glDrawElements抛出错误代码GL_INVALID_ENUM(0x500)

Question

我尝试使用OpenGL和索引绘制纹理方块.首先,我使用VAO和VBO绘制一个简单的白色方块.之后,我尝试创建一个索引缓冲区对象来绘制相同的简单白色方块,但它不会绘制任何东西,它会抛出错误核心GL_INVALID_ENUM(0x500).调用后抛出此错误代码glDrawElements.

这里有我的代码的一些部分:

创建索引缓冲区对象,VAO和VBO的函数:

void Object::loadObject(const float *lpfVertices, size_t uVerticesSize, const char *lpbElementsList, size_t uNumElements) {
    this->uNumElements = uNumElements;

    glGenVertexArrays(1, &uVertexArrayID);
    glBindVertexArray(uVertexArrayID);

    glGenBuffers(1, &uVertexBufferID);
    glBindBuffer(GL_ARRAY_BUFFER, uVertexBufferID);
    glBufferData(GL_ARRAY_BUFFER, uVerticesSize, (void *)lpfVertices, GL_STATIC_DRAW);
    glVertexAttribPointer(0, 3, GL_FLOAT, false, 0, NULL);
    glEnableVertexAttribArray(0);

    glGenBuffers(1, &uElemetsListID);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, uElemetsListID);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, uNumElements, lpbElementsList, GL_STATIC_DRAW);
}

渲染我的对象的函数:

void Object::renderObject() {
    glBindVertexArray(uVertexArrayID);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, uElemetsListID);
    glDrawElements(GL_TRIANGLES, uNumElements, GL_BYTE, NULL);
}

部分主要代码:

object.loadObject(lpfTriangleVertices, sizeof(lpfTriangleVertices), lpbElementsList, sizeof(lpbElementsList));

uProgID = loadShader("default.vs", "default.fs");

while(!glfwWindowShouldClose(lpstWndID)) {
    glfwPollEvents();

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glUseProgram(uProgID);

    object.renderObject();

    glfwSwapBuffers(lpstWndID);
}

Answer 1

glDrawElements(GL_TRIANGLES, uNumElements, GL_BYTE, NULL);
                                           ^^^^^^^

GL_BYTE不是typein 的有效参数glDrawElements():

type

指定值的类型indices.必须是一个 GL_UNSIGNED_BYTE,GL_UNSIGNED_SHORT或GL_UNSIGNED_INT.