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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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2
README.md
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@ -135,6 +135,8 @@ information on what to include when reporting a bug.
- Added macOS specific `GLFW_COCOA_FRAME_AUTOSAVE` window hint (#195)
- Added macOS specific `GLFW_COCOA_GRAPHICS_SWITCHING` window hint (#377,#935)
- Added `GLFW_INCLUDE_ES32` for including the OpenGL ES 3.2 header
- Added `GLFW_OSMESA_CONTEXT_API` for creating OpenGL contexts with
[OSMesa](https://www.mesa3d.org/osmesa.html) (#281)
- Removed `GLFW_USE_RETINA` compile-time option
- Bugfix: Calling `glfwMaximizeWindow` on a full screen window was not ignored
- Bugfix: `GLFW_INCLUDE_VULKAN` could not be combined with the corresponding

10
docs/news.dox
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@ -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
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@ -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

1
include/GLFW/glfw3.h
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@ -881,6 +881,7 @@ extern "C" {
#define GLFW_NATIVE_CONTEXT_API 0x00036001
#define GLFW_EGL_CONTEXT_API 0x00036002
#define GLFW_OSMESA_CONTEXT_API 0x00036003
/*! @defgroup shapes Standard cursor shapes
* @brief Standard system cursor shapes.

12
src/CMakeLists.txt
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@ -7,22 +7,22 @@ set(common_SOURCES context.c init.c input.c monitor.c vulkan.c window.c)
if (_GLFW_COCOA)
set(glfw_HEADERS ${common_HEADERS} cocoa_platform.h cocoa_joystick.h
posix_tls.h nsgl_context.h egl_context.h)
posix_tls.h nsgl_context.h egl_context.h osmesa_context.c)
set(glfw_SOURCES ${common_SOURCES} cocoa_init.m cocoa_joystick.m
cocoa_monitor.m cocoa_window.m cocoa_time.c posix_tls.c
nsgl_context.m egl_context.c)
nsgl_context.m egl_context.c osmesa_context.c)
elseif (_GLFW_WIN32)
set(glfw_HEADERS ${common_HEADERS} win32_platform.h win32_joystick.h
wgl_context.h egl_context.h)
wgl_context.h egl_context.h osmesa_context.h)
set(glfw_SOURCES ${common_SOURCES} win32_init.c win32_joystick.c
win32_monitor.c win32_time.c win32_tls.c win32_window.c
wgl_context.c egl_context.c)
wgl_context.c egl_context.c osmesa_context.c)
elseif (_GLFW_X11)
set(glfw_HEADERS ${common_HEADERS} x11_platform.h xkb_unicode.h posix_time.h
posix_tls.h glx_context.h egl_context.h)
posix_tls.h glx_context.h egl_context.h osmesa_context.h)
set(glfw_SOURCES ${common_SOURCES} x11_init.c x11_monitor.c x11_window.c
xkb_unicode.c posix_time.c posix_tls.c glx_context.c
egl_context.c)
egl_context.c osmesa_context.c)
if ("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
set(glfw_HEADERS ${glfw_HEADERS} linux_joystick.h)

1
src/cocoa_platform.h
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@ -55,6 +55,7 @@ typedef VkResult (APIENTRY *PFN_vkCreateMacOSSurfaceMVK)(VkInstance,const VkMacO
#include "cocoa_joystick.h"
#include "nsgl_context.h"
#include "egl_context.h"
#include "osmesa_context.h"
#define _glfw_dlopen(name) dlopen(name, RTLD_LAZY | RTLD_LOCAL)
#define _glfw_dlclose(handle) dlclose(handle)

9
src/cocoa_window.m
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@ -1065,13 +1065,20 @@ int _glfwPlatformCreateWindow(_GLFWwindow* window,
if (!_glfwCreateContextNSGL(window, ctxconfig, fbconfig))
return GLFW_FALSE;
}
else
else if (ctxconfig->source == GLFW_EGL_CONTEXT_API)
{
if (!_glfwInitEGL())
return GLFW_FALSE;
if (!_glfwCreateContextEGL(window, ctxconfig, fbconfig))
return GLFW_FALSE;
}
else if (ctxconfig->source == GLFW_OSMESA_CONTEXT_API)
{
if (!_glfwInitOSMesa())
return GLFW_FALSE;
if (!_glfwCreateContextOSMesa(window, ctxconfig, fbconfig))
return GLFW_FALSE;
}
}
if (window->monitor)

3
src/context.c
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@ -41,7 +41,8 @@
GLFWbool _glfwIsValidContextConfig(const _GLFWctxconfig* ctxconfig)
{
if (ctxconfig->source != GLFW_NATIVE_CONTEXT_API &&
ctxconfig->source != GLFW_EGL_CONTEXT_API)
ctxconfig->source != GLFW_EGL_CONTEXT_API &&
ctxconfig->source != GLFW_OSMESA_CONTEXT_API)
{
_glfwInputError(GLFW_INVALID_ENUM,
"Invalid context creation API %i",

4
src/internal.h
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@ -363,6 +363,8 @@ struct _GLFWcontext
_GLFW_PLATFORM_CONTEXT_STATE;
// This is defined in egl_context.h
_GLFW_EGL_CONTEXT_STATE;
// This is defined in osmesa_context.h
_GLFW_OSMESA_CONTEXT_STATE;
};
/*! @brief Window and context structure.
@ -531,6 +533,8 @@ struct _GLFWlibrary
_GLFW_PLATFORM_LIBRARY_TLS_STATE;
// This is defined in egl_context.h
_GLFW_EGL_LIBRARY_CONTEXT_STATE;
// This is defined in osmesa_context.h
_GLFW_OSMESA_LIBRARY_CONTEXT_STATE;
};

17
src/osmesa_context.c
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@ -36,25 +36,26 @@ static void makeContextCurrentOSMesa(_GLFWwindow* window)
{
if (window)
{
int width, height;
_glfwPlatformGetWindowSize(window, &width, &height);
// Check to see if we need to allocate a new buffer
if ((window->context.osmesa.buffer == NULL) ||
(window->osmesa.width != window->context.osmesa.width) ||
(window->osmesa.height != window->context.osmesa.height))
(width != window->context.osmesa.width) ||
(height != window->context.osmesa.height))
{
free(window->context.osmesa.buffer);
// Allocate the new buffer (width * height * 8-bit RGBA)
window->context.osmesa.buffer =
calloc(4, window->osmesa.width * window->osmesa.height);
window->context.osmesa.width = window->osmesa.width;
window->context.osmesa.height = window->osmesa.height;
window->context.osmesa.buffer = calloc(4, width * height);
window->context.osmesa.width = width;
window->context.osmesa.height = height;
}
if (!OSMesaMakeCurrent(window->context.osmesa.handle,
window->context.osmesa.buffer,
GL_UNSIGNED_BYTE,
window->osmesa.width, window->osmesa.height))
width, height))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"OSMesa: Failed to make context current");

4
src/osmesa_context.h
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@ -57,8 +57,8 @@ typedef GLFWglproc (GLAPIENTRY * PFN_OSMesaGetProcAddress)(const char*);
#define OSMesaGetDepthBuffer _glfw.osmesa.GetDepthBuffer
#define OSMesaGetProcAddress _glfw.osmesa.GetProcAddress
#define _GLFW_PLATFORM_CONTEXT_STATE _GLFWcontextOSMesa osmesa
#define _GLFW_PLATFORM_LIBRARY_CONTEXT_STATE _GLFWlibraryOSMesa osmesa
#define _GLFW_OSMESA_CONTEXT_STATE _GLFWcontextOSMesa osmesa
#define _GLFW_OSMESA_LIBRARY_CONTEXT_STATE _GLFWlibraryOSMesa osmesa
// OSMesa-specific per-context data

2
src/osmesa_platform.h
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@ -32,9 +32,11 @@
#define _GLFW_PLATFORM_WINDOW_STATE _GLFWwindowOSMesa osmesa
#define _GLFW_PLATFORM_CONTEXT_STATE
#define _GLFW_PLATFORM_MONITOR_STATE
#define _GLFW_PLATFORM_CURSOR_STATE
#define _GLFW_PLATFORM_LIBRARY_WINDOW_STATE
#define _GLFW_PLATFORM_LIBRARY_CONTEXT_STATE
#define _GLFW_EGL_CONTEXT_STATE
#define _GLFW_EGL_LIBRARY_CONTEXT_STATE

3
src/osmesa_window.c
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@ -52,7 +52,8 @@ int _glfwPlatformCreateWindow(_GLFWwindow* window,
if (ctxconfig->client != GLFW_NO_API)
{
if (ctxconfig->source == GLFW_NATIVE_CONTEXT_API)
if (ctxconfig->source == GLFW_NATIVE_CONTEXT_API ||
ctxconfig->source == GLFW_OSMESA_CONTEXT_API)
{
if (!_glfwInitOSMesa())
return GLFW_FALSE;

1
src/win32_platform.h
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@ -207,6 +207,7 @@ typedef VkBool32 (APIENTRY *PFN_vkGetPhysicalDeviceWin32PresentationSupportKHR)(
#include "win32_joystick.h"
#include "wgl_context.h"
#include "egl_context.h"
#include "osmesa_context.h"
#define _GLFW_WNDCLASSNAME L"GLFW30"

9
src/win32_window.c
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@ -1084,13 +1084,20 @@ int _glfwPlatformCreateWindow(_GLFWwindow* window,
if (!_glfwCreateContextWGL(window, ctxconfig, fbconfig))
return GLFW_FALSE;
}
else
else if (ctxconfig->source == GLFW_EGL_CONTEXT_API)
{
if (!_glfwInitEGL())
return GLFW_FALSE;
if (!_glfwCreateContextEGL(window, ctxconfig, fbconfig))
return GLFW_FALSE;
}
else if (ctxconfig->source == GLFW_OSMESA_CONTEXT_API)
{
if (!_glfwInitOSMesa())
return GLFW_FALSE;
if (!_glfwCreateContextOSMesa(window, ctxconfig, fbconfig))
return GLFW_FALSE;
}
}
if (window->monitor)

1
src/x11_platform.h
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@ -100,6 +100,7 @@ typedef VkBool32 (APIENTRY *PFN_vkGetPhysicalDeviceXcbPresentationSupportKHR)(Vk
#include "xkb_unicode.h"
#include "glx_context.h"
#include "egl_context.h"
#include "osmesa_context.h"
#if defined(__linux__)
#include "linux_joystick.h"
#else

28
src/x11_window.c
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@ -1586,12 +1586,7 @@ int _glfwPlatformCreateWindow(_GLFWwindow* window,
Visual* visual;
int depth;
if (ctxconfig->client == GLFW_NO_API)
{
visual = DefaultVisual(_glfw.x11.display, _glfw.x11.screen);
depth = DefaultDepth(_glfw.x11.display, _glfw.x11.screen);
}
else
if (ctxconfig->client != GLFW_NO_API)
{
if (ctxconfig->source == GLFW_NATIVE_CONTEXT_API)
{
@ -1600,13 +1595,25 @@ int _glfwPlatformCreateWindow(_GLFWwindow* window,
if (!_glfwChooseVisualGLX(ctxconfig, fbconfig, &visual, &depth))
return GLFW_FALSE;
}
else
else if (ctxconfig->source == GLFW_EGL_CONTEXT_API)
{
if (!_glfwInitEGL())
return GLFW_FALSE;
if (!_glfwChooseVisualEGL(ctxconfig, fbconfig, &visual, &depth))
return GLFW_FALSE;
}
else if (ctxconfig->source == GLFW_OSMESA_CONTEXT_API)
{
if (!_glfwInitOSMesa())
return GLFW_FALSE;
}
}
if (ctxconfig->client == GLFW_NO_API ||
ctxconfig->source == GLFW_OSMESA_CONTEXT_API)
{
visual = DefaultVisual(_glfw.x11.display, _glfw.x11.screen);
depth = DefaultDepth(_glfw.x11.display, _glfw.x11.screen);
}
if (!createNativeWindow(window, wndconfig, visual, depth))
@ -1619,11 +1626,16 @@ int _glfwPlatformCreateWindow(_GLFWwindow* window,
if (!_glfwCreateContextGLX(window, ctxconfig, fbconfig))
return GLFW_FALSE;
}
else
else if (ctxconfig->source == GLFW_EGL_CONTEXT_API)
{
if (!_glfwCreateContextEGL(window, ctxconfig, fbconfig))
return GLFW_FALSE;
}
else if (ctxconfig->source == GLFW_OSMESA_CONTEXT_API)
{
if (!_glfwCreateContextOSMesa(window, ctxconfig, fbconfig))
return GLFW_FALSE;
}
}
if (window->monitor)

6
tests/glfwinfo.c
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@ -43,6 +43,7 @@
#define API_NAME_NATIVE "native"
#define API_NAME_EGL "egl"
#define API_NAME_OSMESA "osmesa"
#define PROFILE_NAME_CORE "core"
#define PROFILE_NAME_COMPAT "compat"
@ -65,7 +66,8 @@ static void usage(void)
BEHAVIOR_NAME_FLUSH ")\n");
printf(" -c, --context-api=API the context creation API to use ("
API_NAME_NATIVE " or "
API_NAME_EGL ")\n");
API_NAME_EGL " or "
API_NAME_OSMESA ")\n");
printf(" -d, --debug request a debug context\n");
printf(" -f, --forward require a forward-compatible context\n");
printf(" -h, --help show this help\n");
@ -452,6 +454,8 @@ int main(int argc, char** argv)
glfwWindowHint(GLFW_CONTEXT_CREATION_API, GLFW_NATIVE_CONTEXT_API);
else if (strcasecmp(optarg, API_NAME_EGL) == 0)
glfwWindowHint(GLFW_CONTEXT_CREATION_API, GLFW_EGL_CONTEXT_API);
else if (strcasecmp(optarg, API_NAME_OSMESA) == 0)
glfwWindowHint(GLFW_CONTEXT_CREATION_API, GLFW_OSMESA_CONTEXT_API);
else
{
usage();