opengl - 如何使用 glClearBufferData 初始化缓冲区

Question

GLuint buffer;
glCreateBuffers(1, &buffer);
glNamedBufferStorage(buffer, 1024, NULL, GL_MAP_WRITE_BIT | GL_MAP_READ_BIT | GL_DYNAMIC_STORAGE_BIT);
unsigned int x = 0x01010101;
glBindBuffer(GL_ARRAY_BUFFER, buffer);

glClearBufferData(GL_ARRAY_BUFFER, GL_R32UI, GL_RED, GL_UNSIGNED_INT, &x);
int* p = (int*)glMapBuffer(GL_ARRAY_BUFFER, GL_READ_WRITE);
for (int i = 0; i < 4; ++i)
    cout << hex << p[i] << " ";
glUnmapBuffer(GL_ARRAY_BUFFER);

但是，输出是“1010102”而不是“1010101”。

标签： openglopengl-4

Answer 1

glClearBufferData(GL_ARRAY_BUFFER, GL_R32UI, GL_RED, GL_UNSIGNED_INT, &x);

正确的格式参数应该是GL_RED_INTEGER，而不是GL_RED。