egl: Implement EGL_KHR_context_flush_control

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>

src/egl/drivers/dri2/egl_dri2.c

@@ -92,7 +92,7 @@
 #define DRM_FORMAT_MOD_INVALID ((1ULL<<56) - 1)
 #endif
 
-#define NUM_ATTRIBS 10
+#define NUM_ATTRIBS 12
 
 static void
 dri_set_background_context(void *loaderPrivate)
@@ -457,6 +457,7 @@ static const struct dri2_extension_match optional_core_extensions[] = {
    { __DRI2_RENDERER_QUERY, 1, offsetof(struct dri2_egl_display, rendererQuery) },
    { __DRI2_INTEROP, 1, offsetof(struct dri2_egl_display, interop) },
    { __DRI_IMAGE, 1, offsetof(struct dri2_egl_display, image) },
+   { __DRI2_FLUSH_CONTROL, 1, offsetof(struct dri2_egl_display, flush_control) },
    { NULL, 0, 0 }
 };
 
@@ -766,6 +767,9 @@ dri2_setup_screen(_EGLDisplay *disp)
       }
 #endif
    }
+
+   if (dri2_dpy->flush_control)
+      disp->Extensions.KHR_context_flush_control = EGL_TRUE;
 }
 
 void
@@ -1227,6 +1231,11 @@ dri2_fill_context_attribs(struct dri2_egl_context *dri2_ctx,
       ctx_attribs[pos++] = val;
    }
 
+   if (dri2_ctx->base.ReleaseBehavior == EGL_CONTEXT_RELEASE_BEHAVIOR_NONE_KHR) {
+      ctx_attribs[pos++] = __DRI_CTX_ATTRIB_RELEASE_BEHAVIOR;
+      ctx_attribs[pos++] = __DRI_CTX_RELEASE_BEHAVIOR_NONE;
+   }
+
    *num_attribs = pos;
 
    return true;

src/egl/drivers/dri2/egl_dri2.h

@@ -164,6 +164,7 @@ struct dri2_egl_display
    const __DRIdri2Extension       *dri2;
    const __DRIswrastExtension     *swrast;
    const __DRI2flushExtension     *flush;
+   const __DRI2flushControlExtension *flush_control;
    const __DRItexBufferExtension  *tex_buffer;
    const __DRIimageExtension      *image;
    const __DRIrobustnessExtension *robustness;

src/egl/main/eglapi.c

@@ -494,6 +494,7 @@ _eglCreateExtensionsString(_EGLDisplay *dpy)
 
    _EGL_CHECK_EXTENSION(KHR_cl_event2);
    _EGL_CHECK_EXTENSION(KHR_config_attribs);
+   _EGL_CHECK_EXTENSION(KHR_context_flush_control);
    _EGL_CHECK_EXTENSION(KHR_create_context);
    _EGL_CHECK_EXTENSION(KHR_create_context_no_error);
    _EGL_CHECK_EXTENSION(KHR_fence_sync);

src/egl/main/eglcontext.c

@@ -386,6 +386,15 @@ _eglParseContextAttribList(_EGLContext *ctx, _EGLDisplay *dpy,
             break;
          }
 
+      case EGL_CONTEXT_RELEASE_BEHAVIOR_KHR:
+         if (val == EGL_CONTEXT_RELEASE_BEHAVIOR_NONE_KHR ||
+             val == EGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_KHR) {
+            ctx->ReleaseBehavior = val;
+         } else {
+            err = EGL_BAD_ATTRIBUTE;
+         }
+         break;
+
       default:
          err = EGL_BAD_ATTRIBUTE;
          break;
@@ -588,6 +597,7 @@ _eglInitContext(_EGLContext *ctx, _EGLDisplay *dpy, _EGLConfig *conf,
    ctx->Profile = EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR;
    ctx->ResetNotificationStrategy = EGL_NO_RESET_NOTIFICATION_KHR;
    ctx->ContextPriority = EGL_CONTEXT_PRIORITY_MEDIUM_IMG;
+   ctx->ReleaseBehavior = EGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_KHR;
 
    err = _eglParseContextAttribList(ctx, dpy, attrib_list);
    if (err == EGL_SUCCESS && ctx->Config) {

src/egl/main/eglcontext.h

@@ -64,6 +64,7 @@ struct _egl_context
    EGLint ResetNotificationStrategy;
    EGLint ContextPriority;
    EGLBoolean NoError;
+   EGLint ReleaseBehavior;
 
    /* The real render buffer when a window surface is bound */
    EGLint WindowRenderBuffer;

src/egl/main/egldisplay.h

@@ -112,6 +112,7 @@ struct _egl_extensions
 
    EGLBoolean KHR_cl_event2;
    EGLBoolean KHR_config_attribs;
+   EGLBoolean KHR_context_flush_control;
    EGLBoolean KHR_create_context;
    EGLBoolean KHR_fence_sync;
    EGLBoolean KHR_get_all_proc_addresses;