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Add GLFW_OSMESA_CONTEXT_API

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This allows the creation of OpenGL contexts via OSMesa on existing
platforms.  It does not add a compile- or link-time dependency on
OSMesa.

Fixes #281.
This commit is contained in:
Camilla Löwy
2017-02-28 19:23:25 +01:00
parent a44f2c0e65
commit e9560ef021
18 changed files with 96 additions and 39 deletions
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10
docs/news.dox
View File

@@ -46,8 +46,14 @@ provided by [MoltenVK](https://moltengl.com/moltenvk/).
@subsection news_33_osmesa OSMesa backend for headless software rendering
GLFW now supports headless context creation and software rendering via OSMesa,
intended for automated testing. This backend does not provide input.
GLFW now supports creating offscreen OpenGL contexts using
[OSMesa](https://www.mesa3d.org/osmesa.html) by setting
[GLFW_CONTEXT_CREATION_API](@ref GLFW_CONTEXT_CREATION_API_hint) to
`GLFW_OSMESA_CONTEXT_API`.
There is also a new headless backend that uses OSMesa as its native context
creation API, intended for automated testing. This backend does not provide
input.
@section news_32 New features in 3.2

18
docs/window.dox
View File

@@ -299,9 +299,9 @@ This is a hard constraint.
@anchor GLFW_CONTEXT_CREATION_API_hint
__GLFW_CONTEXT_CREATION_API__ specifies which context creation API to use to
create the context. Possible values are `GLFW_NATIVE_CONTEXT_API` and
`GLFW_EGL_CONTEXT_API`. This is a hard constraint. If no client API is
requested, this hint is ignored.
create the context. Possible values are `GLFW_NATIVE_CONTEXT_API`,
`GLFW_EGL_CONTEXT_API` and `GLFW_OSMESA_CONTEXT_API`. This is a hard
constraint. If no client API is requested, this hint is ignored.
@par
@macos The EGL API is not available on this platform and requests to use it
@@ -311,6 +311,12 @@ will fail.
__Wayland, Mir:__ The EGL API _is_ the native context creation API, so this hint
will have no effect.
@par
__OSMesa:__ As its name implies, an OpenGL context created with OSMesa does not
update the window contents when its buffers are swapped. Use OpenGL functions
or the OSMesa native access functions @ref glfwGetOSMesaColorBuffer and @ref
glfwGetOSMesaDepthBuffer to retrieve the framebuffer contents.
@note An OpenGL extension loader library that assumes it knows which context
creation API is used on a given platform may fail if you change this hint. This
can be resolved by having it load via @ref glfwGetProcAddress, which always uses
@@ -480,7 +486,7 @@ GLFW_STEREO | `GLFW_FALSE` | `GLFW_TRUE` or `GL
GLFW_SRGB_CAPABLE | `GLFW_FALSE` | `GLFW_TRUE` or `GLFW_FALSE`
GLFW_DOUBLEBUFFER | `GLFW_TRUE` | `GLFW_TRUE` or `GLFW_FALSE`
GLFW_CLIENT_API | `GLFW_OPENGL_API` | `GLFW_OPENGL_API`, `GLFW_OPENGL_ES_API` or `GLFW_NO_API`
GLFW_CONTEXT_CREATION_API | `GLFW_NATIVE_CONTEXT_API` | `GLFW_NATIVE_CONTEXT_API` or `GLFW_EGL_CONTEXT_API`
GLFW_CONTEXT_CREATION_API | `GLFW_NATIVE_CONTEXT_API` | `GLFW_NATIVE_CONTEXT_API`, `GLFW_EGL_CONTEXT_API` or `GLFW_OSMESA_CONTEXT_API`
GLFW_CONTEXT_VERSION_MAJOR | 1 | Any valid major version number of the chosen client API
GLFW_CONTEXT_VERSION_MINOR | 0 | Any valid minor version number of the chosen client API
GLFW_CONTEXT_ROBUSTNESS | `GLFW_NO_ROBUSTNESS` | `GLFW_NO_ROBUSTNESS`, `GLFW_NO_RESET_NOTIFICATION` or `GLFW_LOSE_CONTEXT_ON_RESET`
@@ -1110,8 +1116,8 @@ either `GLFW_OPENGL_API`, `GLFW_OPENGL_ES_API` or `GLFW_NO_API`.
@anchor GLFW_CONTEXT_CREATION_API_attrib
__GLFW_CONTEXT_CREATION_API__ indicates the context creation API used to create
the window's context; either `GLFW_NATIVE_CONTEXT_API` or
`GLFW_EGL_CONTEXT_API`.
the window's context; either `GLFW_NATIVE_CONTEXT_API`, `GLFW_EGL_CONTEXT_API`
or `GLFW_OSMESA_CONTEXT_API`.
@anchor GLFW_CONTEXT_VERSION_MAJOR_attrib
@anchor GLFW_CONTEXT_VERSION_MINOR_attrib