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Use etc2_decode_image decode etc1 to RGBA8888 [skip appveyor] [skip travis] 

This can avoid further texture data convert
This commit is contained in:
halx99 2020-08-31 15:32:59 +08:00
parent 8749c63346
commit b12068e1c8
1 changed files with 8 additions and 9 deletions
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17
cocos/platform/CCImage.cpp
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@ -1532,7 +1532,7 @@ bool Image::initWithETCData(const unsigned char* data, ssize_t dataLen, bool own
else
compressedFormat = backend::PixelFormat::NONE;
if (compressedFormat != backend::PixelFormat::NONE)
if (compressedFormat != backend::PixelFormat::NONE && false)
{
//old opengl version has no define for GL_ETC1_RGB8_OES, add macro to make compiler happy.
#if defined(GL_ETC1_RGB8_OES) || defined(CC_USE_METAL)
@ -1552,15 +1552,13 @@ bool Image::initWithETCData(const unsigned char* data, ssize_t dataLen, bool own
CCLOG("cocos2d: Hardware ETC1 decoder not present. Using software decoder");
bool ret = true;
//if it is not gles or device do not support ETC, decode texture by software
int bytePerPixel = 3;
unsigned int stride = _width * bytePerPixel;
_pixelFormat = backend::PixelFormat::RGB888;
_dataLen = _width * _height * bytePerPixel;
// if it is not gles or device do not support ETC1, decode texture by software
// directly decode ETC1_RGB to RGBA8888
_pixelFormat = backend::PixelFormat::RGBA8888;
_dataLen = _width * _height * 4;
_data = static_cast<unsigned char*>(malloc(_dataLen * sizeof(unsigned char)));
if (etc1_decode_image(static_cast<const unsigned char*>(data) + ETC_PKM_HEADER_SIZE, static_cast<etc1_byte*>(_data), _width, _height, bytePerPixel, stride) != 0)
if (etc2_decode_image(ETC2_RGB_NO_MIPMAPS, static_cast<const unsigned char*>(data) + ETC2_PKM_HEADER_SIZE, static_cast<etc2_byte*>(_data), _width, _height) != 0)
{
_dataLen = 0;
if (_data != nullptr)
@ -1572,6 +1570,7 @@ bool Image::initWithETCData(const unsigned char* data, ssize_t dataLen, bool own
}
if (ownData) free((void*)data);
return ret;
}