Check texture color formats available

[stefbuet]

This will allow you to know whether a color format is supported or not by your GPU, with OpenGL. (DirectX not handled here).
This is an Irrlicht lib modification.

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Changelog:

1/ I needed the getOpenGLFormatAndParametersFromColorFormat method from COpenGLTexture (sources) but it was protected so I moved it from protected to public.

2/ Add to IVideoDriver.hpp (includes) as public:

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//! queries the floating point texture color format support, returns true if supported
		virtual bool queryRTTColorFormat(ECOLOR_FORMAT colorFormat)=0;

3/ Add to CNullDriver.h (sources) as public:

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//! queries the floating point texture color format support, returns true if supported
		bool queryRTTColorFormat(ECOLOR_FORMAT colorFormat);

4/ I didn't know how to do this with directX, so this feature is openGL only.
Add to CNullDriver.cpp (sources) :

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//! queries the floating point texture color format support, returns true if supported
bool CNullDriver::queryRTTColorFormat(ECOLOR_FORMAT colorFormat)
{
   return false;
}

5/ Add to COpenGLDriver.h (sources) as public:

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//! queries the floating point texture color format support, returns true if supported
		virtual bool queryRTTColorFormat(ECOLOR_FORMAT colorFormat);

6/ Add to COpenGLDriver.cpp (sources):

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//! queries the floating point texture color format support, returns true if supported
bool COpenGLDriver::queryRTTColorFormat(ECOLOR_FORMAT colorFormat)
{
    GLenum colorFormatGL, typeGL;
    GLint filtering;
    COpenGLTexture *proxy=(COpenGLTexture*)addTexture(core::dimension2d<u32>(1,1), L"proxy_text");
    if(!proxy) return false;
    GLint internalFormatGL=proxy->getOpenGLFormatAndParametersFromColorFormat(colorFormat, filtering, colorFormatGL, typeGL);
    glTexImage2D(GL_PROXY_TEXTURE_2D, 0, internalFormatGL, 256, 256, 0, colorFormatGL, typeGL, 0);
    removeTexture(proxy);
    return (glGetError()==GL_NO_ERROR)
     

}

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Usage:

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//check if ECF_A16B16G16R16F is supported by the current GPU
std::cout<<"ARGB 16 bits supported?  --> "<<driver->queryRTTColorFormat(ECF_A16B16G16R16F)<<std::endl;

Note : the protected to public method from OGLTexture is a little bit annoying but I didn't find anything else to do...