progs/es: OpenGL ES 1.x and 2.X demo programs.

The demo programs are written by Brian Paul, and cherry-picked from
opengl-es branch.  Several minor issues such as a linking problem are
fixed.

Signed-off-by: Chia-I Wu <[email protected]>

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;
+}