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12to11/README
oldosfan 4d2e85d002 Implement wp_viewporter support and fix scaling for fractional values 
* 12to11.c (XLMain): Initialize wp_viewporter.
* Imakefile (ETAGS): Remove unused variable.
(SRCS, OBJS): Add wp_viewporter.c and wp_viewporter.o.
(GENHEADERS): Remove unnecessary headers.
(viewporter): New scanner target.
* README: Document support for wp_viewporter.
* compositor.h (struct _ViewportExt): New forward declaration.
(struct _DrawParams): New fields for cropping and stretching.
(struct _RenderFuncs): Describe how composite works.
(struct _BufferFuncs): Make update_buffer_for_damage take
DrawParams as an argument.
(struct _State): New fields for viewporting.
(struct _Surface): New field `viewport' and associated input
delta.
(struct _XdgRoleImplementationFuncs): New field
`is_window_mapped'.  Do not commit while unmapped.
* dmabuf.c (XLInitDmabuf): Remove outdated comment.
* dnd.c (HandleMotion): Use TruncateWindowToSurface.
* egl.c (struct _EglBuffer): Add 3x3 reverse transformation
matrix.
(struct _CompositeProgram): Rename `scale' to `source'.
(Index): New macro.
(PickBetterVisual, FindVisual): Compensate for EGL picking a
non-RGBA visual.
(EglCompileCompositeProgram): Look for source, not scale.
(ComputeTransformMatrix): New function.
(Composite): Compute transformation matrix and draw using that.
(BufferFromDmaBuf, BufferFromShm): Copy identity transform and
stop setting scale.
(ReverseTransformToBox): New function.
(UpdateShmBufferIncrementally): Accept DrawParams and invert
damage according to that.
(UpdateBuffer, UpdateBufferForDamage): Pass draw params to the
incremental buffer update function.
* fns.c (XLExtendRegion): New function.
* frame_clock.c (CurrentHighPrecisionTimestamp): Delete
function.
(HighPrecisionTimestamp, HighPrecisionTimestamp32): New
functions.
(PostEndFrame): Handle X server time truncation to 32 bits.
(XLFrameClockFreeze): Remove trailing whitespace.
* picture_renderer.c (GetSourceX, GetSourceY, CompareStretch):
New functions.
(MaybeApplyTransform): Check more values before applying
transformations.  Then, handle stretch and offset.
* positioner.c (GetAdjustmentOffset, ApplyConstraintAdjustment)
(XLPositionerCalculateGeometry): Scale coordinates using new
functions.
* renderer.c (RenderUpdateBufferForDamage): Accept DrawParams
instead of scale.
* shaders.txt (Composite Rectangle Fragment Shader RGBA)
(Composite Rectangle Fragment Shader RGBX)
(Composite Rectangle Fragment Shader External): Stop
transforming texcoords.
(Composite Rectangle Vertex Shader): Transform texcoords in the
vertex shader instead.
* subcompositor.c (IsViewported, SetViewported,
ClearViewported): New functions.
(struct _View): New fields for tracking viewports and fractional
offsets.
(ViewAttachBuffer): Do not garbage upon buffer size change if a
viewport is set.
(ViewMoveFractional): New function.
(ViewDamage): Describe what the damage is and is not transformed
by.
(GetContentScale): New function.
(ViewWidth, ViewHeight): Apply viewport.
(ViewSetScale): Use ViewAfterSizeUpdate instead of duplicating
code.
(ViewSetViewport, ViewClearViewport): New functions.
(ViewComputeTransform): Compute transform for viewports.  New
arg draw; use it to determine whether or not to include a
fractional offset.
(IntersectBoxes): Fix intersection calculation.
(SubcompositorUpdate): Don't keep calling ViewWidth and
ViewHeight in a loop.
(SubcompositorExpose): Adjust for changes to buffer damage
uploading.
* subsurface.c (MoveFractional): New function.  Handle
fractional offsets after scaling.
(MaybeUpdateOutputs, AfterParentCommit, Setup, Rescale): Use
that function to move the subsurface instead.
* surface.c (ApplyScale): Update comment.
(ApplyViewport, CheckViewportValues): New functions.
(HandleScaleChanged): Apply the viewport as well upon scale
change.
(ApplyDamage): Improve damage calculation for viewported
surfaces.
(SavePendingState, InternalCommit): Save and commit viewport
state; check old values upon buffer commit.
(InitState): Initialize viewport to initial values.
(XLSurfaceRunFrameCallbacks): Handle overflows of 32-bit time at
the 49-day mark.
(SurfaceToWindow, ScaleToWindow, WindowToSurface, ScaleToSurface)
(TruncateScaleToWindow, TruncateScaleToWindow)
(TruncateWindowToSurface, TruncateScaleToSurface): New functions
for handling scale.
* xdg_popup.c (MoveWindow, IsWindowMapped, XLGetXdgPopup):
* xdg_surface.c (IsRoleMapped, Commit, Subframe)
(GetResizeDimensions, XLXdgRoleCalcNewWindowSize):
* xdg_toplevel.c (IsWindowMapped, NoteConfigureTime, SendStates)
(RecordStateSize, HandleWindowGeometryChange, NoteWindowPreResize)
(XLGetXdgToplevel): Use them instead of manually multiplying
with the factor.
2022-09-30 01:17:47 +00:00

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This is a tool for running Wayland applications on an X server,
preferably with a compositing manager running.
It is not yet complete. What is not yet implemented includes support
for touchscreens, input methods, device switching in dmabuf feedback,
and the single-pixel buffer protocol extension.
There are also problems with output reporting in subsurfaces.
It is not portable to systems other than recent versions of GNU/Linux
running the X.Org server 1.20 or later, and has not been tested on
window (and compositing) managers other than GNOME Shell.
It will not work very well unless the compositing manager supports the
EWMH frame synchronization protocol.
Building and running this tool requires the following X protocol
extensions:
Nonrectangular Window Shape Extension, version 1.1 or later
MIT Shared Memory Extension, version 1.2 or later
X Resize, Rotate and Reflect Extension, version 1.3 or later
(this will soon be 1.4, once support for multiple GPU
systems is fully implemented)
X Synchronization Extension, version 1.0 or later
X Rendering Extension, version 1.2 or later
X Input Extension, version 2.3 or later
Direct Rendering Interface 3, version 1.2 or later
X Fixes Extension, version 1 or later
In addition, it requires Xlib to be built with the XCB transport, and
the XCB bindings for MIT-SHM and DRI3 to be available.
Sometimes, it might be desirable to build with EGL, and use OpenGL ES
2.0 for i.e. YUV video format support. To do so, uncomment the block
of code for EGL support in libraries.def before running `xmkmf'. This
will additionally require the EGL and GLESv2 development files, and
for the following EGL and GLES extensions to be present at runtime:
EGL_EXT_platform_base
EGL_EXT_device_query
EGL_KHR_image_base
EGL_EXT_image_dma_buf_import_modifiers
EGL_EXT_image_dma_buf_import
EGL_EXT_buffer_age
GL_OES_EGL_image
GL_OES_EGL_image_external
GL_EXT_read_format_bgra
GL_EXT_unpack_subimage
After building with EGL support, the renderer must be enabled by
setting the environment variable "RENDERER" to "egl".
The following Wayland protocols are implemented to a more-or-less
complete degree:
'wl_output', version: 2
'wl_compositor', version: 5
'wl_shm', version: 1
'xdg_wm_base', version: 5
'wl_subcompositor', version: 1
'wl_seat', version: 7
'wl_data_device_manager', version: 3
'zwp_linux_dmabuf_v1', version: 4
'zwp_primary_selection_device_manager_v1', version: 1
'wp_viewporter', version: 1
When built with EGL, the following Wayland protocol is also supported:
'zwp_linux_explicit_synchronization_v1', version: 2
With the main caveat being that zwp_linux_dmabuf_v1 has no real
support for multiple-provider setups (help wanted).
Window decorations are also not supported, even though they fit in
nicely with X window management.
It would also be nice to have pinch gesture support.
This directory is organized as follows:
Imakefile - the top level Makefile template
libraries.def - files for libraries that don't provide Imakefiles
*.xml - Wayland protocol definition source
*.c, *.h - C source code
*.awk - scripts used to generate headers
*.txt - text data used to generate some headers, i.e.
those containing MIME types or shaders
Building the source code is simple, provided that you have the
necessary libwayland-server library, wayland-scanner, pixman, XCB, and
X extension libraries installed:
xmkmf # to generate the Makefile
make # to build the binary
Running the binary should be simple as well:
./12to11
Wayland programs will then run as regular X windows.
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