Add forgotten demo2.c

VS: ----------------------------------------------------------------------

progs/egl/demo2.c

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+/*
+ * Exercise EGL API functions
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <GLES/egl.h>
+
+#define FRONTBUFFER
+
+static void _subset_Rectf(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2)
+{
+   glBegin( GL_QUADS );
+   glVertex2f( x1, y1 );
+   glVertex2f( x2, y1 );
+   glVertex2f( x2, y2 );
+   glVertex2f( x1, y2 );
+   glEnd();
+}
+
+
+static void redraw(EGLDisplay dpy, int rot)
+{
+   printf("Redraw event\n");
+
+#ifdef FRONTBUFFER
+    glDrawBuffer( GL_FRONT ); 
+#else
+    glDrawBuffer( GL_BACK );
+#endif
+
+   glClearColor( rand()/(float)RAND_MAX, 
+		 rand()/(float)RAND_MAX, 
+		 rand()/(float)RAND_MAX,
+		 1);
+
+   glClear( GL_COLOR_BUFFER_BIT ); 
+
+   glColor3f( rand()/(float)RAND_MAX, 
+	      rand()/(float)RAND_MAX, 
+	      rand()/(float)RAND_MAX );
+   glPushMatrix();
+   glRotatef(rot, 0, 0, 1);
+   glScalef(.5, .5, .5);
+   _subset_Rectf( -1, -1, 1, 1 );
+   glPopMatrix();
+
+#ifdef FRONTBUFFER
+   glFlush();
+#else
+   EGLSwapBuffers( dpy, w ); 
+#endif
+   glFinish();
+}
+
+
+/**
+ * Test EGL_MESA_screen_surface functions
+ */
+static void
+TestScreens(EGLDisplay dpy)
+{
+#define MAX 8
+   EGLScreenMESA screens[MAX];
+   EGLint numScreens;
+   EGLint i;
+
+   eglGetScreensMESA(dpy, screens, MAX, &numScreens);
+   printf("Found %d screens\n", numScreens);
+   for (i = 0; i < numScreens; i++) {
+      printf(" Screen %d handle: %d\n", i, (int) screens[i]);
+   }
+}
+
+
+int
+main(int argc, char *argv[])
+{
+   int maj, min;
+   EGLContext ctx;
+   EGLSurface pbuffer, screen_surf;
+   EGLConfig configs[10];
+   EGLint numConfigs, i;
+   EGLBoolean b;
+   const EGLint pbufAttribs[] = {
+      EGL_WIDTH, 500,
+      EGL_HEIGHT, 500,
+      EGL_NONE
+   };
+   const EGLint screenAttribs[] = {
+      EGL_WIDTH, 1024,
+      EGL_HEIGHT, 768,
+      EGL_NONE
+   };
+   EGLModeMESA mode;
+   EGLScreenMESA screen;
+   EGLint count;
+
+   /*
+   EGLDisplay d = eglGetDisplay(EGL_DEFAULT_DISPLAY);
+   */
+   EGLDisplay d = eglGetDisplay("!fb_dri");
+   assert(d);
+
+   if (!eglInitialize(d, &maj, &min)) {
+      printf("demo: eglInitialize failed\n");
+      exit(1);
+   }
+
+   printf("EGL version = %d.%d\n", maj, min);
+   printf("EGL_VENDOR = %s\n", eglQueryString(d, EGL_VENDOR));
+
+   eglGetConfigs(d, configs, 10, &numConfigs);
+   printf("Got %d EGL configs:\n", numConfigs);
+   for (i = 0; i < numConfigs; i++) {
+      EGLint id, red, depth;
+      eglGetConfigAttrib(d, configs[i], EGL_CONFIG_ID, &id);
+      eglGetConfigAttrib(d, configs[i], EGL_RED_SIZE, &red);
+      eglGetConfigAttrib(d, configs[i], EGL_DEPTH_SIZE, &depth);
+      printf("%2d:  Red Size = %d  Depth Size = %d\n", id, red, depth);
+   }
+   
+   eglGetScreensMESA(d, &screen, 1, &count);
+   eglGetModesMESA(d, screen, &mode, 1, &count);
+
+   ctx = eglCreateContext(d, configs[0], EGL_NO_CONTEXT, NULL);
+   if (ctx == EGL_NO_CONTEXT) {
+      printf("failed to create context\n");
+      return 0;
+   }
+
+   pbuffer = eglCreatePbufferSurface(d, configs[0], pbufAttribs);
+   if (pbuffer == EGL_NO_SURFACE) {
+      printf("failed to create pbuffer\n");
+      return 0;
+   }
+
+   b = eglMakeCurrent(d, pbuffer, pbuffer, ctx);
+   if (!b) {
+      printf("make current failed\n");
+      return 0;
+   }
+
+   b = eglMakeCurrent(d, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+
+   screen_surf = eglCreateScreenSurfaceMESA(d, configs[0], screenAttribs);
+   if (screen_surf == EGL_NO_SURFACE) {
+      printf("failed to create screen surface\n");
+      return 0;
+   }
+   
+   eglShowSurfaceMESA(d, screen, screen_surf, mode);
+
+   b = eglMakeCurrent(d, screen_surf, screen_surf, ctx);
+   if (!b) {
+      printf("make current failed\n");
+      return 0;
+   }
+
+   glViewport(0, 0, 1024, 768);
+   
+   TestScreens(d);
+
+   glShadeModel( GL_FLAT );
+   
+   for (i = 0; i < 6; i++) {
+      redraw(d, i*10 );
+
+      printf("sleep(1)\n");   
+      sleep(1);  
+   }
+
+   eglDestroySurface(d, pbuffer);
+   eglDestroyContext(d, ctx);
+   eglTerminate(d);
+
+   return 0;
+}