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Null: Add limited EGL context creation on Mesa

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This provides very limited support for context creation via EGL on the
Null platform.  It supports Unix-like systems with a version of Mesa
that provides EGL_MESA_platform_surfaceless.

Even then, the actual framebuffer provided is not resized along with the
'window'.  That will hopefully change once context and framebuffer
creation are separated, but this commit should at least allow more
applications than before to run on the Null platform.
This commit is contained in:
Camilla Löwy
2024-03-11 14:29:07 +01:00
parent 860c8ef38f
commit 738dd6ff1d
4 changed files with 47 additions and 10 deletions
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src/egl_context.c
+33 -8
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@@ -92,7 +92,7 @@ static GLFWbool chooseEGLConfig(const _GLFWctxconfig* ctxconfig,
EGLConfig* nativeConfigs;
_GLFWfbconfig* usableConfigs;
const _GLFWfbconfig* closest;
int i, nativeCount, usableCount, apiBit;
int i, nativeCount, usableCount, apiBit, surfaceTypeBit;
GLFWbool wrongApiAvailable = GLFW_FALSE;
if (ctxconfig->client == GLFW_OPENGL_ES_API)
@@ -105,6 +105,11 @@ static GLFWbool chooseEGLConfig(const _GLFWctxconfig* ctxconfig,
else
apiBit = EGL_OPENGL_BIT;
if (_glfw.egl.platform == EGL_PLATFORM_SURFACELESS_MESA)
surfaceTypeBit = EGL_PBUFFER_BIT;
else
surfaceTypeBit = EGL_WINDOW_BIT;
if (fbconfig->stereo)
{
_glfwInputError(GLFW_FORMAT_UNAVAILABLE, "EGL: Stereo rendering not supported");
@@ -133,8 +138,7 @@ static GLFWbool chooseEGLConfig(const _GLFWctxconfig* ctxconfig,
if (getEGLConfigAttrib(n, EGL_COLOR_BUFFER_TYPE) != EGL_RGB_BUFFER)
continue;
// Only consider window EGLConfigs
if (!(getEGLConfigAttrib(n, EGL_SURFACE_TYPE) & EGL_WINDOW_BIT))
if (!(getEGLConfigAttrib(n, EGL_SURFACE_TYPE) & surfaceTypeBit))
continue;
#if defined(_GLFW_X11)
@@ -420,6 +424,8 @@ GLFWbool _glfwInitEGL(void)
_glfwPlatformGetModuleSymbol(_glfw.egl.handle, "eglDestroyContext");
_glfw.egl.CreateWindowSurface = (PFN_eglCreateWindowSurface)
_glfwPlatformGetModuleSymbol(_glfw.egl.handle, "eglCreateWindowSurface");
_glfw.egl.CreatePbufferSurface = (PFN_eglCreatePbufferSurface)
_glfwPlatformGetModuleSymbol(_glfw.egl.handle, "eglCreatePbufferSurface");
_glfw.egl.MakeCurrent = (PFN_eglMakeCurrent)
_glfwPlatformGetModuleSymbol(_glfw.egl.handle, "eglMakeCurrent");
_glfw.egl.SwapBuffers = (PFN_eglSwapBuffers)
@@ -442,6 +448,7 @@ GLFWbool _glfwInitEGL(void)
!_glfw.egl.DestroySurface ||
!_glfw.egl.DestroyContext ||
!_glfw.egl.CreateWindowSurface ||
!_glfw.egl.CreatePbufferSurface ||
!_glfw.egl.MakeCurrent ||
!_glfw.egl.SwapBuffers ||
!_glfw.egl.SwapInterval ||
@@ -477,6 +484,8 @@ GLFWbool _glfwInitEGL(void)
_glfwStringInExtensionString("EGL_ANGLE_platform_angle_vulkan", extensions);
_glfw.egl.ANGLE_platform_angle_metal =
_glfwStringInExtensionString("EGL_ANGLE_platform_angle_metal", extensions);
_glfw.egl.MESA_platform_surfaceless =
_glfwStringInExtensionString("EGL_MESA_platform_surfaceless", extensions);
}
if (_glfw.egl.EXT_platform_base)
@@ -708,20 +717,36 @@ GLFWbool _glfwCreateContextEGL(_GLFWwindow* window,
SET_ATTRIB(EGL_PRESENT_OPAQUE_EXT, !fbconfig->transparent);
}
if (_glfw.egl.platform == EGL_PLATFORM_SURFACELESS_MESA)
{
int width, height;
_glfw.platform.getFramebufferSize(window, &width, &height);
SET_ATTRIB(EGL_WIDTH, width);
SET_ATTRIB(EGL_HEIGHT, height);
}
SET_ATTRIB(EGL_NONE, EGL_NONE);
native = _glfw.platform.getEGLNativeWindow(window);
// HACK: ANGLE does not implement eglCreatePlatformWindowSurfaceEXT
// despite reporting EGL_EXT_platform_base
if (_glfw.egl.platform && _glfw.egl.platform != EGL_PLATFORM_ANGLE_ANGLE)
if (!_glfw.egl.platform || _glfw.egl.platform == EGL_PLATFORM_ANGLE_ANGLE)
{
// HACK: Also use non-platform function for ANGLE, as it does not
// implement eglCreatePlatformWindowSurfaceEXT despite reporting
// support for EGL_EXT_platform_base
window->context.egl.surface =
eglCreatePlatformWindowSurfaceEXT(_glfw.egl.display, config, native, attribs);
eglCreateWindowSurface(_glfw.egl.display, config, native, attribs);
}
else if (_glfw.egl.platform == EGL_PLATFORM_SURFACELESS_MESA)
{
// HACK: Use a pbuffer surface as the default framebuffer
window->context.egl.surface =
eglCreatePbufferSurface(_glfw.egl.display, config, attribs);
}
else
{
window->context.egl.surface =
eglCreateWindowSurface(_glfw.egl.display, config, native, attribs);
eglCreatePlatformWindowSurfaceEXT(_glfw.egl.display, config, native, attribs);
}
if (window->context.egl.surface == EGL_NO_SURFACE)