)
{
std::string error;
switch (errorCode)
{
case GL_INVALID_ENUM: error = "INVALID_ENUM"; break;
case GL_INVALID_VALUE: error = "INVALID_VALUE"; break;
case GL_INVALID_OPERATION: error = "INVALID_OPERATION"; break;
case GL_STACK_OVERFLOW: error = "STACK_OVERFLOW"; break;
case GL_STACK_UNDERFLOW: error = "STACK_UNDERFLOW"; break;
case GL_OUT_OF_MEMORY: error = "OUT_OF_MEMORY"; break;
case GL_INVALID_FRAMEBUFFER_OPERATION: error = "INVALID_FRAMEBUFFER_OPERATION"; break;
}
std::cout << error << " | " << file << " (" << line << ")" << std::endl;
}
return errorCode;
}
#define glCheckError() glCheckError_(__FILE__, __LINE__)
void APIENTRY glDebugOutput(GLenum source,
GLenum type,
unsigned int id,
GLenum severity,
GLsizei length,
const char *message,
const void *userParam)
{
if(id == 131169 || id == 131185 || id == 131218 || id == 131204) return; // ignore these non-significant error codes
std::cout << "---------------" << std::endl;
std::cout << "Debug message (" << id << "): " << message << std::endl;
switch (source)
{
case GL_DEBUG_SOURCE_API: std::cout << "Source: API"; break;
case GL_DEBUG_SOURCE_WINDOW_SYSTEM: std::cout << "Source: Window System"; break;
case GL_DEBUG_SOURCE_SHADER_COMPILER: std::cout << "Source: Shader Compiler"; break;
case GL_DEBUG_SOURCE_THIRD_PARTY: std::cout << "Source: Third Party"; break;
case GL_DEBUG_SOURCE_APPLICATION: std::cout << "Source: Application"; break;
case GL_DEBUG_SOURCE_OTHER: std::cout << "Source: Other"; break;
} std::cout << std::endl;
switch (type)
{
case GL_DEBUG_TYPE_ERROR: std::cout << "Type: Error"; break;
case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR: std::cout << "Type: Deprecated Behaviour"; break;
case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR: std::cout << "Type: Undefined Behaviour"; break;
case GL_DEBUG_TYPE_PORTABILITY: std::cout << "Type: Portability"; break;
case GL_DEBUG_TYPE_PERFORMANCE: std::cout << "Type: Performance"; break;
case GL_DEBUG_TYPE_MARKER: std::cout << "Type: Marker"; break;
case GL_DEBUG_TYPE_PUSH_GROUP: std::cout << "Type: Push Group"; break;
case GL_DEBUG_TYPE_POP_GROUP: std::cout << "Type: Pop Group"; break;
case GL_DEBUG_TYPE_OTHER: std::cout << "Type: Other"; break;
} std::cout << std::endl;
switch (severity)
{
case GL_DEBUG_SEVERITY_HIGH: std::cout << "Severity: high"; break;
case GL_DEBUG_SEVERITY_MEDIUM: std::cout << "Severity: medium"; break;
case GL_DEBUG_SEVERITY_LOW: std::cout << "Severity: low"; break;
case GL_DEBUG_SEVERITY_NOTIFICATION: std::cout << "Severity: notification"; break;
} std::cout << std::endl;
std::cout << std::endl;
}
int main()
{
// glfw: initialize and configure
// ------------------------------
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, true); // comment this line in a release build!
#ifdef __APPLE__
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#endif
// glfw window creation
// --------------------
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
glfwMakeContextCurrent(window);
if (window == NULL)
{
std::cout << "Failed to create GLFW window" << std::endl;
glfwTerminate();
return -1;
}
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
// tell GLFW to capture our mouse
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// glad: load all OpenGL function pointers
// ---------------------------------------
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
{
std::cout << "Failed to initialize GLAD" << std::endl;
return -1;
}
// enable OpenGL debug context if context allows for debug context
int flags; glGetIntegerv(GL_CONTEXT_FLAGS, &flags);
if (flags & GL_CONTEXT_FLAG_DEBUG_BIT)
{
glEnable(GL_DEBUG_OUTPUT);
glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS); // makes sure errors are displayed synchronously
glDebugMessageCallback(glDebugOutput, nullptr);
glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, nullptr, GL_TRUE);
}
// configure global opengl state
// -----------------------------
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
// OpenGL initial state
Shader shader("debugging.vs", "debugging.fs");
// configure 3D cube
unsigned int cubeVAO, cubeVBO;
float vertices[] = {
// back face
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, // bottom-left
0.5f, 0.5f, -0.5f, 1.0f, 1.0f, // top-right
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, // bottom-right
0.5f, 0.5f, -0.5f, 1.0f, 1.0f, // top-right
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, // bottom-left
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, // top-left
// front face
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, // bottom-left
0.5f, -0.5f, 0.5f, 1.0f, 0.0f, // bottom-right
0.5f, 0.5f, 0.5f, 1.0f, 1.0f, // top-right
0.5f, 0.5f, 0.5f, 1.0f, 1.0f, // top-right
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, // top-left
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, // bottom-left
// left face
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, // top-right
-0.5f, 0.5f, -0.5f, -1.0f, 1.0f, // top-left
-0.5f, -0.5f, -0.5f, -0.0f, 1.0f, // bottom-left
-0.5f, -0.5f, -0.5f, -0.0f, 1.0f, // bottom-left
-0.5f, -0.5f, 0.5f, -0.0f, 0.0f, // bottom-right
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, // top-right
// right face
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, // top-left
0.5f, -0.5f, -0.5f, 0.0f, 1.0f, // bottom-right
0.5f, 0.5f, -0.5f, 1.0f, 1.0f, // top-right
0.5f, -0.5f, -0.5f, 0.0f, 1.0f, // bottom-right
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, // top-left
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, // bottom-left
// bottom face
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f, // top-right
0.5f, -0.5f, -0.5f, 1.0f, 1.0f, // top-left
0.5f, -0.5f, 0.5f, 1.0f, 0.0f, // bottom-left
0.5f, -0.5f, 0.5f, 1.0f, 0.0f, // bottom-left
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, // bottom-right
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f, // top-right
// top face
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, // top-left
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, // bottom-right
0.5f, 0.5f, -0.5f, 1.0f, 1.0f, // top-right
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, // bottom-right
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, // top-left
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f // bottom-left
};
glGenVertexArrays(1, &cubeVAO);
glGenBuffers(1, &cubeVBO);
// fill buffer
glBindBuffer(GL_ARRAY_BUFFER, cubeVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
// link vertex attributes
glBindVertexArray(cubeVAO);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
// load cube texture
unsigned int texture;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
int width, height, nrComponents;
unsigned char *data = stbi_load(FileSystem::getPath("resources/textures/wood.png").c_str(), &width, &height, &nrComponents, 0);
if (data)
{
glTexImage2D(GL_FRAMEBUFFER, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
glGenerateMipmap(GL_TEXTURE_2D);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
else
{
std::cout << "Failed to load texture" << std::endl;
}
stbi_image_free(data);
// set up projection matrix
glm::mat4 projection = glm::perspective(glm::radians(45.0f), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 10.0f);
glUniformMatrix4fv(glGetUniformLocation(shader.ID, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
glUniform1i(glGetUniformLocation(shader.ID, "tex"), 0);
// render loop
// -----------
while (!glfwWindowShouldClose(window))
{
// input
// -----
processInput(window);
// render
// ------
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
shader.use();
float rotationSpeed = 10.0f;
float angle = (float)glfwGetTime() * rotationSpeed;
glm::mat4 model = glm::mat4(1.0f);
model = glm::translate(model, glm::vec3(0.0, 0.0f, -2.5));
model = glm::rotate(model, glm::radians(angle), glm::vec3(1.0f, 1.0f, 1.0f));
glUniformMatrix4fv(glGetUniformLocation(shader.ID, "model"), 1, GL_FALSE, glm::value_ptr(model));
glBindTexture(GL_TEXTURE_2D, texture);
glBindVertexArray(cubeVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
glBindVertexArray(0);
// glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
// -------------------------------------------------------------------------------
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwTerminate();
return 0;
}
// renderQuad() renders a 1x1 XY quad in NDC
// -----------------------------------------
unsigned int quadVAO = 0;
unsigned int quadVBO;
void renderQuad()
{
if (quadVAO == 0)
{
float quadVertices[] = {
// positions // texture Coords
-1.0f, 1.0f, 0.0f, 0.0f, 1.0f,
-1.0f, -1.0f, 0.0f, 0.0f, 0.0f,
1.0f, 1.0f, 0.0f, 1.0f, 1.0f,
1.0f, -1.0f, 0.0f, 1.0f, 0.0f,
};
// setup plane VAO
glGenVertexArrays(1, &quadVAO);
glGenBuffers(1, &quadVBO);
glBindVertexArray(quadVAO);
glBindBuffer(GL_ARRAY_BUFFER, quadVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), &quadVertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
}
glBindVertexArray(quadVAO);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glBindVertexArray(0);
}
// process all input: query GLFW whether relevant keys are pressed/released this frame and react accordingly
// ---------------------------------------------------------------------------------------------------------
void processInput(GLFWwindow *window)
{
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, true);
}
// glfw: whenever the window size changed (by OS or user resize) this callback function executes
// ---------------------------------------------------------------------------------------------
void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{
// make sure the viewport matches the new window dimensions; note that width and
// height will be significantly larger than specified on retina displays.
glViewport(0, 0, width, height);
}
HI