Command buffer: feedback loop detection for CopyTexSubImage3D

gpu/command_buffer/service/gles2_cmd_decoder_unittest_textures.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder_unittest_textures.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_textures.cc b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_textures.cc
index 22d8a1d0cd0fe4ab8aec888030208e4de533f284..b1d478ccafcfea618860f0ac5a5aefbf7a64c7f4 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_textures.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_textures.cc
@@ -1213,6 +1213,161 @@ TEST_P(GLES3DecoderTest, CopyTexSubImage3DCheckArgs) {
   EXPECT_EQ(GL_INVALID_VALUE, GetGLError());
 }
 
+TEST_P(GLES3DecoderTest, CopyTexSubImage3DFeedbackLoopSucceeds0) {
+  const GLenum kTarget = GL_TEXTURE_3D;
+  const GLint kInternalFormat = GL_RGB8;
+  const GLint kXoffset = 0;
+  const GLint kYoffset = 0;
+  const GLint kZoffset = 0;
+  const GLint kX = 0;
+  const GLint kY = 0;
+  const GLsizei kWidth = 2;
+  const GLsizei kHeight = 2;
+  const GLsizei kDepth = 2;
+  const GLsizei kBorder = 0;
+  const GLenum kFormat = GL_RGB;
+  const GLenum kType = GL_UNSIGNED_BYTE;
+
+  DoBindTexture(kTarget, client_texture_id_, kServiceTextureId);
+  DoBindFramebuffer(
+      GL_FRAMEBUFFER, client_framebuffer_id_, kServiceFramebufferId);
+
+  FramebufferTextureLayer tex_layer;
+  CopyTexSubImage3D cmd;
+
+  // The source and the target for CopyTexSubImage3D are the same 3d texture.
+  // But level of 3D texture != level of read attachment in fbo.
+  GLint kLevel = 0;
+  GLint kLayer = 0; // kZoffset is 0
+  EXPECT_CALL(*gl_, FramebufferTextureLayer(GL_FRAMEBUFFER,
+                                            GL_COLOR_ATTACHMENT0,
+                                            kServiceTextureId, kLevel, kLayer))
+      .Times(1)
+      .RetiresOnSaturation();
+  DoTexImage3D(kTarget, kLevel, kInternalFormat, kWidth, kHeight, kDepth,
+               kBorder, kFormat, kType, kSharedMemoryId, kSharedMemoryOffset);
+  tex_layer.Init(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, client_texture_id_,
+                 kLevel, kLayer);
+  EXPECT_EQ(error::kNoError, ExecuteCmd(tex_layer));
+  EXPECT_EQ(GL_NO_ERROR, GetGLError());
+
+  kLevel = 1;
+  EXPECT_CALL(*gl_, CheckFramebufferStatusEXT(_))
+      .WillOnce(Return(GL_FRAMEBUFFER_COMPLETE))
+      .RetiresOnSaturation();
+  EXPECT_CALL(*gl_,
+              CopyTexSubImage3D(kTarget, kLevel, kXoffset, kYoffset, kZoffset,
+                                kX, kY, kWidth, kHeight))
+      .Times(1)
+      .RetiresOnSaturation();
+  DoTexImage3D(kTarget, kLevel, kInternalFormat, kWidth, kHeight, kDepth,
+               kBorder, kFormat, kType, kSharedMemoryId, kSharedMemoryOffset);
+  cmd.Init(kTarget, kLevel, kXoffset, kYoffset, kZoffset,
+           kX, kY, kWidth, kHeight);
+  EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
+  EXPECT_EQ(GL_NO_ERROR, GetGLError());
+}
+
+TEST_P(GLES3DecoderTest, CopyTexSubImage3DFeedbackLoopSucceeds1) {
+  const GLenum kTarget = GL_TEXTURE_3D;
+  const GLint kInternalFormat = GL_RGB8;
+  const GLint kXoffset = 0;
+  const GLint kYoffset = 0;
+  const GLint kZoffset = 0;
+  const GLint kX = 0;
+  const GLint kY = 0;
+  const GLsizei kWidth = 2;
+  const GLsizei kHeight = 2;
+  const GLsizei kDepth = 2;
+  const GLsizei kBorder = 0;
+  const GLenum kFormat = GL_RGB;
+  const GLenum kType = GL_UNSIGNED_BYTE;
+
+  DoBindTexture(kTarget, client_texture_id_, kServiceTextureId);
+  DoBindFramebuffer(
+      GL_FRAMEBUFFER, client_framebuffer_id_, kServiceFramebufferId);
+
+  FramebufferTextureLayer tex_layer;
+  CopyTexSubImage3D cmd;
+
+  // The source and the target for CopyTexSubImage3D are the same 3d texture.
+  // But zoffset of 3D texture != layer of read attachment in fbo.
+  GLint kLevel = 0;
+  GLint kLayer = 1; // kZoffset is 0
+  EXPECT_CALL(*gl_, FramebufferTextureLayer(GL_FRAMEBUFFER,
+                                            GL_COLOR_ATTACHMENT0,
+                                            kServiceTextureId, kLevel, kLayer))
+      .Times(1)
+      .RetiresOnSaturation();
+  DoTexImage3D(kTarget, kLevel, kInternalFormat, kWidth, kHeight, kDepth,
+               kBorder, kFormat, kType, kSharedMemoryId, kSharedMemoryOffset);
+  tex_layer.Init(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, client_texture_id_,
+                 kLevel, kLayer);
+  EXPECT_EQ(error::kNoError, ExecuteCmd(tex_layer));
+  EXPECT_EQ(GL_NO_ERROR, GetGLError());
+
+  EXPECT_CALL(*gl_, CheckFramebufferStatusEXT(_))
+      .WillOnce(Return(GL_FRAMEBUFFER_COMPLETE))
+      .RetiresOnSaturation();
+  EXPECT_CALL(*gl_,
+              CopyTexSubImage3D(kTarget, kLevel, kXoffset, kYoffset, kZoffset,
+                                kX, kY, kWidth, kHeight))
+      .Times(1)
+      .RetiresOnSaturation();
+  cmd.Init(kTarget, kLevel, kXoffset, kYoffset, kZoffset,
+           kX, kY, kWidth, kHeight);
+  EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
+  EXPECT_EQ(GL_NO_ERROR, GetGLError());
+}
+
+TEST_P(GLES3DecoderTest, CopyTexSubImage3DFeedbackLoopFails) {
+  const GLenum kTarget = GL_TEXTURE_3D;
+  const GLint kInternalFormat = GL_RGB8;
+  const GLint kXoffset = 0;
+  const GLint kYoffset = 0;
+  const GLint kZoffset = 0;
+  const GLint kX = 0;
+  const GLint kY = 0;
+  const GLsizei kWidth = 2;
+  const GLsizei kHeight = 2;
+  const GLsizei kDepth = 2;
+  const GLsizei kBorder = 0;
+  const GLenum kFormat = GL_RGB;
+  const GLenum kType = GL_UNSIGNED_BYTE;
+
+  DoBindTexture(kTarget, client_texture_id_, kServiceTextureId);
+  DoBindFramebuffer(
+      GL_FRAMEBUFFER, client_framebuffer_id_, kServiceFramebufferId);
+
+  FramebufferTextureLayer tex_layer;
+  CopyTexSubImage3D cmd;
+
+  // The source and the target for CopyTexSubImage3D are the same 3d texture.
+  // And level / zoffset of 3D texture equal to level / layer of read attachment
+  // in fbo.
+  GLint kLevel = 1;
+  GLint kLayer = 0; // kZoffset is 0
+  EXPECT_CALL(*gl_, FramebufferTextureLayer(GL_FRAMEBUFFER,
+                                            GL_COLOR_ATTACHMENT0,
+                                            kServiceTextureId, kLevel, kLayer))
+      .Times(1)
+      .RetiresOnSaturation();
+  DoTexImage3D(kTarget, kLevel, kInternalFormat, kWidth, kHeight, kDepth,
+               kBorder, kFormat, kType, kSharedMemoryId, kSharedMemoryOffset);
+  tex_layer.Init(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, client_texture_id_,
+                 kLevel, kLayer);
+  EXPECT_EQ(error::kNoError, ExecuteCmd(tex_layer));
+  EXPECT_EQ(GL_NO_ERROR, GetGLError());
+
+  EXPECT_CALL(*gl_, CheckFramebufferStatusEXT(_))
+      .WillOnce(Return(GL_FRAMEBUFFER_COMPLETE))
+      .RetiresOnSaturation();
+  cmd.Init(kTarget, kLevel, kXoffset, kYoffset, kZoffset,
+           kX, kY, kWidth, kHeight);
+  EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
+}
+
 TEST_P(GLES3DecoderTest, CompressedTexImage3DFailsWithBadImageSize) {
   const uint32_t kBucketId = 123;
   const GLenum kTarget = GL_TEXTURE_2D_ARRAY;