//
// Copyright 2015 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// RendererTest:
//   These tests are designed to ensure that the various configurations of the test fixtures work as
//   expected. If one of these tests fails, then it is likely that some of the other tests are being
//   configured incorrectly. For example, they might be using the D3D11 renderer when the test is
//   meant to be using the D3D9 renderer.

#include "test_utils/ANGLETest.h"

#include "common/string_utils.h"

using namespace angle;

namespace
{

class RendererTest : public ANGLETest<>
{
  protected:
    RendererTest()
    {
        setWindowWidth(128);
        setWindowHeight(128);
    }
};

// Print vendor, renderer, version and extension strings. Useful for debugging.
TEST_P(RendererTest, Strings)
{
    std::cout << "Renderer: " << glGetString(GL_RENDERER) << std::endl;
    std::cout << "Vendor: " << glGetString(GL_VENDOR) << std::endl;
    std::cout << "Version: " << glGetString(GL_VERSION) << std::endl;
    std::cout << "Extensions: " << glGetString(GL_EXTENSIONS) << std::endl;
    EXPECT_GL_NO_ERROR();
}

TEST_P(RendererTest, RequestedRendererCreated)
{
    std::string rendererString =
        std::string(reinterpret_cast<const char *>(glGetString(GL_RENDERER)));
    angle::ToLower(&rendererString);

    std::string versionString =
        std::string(reinterpret_cast<const char *>(glGetString(GL_VERSION)));
    angle::ToLower(&versionString);

    const EGLPlatformParameters &platform = GetParam().eglParameters;

    // Ensure that the renderer string contains D3D11, if we requested a D3D11 renderer.
    if (platform.renderer == EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE)
    {
        ASSERT_NE(rendererString.find(std::string("direct3d11")), std::string::npos);
    }

    // Ensure that the renderer string contains D3D9, if we requested a D3D9 renderer.
    if (platform.renderer == EGL_PLATFORM_ANGLE_TYPE_D3D9_ANGLE)
    {
        ASSERT_NE(rendererString.find(std::string("direct3d9")), std::string::npos);
    }

    // Ensure that the major and minor versions trigger expected behavior in D3D11
    if (platform.renderer == EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE)
    {
        // Ensure that the renderer uses WARP, if we requested it.
        if (platform.deviceType == EGL_PLATFORM_ANGLE_DEVICE_TYPE_D3D_WARP_ANGLE)
        {
            auto basicRenderPos     = rendererString.find(std::string("microsoft basic render"));
            auto softwareAdapterPos = rendererString.find(std::string("software adapter"));
            ASSERT_TRUE(basicRenderPos != std::string::npos ||
                        softwareAdapterPos != std::string::npos);
        }

        std::vector<std::string> acceptableShaderModels;

        // When no specific major/minor version is requested, then ANGLE should return the highest
        // possible feature level by default. The current hardware driver might not support Feature
        // Level 11_0, but WARP always does. Therefore if WARP is specified but no major/minor
        // version is specified, then we test to check that ANGLE returns FL11_0.
        if (platform.majorVersion >= 11 || platform.majorVersion == EGL_DONT_CARE)
        {
            // Feature Level 10_0 corresponds to shader model 5_0
            acceptableShaderModels.push_back("ps_5_0");
        }

        if (platform.majorVersion >= 10 || platform.majorVersion == EGL_DONT_CARE)
        {
            if (platform.minorVersion >= 1 || platform.minorVersion == EGL_DONT_CARE)
            {
                // Feature Level 10_1 corresponds to shader model 4_1
                acceptableShaderModels.push_back("ps_4_1");
            }

            if (platform.minorVersion >= 0 || platform.minorVersion == EGL_DONT_CARE)
            {
                // Feature Level 10_0 corresponds to shader model 4_0
                acceptableShaderModels.push_back("ps_4_0");
            }
        }

        if (platform.majorVersion == 9 && platform.minorVersion == 3)
        {
            acceptableShaderModels.push_back("ps_4_0_level_9_3");
        }

        bool found = false;
        for (size_t i = 0; i < acceptableShaderModels.size(); i++)
        {
            if (rendererString.find(acceptableShaderModels[i]) != std::string::npos)
            {
                found = true;
            }
        }

        ASSERT_TRUE(found);
    }

    if (platform.renderer == EGL_PLATFORM_ANGLE_TYPE_NULL_ANGLE)
    {
        ASSERT_TRUE(IsNULL());
    }

    if (platform.renderer == EGL_PLATFORM_ANGLE_TYPE_VULKAN_ANGLE)
    {
        ASSERT_TRUE(IsVulkan());
    }

    EGLint glesMajorVersion = GetParam().majorVersion;
    EGLint glesMinorVersion = GetParam().minorVersion;

    std::ostringstream expectedVersionString;
    if (GetParam().clientType == EGL_OPENGL_ES_API)
    {
        expectedVersionString << "es ";
    }
    expectedVersionString << glesMajorVersion << "." << glesMinorVersion;

    ASSERT_NE(versionString.find(expectedVersionString.str()), std::string::npos);

    ASSERT_GL_NO_ERROR();
    ASSERT_EGL_SUCCESS();
}

// Perform a simple operation (clear and read pixels) to verify the device is working
TEST_P(RendererTest, SimpleOperation)
{
    if (IsNULL())
    {
        std::cout << "ANGLE NULL backend clears are not functional" << std::endl;
        return;
    }

    glClearColor(0.0f, 1.0f, 0.0f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT);
    EXPECT_PIXEL_EQ(0, 0, 0, 255, 0, 255);

    ASSERT_GL_NO_ERROR();
}

// Select configurations (e.g. which renderer, which GLES major version) these tests should be run
// against.

ANGLE_INSTANTIATE_TEST_ES2_AND_ES3_AND_ES31_AND_NULL_AND(RendererTest,
                                                         ANGLE_ALL_TEST_PLATFORMS_GL32_CORE);
}  // anonymous namespace