Overloaded nvgluCreateFramebuffer functions

Added overloaded nvgluCreateFramebuffer functions for creating a framebuffer that automatically mirrors the size of the back buffer

examples/common/nanovg/nanovg_bgfx.cpp

@@ -1229,6 +1229,61 @@ NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* _ctx, int32_t _width, int32
 	return framebuffer;
 }
 
+NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* ctx, int32_t imageFlags, bgfx::ViewId viewId)
+{
+	NVGLUframebuffer* framebuffer = nvgluCreateFramebuffer(ctx, imageFlags);
+
+	if (framebuffer != NULL)
+	{
+		nvgluSetViewFramebuffer(viewId, framebuffer);
+	}
+
+	return framebuffer;
+}
+
+NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* _ctx, int32_t _imageFlags)
+{
+	BX_UNUSED(_imageFlags);
+	bgfx::TextureHandle textures[] =
+	{
+		bgfx::createTexture2D(bgfx::BackbufferRatio::Equal, false, 1, bgfx::TextureFormat::RGBA8, BGFX_TEXTURE_RT),
+		bgfx::createTexture2D(bgfx::BackbufferRatio::Equal, false, 1, bgfx::TextureFormat::D24S8, BGFX_TEXTURE_RT | BGFX_TEXTURE_RT_WRITE_ONLY)
+	};
+	bgfx::FrameBufferHandle fbh = bgfx::createFrameBuffer(
+		  BX_COUNTOF(textures)
+		, textures
+		, true
+		);
+
+	if (!bgfx::isValid(fbh) )
+	{
+		return NULL;
+	}
+
+	struct NVGparams* params = nvgInternalParams(_ctx);
+	struct GLNVGcontext* gl = (struct GLNVGcontext*)params->userPtr;
+	struct GLNVGtexture* tex = glnvg__allocTexture(gl);
+
+	if (NULL == tex)
+	{
+		bgfx::destroy(fbh);
+		return NULL;
+	}
+
+	tex->width  = 0;
+	tex->height = 0;
+	tex->type   = NVG_TEXTURE_RGBA;
+	tex->flags  = _imageFlags | NVG_IMAGE_PREMULTIPLIED;
+	tex->id     = bgfx::getTexture(fbh);
+
+	NVGLUframebuffer* framebuffer = BX_NEW(gl->allocator, NVGLUframebuffer);
+	framebuffer->ctx    = _ctx;
+	framebuffer->image  = tex->id.idx;
+	framebuffer->handle = fbh;
+
+	return framebuffer;
+}
+
 void nvgluBindFramebuffer(NVGLUframebuffer* _framebuffer)
 {
 	static NVGcontext* s_prevCtx = NULL;

examples/common/nanovg/nanovg_bgfx.h

@@ -61,6 +61,12 @@ NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* _ctx, int32_t _width, int32
 ///
 NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* _ctx, int32_t _width, int32_t _height, int32_t _imageFlags);
 
+///
+NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* _ctx, int32_t _imageFlags, bgfx::ViewId _viewId);
+
+///
+NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* _ctx, int32_t _imageFlags);
+
 ///
 void nvgluBindFramebuffer(NVGLUframebuffer* _framebuffer);