Allow textures to be moved from one GL context group to another.

gpu/command_buffer/tests/gl_unittests.cc

 // Copyright (c) 2012 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.
 
+#define GL_GLEXT_PROTOTYPES
+
 #include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
 
+#include "gpu/command_buffer/service/mailbox_manager.h"
 #include "gpu/command_buffer/tests/gl_manager.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "ui/gfx/gl/gl_share_group.h"
 
 namespace gpu {
 
+namespace {
+uint32 ReadTexel(GLuint id, GLint x, GLint y) {
+  GLint old_fbo = 0;
+  glGetIntegerv(GL_FRAMEBUFFER_BINDING, &old_fbo);
+
+  GLuint fbo;
+  glGenFramebuffers(1, &fbo);
+  glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+  glFramebufferTexture2D(GL_FRAMEBUFFER,
+                         GL_COLOR_ATTACHMENT0,
+                         GL_TEXTURE_2D,
+                         id,
+                         0);
+  EXPECT_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
+
+  uint32 texel;
+  glReadPixels(x, y, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, &texel);
+
+  glBindFramebuffer(GL_FRAMEBUFFER, old_fbo);
+
+  glDeleteFramebuffers(1, &fbo);
+
+  return texel;
+}
+}
+
 class GLTest : public testing::Test {
  protected:
+  GLTest() : gl_(new gles2::MailboxManager, new gfx::GLShareGroup) {
+  }
+
   virtual void SetUp() {
     gl_.Initialize(gfx::Size(4, 4));
   }
 
   virtual void TearDown() {
     gl_.Destroy();
   }
 
   GLManager gl_;
 };
 
 // Test that GL is at least minimally working.
 TEST_F(GLTest, Basic) {
   glClearColor(0.0f, 1.0f, 0.0f, 1.0f);
   glClear(GL_COLOR_BUFFER_BIT);
   uint8 pixels[4] = { 0, };
   glReadPixels(0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
   EXPECT_EQ(0u, pixels[0]);
   EXPECT_EQ(255u, pixels[1]);
   EXPECT_EQ(0u, pixels[2]);
   EXPECT_EQ(255u, pixels[3]);
 }
 
+TEST_F(GLTest, ProduceAndConsumeTexture) {

[Ken Russell (switch to Gerrit), 2012/04/26 01:10:53]

Nice test!

+  GLManager gl2(gl_.mailbox_manager(), gl_.share_group());
+  gl2.Initialize(gfx::Size(1, 1));
+
+  char mailbox[32];

[Ken Russell (switch to Gerrit), 2012/04/26 01:10:53]

Really wish the "32" could be part of the type.

+  glGenMailboxCHROMIUM(mailbox);
+
+  gl_.MakeCurrent();
+
+  GLuint tex1;
+  glGenTextures(1, &tex1);
+
+  glBindTexture(GL_TEXTURE_2D, tex1);
+  uint32 source_pixel = 0xFF0000FF;
+  glTexImage2D(GL_TEXTURE_2D,
+               0,
+               GL_RGBA,
+               1, 1,
+               0,
+               GL_RGBA,
+               GL_UNSIGNED_BYTE,
+               &source_pixel);
+
+  glProduceTextureCHROMIUM(GL_TEXTURE_2D, mailbox);
+  glFlush();
+
+  gl2.MakeCurrent();
+
+  GLuint tex2;
+  glGenTextures(1, &tex2);
+
+  glBindTexture(GL_TEXTURE_2D, tex2);
+  glConsumeTextureCHROMIUM(GL_TEXTURE_2D, mailbox);
+  EXPECT_EQ(source_pixel, ReadTexel(tex2, 0, 0));
+  glProduceTextureCHROMIUM(GL_TEXTURE_2D, mailbox);
+  glFlush();
+
+  gl_.MakeCurrent();
+
+  glBindTexture(GL_TEXTURE_2D, tex1);
+  glConsumeTextureCHROMIUM(GL_TEXTURE_2D, mailbox);
+  EXPECT_EQ(source_pixel, ReadTexel(tex1, 0, 0));
+
+  gl2.Destroy();
+}
+
 }  // namespace gpu