1 files changed, 91 insertions, 0 deletions
diff --git a/gpu/command_buffer/tests/gl_iosurface_readback_workaround_unittest.cc b/gpu/command_buffer/tests/gl_iosurface_readback_workaround_unittest.cc
new file mode 100644
index 0000000..6a1a7c6
--- /dev/null
+++ b/gpu/command_buffer/tests/gl_iosurface_readback_workaround_unittest.cc
@@ -0,0 +1,91 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef GL_GLEXT_PROTOTYPES
+#define GL_GLEXT_PROTOTYPES
+#endif
+
+#include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+#include <GLES2/gl2extchromium.h>
+
+#include "base/command_line.h"
+#include "base/strings/string_number_conversions.h"
+#include "build/build_config.h"
+#include "gpu/command_buffer/tests/gl_manager.h"
+#include "gpu/command_buffer/tests/gl_test_utils.h"
+#include "gpu/config/gpu_switches.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace gpu {
+
+#if defined(OS_MACOSX)
+// A test that exercises the glReadPixels workaround for IOSurface backed
+// textures.
+class GLIOSurfaceReadbackWorkaroundTest : public testing::Test {
+ public:
+  GLIOSurfaceReadbackWorkaroundTest() {}
+
+ protected:
+  void SetUp() override {
+      base::CommandLine command_line(0, NULL);
+      command_line.AppendSwitchASCII(
+          switches::kGpuDriverBugWorkarounds,
+          base::IntToString(gpu::IOSURFACE_READBACK_WORKAROUND));
+      gl_.InitializeWithCommandLine(GLManager::Options(), &command_line);
+      gl_.set_use_iosurface_memory_buffers(true);
+      DCHECK(gl_.workarounds().iosurface_readback_workaround);
+  }
+
+  void TearDown() override {
+    GLTestHelper::CheckGLError("no errors", __LINE__);
+    gl_.Destroy();
+  }
+
+  GLManager gl_;
+};
+
+TEST_F(GLIOSurfaceReadbackWorkaroundTest, ReadPixels) {
+  int width = 1;
+  int height = 1;
+  GLuint source_texture = 0;
+  GLenum source_target = GL_TEXTURE_RECTANGLE_ARB;
+  glGenTextures(1, &source_texture);
+  glBindTexture(source_target, source_texture);
+  glTexParameteri(source_target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  glTexParameteri(source_target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+  GLuint image_id = glCreateGpuMemoryBufferImageCHROMIUM(
+      width, height, GL_BGRA_EXT, GL_READ_WRITE_CHROMIUM);
+  ASSERT_NE(0u, image_id);
+  glBindTexImage2DCHROMIUM(source_target, image_id);
+
+  GLuint framebuffer = 0;
+  glGenFramebuffers(1, &framebuffer);
+  glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
+  glFramebufferTexture2D(
+      GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, source_target, source_texture, 0);
+  EXPECT_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
+            glCheckFramebufferStatus(GL_FRAMEBUFFER));
+
+  glClearColor(33.0 / 255.0, 44.0 / 255.0, 55.0 / 255.0, 66.0 / 255.0);
+  glClear(GL_COLOR_BUFFER_BIT);
+  const uint8_t expected[4] = {33, 44, 55, 66};
+  EXPECT_TRUE(
+      GLTestHelper::CheckPixels(0, 0, 1, 1, 1 /* tolerance */, expected));
+
+  glClearColor(14.0 / 255.0, 15.0 / 255.0, 16.0 / 255.0, 17.0 / 255.0);
+  glClear(GL_COLOR_BUFFER_BIT);
+  const uint8_t expected2[4] = {14, 15, 16, 17};
+  EXPECT_TRUE(
+      GLTestHelper::CheckPixels(0, 0, 1, 1, 1 /* tolerance */, expected2));
+
+  glReleaseTexImage2DCHROMIUM(source_target, image_id);
+  glDestroyImageCHROMIUM(image_id);
+  glDeleteTextures(1, &source_texture);
+  glDeleteFramebuffers(1, &framebuffer);
+}
+
+#endif  // defined(OS_MACOSX)
+
+}  // namespace gpu