Nothing exciting, just exercising the layout of the functions.
Change-Id: I460fdc1c9596968bbdfdafe7d068ea393e0029ed
Reviewed-on: https://go-review.googlesource.com/24051
Reviewed-by: Nigel Tao <nigeltao@golang.org>
This CL covers the basic structure for supporting ES 3.0 where the
platform provides it, and includes one ES 3.0 function as a
proof-of-concept. The rest of the functions and constant values will
follow in later CLs.
ES 3.0 is available everywhere except Android older than
version 4.3, approximately half of Android devices today:
https://developer.android.com/about/dashboards/index.html#OpenGL
Change-Id: Ief7714131227c447a0c603dadad0bd5285999bb3
Reviewed-on: https://go-review.googlesource.com/23821
Reviewed-by: Nigel Tao <nigeltao@golang.org>
Before this CL, BufferInit always causes INVALID_ENUM error because
0 (a2) is always passed to 'usage' argument of glBufferData.
This CL fixes removes a2, shifts a3 to a2, and adds parg as null
pointer explicitly.
Fixesgolang/go#14403
Change-Id: I11109c983316f5975a79f42dc51d7a180e222b91
Reviewed-on: https://go-review.googlesource.com/19703
Reviewed-by: David Crawshaw <crawshaw@golang.org>
This allows a subsequent CL to introduce windows support by directly
calling an ANGLE dll.
For golang/go#9306
Change-Id: I7dbe8f2b77b9e2c744f0d848f716ee4448916fe7
Reviewed-on: https://go-review.googlesource.com/17674
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
It is an error to use a gl.Context concurrently. (Each Context
contains a state machine, so there is no way this can work.)
Up until now only the GL driver could report such a misuse, and
it generally does a poor job of it. Our command buffer adds some
small oppertunity for the race detector to help, but it makes it
harder to debug other kinds of driver crashes, so it is worth
disabling in debug mode.
To make it easy, compiling with -tags gldebug now inserts an
explicit check that there are no other active GL calls outstanding.
Adding something like:
go func() {
for {
glctx.GetInteger(gl.ALPHA_BITS)
}
}()
to x/mobile/example/basic now reliably crashes when compiled
with -tags gldebug, providing a stack trace that includes both
misbehaving goroutines.
Change-Id: I3d85d94220bca2a15eaf2742f13b44db1f3428bf
Reviewed-on: https://go-review.googlesource.com/15180
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
This means that if the OpenGL driver crashes, the stack trace will
contain a goroutine blocked in the function that caused the panic.
Fixesgolang/go#12786
Change-Id: I039c74f9e24de777b925475a50e8c96129692f70
Reviewed-on: https://go-review.googlesource.com/15160
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
All OpenGL functions are now methods on a Context interface. The
gl.Context matches the one loaded into thread-local storage in C.
For mobile apps, the context is owned by an app.App. For now, it is
provided through the events channel on a lifecycle event. Long-term,
it should probably be available by a method on app.App, but this is
inherently racey with our current use of a channel to deliver events.
Shiny-based programs will have a gl.Context associated with a each
shiny.Window. The expectation is each Window will have different
contexts, allowing them to draw separately.
Change-Id: Ie09986fb74e493129f2ea542a151c95c6fa29812
Reviewed-on: https://go-review.googlesource.com/13431
Reviewed-by: Nigel Tao <nigeltao@golang.org>
This change will break Darwin. I have only built and tested this on
desktop linux and Android linux. A follow-up CL will fix Darwin.
Currently, OpenGL gets its own thread, and UI C code (e.g. the Android
event loop, or the X11 event loop) gets its own thread. This relies on
multiple system-provided UI-related C libraries working nicely together,
even when running on different threads. Keeping all the C code on the
one thread seems more sound.
As side-effects:
- In package app/debug, DrawFPS now takes an explicit Config.
- In package app, some callbacks now take an explicit Config.
- In package exp/sprite, Render now takes an explicit Config.
- In package event, there are new events (Config, Draw, Lifecycle),
and an event filter mechanism to replace multiple app Callbacks.
- In package geom, the deprecated Width, Height and PixelsPerPt global
variables were removed in favor of an event.Config that is
explicitly passed around (and does not require mutex-locking).
Converting a geom.Pt to pixels now requires passing a pixelsPerPt.
- In package gl, the Do, Start and Stop functions are removed, as well
as the need to call Start in its own goroutine. There is no longer a
separate GL thread. Instead, package app explicitly performs any GL
work (gl.DoWork) when some is available (gl.WorkAvailable).
- In package gl/glutil, Image.Draw now takes an explicit Config.
Callbacks are no longer executed on 'the UI thread'.
Changing the app programming model from callbacks to events (since a
channel of events works with select) will be a follow-up change.
Change-Id: Id9865cd9ee1c45a98c613e9021a63c17226a64b1
Reviewed-on: https://go-review.googlesource.com/11351
Reviewed-by: David Crawshaw <crawshaw@golang.org>
All GL function calls fill out a C.struct_fnargs and drop it on the
work queue. The Start function drains the work queue and hands
over a batch of calls to C.process which runs them. This allows
multiple GL calls to be executed in a single cgo call.
A GL call is marked as blocking if it returns a value, or if it
takes a Go pointer. In this case the call will not return until
C.process sends a value on the retvalue channel.
Change-Id: I4c76b2a8ad55f57b0c98d200d0fb708d4634e042
Reviewed-on: https://go-review.googlesource.com/10452
Reviewed-by: Nigel Tao <nigeltao@golang.org>
Conflicts with cl/10396. I'll submit this first and update the it.
Change-Id: Ibc873b3fe896ecd2415a42676614807788a8d1c6
Reviewed-on: https://go-review.googlesource.com/10399
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reorder DrawElements arguments to match OpenGL spec order:
DrawElements(mode, ty, offset, count) -> (mode, count, ty, offset)
GetActiveAttrib, GetActiveUniform are defined by spec to accept
corresponding integer _index_, not location type. Change their
signature to do that:
GetActiveAttrib(p Program, a Attrib) -> (p Program, index uint32)
GetActiveUniform(p Program, u Uniform) -> (p Program, index uint32)
Clarify and make documentation, parameter names more clear for Uniform
(uniform location), Attrib (attribute location) types,
EnableVertexAttribArray, DisableVertexAttribArray, GetAttribLocation,
GetUniformLocation funcs.
Resolvesgolang/go#10218 again.
Change-Id: I5b822235d9485701186a43dae0b9fd898cc6a3d8
Reviewed-on: https://go-review.googlesource.com/8166
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Change func names and parameter order to more closely follow OpenGL
ES/WebGL spec.
BufferData(target, usage, src) -> BufferData(target, src, usage)
GenBuffer -> CreateBuffer
GenFramebuffer -> CreateFramebuffer
GenRenderbuffer -> CreateRenderbuffer
GenTexture -> CreateTexture
Fix issue where glBoolean helper was returning inverted result.
Make Attrib.String() logic consistent with others (print value, not
struct).
Make internal code of GetUniformLocation the same as GetAttribLocation
and BindAttribLocation for consistency.
Resolvesgolang/go#10218.
Change-Id: Ib33dfff7c22c4d178b2e6b8d228f80f3c17308a8
Reviewed-on: https://go-review.googlesource.com/8000
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Change-Id: I9962d49a4e620fb734bc218ebfa558336ade8e06
Reviewed-on: https://go-review.googlesource.com/5200
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
They don't make sense for other platforms yet.
See golang/go#9603
Change-Id: I2ed269a00b1e1961aadf0a47fc95bbe3cd230113
Reviewed-on: https://go-review.googlesource.com/2902
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Change-Id: I90a813c0823498297ff0bb7718bee6cd61b87581
Reviewed-on: https://go-review.googlesource.com/1517
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Change-Id: Icad6cb694b31924164483609e0fd9c7cce8e3f0d
Reviewed-on: https://go-review.googlesource.com/1185
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Split constants out into their own file. Hide the
values in named types in a struct, so that when
using the gldebug tag we can attach extra
information (such as the name of a uniform and
attribute).
LGTM=nigeltao
R=golang-codereviews, bryanturley, nigeltao
CC=davidday, golang-codereviews
https://golang.org/cl/137630043
Compiling a binary with "-tags gldebug" will add log
tracing to each GL function call. This is the best I
can offer in lieu of of real error handling.
A colleague has accused me of Aspect-oriented
programming. The wikipedia article on the topic lost
me in the first paragraph, so just for the record,
this was inspired by the way the cover tool rewrites
source code.
LGTM=sameer
R=golang-codereviews, sameer
CC=golang-codereviews
https://golang.org/cl/128640043
