syoyo / nanovg-nanort

NanoRT(SW ray tracer) backend for NanoVG

NanoRT backend for NanoVG

nanovg-nanort is a CPU backend using software ray tracer(NanoRT) for Mikko Mononen’s awesome vector graphics renderer NanoVG(https://github.com/memononen/nanovg).

nanovg-nanort does not require OpenGL environment, thus it can draw vector graphics in various environment(e.g. server-side, no-GPU/no-OpenGL machine, virtual machine environment, etc).

In contrast to default OpenGL backend for NanoVG, nanovg-nanort requires C++(C++-98 + STL) compiler.

How to use.

Simply copy src/** files to your project. See example/example_rt.cc for example.

#include "nanovg.h"

// Defined these in *one* .cc
#define NANOVG_RT_IMPLEMENTATION
#define NANORT_IMPLEMENTATION
#include "nanovg_rt.h"

NVGcontext* vg = NULL;

int winWidth = 1024;
int winHeight = 1024;
float pxRatio = 1.0f;

vg = nvgCreateRT(NVG_DEBUG, winWidth, winHeight);
if (vg == NULL) {
	printf("Could not init nanovg.\n");
	return -1;
}

nvgClearBackgroundRT(vg, 0.3f, 0.3f, 0.32f, 1.0f);

nvgBeginFrame(vg, winWidth, winHeight, pxRatio);

// ... call nvg API here as usual ...

nvgEndFrame(vg);

// Grab rendered image
unsigned char* rgba = nvgReadPixelsRT(vg);

//stbi_write_png("render.png",  winWidth, winHeight, 4, rgba, winWidth * 4);

nvgDeleteRT(vg);

TODO

• Anti-alasing.
• compositeOperation
• Robust alpha-blending.
• Premultiplied alpha validation.
• Optimization.
  • Draw call optimization.
  • Multi-threaded rendering.

License

nanovg-nanort is licensed under zlib license. See LICENSE.txt for details. NanoVG is licensed under zlib license. NanoRT is licensed under MIT license.