OpenGL错误处理

glGetError()

GLenum error = glGetError()会返回错误码，利用此机制，配合C++的宏，写一个简易的错误处理warp

#define ASSERT(x) if(!(x)) __debugbreak();
#define GLCall(x) GLClearError();\
    x;\
    ASSERT(GLLogCall(#x, __FILE__, __LINE__));

static void GLClearError()
{
    while (glGetError() != GL_NO_ERROR);
}

static bool GLLogCall(const char* function, const char* file, int line)
{
    while (GLenum error = glGetError())
    {
        std::cout << "[OpenGL Error](" << error << "): " << function <<
            " " << file << ":" << line << std::endl;
        return false;
    }
    return true;
}
//使用例子
GLuint buffer;
GLCall(glGenBuffers(1, &buffer)); //其实buffer里面存的是句柄
GLCall(glBindBuffer(GL_ARRAY_BUFFER, buffer));
GLCall(glBufferData(GL_ARRAY_BUFFER, 4 * 2 * sizeof(float), positions, GL_STATIC_DRAW));

GLCall(glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, nullptr));