Use client side arrays for GL_STREAM_DRAW attributes

gpu/command_buffer/tests/gl_stream_draw_unittests.cc

Index: gpu/command_buffer/tests/gl_stream_draw_unittests.cc
diff --git a/gpu/command_buffer/tests/gl_stream_draw_unittests.cc b/gpu/command_buffer/tests/gl_stream_draw_unittests.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3997016903cdd55d2e4c938f0f84c7baa96ea7db
--- /dev/null
+++ b/gpu/command_buffer/tests/gl_stream_draw_unittests.cc
@@ -0,0 +1,157 @@
+// Copyright (c) 2013 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 <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+
+#include "gpu/command_buffer/tests/gl_manager.h"
+#include "gpu/command_buffer/tests/gl_test_utils.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+
+#define SHADER(Src) #Src
+
+namespace gpu {
+
+class GLStreamDrawTest : public testing::Test {
+ protected:
+  static const int kSize = 4;
+
+  virtual void SetUp() {
+    GLManager::Options options;
+    options.size = gfx::Size(kSize, kSize);
+    gl_.Initialize(options);
+  }
+
+  virtual void TearDown() {
+    gl_.Destroy();
+  }
+
+  GLManager gl_;
+};
+
+namespace {
+
+GLuint SetupProgram() {
+  static const char* v_shader_str = SHADER(
+      attribute vec4 a_position;
+      attribute vec4 a_color;
+      varying vec4 v_color;
+      void main()
+      {
+         gl_Position = a_position;
+         v_color = a_color;
+      }
+   );
+
+  static const char* f_shader_str = SHADER(
+      precision mediump float;
+      varying vec4 v_color;
+      void main()
+      {
+        gl_FragColor = v_color;
+      }
+  );
+
+  GLuint program = GLTestHelper::LoadProgram(v_shader_str, f_shader_str);
+  glUseProgram(program);
+  return program;
+}
+
+}  // anonymous namespace.
+
+TEST_F(GLStreamDrawTest, Basic) {
+  static GLfloat float_red[4] = { 1.0f, 0.0f, 0.0f, 1.0f, };
+  static GLfloat float_green[4] = { 0.0f, 1.0f, 0.0f, 1.0f, };
+  static uint8 expected_red[4] =  {255, 0, 0, 255, };
+  static uint8 expected_green[4] =  {0, 255, 0, 255, };
+
+  GLuint program = SetupProgram();
+  GLuint position_loc = glGetAttribLocation(program, "a_position");
+  GLuint color_loc = glGetAttribLocation(program, "a_color");
+  GLTestHelper::SetupUnitQuad(position_loc);
+  GLTestHelper::SetupColorsForUnitQuad(color_loc, float_red, GL_STREAM_DRAW);
+  glDrawArrays(GL_TRIANGLES, 0, 6);
+  EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize, kSize, 0, expected_red));
+  GLTestHelper::SetupColorsForUnitQuad(color_loc, float_green, GL_STATIC_DRAW);
+  glDrawArrays(GL_TRIANGLES, 0, 6);
+  EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize, kSize, 0, expected_green));
+
+  GLTestHelper::CheckGLError("no errors", __LINE__);
+}
+
+TEST_F(GLStreamDrawTest, DrawElements) {
+  static GLfloat float_red[4] = { 1.0f, 0.0f, 0.0f, 1.0f, };
+  static GLfloat float_green[4] = { 0.0f, 1.0f, 0.0f, 1.0f, };
+  static uint8 expected_red[4] =  {255, 0, 0, 255, };
+  static uint8 expected_green[4] =  {0, 255, 0, 255, };
+
+  GLuint program = SetupProgram();
+  GLuint position_loc = glGetAttribLocation(program, "a_position");
+  GLuint color_loc = glGetAttribLocation(program, "a_color");
+  GLTestHelper::SetupUnitQuad(position_loc);
+  GLTestHelper::SetupColorsForUnitQuad(color_loc, float_red, GL_STREAM_DRAW);
+
+  GLuint index_buffer = 0;
+  glGenBuffers(1, &index_buffer);
+  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, index_buffer);
+  static GLubyte indices[] = { 0, 1, 2, 3, 4, 5, };
+  glBufferData(
+      GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STREAM_DRAW);
+  glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, NULL);
+  EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize, kSize, 0, expected_red));
+  GLTestHelper::SetupColorsForUnitQuad(color_loc, float_green, GL_STATIC_DRAW);
+
+  glBufferData(
+      GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
+  glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, NULL);
+  EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize, kSize, 0, expected_green));
+
+  GLTestHelper::CheckGLError("no errors", __LINE__);
+}
+
+TEST_F(GLStreamDrawTest, VertexArrayObjects) {
+  if (!GLTestHelper::HasExtension("GL_OES_vertex_array_object")) {
+    return;
+  }
+
+  static GLfloat float_red[4] = { 1.0f, 0.0f, 0.0f, 1.0f, };
+  static GLfloat float_green[4] = { 0.0f, 1.0f, 0.0f, 1.0f, };
+  static uint8 expected_red[4] =  {255, 0, 0, 255, };
+  static uint8 expected_green[4] =  {0, 255, 0, 255, };
+
+  GLuint program = SetupProgram();
+  GLuint position_loc = glGetAttribLocation(program, "a_position");
+  GLuint color_loc = glGetAttribLocation(program, "a_color");
+
+  GLuint vaos[2];
+  glGenVertexArraysOES(2, vaos);
+
+  glBindVertexArrayOES(vaos[0]);
+  GLuint position_buffer = GLTestHelper::SetupUnitQuad(position_loc);
+  GLTestHelper::SetupColorsForUnitQuad(color_loc, float_red, GL_STREAM_DRAW);
+
+  glBindVertexArrayOES(vaos[1]);
+  glBindBuffer(GL_ARRAY_BUFFER, position_buffer);
+  glEnableVertexAttribArray(position_loc);
+  glVertexAttribPointer(position_loc, 2, GL_FLOAT, GL_FALSE, 0, 0);
+  GLTestHelper::SetupColorsForUnitQuad(color_loc, float_green, GL_STATIC_DRAW);
+
+  for (int ii = 0; ii < 2; ++ii) {
+    glBindVertexArrayOES(vaos[0]);
+    glDrawArrays(GL_TRIANGLES, 0, 6);
+    EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize, kSize, 0, expected_red));
+
+    glBindVertexArrayOES(vaos[1]);
+    glDrawArrays(GL_TRIANGLES, 0, 6);
+    EXPECT_TRUE(
+        GLTestHelper::CheckPixels(0, 0, kSize, kSize, 0, expected_green));
+  }
+
+  GLTestHelper::CheckGLError("no errors", __LINE__);
+}
+
+}  // namespace gpu
+