diff options
Diffstat (limited to 'progs/es1/xegl/torus.c')
| -rw-r--r-- | progs/es1/xegl/torus.c | 509 |
1 files changed, 509 insertions, 0 deletions
diff --git a/progs/es1/xegl/torus.c b/progs/es1/xegl/torus.c new file mode 100644 index 00000000000..634d12641c7 --- /dev/null +++ b/progs/es1/xegl/torus.c @@ -0,0 +1,509 @@ +/* + * Copyright (C) 2008 Tunsgten Graphics,Inc. All Rights Reserved. + */ + +/* + * Draw a lit, textured torus with X/EGL and OpenGL ES 1.x + * Brian Paul + * July 2008 + */ + + +#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 <GLES/gl.h> +#include <GLES/glext.h> +#include <EGL/egl.h> + + + + +static GLfloat view_rotx = 0.0, view_roty = 0.0, view_rotz = 0.0; + + +static void +Normal(GLfloat *n, GLfloat nx, GLfloat ny, GLfloat nz) +{ + n[0] = nx; + n[1] = ny; + n[2] = nz; +} + +static void +Vertex(GLfloat *v, GLfloat vx, GLfloat vy, GLfloat vz) +{ + v[0] = vx; + v[1] = vy; + v[2] = vz; +} + +static void +Texcoord(GLfloat *v, GLfloat s, GLfloat t) +{ + v[0] = s; + v[1] = t; +} + + +/* Borrowed from glut, adapted */ +static void +draw_torus(GLfloat r, GLfloat R, GLint nsides, GLint rings) +{ + int i, j; + GLfloat theta, phi, theta1; + GLfloat cosTheta, sinTheta; + GLfloat cosTheta1, sinTheta1; + GLfloat ringDelta, sideDelta; + GLfloat varray[100][3], narray[100][3], tarray[100][2]; + int vcount; + + glVertexPointer(3, GL_FLOAT, 0, varray); + glNormalPointer(GL_FLOAT, 0, narray); + glTexCoordPointer(2, GL_FLOAT, 0, tarray); + glEnableClientState(GL_VERTEX_ARRAY); + glEnableClientState(GL_NORMAL_ARRAY); + glEnableClientState(GL_TEXTURE_COORD_ARRAY); + + ringDelta = 2.0 * M_PI / rings; + sideDelta = 2.0 * M_PI / nsides; + + theta = 0.0; + cosTheta = 1.0; + sinTheta = 0.0; + for (i = rings - 1; i >= 0; i--) { + theta1 = theta + ringDelta; + cosTheta1 = cos(theta1); + sinTheta1 = sin(theta1); + + vcount = 0; /* glBegin(GL_QUAD_STRIP); */ + + phi = 0.0; + for (j = nsides; j >= 0; j--) { + GLfloat s0, s1, t; + GLfloat cosPhi, sinPhi, dist; + + phi += sideDelta; + cosPhi = cos(phi); + sinPhi = sin(phi); + dist = R + r * cosPhi; + + s0 = 20.0 * theta / (2.0 * M_PI); + s1 = 20.0 * theta1 / (2.0 * M_PI); + t = 8.0 * phi / (2.0 * M_PI); + + Normal(narray[vcount], cosTheta1 * cosPhi, -sinTheta1 * cosPhi, sinPhi); + Texcoord(tarray[vcount], s1, t); + Vertex(varray[vcount], cosTheta1 * dist, -sinTheta1 * dist, r * sinPhi); + vcount++; + + Normal(narray[vcount], cosTheta * cosPhi, -sinTheta * cosPhi, sinPhi); + Texcoord(tarray[vcount], s0, t); + Vertex(varray[vcount], cosTheta * dist, -sinTheta * dist, r * sinPhi); + vcount++; + } + + /*glEnd();*/ + assert(vcount <= 100); + glDrawArrays(GL_TRIANGLE_STRIP, 0, vcount); + + theta = theta1; + cosTheta = cosTheta1; + sinTheta = sinTheta1; + } + + glDisableClientState(GL_VERTEX_ARRAY); + glDisableClientState(GL_NORMAL_ARRAY); + glDisableClientState(GL_TEXTURE_COORD_ARRAY); +} + + +static void +draw(void) +{ + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + + glPushMatrix(); + glRotatef(view_rotx, 1, 0, 0); + glRotatef(view_roty, 0, 1, 0); + glRotatef(view_rotz, 0, 0, 1); + glScalef(0.5, 0.5, 0.5); + + draw_torus(1.0, 3.0, 30, 60); + + glPopMatrix(); +} + + +/* new window size or exposure */ +static void +reshape(int width, int height) +{ + GLfloat ar = (GLfloat) width / (GLfloat) height; + + glViewport(0, 0, (GLint) width, (GLint) height); + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + +#ifdef GL_VERSION_ES_CM_1_0 + glFrustumf(-ar, ar, -1, 1, 5.0, 60.0); +#else + glFrustum(-ar, ar, -1, 1, 5.0, 60.0); +#endif + + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + glTranslatef(0.0, 0.0, -15.0); +} + + +static void +make_texture(void) +{ +#define SZ 64 + GLenum Filter = GL_LINEAR; + GLubyte image[SZ][SZ][4]; + GLuint i, j; + + for (i = 0; i < SZ; i++) { + for (j = 0; j < SZ; j++) { + GLfloat d = (i - SZ/2) * (i - SZ/2) + (j - SZ/2) * (j - SZ/2); + d = sqrt(d); + if (d < SZ/3) { + image[i][j][0] = 255; + image[i][j][1] = 255; + image[i][j][2] = 255; + image[i][j][3] = 255; + } + else { + image[i][j][0] = 127; + image[i][j][1] = 127; + image[i][j][2] = 127; + image[i][j][3] = 255; + } + } + } + + glActiveTexture(GL_TEXTURE0); /* unit 0 */ + glBindTexture(GL_TEXTURE_2D, 42); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, SZ, SZ, 0, + GL_RGBA, GL_UNSIGNED_BYTE, image); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, Filter); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, Filter); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); +#undef SZ +} + + + +static void +init(void) +{ + static const GLfloat red[4] = {1, 0, 0, 0}; + static const GLfloat white[4] = {1.0, 1.0, 1.0, 1.0}; + static const GLfloat diffuse[4] = {0.7, 0.7, 0.7, 1.0}; + static const GLfloat specular[4] = {0.001, 0.001, 0.001, 1.0}; + static const GLfloat pos[4] = {20, 20, 50, 1}; + + glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); + glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, white); + glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 9.0); + + glEnable(GL_LIGHTING); + glEnable(GL_LIGHT0); + glLightfv(GL_LIGHT0, GL_POSITION, pos); + glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse); + glLightfv(GL_LIGHT0, GL_SPECULAR, specular); + + glClearColor(0.4, 0.4, 0.4, 0.0); + glEnable(GL_DEPTH_TEST); + + make_texture(); + glEnable(GL_TEXTURE_2D); +} + + +/* + * 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_DEPTH_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_OPENGL_ES_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) +{ + int anim = 1; + + while (1) { + int redraw = 0; + + if (!anim || XPending(dpy)) { + XEvent event; + XNextEvent(dpy, &event); + + switch (event.type) { + case Expose: + redraw = 1; + break; + case ConfigureNotify: + reshape(event.xconfigure.width, event.xconfigure.height); + break; + case KeyPress: + { + char buffer[10]; + int r, code; + code = XLookupKeysym(&event.xkey, 0); + if (code == XK_Left) { + view_roty += 5.0; + } + else if (code == XK_Right) { + view_roty -= 5.0; + } + else if (code == XK_Up) { + view_rotx += 5.0; + } + else if (code == XK_Down) { + view_rotx -= 5.0; + } + else { + r = XLookupString(&event.xkey, buffer, sizeof(buffer), + NULL, NULL); + if (buffer[0] == ' ') { + anim = !anim; + } + else if (buffer[0] == 27) { + /* escape */ + return; + } + } + } + redraw = 1; + break; + default: + ; /*no-op*/ + } + } + + if (anim) { + view_rotx += 1.0; + view_roty += 2.0; + redraw = 1; + } + + if (redraw) { + 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 = 300, winHeight = 300; + 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); + + s = eglQueryString(egl_dpy, EGL_VENDOR); + printf("EGL_VENDOR = %s\n", s); + + s = eglQueryString(egl_dpy, EGL_EXTENSIONS); + printf("EGL_EXTENSIONS = %s\n", s); + + s = eglQueryString(egl_dpy, EGL_CLIENT_APIS); + printf("EGL_CLIENT_APIS = %s\n", s); + + make_x_window(x_dpy, egl_dpy, + "torus", 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("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); + printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION)); + printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR)); + printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS)); + } + + 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; +} |