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-rw-r--r--progs/openvg/demos/gears.c394
1 files changed, 394 insertions, 0 deletions
diff --git a/progs/openvg/demos/gears.c b/progs/openvg/demos/gears.c
new file mode 100644
index 0000000000..7dcb3954a8
--- /dev/null
+++ b/progs/openvg/demos/gears.c
@@ -0,0 +1,394 @@
+#include <assert.h>
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/keysym.h>
+#include <VG/openvg.h>
+#include <GLES/egl.h>
+
+static VGint width, height;
+static VGPath gear1;
+static VGPath gear2;
+static VGPath gear3;
+
+static VGPaint fill;
+const VGfloat color[4] = {0.5, 0.5, 0.5, 1.0};
+
+static VGfloat gear1_angle = 35;
+static VGfloat gear2_angle = 24;
+static VGfloat gear3_angle = 33.5;
+
+static void moveTo(VGPath path, VGfloat x, VGfloat y)
+{
+ static VGubyte moveTo = VG_MOVE_TO | VG_ABSOLUTE;
+ VGfloat pathData[2];
+ pathData[0] = x; pathData[1] = y;
+ vgAppendPathData(path, 1, &moveTo, pathData);
+}
+
+static void lineTo(VGPath path, VGfloat x, VGfloat y)
+{
+ static VGubyte lineTo = VG_LINE_TO | VG_ABSOLUTE;
+ VGfloat pathData[2];
+ pathData[0] = x; pathData[1] = y;
+ vgAppendPathData(path, 1, &lineTo, pathData);
+}
+
+static void closeSubpath(VGPath path)
+{
+ static VGubyte close = VG_CLOSE_PATH | VG_ABSOLUTE;
+ VGfloat pathData[2];
+ vgAppendPathData(path, 1, &close, pathData);
+}
+
+static void cubicTo(VGPath path, VGfloat x1, VGfloat y1, VGfloat x2, VGfloat y2,
+ VGfloat midx, VGfloat midy)
+{
+ static VGubyte cubic = VG_CUBIC_TO | VG_ABSOLUTE;
+ VGfloat pathData[6];
+ pathData[0] = x1;
+ pathData[1] = y1;
+ pathData[2] = x2;
+ pathData[3] = y2;
+ pathData[4] = midx;
+ pathData[5] = midy;
+ vgAppendPathData(path, 1, &cubic, pathData);
+}
+
+static VGPath gearsPath(double inner_radius, double outer_radius,
+ int teeth, double tooth_depth)
+{
+ VGPath path = vgCreatePath(VG_PATH_FORMAT_STANDARD, VG_PATH_DATATYPE_F, 1.0f, 0.0f,
+ 0, 0, (unsigned int)VG_PATH_CAPABILITY_ALL);
+
+ int i;
+ double r0, r1, r2;
+ double angle, da;
+
+ r0 = inner_radius;
+ r1 = outer_radius - tooth_depth / 2.0;
+ r2 = outer_radius + tooth_depth / 2.0;
+
+ da = 2.0 * M_PI / (VGfloat) teeth / 4.0;
+
+ angle = 0.0;
+ moveTo(path, r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da));
+
+ for (i = 1; i <= teeth; i++) {
+ angle = i * 2.0 * M_PI / (VGfloat)teeth;
+
+ lineTo(path, r1 * cos(angle), r1 * sin(angle));
+ lineTo(path, r2 * cos(angle + da), r2 * sin(angle + da));
+ lineTo(path, r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da));
+
+ if (i < teeth)
+ lineTo(path, r1 * cos(angle + 3 * da),
+ r1 * sin(angle + 3 * da));
+ }
+
+ closeSubpath(path);
+
+ moveTo(path, r0 * cos(angle + 3 * da), r0 * sin(angle + 3 * da));
+
+ for (i = 1; i <= teeth; i++) {
+ angle = i * 2.0 * M_PI / (VGfloat) teeth;
+
+ lineTo(path, r0 * cos(angle), r0 * sin(angle));
+ }
+
+ closeSubpath(path);
+ return path;
+}
+
+static void
+draw(void)
+{
+ vgClear(0, 0, width, height);
+
+ vgSeti(VG_MATRIX_MODE, VG_MATRIX_PATH_USER_TO_SURFACE);
+
+ vgLoadIdentity();
+ vgLoadIdentity();
+ vgTranslate(170, 330);
+ vgRotate(gear1_angle);
+ vgDrawPath(gear1, VG_FILL_PATH);
+
+ vgLoadIdentity();
+ vgTranslate(369, 330);
+ vgRotate(gear2_angle);
+ vgDrawPath(gear2, VG_FILL_PATH);
+
+ vgLoadIdentity();
+ vgTranslate(170, 116);
+ vgRotate(gear3_angle);
+ vgDrawPath(gear3, VG_FILL_PATH);
+
+ gear1_angle += 1;
+ gear2_angle -= (20.0 / 12.0);
+ gear3_angle -= (20.0 / 14.0);
+}
+
+
+/* new window size or exposure */
+static void
+reshape(int w, int h)
+{
+ width = w;
+ height = h;
+}
+
+
+static void
+init(void)
+{
+ float clear_color[4] = {1.0, 1.0, 1.0, 1.0};
+ vgSetfv(VG_CLEAR_COLOR, 4, clear_color);
+
+ gear1 = gearsPath(30.0, 120.0, 20, 20.0);
+ gear2 = gearsPath(15.0, 75.0, 12, 20.0);
+ gear3 = gearsPath(20.0, 90.0, 14, 20.0);
+
+ fill = vgCreatePaint();
+ vgSetParameterfv(fill, VG_PAINT_COLOR, 4, color);
+ vgSetPaint(fill, VG_FILL_PATH);
+}
+
+
+/*
+ * Create an RGB, double-buffered X window.
+ * Return the window and context handles.
+ */
+static void
+make_x_window(Display *x_dpy, EGLDisplay egl_dpy,
+ const char *name,
+ int x, int y, int width, int height,
+ Window *winRet,
+ EGLContext *ctxRet,
+ EGLSurface *surfRet)
+{
+ static const EGLint attribs[] = {
+ EGL_RED_SIZE, 1,
+ EGL_GREEN_SIZE, 1,
+ EGL_BLUE_SIZE, 1,
+ EGL_NONE
+ };
+
+ int scrnum;
+ XSetWindowAttributes attr;
+ unsigned long mask;
+ Window root;
+ Window win;
+ XVisualInfo *visInfo, visTemplate;
+ int num_visuals;
+ EGLContext ctx;
+ EGLConfig config;
+ EGLint num_configs;
+ EGLint vid;
+
+ scrnum = DefaultScreen( x_dpy );
+ root = RootWindow( x_dpy, scrnum );
+
+ if (!eglChooseConfig( egl_dpy, attribs, &config, 1, &num_configs)) {
+ printf("Error: couldn't get an EGL visual config\n");
+ exit(1);
+ }
+
+ assert(config);
+ assert(num_configs > 0);
+
+ if (!eglGetConfigAttrib(egl_dpy, config, EGL_NATIVE_VISUAL_ID, &vid)) {
+ printf("Error: eglGetConfigAttrib() failed\n");
+ exit(1);
+ }
+
+ /* The X window visual must match the EGL config */
+ visTemplate.visualid = vid;
+ visInfo = XGetVisualInfo(x_dpy, VisualIDMask, &visTemplate, &num_visuals);
+ if (!visInfo) {
+ printf("Error: couldn't get X visual\n");
+ exit(1);
+ }
+
+ /* window attributes */
+ attr.background_pixel = 0;
+ attr.border_pixel = 0;
+ attr.colormap = XCreateColormap( x_dpy, root, visInfo->visual, AllocNone);
+ attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
+ mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
+
+ win = XCreateWindow( x_dpy, root, 0, 0, width, height,
+ 0, visInfo->depth, InputOutput,
+ visInfo->visual, mask, &attr );
+
+ /* set hints and properties */
+ {
+ XSizeHints sizehints;
+ sizehints.x = x;
+ sizehints.y = y;
+ sizehints.width = width;
+ sizehints.height = height;
+ sizehints.flags = USSize | USPosition;
+ XSetNormalHints(x_dpy, win, &sizehints);
+ XSetStandardProperties(x_dpy, win, name, name,
+ None, (char **)NULL, 0, &sizehints);
+ }
+
+ eglBindAPI(EGL_OPENVG_API);
+
+ ctx = eglCreateContext(egl_dpy, config, EGL_NO_CONTEXT, NULL );
+ if (!ctx) {
+ printf("Error: eglCreateContext failed\n");
+ exit(1);
+ }
+
+ *surfRet = eglCreateWindowSurface(egl_dpy, config, win, NULL);
+
+ if (!*surfRet) {
+ printf("Error: eglCreateWindowSurface failed\n");
+ exit(1);
+ }
+
+ XFree(visInfo);
+
+ *winRet = win;
+ *ctxRet = ctx;
+}
+
+
+static void
+event_loop(Display *dpy, Window win,
+ EGLDisplay egl_dpy, EGLSurface egl_surf)
+{
+ while (1) {
+ XEvent event;
+
+ while (XPending(dpy) > 0) {
+ XNextEvent(dpy, &event);
+
+ switch (event.type) {
+ case Expose:
+ break;
+ case ConfigureNotify:
+ reshape(event.xconfigure.width, event.xconfigure.height);
+ break;
+ case KeyPress:
+ {
+ char buffer[10];
+ int r, code;
+ code = XLookupKeysym(&event.xkey, 0);
+ r = XLookupString(&event.xkey, buffer, sizeof(buffer),
+ NULL, NULL);
+ if (buffer[0] == 27) {
+ /* escape */
+ return;
+ }
+ }
+ break;
+ default:
+ ; /*no-op*/
+ }
+ }
+
+ draw();
+ eglSwapBuffers(egl_dpy, egl_surf);
+ }
+}
+
+
+static void
+usage(void)
+{
+ printf("Usage:\n");
+ printf(" -display <displayname> set the display to run on\n");
+ printf(" -info display OpenGL renderer info\n");
+}
+
+int
+main(int argc, char *argv[])
+{
+ const int winWidth = 500, winHeight = 500;
+ Display *x_dpy;
+ Window win;
+ EGLSurface egl_surf;
+ EGLContext egl_ctx;
+ EGLDisplay egl_dpy;
+ char *dpyName = NULL;
+ GLboolean printInfo = GL_FALSE;
+ EGLint egl_major, egl_minor;
+ int i;
+ const char *s;
+
+ for (i = 1; i < argc; i++) {
+ if (strcmp(argv[i], "-display") == 0) {
+ dpyName = argv[i+1];
+ i++;
+ }
+ else if (strcmp(argv[i], "-info") == 0) {
+ printInfo = GL_TRUE;
+ }
+ else {
+ usage();
+ return -1;
+ }
+ }
+
+ x_dpy = XOpenDisplay(dpyName);
+ if (!x_dpy) {
+ printf("Error: couldn't open display %s\n",
+ dpyName ? dpyName : getenv("DISPLAY"));
+ return -1;
+ }
+
+ egl_dpy = eglGetDisplay(x_dpy);
+ if (!egl_dpy) {
+ printf("Error: eglGetDisplay() failed\n");
+ return -1;
+ }
+
+ if (!eglInitialize(egl_dpy, &egl_major, &egl_minor)) {
+ printf("Error: eglInitialize() failed\n");
+ return -1;
+ }
+
+ s = eglQueryString(egl_dpy, EGL_VERSION);
+ printf("EGL_VERSION = %s\n", s);
+
+ make_x_window(x_dpy, egl_dpy,
+ "xegl_tri", 0, 0, winWidth, winHeight,
+ &win, &egl_ctx, &egl_surf);
+
+ XMapWindow(x_dpy, win);
+ if (!eglMakeCurrent(egl_dpy, egl_surf, egl_surf, egl_ctx)) {
+ printf("Error: eglMakeCurrent() failed\n");
+ return -1;
+ }
+
+ if (printInfo) {
+ printf("VG_RENDERER = %s\n", (char *) vgGetString(VG_RENDERER));
+ printf("VG_VERSION = %s\n", (char *) vgGetString(VG_VERSION));
+ printf("VG_VENDOR = %s\n", (char *) vgGetString(VG_VENDOR));
+ }
+
+ init();
+
+ /* Set initial projection/viewing transformation.
+ * We can't be sure we'll get a ConfigureNotify event when the window
+ * first appears.
+ */
+ reshape(winWidth, winHeight);
+
+ event_loop(x_dpy, win, egl_dpy, egl_surf);
+
+ eglDestroyContext(egl_dpy, egl_ctx);
+ eglDestroySurface(egl_dpy, egl_surf);
+ eglTerminate(egl_dpy);
+
+
+ XDestroyWindow(x_dpy, win);
+ XCloseDisplay(x_dpy);
+
+ return 0;
+}
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