利用键盘左右键使图像左右移动，上下键使图像的两个纹理可见度比例上下调整

利用键盘左右键使图像左右移动，

glm::mat4 trans;
        trans = glm::translate(trans, glm::vec3(translation, 0.0f, 0.0f));
        glUniformMatrix4fv(glGetUniformLocation(ourShader.ID, "transform"), 1, GL_FALSE, glm::value_ptr(trans));

void processInput(GLFWwindow* window)
{
    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
        glfwSetWindowShouldClose(window, true);
if (glfwGetKey(window, GLFW_KEY_LEFT) == GLFW_PRESS)
    {
        translation -= 0.001f;
        if (translation <= -0.5f)
            translation = -0.5f;
    }

    if (glfwGetKey(window, GLFW_KEY_RIGHT) == GLFW_PRESS)
    {
        translation += 0.001f;
        if (translation >= 0.5f)
            translation = 0.5f;
    }
}

上下键使图像的两个纹理可见度比例上下调整

ourShader.setFloat("mixValue", mixValue);
void processInput(GLFWwindow* window)
{
    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
        glfwSetWindowShouldClose(window, true);

    //用键盘上下键控制两个纹理的可见度比例
    if (glfwGetKey(window, GLFW_KEY_UP) == GLFW_PRESS)
    {
        mixValue += 0.001f;
        if (mixValue >= 1.0f)
            mixValue = 1.0f;
    }
    if (glfwGetKey(window, GLFW_KEY_DOWN) == GLFW_PRESS)
    {
        mixValue -= 0.001f;
        if (mixValue <= 0.0f)
            mixValue = 0.0f;
    }
}