//
// Copyright 2020 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
//    names, trademarks, service marks, or product names of the Licensor
//    and its affiliates, except as required to comply with Section 4(c) of
//    the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#include <GL/glew.h>
#include "pxr/base/gf/vec4f.h"
#include "pxr/base/tf/diagnostic.h"


#include "pxr/imaging/hgiGL/conversions.h"
#include "pxr/imaging/hgiGL/diagnostic.h"
#include "pxr/imaging/hgiGL/sampler.h"

PXR_NAMESPACE_OPEN_SCOPE


HgiGLSampler::HgiGLSampler(HgiSamplerDesc const& desc)
    : HgiSampler(desc)
    , _samplerId(0)
{
    glCreateSamplers(1, &_samplerId);

    if (!_descriptor.debugName.empty()) {
        glObjectLabel(GL_SAMPLER, _samplerId,-1, _descriptor.debugName.c_str());
    }

    glSamplerParameteri(
        _samplerId,
        GL_TEXTURE_WRAP_S,
        HgiGLConversions::GetSamplerAddressMode(desc.addressModeU));

    glSamplerParameteri(
        _samplerId,
        GL_TEXTURE_WRAP_T,
        HgiGLConversions::GetSamplerAddressMode(desc.addressModeV));

    glSamplerParameteri(
        _samplerId,
        GL_TEXTURE_WRAP_R,
        HgiGLConversions::GetSamplerAddressMode(desc.addressModeW));

    glSamplerParameteri(
        _samplerId,
        GL_TEXTURE_MIN_FILTER,
        HgiGLConversions::GetMinFilter(desc.minFilter, desc.mipFilter));

    glSamplerParameteri(
        _samplerId,
        GL_TEXTURE_MAG_FILTER,
        HgiGLConversions::GetMagFilter(desc.magFilter));

    static const GfVec4f borderColor(0);
    glSamplerParameterfv(
        _samplerId,
        GL_TEXTURE_BORDER_COLOR,
        borderColor.GetArray());

    static const float maxAnisotropy = 16.0;

    glSamplerParameterf(
        _samplerId,
        GL_TEXTURE_MAX_ANISOTROPY_EXT,
        maxAnisotropy);

    HGIGL_POST_PENDING_GL_ERRORS();
}

HgiGLSampler::~HgiGLSampler()
{
    glDeleteSamplers(1, &_samplerId);
    _samplerId = 0;
    HGIGL_POST_PENDING_GL_ERRORS();
}

uint64_t
HgiGLSampler::GetRawResource() const
{
    return (uint64_t) _samplerId;
}

uint32_t
HgiGLSampler::GetSamplerId() const
{
    return _samplerId;
}

PXR_NAMESPACE_CLOSE_SCOPE