glGetBufferSubData是否同时用于普通缓冲和纹理缓冲? 我正在尝试解决我的纹理不显示的问题,当我使用glGetBufferSubData读取缓冲区时,我得到了一些垃圾数据。
struct TypeGLtexture //Associate texture data with a GL buffer
{
TypeGLbufferID GLbuffer;
TypeImageFile ImageFile;
void GenerateGLbuffer ()
{
if (GLbuffer.isActive==true || ImageFile.GetPixelArray().size()==0) return;
GLbuffer.isActive=true;
GLbuffer.isTexture=true;
GLbuffer.Name="Texture Buffer";
GLbuffer.ElementCount=ImageFile.GetPixelArray().size();
glEnable(GL_TEXTURE_2D);
glGenTextures (1,&GLbuffer.ID); //instantiate ONE buffer object and return its handle/ID
glBindTexture (GL_TEXTURE_2D,GLbuffer.ID); //connect the object to the GL_TEXTURE_2D docking point
glTexImage2D (GL_TEXTURE_2D,0,GL_RGB,ImageFile.GetProperties().width, ImageFile.GetProperties().height,0,GL_RGB,GL_UNSIGNED_BYTE,&(ImageFile.GetPixelArray()[0]));
if(ImageFile.GetProperties().width==6){
cout<<"Actual Data"<<endl;
for (unsigned i=0;i<GLbuffer.ElementCount;i++) cout<<(int)ImageFile.GetPixelArray()[i]<<" ";
cout<<endl<<endl;
cout<<"Buffer data"<<endl;
GLubyte read[GLbuffer.ElementCount]; //Read back from the buffer (to make sure)
glGetBufferSubData(GL_TEXTURE_2D,0,GLbuffer.ElementCount,read);
for (unsigned i=0;i<GLbuffer.ElementCount;i++) cout<<(int)read[i]<<" ";
cout<<endl<<endl;}
}
编辑:
使用 glGetTexImage(GL_TEXTURE_2D,0,GL_RGB,GL_UNSIGNED_BYTE,read);
数据仍有差异: