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