Nanovg - render to framebuffer

nanovg_fb.cpp

nvgImageSize(vg, fb->image, &fboWidth, &fboHeight);
	winWidth = (int)(fboWidth / pxRatio);
	winHeight = (int)(fboHeight / pxRatio);

	// Draw some stuff to an FBO as a test
	nvgluBindFramebuffer(fb);
	glViewport(0, 0, fboWidth, fboHeight);
	glClearColor(0, 0, 0, 0);
	glClear(GL_COLOR_BUFFER_BIT|GL_STENCIL_BUFFER_BIT);
	nvgBeginFrame(vg, winWidth, winHeight, pxRatio);

	pw = (int)ceilf(winWidth / s);
	ph = (int)ceilf(winHeight / s);

	nvgBeginPath(vg);
	for (y = 0; y < ph; y++) {
		for (x = 0; x < pw; x++) {
			float cx = (x+0.5f) * s;
			float cy = (y+0.5f) * s;
			nvgCircle(vg, cx,cy, r);
		}
	}
	nvgFillColor(vg, nvgRGBA(220,160,0,200));
	nvgFill(vg);

	nvgEndFrame(vg);
nvgluBindFramebuffer(NULL);