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IOS- added a method to resize the buffer on device rotation

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This allows to keep aspect ratio when rotating to landscape, see here:
http://stackoverflow.com/questions/20326947/opengl-what-need-to-reconfig
-when-rotate-screen, and also here:
https://gamedev.stackexchange.com/questions/75965/how-do-i-reconfigure-m
y-gles-frame-buffer-after-a-rotation
This commit is contained in:
Tzach Shabtay 2017-03-22 23:30:48 -04:00
parent 2b15ae3700
commit 269c336719
1 changed files with 50 additions and 23 deletions
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73
src/OpenTK/Platform/iPhoneOS/iPhoneOSGameView.cs
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@ -553,31 +553,11 @@ namespace OpenTK.Platform.iPhoneOS
GraphicsContext.MakeCurrent(WindowInfo); GraphicsContext.MakeCurrent(WindowInfo);
gl = GLCalls.GetGLCalls(ContextRenderingApi); gl = GLCalls.GetGLCalls(ContextRenderingApi);
int oldFramebuffer = 0, oldRenderbuffer = 1; int oldFramebuffer = 0;
gl.GetInteger(All.FramebufferBindingOes, out oldFramebuffer); gl.GetInteger(All.FramebufferBindingOes, out oldFramebuffer);
gl.GetInteger(All.RenderbufferBindingOes, out oldRenderbuffer); gl.GenFramebuffers(1, out framebuffer);
gl.GenRenderbuffers(1, out renderbuffer); CreateFrameBuffer(eaglLayer);
gl.BindRenderbuffer(All.RenderbufferOes, renderbuffer);
if (!EAGLContext.RenderBufferStorage((uint) All.RenderbufferOes, eaglLayer)) {
gl.DeleteRenderbuffers(1, ref renderbuffer);
renderbuffer = 0;
gl.BindRenderbuffer(All.RenderbufferBindingOes, oldRenderbuffer);
throw new InvalidOperationException("Error with EAGLContext.RenderBufferStorage!");
}
gl.GenFramebuffers (1, out framebuffer);
gl.BindFramebuffer (All.FramebufferOes, framebuffer);
gl.FramebufferRenderbuffer (All.FramebufferOes, All.ColorAttachment0Oes, All.RenderbufferOes, renderbuffer);
Size newSize = new Size(
(int) Math.Round(eaglLayer.Bounds.Size.Width),
(int) Math.Round(eaglLayer.Bounds.Size.Height));
Size = newSize;
gl.Viewport(0, 0, newSize.Width, newSize.Height);
gl.Scissor(0, 0, newSize.Width, newSize.Height);
frameBufferWindow = new WeakReference(Window); frameBufferWindow = new WeakReference(Window);
frameBufferLayer = new WeakReference(Layer); frameBufferLayer = new WeakReference(Layer);
@ -609,6 +589,53 @@ namespace OpenTK.Platform.iPhoneOS
gl = null; gl = null;
} }
/// <summary>
/// Resizes the frame buffer.
/// On IOS, when the device is rotated from portrait to landscape, if the framebuffer is not recreated
/// then the EAGLContext will stretch the render buffer to fit the screen.
/// If you care at all about aspect ratio, then this behavior is not desired, and in that case this method
/// should be called when rotating the device.
/// See here: http://stackoverflow.com/questions/20326947/opengl-what-need-to-reconfig-when-rotate-screen
/// And also here: https://gamedev.stackexchange.com/questions/75965/how-do-i-reconfigure-my-gles-frame-buffer-after-a-rotation
/// </summary>
public void ResizeFrameBuffer()
{
MakeCurrent();
gl.DeleteRenderbuffers(1, ref renderbuffer);
CAEAGLLayer eaglLayer = (CAEAGLLayer)Layer;
CreateFrameBuffer(eaglLayer);
}
void CreateFrameBuffer(CAEAGLLayer eaglLayer)
{
int oldRenderbuffer = 1;
gl.GetInteger(All.RenderbufferBindingOes, out oldRenderbuffer);
gl.GenRenderbuffers(1, out renderbuffer);
gl.BindRenderbuffer(All.RenderbufferOes, renderbuffer);
if (!EAGLContext.RenderBufferStorage((uint)All.RenderbufferOes, eaglLayer))
{
gl.DeleteRenderbuffers(1, ref renderbuffer);
renderbuffer = 0;
gl.BindRenderbuffer(All.RenderbufferBindingOes, oldRenderbuffer);
throw new InvalidOperationException("Error with EAGLContext.RenderBufferStorage!");
}
gl.BindFramebuffer(All.FramebufferOes, framebuffer);
gl.FramebufferRenderbuffer(All.FramebufferOes, All.ColorAttachment0Oes, All.RenderbufferOes, renderbuffer);
Size newSize = new Size(
(int)Math.Round(eaglLayer.Bounds.Size.Width),
(int)Math.Round(eaglLayer.Bounds.Size.Height));
Size = newSize;
gl.Viewport(0, 0, newSize.Width, newSize.Height);
gl.Scissor(0, 0, newSize.Width, newSize.Height);
}
public virtual void Close() public virtual void Close()
{ {
AssertValid(); AssertValid();