//
// Copyright 2024 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.
//

// TextureFixedRateCompressionTest: Tests for GL_EXT_texture_storage_compression

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

namespace angle
{

static constexpr GLint kDefaultAttribList[3][3] = {
    {GL_NONE, GL_NONE, GL_NONE},
    {GL_SURFACE_COMPRESSION_EXT, GL_SURFACE_COMPRESSION_FIXED_RATE_NONE_EXT, GL_NONE},
    {GL_SURFACE_COMPRESSION_EXT, GL_SURFACE_COMPRESSION_FIXED_RATE_DEFAULT_EXT, GL_NONE},
};

class TextureFixedRateCompressionTest : public ANGLETest<>
{
  protected:
    void invalidTestHelper(const GLint *attribs);
    void basicTestHelper(const GLint *attribs);
};

void TextureFixedRateCompressionTest::invalidTestHelper(const GLint *attribs)
{
    GLTexture tex;
    glBindTexture(GL_TEXTURE_2D, tex);
    ASSERT_GL_NO_ERROR();

    glTexStorageAttribs2DEXT(GL_TEXTURE_2D, 1, GL_RGBA8, 16, 16, attribs);
    ASSERT_GL_NO_ERROR();

    glBindImageTexture(0, tex, 0, GL_FALSE, 0, GL_READ_WRITE, GL_RGBA8);
    if (nullptr == attribs)
    {
        /* Default attrib which is non-compressed formats will return GL_NO_ERROR. */
        ASSERT_GL_NO_ERROR();
    }
    else if (attribs[1] == GL_SURFACE_COMPRESSION_FIXED_RATE_DEFAULT_EXT ||
             (attribs[1] >= GL_SURFACE_COMPRESSION_FIXED_RATE_1BPC_EXT &&
              attribs[1] <= GL_SURFACE_COMPRESSION_FIXED_RATE_12BPC_EXT))
    {
        /* Compressed texture is not supported in glBindImageTexture. */
        ASSERT_GL_ERROR(GL_INVALID_VALUE);
    }
    else if (attribs[1] == GL_SURFACE_COMPRESSION_FIXED_RATE_NONE_EXT || attribs[0] == GL_NONE)
    {
        /* Default attrib which is non-compressed formats will return GL_NO_ERROR. */
        ASSERT_GL_NO_ERROR();
    }
}

void TextureFixedRateCompressionTest::basicTestHelper(const GLint *attribs)
{
    GLTexture texture;
    glBindTexture(GL_TEXTURE_2D, texture);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    ASSERT_GL_NO_ERROR();

    glTexStorageAttribs2DEXT(GL_TEXTURE_2D, 1, GL_RGBA8, 16, 16, attribs);
    ASSERT_GL_NO_ERROR();

    /* Query and check the compression rate */
    GLint compressRate;
    glGetTexParameteriv(GL_TEXTURE_2D, GL_SURFACE_COMPRESSION_EXT, &compressRate);
    ASSERT_GL_NO_ERROR();

    if (nullptr != attribs && compressRate != GL_SURFACE_COMPRESSION_FIXED_RATE_NONE_EXT &&
        attribs[1] != GL_SURFACE_COMPRESSION_FIXED_RATE_DEFAULT_EXT)
    {
        EXPECT_EQ(compressRate, attribs[1]);
    }

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

    ANGLE_GL_PROGRAM(drawRed, essl1_shaders::vs::Simple(), essl1_shaders::fs::Red());
    drawQuad(drawRed, essl1_shaders::PositionAttrib(), 0);
    EXPECT_PIXEL_RECT_EQ(0, 0, 16, 16, GLColor::red);
    ASSERT_GL_NO_ERROR();
}

// Invalid attrib list, GL_INVALID_VALUE is generated.
TEST_P(TextureFixedRateCompressionTest, Invalidate)
{
    ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_texture_storage_compression"));

    constexpr GLint kAttribListInvalid[3] = {GL_SURFACE_COMPRESSION_EXT, GL_SURFACE_COMPRESSION_EXT,
                                             GL_NONE};

    GLTexture texture;
    glBindTexture(GL_TEXTURE_2D, texture);
    ASSERT_GL_NO_ERROR();

    glTexStorageAttribs2DEXT(GL_TEXTURE_2D, 1, GL_RGBA8, 16, 16, kAttribListInvalid);
    ASSERT_GL_ERROR(GL_INVALID_VALUE);

    for (const GLint *attribs : kDefaultAttribList)
    {
        invalidTestHelper(attribs);
    }
    invalidTestHelper(nullptr);
}

// Test basic usage of glTexStorageAttribs2DEXT
TEST_P(TextureFixedRateCompressionTest, TexStorageAttribs2DEXT)
{
    ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_texture_storage_compression"));

    for (const GLint *attribs : kDefaultAttribList)
    {
        basicTestHelper(attribs);
    }
}

// Use this to select which configurations (e.g. which renderer, which GLES major version) these
// tests should be run against.
ANGLE_INSTANTIATE_TEST_ES31_AND(TextureFixedRateCompressionTest);

}  // namespace angle