以上一节Textures代码为基础，没变的部分用灰色表示。

VERTEX_SHADER:

#version 150 corein vec2 position;in vec3 color;in vec2 texcoord;out vec3 Color;out vec2 TexCoord;uniform mat4 trans;uniform mat4 view;uniform mat4 project;void main(){    Color=color;    TexCoord=texcoord;    //gl_Position=trans*vec4(position,0,1);    //只设置view，没设置project什么都看不大    //gl_Position=view*trans*vec4(position,0,1);    gl_Position=project*view*trans*vec4(position,0,1);}

FRAGEMENT_SHADER:

#version 150 corein vec3 Color;in vec2 TexCoord;out vec4 outColor;uniform sampler2D texKit;uniform sampler2D texPupy;uniform vec3 triangleColor;void main(){    //outColor=texture(texKit,TexCoord)*vec4(Color,1.0);    vec4 colKit=texture(texKit,TexCoord);    vec4 colPupy=texture(texPupy,TexCoord);    outColor=mix(colKit,colPupy,0.2);}

源码：

#include"glew.h"#include
     
      #include"freeglut.h"#include
      
       #include
       
        #include"LoadShaders.h"#include"SOIL.h"#include"glm\glm.hpp"#include"glm\gtc\matrix_transform.hpp"#include"glm\gtc\type_ptr.hpp"GLuint vao;GLuint vbo;GLuint ebo;GLuint tbo[2];//translateGLuint uniTransLoc;glm::mat4 trans;        //初始化一个单位矩阵void Init(){    GLfloat vertices[] = {        -0.5, 0.5, 1.0, 0.0, 0.0, 0.0, 0.0,        0.5, 0.5, 0.0, 1.0, 0.0, 1.0, 0.0,        0.5, -0.5, 0.0, 0.0, 1.0, 1.0, 1.0,        -0.5, -0.5, 1.0, 1.0, 1.0, 0.0, 1.0    };    GLuint elements[] = { 0, 1, 2, 2, 3, 0 };    ShaderInfo shaders[] = {        { GL_VERTEX_SHADER, "vertexShader.txt" },        { GL_FRAGMENT_SHADER, "fragementShader.txt" },        { GL_NONE, NULL }    };    GLuint shaderProgram = LoadShaders(shaders);    //**VAO开始记录    glGenVertexArrays(1, &vao);    glBindVertexArray(vao);    //*VBO,需要数据配接    glGenBuffers(1, &vbo);    glBindBuffer(GL_ARRAY_BUFFER, vbo);    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);    //*数据配接    glUseProgram(shaderProgram);    GLuint posAttri = glGetAttribLocation(shaderProgram, "position");    glVertexAttribPointer(posAttri, 2, GL_FLOAT, GL_FALSE, 7 * sizeof(GL_FLOAT), 0);    glEnableVertexAttribArray(posAttri);    GLuint colorAttri = glGetAttribLocation(shaderProgram, "color");    glVertexAttribPointer(colorAttri, 3, GL_FLOAT, GL_FALSE, 7 * sizeof(GL_FLOAT), (void*)(2 * sizeof(GL_FLOAT)));    glEnableVertexAttribArray(colorAttri);    GLuint texAttri = glGetAttribLocation(shaderProgram, "texcoord");    glVertexAttribPointer(texAttri, 2, GL_FLOAT, GL_FALSE, 7 * sizeof(GL_FLOAT), (void*)(5 * sizeof(GL_FLOAT)));    glEnableVertexAttribArray(texAttri);    //*EBO    glGenBuffers(1, &ebo);    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(elements), elements, GL_STATIC_DRAW);    //*TBO    glGenTextures(2, tbo);    int width = 0, height = 0;    unsigned char* image;    glActiveTexture(GL_TEXTURE0);        //对应samplerD texKit    glBindTexture(GL_TEXTURE_2D, tbo[0]);    image = SOIL_load_image("sample.png", &width, &height, 0, SOIL_LOAD_RGB);    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);    SOIL_free_image_data(image);    glUniform1i(glGetUniformLocation(shaderProgram, "texKit"), 0);    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);    glActiveTexture(GL_TEXTURE1);        //对应samplerD texPupy    glBindTexture(GL_TEXTURE_2D, tbo[1]);    image = SOIL_load_image("sample2.png", &width, &height, 0, SOIL_LOAD_RGB);    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);    SOIL_free_image_data(image);    glUniform1i(glGetUniformLocation(shaderProgram, "texPupy"), 1);    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);    //**translation    //trans = glm::rotate(trans, glm::radians(5.f), glm::vec3(0.0f, 0.f, 1.f));    uniTransLoc = glGetUniformLocation(shaderProgram, "trans");    glUniformMatrix4fv(uniTransLoc, 1, GL_FALSE, glm::value_ptr(trans));    //*view 默认eye(0.f,0.f,0.f),center(0.f,0.f,-1.f),up(0.f,1.f,0.f)    glm::mat4 view=glm::lookAt(glm::vec3(1.2f, 1.2f, 1.2f), glm::vec3(0.f, 0.f, 0.f), glm::vec3(0.f, 0.f, 1.f));    GLuint uniViewLoc = glGetUniformLocation(shaderProgram, "view");    glUniformMatrix4fv(uniViewLoc, 1, GL_FALSE, glm::value_ptr(view));    //*project 3D中一定要设置投影，否则看不到    glm::mat4 project = glm::perspective(glm::radians(45.f), 1.f, 1.f, 100.f);    GLuint uniProjectLoc = glGetUniformLocation(shaderProgram, "project");    glUniformMatrix4fv(uniProjectLoc, 1, GL_FALSE, glm::value_ptr(project));    glClearColor(0, 0, 0, 1);}void Display(){    glClear(GL_COLOR_BUFFER_BIT);    glBindVertexArray(vao);    //glDrawArrays(GL_TRIANGLES, 0, 3);    glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);    //glDrawElementsBaseVertex(GL_TRIANGLES, 3, GL_UNSIGNED_INT, 0, 1);    glFlush();}void KeyboardFunc(unsigned char c, int x, int){    switch (c)    {    case 'x':    case 'X':        trans = glm::rotate(trans, glm::radians(5.f), glm::vec3(1.f, 0.f, 0.f));    case 'y':    case 'Y':        trans = glm::rotate(trans, glm::radians(5.f), glm::vec3(0.f, 1.f, 0.f));    case 'z':    case 'Z':        trans = glm::rotate(trans, glm::radians(5.f), glm::vec3(0.f, 0.f, 1.f));    default:        break;    }    glUniformMatrix4fv(uniTransLoc, 1, GL_FALSE, glm::value_ptr(trans));    glutPostRedisplay();}int main(int argc, char** argv){    glutInit(&argc, argv);    glutInitDisplayMode(GLUT_RGBA);    glutInitWindowSize(512, 512);    glutInitWindowPosition(100, 200);    glutInitContextVersion(3, 2);    glutInitContextProfile(GLUT_CORE_PROFILE);    glutCreateWindow(argv[0]);    glewExperimental = true;    glewInit();    Init();    glutDisplayFunc(Display);    glutKeyboardFunc(KeyboardFunc);    glutMainLoop();    return 0;}