Add EGL initialization unit test.

tests/unittests/BUILD.gn

@@ -16,8 +16,8 @@ import("//testing/test.gni")
 
 test("swiftshader_unittests") {
   deps = [
-    "../../src/OpenGL/libEGL:swiftshader_libEGL",
-    "../../src/OpenGL/libGLESv2:swiftshader_libGLESv2",
+    "//third_party/swiftshader/src/OpenGL/libEGL:swiftshader_libEGL",
+    "//third_party/swiftshader/src/OpenGL/libGLESv2:swiftshader_libGLESv2",
     "//base",
     "//base/test:test_support",
     "//testing/gmock",
@@ -28,4 +28,26 @@ test("swiftshader_unittests") {
     "//gpu/swiftshader_tests_main.cc",
     "unittests.cpp",
   ]
+
+  include_dirs = [
+    "../../include",   # Khronos headers
+  ]
+
+  # Make sure we're loading SwiftShader's libraries, not ANGLE's or the system
+  # provided ones. On Windows an explicit LoadLibrary("swiftshader\lib*.dll")
+  # is required before making the first EGL or OpenGL ES call.
+  if (is_win) {
+    ldflags = [
+      "/DELAYLOAD:libEGL.dll",
+      "/DELAYLOAD:libGLESv2.dll",
+    ]
+  } else if (is_mac) {
+    ldflags = [
+      "-Wl,-install_name,@rpath/\$ORIGIN/swiftshader",
+    ]
+  } else {
+    ldflags = [
+      "-Wl,-rpath=\$ORIGIN/swiftshader",
+    ]
+  }
 }

tests/unittests/SubmoduleCheck/gtest/gtest.h

-// These are not the headers you're looking for
-#error "Missing googletest submodule. Run git submodule update --init"
\ No newline at end of file

tests/unittests/unittests.cpp

@@ -13,7 +13,61 @@
 // limitations under the License.
 
 #include "gtest/gtest.h"
+#include "gmock/gmock.h"
 
-TEST(SwiftShaderCompilationOnly, Unit) {
+#include <EGL/egl.h>
+#include <GLES2/gl2.h>
+
+#if defined(_WIN32)
+#include <Windows.h>
+#endif
+
+class SwiftShaderTest : public testing::Test
+{
+protected:
+	void SetUp() override
+	{
+		#if defined(_WIN32)
+			// The DLLs are delay loaded (see BUILD.gn), so we can load
+			// the correct ones from the swiftshader subdirectory.
+			HMODULE libEGL = LoadLibraryA("swiftshader\\libEGL.dll");
+			EXPECT_NE(NULL, libEGL);
+
+			HMODULE libGLESv2 = LoadLibraryA("swiftshader\\libGLESv2.dll");
+			EXPECT_NE(NULL, libGLESv2);
+		#endif
+	}
+};
+
+TEST_F(SwiftShaderTest, CompilationOnly)
+{
 	// Empty test to trigger compilation of SwiftShader on build bots
 }
+
+TEST_F(SwiftShaderTest, Initalization)
+{
+	EXPECT_EQ(EGL_SUCCESS, eglGetError());
+
+	EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
+	EXPECT_EQ(EGL_SUCCESS, eglGetError());
+	EXPECT_NE(EGL_NO_DISPLAY, display);
+
+	eglQueryString(display, EGL_VENDOR);
+	EXPECT_EQ(EGL_NOT_INITIALIZED, eglGetError());
+
+	EGLint major;
+	EGLint minor;
+	EGLBoolean initialized = eglInitialize(display, &major, &minor);
+	EXPECT_EQ(EGL_SUCCESS, eglGetError());
+	EXPECT_EQ((EGLBoolean)EGL_TRUE, initialized);
+	EXPECT_EQ(1, major);
+	EXPECT_EQ(4, minor);
+
+	const char *vendor = eglQueryString(display, EGL_VENDOR);
+	EXPECT_EQ(EGL_SUCCESS, eglGetError());
+	EXPECT_STREQ("Google Inc.", vendor);
+
+	const char *version = eglQueryString(display, EGL_VERSION);
+	EXPECT_EQ(EGL_SUCCESS, eglGetError());
+	EXPECT_THAT(version, testing::HasSubstr("1.4 SwiftShader "));
+}