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authorDan Goodliffe <dan@randomdan.homeip.net>2024-08-11 19:32:23 +0100
committerDan Goodliffe <dan@randomdan.homeip.net>2024-08-11 19:32:23 +0100
commit064864eac61e936af909470fcccc5c67ef6d3169 (patch)
tree079ebd953589207cf70b87648eedd543013b078a /gfx/models
parentUse texture alpha in shadow stencil (diff)
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Calculate centre and size of mesh, wrap it all in a Dimensions object
Diffstat (limited to 'gfx/models')
-rw-r--r--gfx/models/mesh.cpp27
-rw-r--r--gfx/models/mesh.h51
2 files changed, 49 insertions, 29 deletions
diff --git a/gfx/models/mesh.cpp b/gfx/models/mesh.cpp
index 1b6ecda..2eae160 100644
--- a/gfx/models/mesh.cpp
+++ b/gfx/models/mesh.cpp
@@ -1,10 +1,33 @@
#include "mesh.h"
-MeshBase::MeshBase(GLsizei m_numIndices, GLenum mode, std::pair<RelativePosition3D, RelativePosition3D> minmax) :
- m_numIndices {m_numIndices}, mode {mode}, min {minmax.first}, max {minmax.second}
+MeshBase::MeshBase(GLsizei m_numIndices, GLenum mode, const std::vector<RelativePosition3D> & positions) :
+ m_numIndices {m_numIndices}, mode {mode}, dimensions {positions}
{
}
+MeshBase::Dimensions::Dimensions(const std::span<const RelativePosition3D> positions) :
+ Dimensions {positions, {extents(positions, 0), extents(positions, 1), extents(positions, 2)}}
+{
+}
+
+MeshBase::Dimensions::Dimensions(
+ const std::span<const RelativePosition3D> positions, const std::array<Extents1D, 3> & extents1ds) :
+ minExtent(extents1ds[0].min, extents1ds[1].min, extents1ds[2].min),
+ maxExtent(extents1ds[0].max, extents1ds[1].max, extents1ds[2].max), centre {(minExtent + maxExtent) / 2.0F},
+ size {std::ranges::max(positions | std::views::transform([this](const auto & v) {
+ return glm::distance(v, centre);
+ }))}
+{
+}
+
+MeshBase::Dimensions::Extents1D
+MeshBase::Dimensions::extents(const std::span<const RelativePosition3D> positions, glm::length_t D)
+{
+ return std::ranges::minmax(positions | std::views::transform([D](const auto & v) {
+ return v[D];
+ }));
+}
+
void
MeshBase::Draw() const
{
diff --git a/gfx/models/mesh.h b/gfx/models/mesh.h
index f6a1bd2..8791aed 100644
--- a/gfx/models/mesh.h
+++ b/gfx/models/mesh.h
@@ -4,6 +4,7 @@
#include "gfx/gl/vertexArrayObject.h"
#include <glArrays.h>
#include <glad/gl.h>
+#include <ranges>
#include <span>
#include <stdTypeDefs.h>
@@ -11,35 +12,46 @@ class Vertex;
class MeshBase {
public:
+ class Dimensions {
+ public:
+ using Extents1D = std::ranges::minmax_result<RelativeDistance>;
+ explicit Dimensions(const std::span<const RelativePosition3D>);
+
+ RelativePosition3D minExtent, maxExtent;
+ RelativePosition3D centre;
+ RelativeDistance size;
+
+ private:
+ Dimensions(const std::span<const RelativePosition3D>, const std::array<Extents1D, 3> &);
+ static Extents1D extents(const std::span<const RelativePosition3D>, glm::length_t D);
+ };
+
void Draw() const;
void DrawInstanced(GLuint vao, GLsizei count, GLuint base = 0) const;
- auto
- minExtent() const
+ [[nodiscard]] const Dimensions &
+ getDimensions() const
{
- return min;
- }
-
- auto
- maxExtent() const
- {
- return max;
+ return dimensions;
}
protected:
- MeshBase(GLsizei m_numIndices, GLenum mode, std::pair<RelativePosition3D, RelativePosition3D> minmax);
+ MeshBase(GLsizei m_numIndices, GLenum mode, const std::vector<RelativePosition3D> &);
glVertexArray m_vertexArrayObject;
glBuffers<2> m_vertexArrayBuffers;
GLsizei m_numIndices;
GLenum mode;
- RelativePosition3D min, max;
+ Dimensions dimensions;
};
template<typename V> class MeshT : public MeshBase, public ConstTypeDefs<MeshT<V>> {
public:
MeshT(const std::span<const V> vertices, const std::span<const unsigned int> indices, GLenum mode = GL_TRIANGLES) :
- MeshBase {static_cast<GLsizei>(indices.size()), mode, extent(vertices)}
+ MeshBase {static_cast<GLsizei>(indices.size()), mode,
+ materializeRange(vertices | std::views::transform([](const auto & v) {
+ return static_cast<RelativePosition3D>(v.pos);
+ }))}
{
VertexArrayObject::data(vertices, m_vertexArrayBuffers[0], GL_ARRAY_BUFFER);
VertexArrayObject::data(indices, m_vertexArrayBuffers[1], GL_ARRAY_BUFFER);
@@ -51,21 +63,6 @@ public:
{
return vao.addAttribsFor<V>(m_vertexArrayBuffers[0]).addIndices(m_vertexArrayBuffers[1]);
}
-
- static auto
- extent(const std::span<const V> vertices)
- {
- std::pair<decltype(V::pos), decltype(V::pos)> out {};
- for (glm::length_t D {}; D < 3; ++D) {
- const auto mm
- = std::minmax_element(vertices.begin(), vertices.end(), [D](const auto & va, const auto & vb) {
- return va.pos[D] < vb.pos[D];
- });
- out.first[D] = mm.first->pos[D];
- out.second[D] = mm.second->pos[D];
- }
- return out;
- }
};
using Mesh = MeshT<Vertex>;