path: root/include
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authorNeil Roberts <>2014-03-07 18:05:47 +0000
committerKristian Høgsberg <>2014-03-12 14:40:47 -0700
commit551d459af421a2eb937e9e16301bb64da4624f89 (patch)
treeba2399deac65bbb2ce5d913d3936db145ff632a6 /include
parent4b17dff3e5128bef67ea79d20624e878c3b48729 (diff)
Add the EGL_MESA_configless_context extension
This extension provides a way for an application to render to multiple surfaces with different buffer formats without having to use multiple contexts. An EGLContext can be created without an EGLConfig by passing EGL_NO_CONFIG_MESA. In that case there are no restrictions on the surfaces that can be used with the context apart from that they must be using the same EGLDisplay. _mesa_initialze_context can now take a NULL gl_config which will mark the context as ‘configless’. It will memset the visual to zero in that case. Previously the i965 and i915 drivers were explicitly creating a zeroed visual whenever 0 is passed for the EGLConfig. Mesa needs to be aware that the context is configless because it affects the initial value to use for glDrawBuffer. The first time the context is bound it will set the initial value for configless contexts depending on whether the framebuffer used is double-buffered. Reviewed-by: Kristian Høgsberg <>
Diffstat (limited to 'include')
1 files changed, 5 insertions, 0 deletions
diff --git a/include/EGL/eglmesaext.h b/include/EGL/eglmesaext.h
index b3229e39748..5fcc527d65e 100644
--- a/include/EGL/eglmesaext.h
+++ b/include/EGL/eglmesaext.h
@@ -165,6 +165,11 @@ typedef EGLBoolean (EGLAPIENTRYP PFNEGLSWAPBUFFERSREGIONNOK) (EGLDisplay dpy, EG
#define EGL_NATIVE_BUFFER_ANDROID 0x3140 /* eglCreateImageKHR target */
+#ifndef EGL_MESA_configless_context
+#define EGL_MESA_configless_context 1
+#define EGL_NO_CONFIG_MESA ((EGLConfig)0)
#ifdef __cplusplus