diffuse、specular贴图的光照

以下是着色器及主函数，换了shader.h之后更改uniform数据明显代码数量减少

为了显示的比较真实，箱子的纹理一共贴了两层，金属框和木头，因为只有金属才会反光，所以只对金属的纹理做了光照

效果如下图

#define GLEW_STATIC
#define STB_IMAGE_IMPLEMENTATION

#include
#include
#include 
#include 
#include 
#include

#include"shader.h"

#include
using namespace std;

bool    keys[1024];
//视角
GLfloat pitch = 0.0f;
GLfloat yaw = -90.0f;
GLfloat lastx = 400.0f;
GLfloat lasty = 300.0f;
GLfloat fov = 45.0f;
GLfloat deltaTime = 0.0f;	// Time between current frame and last frame
GLfloat lastFrame = 0.0f;  	// Time of last frame
bool firstMouse = true;
glm::vec3 cameraPos = glm::vec3(0.0f, 0.7f, 3.0f);
glm::vec3 cameraFront = glm::vec3(0.0f, 0.0f, -2.0f);//方向向量=原点-pos
glm::vec3 cameraUp = glm::vec3(0.0f, 1.0f, 0.0f);



void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods);
void do_moment();
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void roll_callback(GLFWwindow* window, double xoffset, double yoffset);


int main()
{
	glfwInit();
	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);

	GLFWwindow* window = glfwCreateWindow(800, 600, "light", nullptr, nullptr);
	if (window == NULL)
	{
		cout << "Fail to create such window!" << endl;
		glfwTerminate();
	}

	glfwMakeContextCurrent(window);

	glfwSetKeyCallback(window, key_callback);
	glfwSetScrollCallback(window, roll_callback);
	glfwSetCursorPosCallback(window, mouse_callback);

	glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);

	glewExperimental = GL_TRUE;
	glewInit();

	GLfloat vertices[] = {
		// positions          // normals           // texture coords
		-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f,
		0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f,
		0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f,
		0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f,
		-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f,
		-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f,

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

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

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

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

		-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,
		0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f,
		0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f,
		0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f,
		-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
		-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f
	};

	//position
	glm::vec3 cubePositions[] = {

		glm::vec3(0.0f, 0.0f, 0.0f),
		glm::vec3(2.0f, 5.0f, -15.0f),
		glm::vec3(-1.5f, -2.2f, -2.5f),
		glm::vec3(-3.8f, -2.0f, -12.3f),
		glm::vec3(2.4f, -0.4f, -3.5f),
		glm::vec3(-1.7f, 3.0f, -7.5f),
		glm::vec3(1.3f, -2.0f, -2.5f),
		glm::vec3(1.5f, 2.0f, -2.5f),
		glm::vec3(1.5f, 0.2f, -1.5f),
		glm::vec3(-1.3f, 1.0f, -1.5f)

	};

	glViewport(0, 0, 800, 600);
	glEnable(GL_DEPTH_TEST);

	Shader shadercub("cub.vert", "cub.frag");

	GLuint VBO, cubVAO;
	glGenBuffers(1, &VBO);
	glGenVertexArrays(1, &cubVAO);

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

	glBindVertexArray(cubVAO);
	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), 0);
	glEnableVertexAttribArray(0);

	glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (void*)(3 * sizeof(float)));
	glEnableVertexAttribArray(1);

	glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (void*)(6 * sizeof(float)));
	glEnableVertexAttribArray(2);

	glBindVertexArray(0);


	//texture
	unsigned int texture,texture1;
	glGenTextures(1, &texture);
	glBindTexture(GL_TEXTURE_2D, texture);
	// set the texture wrapping parameters
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);	// set texture wrapping to GL_REPEAT (default wrapping method)
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	// set texture filtering parameters
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    //load
	int height, width, nrChannel;
	unsigned char *date = stbi_load("container2.png", &width, &height, &nrChannel, 0);

	//check
	if (date)
	{
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, date);
		glGenerateMipmap(GL_TEXTURE_2D);
	}
	else
	{
		cout << "Failed to load texture" << endl;
	}
	stbi_image_free(date);

	glGenTextures(1, &texture1);
	glBindTexture(GL_TEXTURE_2D, texture1);
	// set the texture wrapping parameters
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);	// set texture wrapping to GL_REPEAT (default wrapping method)
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	// set texture filtering parameters
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	//load
    date = stbi_load("container2_specular.png", &width, &height, &nrChannel, 0);

	//check
	if (date)
	{
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, date);
		glGenerateMipmap(GL_TEXTURE_2D);
	}
	else
	{
		cout << "Failed to load texture" << endl;
	}
	stbi_image_free(date);

	while (!glfwWindowShouldClose(window)){
		GLfloat currentFrame = glfwGetTime();
		deltaTime = currentFrame - lastFrame;
		lastFrame = currentFrame;

		glfwPollEvents();
		do_moment();

		glClearColor(0.3f, 0.3f, 0.3f, 1.0f);
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

		shadercub.use();

		shadercub.setUniform3f("viewPos", cameraPos);

		//material
		shadercub.setInt("material.diffuse", 0);
		shadercub.setInt("material.specular", 1);
		shadercub.setFloat("material.shininess", 32.0f);

		glActiveTexture(GL_TEXTURE0);
		glBindTexture(GL_TEXTURE_2D, texture);

		glActiveTexture(GL_TEXTURE1);
		glBindTexture(GL_TEXTURE_2D, texture1);

		//light change

		glm::vec3 lightColor = glm::vec3(1.0f, 1.0f, 1.0f);

		glm::vec3 diffuseColor = lightColor * glm::vec3(0.5f); // Decrease the influence 
		glm::vec3 ambientColor = diffuseColor * glm::vec3(0.2f); // Low influence 

		shadercub.setUniform3f("light.direction", glm::vec3(-0.2f, -1.0f, -0.3f));
		shadercub.setUniform3f("light.ambient", ambientColor);
		shadercub.setUniform3f("light.diffuse", diffuseColor);
		shadercub.setUniform3f("light.specular", glm::vec3(1.0f, 1.0f, 1.0f));

		glm::mat4 view = glm::lookAt(cameraPos, cameraPos + cameraFront, cameraUp);
		glm::mat4 projection = glm::perspective(fov, (GLfloat)800 / (GLfloat)400, 0.1f, 100.0f);
		// Pass the matrices to the shader
		shadercub.setUniformMatrix4fv("view", view);
		shadercub.setUniformMatrix4fv("projection", projection);


		// Draw the container (using container's vertex attributes)
		glBindVertexArray(cubVAO);
		
		for (int i = 0; i < 10; i++){
			glm::mat4 model;
			model = glm::translate(model, cubePositions[i]);
			GLfloat angle = 20.0f*i;
			model = glm::rotate(model, angle, glm::vec3(1.0f, 0.3f, 0.5f));
			shadercub.setUniformMatrix4fv("model", model);
			glDrawArrays(GL_TRIANGLES, 0, 36);
		}

		glBindVertexArray(0);

		glfwSwapBuffers(window);
	}
	glfwTerminate();

	return 0;
}

void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
	if (action == GLFW_PRESS)
		keys[key] = true;
	else if (action == GLFW_RELEASE)
		keys[key] = false;
	if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
	{
		glfwSetWindowShouldClose(window, GL_TRUE); // 关闭窗口
	}
}
void do_moment()
{
	// 摄像机控制
	GLfloat cameraSpeed = 5.0f * deltaTime;

	if (keys[GLFW_KEY_W])
		cameraPos += cameraSpeed * cameraFront;

	if (keys[GLFW_KEY_S])
		cameraPos -= cameraSpeed * cameraFront;

	if (keys[GLFW_KEY_A])
		cameraPos -= glm::normalize(glm::cross(cameraFront, cameraUp)) * cameraSpeed;

	if (keys[GLFW_KEY_D])
		cameraPos += glm::normalize(glm::cross(cameraFront, cameraUp)) * cameraSpeed;
}
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
{
	if (firstMouse){
		xpos = lastx;
		ypos = lasty;
		firstMouse = false;
	}
	GLfloat offsetx = xpos - lastx;
	GLfloat offsety = lasty - ypos;
	lastx = xpos;
	lasty = ypos;

	GLfloat sensitivity = 0.05f;
	offsetx *= sensitivity;
	offsety *= sensitivity;

	yaw += offsetx;
	pitch += offsety;

	if (pitch > 89.9)
		pitch = 89.9f;
	if (pitch < -89.9)
		pitch = -89.9f;

	glm::vec3 front;
	front.x = cos(glm::radians(yaw)) * cos(glm::radians(pitch));
	front.y = sin(glm::radians(pitch));
	front.z = sin(glm::radians(yaw)) * cos(glm::radians(pitch));
	cameraFront = glm::normalize(front);
}
void roll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
	if (fov >= 1.0f && fov <= 45.0f)
		fov -= yoffset;
	if (fov <= 1.0f)
		fov = 1.0f;
	if (fov >= 45.0f)
		fov = 45.0f;
}#version 330 core
 
in vec3 Normal;
in vec3 FragPos;
in vec2 TexCoords;
out vec4 color;

uniform vec3 viewPos;

struct Material              //材质
{    
	 sampler2D diffuse;
	 sampler2D specular;
	 float shininess;
};
uniform Material material;

struct Light                  //光线
{ 
    vec3 direction;
    vec3 ambient; 
    vec3 diffuse; 
    vec3 specular; 
};
uniform Light light;

void main()
{
     vec3 ambient = light.ambient * vec3(texture(material.diffuse, TexCoords));
	  vec3 norm = normalize(Normal);
    vec3 lightDir = normalize(-light.direction);
    float diff = max(dot(norm, lightDir), 0.0);
    vec3 diffuse = light.diffuse * diff * vec3(texture(material.diffuse, TexCoords));
 
    // Specular
    vec3 viewDir = normalize(viewPos - FragPos);
    vec3 reflectDir = reflect(-lightDir, norm);
    float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
    vec3 specular = light.specular * spec * vec3(texture(material.specular, TexCoords)); 
    vec3 result = ambient + diffuse + specular;
    color = vec4(result, 1.0f);
}#version 330 core
layout (location = 0) in vec3 position;
layout(location=1)in vec3 normal;
layout(location=2)in vec2 texcoord;

uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
 
out vec3 Normal;
out vec3 FragPos;
out vec2 TexCoords;

void main()
{
    gl_Position = projection*view*model*vec4(position,1.0f);
	FragPos = vec3(model * vec4(position, 1.0f));
	Normal = mat3(transpose(inverse(model))) * normal;
	TexCoords=texcoord;
}