command_buffer_gles2: Implement EGL default Display as a global object

gpu/gles2_conform_support/egl/config.cc

Index: gpu/gles2_conform_support/egl/config.cc
diff --git a/gpu/gles2_conform_support/egl/config.cc b/gpu/gles2_conform_support/egl/config.cc
index d6ce3072c982e5f01c9194d6f1dcc9f21622e042..53bd440d7cb31bca7b3e61c78037dd7659b53e2d 100644
--- a/gpu/gles2_conform_support/egl/config.cc
+++ b/gpu/gles2_conform_support/egl/config.cc
@@ -3,10 +3,11 @@
 // found in the LICENSE file.
 
 #include "gpu/gles2_conform_support/egl/config.h"
+#include "base/logging.h"
 
 namespace egl {
 
-Config::Config()
+Config::Config(EGLint surface_type)
     : buffer_size_(0),
       red_size_(0),
       green_size_(0),
@@ -34,16 +35,37 @@ Config::Config()
       sample_buffers_(0),
       samples_(0),
       stencil_size_(0),
-      surface_type_(EGL_WINDOW_BIT),
+      surface_type_(surface_type),
       transparent_type_(EGL_NONE),
       transparent_red_value_(EGL_DONT_CARE),
       transparent_green_value_(EGL_DONT_CARE),
       transparent_blue_value_(EGL_DONT_CARE) {
+  DCHECK(surface_type == EGL_WINDOW_BIT || surface_type == EGL_PBUFFER_BIT);
 }
 
 Config::~Config() {
 }
 
+bool Config::Matches(const EGLint* attrib_list) const {
+  DCHECK(ValidateAttributeList(attrib_list));
+  if (attrib_list) {
+    for (int i = 0; attrib_list[i] != EGL_NONE; i += 2) {
+      switch (attrib_list[i]) {
+        case EGL_SURFACE_TYPE: {
+          EGLint requested_surface_type = attrib_list[i + 1];
+          if (requested_surface_type != EGL_DONT_CARE &&
+              (requested_surface_type & surface_type_) !=
+                  requested_surface_type)
+            return false;
+        }
+        default:
+          break;
+      }
+    }
+  }
+  return true;
+}
+
 bool Config::GetAttrib(EGLint attribute, EGLint* value) const {
   // TODO(alokp): Find out how to get correct values.
   switch (attribute) {
@@ -149,4 +171,52 @@ bool Config::GetAttrib(EGLint attribute, EGLint* value) const {
   return true;
 }
 
+bool Config::ValidateAttributeList(const EGLint* attrib_list) {
+  if (attrib_list) {
+    for (int i = 0; attrib_list[i] != EGL_NONE; i += 2) {
+      switch (attrib_list[i]) {
+        case EGL_ALPHA_MASK_SIZE:
+        case EGL_ALPHA_SIZE:
+        case EGL_BIND_TO_TEXTURE_RGB:
+        case EGL_BIND_TO_TEXTURE_RGBA:
+        case EGL_BLUE_SIZE:
+        case EGL_BUFFER_SIZE:
+        case EGL_COLOR_BUFFER_TYPE:
+        case EGL_CONFIG_CAVEAT:
+        case EGL_CONFIG_ID:
+        case EGL_CONFORMANT:
+        case EGL_DEPTH_SIZE:
+        case EGL_GREEN_SIZE:
+        case EGL_LEVEL:
+        case EGL_LUMINANCE_SIZE:
+        case EGL_MATCH_NATIVE_PIXMAP:
+        case EGL_NATIVE_RENDERABLE:
+        case EGL_MAX_SWAP_INTERVAL:
+        case EGL_MIN_SWAP_INTERVAL:
+        case EGL_RED_SIZE:
+        case EGL_SAMPLE_BUFFERS:
+        case EGL_SAMPLES:
+        case EGL_STENCIL_SIZE:
+        case EGL_RENDERABLE_TYPE:
+        case EGL_SURFACE_TYPE:
+        case EGL_MULTISAMPLE_RESOLVE_BOX_BIT:
+        case EGL_PBUFFER_BIT:
+        case EGL_PIXMAP_BIT:
+        case EGL_SWAP_BEHAVIOR_PRESERVED_BIT:
+        case EGL_VG_ALPHA_FORMAT_PRE_BIT:
+        case EGL_VG_COLORSPACE_LINEAR_BIT:
+        case EGL_WINDOW_BIT:
+        case EGL_TRANSPARENT_TYPE:
+        case EGL_TRANSPARENT_RED_VALUE:
+        case EGL_TRANSPARENT_GREEN_VALUE:
+        case EGL_TRANSPARENT_BLUE_VALUE:
+          break;
+        default:
+          return false;
+      }
+    }
+  }
+  return true;
+}
+
 }  // namespace egl