// Copyright 2017 The NXT Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "backend/opengl/PersistentPipelineStateGL.h"

#include "backend/opengl/OpenGLBackend.h"

namespace backend {
namespace opengl {

    void PersistentPipelineState::SetDefaultState() {
        CallGLStencilFunc();
    }

    void PersistentPipelineState::SetStencilFuncsAndMask(GLenum stencilBackCompareFunction, GLenum stencilFrontCompareFunction, uint32_t stencilReadMask) {
        if (this->stencilBackCompareFunction == stencilBackCompareFunction &&
            this->stencilFrontCompareFunction == stencilFrontCompareFunction &&
            this->stencilReadMask == stencilReadMask) {
            return;
        }

        this->stencilBackCompareFunction = stencilBackCompareFunction;
        this->stencilFrontCompareFunction = stencilFrontCompareFunction;
        this->stencilReadMask = stencilReadMask;
        CallGLStencilFunc();
    }

    void PersistentPipelineState::SetStencilReference(uint32_t stencilReference) {
        if (this->stencilReference == stencilReference) {
            return;
        }

        this->stencilReference = stencilReference;
        CallGLStencilFunc();
    }

    void PersistentPipelineState::CallGLStencilFunc() {
        glStencilFuncSeparate(GL_BACK,
                stencilBackCompareFunction,
                stencilReference,
                stencilReadMask);
        glStencilFuncSeparate(GL_FRONT,
                stencilFrontCompareFunction,
                stencilReference,
                stencilReadMask);
    }

}
}