3DPrinting/PrusaSlicer-NonPlainar
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WIP: Picking fix - disable alpha blending and render with false colors

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including the alpha channels, which have their 3 lowest bits set to zero.
In case some blending occurs, the lowest 3 bits will likely be used
to interpolate between the false colors, therefore the 3 lowest bits
may be used to detect alpha blending or multi-sampling.
This commit is contained in:
bubnikv 2019-08-07 11:14:04 +02:00
parent 2f642ffffb
commit a58b1844e0
1 changed files with 31 additions and 42 deletions
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73
src/slic3r/GUI/GLCanvas3D.cpp
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@ -3764,6 +3764,7 @@ void GLCanvas3D::_picking_pass() const
// Better to use software ray - casting on a bounding - box hierarchy.
if (m_multisample_allowed)
// This flag is often ignored by NVIDIA drivers if rendering into a screen buffer.
glsafe(::glDisable(GL_MULTISAMPLE));
glsafe(::glDisable(GL_BLEND));
@ -3793,7 +3794,9 @@ void GLCanvas3D::_picking_pass() const
if (inside)
{
glsafe(::glReadPixels(m_mouse.position(0), cnv_size.get_height() - m_mouse.position(1) - 1, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, (void*)color));
volume_id = color[0] + (color[1] << 8) + (color[2] << 16);
if (((color[0] | color[1] | color[2] | color[3]) & 0x7) == 0)
// Only non-interpolated colors are valid, those have their lowest three bits zeroed.
volume_id = (color[0] >> 3) + (color[1] << (5 - 3)) + (color[2] << (10 - 3)) + (color[3] << (15 - 3));
}
if ((0 <= volume_id) && (volume_id < (int)m_volumes.volumes.size()))
{
@ -3816,6 +3819,7 @@ void GLCanvas3D::_rectangular_selection_picking_pass() const
if (m_picking_enabled)
{
if (m_multisample_allowed)
// This flag is often ignored by NVIDIA drivers if rendering into a screen buffer.
glsafe(::glDisable(GL_MULTISAMPLE));
glsafe(::glDisable(GL_BLEND));
@ -3841,7 +3845,9 @@ void GLCanvas3D::_rectangular_selection_picking_pass() const
struct Pixel
{
std::array<GLubyte, 4> data;
int id() const { return data[0] + (data[1] << 8) + (data[2] << 16); }
// Only non-interpolated colors are valid, those have their lowest three bits zeroed.
bool valid() const { return ((data[0] | data[1] | data[2] | data[3]) & 0x7) == 0; }
int id() const { return (data[0] >> 3) + (data[1] << (5 - 3)) + (data[2] << (10 - 3)) + (data[3] << (15 - 3)); }
};
std::vector<Pixel> frame(px_count);
@ -3851,17 +3857,15 @@ void GLCanvas3D::_rectangular_selection_picking_pass() const
tbb::parallel_for(tbb::blocked_range<size_t>(0, frame.size(), (size_t)width),
[this, &frame, &idxs, &mutex](const tbb::blocked_range<size_t>& range) {
for (size_t i = range.begin(); i < range.end(); ++i)
{
int volume_id = frame[i].id();
if ((0 <= volume_id) && (volume_id < (int)m_volumes.volumes.size()))
{
mutex.lock();
idxs.insert(volume_id);
mutex.unlock();
}
}
}
);
if (frame[i].valid()) {
int volume_id = frame[i].id();
if ((0 <= volume_id) && (volume_id < (int)m_volumes.volumes.size())) {
mutex.lock();
idxs.insert(volume_id);
mutex.unlock();
}
}
});
#else
std::vector<GLubyte> frame(4 * px_count);
glsafe(::glReadPixels(left, top, width, height, GL_RGBA, GL_UNSIGNED_BYTE, (void*)frame.data()));
@ -4040,42 +4044,27 @@ void GLCanvas3D::_render_volumes_for_picking() const
// do not cull backfaces to show broken geometry, if any
glsafe(::glDisable(GL_CULL_FACE));
glsafe(::glEnable(GL_BLEND));
glsafe(::glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA));
glsafe(::glEnableClientState(GL_VERTEX_ARRAY));
glsafe(::glEnableClientState(GL_NORMAL_ARRAY));
const Transform3d& view_matrix = m_camera.get_view_matrix();
GLVolumeWithIdAndZList to_render = volumes_to_render(m_volumes.volumes, GLVolumeCollection::Opaque, view_matrix);
for (const GLVolumeWithIdAndZ& volume : to_render)
{
// Object picking mode. Render the object with a color encoding the object index.
unsigned int r = (volume.second.first & 0x000000FF) >> 0;
unsigned int g = (volume.second.first & 0x0000FF00) >> 8;
unsigned int b = (volume.second.first & 0x00FF0000) >> 16;
glsafe(::glColor3f((GLfloat)r * INV_255, (GLfloat)g * INV_255, (GLfloat)b * INV_255));
if (!volume.first->disabled && ((volume.first->composite_id.volume_id >= 0) || m_render_sla_auxiliaries))
volume.first->render();
}
to_render = volumes_to_render(m_volumes.volumes, GLVolumeCollection::Transparent, view_matrix);
for (const GLVolumeWithIdAndZ& volume : to_render)
{
// Object picking mode. Render the object with a color encoding the object index.
unsigned int r = (volume.second.first & 0x000000FF) >> 0;
unsigned int g = (volume.second.first & 0x0000FF00) >> 8;
unsigned int b = (volume.second.first & 0x00FF0000) >> 16;
glsafe(::glColor3f((GLfloat)r * INV_255, (GLfloat)g * INV_255, (GLfloat)b * INV_255));
if (!volume.first->disabled && ((volume.first->composite_id.volume_id >= 0) || m_render_sla_auxiliaries))
volume.first->render();
}
for (size_t type = 0; type < 2; ++ type) {
GLVolumeWithIdAndZList to_render = volumes_to_render(m_volumes.volumes, (type == 0) ? GLVolumeCollection::Opaque : GLVolumeCollection::Transparent, view_matrix);
for (const GLVolumeWithIdAndZ& volume : to_render)
if (!volume.first->disabled && ((volume.first->composite_id.volume_id >= 0) || m_render_sla_auxiliaries)) {
// Object picking mode. Render the object with a color encoding the object index.
unsigned int id = volume.second.first;
unsigned int r = (id & (0x0000001F << 0)) << 3;
unsigned int g = (id & (0x0000001F << 5)) >> (5 - 3);
unsigned int b = (id & (0x0000001F << 10)) >> (10 - 3);
unsigned int a = (id & (0x0000001F << 15)) >> (15 - 3);
glsafe(::glColor4f((GLfloat)r * INV_255, (GLfloat)g * INV_255, (GLfloat)b * INV_255, (GLfloat)a * INV_255));
volume.first->render();
}
}
glsafe(::glDisableClientState(GL_NORMAL_ARRAY));
glsafe(::glDisableClientState(GL_VERTEX_ARRAY));
glsafe(::glDisable(GL_BLEND));
glsafe(::glEnable(GL_CULL_FACE));
}