/*
 * Copyright (C) 2017 Apple Inc. All rights reserved.
 * Copyright (C) 2017 Yuichiro Kikura (y.kikura@gmail.com)
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

[
    Conditional=WEBMETAL,
    EnabledAtRuntime=WebMetal,
    JSCustomMarkFunction,
    DoNotCheckConstants
] interface WebMetalRenderingContext {
    // back-reference to the canvas
    readonly attribute HTMLCanvasElement canvas;

    // Pixel formats

    const unsigned int PixelFormatBGRA8Unorm = 80;
    const unsigned int PixelFormatDepth32Float = 252;
    const unsigned int PixelFormatStencil8 = 253;
    const unsigned int PixelFormatInvalid = 0;

    // Load actions

    const unsigned int LoadActionDontCare = 0;
    const unsigned int LoadActionLoad = 1;
    const unsigned int LoadActionClear = 2;

    // Store actions

    const unsigned int StoreActionDontCare = 0;
    const unsigned int StoreActionStore = 1;
    const unsigned int StoreActionMultisampleResolve = 2;

    // Primitive types

    const unsigned int PrimitiveTypePoint = 0;
    const unsigned int PrimitiveTypeLine = 1;
    const unsigned int PrimitiveTypeLineStrip = 2;
    const unsigned int PrimitiveTypeTriangle = 3;
    const unsigned int PrimitiveTypeTriangleStrip = 4;

    // Comparison functions

    const unsigned int CompareFunctionNever = 0;
    const unsigned int CompareFunctionLess = 1;
    const unsigned int CompareFunctionEqual = 2;
    const unsigned int CompareFunctionLessEqual = 3;
    const unsigned int CompareFunctionGreater = 4;
    const unsigned int CompareFunctionNotEqual = 5;
    const unsigned int CompareFunctionGreaterEqual = 6;
    const unsigned int CompareFunctionAlways = 7;

    // Texture Types

    const unsigned int TextureType1D = 0;
    const unsigned int TextureType1DArray = 1;
    const unsigned int TextureType2D = 2;
    const unsigned int TextureType2DArray = 3;
    const unsigned int TextureType2DMultisample = 4;
    const unsigned int TextureTypeCube = 5;
    const unsigned int TextureTypeCubeArray = 6;
    const unsigned int TextureType3D = 7;

    // Storage modes

    const unsigned int StorageModeShared  = 0;
    const unsigned int StorageModeManaged = 1;
    const unsigned int StorageModePrivate = 2;

    // Usage

    const unsigned int TextureUsageUnknown = 0x0000;
    const unsigned int TextureUsageShaderRead = 0x0001;
    const unsigned int TextureUsageShaderWrite = 0x0002;
    const unsigned int TextureUsageRenderTarget = 0x0004;
    const unsigned int TextureUsagePixelFormatView = 0x0010;

    // Entry points

    WebMetalLibrary createLibrary(DOMString sourceCode);

    WebMetalRenderPipelineState createRenderPipelineState(WebMetalRenderPipelineDescriptor descriptor);
    WebMetalDepthStencilState createDepthStencilState(WebMetalDepthStencilDescriptor descriptor);
    WebMetalComputePipelineState createComputePipelineState(WebMetalFunction function);

    WebMetalCommandQueue createCommandQueue();

    WebMetalDrawable nextDrawable();

    WebMetalBuffer? createBuffer(ArrayBufferView data);

    WebMetalTexture createTexture(WebMetalTextureDescriptor descriptor);

};