Large OpenGL Object handling overhaul

2026-08-20 08:14:28 -05:00
parent bfe020c5c6
commit 3a097df594
17 changed files with 772 additions and 588 deletions
@@ -0,0 +1,176 @@
+#pragma once
+#ifndef _NB_VERTEX_ARRAY
+#define _NB_VERTEX_ARRAY
+
+#include "GLLoad.hpp"
+
+#include <NBCore/Errors.hpp>
+
+#include "Buffers.hpp"
+#include "OGLObjects.hpp"
+
+
+namespace nb {
+
+struct VertexAttributeLayout {
+    int32_t offset = 0;
+    GLsizei stride = 0;
+    GLuint divisor = 0;
+};
+
+struct VertexAttribute {
+    GLint GLSLSize;
+    GLenum GLSLType;
+    GLboolean GLSLNormalization;
+    VertexAttributeLayout layout;
+};
+
+struct VertexAttributePointer;
+
+static bool isIndexInVertexAttribute(int i, const VertexAttribute& va) {
+    if ((i -= va.layout.offset) < 0) { return false; }
+    return (i%va.layout.stride) < GLSLTypeSize(va.GLSLType) * va.GLSLSize;
+}
+
+typedef std::vector<VertexAttribute> VertexAttributeList;
+typedef std::vector<VertexAttributePointer> VertexAttributePointerList;
+
+class VAOError : public Error<VAOError> {
+    using Base = Error<VAOError>;
+    
+    public:
+    using Base::Base;
+    
+    enum Codes : unsigned int {
+        UNDEFINED, INVALID_ATTRIBUTE, INVALID_VAO
+    };
+
+    static const std::string type;
+    static const ErrorCodeMap ErrorMessages;
+};
+
+template <bool Immutable=false>
+class VertexBuffer : public ArrayBuffer<false>{
+    using Base = ArrayBuffer<Immutable>;
+
+    public:
+    template<typename... Args>
+    VertexBuffer(const VertexAttributeList& vas, Args... args)
+    : attributes(vas) {
+        if (sizeof...(Args)) {
+            data(args...);
+        }
+    }
+
+    using Base::Target;
+    const VertexAttributeList attributes;
+
+    protected:
+    using Base::_usage;
+
+};
+
+template <>
+class VertexBuffer<true> 
+: public virtual VertexBuffer<false>, public virtual ImmutableBuffer<ArrayBuffer<true>> {
+    using Base = ArrayBuffer<false>;
+    using BufferType = ImmutableBuffer<ArrayBuffer<true>>;
+    using BufferType::BufferType;
+
+    public:
+    using Base::Target;
+
+};
+
+struct VertexAttributePointer {
+    VertexAttribute attribute;
+    VertexBuffer<false>* buffer;
+    GLuint index;
+};
+
+class VAO : public OpenGLObject {
+    using Base = OpenGLObject;
+    using Codes = VAOError::Codes;
+
+    public:
+    using Base::Base;
+    VAO() = default;
+    VAO(const VertexAttributePointerList&);
+    VAO(VAO&&);
+
+    VAO& operator=(VAO&&);
+
+    virtual void bind() const override {
+        if(_id) {
+            glBindVertexArray(_id);
+        } else {
+            THROW(Codes::INVALID_VAO);
+        }
+    }
+    virtual void unbind() const override { glBindVertexArray(0); }
+
+    VertexAttributePointerList attributes() const;
+    VertexAttributePointerList attributes(const VertexAttributePointerList&);
+    VertexAttributePointer attr(GLuint) const;
+    void enable() const;
+    void enable(GLuint) const;
+    void disable() const;
+    void disable(GLuint) const;
+
+    protected:
+    using Base::_id;
+    VertexAttributePointerList _attrs;
+
+    virtual void remove() override {
+        if(_id) {
+            disable();
+            bind();
+            glDeleteVertexArrays(1, &_id);
+            _id = 0;
+        }
+    }
+    virtual GLuint declare() override {
+        if (!_id) {
+            glGenVertexArrays(1, &_id);
+        }
+        return _id;
+    }
+
+};
+
+class VertexGroup {
+    public:
+    VertexGroup(VertexGroup&&);
+    VertexGroup& operator=(VertexGroup&&);
+
+    void bind() const {
+        _elmt_buf.bind();
+        _vao.bind();
+    }
+    void unbind() const {
+        _vao.bind();
+        _elmt_buf.unbind();
+    }
+
+    VertexBuffer<false>& buffer(size_t);
+    size_t buffer(VertexBuffer<false>&&);
+    std::vector<std::shared_ptr<VertexBuffer<false>>> buffers();
+    size_t buffers(std::vector<VertexBuffer<false>>&&);
+    VertexBuffer<false>&& dropBuffer(size_t);
+
+    VertexAttributePointer attribute(size_t) const;
+    void enableAttr(GLuint);
+    void disableAttr(GLuint);
+    void enableBuffer(size_t);
+    void disableBuffer(size_t);
+    void enable();
+    void disable();
+
+    protected:
+    std::vector<std::shared_ptr<VertexBuffer<false>>> _vertex_data;
+    ElementBuffer<false> _elmt_buf;
+    VAO _vao;
+};
+
+} // namespace nb
+#endif // _NB_VERTEX_ARRAY