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4 Commits

Author SHA1 Message Date
Nigel Tao
4f42fa989e go.mobile/gl: use column major ordering.
Also rename some files:
types.go      -> types_prod.go
typesdebug.go -> types_debug.go
(new file)       types_common.go

In discussing https://golang.org/cl/144480043/ crawshaw said:

The third argument to glUniformMatrix* is "transpose." According to the
linked documentation, which is usually better:

"If transpose is GL_FALSE, each matrix is assumed to be supplied in
column major order. If transpose is GL_TRUE, each matrix is assumed to
be supplied in row major order."

However, the documentation for OpenGL ES 2 doesn't bother even telling
you, it just says that this parameter must always be set to GL_FALSE. So
it's not supported on most Android devices. (Sadly the older
documentation appears to have been discontinued.)

So yes, GL seems to default to column-major, and the older GLES2 I'm
targeting left the transpose argument in but doesn't support it. Hence
I'm not exposing it through this API.

LGTM=crawshaw
R=crawshaw
CC=golang-codereviews
https://golang.org/cl/148690043
2014-10-09 14:00:00 +11:00
David Crawshaw
b1ea4eba37 go.mobile/gl: f32 utilities and extra debugging
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
2014-09-17 18:07:50 -04:00
David Crawshaw
3bd69d3fcc go.mobile/gl: tracing debug mode
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
2014-08-26 10:03:00 -04:00
David Crawshaw
0394fdc6fe go.mobile/gl: OpenGL ES 2 bindings
A new set of bindings, as none of the existing open source
ones meet all the desired criteria:

- just ES 2/3, no deprecated/wider interfaces
- no hiding of GL functions behind higher-level interfaces
- no exported use of C types
- no other library dependencies
- no exported use of unsafe.Pointer
- use Go slices for passing arrays

Function stubs were generated from the gl.xml spec file,
however there were enough special cases (and few enough
functions in the ES spec) that it was easier to construct
most of this file by hand rather than complete a generator
script. So it is not included in this CL.

LGTM=adg
R=golang-codereviews, bryanturley, adg, capnm9
CC=golang-codereviews
https://golang.org/cl/127870043
2014-08-25 08:17:08 -04:00