Large OpenGL Object handling overhaul

engine/NBGraphics/src/VertexArray.cpp

@@ -0,0 +1,222 @@
+#include "VertexArray.hpp"
+
+namespace nb {
+
+using VAOErrorCodes = VAOError::Codes;
+const std::string VAOError::type = "nb::VAOError";
+const ErrorCodeMap VAOError::ErrorMessages = {
+    { VAOErrorCodes::UNDEFINED, "Error" },
+    { VAOErrorCodes::INVALID_ATTRIBUTE, "Targeting invalid attribute"},
+    { VAOErrorCodes::INVALID_VAO, "Targeting invalid VAO" }
+};
+
+VAO::VAO(const VertexAttributePointerList& attr_ptrs) {
+    attributes(attr_ptrs);
+}
+
+VAO::VAO(VAO&& other) {
+    *this = std::move(other);
+}
+
+VAO& VAO::operator=(VAO&& rhs) {
+    _id = rhs._id;
+    _attrs = rhs._attrs;
+
+    rhs._id = 0;
+    rhs._attrs = {};
+
+    return *this;
+}
+
+VertexAttributePointerList VAO::attributes() const {
+    return _attrs;
+}
+
+VertexAttributePointerList VAO::attributes(const VertexAttributePointerList& attrs_) {
+    declare();
+    disable();
+    _attrs = attrs_;
+    bind();
+    for (auto attr_ptr : attrs_) {
+        attr_ptr.buffer->bind();
+        GLuint idx = attr_ptr.index; 
+        glVertexAttribPointer(
+            idx,
+            attr_ptr.attribute.GLSLSize,
+            attr_ptr.attribute.GLSLType,
+            attr_ptr.attribute.GLSLNormalization,
+            attr_ptr.attribute.layout.stride,
+            (void*)attr_ptr.attribute.layout.offset
+        );
+        glEnableVertexAttribArray(idx);
+    }
+    unbind();
+    return _attrs;
+}
+
+VertexAttributePointer VAO::attr(GLuint idx) const {
+    for (auto attr_ptr : _attrs) {
+        if (idx == attr_ptr.index) {
+            return attr_ptr;
+        }
+    }
+    THROW(BufferError(Codes::INVALID_ATTRIBUTE));
+}
+
+void VAO::enable() const {
+    if (_id) {
+        bind();
+        for(auto attr_ptr : _attrs) {
+            glEnableVertexAttribArray(attr_ptr.index);
+        }
+        unbind();
+    }
+}
+
+void VAO::enable(GLuint idx) const {
+    if(_id) {
+        bind();
+        glEnableVertexAttribArray(attr(idx).index); 
+        unbind();
+    }
+}
+
+void VAO::disable() const {
+    if(_id) {
+        bind();
+        for(auto attr_ptr : _attrs) {
+            glDisableVertexAttribArray(attr_ptr.index); 
+        }
+        unbind();
+    }
+}
+
+void VAO::disable(GLuint idx) const {
+    if(_id) {
+        bind();
+        glDisableVertexAttribArray(attr(idx).index); 
+        unbind();
+    }
+}
+
+VertexGroup::VertexGroup(VertexGroup&& other) {
+    *this = std::move(other);
+}
+
+VertexGroup& VertexGroup::operator=(VertexGroup&& rhs) {
+    _vertex_data = rhs._vertex_data;
+    _elmt_buf = std::move(rhs._elmt_buf);
+    _vao = std::move(rhs._vao);
+
+    rhs._vertex_data = {};
+    rhs._elmt_buf = ElementBuffer<false>();
+    rhs._vao = VAO();
+
+    return *this;
+}
+
+size_t VertexGroup::buffer(VertexBuffer<false>&& buf_) {
+    _vertex_data.emplace_back(
+        std::make_shared<VertexBuffer<false>>(std::move(buf_))
+    );
+    VertexBuffer<false>* buf_ptr  = _vertex_data.back().get();
+    VertexAttributePointerList attrs = _vao.attributes();
+    GLuint idx = attrs.size();
+    for (auto attr : buf_ptr->attributes) {
+        attrs.emplace_back(
+            VertexAttributePointer{attr, buf_ptr,idx}
+        );
+        idx++;
+    }
+    _vao.attributes(attrs);
+    return _vertex_data.size();
+}
+
+VertexBuffer<false>& VertexGroup::buffer(size_t idx) {
+    return *_vertex_data[idx];
+}
+
+std::vector<std::shared_ptr<VertexBuffer<false>>> VertexGroup::buffers() {
+    return _vertex_data;
+}
+
+size_t VertexGroup::buffers(std::vector<VertexBuffer<false>>&& bufs_) {
+    _vertex_data = {};
+    for (auto& buf : bufs_) {
+        _vertex_data.emplace_back(
+            std::make_shared<VertexBuffer<false>>(std::move(buf))
+        );
+    }
+    VertexAttributePointerList attr_ptrs;
+    GLuint idx = 0;
+    for (auto buf : _vertex_data) {
+        for (auto attr : buf->attributes) {
+            attr_ptrs.emplace_back(
+                VertexAttributePointer{attr, buf.get(), idx}
+            );
+            idx++;
+        }
+    }
+    _vao.attributes(attr_ptrs);
+    return _vertex_data.size();
+}
+
+VertexBuffer<false>&& VertexGroup::dropBuffer(size_t idx) {
+    if (idx >= _vertex_data.size()) {
+        THROW(BufferError(BufferError::Codes::INVALID_BUFFER));
+    }
+    std::vector<VertexBuffer<false>> tmp;
+    for (auto buf : _vertex_data) {
+        tmp.emplace_back(std::move(*buf));
+    }
+    _vertex_data.clear();
+    std::shared_ptr<VertexBuffer<false>> ret_ptr = 
+        std::make_shared<VertexBuffer<false>>(std::move(tmp[idx]));
+    tmp.erase(tmp.begin()+idx);
+    buffers(std::move(tmp));
+    return std::move(*ret_ptr);
+}
+
+VertexAttributePointer VertexGroup::attribute(size_t idx_) const {
+    return _vao.attr(idx_);
+}
+
+void VertexGroup::enableAttr(GLuint idx) {
+    bind();
+    _vao.enable(idx);
+    unbind();
+}
+
+void VertexGroup::disableAttr(GLuint idx) {
+    bind();
+    _vao.disable(idx);
+    unbind();
+}
+
+void VertexGroup::disableBuffer(size_t idx) {
+    auto buf_ptr = _vertex_data[idx].get();
+    bind();
+    for (auto attr : _vao.attributes()) {
+        if (attr.buffer == buf_ptr) {
+            _vao.disable(attr.index);
+        }
+    }
+    unbind();
+}
+
+void VertexGroup::enableBuffer(size_t idx) {
+    auto buf_ptr = _vertex_data[idx].get();
+    bind();
+    for (auto attr : _vao.attributes()) {
+        if (attr.buffer == buf_ptr) {
+            _vao.enable(attr.index);
+        }
+    }
+    unbind();
+}
+
+void VertexGroup::enable() { _vao.enable(); }
+
+void VertexGroup::disable() { _vao.disable(); }
+
+} // namespace nb