bool RGBtoRGBA::supports(const PixelFormat& targetFormat,
const PixelFormat& sourceFormat)
{
if (targetFormat.type() != sourceFormat.type())
return false;
if (targetFormat.semantic() != PixelFormat::RGBA ||
sourceFormat.semantic() != PixelFormat::RGB)
{
return false;
}
return true;
}
std::string stringCast(PixelFormat format)
{
return std::string(stringCast(format.semantic())) + stringCast(format.type());
}
GLenum convertToGL(const PixelFormat& format, bool sRGB)
{
switch (format.type())
{
case PixelFormat::UINT8:
{
switch (format.semantic())
{
case PixelFormat::L:
{
if (sRGB)
return GL_SLUMINANCE8;
else
return GL_LUMINANCE8;
}
case PixelFormat::LA:
{
if (sRGB)
return GL_SLUMINANCE8_ALPHA8;
else
return GL_LUMINANCE8_ALPHA8;
}
case PixelFormat::RGB:
{
if (sRGB)
return GL_SRGB8;
else
return GL_RGB8;
}
case PixelFormat::RGBA:
{
if (sRGB)
return GL_SRGB8_ALPHA8;
else
return GL_RGBA8;
}
default:
break;
}
break;
}
case PixelFormat::UINT16:
{
if (format.semantic() == PixelFormat::DEPTH)
return GL_DEPTH_COMPONENT16;
break;
}
case PixelFormat::UINT24:
{
if (format.semantic() == PixelFormat::DEPTH)
return GL_DEPTH_COMPONENT24;
break;
}
case PixelFormat::UINT32:
{
if (format.semantic() == PixelFormat::DEPTH)
return GL_DEPTH_COMPONENT32;
break;
}
case PixelFormat::FLOAT16:
{
switch (format.semantic())
{
case PixelFormat::L:
{
if (!GLEW_ARB_texture_float)
{
logError("Half-precision floating point textures not supported; "
"cannot convert pixel format");
return 0;
}
return GL_LUMINANCE16F_ARB;
}
case PixelFormat::LA:
{
if (!GLEW_ARB_texture_float)
{
logError("Half-precision floating point textures not supported; "
"cannot convert pixel format");
return 0;
}
return GL_LUMINANCE_ALPHA16F_ARB;
}
case PixelFormat::RGB:
return GL_RGB16F;
case PixelFormat::RGBA:
return GL_RGBA16F;
default:
break;
}
break;
}
case PixelFormat::FLOAT32:
{
switch (format.semantic())
{
case PixelFormat::L:
{
if (!GLEW_ARB_texture_float)
{
logError("Floating point textures not supported; cannot convert pixel format");
return 0;
}
return GL_LUMINANCE32F_ARB;
}
case PixelFormat::LA:
{
if (!GLEW_ARB_texture_float)
{
logError("Floating point textures not supported; cannot convert pixel format");
return 0;
}
return GL_LUMINANCE_ALPHA32F_ARB;
}
case PixelFormat::RGB:
return GL_RGB32F;
case PixelFormat::RGBA:
return GL_RGBA32F;
default:
break;
}
break;
}
default:
break;
}
logError("No OpenGL equivalent for pixel format %s",
format.asString().c_str());
return 0;
}