在 OpenGL 中顯示兩個不同的圖像

Question

我最近剛開始研究 OpenGL。 當涉及到在具有兩個不同紋理單元的單獨對象中顯示兩個圖像時，我需要幫助。 第一張圖像被渲染兩次，而不是得到兩張不同的圖像。 請問您認為可能有什么問題？

 int width, height, width1, height1;
    unsigned char* image = SOIL_load_image("res/images/image1.jpg", &width, &height, 0, SOIL_LOAD_RGBA);
    unsigned char* image1 = SOIL_load_image("res/images/image2.jpg", &width1, &height1, 0, SOIL_LOAD_RGBA);

    GLuint texture, texture1;

    //Texture0
    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_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, image);
    glGenerateMipmap(GL_TEXTURE_2D);
    SOIL_free_image_data(image);
    glBindTexture(GL_TEXTURE_2D, 0);

    //Texture 1

    glGenTextures(1, &texture1);
    glBindTexture(GL_TEXTURE_2D, texture1);

    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);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width1, height1, 0, GL_RGBA, GL_UNSIGNED_BYTE, image1);
    glGenerateMipmap(GL_TEXTURE_2D);
    SOIL_free_image_data(image1);
    glBindTexture(GL_TEXTURE_2D, 0);


    while (!glfwWindowShouldClose(window)) {
        glfwPollEvents();
        glViewport(0, 0, screenWidth, screenHeight);
        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);
        shader.Use();
        glActiveTexture(GL_TEXTURE0);
        glBindTexture(GL_TEXTURE_2D, texture);
        glUniform1i(glGetUniformLocation(shader.Program, "texture0"), 0);
        
        glActiveTexture(GL_TEXTURE1);
        glBindTexture(GL_TEXTURE_2D, texture1);
        glUniform1i(glGetUniformLocation(shader.Program, "texture1"), 0); // the variable is the same with that of in core.frag
        glBindVertexArray(VAO);
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
        glDrawElements(GL_TRIANGLES, 12, GL_UNSIGNED_INT, 0);
        glBindVertexArray(0);
        glfwSwapBuffers(window);

Answer 1

您在繪制時使用了兩個不同的紋理單元，但在綁定和加載 2 個紋理時使用了相同的紋理單元。 要么刪除glActiveTexture(GL_TEXTURE1); 從繪制之前或使用glActiveTexture(GL_TEXTURE1); 在第二次紋理加載之前