//
// 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.
//

#include "test_utils/ANGLETest.h"
#include "test_utils/gl_raii.h"

namespace angle
{

class CopyTexImageTest : public ANGLETest
{
  protected:
    CopyTexImageTest()
    {
        setWindowWidth(32);
        setWindowHeight(32);
        setConfigRedBits(8);
        setConfigGreenBits(8);
        setConfigBlueBits(8);
        setConfigAlphaBits(8);
    }

    void testSetUp() override
    {
        constexpr char kVS[] =
            "precision highp float;\n"
            "attribute vec4 position;\n"
            "varying vec2 texcoord;\n"
            "\n"
            "void main()\n"
            "{\n"
            "    gl_Position = position;\n"
            "    texcoord = (position.xy * 0.5) + 0.5;\n"
            "}\n";

        constexpr char kFS[] =
            "precision highp float;\n"
            "uniform sampler2D tex;\n"
            "varying vec2 texcoord;\n"
            "\n"
            "void main()\n"
            "{\n"
            "    gl_FragColor = texture2D(tex, texcoord);\n"
            "}\n";

        mTextureProgram = CompileProgram(kVS, kFS);
        if (mTextureProgram == 0)
        {
            FAIL() << "shader compilation failed.";
        }

        mTextureUniformLocation = glGetUniformLocation(mTextureProgram, "tex");

        ASSERT_GL_NO_ERROR();
    }

    void testTearDown() override { glDeleteProgram(mTextureProgram); }

    void initializeResources(GLenum format, GLenum type)
    {
        for (size_t i = 0; i < kFboCount; ++i)
        {
            glBindTexture(GL_TEXTURE_2D, mFboTextures[i]);
            glTexImage2D(GL_TEXTURE_2D, 0, format, kFboSizes[i], kFboSizes[i], 0, format, type,
                         nullptr);

            // Disable mipmapping
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

            glBindFramebuffer(GL_FRAMEBUFFER, mFbos[i]);
            glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
                                   mFboTextures[i], 0);

            glClearColor(kFboColors[i][0], kFboColors[i][1], kFboColors[i][2], kFboColors[i][3]);
            glClear(GL_COLOR_BUFFER_BIT);
        }

        ASSERT_GL_NO_ERROR();
    }

    void verifyResults(GLuint texture,
                       GLubyte data[4],
                       GLint fboSize,
                       GLint xs,
                       GLint ys,
                       GLint xe,
                       GLint ye)
    {
        glViewport(0, 0, fboSize, fboSize);

        glBindFramebuffer(GL_FRAMEBUFFER, 0);

        // Draw a quad with the target texture
        glUseProgram(mTextureProgram);
        glBindTexture(GL_TEXTURE_2D, texture);
        glUniform1i(mTextureUniformLocation, 0);

        drawQuad(mTextureProgram, "position", 0.5f);

        // Expect that the rendered quad has the same color as the source texture
        EXPECT_PIXEL_NEAR(xs, ys, data[0], data[1], data[2], data[3], 1.0);
        EXPECT_PIXEL_NEAR(xs, ye - 1, data[0], data[1], data[2], data[3], 1.0);
        EXPECT_PIXEL_NEAR(xe - 1, ys, data[0], data[1], data[2], data[3], 1.0);
        EXPECT_PIXEL_NEAR(xe - 1, ye - 1, data[0], data[1], data[2], data[3], 1.0);
        EXPECT_PIXEL_NEAR((xs + xe) / 2, (ys + ye) / 2, data[0], data[1], data[2], data[3], 1.0);
    }

    void runCopyTexImageTest(GLenum format, GLubyte expected[3][4])
    {
        GLTexture tex;
        glBindTexture(GL_TEXTURE_2D, tex);

        // Disable mipmapping
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

        // Perform the copy multiple times.
        //
        // - The first time, a new texture is created
        // - The second time, as the fbo size is the same as previous, the texture storage is not
        //   recreated.
        // - The third time, the fbo size is different, so a new texture is created.
        for (size_t i = 0; i < kFboCount; ++i)
        {
            glBindFramebuffer(GL_FRAMEBUFFER, mFbos[i]);

            glCopyTexImage2D(GL_TEXTURE_2D, 0, format, 0, 0, kFboSizes[i], kFboSizes[i], 0);
            ASSERT_GL_NO_ERROR();

            verifyResults(tex, expected[i], kFboSizes[i], 0, 0, kFboSizes[i], kFboSizes[i]);
        }
    }

    void runCopyTexSubImageTest(GLenum format, GLubyte expected[3][4])
    {
        GLTexture tex;
        glBindTexture(GL_TEXTURE_2D, tex);

        // Disable mipmapping
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

        // Create the texture with copy of the first fbo.
        glBindFramebuffer(GL_FRAMEBUFFER, mFbos[0]);
        glCopyTexImage2D(GL_TEXTURE_2D, 0, format, 0, 0, kFboSizes[0], kFboSizes[0], 0);
        ASSERT_GL_NO_ERROR();

        verifyResults(tex, expected[0], kFboSizes[0], 0, 0, kFboSizes[0], kFboSizes[0]);

        // Make sure out-of-bound writes to the texture return invalid value.
        glBindFramebuffer(GL_FRAMEBUFFER, mFbos[1]);

        // xoffset < 0 and yoffset < 0
        glCopyTexSubImage2D(GL_TEXTURE_2D, 0, -1, -1, 0, 0, kFboSizes[0], kFboSizes[0]);
        ASSERT_GL_ERROR(GL_INVALID_VALUE);

        // xoffset + width > w and yoffset + height > h
        glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 1, 1, 0, 0, kFboSizes[0], kFboSizes[0]);
        ASSERT_GL_ERROR(GL_INVALID_VALUE);

        // xoffset + width > w and yoffset + height > h, out of bounds
        glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, -1, -1, 1 + kFboSizes[0], 1 + kFboSizes[0]);
        ASSERT_GL_ERROR(GL_INVALID_VALUE);

        // Copy the second fbo over a portion of the image.
        GLint offset = kFboSizes[0] / 2;
        GLint extent = kFboSizes[0] - offset;

        glCopyTexSubImage2D(GL_TEXTURE_2D, 0, offset, offset, kFboSizes[1] / 2, kFboSizes[1] / 2,
                            extent, extent);
        ASSERT_GL_NO_ERROR();

        verifyResults(tex, expected[1], kFboSizes[0], offset, offset, kFboSizes[0], kFboSizes[0]);

        // The rest of the image should be untouched
        verifyResults(tex, expected[0], kFboSizes[0], 0, 0, offset, offset);
        verifyResults(tex, expected[0], kFboSizes[0], offset, 0, kFboSizes[0], offset);
        verifyResults(tex, expected[0], kFboSizes[0], 0, offset, offset, kFboSizes[0]);

        // Copy the third fbo over another portion of the image.
        glBindFramebuffer(GL_FRAMEBUFFER, mFbos[2]);

        offset = kFboSizes[0] / 4;
        extent = kFboSizes[0] - offset;

        // While width and height are set as 3/4 of the size, the fbo offset is given such that
        // after clipping, width and height are effectively 1/2 of the size.
        GLint srcOffset       = kFboSizes[2] - kFboSizes[0] / 2;
        GLint effectiveExtent = kFboSizes[0] / 2;

        glCopyTexSubImage2D(GL_TEXTURE_2D, 0, offset, offset, srcOffset, srcOffset, extent, extent);
        ASSERT_GL_NO_ERROR();

        verifyResults(tex, expected[2], kFboSizes[0], offset, offset, effectiveExtent,
                      effectiveExtent);

        // The rest of the image should be untouched
        verifyResults(tex, expected[1], kFboSizes[0], offset + effectiveExtent, kFboSizes[0] / 2,
                      kFboSizes[0], kFboSizes[0]);
        verifyResults(tex, expected[1], kFboSizes[0], kFboSizes[0] / 2, offset + effectiveExtent,
                      kFboSizes[0], kFboSizes[0]);

        verifyResults(tex, expected[0], kFboSizes[0], 0, 0, kFboSizes[0], offset);
        verifyResults(tex, expected[0], kFboSizes[0], 0, 0, offset, kFboSizes[0]);
        verifyResults(tex, expected[0], kFboSizes[0], offset + effectiveExtent, 0, kFboSizes[0],
                      kFboSizes[0] / 2);
        verifyResults(tex, expected[0], kFboSizes[0], 0, offset + effectiveExtent, kFboSizes[0] / 2,
                      kFboSizes[0]);
    }

    GLuint mTextureProgram;
    GLint mTextureUniformLocation;

    static constexpr uint32_t kFboCount = 3;
    GLFramebuffer mFbos[kFboCount];
    GLTexture mFboTextures[kFboCount];

    static constexpr uint32_t kFboSizes[kFboCount]    = {16, 16, 32};
    static constexpr GLfloat kFboColors[kFboCount][4] = {{0.25f, 1.0f, 0.75f, 0.5f},
                                                         {1.0f, 0.75f, 0.5f, 0.25f},
                                                         {0.5f, 0.25f, 1.0f, 0.75f}};
};

// Until C++17, need to redundantly declare the constexpr members outside the class (only the
// arrays, because the others are already const-propagated and not needed by the linker).
constexpr uint32_t CopyTexImageTest::kFboSizes[];
constexpr GLfloat CopyTexImageTest::kFboColors[][4];

TEST_P(CopyTexImageTest, RGBAToRGB)
{
    GLubyte expected[3][4] = {
        {64, 255, 191, 255},
        {255, 191, 127, 255},
        {127, 64, 255, 255},
    };

    initializeResources(GL_RGBA, GL_UNSIGNED_BYTE);
    runCopyTexImageTest(GL_RGB, expected);
}

TEST_P(CopyTexImageTest, RGBAToL)
{
    GLubyte expected[3][4] = {
        {64, 64, 64, 255},
        {255, 255, 255, 255},
        {127, 127, 127, 255},
    };

    initializeResources(GL_RGBA, GL_UNSIGNED_BYTE);
    runCopyTexImageTest(GL_LUMINANCE, expected);
}

TEST_P(CopyTexImageTest, RGBToL)
{
    GLubyte expected[3][4] = {
        {64, 64, 64, 255},
        {255, 255, 255, 255},
        {127, 127, 127, 255},
    };

    initializeResources(GL_RGB, GL_UNSIGNED_BYTE);
    runCopyTexImageTest(GL_LUMINANCE, expected);
}

TEST_P(CopyTexImageTest, RGBAToLA)
{
    GLubyte expected[3][4] = {
        {64, 64, 64, 127},
        {255, 255, 255, 64},
        {127, 127, 127, 191},
    };

    initializeResources(GL_RGBA, GL_UNSIGNED_BYTE);
    runCopyTexImageTest(GL_LUMINANCE_ALPHA, expected);
}

TEST_P(CopyTexImageTest, RGBAToA)
{
    GLubyte expected[3][4] = {
        {0, 0, 0, 127},
        {0, 0, 0, 64},
        {0, 0, 0, 191},
    };

    initializeResources(GL_RGBA, GL_UNSIGNED_BYTE);
    runCopyTexImageTest(GL_ALPHA, expected);
}

TEST_P(CopyTexImageTest, SubImageRGBAToRGB)
{
    GLubyte expected[3][4] = {
        {64, 255, 191, 255},
        {255, 191, 127, 255},
        {127, 64, 255, 255},
    };

    initializeResources(GL_RGBA, GL_UNSIGNED_BYTE);
    runCopyTexSubImageTest(GL_RGB, expected);
}

TEST_P(CopyTexImageTest, SubImageRGBAToL)
{
    GLubyte expected[3][4] = {
        {64, 64, 64, 255},
        {255, 255, 255, 255},
        {127, 127, 127, 255},
    };

    initializeResources(GL_RGBA, GL_UNSIGNED_BYTE);
    runCopyTexSubImageTest(GL_LUMINANCE, expected);
}

TEST_P(CopyTexImageTest, SubImageRGBAToLA)
{
    GLubyte expected[3][4] = {
        {64, 64, 64, 127},
        {255, 255, 255, 64},
        {127, 127, 127, 191},
    };

    initializeResources(GL_RGBA, GL_UNSIGNED_BYTE);
    runCopyTexSubImageTest(GL_LUMINANCE_ALPHA, expected);
}

TEST_P(CopyTexImageTest, SubImageRGBToL)
{
    GLubyte expected[3][4] = {
        {64, 64, 64, 255},
        {255, 255, 255, 255},
        {127, 127, 127, 255},
    };

    initializeResources(GL_RGB, GL_UNSIGNED_BYTE);
    runCopyTexSubImageTest(GL_LUMINANCE, expected);
}

// Read default framebuffer with glCopyTexImage2D().
TEST_P(CopyTexImageTest, DefaultFramebuffer)
{
    // Seems to be a bug in Mesa with the GLX back end: cannot read framebuffer until we draw to it.
    // glCopyTexImage2D() below will fail without this clear.
    glClear(GL_COLOR_BUFFER_BIT);

    const GLint w = getWindowWidth(), h = getWindowHeight();
    GLTexture tex;
    glBindTexture(GL_TEXTURE_2D, tex);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 0, 0, w, h, 0);
    EXPECT_GL_NO_ERROR();
}

// Read default framebuffer with glCopyTexSubImage2D().
TEST_P(CopyTexImageTest, SubDefaultFramebuffer)
{
    // Seems to be a bug in Mesa with the GLX back end: cannot read framebuffer until we draw to it.
    // glCopyTexSubImage2D() below will fail without this clear.
    glClear(GL_COLOR_BUFFER_BIT);

    const GLint w = getWindowWidth(), h = getWindowHeight();
    GLTexture tex;
    glBindTexture(GL_TEXTURE_2D, tex);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, w, h);
    EXPECT_GL_NO_ERROR();
}

// Calling CopyTexSubImage from cubeMap texture.
TEST_P(CopyTexImageTest, CopyTexSubImageFromCubeMap)
{
    constexpr GLsizei kCubeMapFaceCount = 6;

    // The framebuffer will be a face of a cube map with a different colors for each face.  Each
    // glCopyTexSubImage2D will take one face of this image to copy over a pixel in a 1x6
    // framebuffer.
    GLColor fboPixels[kCubeMapFaceCount]   = {GLColor::red,  GLColor::yellow, GLColor::green,
                                            GLColor::cyan, GLColor::blue,   GLColor::magenta};
    GLColor whitePixels[kCubeMapFaceCount] = {GLColor::white, GLColor::white, GLColor::white,
                                              GLColor::white, GLColor::white, GLColor::white};

    GLTexture fboTex;
    glBindTexture(GL_TEXTURE_CUBE_MAP, fboTex);
    for (GLenum face = GL_TEXTURE_CUBE_MAP_POSITIVE_X; face <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z;
         face++)
    {
        GLsizei faceIndex = face - GL_TEXTURE_CUBE_MAP_POSITIVE_X;

        glTexImage2D(face, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, &fboPixels[faceIndex]);
    }

    GLTexture dstTex;
    glBindTexture(GL_TEXTURE_2D, dstTex);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kCubeMapFaceCount, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 whitePixels);

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);

    for (GLenum face = GL_TEXTURE_CUBE_MAP_POSITIVE_X; face <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z;
         face++)
    {
        GLsizei faceIndex = face - GL_TEXTURE_CUBE_MAP_POSITIVE_X;

        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, face, fboTex, 0);

        ASSERT_GL_NO_ERROR();
        ASSERT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));

        // Copy the fbo (a cube map face) into a pixel of the destination texture.
        glCopyTexSubImage2D(GL_TEXTURE_2D, 0, faceIndex, 0, 0, 0, 1, 1);
    }

    // Make sure all the copies are done correctly.
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, dstTex, 0);

    ASSERT_GL_NO_ERROR();
    ASSERT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));

    for (GLsizei faceIndex = 0; faceIndex < kCubeMapFaceCount; ++faceIndex)
    {
        EXPECT_PIXEL_COLOR_EQ(faceIndex, 0, fboPixels[faceIndex]);
    }
}

// Calling CopyTexSubImage to a non-cube-complete texture.
TEST_P(CopyTexImageTest, CopyTexSubImageToNonCubeCompleteDestination)
{
    // TODO(hqle): Find what wrong with NVIDIA GPU. http://anglebug.com/4137
    ANGLE_SKIP_TEST_IF(IsNVIDIA() && IsMetal());

    constexpr GLsizei kCubeMapFaceCount = 6;

    // The framebuffer will be a 1x6 image with 6 different colors.  Each glCopyTexSubImage2D will
    // take one pixel of this image to copy over each face of a cube map.
    GLColor fboPixels[kCubeMapFaceCount] = {GLColor::red,  GLColor::yellow, GLColor::green,
                                            GLColor::cyan, GLColor::blue,   GLColor::magenta};
    GLColor whitePixel                   = GLColor::white;

    GLTexture fboTex;
    glBindTexture(GL_TEXTURE_2D, fboTex);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kCubeMapFaceCount, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 fboPixels);

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fboTex, 0);

    ASSERT_GL_NO_ERROR();
    ASSERT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));

    GLTexture cubeMap;
    glBindTexture(GL_TEXTURE_CUBE_MAP, cubeMap);

    for (GLenum face = GL_TEXTURE_CUBE_MAP_POSITIVE_X; face <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z;
         face++)
    {
        GLsizei faceIndex = face - GL_TEXTURE_CUBE_MAP_POSITIVE_X;

        // Initialize the face with a color not found in the fbo.
        glTexImage2D(face, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, &whitePixel);

        // Copy one pixel from the fbo into this face.  The first 5 copies are done on a
        // non-cube-complete texture.
        glCopyTexSubImage2D(face, 0, 0, 0, faceIndex, 0, 1, 1);
    }

    // Make sure all the copies are done correctly.
    for (GLenum face = GL_TEXTURE_CUBE_MAP_POSITIVE_X; face <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z;
         face++)
    {
        GLsizei faceIndex = face - GL_TEXTURE_CUBE_MAP_POSITIVE_X;

        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, face, cubeMap, 0);

        ASSERT_GL_NO_ERROR();
        ASSERT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));

        EXPECT_PIXEL_COLOR_EQ(0, 0, fboPixels[faceIndex]);
    }
}

// Deleting textures after copying to them. http://anglebug.com/4267
TEST_P(CopyTexImageTest, DeleteAfterCopyingToTextures)
{
    // Asserts on Vulkan backend. http://anglebug.com/4274
    ANGLE_SKIP_TEST_IF(IsVulkan());

    GLTexture texture;
    glBindTexture(GL_TEXTURE_2D, texture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

    GLTexture texture2;
    glBindTexture(GL_TEXTURE_2D, texture2);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

    GLFramebuffer framebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // Perform CopyTexImage2D
    glBindTexture(GL_TEXTURE_2D, texture);
    glCopyTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA, 0, 0, 2, 2, 0);
    ASSERT_GL_NO_ERROR();
    // Not necessary to do any CopyTexImage2D operations to texture2.

    // Perform CopyTexSubImage2D
    glBindTexture(GL_TEXTURE_2D, texture);
    glCopyTexSubImage2D(GL_TEXTURE_2D, 1, 0, 0, 0, 0, 1, 1);
    ASSERT_GL_NO_ERROR();
    glBindTexture(GL_TEXTURE_2D, texture2);
    glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, 1, 1);
    ASSERT_GL_NO_ERROR();

    // Clean up - provokes crash on buggy drivers.
    texture.reset();
    // Crashes on Intel GPUs on macOS.
    texture2.reset();
}

// specialization of CopyTexImageTest is added so that some tests can be explicitly run with an ES3
// context
class CopyTexImageTestES3 : public CopyTexImageTest
{
  protected:
    void initialize3DTexture(GLTexture &texture,
                             const GLsizei imageWidth,
                             const GLsizei imageHeight,
                             const GLsizei imageDepth,
                             const GLColor *textureData);
    void initialize2DTexture(GLTexture &texture,
                             const GLsizei imageWidth,
                             const GLsizei imageHeight,
                             const GLColor *textureData);
    void initialize2DTextureUShort4444(GLTexture &texture,
                                       const GLsizei imageWidth,
                                       const GLsizei imageHeight,
                                       const GLColor *textureData);
    void fillTexture(std::vector<GLColor> &texture, const GLColor color);
    void clearTexture(GLFramebuffer &fbo, GLTexture &texture, const GLColor color);
    void copyTexSubImage3D(GLTexture &subTexture2D,
                           const GLint xOffset,
                           const GLint yOffset,
                           const GLsizei subImageWidth,
                           const GLsizei subImageHeight,
                           const GLsizei imageDepth);
    void verifyCopyTexSubImage3D(GLTexture &texture3D,
                                 const GLint xOffset,
                                 const GLint yOffset,
                                 const GLColor subImageColor);

    // Constants
    const GLColor kSubImageColor = GLColor::yellow;
    // 3D image dimensions
    const GLsizei kImageWidth  = getWindowWidth();
    const GLsizei kImageHeight = getWindowHeight();
    const GLsizei kImageDepth  = 4;
    // 2D sub-image dimensions
    const GLsizei kSubImageWidth  = getWindowWidth() / 4;
    const GLsizei kSubImageHeight = getWindowHeight() / 4;
    // Sub-Image Offsets
    const GLint kXOffset = getWindowWidth() - kSubImageWidth;
    const GLint kYOffset = getWindowHeight() - kSubImageHeight;
};

//  The test verifies that glCopyTexSubImage2D generates a GL_INVALID_OPERATION error
//  when the read buffer is GL_NONE.
//  Reference: GLES 3.0.4, Section 3.8.5 Alternate Texture Image Specification Commands
TEST_P(CopyTexImageTestES3, ReadBufferIsNone)
{
    initializeResources(GL_RGBA, GL_UNSIGNED_BYTE);

    GLTexture tex;
    glBindTexture(GL_TEXTURE_2D, tex);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    glBindFramebuffer(GL_FRAMEBUFFER, mFbos[0]);
    glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 0, 0, kFboSizes[0], kFboSizes[0], 0);

    glReadBuffer(GL_NONE);

    EXPECT_GL_NO_ERROR();
    glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, 4, 4);
    EXPECT_GL_ERROR(GL_INVALID_OPERATION);
}

// Test CopyTexImage3D with some simple parameters with a 2D array texture.
TEST_P(CopyTexImageTestES3, 2DArraySubImage)
{
    // Seems to fail on AMD OpenGL Windows.
    ANGLE_SKIP_TEST_IF(IsAMD() && IsOpenGL() & IsWindows());

    GLTexture tex;
    glBindTexture(GL_TEXTURE_2D_ARRAY, tex);

    constexpr GLsizei kTexSize     = 4;
    constexpr GLsizei kLayerOffset = 1;
    constexpr GLsizei kLayers      = 2;

    // Clear screen to green.
    glClearColor(0, 1, 0, 1);
    glClear(GL_COLOR_BUFFER_BIT);

    // Initialize a two-layer 2D array texture with red.
    std::vector<GLColor> red(kTexSize * kTexSize * kLayers, GLColor::red);
    glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_RGBA8, kTexSize, kTexSize, kLayers, 0, GL_RGBA,
                 GL_UNSIGNED_BYTE, red.data());
    glCopyTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, kLayerOffset, 0, 0, kTexSize, kTexSize);
    ASSERT_GL_NO_ERROR();

    // Check level 0 (red from image data) and 1 (green from backbuffer clear).
    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, tex, 0, 0);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);
    glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, tex, 0, 1);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
    ASSERT_GL_NO_ERROR();
}

// Initialize the 3D texture we will copy the subImage data into
void CopyTexImageTestES3::initialize3DTexture(GLTexture &texture,
                                              const GLsizei imageWidth,
                                              const GLsizei imageHeight,
                                              const GLsizei imageDepth,
                                              const GLColor *textureData)
{
    glBindTexture(GL_TEXTURE_3D, texture);
    glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA, imageWidth, imageHeight, imageDepth, 0, GL_RGBA,
                 GL_UNSIGNED_BYTE, textureData);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}

void CopyTexImageTestES3::initialize2DTexture(GLTexture &texture,
                                              const GLsizei imageWidth,
                                              const GLsizei imageHeight,
                                              const GLColor *textureData)
{
    glBindTexture(GL_TEXTURE_2D, texture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, imageWidth, imageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 textureData);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}

void CopyTexImageTestES3::initialize2DTextureUShort4444(GLTexture &texture,
                                                        const GLsizei imageWidth,
                                                        const GLsizei imageHeight,
                                                        const GLColor *textureData)
{
    glBindTexture(GL_TEXTURE_2D, texture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, imageWidth, imageHeight, 0, GL_RGBA,
                 GL_UNSIGNED_SHORT_4_4_4_4, textureData);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}

void CopyTexImageTestES3::fillTexture(std::vector<GLColor> &texture, const GLColor color)
{
    for (auto &texel : texture)
    {
        texel = color;
    }
}

void CopyTexImageTestES3::clearTexture(GLFramebuffer &fbo, GLTexture &texture, const GLColor color)
{
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
    ASSERT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
    glClearColor(color.R, color.G, color.B, color.A);
    glClear(GL_COLOR_BUFFER_BIT);
    EXPECT_PIXEL_COLOR_EQ(0, 0, color);
}

void CopyTexImageTestES3::copyTexSubImage3D(GLTexture &subTexture2D,
                                            const GLint xOffset,
                                            const GLint yOffset,
                                            const GLsizei subImageWidth,
                                            const GLsizei subImageHeight,
                                            const GLsizei imageDepth)
{
    // Copy the 2D sub-image into the 3D texture
    for (int currLayer = 0; currLayer < imageDepth; ++currLayer)
    {
        // Bind the 2D texture to GL_COLOR_ATTACHMENT0
        glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
                               subTexture2D, 0);
        ASSERT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
        glCopyTexSubImage3D(GL_TEXTURE_3D, 0, xOffset, yOffset, currLayer, 0, 0, subImageWidth,
                            subImageHeight);
        ASSERT_GL_NO_ERROR();
    }
}

void CopyTexImageTestES3::verifyCopyTexSubImage3D(GLTexture &texture3D,
                                                  const GLint xOffset,
                                                  const GLint yOffset,
                                                  const GLColor subImageColor)
{
    // Bind to an FBO to check the copy was successful
    for (int currLayer = 0; currLayer < kImageDepth; ++currLayer)
    {
        glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, texture3D, 0, currLayer);
        ASSERT_GL_NO_ERROR();
        EXPECT_PIXEL_COLOR_EQ(xOffset, yOffset, subImageColor);
    }
}

// Test glCopyTexSubImage3D with initialized texture data
TEST_P(CopyTexImageTestES3, 3DSubImageRawTextureData)
{
    // Texture data
    std::vector<GLColor> textureData(kImageWidth * kImageHeight * kImageDepth);

    // Fill the textures with color
    fillTexture(textureData, GLColor::red);

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);

    GLTexture texture3D;
    initialize3DTexture(texture3D, kImageWidth, kImageHeight, kImageDepth, textureData.data());

    // The 2D texture that will be the sub-image copied into the destination texture
    GLTexture subTexture2D;
    initialize2DTexture(subTexture2D, kSubImageWidth, kSubImageHeight, nullptr);
    clearTexture(fbo, subTexture2D, kSubImageColor);

    // Copy the 2D subimage into the 3D texture
    copyTexSubImage3D(subTexture2D, kXOffset, kYOffset, kSubImageWidth, kSubImageHeight,
                      kImageDepth);

    // Verify the color wasn't overwritten
    verifyCopyTexSubImage3D(texture3D, 0, 0, GLColor::red);
    // Verify the copy succeeded
    verifyCopyTexSubImage3D(texture3D, kXOffset, kYOffset, kSubImageColor);

    glBindFramebuffer(GL_FRAMEBUFFER, 0);
    glBindTexture(GL_TEXTURE_2D, 0);
    glBindTexture(GL_TEXTURE_3D, 0);
}

// Test glCopyTexSubImage3D with initialized texture data that was drawn to
TEST_P(CopyTexImageTestES3, 3DSubImageDrawTextureData)
{
    // TODO(anglebug.com/3801)
    ANGLE_SKIP_TEST_IF(IsWindows() && IsD3D11());

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);

    // The 3D texture we will copy the sub-image into
    GLTexture texture3D;
    initialize3DTexture(texture3D, kImageWidth, kImageHeight, kImageDepth, nullptr);

    // Draw to each layer in the 3D texture
    for (int currLayer = 0; currLayer < kImageDepth; ++currLayer)
    {
        ANGLE_GL_PROGRAM(greenProgram, essl1_shaders::vs::Simple(), essl1_shaders::fs::Green());
        glFramebufferTextureLayer(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, texture3D, 0,
                                  currLayer);
        glFramebufferTextureLayer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, texture3D, 0,
                                  currLayer);
        ASSERT_GL_NO_ERROR();
        glUseProgram(greenProgram);
        drawQuad(greenProgram.get(), std::string(essl1_shaders::PositionAttrib()), 0.0f);
        ASSERT_GL_NO_ERROR();
        EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
    }

    // The 2D texture that will be the sub-image copied into the destination texture
    GLTexture subTexture2D;
    initialize2DTexture(subTexture2D, kSubImageWidth, kSubImageHeight, nullptr);
    clearTexture(fbo, subTexture2D, kSubImageColor);

    // Copy the 2D sub-image into the 3D texture
    copyTexSubImage3D(subTexture2D, kXOffset, kYOffset, kSubImageWidth, kSubImageHeight,
                      kImageDepth);

    // Verify the color wasn't overwritten
    verifyCopyTexSubImage3D(texture3D, 0, 0, GLColor::green);
    // Verify the copy succeeded
    verifyCopyTexSubImage3D(texture3D, kXOffset, kYOffset, kSubImageColor);

    glBindFramebuffer(GL_FRAMEBUFFER, 0);
    glBindTexture(GL_TEXTURE_2D, 0);
    glBindTexture(GL_TEXTURE_3D, 0);
}

// Test glCopyTexSubImage3D with mismatched texture formats
TEST_P(CopyTexImageTestES3, 3DSubImageDrawMismatchedTextureTypes)
{
    // TODO(anglebug.com/3801)
    ANGLE_SKIP_TEST_IF(IsWindows() && IsD3D11());

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);

    // The 3D texture we will copy the sub-image into
    GLTexture texture3D;
    initialize3DTexture(texture3D, kImageWidth, kImageHeight, kImageDepth, nullptr);

    // Draw to each layer in the 3D texture
    for (int currLayer = 0; currLayer < kImageDepth; ++currLayer)
    {
        ANGLE_GL_PROGRAM(greenProgram, essl1_shaders::vs::Simple(), essl1_shaders::fs::Green());
        glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, texture3D, 0, currLayer);
        ASSERT_GL_NO_ERROR();
        glUseProgram(greenProgram);
        drawQuad(greenProgram.get(), std::string(essl1_shaders::PositionAttrib()), 0.0f);
        ASSERT_GL_NO_ERROR();
        EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
    }

    // The 2D texture that will be the sub-image copied into the destination texture
    GLTexture subTexture2D;
    initialize2DTextureUShort4444(subTexture2D, kSubImageWidth, kSubImageHeight, nullptr);
    clearTexture(fbo, subTexture2D, kSubImageColor);

    // Copy the 2D sub-image into the 3D texture
    copyTexSubImage3D(subTexture2D, kXOffset, kYOffset, kSubImageWidth, kSubImageHeight,
                      kImageDepth);

    // Verify the color wasn't overwritten
    verifyCopyTexSubImage3D(texture3D, 0, 0, GLColor::green);
    // Verify the copy succeeded
    verifyCopyTexSubImage3D(texture3D, kXOffset, kYOffset, kSubImageColor);

    glBindFramebuffer(GL_FRAMEBUFFER, 0);
    glBindTexture(GL_TEXTURE_2D, 0);
    glBindTexture(GL_TEXTURE_3D, 0);
}

// Use this to select which configurations (e.g. which renderer, which GLES major version) these
// tests should be run against.
ANGLE_INSTANTIATE_TEST(CopyTexImageTest,
                       ES2_D3D9(),
                       ES2_D3D11(),
                       ES2_D3D11_PRESENT_PATH_FAST(),
                       ES2_METAL(),
                       ES2_OPENGL(),
                       ES2_OPENGLES(),
                       ES2_VULKAN(),
                       ES3_VULKAN());

ANGLE_INSTANTIATE_TEST_ES3(CopyTexImageTestES3);
}  // namespace angle