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Finished picking by color with a checksum in the alpha channel

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to guard against unwanted alpha blending and / or multi sampling.
This commit is contained in:
bubnikv 2019-08-07 14:15:38 +02:00
parent 2ad3c05a65
commit 2d7f478dac
10 changed files with 89 additions and 74 deletions
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45
src/slic3r/GUI/Gizmos/GLGizmoBase.cpp
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@ -29,19 +29,21 @@ GLGizmoBase::Grabber::Grabber()
color[0] = 1.0f;
color[1] = 1.0f;
color[2] = 1.0f;
color[3] = 1.0f;
}
void GLGizmoBase::Grabber::render(bool hover, float size) const
{
float render_color[3];
float render_color[4];
if (hover)
{
render_color[0] = 1.0f - color[0];
render_color[1] = 1.0f - color[1];
render_color[2] = 1.0f - color[2];
render_color[3] = color[3];
}
else
::memcpy((void*)render_color, (const void*)color, 3 * sizeof(float));
::memcpy((void*)render_color, (const void*)color, 4 * sizeof(float));
render(size, render_color, true);
}
@ -63,7 +65,7 @@ void GLGizmoBase::Grabber::render(float size, const float* render_color, bool us
if (use_lighting)
glsafe(::glEnable(GL_LIGHTING));
glsafe(::glColor3fv(render_color));
glsafe(::glColor4fv(render_color));
glsafe(::glPushMatrix());
glsafe(::glTranslated(center(0), center(1), center(2)));
@ -144,9 +146,9 @@ GLGizmoBase::GLGizmoBase(GLCanvas3D& parent, const std::string& icon_filename, u
, m_dragging(false)
, m_imgui(wxGetApp().imgui())
{
::memcpy((void*)m_base_color, (const void*)DEFAULT_BASE_COLOR, 3 * sizeof(float));
::memcpy((void*)m_drag_color, (const void*)DEFAULT_DRAG_COLOR, 3 * sizeof(float));
::memcpy((void*)m_highlight_color, (const void*)DEFAULT_HIGHLIGHT_COLOR, 3 * sizeof(float));
::memcpy((void*)m_base_color, (const void*)DEFAULT_BASE_COLOR, 4 * sizeof(float));
::memcpy((void*)m_drag_color, (const void*)DEFAULT_DRAG_COLOR, 4 * sizeof(float));
::memcpy((void*)m_highlight_color, (const void*)DEFAULT_HIGHLIGHT_COLOR, 4 * sizeof(float));
}
void GLGizmoBase::set_hover_id(int id)
@ -161,7 +163,7 @@ void GLGizmoBase::set_hover_id(int id)
void GLGizmoBase::set_highlight_color(const float* color)
{
if (color != nullptr)
::memcpy((void*)m_highlight_color, (const void*)color, 3 * sizeof(float));
::memcpy((void*)m_highlight_color, (const void*)color, 4 * sizeof(float));
}
void GLGizmoBase::enable_grabber(unsigned int id)
@ -210,7 +212,7 @@ void GLGizmoBase::update(const UpdateData& data)
on_update(data);
}
std::array<float, 3> GLGizmoBase::picking_color_component(unsigned int id) const
std::array<float, 4> GLGizmoBase::picking_color_component(unsigned int id) const
{
static const float INV_255 = 1.0f / 255.0f;
@ -220,9 +222,12 @@ std::array<float, 3> GLGizmoBase::picking_color_component(unsigned int id) const
id -= m_group_id;
// color components are encoded to match the calculation of volume_id made into GLCanvas3D::_picking_pass()
return std::array<float, 3> { (float)((id >> 0) & 0xff) * INV_255, // red
(float)((id >> 8) & 0xff) * INV_255, // green
(float)((id >> 16) & 0xff) * INV_255 }; // blue
return std::array<float, 4> {
float((id >> 0) & 0xff) * INV_255, // red
float((id >> 8) & 0xff) * INV_255, // green
float((id >> 16) & 0xff) * INV_255, // blue
float(picking_checksum_alpha_channel(id & 0xff, (id >> 8) & 0xff, (id >> 16) & 0xff))* INV_255 // checksum for validating against unwanted alpha blending and multi sampling
};
}
void GLGizmoBase::render_grabbers(const BoundingBoxf3& box) const
@ -247,10 +252,11 @@ void GLGizmoBase::render_grabbers_for_picking(const BoundingBoxf3& box) const
{
if (m_grabbers[i].enabled)
{
std::array<float, 3> color = picking_color_component(i);
std::array<float, 4> color = picking_color_component(i);
m_grabbers[i].color[0] = color[0];
m_grabbers[i].color[1] = color[1];
m_grabbers[i].color[2] = color[2];
m_grabbers[i].color[3] = color[3];
m_grabbers[i].render_for_picking(mean_size);
}
}
@ -267,5 +273,20 @@ std::string GLGizmoBase::format(float value, unsigned int decimals) const
return Slic3r::string_printf("%.*f", decimals, value);
}
// Produce an alpha channel checksum for the red green blue components. The alpha channel may then be used to verify, whether the rgb components
// were not interpolated by alpha blending or multi sampling.
unsigned char picking_checksum_alpha_channel(unsigned char red, unsigned char green, unsigned char blue)
{
// 8 bit hash for the color
unsigned char b = ((((37 * red) + green) & 0x0ff) * 37 + blue) & 0x0ff;
// Increase enthropy by a bit reversal
b = (b & 0xF0) >> 4 | (b & 0x0F) << 4;
b = (b & 0xCC) >> 2 | (b & 0x33) << 2;
b = (b & 0xAA) >> 1 | (b & 0x55) << 1;
// Flip every second bit to increase the enthropy even more.
b ^= 0x55;
return b;
}
} // namespace GUI
} // namespace Slic3r