gpu/command_buffer/tests/gl_chromium_path_rendering_unittest.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.

#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <GLES2/gl2extchromium.h>
#include <cmath>

#include "base/command_line.h"
#include "gpu/command_buffer/service/gpu_switches.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 CHROMIUMPathRenderingTest : public testing::Test {
 public:
  static const GLsizei kResolution = 100;

 protected:
  void SetUp() override {
    GLManager::Options options;
    options.size = gfx::Size(kResolution, kResolution);
    base::CommandLine command_line(*base::CommandLine::ForCurrentProcess());
    command_line.AppendSwitch(switches::kEnableGLPathRendering);
    gl_.InitializeWithCommandLine(options, &command_line);
  }

  void TearDown() override { gl_.Destroy(); }

  void ExpectEqualMatrix(const GLfloat* expected, const GLfloat* actual) {
    for (size_t i = 0; i < 16; ++i) {
      EXPECT_EQ(expected[i], actual[i]);
    }
  }
  void ExpectEqualMatrix(const GLfloat* expected, const GLint* actual) {
    for (size_t i = 0; i < 16; ++i) {
      EXPECT_EQ(static_cast<GLint>(round(expected[i])), actual[i]);
    }
  }

  void SetupStateForTestPattern() {
    glViewport(0, 0, kResolution, kResolution);
    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    glStencilMask(0xffffffff);
    glClearStencil(0);
    glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);

    static const char* kVertexShaderSource =
        SHADER(void main() { gl_Position = vec4(1); });
    static const char* kFragmentShaderSource =
        SHADER(precision mediump float; uniform vec4 color;
               void main() { gl_FragColor = color; });

    GLuint program =
        GLTestHelper::LoadProgram(kVertexShaderSource, kFragmentShaderSource);
    glUseProgram(program);
    color_loc_ = glGetUniformLocation(program, "color");
    glDeleteProgram(program);

    // Set up orthogonal projection with near/far plane distance of 2.
    static GLfloat matrix[16] = {2.0f / (kResolution - 1),
                                 0.0f,
                                 0.0f,
                                 0.0f,
                                 0.0f,
                                 2.0f / (kResolution - 1),
                                 0.0f,
                                 0.0f,
                                 0.0f,
                                 0.0f,
                                 -1.0f,
                                 0.0f,
                                 -1.0f,
                                 -1.0f,
                                 0.0f,
                                 1.0f};
    glMatrixLoadfCHROMIUM(GL_PATH_PROJECTION_CHROMIUM, matrix);
    glMatrixLoadIdentityCHROMIUM(GL_PATH_MODELVIEW_CHROMIUM);

    glEnable(GL_STENCIL_TEST);

    GLTestHelper::CheckGLError("no errors at state setup", __LINE__);
  }

  void SetupPathStateForTestPattern(GLuint path) {
    static const GLubyte kCommands[] = {GL_MOVE_TO_CHROMIUM,
                                        GL_LINE_TO_CHROMIUM,
                                        GL_QUADRATIC_CURVE_TO_CHROMIUM,
                                        GL_CUBIC_CURVE_TO_CHROMIUM,
                                        GL_CLOSE_PATH_CHROMIUM};

    static const GLfloat kCoords[] = {50.0f,
                                      50.0f,
                                      75.0f,
                                      75.0f,
                                      100.0f,
                                      62.5f,
                                      50.0f,
                                      25.5f,
                                      0.0f,
                                      62.5f,
                                      50.0f,
                                      50.0f,
                                      25.0f,
                                      75.0f};

    glPathCommandsCHROMIUM(path, arraysize(kCommands), kCommands,
                           arraysize(kCoords), GL_FLOAT, kCoords);

    glPathParameterfCHROMIUM(path, GL_PATH_STROKE_WIDTH_CHROMIUM, 5.0f);
    glPathParameterfCHROMIUM(path, GL_PATH_MITER_LIMIT_CHROMIUM, 1.0f);
    glPathParameterfCHROMIUM(path, GL_PATH_STROKE_BOUND_CHROMIUM, .02f);
    glPathParameteriCHROMIUM(path, GL_PATH_JOIN_STYLE_CHROMIUM,
                             GL_ROUND_CHROMIUM);
    glPathParameteriCHROMIUM(path, GL_PATH_END_CAPS_CHROMIUM,
                             GL_SQUARE_CHROMIUM);
  }

  void VerifyTestPatternFill(float x, float y) {
    static const float kFillCoords[] = {
        55.0f, 55.0f, 50.0f, 28.0f, 66.0f, 63.0f};
    static const uint8 kBlue[] = {0, 0, 255, 255};

    for (size_t i = 0; i < arraysize(kFillCoords); i += 2) {
      float fx = kFillCoords[i];
      float fy = kFillCoords[i + 1];

      EXPECT_TRUE(GLTestHelper::CheckPixels(x + fx, y + fy, 1, 1, 0, kBlue));
    }
  }

  void VerifyTestPatternBg(float x, float y) {
    const float kBackgroundCoords[] = {80.0f, 80.0f, 20.0f, 20.0f, 90.0f, 1.0f};
    const uint8 kExpectedColor[] = {0, 0, 0, 0};

    for (size_t i = 0; i < arraysize(kBackgroundCoords); i += 2) {
      float bx = kBackgroundCoords[i];
      float by = kBackgroundCoords[i + 1];

      EXPECT_TRUE(
          GLTestHelper::CheckPixels(x + bx, y + by, 1, 1, 0, kExpectedColor));
    }
  }

  void VerifyTestPatternStroke(float x, float y) {
    // Inside the stroke we should have green.
    const uint8 kGreen[] = {0, 255, 0, 255};
    EXPECT_TRUE(GLTestHelper::CheckPixels(x + 50, y + 53, 1, 1, 0, kGreen));
    EXPECT_TRUE(GLTestHelper::CheckPixels(x + 26, y + 76, 1, 1, 0, kGreen));

    // Outside the path we should have black.
    const uint8 black[] = {0, 0, 0, 0};
    EXPECT_TRUE(GLTestHelper::CheckPixels(x + 10, y + 10, 1, 1, 0, black));
    EXPECT_TRUE(GLTestHelper::CheckPixels(x + 80, y + 80, 1, 1, 0, black));
  }

  void TryAllDrawFunctions(GLuint path, GLenum expected_error) {
    glStencilFillPathCHROMIUM(path, GL_COUNT_UP_CHROMIUM, 0x7F);
    EXPECT_EQ(expected_error, glGetError());

    glStencilFillPathCHROMIUM(path, GL_COUNT_UP_CHROMIUM, 0x7F);
    EXPECT_EQ(expected_error, glGetError());

    glStencilStrokePathCHROMIUM(path, 0x80, 0x80);
    EXPECT_EQ(expected_error, glGetError());

    glCoverFillPathCHROMIUM(path, GL_BOUNDING_BOX_CHROMIUM);
    EXPECT_EQ(expected_error, glGetError());

    glCoverStrokePathCHROMIUM(path, GL_BOUNDING_BOX_CHROMIUM);
    EXPECT_EQ(expected_error, glGetError());

    glStencilThenCoverStrokePathCHROMIUM(path, 0x80, 0x80,
                                         GL_BOUNDING_BOX_CHROMIUM);
    EXPECT_EQ(expected_error, glGetError());

    glStencilThenCoverFillPathCHROMIUM(path, GL_COUNT_UP_CHROMIUM, 0x7F,
                                       GL_BOUNDING_BOX_CHROMIUM);
    EXPECT_EQ(expected_error, glGetError());
  }

  GLManager gl_;
  GLint color_loc_;
};

TEST_F(CHROMIUMPathRenderingTest, TestMatrix) {
  if (!GLTestHelper::HasExtension("GL_CHROMIUM_path_rendering"))
    return;

  static const GLfloat kIdentityMatrix[16] = {
      1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
      0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f};
  static const GLfloat kSeqMatrix[16] = {
      0.5f, -0.5f, -0.1f,  -0.8f,  4.4f,   5.5f,   6.6f,   7.7f,
      8.8f, 9.9f,  10.11f, 11.22f, 12.33f, 13.44f, 14.55f, 15.66f};
  static const GLenum kMatrixModes[] = {GL_PATH_MODELVIEW_CHROMIUM,
                                        GL_PATH_PROJECTION_CHROMIUM};
  static const GLenum kGetMatrixModes[] = {GL_PATH_MODELVIEW_MATRIX_CHROMIUM,
                                           GL_PATH_PROJECTION_MATRIX_CHROMIUM};

  for (size_t i = 0; i < arraysize(kMatrixModes); ++i) {
    GLfloat mf[16];
    GLint mi[16];
    memset(mf, 0, sizeof(mf));
    memset(mi, 0, sizeof(mi));
    glGetFloatv(kGetMatrixModes[i], mf);
    glGetIntegerv(kGetMatrixModes[i], mi);
    ExpectEqualMatrix(kIdentityMatrix, mf);
    ExpectEqualMatrix(kIdentityMatrix, mi);

    glMatrixLoadfCHROMIUM(kMatrixModes[i], kSeqMatrix);
    memset(mf, 0, sizeof(mf));
    memset(mi, 0, sizeof(mi));
    glGetFloatv(kGetMatrixModes[i], mf);
    glGetIntegerv(kGetMatrixModes[i], mi);
    ExpectEqualMatrix(kSeqMatrix, mf);
    ExpectEqualMatrix(kSeqMatrix, mi);

    glMatrixLoadIdentityCHROMIUM(kMatrixModes[i]);
    memset(mf, 0, sizeof(mf));
    memset(mi, 0, sizeof(mi));
    glGetFloatv(kGetMatrixModes[i], mf);
    glGetIntegerv(kGetMatrixModes[i], mi);
    ExpectEqualMatrix(kIdentityMatrix, mf);
    ExpectEqualMatrix(kIdentityMatrix, mi);

    EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
  }
}

TEST_F(CHROMIUMPathRenderingTest, TestMatrixErrors) {
  if (!GLTestHelper::HasExtension("GL_CHROMIUM_path_rendering"))
    return;

  GLfloat mf[16];
  memset(mf, 0, sizeof(mf));

  glMatrixLoadfCHROMIUM(GL_PATH_MODELVIEW_CHROMIUM, mf);
  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

  glMatrixLoadIdentityCHROMIUM(GL_PATH_PROJECTION_CHROMIUM);
  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

  // Test that invalid matrix targets fail.
  glMatrixLoadfCHROMIUM(GL_PATH_MODELVIEW_CHROMIUM - 1, mf);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_ENUM), glGetError());

  // Test that invalid matrix targets fail.
  glMatrixLoadIdentityCHROMIUM(GL_PATH_PROJECTION_CHROMIUM + 1);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_ENUM), glGetError());
}

TEST_F(CHROMIUMPathRenderingTest, TestSimpleCalls) {
  if (!GLTestHelper::HasExtension("GL_CHROMIUM_path_rendering"))
    return;

  // This is unspecified in NV_path_rendering.
  EXPECT_EQ(0u, glGenPathsCHROMIUM(0));

  GLuint path = glGenPathsCHROMIUM(1);
  EXPECT_NE(path, 0u);
  glDeletePathsCHROMIUM(path, 1);
  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

  GLuint first_path = glGenPathsCHROMIUM(5);
  EXPECT_NE(first_path, 0u);
  glDeletePathsCHROMIUM(first_path, 5);
  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

  // Test deleting paths that are not actually allocated:
  // "unused names in /paths/ are silently ignored".
  first_path = glGenPathsCHROMIUM(5);
  EXPECT_NE(first_path, 0u);
  glDeletePathsCHROMIUM(first_path, 6);
  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

  GLsizei big_range = 0xffff;
  // Setting big_range = std::numeric_limits<GLsizei>::max() should go through
  // too, as far as NV_path_rendering is concerned. Current chromium side id
  // allocator will use too much memory.
  first_path = glGenPathsCHROMIUM(big_range);
  EXPECT_NE(first_path, 0u);
  glDeletePathsCHROMIUM(first_path, big_range);
  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

  // Test glIsPathCHROMIUM().
  path = glGenPathsCHROMIUM(1);
  EXPECT_FALSE(glIsPathCHROMIUM(path));
  GLubyte commands[] = {GL_MOVE_TO_CHROMIUM, GL_CLOSE_PATH_CHROMIUM};
  GLfloat coords[] = {50.0f, 50.0f};
  glPathCommandsCHROMIUM(path, arraysize(commands), commands, arraysize(coords),
                         GL_FLOAT, coords);
  EXPECT_TRUE(glIsPathCHROMIUM(path));
  glDeletePathsCHROMIUM(path, 1);
  EXPECT_FALSE(glIsPathCHROMIUM(path));
}

TEST_F(CHROMIUMPathRenderingTest, TestGenDeleteErrors) {
  if (!GLTestHelper::HasExtension("GL_CHROMIUM_path_rendering"))
    return;

  // GenPaths / DeletePaths tests.
  // std::numeric_limits<GLuint>::max() is wrong for GLsizei.
  GLuint first_path = glGenPathsCHROMIUM(std::numeric_limits<GLuint>::max());
  EXPECT_EQ(first_path, 0u);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_VALUE), glGetError());

  first_path = glGenPathsCHROMIUM(-1);
  EXPECT_EQ(first_path, 0u);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_VALUE), glGetError());

  glDeletePathsCHROMIUM(1, -5);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_VALUE), glGetError());

  first_path = glGenPathsCHROMIUM(-1);
  EXPECT_EQ(first_path, 0u);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_VALUE), glGetError());

  // Test that delete with first_id and range such that first_id + range
  // overflows the GLuint. Example:
  // Range is 0x7fffffff. First id is X. Last id will be X + 0x7ffffffe.
  // X = 0x80000001 would succeed, where as X = 0x80000002 would fail.
  // To get 0x80000002, we need to allocate first 0x7fffffff and then
  // 3 (0x80000000, 0x80000001 and 0x80000002).
  // While not guaranteed by the API, we expect the implementation
  // hands us deterministic ids.
  first_path = glGenPathsCHROMIUM(std::numeric_limits<GLsizei>::max());
  EXPECT_EQ(first_path, 1u);
  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

  GLuint additional_paths = glGenPathsCHROMIUM(3);
  EXPECT_EQ(additional_paths,
            static_cast<GLuint>(std::numeric_limits<GLsizei>::max()) + 1u);
  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

  // Test that passing a range so big that it would overflow client_id
  // + range - 1 check causes an error.
  glDeletePathsCHROMIUM(additional_paths + 2u,
                        std::numeric_limits<GLsizei>::max());
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_OPERATION), glGetError());

  // Cleanup the above allocations. Also test that passing max value still
  // works.
  glDeletePathsCHROMIUM(1, std::numeric_limits<GLsizei>::max());
  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
  glDeletePathsCHROMIUM(std::numeric_limits<GLsizei>::max(),
                        std::numeric_limits<GLsizei>::max());
  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
}

TEST_F(CHROMIUMPathRenderingTest, TestPathParameterErrors) {
  if (!GLTestHelper::HasExtension("GL_CHROMIUM_path_rendering"))
    return;

  GLuint path = glGenPathsCHROMIUM(1);
  // PathParameter*: Wrong value for the pname should fail.
  glPathParameteriCHROMIUM(path, GL_PATH_JOIN_STYLE_CHROMIUM, GL_FLAT_CHROMIUM);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_VALUE), glGetError());
  glPathParameterfCHROMIUM(path, GL_PATH_END_CAPS_CHROMIUM,
                           GL_MITER_REVERT_CHROMIUM);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_VALUE), glGetError());

  // PathParameter*: Wrong floating-point value should fail.
  glPathParameterfCHROMIUM(path, GL_PATH_STROKE_WIDTH_CHROMIUM, -0.1f);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_VALUE), glGetError());
  glPathParameterfCHROMIUM(path, GL_PATH_MITER_LIMIT_CHROMIUM,
                           std::numeric_limits<float>::quiet_NaN());
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_VALUE), glGetError());
  glPathParameterfCHROMIUM(path, GL_PATH_MITER_LIMIT_CHROMIUM,
                           std::numeric_limits<float>::infinity());
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_VALUE), glGetError());

  // PathParameter*: Wrong pname should fail.
  glPathParameteriCHROMIUM(path, GL_PATH_STROKE_WIDTH_CHROMIUM - 1, 5);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_ENUM), glGetError());
  glDeletePathsCHROMIUM(path, 1);
}

TEST_F(CHROMIUMPathRenderingTest, TestPathObjectState) {
  if (!GLTestHelper::HasExtension("GL_CHROMIUM_path_rendering"))
    return;

  glViewport(0, 0, kResolution, kResolution);
  glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
  glStencilMask(0xffffffff);
  glClearStencil(0);
  glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  glPathStencilFuncCHROMIUM(GL_ALWAYS, 0, 0xFF);
  glStencilOp(GL_KEEP, GL_KEEP, GL_ZERO);

  // Test that trying to draw non-existing paths does not produce errors or
  // results.
  GLuint non_existing_paths[] = {0, 55, 74744};
  for (auto& p : non_existing_paths) {
    EXPECT_FALSE(glIsPathCHROMIUM(p));
    EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
    TryAllDrawFunctions(p, GL_NO_ERROR);
  }

  // Path name marked as used but without path object state causes
  // a GL error upon any draw command.
  GLuint path = glGenPathsCHROMIUM(1);
  EXPECT_FALSE(glIsPathCHROMIUM(path));
  TryAllDrawFunctions(path, GL_INVALID_OPERATION);
  glDeletePathsCHROMIUM(path, 1);

  // Document a bit of an inconsistency: path name marked as used but without
  // path object state causes a GL error upon any draw command (tested above).
  // Path name that had path object state, but then was "cleared", still has a
  // path object state, even though the state is empty.
  path = glGenPathsCHROMIUM(1);
  EXPECT_FALSE(glIsPathCHROMIUM(path));
  GLubyte commands[] = {GL_MOVE_TO_CHROMIUM, GL_CLOSE_PATH_CHROMIUM};
  GLfloat coords[] = {50.0f, 50.0f};
  glPathCommandsCHROMIUM(path, arraysize(commands), commands, arraysize(coords),
                         GL_FLOAT, coords);
  EXPECT_TRUE(glIsPathCHROMIUM(path));
  glPathCommandsCHROMIUM(path, 0, NULL, 0, GL_FLOAT, NULL);
  EXPECT_TRUE(glIsPathCHROMIUM(path));  // The surprise.
  TryAllDrawFunctions(path, GL_NO_ERROR);
  glDeletePathsCHROMIUM(path, 1);

  // Document a bit of an inconsistency: "clearing" a used path name causes
  // path to acquire state.
  path = glGenPathsCHROMIUM(1);
  EXPECT_FALSE(glIsPathCHROMIUM(path));
  glPathCommandsCHROMIUM(path, 0, NULL, 0, GL_FLOAT, NULL);
  EXPECT_TRUE(glIsPathCHROMIUM(path));  // The surprise.
  glDeletePathsCHROMIUM(path, 1);

  // Make sure nothing got drawn by the drawing commands that should not produce
  // anything.
  const uint8 black[] = {0, 0, 0, 0};
  EXPECT_TRUE(
      GLTestHelper::CheckPixels(0, 0, kResolution, kResolution, 0, black));
}

TEST_F(CHROMIUMPathRenderingTest, TestUnnamedPathsErrors) {
  if (!GLTestHelper::HasExtension("GL_CHROMIUM_path_rendering"))
    return;

  // Unnamed paths: Trying to create a path object with non-existing path name
  // produces error.  (Not a error in real NV_path_rendering).
  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
  GLubyte commands[] = {GL_MOVE_TO_CHROMIUM, GL_CLOSE_PATH_CHROMIUM};
  GLfloat coords[] = {50.0f, 50.0f};
  glPathCommandsCHROMIUM(555, arraysize(commands), commands, arraysize(coords),
                         GL_FLOAT, coords);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_OPERATION), glGetError());

  // PathParameter*: Using non-existing path object produces error.
  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
  glPathParameterfCHROMIUM(555, GL_PATH_STROKE_WIDTH_CHROMIUM, 5.0f);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_OPERATION), glGetError());

  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
  glPathParameteriCHROMIUM(555, GL_PATH_JOIN_STYLE_CHROMIUM, GL_ROUND_CHROMIUM);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_OPERATION), glGetError());
}

TEST_F(CHROMIUMPathRenderingTest, TestPathCommandsErrors) {
  if (!GLTestHelper::HasExtension("GL_CHROMIUM_path_rendering"))
    return;

  static const GLenum kInvalidCoordType = GL_NONE;

  GLuint path = glGenPathsCHROMIUM(1);
  GLubyte commands[] = {GL_MOVE_TO_CHROMIUM, GL_CLOSE_PATH_CHROMIUM};
  GLfloat coords[] = {50.0f, 50.0f};

  glPathCommandsCHROMIUM(path, arraysize(commands), commands, -4, GL_FLOAT,
                         coords);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_VALUE), glGetError());

  glPathCommandsCHROMIUM(path, -1, commands, arraysize(coords), GL_FLOAT,
                         coords);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_VALUE), glGetError());

  glPathCommandsCHROMIUM(path, arraysize(commands), commands, arraysize(coords),
                         kInvalidCoordType, coords);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_ENUM), glGetError());

  // These can not distinquish between the check that should fail them.
  // This should fail due to coord count * float size overflow.
  glPathCommandsCHROMIUM(path, arraysize(commands), commands,
                         std::numeric_limits<GLsizei>::max(), GL_FLOAT, coords);
  // This should fail due to cmd count + coord count * short size.
  glPathCommandsCHROMIUM(path, arraysize(commands), commands,
                         std::numeric_limits<GLsizei>::max(), GL_SHORT, coords);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_OPERATION), glGetError());

  glDeletePathsCHROMIUM(path, 1);
}

TEST_F(CHROMIUMPathRenderingTest, TestPathRenderingInvalidArgs) {
  if (!GLTestHelper::HasExtension("GL_CHROMIUM_path_rendering"))
    return;

  GLuint path = glGenPathsCHROMIUM(1);
  glPathCommandsCHROMIUM(path, 0, NULL, 0, GL_FLOAT, NULL);

  // Verify that normal calls work.
  glStencilFillPathCHROMIUM(path, GL_COUNT_UP_CHROMIUM, 0x7F);
  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
  glStencilThenCoverFillPathCHROMIUM(path, GL_COUNT_UP_CHROMIUM, 0x7F,
                                     GL_BOUNDING_BOX_CHROMIUM);
  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

  // Using invalid fill mode causes INVALID_ENUM.
  glStencilFillPathCHROMIUM(path, GL_COUNT_UP_CHROMIUM - 1, 0x7F);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_ENUM), glGetError());
  glStencilThenCoverFillPathCHROMIUM(path, GL_COUNT_UP_CHROMIUM - 1, 0x7F,
                                     GL_BOUNDING_BOX_CHROMIUM);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_ENUM), glGetError());

  // Using invalid cover mode causes INVALID_ENUM.
  glCoverFillPathCHROMIUM(path, GL_CONVEX_HULL_CHROMIUM - 1);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_ENUM), glGetError());
  glStencilThenCoverFillPathCHROMIUM(path, GL_COUNT_UP_CHROMIUM, 0x7F,
                                     GL_BOUNDING_BOX_CHROMIUM + 1);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_ENUM), glGetError());

  // Using mask+1 not being power of two causes INVALID_VALUE with up/down fill
  // mode.
  glStencilFillPathCHROMIUM(path, GL_COUNT_UP_CHROMIUM, 0x40);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_VALUE), glGetError());
  glStencilThenCoverFillPathCHROMIUM(path, GL_COUNT_DOWN_CHROMIUM, 12,
                                     GL_BOUNDING_BOX_CHROMIUM);
  EXPECT_EQ(static_cast<GLenum>(GL_INVALID_VALUE), glGetError());

  glDeletePathsCHROMIUM(path, 1);
}

// Tests that drawing with CHROMIUM_path_rendering functions work.
TEST_F(CHROMIUMPathRenderingTest, TestPathRendering) {
  if (!GLTestHelper::HasExtension("GL_CHROMIUM_path_rendering"))
    return;

  static const float kBlue[] = {0.0f, 0.0f, 1.0f, 1.0f};
  static const float kGreen[] = {0.0f, 1.0f, 0.0f, 1.0f};

  SetupStateForTestPattern();

  GLuint path = glGenPathsCHROMIUM(1);
  SetupPathStateForTestPattern(path);

  // Do the stencil fill, cover fill, stencil stroke, cover stroke
  // in unconventional order:
  // 1) stencil the stroke in stencil high bit
  // 2) stencil the fill in low bits
  // 3) cover the fill
  // 4) cover the stroke
  // This is done to check that glPathStencilFunc works, eg the mask
  // goes through. Stencil func is not tested ATM, for simplicity.

  glPathStencilFuncCHROMIUM(GL_ALWAYS, 0, 0xFF);
  glStencilStrokePathCHROMIUM(path, 0x80, 0x80);

  glPathStencilFuncCHROMIUM(GL_ALWAYS, 0, 0x7F);
  glStencilFillPathCHROMIUM(path, GL_COUNT_UP_CHROMIUM, 0x7F);

  glStencilFunc(GL_LESS, 0, 0x7F);
  glStencilOp(GL_KEEP, GL_KEEP, GL_ZERO);
  glUniform4fv(color_loc_, 1, kBlue);
  glCoverFillPathCHROMIUM(path, GL_BOUNDING_BOX_CHROMIUM);

  glStencilFunc(GL_EQUAL, 0x80, 0x80);
  glStencilOp(GL_KEEP, GL_KEEP, GL_ZERO);
  glUniform4fv(color_loc_, 1, kGreen);
  glCoverStrokePathCHROMIUM(path, GL_CONVEX_HULL_CHROMIUM);

  glDeletePathsCHROMIUM(path, 1);

  // Verify the image.
  VerifyTestPatternFill(0.0f, 0.0f);
  VerifyTestPatternBg(0.0f, 0.0f);
  VerifyTestPatternStroke(0.0f, 0.0f);
}

// Tests that drawing with CHROMIUM_path_rendering
// StencilThenCover{Stroke,Fill}Path functions work.
TEST_F(CHROMIUMPathRenderingTest, TestPathRenderingThenFunctions) {
  if (!GLTestHelper::HasExtension("GL_CHROMIUM_path_rendering"))
    return;

  static float kBlue[] = {0.0f, 0.0f, 1.0f, 1.0f};
  static float kGreen[] = {0.0f, 1.0f, 0.0f, 1.0f};

  SetupStateForTestPattern();

  GLuint path = glGenPathsCHROMIUM(1);
  SetupPathStateForTestPattern(path);

  glPathStencilFuncCHROMIUM(GL_ALWAYS, 0, 0xFF);
  glStencilFunc(GL_EQUAL, 0x80, 0x80);
  glStencilOp(GL_KEEP, GL_KEEP, GL_ZERO);
  glUniform4fv(color_loc_, 1, kGreen);
  glStencilThenCoverStrokePathCHROMIUM(path, 0x80, 0x80,
                                       GL_BOUNDING_BOX_CHROMIUM);

  glPathStencilFuncCHROMIUM(GL_ALWAYS, 0, 0x7F);
  glStencilFunc(GL_LESS, 0, 0x7F);
  glStencilOp(GL_KEEP, GL_KEEP, GL_ZERO);
  glUniform4fv(color_loc_, 1, kBlue);
  glStencilThenCoverFillPathCHROMIUM(path, GL_COUNT_UP_CHROMIUM, 0x7F,
                                     GL_CONVEX_HULL_CHROMIUM);

  glDeletePathsCHROMIUM(path, 1);

  // Verify the image.
  VerifyTestPatternFill(0.0f, 0.0f);
  VerifyTestPatternBg(0.0f, 0.0f);
  VerifyTestPatternStroke(0.0f, 0.0f);
}

}  // namespace gpu