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77 lines
1.9 KiB
77 lines
1.9 KiB
#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <math.h>
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#include <unistd.h>
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#include <assert.h>
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#include <GLES3/gl3.h>
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#include <EGL/eglext.h>
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#include "nanovg.h"
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#define NANOVG_GLES3_IMPLEMENTATION
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#include "nanovg_gl.h"
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#include "nanovg_gl_utils.h"
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#include "common/framebuffer.h"
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int main(int argc, char** argv) {
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int err;
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const char* spintext = NULL;
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if (argc >= 2) {
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spintext = argv[1];
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}
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// spinner
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int fb_w, fb_h;
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EGLDisplay display;
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EGLSurface surface;
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FramebufferState *fb = framebuffer_init("spinner", 0x00001000, false,
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&display, &surface, &fb_w, &fb_h);
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assert(fb);
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NVGcontext *vg = nvgCreateGLES3(NVG_ANTIALIAS | NVG_STENCIL_STROKES);
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assert(vg);
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int font = nvgCreateFont(vg, "Bold", "../../assets/courbd.ttf");
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assert(font >= 0);
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for (int cnt = 0; ; cnt++) {
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glClearColor(0.1, 0.1, 0.1, 1.0);
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glClear(GL_STENCIL_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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nvgBeginFrame(vg, fb_w, fb_h, 1.0f);
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for (int k=0; k<3; k++) {
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float ang = (2*M_PI * (float)cnt / 120.0) + (k / 3.0) * 2*M_PI;
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nvgBeginPath(vg);
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nvgStrokeColor(vg, nvgRGBA(255, 255, 255, 255));
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nvgStrokeWidth(vg, 5);
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nvgMoveTo(vg, fb_w/2 + 50 * cosf(ang), fb_h/2 + 50 * sinf(ang));
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nvgLineTo(vg, fb_w/2 + 15 * cosf(ang), fb_h/2 + 15 * sinf(ang));
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nvgMoveTo(vg, fb_w/2 - 15 * cosf(ang), fb_h/2 - 15 * sinf(ang));
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nvgLineTo(vg, fb_w/2 - 50 * cosf(ang), fb_h/2 - 50 * sinf(ang));
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nvgStroke(vg);
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}
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if (spintext) {
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nvgTextAlign(vg, NVG_ALIGN_CENTER | NVG_ALIGN_TOP);
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nvgFontSize(vg, 96.0f);
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nvgText(vg, fb_w / 2, fb_h*2/3, spintext, NULL);
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}
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nvgEndFrame(vg);
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eglSwapBuffers(display, surface);
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assert(glGetError() == GL_NO_ERROR);
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}
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return 0;
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}
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