Command Buffer: read pixels into pixel pack buffer

gpu/command_buffer/service/gles2_cmd_decoder_unittest_framebuffers.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder_unittest_framebuffers.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_framebuffers.cc b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_framebuffers.cc
index ce6fbb8c83b5e44c6f4c950f7dc0623d7bc65733..f7734a8b2a52461dcc21dee4d1d7e7d3005cdadb 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_framebuffers.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_framebuffers.cc
@@ -660,6 +660,157 @@ TEST_P(GLES2DecoderTest, ReadPixels) {
   }
 }
 
+TEST_P(GLES3DecoderTest, ReadPixels2PixelPackBufferNoBufferBound) {
+  const GLsizei kWidth = 5;
+  const GLsizei kHeight = 3;
+  EXPECT_CALL(*gl_, ReadPixels(_, _, _, _, _, _, _)).Times(0);
+
+  ReadPixels cmd;
+  cmd.Init(0,
+           0,
+           kWidth,
+           kHeight,
+           GL_RGBA,
+           GL_UNSIGNED_BYTE,
+           0,
+           0,
+           0,
+           0,
+           false);
+  EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
+}
+
+TEST_P(GLES3DecoderTest, ReadPixelsBufferBound) {
+  const GLsizei kWidth = 5;
+  const GLsizei kHeight = 3;
+  const GLint kBytesPerPixel = 4;
+  GLint size = kWidth * kHeight * kBytesPerPixel;
+  EXPECT_CALL(*gl_, ReadPixels(_, _, _, _, _, _, _)).Times(0);
+  typedef ReadPixels::Result Result;
+  Result* result = GetSharedMemoryAs<Result*>();
+  uint32 result_shm_id = kSharedMemoryId;
+  uint32 result_shm_offset = kSharedMemoryOffset;
+  uint32 pixels_shm_id = kSharedMemoryId;
+  uint32 pixels_shm_offset = kSharedMemoryOffset + sizeof(*result);
+
+  DoBindBuffer(GL_PIXEL_PACK_BUFFER, client_buffer_id_, kServiceBufferId);
+  DoBufferData(GL_PIXEL_PACK_BUFFER, size);
+
+  ReadPixels cmd;
+  cmd.Init(0,
+           0,
+           kWidth,
+           kHeight,
+           GL_RGBA,
+           GL_UNSIGNED_BYTE,
+           pixels_shm_id,
+           pixels_shm_offset,
+           result_shm_id,
+           result_shm_offset,
+           false);
+  EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
+}
+
+TEST_P(GLES3DecoderTest, ReadPixels2PixelPackBuffer) {
+  const GLsizei kWidth = 5;
+  const GLsizei kHeight = 3;
+  const GLint kBytesPerPixel = 4;
+  GLint size = kWidth * kHeight * kBytesPerPixel;
+
+  DoBindBuffer(GL_PIXEL_PACK_BUFFER, client_buffer_id_, kServiceBufferId);
+  DoBufferData(GL_PIXEL_PACK_BUFFER, size);
+
+  EXPECT_CALL(*gl_, GetError())
+      .WillOnce(Return(GL_NO_ERROR))
+      .WillOnce(Return(GL_NO_ERROR))
+      .RetiresOnSaturation();
+  EXPECT_CALL(*gl_,
+              ReadPixels(0, 0, kWidth, kHeight, GL_RGBA, GL_UNSIGNED_BYTE, _));
+  ReadPixels cmd;
+  cmd.Init(0,
+           0,
+           kWidth,
+           kHeight,
+           GL_RGBA,
+           GL_UNSIGNED_BYTE,
+           0,
+           0,
+           0,
+           0,
+           false);
+  EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
+  EXPECT_EQ(GL_NO_ERROR, GetGLError());
+}
+
+TEST_P(GLES3DecoderTest, ReadPixelsPixelPackBufferMapped) {
+  const GLsizei kWidth = 5;
+  const GLsizei kHeight = 3;
+  const GLint kBytesPerPixel = 4;
+  GLint size = kWidth * kHeight * kBytesPerPixel;
+
+  DoBindBuffer(GL_PIXEL_PACK_BUFFER, client_buffer_id_, kServiceBufferId);
+
+  uint32_t result_shm_id = kSharedMemoryId;
+  uint32_t result_shm_offset = kSharedMemoryOffset;
+  uint32_t data_shm_id = kSharedMemoryId;
+  // uint32_t is Result for both MapBufferRange and UnmapBuffer commands.
+  uint32_t data_shm_offset = kSharedMemoryOffset + sizeof(uint32_t);
+  EXPECT_CALL(*gl_,
+              MapBufferRange(GL_PIXEL_PACK_BUFFER, 0, size, GL_MAP_READ_BIT))
+        .RetiresOnSaturation();
+  MapBufferRange map_buffer_range;
+  map_buffer_range.Init(GL_PIXEL_PACK_BUFFER, 0, size, GL_MAP_READ_BIT,
+                        data_shm_id, data_shm_offset,
+                        result_shm_id, result_shm_offset);
+  EXPECT_EQ(error::kNoError, ExecuteCmd(map_buffer_range));
+  EXPECT_EQ(GL_NO_ERROR, GetGLError());
+
+  EXPECT_CALL(*gl_, ReadPixels(_, _, _, _, _, _, _)).Times(0);
+  ReadPixels cmd;
+  cmd.Init(0,
+           0,
+           kWidth,
+           kHeight,
+           GL_RGBA,
+           GL_UNSIGNED_BYTE,
+           0,
+           0,
+           0,
+           0,
+           false);
+  EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
+}
+
+TEST_P(GLES3DecoderTest, ReadPixelsPixelPackBufferIsNotLargeEnough) {
+  const GLsizei kWidth = 5;
+  const GLsizei kHeight = 3;
+  const GLint kBytesPerPixel = 4;
+  GLint size = kWidth * kHeight * kBytesPerPixel;
+
+  DoBindBuffer(GL_PIXEL_PACK_BUFFER, client_buffer_id_, kServiceBufferId);
+
+  DoBufferData(GL_PIXEL_PACK_BUFFER, size - 4);
+  EXPECT_CALL(*gl_, ReadPixels(_, _, _, _, _, _, _)).Times(0);
+
+  ReadPixels cmd;
+  cmd.Init(0,
+           0,
+           kWidth,
+           kHeight,
+           GL_RGBA,
+           GL_UNSIGNED_BYTE,
+           0,
+           0,
+           0,
+           0,
+           false);
+  EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
+}
+
 TEST_P(GLES2DecoderRGBBackbufferTest, ReadPixelsNoAlphaBackbuffer) {
   const GLsizei kWidth = 3;
   const GLsizei kHeight = 3;