axmol/cocos/renderer/backend/metal/UtilsMTL.mm

/****************************************************************************
 Copyright (c) 2018-2019 Xiamen Yaji Software Co., Ltd.
 Copyright (c) 2020 c4games.com

 http://www.cocos2d-x.org

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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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#include "UtilsMTL.h"
#include "DeviceMTL.h"
#include "DeviceInfoMTL.h"
#include "TextureMTL.h"
#include "../TextureUtils.h"
#include "base/CCConfiguration.h"

CC_BACKEND_BEGIN

id<MTLTexture> UtilsMTL::_defaultColorAttachmentTexture        = nil;
id<MTLTexture> UtilsMTL::_defaultDepthStencilAttachmentTexture = nil;

namespace
{
MTLPixelFormat getSupportedDepthStencilFormat()
{
    MTLPixelFormat pixelFormat = MTLPixelFormatDepth32Float_Stencil8;
#if (CC_TARGET_PLATFORM == CC_PLATFORM_MAC)
    bool isDepth24Stencil8PixelFormatSupported = DeviceInfoMTL::supportD24S8();
    if (isDepth24Stencil8PixelFormatSupported)
        pixelFormat = MTLPixelFormatDepth24Unorm_Stencil8;
#endif
    return pixelFormat;
}
}

struct GPUTextureFormatInfo
{
    MTLPixelFormat fmt;
    MTLPixelFormat fmtSrgb;
};

static GPUTextureFormatInfo s_textureFormats[] = {
    /* pvrtc v1 */
    {MTLPixelFormat(162 /*PVRTC_RGB_4BPP*/), MTLPixelFormat(163 /*PVRTC_RGB_4BPP_sRGB*/)},    // PTC14
    {MTLPixelFormat(166 /*PVRTC_RGBA_4BPP*/), MTLPixelFormat(167 /*PVRTC_RGBA_4BPP_sRGB*/)},  // PTC14A
    {MTLPixelFormat(160 /*PVRTC_RGB_2BPP*/), MTLPixelFormat(161 /*PVRTC_RGB_2BPP_sRGB*/)},    // PTC12
    {MTLPixelFormat(164 /*PVRTC_RGBA_2BPP*/), MTLPixelFormat(165 /*PVRTC_RGBA_2BPP_sRGB*/)},  // PTC12A

    /* etc */
    {MTLPixelFormat(180 /*ETC2_RGB8*/), MTLPixelFormat(181 /*ETC2_RGB8_sRGB*/)},  // ETC1
    {MTLPixelFormat(180 /*ETC2_RGB8*/), MTLPixelFormat(181 /*ETC2_RGB8_sRGB*/)},  // ETC2
    {MTLPixelFormat(178 /*EAC_RGBA8*/), MTLPixelFormat(179 /*EAC_RGBA8_sRGB*/)},  // ETC2A

    /* s3tc */
    {MTLPixelFormat(130 /*BC1_RGBA*/), MTLPixelFormat(131 /*BC1_RGBA_sRGB*/)},  // S3TC_DXT1/BC1
    {MTLPixelFormat(132 /*BC2_RGBA*/), MTLPixelFormat(133 /*BC2_RGBA_sRGB*/)},  // S3TC_DXT3/BC2
    {MTLPixelFormat(134 /*BC3_RGBA*/), MTLPixelFormat(135 /*BC3_RGBA_sRGB*/)},  // S3TC_DXT5/BC3

    /* atc */
    {MTLPixelFormatInvalid, MTLPixelFormatInvalid},  // ATC_RGB
    {MTLPixelFormatInvalid, MTLPixelFormatInvalid},  // ATC_EXPLICIT_ALPHA
    {MTLPixelFormatInvalid, MTLPixelFormatInvalid},  // ATC_INTERPOLATED_ALPHA

/* astc */
#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    {MTLPixelFormatASTC_4x4_LDR, MTLPixelFormatASTC_4x4_sRGB},    // ASTC4x4
    {MTLPixelFormatASTC_5x5_LDR, MTLPixelFormatASTC_5x5_sRGB},    // ASTC5x5
    {MTLPixelFormatASTC_6x6_LDR, MTLPixelFormatASTC_6x6_sRGB},    // ASTC6x6
    {MTLPixelFormatASTC_8x5_LDR, MTLPixelFormatASTC_8x5_sRGB},    // ASTC8x5
    {MTLPixelFormatASTC_8x6_LDR, MTLPixelFormatASTC_8x6_sRGB},    // ASTC8x6
    {MTLPixelFormatASTC_8x8_LDR, MTLPixelFormatASTC_8x8_sRGB},    // ASTC8x8
    {MTLPixelFormatASTC_10x5_LDR, MTLPixelFormatASTC_10x5_sRGB},  // ASTC10x5
#else
    {MTLPixelFormatInvalid, MTLPixelFormatInvalid},  // ASTC4x4
    {MTLPixelFormatInvalid, MTLPixelFormatInvalid},  // ASTC5x5
    {MTLPixelFormatInvalid, MTLPixelFormatInvalid},  // ASTC6x6
    {MTLPixelFormatInvalid, MTLPixelFormatInvalid},  // ASTC8x5
    {MTLPixelFormatInvalid, MTLPixelFormatInvalid},  // ASTC8x6
    {MTLPixelFormatInvalid, MTLPixelFormatInvalid},  // ASTC8x8
    {MTLPixelFormatInvalid, MTLPixelFormatInvalid},  // ASTC10x5
#endif

    /* normal */
    {MTLPixelFormatRGBA8Unorm, MTLPixelFormatRGBA8Unorm_sRGB},    // RGBA8
    {MTLPixelFormatBGRA8Unorm, MTLPixelFormatBGRA8Unorm_sRGB},    // BGRA8
    {MTLPixelFormatInvalid, MTLPixelFormatInvalid},               // RGB8
    {MTLPixelFormat(40 /*B5G6R5Unorm*/), MTLPixelFormatInvalid},  // R5G6B5
    {MTLPixelFormat(42 /*ABGR4Unorm*/), MTLPixelFormatInvalid},   // RGBA4
    {MTLPixelFormat(41 /*A1BGR5Unorm*/), MTLPixelFormatInvalid},  // RGB5A1
    {MTLPixelFormatA8Unorm, MTLPixelFormatInvalid},               // A8
    {MTLPixelFormatInvalid, MTLPixelFormatInvalid},               // L8
    {MTLPixelFormatInvalid, MTLPixelFormatInvalid},               // LA8

    /* depth stencil */
    {MTLPixelFormat(255 /*Depth24Unorm_Stencil8*/), MTLPixelFormatInvalid},  // D24S8
};
static_assert(CC_ARRAYSIZE(s_textureFormats) == (int)PixelFormat::COUNT,
              "The OpenGL GPU texture format info table incomplete!");

void UtilsMTL::initGPUTextureFormats()
{
    // on mac, D24S8 means MTLPixelFormatDepth24Unorm_Stencil8, while on ios it means
    // MTLPixelFormatDepth32Float_Stencil8
    auto& info = s_textureFormats[(int)PixelFormat::D24S8];
    info.fmt   = getSupportedDepthStencilFormat();
}

id<MTLTexture> UtilsMTL::getDefaultDepthStencilTexture()
{
    if (!_defaultDepthStencilAttachmentTexture)
        _defaultDepthStencilAttachmentTexture = UtilsMTL::createDepthStencilAttachmentTexture();

    return _defaultDepthStencilAttachmentTexture;
}

void UtilsMTL::updateDefaultColorAttachmentTexture(id<MTLTexture> texture)
{
    UtilsMTL::_defaultColorAttachmentTexture = texture;
}

MTLPixelFormat UtilsMTL::toMTLPixelFormat(PixelFormat textureFormat)
{
    if (UTILS_LIKELY(textureFormat < PixelFormat::COUNT))
    {
        return s_textureFormats[(int)textureFormat].fmt;
    }
    return MTLPixelFormatInvalid;
}

void UtilsMTL::resizeDefaultAttachmentTexture(std::size_t width, std::size_t height)
{
    [backend::DeviceMTL::getCAMetalLayer() setDrawableSize:CGSizeMake(width, height)];
    [_defaultDepthStencilAttachmentTexture release];
    _defaultDepthStencilAttachmentTexture = UtilsMTL::createDepthStencilAttachmentTexture();
}

id<MTLTexture> UtilsMTL::createDepthStencilAttachmentTexture()
{
    auto CAMetalLayer                       = DeviceMTL::getCAMetalLayer();
    MTLTextureDescriptor* textureDescriptor = [[MTLTextureDescriptor alloc] init];
    textureDescriptor.width                 = CAMetalLayer.drawableSize.width;
    textureDescriptor.height                = CAMetalLayer.drawableSize.height;
    textureDescriptor.pixelFormat           = s_textureFormats[(int)PixelFormat::D24S8].fmt;
    textureDescriptor.resourceOptions       = MTLResourceStorageModePrivate;
    textureDescriptor.usage                 = MTLTextureUsageRenderTarget;
    auto ret                                = [CAMetalLayer.device newTextureWithDescriptor:textureDescriptor];
    [textureDescriptor release];

    return ret;
}

void UtilsMTL::generateMipmaps(id<MTLTexture> texture)
{
    auto commandQueue                        = static_cast<DeviceMTL*>(DeviceMTL::getInstance())->getMTLCommandQueue();
    auto commandBuffer                       = [commandQueue commandBuffer];
    id<MTLBlitCommandEncoder> commandEncoder = [commandBuffer blitCommandEncoder];
    [commandEncoder generateMipmapsForTexture:texture];
    [commandEncoder endEncoding];
    [commandBuffer commit];
}

void UtilsMTL::swizzleImage(unsigned char* image, std::size_t width, std::size_t height, MTLPixelFormat format)
{
    if (!image)
        return;

    auto len = width * height;
    switch (format)
    {
    // convert to RGBA
    case MTLPixelFormatBGRA8Unorm:
        for (int i = 0; i < len; i++)
        {
            unsigned char temp = image[i * 4];
            image[i * 4]       = image[i * 4 + 2];
            image[i * 4 + 2]   = temp;
        }
        break;

    default:
        break;
    }
}

CC_BACKEND_END