commit b65f32ebe2c86869b07ac1c986660dfb2187b7d3
author Jesse Hall <jessehall@google.com> Fri Sep 27 22:10:47 2013 -0700
committer Jesse Hall <jessehall@google.com> Mon Sep 30 10:49:16 2013 -0700
tree df8a549a979c6c612b1af3170a99173dd251784b
parent 86206b41b2ff000e086301c6bafb8da577e563b2

Fix two EGLConfig selection bugs

This fixes two bugs introduced by
  Change-Id: Ia8cc084c02a0e3de910def024da8a08d02bbd89d

(a) There is no invalid EGLConfig value, in particular zero is valid.
    Checking return values of eglGetConfigs and eglChooseConfig is the
    only way to determine success.
(b) The "simple" EGLConfig query used as the emulator fallback should
    not include EGL_RECORDABLE; the emulator doesn't have it.

Bug: 10935622
Change-Id: Ib798a24e7cf06a679811c46eaa45d39174a715ec

services/surfaceflinger/SurfaceFlinger.cpp

diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index f83cc06..4f139fe 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -366,12 +366,10 @@
     operator EGLint const* () const { return &mList.keyAt(0).v; }
 };
 
-EGLConfig SurfaceFlinger::selectEGLConfig(EGLDisplay display, EGLint nativeVisualId,
-    EGLint renderableType) {
+status_t SurfaceFlinger::selectEGLConfig(EGLDisplay display, EGLint nativeVisualId,
+    EGLint renderableType, EGLConfig* config) {
     // select our EGLConfig. It must support EGL_RECORDABLE_ANDROID if
     // it is to be used with WIFI displays
-    EGLConfig config;
-    EGLint dummy;
     status_t err;
     EGLint wantedAttribute;
     EGLint wantedAttributeValue;
@@ -390,22 +388,18 @@
 
     } else {
         // if no renderable type specified, fallback to a simplified query
-        attribs[EGL_RECORDABLE_ANDROID]         = EGL_TRUE;
         wantedAttribute                         = EGL_NATIVE_VISUAL_ID;
         wantedAttributeValue                    = nativeVisualId;
     }
 
     err = selectConfigForAttribute(display, attribs, wantedAttribute,
-        wantedAttributeValue, &config);
-    if (!err)
-        goto success;
-
-    return 0;
-
-success:
-    if (eglGetConfigAttrib(display, config, EGL_CONFIG_CAVEAT, &dummy))
-        ALOGW_IF(dummy == EGL_SLOW_CONFIG, "EGL_SLOW_CONFIG selected!");
-    return config;
+        wantedAttributeValue, config);
+    if (err == NO_ERROR) {
+        EGLint caveat;
+        if (eglGetConfigAttrib(display, *config, EGL_CONFIG_CAVEAT, &caveat))
+            ALOGW_IF(caveat == EGL_SLOW_CONFIG, "EGL_SLOW_CONFIG selected!");
+    }
+    return err;
 }
 
 void SurfaceFlinger::init() {
@@ -413,6 +407,7 @@
     ALOGI(  "SurfaceFlinger's main thread ready to run. "
             "Initializing graphics H/W...");
 
+    status_t err;
     Mutex::Autolock _l(mStateLock);
 
     // initialize EGL for the default display
@@ -425,21 +420,23 @@
             *static_cast<HWComposer::EventHandler *>(this));
 
     // First try to get an ES2 config
-    mEGLConfig = selectEGLConfig(mEGLDisplay, mHwc->getVisualID(), EGL_OPENGL_ES2_BIT);
+    err = selectEGLConfig(mEGLDisplay, mHwc->getVisualID(), EGL_OPENGL_ES2_BIT,
+            &mEGLConfig);
 
-    if (!mEGLConfig) {
+    if (err != NO_ERROR) {
         // If ES2 fails, try ES1
-        mEGLConfig = selectEGLConfig(mEGLDisplay, mHwc->getVisualID(), EGL_OPENGL_ES_BIT);
+        err = selectEGLConfig(mEGLDisplay, mHwc->getVisualID(),
+                EGL_OPENGL_ES_BIT, &mEGLConfig);
     }
 
-    if (!mEGLConfig) {
+    if (err != NO_ERROR) {
         // still didn't work, probably because we're on the emulator...
         // try a simplified query
         ALOGW("no suitable EGLConfig found, trying a simpler query");
-        mEGLConfig = selectEGLConfig(mEGLDisplay, mHwc->getVisualID(), 0);
+        err = selectEGLConfig(mEGLDisplay, mHwc->getVisualID(), 0, &mEGLConfig);
     }
 
-    if (!mEGLConfig) {
+    if (err != NO_ERROR) {
         // this EGL is too lame for android
         LOG_ALWAYS_FATAL("no suitable EGLConfig found, giving up");
     }