金属:如何在不进行颜色/灰度转换的情况下将图像附加到着色器？

// 加载纹理
GLuint textureID;
glGenTextures(1, &textureID);
glBindTexture(GL_TEXTURE_2D, textureID);
// 设置纹理参数
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);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// 加载图像数据到纹理
int width, height, nrChannels;
unsigned char *data = stbi_load("path_to_image.jpg", &width, &height, &nrChannels, 0);
if (data)
{
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
    glGenerateMipmap(GL_TEXTURE_2D);
}
else
{
    std::cout << "Failed to load texture" << std::endl;
}
stbi_image_free(data);

// 在着色器中使用纹理
// 顶点着色器
const char *vertexShaderSource = "#version 330 core\n"
    "layout (location = 0) in vec3 aPos;\n"
    "layout (location = 1) in vec2 aTexCoord;\n"
    "out vec2 TexCoord;\n"
    "void main()\n"
    "{\n"
    "   gl_Position = vec4(aPos, 1.0);\n"
    "   TexCoord = aTexCoord;\n"
    "}\0";
// 片段着色器
const char *fragmentShaderSource = "#version 330 core\n"
    "out vec4 FragColor;\n"
    "in vec2 TexCoord;\n"
    "uniform sampler2D ourTexture;\n"
    "void main()\n"
    "{\n"
    "   FragColor = texture(ourTexture, TexCoord);\n"
    "}\n\0";

// 编译和链接着色器程序，然后在渲染循环中使用它