qt5base-lts/examples/graphicsview/boxes/glextensions.cpp

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#include "glextensions.h"

#define RESOLVE_GL_FUNC(f) ok &= bool((f = (_gl##f) context->getProcAddress(QLatin1String("gl" #f))));

bool GLExtensionFunctions::resolve(const QGLContext *context)
{
	bool ok = true;

	RESOLVE_GL_FUNC(GenFramebuffersEXT)
	RESOLVE_GL_FUNC(GenRenderbuffersEXT)
	RESOLVE_GL_FUNC(BindRenderbufferEXT)
	RESOLVE_GL_FUNC(RenderbufferStorageEXT)
	RESOLVE_GL_FUNC(DeleteFramebuffersEXT)
	RESOLVE_GL_FUNC(DeleteRenderbuffersEXT)
	RESOLVE_GL_FUNC(BindFramebufferEXT)
	RESOLVE_GL_FUNC(FramebufferTexture2DEXT)
	RESOLVE_GL_FUNC(FramebufferRenderbufferEXT)
	RESOLVE_GL_FUNC(CheckFramebufferStatusEXT)

        RESOLVE_GL_FUNC(ActiveTexture)
	RESOLVE_GL_FUNC(TexImage3D)

        RESOLVE_GL_FUNC(GenBuffers)
	RESOLVE_GL_FUNC(BindBuffer)
	RESOLVE_GL_FUNC(BufferData)
	RESOLVE_GL_FUNC(DeleteBuffers)
	RESOLVE_GL_FUNC(MapBuffer)
	RESOLVE_GL_FUNC(UnmapBuffer)

	return ok;
}

bool GLExtensionFunctions::fboSupported() {
    return GenFramebuffersEXT
	    && GenRenderbuffersEXT
	    && BindRenderbufferEXT
	    && RenderbufferStorageEXT
	    && DeleteFramebuffersEXT
	    && DeleteRenderbuffersEXT
	    && BindFramebufferEXT
	    && FramebufferTexture2DEXT
	    && FramebufferRenderbufferEXT
	    && CheckFramebufferStatusEXT;
}

bool GLExtensionFunctions::openGL15Supported() {
    return ActiveTexture
	    && TexImage3D
            && GenBuffers
	    && BindBuffer
	    && BufferData
	    && DeleteBuffers
	    && MapBuffer
	    && UnmapBuffer;
}

#undef RESOLVE_GL_FUNC