openGL 创建一个旋转的简单的3D模型

正在从learning opengl学习中，再这里作一点简单的记录。

.cpp文件

#include 

// GLEW
#define GLEW_STATIC
#include 

// GLFW
#include 

// Other Libs
#include 

#include 
#include 
#include 

// Other includes
#include "Shader.h"

// Function prototypes
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);

// Window dimensions
const GLuint WIDTH = 800, HEIGHT = 600;

// Holds uniform value of texture mix
GLfloat mixValue = 0.2f;

// The MAIN function, from here we start the application and run the game loop
int main()
{
	// Init GLFW
	glfwInit();
	// Set all the required options for GLFW
	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
	glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
	

	// Create a GLFWwindow object that we can use for GLFW's functions
	GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "LearnOpenGL", nullptr, nullptr);
	glfwMakeContextCurrent(window);

	// Set the required callback functions
	glfwSetKeyCallback(window, key_callback);

	// Set this to true so GLEW knows to use a modern approach to retrieving function pointers and extensions
	glewExperimental = GL_TRUE;
	// Initialize GLEW to setup the OpenGL Function pointers
	glewInit();

	// Define the viewport dimensions
	glViewport(0, 0, WIDTH, HEIGHT);


	// Build and compile our shader program
	Shader ourShader("path/default.vs", "path/default.frag");


	// Set up vertex data (and buffer(s)) and attribute pointers
	GLfloat vertices[] = {
		-0.5f, -0.5f, -0.5f,  0.0f, 0.0f,
		 0.5f, -0.5f, -0.5f,  1.0f, 0.0f,
		 0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
		 0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
		-0.5f,  0.5f, -0.5f,  0.0f, 1.0f,
		-0.5f, -0.5f, -0.5f,  0.0f, 0.0f,

		-0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
		 0.5f, -0.5f,  0.5f,  1.0f, 0.0f,
		 0.5f,  0.5f,  0.5f,  1.0f, 1.0f,
		 0.5f,  0.5f,  0.5f,  1.0f, 1.0f,
		-0.5f,  0.5f,  0.5f,  0.0f, 1.0f,
		-0.5f, -0.5f,  0.5f,  0.0f, 0.0f,

		-0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
		-0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
		-0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
		-0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
		-0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
		-0.5f,  0.5f,  0.5f,  1.0f, 0.0f,

		0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
		0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
		0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
		0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
		0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
		0.5f,  0.5f,  0.5f,  1.0f, 0.0f,

		-0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
		 0.5f, -0.5f, -0.5f,  1.0f, 1.0f,
		 0.5f, -0.5f,  0.5f,  1.0f, 0.0f,
		 0.5f, -0.5f,  0.5f,  1.0f, 0.0f,
		-0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
		-0.5f, -0.5f, -0.5f,  0.0f, 1.0f,

		-0.5f,  0.5f, -0.5f,  0.0f, 1.0f,
		0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
		0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
		0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
		-0.5f,  0.5f,  0.5f,  0.0f, 0.0f,
		-0.5f,  0.5f, -0.5f,  0.0f, 1.0f
	};
	GLuint indices[] = {  // Note that we start from 0!
		0, 1, 3, // First Triangle
		1, 2, 3  // Second Triangle
	};
	GLuint VBO, VAO, EBO;
	glGenVertexArrays(1, &VAO);
	glGenBuffers(1, &VBO);
	//glGenBuffers(1, &EBO);

	glBindVertexArray(VAO);

	glBindBuffer(GL_ARRAY_BUFFER, VBO);
	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

	//glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
	//glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);

	// Position attribute
	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)0);
	glEnableVertexAttribArray(0);
	// Color attribute
	glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
	glEnableVertexAttribArray(1);
	// TexCoord attribute
	//glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
	//glEnableVertexAttribArray(2);

	glBindVertexArray(0); // Unbind VAO


						  // Load and create a texture 
	GLuint texture1;
	GLuint texture2;
	// ====================
	// Texture 1
	// ====================
	glGenTextures(1, &texture1);
	glBindTexture(GL_TEXTURE_2D, texture1); // All upcoming GL_TEXTURE_2D operations now have effect on our texture object
											// Set our texture parameters
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);	// Set texture wrapping to GL_REPEAT
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
	// Set texture filtering
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	// Load, create texture and generate mipmaps
	int width, height;
	unsigned char* image = SOIL_load_image("container.jpg", &width, &height, 0, SOIL_LOAD_RGB);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
	glGenerateMipmap(GL_TEXTURE_2D);
	SOIL_free_image_data(image);
	glBindTexture(GL_TEXTURE_2D, 0); // Unbind texture when done, so we won't accidentily mess up our texture.
									 // ===================
									 // Texture 2
									 // ===================
	glGenTextures(1, &texture2);
	glBindTexture(GL_TEXTURE_2D, texture2);
	// Set our texture parameters
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	// Set texture filtering
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	// Load, create texture and generate mipmaps
	image = SOIL_load_image("awesomeface.png", &width, &height, 0, SOIL_LOAD_RGB);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
	glGenerateMipmap(GL_TEXTURE_2D);
	SOIL_free_image_data(image);
	glBindTexture(GL_TEXTURE_2D, 0);

	// Game loop
	while (!glfwWindowShouldClose(window))
	{
		// Check if any events have been activiated (key pressed, mouse moved etc.) and call corresponding response functions
		glfwPollEvents();

		// Render
		// Clear the colorbuffer
		glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
		glEnable(GL_DEPTH_TEST);
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);


		// Bind Textures using texture units
		glActiveTexture(GL_TEXTURE0);
		glBindTexture(GL_TEXTURE_2D, texture1);
		glUniform1i(glGetUniformLocation(ourShader.Program, "ourTexture1"), 0);
		glActiveTexture(GL_TEXTURE1);
		glBindTexture(GL_TEXTURE_2D, texture2);
		glUniform1i(glGetUniformLocation(ourShader.Program, "ourTexture2"), 1);

		// Set current value of uniform mix
		glUniform1f(glGetUniformLocation(ourShader.Program, "mixValue"), mixValue);

		// Activate shader
		ourShader.Use();
		
		glm::mat4 model;
		model = glm::rotate(model, (GLfloat)glfwGetTime() * 50.0f, glm::vec3(0.5f, 1.0f, 0.0f));
		GLint modelLoc = glGetUniformLocation(ourShader.Program, "model");
		glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));

		glm::mat4 view;
		view = glm::translate(view, glm::vec3(0.0f, 0.0f, -3.0f));
		GLint viewLoc = glGetUniformLocation(ourShader.Program, "view");
		glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));

		glm::mat4 projection;
		projection = glm::perspective(45.0f, (GLfloat)WIDTH / (GLfloat)HEIGHT, 0.1f, 100.0f);
		GLint projectionLoc = glGetUniformLocation(ourShader.Program, "projection");
		glUniformMatrix4fv(projectionLoc, 1, GL_FALSE, glm::value_ptr(projection));


		// Draw container
		glBindVertexArray(VAO);
		//glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
		glDrawArrays(GL_TRIANGLES, 0, 36);
		glBindVertexArray(0);

		// Swap the screen buffers
		glfwSwapBuffers(window);
	}
	// Properly de-allocate all resources once they've outlived their purpose
	glDeleteVertexArrays(1, &VAO);
	glDeleteBuffers(1, &VBO);
	glDeleteBuffers(1, &EBO);
	// Terminate GLFW, clearing any resources allocated by GLFW.
	glfwTerminate();
	return 0;
}

// Is called whenever a key is pressed/released via GLFW
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
{
	cout << key << endl;
	if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
		glfwSetWindowShouldClose(window, GL_TRUE);
	// Change value of uniform with arrow keys (sets amount of textre mix)
	if (key == GLFW_KEY_UP && action == GLFW_PRESS)
	{
		mixValue += 0.1f;
		if (mixValue >= 1.0f)
			mixValue = 1.0f;
	}
	if (key == GLFW_KEY_DOWN && action == GLFW_PRESS)
	{
		mixValue -= 0.1f;
		if (mixValue <= 0.0f)
			mixValue = 0.0f;
	}
}

Shader.h

#pragma once
#ifndef SHADER_H
#define SHADER_H

#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;

class Shader
{
public:
	GLuint Program;

	Shader(const GLchar* vertexPath, const GLchar* fragmentPath)
	{
		string vertexCode, fragmentCode;
		ifstream vShaderFile, fShaderFile;

		vShaderFile.exceptions(ifstream::badbit);
		fShaderFile.exceptions(ifstream::badbit);
		try
		{
			vShaderFile.open(vertexPath);
			fShaderFile.open(fragmentPath);

			stringstream vShaderStream, fShaderStream;
			vShaderStream << vShaderFile.rdbuf();
			fShaderStream << fShaderFile.rdbuf();

			vShaderFile.close();
			fShaderFile.close();

			vertexCode = vShaderStream.str();
			fragmentCode = fShaderStream.str();
		}
		catch (std::ifstream::failure e)
		{
			cout << "ERROR::SHADER::FILE_NOT_SUCCESSFULLY_READ" << endl;
		}

		const GLchar* vShaderCode = vertexCode.c_str();
		const GLchar* fShaderCode = fragmentCode.c_str();

		GLint success;
		GLchar infoLog[512];

		GLuint vertex, fragment;
		vertex = glCreateShader(GL_VERTEX_SHADER);
		glShaderSource(vertex, 1, &vShaderCode, NULL);
		glCompileShader(vertex);

		glGetShaderiv(vertex, GL_COMPILE_STATUS, &success);
		if (!success)
		{
			glGetShaderInfoLog(vertex, 512, NULL, infoLog);
			cout << "ERROR_CREATE_SHADER\n" << infoLog << endl;
		}

		fragment = glCreateShader(GL_FRAGMENT_SHADER);
		glShaderSource(fragment, 1, &fShaderCode, NULL);
		glCompileShader(fragment);

		this->Program = glCreateProgram();
		glAttachShader(this->Program, vertex);
		glAttachShader(this->Program, fragment);
		glLinkProgram(this->Program);

		glGetProgramiv(this->Program, GL_LINK_STATUS, &success);
		if (!success)
		{
			glGetProgramInfoLog(this->Program, 512, NULL, infoLog);
			cout << "ERROR_CREATE_PROGRAM\n" << infoLog << endl;
		}

		glDeleteShader(vertex);
		glDeleteShader(fragment);
	}

	void Use()
	{
		glUseProgram(this->Program);
	}
};

#endif

vertex Shader

#version 330 core

layout (location = 0) in vec3 position;
layout (location = 2) in vec3 color;
layout (location = 1) in vec2 texCoord;

out vec3 ourColor;
out vec2 TexCoord;

uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;

void main()
{
	gl_Position = projection * view * model * vec4(position, 1.0f);
	ourColor = color;
	TexCoord = vec2(texCoord.x, 1.0 - texCoord.y);
}

fragment Shader

#version 330 core
in vec3 ourColor;
in vec2 TexCoord;

out vec4 color;

uniform sampler2D ourTexture1;
uniform sampler2D ourTexture2;
uniform float mixValue;

void main()
{
	color = mix(texture(ourTexture1, TexCoord), texture(ourTexture2, TexCoord), mixValue);
}