// Copyright 2017 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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#include "dawn/native/opengl/PersistentPipelineStateGL.h"

#include "dawn/native/opengl/OpenGLFunctions.h"
#include "dawn/native/opengl/UtilsGL.h"

namespace dawn::native::opengl {

MaybeError PersistentPipelineState::SetDefaultState(const OpenGLFunctions& gl) {
    return CallGLStencilFunc(gl);
}

MaybeError PersistentPipelineState::SetStencilFuncsAndMask(const OpenGLFunctions& gl,
                                                           GLenum stencilBackCompareFunction,
                                                           GLenum stencilFrontCompareFunction,
                                                           uint32_t stencilReadMask) {
    if (mStencilBackCompareFunction == stencilBackCompareFunction &&
        mStencilFrontCompareFunction == stencilFrontCompareFunction &&
        mStencilReadMask == stencilReadMask) {
        return {};
    }

    mStencilBackCompareFunction = stencilBackCompareFunction;
    mStencilFrontCompareFunction = stencilFrontCompareFunction;
    mStencilReadMask = stencilReadMask;
    return CallGLStencilFunc(gl);
}

MaybeError PersistentPipelineState::SetStencilReference(const OpenGLFunctions& gl,
                                                        uint32_t stencilReference) {
    if (mStencilReference == stencilReference) {
        return {};
    }

    mStencilReference = stencilReference;
    return CallGLStencilFunc(gl);
}

MaybeError PersistentPipelineState::CallGLStencilFunc(const OpenGLFunctions& gl) {
    DAWN_GL_TRY(gl, StencilFuncSeparate(GL_BACK, mStencilBackCompareFunction, mStencilReference,
                                        mStencilReadMask));
    DAWN_GL_TRY(gl, StencilFuncSeparate(GL_FRONT, mStencilFrontCompareFunction, mStencilReference,
                                        mStencilReadMask));
    return {};
}

}  // namespace dawn::native::opengl