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Implemented OGL 3.2 core profile back-end

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- moved demo stuff to separate file
- created two separate examples for gl2 and gl3
- initial stab at OGL 3.2 core profile back-end (currently twice as
slows as 2.0)
- API change: glBeginFrame() takes view witdth and height as input
- added FPS counter to demo
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Mikko Mononen 2014-02-09 17:33:31 +02:00
parent 714d18a4c6
commit 9b00b7aaf5
10 changed files with 1305 additions and 186 deletions
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README.md
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@ -17,12 +17,14 @@ The NanoVG API is modeled loosely on HTML5 canvas API. If you know canvas, you'r
## Creating drawing context
The drawing context is created using platform specific constructor function. If you're using the default OpenGL back-end the context is created as follows:
The drawing context is created using platform specific constructor function. If you're using the default OpenGL 2.0 back-end the context is created as follows:
```C
struct NVGcontext* vg = glnvgCreate(512, 512);
struct NVGcontext* vg = nvgCreateGL2(512, 512);
```
The two values passed to the constructor define the size of the texture atlas used for text rendering, 512x512 is a good starting point. If you're rendering retina sized text or plan to use a lot of different fonts, 1024x1024 is better choice.
Currently there are two different back-ends for NanoVG: [nanovg_gl2.h](/src/nanovg_gl2.h) for OpenGL 2.0 and [nanovg_gl3.h](/src/nanovg_gl3.h) for OpenGL 3.2 core profile.
## Drawing shapes with NanoVG
Drawing a simple shape using NanoVG consists of four steps: 1) begin a new shape, 2) define the path to draw, 3) set fill or stroke, 4) and finally fill or stroke the path.