From 3df522b4d14e4f3fb411a059fc3ebf3e10e5b915 Mon Sep 17 00:00:00 2001
From: Willem Melching <willem.melching@gmail.com>
Date: Tue, 17 Sep 2019 12:47:30 -0700
Subject: [PATCH] Add spinner source files (#812)

---
 selfdrive/common/spinner.c | 113 +++++++++++++++++++++++++++++++++++++
 selfdrive/common/spinner.h |  14 +++++
 2 files changed, 127 insertions(+)
 create mode 100644 selfdrive/common/spinner.c
 create mode 100644 selfdrive/common/spinner.h

diff --git a/selfdrive/common/spinner.c b/selfdrive/common/spinner.c
new file mode 100644
index 00000000000000..c8bfde8c7d63a0
--- /dev/null
+++ b/selfdrive/common/spinner.c
@@ -0,0 +1,113 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <math.h>
+#include <unistd.h>
+#include <assert.h>
+
+#include <GLES3/gl3.h>
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+
+#include "nanovg.h"
+#define NANOVG_GLES3_IMPLEMENTATION
+#include "nanovg_gl.h"
+#include "nanovg_gl_utils.h"
+
+#include "framebuffer.h"
+#include "spinner.h"
+
+// external resources linked in
+extern const unsigned char _binary_opensans_semibold_ttf_start[];
+extern const unsigned char _binary_opensans_semibold_ttf_end[];
+
+extern const unsigned char _binary_img_spinner_track_png_start[];
+extern const unsigned char _binary_img_spinner_track_png_end[];
+
+extern const unsigned char _binary_img_spinner_comma_png_start[];
+extern const unsigned char _binary_img_spinner_comma_png_end[];
+
+int spin(int argc, char** argv) {
+  int err;
+
+  const char* spintext = NULL;
+  if (argc == 1) {
+    spintext = argv[0];
+  } else if (argc >= 2) {
+    spintext = argv[1];
+  }
+
+  // spinner
+  int fb_w, fb_h;
+  EGLDisplay display;
+  EGLSurface surface;
+  FramebufferState *fb = framebuffer_init("spinner", 0x00001000, false,
+                     &display, &surface, &fb_w, &fb_h);
+  assert(fb);
+
+  NVGcontext *vg = nvgCreateGLES3(NVG_ANTIALIAS | NVG_STENCIL_STROKES);
+  assert(vg);
+
+  int font = nvgCreateFontMem(vg, "Bold", (unsigned char*)_binary_opensans_semibold_ttf_start, _binary_opensans_semibold_ttf_end-_binary_opensans_semibold_ttf_start, 0);
+  assert(font >= 0);
+
+  int spinner_img = nvgCreateImageMem(vg, 0, (unsigned char*)_binary_img_spinner_track_png_start, _binary_img_spinner_track_png_end - _binary_img_spinner_track_png_start);
+  assert(spinner_img >= 0);
+  int spinner_img_s = 360;
+  int spinner_img_x = ((fb_w/2)-(spinner_img_s/2));
+  int spinner_img_y = 260;
+  int spinner_img_xc = (fb_w/2);
+  int spinner_img_yc = (fb_h/2)-100;
+  int spinner_comma_img = nvgCreateImageMem(vg, 0, (unsigned char*)_binary_img_spinner_comma_png_start, _binary_img_spinner_comma_png_end - _binary_img_spinner_comma_png_start);
+  assert(spinner_comma_img >= 0);
+
+  for (int cnt = 0; ; cnt++) {
+    glClearColor(0.1, 0.1, 0.1, 1.0);
+    glClear(GL_STENCIL_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    nvgBeginFrame(vg, fb_w, fb_h, 1.0f);
+
+    // background
+    nvgBeginPath(vg);
+    NVGpaint bg = nvgLinearGradient(vg, fb_w, 0, fb_w, fb_h,
+    nvgRGBA(0, 0, 0, 175), nvgRGBA(0, 0, 0, 255));
+    nvgFillPaint(vg, bg);
+    nvgRect(vg, 0, 0, fb_w, fb_h);
+    nvgFill(vg);
+
+    // spin track
+    nvgSave(vg);
+    nvgTranslate(vg, spinner_img_xc, spinner_img_yc);
+    nvgRotate(vg, (3.75*M_PI * cnt/120.0));
+    nvgTranslate(vg, -spinner_img_xc, -spinner_img_yc);
+    NVGpaint spinner_imgPaint = nvgImagePattern(vg, spinner_img_x, spinner_img_y,
+      spinner_img_s, spinner_img_s, 0, spinner_img, 0.6f);
+    nvgBeginPath(vg);
+    nvgFillPaint(vg, spinner_imgPaint);
+    nvgRect(vg, spinner_img_x, spinner_img_y, spinner_img_s, spinner_img_s);
+    nvgFill(vg);
+    nvgRestore(vg);
+
+    // comma
+    NVGpaint comma_imgPaint = nvgImagePattern(vg, spinner_img_x, spinner_img_y,
+      spinner_img_s, spinner_img_s, 0, spinner_comma_img, 1.0f);
+    nvgBeginPath(vg);
+    nvgFillPaint(vg, comma_imgPaint);
+    nvgRect(vg, spinner_img_x, spinner_img_y, spinner_img_s, spinner_img_s);
+    nvgFill(vg);
+
+    // message
+    if (spintext) {
+      nvgTextAlign(vg, NVG_ALIGN_CENTER | NVG_ALIGN_TOP);
+      nvgFontSize(vg, 96.0f);
+      nvgText(vg, fb_w/2, (fb_h*2/3)+24, spintext, NULL);
+    }
+
+    nvgEndFrame(vg);
+    eglSwapBuffers(display, surface);
+    assert(glGetError() == GL_NO_ERROR);
+  }
+
+  return 0;
+}
diff --git a/selfdrive/common/spinner.h b/selfdrive/common/spinner.h
new file mode 100644
index 00000000000000..fd35dcc7d48c31
--- /dev/null
+++ b/selfdrive/common/spinner.h
@@ -0,0 +1,14 @@
+#ifndef COMMON_SPINNER_H
+#define COMMON_SPINNER_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int spin(int argc, char** argv);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif