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Prefer BGRA uploading to swizzling

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The older BGRA extension is more likely to have stable driver support.

Fixes: QTBUG-74150
Change-Id: If321b3024fbdeb9e199880744b9ee915b3b2bf6c
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
This commit is contained in:
Allan Sandfeld Jensen 2019-03-01 14:39:25 +01:00
parent a74b2b5f15
commit 55cc93e9d6
1 changed files with 13 additions and 18 deletions
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31
src/gui/opengl/qopengltextureuploader.cpp
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@ -114,6 +114,18 @@ qsizetype QOpenGLTextureUploader::textureImage(GLenum target, const QImage &imag
externalFormat = GL_BGRA;
internalFormat = GL_RGBA;
pixelType = GL_UNSIGNED_INT_8_8_8_8_REV;
#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
// Without GL_UNSIGNED_INT_8_8_8_8_REV, BGRA only matches ARGB on little endian:
} else if (funcs->hasOpenGLExtension(QOpenGLExtensions::BGRATextureFormat) && !sRgbBinding) {
// The GL_EXT_texture_format_BGRA8888 extension requires the internal format to match the external.
externalFormat = internalFormat = GL_BGRA;
pixelType = GL_UNSIGNED_BYTE;
} else if (context->isOpenGLES() && context->hasExtension(QByteArrayLiteral("GL_APPLE_texture_format_BGRA8888"))) {
// Is only allowed as an external format like OpenGL.
externalFormat = GL_BGRA;
internalFormat = GL_RGBA;
pixelType = GL_UNSIGNED_BYTE;
#endif
} else if (funcs->hasOpenGLExtension(QOpenGLExtensions::TextureSwizzle)) {
#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
GLint swizzle[4] = { GL_BLUE, GL_GREEN, GL_RED, GL_ALPHA };
@ -125,25 +137,8 @@ qsizetype QOpenGLTextureUploader::textureImage(GLenum target, const QImage &imag
externalFormat = internalFormat = GL_RGBA;
pixelType = GL_UNSIGNED_BYTE;
} else {
#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
// Without GL_UNSIGNED_INT_8_8_8_8_REV, BGRA only matches ARGB on little endian.
if (funcs->hasOpenGLExtension(QOpenGLExtensions::BGRATextureFormat) && !sRgbBinding) {
// The GL_EXT_texture_format_BGRA8888 extension requires the internal format to match the external.
externalFormat = internalFormat = GL_BGRA;
pixelType = GL_UNSIGNED_BYTE;
} else if (context->isOpenGLES() && context->hasExtension(QByteArrayLiteral("GL_APPLE_texture_format_BGRA8888"))) {
// Is only allowed as an external format like OpenGL.
externalFormat = GL_BGRA;
internalFormat = GL_RGBA;
pixelType = GL_UNSIGNED_BYTE;
} else {
// No support for direct ARGB32 upload.
break;
}
#else
// Big endian requires GL_UNSIGNED_INT_8_8_8_8_REV for ARGB to match BGRA
// No support for direct ARGB32 upload.
break;
#endif
}
targetFormat = image.format();
break;