OpenGL: Implement VAOs

src/Nazara/OpenGLRenderer/OpenGLVaoCache.cpp

@@ -0,0 +1,78 @@
+// Copyright (C) 2020 Jérôme Leclercq
+// This file is part of the "Nazara Engine - OpenGL Renderer"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/OpenGLRenderer/OpenGLVaoCache.hpp>
+#include <Nazara/OpenGLRenderer/Wrapper/VertexArray.hpp>
+#include <Nazara/OpenGLRenderer/Debug.hpp>
+
+namespace Nz::GL
+{
+	OpenGLVaoCache::OpenGLVaoCache(Context& context) :
+	m_context(context)
+	{
+	}
+
+	OpenGLVaoCache::~OpenGLVaoCache() = default;
+
+	void OpenGLVaoCache::Clear()
+	{
+		m_vertexArrays.clear();
+	}
+
+	const VertexArray& OpenGLVaoCache::Get(const OpenGLVaoSetup& setup) const
+	{
+		auto it = m_vertexArrays.find(setup);
+		if (it == m_vertexArrays.end())
+		{
+			VertexArray vao = VertexArray::Build(m_context, [&]
+			{
+				if (setup.indexBuffer != 0)
+					m_context.BindBuffer(BufferTarget::ElementArray, setup.indexBuffer, true);
+
+				std::size_t bindingIndex = 0;
+				for (const auto& attribOpt : setup.vertexAttribs)
+				{
+					if (attribOpt)
+					{
+						const auto& attrib = attribOpt.value();
+
+						assert(attrib.vertexBuffer != 0);
+						m_context.BindBuffer(BufferTarget::Array, attrib.vertexBuffer, true);
+
+						m_context.glEnableVertexAttribArray(bindingIndex);
+						m_context.glVertexAttribPointer(bindingIndex, attrib.size, attrib.type, attrib.normalized, attrib.stride, attrib.pointer);
+					}
+
+					bindingIndex++;
+				}
+			});
+
+			it = m_vertexArrays.emplace(setup, std::make_unique<VertexArray>(std::move(vao))).first;
+		}
+
+		return *it->second;
+	}
+
+	void OpenGLVaoCache::NotifyBufferDestruction(GLuint buffer)
+	{
+		for (auto it = m_vertexArrays.begin(); it != m_vertexArrays.end();)
+		{
+			const OpenGLVaoSetup& setup = it->first;
+
+			// If a VAO is based on at least one of these buffers, delete it
+			auto FindVertexBuffer = [&](const auto& attribOpt)
+			{
+				if (!attribOpt)
+					return false;
+
+				return attribOpt->vertexBuffer == buffer;
+			};
+
+			if (setup.indexBuffer == buffer || std::any_of(setup.vertexAttribs.begin(), setup.vertexAttribs.end(), FindVertexBuffer))
+				it = m_vertexArrays.erase(it);
+			else
+				++it;
+		}
+	}
+}

src/Nazara/OpenGLRenderer/Wrapper/Win32/WGLContext.cpp

@@ -48,6 +48,7 @@ namespace Nz::GL
 	{
 		if (m_handle)
 		{
+			OnContextRelease();
 			NotifyContextDestruction(this);
 
 			m_loader.wglDeleteContext(m_handle);