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.

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 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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 THE SOFTWARE.
 ****************************************************************************/
 
#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