// Check if the given image format and datatype are compatible.
// Also check for types/formats defined by GL extensions here.
bool
PixelFormatsTest::CompatibleFormatAndType(GLenum format, GLenum datatype) const
{
// Special case: GL_BGR can't be used with packed types!
// This has to do with putting the most color bits in red and green,
// not blue.
if (format == GL_BGR && IsPackedType(datatype))
return false;
if (datatype == GL_HALF_FLOAT_ARB && !haveHalfFloat)
return false;
if (format == GL_ABGR_EXT && !haveABGR)
return false;
// Special case: GL_ABGR_EXT can't be used with packed types
// because the packed formats specs (which were all written after the
// GL_EXT_abgr) explicitly say that the packed formats can only be used
// with GL_RGB, GL_BGR, GL_RGBA, or GL_BGRA and do not mention
// GL_ABGR_EXT.
if (format == GL_ABGR_EXT && IsPackedType(datatype))
return false;
if (format == GL_RG && !haveRG)
return false;
if (datatype == GL_UNSIGNED_INT_5_9_9_9_REV && !haveTexSharedExp)
return false;
const int formatComps = NumberOfComponentsInFormat(format);
const int typeComps = NumberOfComponentsInPackedType(datatype);
return formatComps == typeComps || typeComps == 0;
}
// Check if the given image format and datatype are compatible.
// Also check for types/formats defined by GL extensions here.
bool
PixelFormatsTest::CompatibleFormatAndType(GLenum format, GLenum datatype) const
{
// Special case: GL_BGR can't be used with packed types!
// This has to do with putting the most color bits in red and green,
// not blue.
if (format == GL_BGR && IsPackedType(datatype))
return false;
#ifdef GL_ARB_half_float_pixel
if (datatype == GL_HALF_FLOAT_ARB && !haveHalfFloat)
return false;
#endif
#ifdef GL_EXT_abgr
if (format == GL_ABGR_EXT && !haveABGR)
return false;
#endif
const int formatComps = NumberOfComponentsInFormat(format);
const int typeComps = NumberOfComponentsInPackedType(datatype);
return formatComps == typeComps || typeComps == 0;
}
static int
IsPackedType(GLenum datatype)
{
return NumberOfComponentsInPackedType(datatype) > 0;
}
