Added RenderBuffer class (Usables with RenderTexture)

Former-commit-id: f32a2d5e5018ce3b1d41db87aec6fa910c8183a3

src/Nazara/Renderer/RenderBuffer.cpp

@@ -0,0 +1,116 @@
+// Copyright (C) 2013 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Renderer module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Renderer/RenderBuffer.hpp>
+#include <Nazara/Core/Error.hpp>
+#include <Nazara/Renderer/Context.hpp>
+#include <Nazara/Renderer/OpenGL.hpp>
+#include <Nazara/Utility/PixelFormat.hpp>
+#include <Nazara/Renderer/Debug.hpp>
+
+NzRenderBuffer::NzRenderBuffer() :
+m_id(0)
+{
+}
+
+NzRenderBuffer::~NzRenderBuffer()
+{
+	Destroy();
+}
+
+bool NzRenderBuffer::Create(nzPixelFormat format, unsigned int width, unsigned int height)
+{
+	Destroy();
+
+	#if NAZARA_RENDERER_SAFE
+	if (width == 0 || height == 0)
+	{
+		NazaraError("Invalid size");
+		return false;
+	}
+
+	if (!NzPixelFormat::IsValid(format))
+	{
+		NazaraError("Invalid pixel format");
+		return false;
+	}
+	#endif
+
+	NzOpenGL::Format openglFormat;
+	if (!NzOpenGL::TranslateFormat(format, &openglFormat, NzOpenGL::FormatType_RenderBuffer))
+	{
+		NazaraError("Failed to translate pixel format \"" + NzPixelFormat::ToString(format) + "\" into OpenGL format");
+		return false;
+	}
+
+	GLuint renderBuffer = 0;
+
+	glGenRenderbuffers(1, &renderBuffer);
+	if (!renderBuffer)
+	{
+		NazaraError("Failed to create renderbuffer");
+		return false;
+	}
+
+	GLint previous;
+	glGetIntegerv(GL_RENDERBUFFER_BINDING, &previous);
+
+	glBindRenderbuffer(GL_RENDERBUFFER, renderBuffer);
+	glRenderbufferStorage(GL_RENDERBUFFER, openglFormat.internalFormat, width, height);
+
+	if (previous != 0)
+		glBindRenderbuffer(GL_RENDERBUFFER, previous);
+
+	m_pixelFormat = format;
+	m_height = height;
+	m_id = renderBuffer;
+	m_width = width;
+
+	NotifyCreated();
+	return true;
+}
+
+void NzRenderBuffer::Destroy()
+{
+	if (m_id)
+	{
+		NotifyDestroy();
+
+		NzContext::EnsureContext();
+
+		GLuint renderBuffer = m_id;
+		glDeleteRenderbuffers(1, &renderBuffer); // Les Renderbuffers sont partagés entre les contextes: Ne posera pas de problème
+		m_id = 0;
+	}
+}
+
+unsigned int NzRenderBuffer::GetHeight() const
+{
+	return m_height;
+}
+
+nzPixelFormat NzRenderBuffer::GetFormat() const
+{
+	return m_pixelFormat;
+}
+
+unsigned int NzRenderBuffer::GetWidth() const
+{
+	return m_width;
+}
+
+unsigned int NzRenderBuffer::GetOpenGLID() const
+{
+	return m_id;
+}
+
+bool NzRenderBuffer::IsValid() const
+{
+	return m_id != 0;
+}
+
+bool NzRenderBuffer::IsSupported()
+{
+	return NzOpenGL::IsSupported(nzOpenGLExtension_FrameBufferObject);
+}