Question

我正在使用GLFW和GLEW来初始化窗口，而使用SOIL来加载纹理的图像数据。我正在尝试（并且失败）加载纹理以在屏幕中间的简单方块上显示。这是代码：

VideoView

然后是主循环：

GLuint VAO, VBO, EBO, texture, shaderProgram;
GLFWWindow* window;
const char* vertexShaderSource = //Shown later
const char* fragmentShaderSource = //Shown later

void init()
{
  glfwInit();

  window = glfwCreateWindow(320, 288, "GameBozo", nullptr, nullptr);
  glfwMakeContextCurrent(window);

  glewExperimental = GL_TRUE;
  glewInit()

  glViewport(0, 0, 320, 288);

  GLfloat vertices[] = {
    // Positions          // Colors           // Texture Coords
     0.5f,  0.5f, 0.0f,   1.0f, 0.0f, 0.0f,   1.0f, 1.0f, // Top Right
     0.5f, -0.5f, 0.0f,   0.0f, 1.0f, 0.0f,   1.0f, 0.0f, // Bottom Right
    -0.5f, -0.5f, 0.0f,   0.0f, 0.0f, 1.0f,   0.0f, 0.0f, // Bottom Left
    -0.5f,  0.5f, 0.0f,   1.0f, 1.0f, 0.0f,   0.0f, 1.0f  // Top Left 
  };
  GLuint indices[] = {
    0, 1, 3, // First Triangle
    1, 2, 3  // Second Triangle
  };

  //Generate vertex arrays and buffers
  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);

  //Shaders
  GLuint vertexShader;
  vertexShader = glCreateShader(GL_VERTEX_SHADER);
  glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
  glCompileShader(vertexShader);
  GLuint fragmentShader;
  fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
  glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
  glCompileShader(fragmentShader);
  shaderProgram = glCreateProgram();
  glAttachShader(shaderProgram, vertexShader);
  glAttachShader(shaderProgram, fragmentShader);
  glLinkProgram(shaderProgram);

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



// Load and create a texture 
  glGenTextures(1, &texture);
  glBindTexture(GL_TEXTURE_2D, texture);

  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_NEAREST);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

  int width, height;
  GLubyte* image = SOIL_load_image("path\to\image.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);
}

最后，顶点着色器：

void main()
{
glfwPollEvents();

glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);

glUseProgram(shaderProgram);
glBindVertexArray(VAO);
glBindTexture(GL_TEXTURE_2D, texture);

glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
glBindVertexArray(0);

glfwSwapBuffers(window);
}

片段着色器：

#version 330
layout (location = 0) in vec3 position;
layout (location = 1) in vec3 color;
layout (location = 2) in vec2 texCoord;

out vec3 ourColor;
out vec2 TexCoord;

void main()
{
    gl_Position = vec4(position, 1.0f);
    ourColor = color;
    TexCoord = texCoord;
}

我不知道我做错了什么......广场只会出现白色。

为什么我的OpenGL纹理不能正确显示？

0 个答案: