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Triangle normals and lighting are computed inside the fragment shader for the multi-material painting gizmo.

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It results in a six-fold reduction of the amount of data transferred into GPU because there is no need to duplicate vertices for every triangle. Also, normals aren't needed to be transferred to GPU.
This commit is contained in:
Lukáš Hejl 2021-06-25 18:09:53 +02:00
parent a467d0e30e
commit 6194e67e68
4 changed files with 233 additions and 68 deletions
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68
src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.hpp
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@ -5,13 +5,68 @@
namespace Slic3r::GUI {
class GLMmSegmentationGizmo3DScene
{
public:
GLMmSegmentationGizmo3DScene() = delete;
explicit GLMmSegmentationGizmo3DScene(size_t triangle_indices_buffers_count)
{
this->triangle_indices = std::vector<std::vector<int>>(triangle_indices_buffers_count);
this->triangle_indices_sizes = std::vector<size_t>(triangle_indices_buffers_count);
this->triangle_indices_VBO_ids = std::vector<unsigned int>(triangle_indices_buffers_count);
}
virtual ~GLMmSegmentationGizmo3DScene() { release_geometry(); }
[[nodiscard]] inline bool has_VBOs(size_t triangle_indices_idx) const
{
assert(triangle_indices_idx < this->triangle_indices.size());
return this->triangle_indices_VBO_ids[triangle_indices_idx] != 0;
}
// Finalize the initialization of the geometry and indices, upload the geometry and indices to OpenGL VBO objects
// and possibly releasing it if it has been loaded into the VBOs.
void finalize_geometry();
// Release the geometry data, release OpenGL VBOs.
void release_geometry();
// Finalize the initialization of the geometry, upload the geometry to OpenGL VBO objects
// and possibly releasing it if it has been loaded into the VBOs.
void finalize_vertices();
// Finalize the initialization of the indices, upload the indices to OpenGL VBO objects
// and possibly releasing it if it has been loaded into the VBOs.
void finalize_triangle_indices();
void clear()
{
this->vertices.clear();
for (std::vector<int> &ti : this->triangle_indices)
ti.clear();
for (size_t &triangle_indices_size : this->triangle_indices_sizes)
triangle_indices_size = 0;
}
void render(size_t triangle_indices_idx) const;
std::vector<float> vertices;
std::vector<std::vector<int>> triangle_indices;
// When the triangle indices are loaded into the graphics card as Vertex Buffer Objects,
// the above mentioned std::vectors are cleared and the following variables keep their original length.
std::vector<size_t> triangle_indices_sizes;
// IDs of the Vertex Array Objects, into which the geometry has been loaded.
// Zero if the VBOs are not sent to GPU yet.
unsigned int vertices_VBO_id{0};
std::vector<unsigned int> triangle_indices_VBO_ids;
};
class TriangleSelectorMmGui : public TriangleSelectorGUI {
public:
explicit TriangleSelectorMmGui(const TriangleMesh& mesh, const std::vector<std::array<float, 4>> &colors, const std::array<float, 4> &default_volume_color)
: TriangleSelectorGUI(mesh), m_colors(colors), m_default_volume_color(default_volume_color) {
// Plus 1 is because the first position is allocated for non-painted triangles.
m_iva_colors = std::vector<GLIndexedVertexArray>(colors.size() + 1);
}
// Plus 2 in the initialization of m_gizmo_scene is because the first position is allocated for non-painted triangles, and the last position is allocated for seed fill.
explicit TriangleSelectorMmGui(const TriangleMesh &mesh, const std::vector<std::array<float, 4>> &colors, const std::array<float, 4> &default_volume_color)
: TriangleSelectorGUI(mesh), m_colors(colors), m_default_volume_color(default_volume_color), m_gizmo_scene(colors.size() + 2) {}
~TriangleSelectorMmGui() override = default;
// Render current selection. Transformation matrices are supposed
@ -22,9 +77,8 @@ private:
void update_render_data();
const std::vector<std::array<float, 4>> &m_colors;
std::vector<GLIndexedVertexArray> m_iva_colors;
const std::array<float, 4> m_default_volume_color;
GLIndexedVertexArray m_iva_seed_fill;
GLMmSegmentationGizmo3DScene m_gizmo_scene;
};
class GLGizmoMmuSegmentation : public GLGizmoPainterBase