wrrmz_nothing.c

#include <SDL.h>
#include <time.h>
#include <emscripten.h>

#include "SDL/SDL_opengl.h"

#include "nanovg.h"
#define NANOVG_GLES2_IMPLEMENTATION
#include "nanovg_gl.h"
#include "nanovg_gl_utils.h"

NVGcontext* vg = NULL;

SDL_Window* window;
SDL_Renderer* renderer;
float randomFloat()
{
      float r = (float)rand()/(float)RAND_MAX;
      return r;
}
void drawMush(float cx, float cy, float size)
{
    // draw the shadow
    nvgBeginPath(vg);
    nvgEllipse(vg, cx, cy+size*0.25, size*0.9, size*0.9);
    nvgFillColor(vg, nvgRGBA(0,0,0,90));
    nvgFill(vg);

    // draw the mushroom base
    // draw the main mush
    NVGpaint gloss = nvgRadialGradient(vg, cx, cy-size*0.15, size*0.1, size*0.9, nvgRGBA(163,254,193,255), nvgRGBA(32,157,185,255));
    nvgBeginPath(vg);
    nvgEllipse(vg, cx, cy, size, size);
    nvgFillPaint(vg, gloss);
    nvgFill(vg);
    // draw some circles
    for(int i=0;i<20;i++){
        nvgBeginPath(vg);
        float rs = randomFloat();
        float rx = randomFloat();
        float ry = randomFloat();
        nvgEllipse(vg, cx-size*rx+size*0.5, cy-size*ry+size*0.5, size*rs*0.2, size*rs*0.2);
        nvgFillColor(vg, nvgRGBA(255,255,255,255));
        nvgFill(vg);

    }
}
void frame()
{
    nvgBeginFrame(vg, 640,480, 1);
    // draw the background
    nvgBeginPath(vg);
    nvgRect(vg, 0,0,640,480);
    nvgFillColor(vg, nvgRGBA(165,155,102,255));
    nvgFill(vg);
    drawMush(319,200,75);

    // nvgFill(vg);


    nvgEndFrame(vg);

}

int main()
{
    srand(time(NULL));

      SDL_GLContext context;
    SDL_Init(SDL_INIT_VIDEO);
    window = SDL_CreateWindow("test", 0, 0, 640, 480, SDL_WINDOW_OPENGL);
    context = SDL_GL_CreateContext(window);

    SDL_GL_SetSwapInterval(1);
    vg = nvgCreateGLES2(NVG_ANTIALIAS | NVG_STENCIL_STROKES | NVG_DEBUG);
    emscripten_set_main_loop(frame, -1, 1);
}