Command Buffer: read pixels into pixel pack buffer

gpu/command_buffer/service/gles2_cmd_decoder_unittest_framebuffers.cc

 // Copyright 2014 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.
 
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "gpu/command_buffer/common/gles2_cmd_format.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
@@ skipping 642 matching lines @@
            result_shm_id,
            result_shm_offset,
            false);
   EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
   for (GLint yy = 0; yy < kHeight; ++yy) {
     EXPECT_TRUE(emu.CompareRowSegment(
         0, yy, kWidth, emu.ComputePackAlignmentAddress(0, yy, kWidth, dest)));
   }
 }
 
+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, ReadPixels2BufferBound) {
+  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(GLES2DecoderRGBBackbufferTest, ReadPixelsNoAlphaBackbuffer) {
   const GLsizei kWidth = 3;
   const GLsizei kHeight = 3;
   const GLint kBytesPerPixel = 4;
   const GLint kPackAlignment = 4;
   static const uint8 kExpectedPixels[kWidth * kHeight * kBytesPerPixel] = {
       12, 13, 14, 255, 19, 18, 19, 255, 13, 14, 18, 255,
       29, 28, 23, 255, 21, 22, 21, 255, 28, 23, 22, 255,
       31, 34, 39, 255, 32, 37, 32, 255, 34, 39, 37, 255,
   };
@@ skipping 2244 matching lines @@
   EXPECT_EQ(1, result->GetNumResults());
   EXPECT_EQ(GL_NO_ERROR, GetGLError());
 }
 
 // TODO(gman): PixelStorei
 
 // TODO(gman): SwapBuffers
 
 }  // namespace gles2
 }  // namespace gpu