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feat(render): a geometry chunk emptied in place, the kind of its primitive told; a chunk gaining or losing its userdata gets a new buffer

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Erase() empties a chunk and keeps its handle to be filled again, for geometry made anew as it changes. Primitive() tells whether a chunk holds triangles or strips, -1 from a renderer which doesn't know. The VAO bank reused the buffer of a chunk of the same length even when the userdata came or went, the layout of the buffer differing then.
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maj00r
2026-11-03 21:50:31 +01:00
parent 823807201c
commit a24118baf7
8 changed files with 88 additions and 2 deletions
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8
rendering/renderer.h
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@@ -59,16 +59,24 @@ public:
virtual auto Replace(gfx::vertex_array &Vertices, gfx::userdata_array &Userdata, gfx::geometry_handle const &Geometry, int const Type, const std::size_t Offset = 0) -> bool = 0;
// adds supplied vertex data at the end of specified chunk
virtual auto Append(gfx::vertex_array &Vertices, gfx::userdata_array &Userdata, gfx::geometry_handle const &Geometry, int const Type) -> bool = 0;
// empties specified chunk, its handle stays valid to be filled again
virtual void Erase( gfx::geometry_handle const &Geometry ) {}
// provides direct access to index data of specfied chunk
virtual auto Indices( gfx::geometry_handle const &Geometry ) const->gfx::index_array const & = 0;
// provides direct access to vertex data of specfied chunk
virtual auto Vertices( gfx::geometry_handle const &Geometry ) const ->gfx::vertex_array const & = 0;
// provides direct access to vertex user data of specfied chunk
virtual auto UserData( gfx::geometry_handle const &Geometry ) const ->gfx::userdata_array const & = 0;
// kind of geometry of specified chunk, -1 when the renderer doesn't tell
virtual auto Primitive( gfx::geometry_handle const &Geometry ) const -> int { return -1; }
// material methods
virtual auto Fetch_Material( std::string const &Filename, bool const Loadnow = true ) -> material_handle = 0;
virtual void Bind_Material( material_handle const Material, TSubModel const *sm = nullptr, lighting_data const *lighting = nullptr ) = 0;
virtual auto Material( material_handle const Material ) const -> IMaterial const * = 0;
// the same material with its highlights damped, for faces which aren't polished like the surfaces they are cut from. backends which can't make one give back the material itself
virtual auto Matte_Material( material_handle const Material ) -> material_handle { return Material; }
// the same material with its texture tinted by the colour, as far as the userdata of the vertices says. backends which can't make one give back the material itself
virtual auto Tinted_Material( material_handle const Material, glm::vec3 const &Colour ) -> material_handle { return Material; }
// heightmap terrain: material of a chunk blending the materials of up to 8 layers by their weights.
// Weights: (Samples + 1)^2 values per layer, planar, rows of growing z, the weights of a sample adding up to 255; null with a single layer.
// Placement: corner of the chunk (x, z) in the texture coordinates of its mesh, and the size of the chunk.