void ScanSystem::test()
{
GLuint scanbuffers[3];
glGenBuffers(3,scanbuffers);
GLuint low = ScanSystem::BATCH_ELEMENTS/2;
GLuint mid = ScanSystem::BATCH_ELEMENTS*ScanSystem::BATCH_ELEMENTS;
GLuint high = ScanSystem::BATCH_ELEMENTS*ScanSystem::BATCH_ELEMENTS*2;
size_t offsize = ScanSystem::getOffsetSize(high);
GLuint* data = new GLuint[high];
for (GLuint i = 0; i < high; i++){
data[i] = 1;
}
glNamedBufferStorageEXT(scanbuffers[0], high * sizeof(GLuint), &data[0], 0 );
glNamedBufferStorageEXT(scanbuffers[1], high * sizeof(GLuint),0, GL_MAP_READ_BIT );
glNamedBufferStorageEXT(scanbuffers[2], offsize,0,GL_MAP_READ_BIT);
delete [] data;
GLuint result;
bool needcombine;
// low
needcombine = scanData(low, scanbuffers[0], scanbuffers[1], scanbuffers[2]);
assert(needcombine == false);
result = 0;
glGetNamedBufferSubDataEXT(scanbuffers[1],sizeof(GLuint) * (low-1), sizeof(GLuint), &result);
assert(result == low);
// med
needcombine = scanData(mid, scanbuffers[0], scanbuffers[1], scanbuffers[2]);
assert(needcombine == true);
result = 0;
glGetNamedBufferSubDataEXT(scanbuffers[2],sizeof(GLuint) * (ScanSystem::BATCH_ELEMENTS-1), sizeof(GLuint), &result);
assert(result == mid);
combineWithOffsets(mid, scanbuffers[1], scanbuffers[2]);
result = 0;
glGetNamedBufferSubDataEXT(scanbuffers[1],sizeof(GLuint) * (mid-1), sizeof(GLuint), &result);
assert(result == mid);
// high
needcombine = scanData(high, scanbuffers[0], scanbuffers[1], scanbuffers[2]);
assert(needcombine == true);
combineWithOffsets(high, scanbuffers[1], scanbuffers[2]);
result = 0;
glGetNamedBufferSubDataEXT(scanbuffers[1],sizeof(GLuint) * (high-1), sizeof(GLuint), &result);
assert(result == high);
glDeleteBuffers(3,scanbuffers);
}
void BufferImplementation_DirectStateAccessEXT::getBufferSubData(const Buffer * buffer, GLintptr offset, GLsizeiptr size, GLvoid * data) const
{
glGetNamedBufferSubDataEXT(buffer->id(), offset, size, data);
}
