// TODO Will probably need to handle resizing the framebuffer
// TODO Make internal and store
public static RenderTarget Create(int width, int height)
{
var rv = new RenderTarget();
// Create the frame buffer
GlBindings.GenFramebuffers(1, out rv.m_RanderTargetId);
GlBindings.BindFrameBuffer(OpenGL.FrameBuffer.GL_FRAMEBUFFER, rv.m_RanderTargetId);
// Attach the texture component
GlBindings.GenTextures(1, out rv.m_TextureColorBuffer);
GlBindings.BindTexture(TextureType.GL_TEXTURE_2D, rv.m_TextureColorBuffer);
GlBindings.TexImage2D(TextureType.GL_TEXTURE_2D, 0, OpenGL.PixelInternalFormat.Rgb, width, height, 0, OpenGL.PixelFormat.Rgb, OpenGL.PixelType.UnsignedByte, IntPtr.Zero);
GlBindings.TexParameteri(TextureType.GL_TEXTURE_2D, TextureAttribute.GL_TEXTURE_MIN_FILTER, TextureAttributeValue.GL_LINEAR);
GlBindings.TexParameteri(TextureType.GL_TEXTURE_2D, TextureAttribute.GL_TEXTURE_MAG_FILTER, TextureAttributeValue.GL_LINEAR);
GlBindings.glFramebufferTexture2D(FrameBuffer.GL_FRAMEBUFFER, Attachment.GL_COLOR_ATTACHMENT0, TextureType.GL_TEXTURE_2D, rv.m_TextureColorBuffer, 0);
// TODO Depth buffer!
GlBindings.glGenRenderbuffers(1, out rv.m_RenderBufferObjectId);
GlBindings.glBindRenderbuffer(RenderBuffer.GL_RENDERBUFFER, rv.m_RenderBufferObjectId);
GlBindings.glRenderbufferStorage(RenderBuffer.GL_RENDERBUFFER, InternalFormat.GL_DEPTH24_STENCIL8, width, height);
GlBindings.glFramebufferRenderbuffer(RenderBuffer.GL_FRAMEBUFFER, Attachment.GL_DEPTH_STENCIL_ATTACHMENT, RenderBuffer.GL_RENDERBUFFER, rv.RenderBufferObjectId);
if (GlBindings.glCheckFramebufferStatus(FrameBuffer.GL_FRAMEBUFFER) != (int)ReturnValue.GL_FRAMEBUFFER_COMPLETE)
{
throw new Exception("Error with framebuffer");
}
// Store previous
GlBindings.BindFrameBuffer(OpenGL.FrameBuffer.GL_FRAMEBUFFER, 0);
return(rv);
}