OpenGL: Implement Framebuffers

src/Nazara/OpenGLRenderer/OpenGLWindowFramebuffer.cpp

@@ -0,0 +1,20 @@
+// 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/OpenGLWindowFramebuffer.hpp>
+#include <Nazara/OpenGLRenderer/OpenGLRenderWindow.hpp>
+#include <stdexcept>
+#include <Nazara/OpenGLRenderer/Debug.hpp>
+
+namespace Nz
+{
+	void OpenGLWindowFramebuffer::Activate() const
+	{
+		GL::Context& context = m_renderWindow.GetContext();
+		if (!GL::Context::SetCurrentContext(&context))
+			throw std::runtime_error("failed to bind window context");
+
+		context.BindFramebuffer(GL::FramebufferTarget::Draw, 0);
+	}
+}

src/Nazara/OpenGLRenderer/Wrapper/Context.cpp

@@ -36,6 +36,19 @@ namespace Nz::GL
 		}
 	}
 
+	void Context::BindFramebuffer(GLuint fbo) const
+	{
+		if (m_state.boundDrawFBO != fbo || m_state.boundReadFBO != fbo)
+		{
+			if (!SetCurrentContext(this))
+				throw std::runtime_error("failed to activate context");
+
+			glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+			m_state.boundDrawFBO = fbo;
+			m_state.boundReadFBO = fbo;
+		}
+	}
+
 	void Context::BindSampler(UInt32 textureUnit, GLuint sampler) const
 	{
 		if (textureUnit >= m_state.textureUnits.size())