a somewhat nicer demo w/ command line options

progs/miniglx/miniglxtest.c

@@ -1,5 +1,3 @@
-/* $Id: miniglxtest.c,v 1.3 2004/03/25 14:58:39 brianp Exp $ */
-
 /*
  * Test the mini GLX interface.
  */
@@ -7,6 +5,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <GL/gl.h>
 #define USE_MINI_GLX 1
@@ -15,91 +14,88 @@
 #else
 #include <GL/glx.h>
 #endif
+#include "../util/writebuf.c"
 
-#define FRONTBUFFER 1
-#define NR          6
-#define DO_SLEEPS   1
-#define NR_DISPLAYS 2
+static GLXContext ctx;
 
-GLXContext ctx;
+static GLuint NumFrames = 100;
+static GLuint NumDisplays = 1;
+static GLboolean Texture = GL_FALSE;
+static GLboolean SingleBuffer = GL_FALSE;
+static GLboolean Sleeps = GL_TRUE;
 
 
-static void _subset_Rectf( GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2 )
+static void
+rect(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2)
 {
-   glBegin( GL_QUADS );
-   glVertex2f( x1, y1 );
-   glVertex2f( x2, y1 );
-   glVertex2f( x2, y2 );
-   glVertex2f( x1, y2 );
+   glBegin(GL_QUADS);
+   glTexCoord2f(0, 0);  glColor3f(0, 0, 1);  glVertex2f(x1, y1);
+   glTexCoord2f(1, 0);  glColor3f(1, 0, 0);  glVertex2f(x2, y1);
+   glTexCoord2f(1, 1);  glColor3f(0, 1, 0);  glVertex2f(x2, y2);
+   glTexCoord2f(0, 1);  glColor3f(0, 0, 0);  glVertex2f(x1, y2);
    glEnd();
 }
 
 
-
-static void redraw( Display *dpy, Window w, int rot )
+static void
+redraw(Display *dpy, Window w, int rot)
 {
-   printf("Redraw event\n");
-
-#if FRONTBUFFER
-    glDrawBuffer( GL_FRONT ); 
-#else
-/*     glDrawBuffer( GL_BACK );    */
-#endif
+   GLfloat a;
 
-   glClearColor( rand()/(float)RAND_MAX, 
-		 rand()/(float)RAND_MAX, 
-		 rand()/(float)RAND_MAX,
-		 1);
+   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
-   glClear( GL_COLOR_BUFFER_BIT ); 
-
-#if 1
-   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 );
+      glRotatef(rot, 0, 0, 1);
+      glScalef(.5, .5, .5);
+      for (a = 0.0; a < 360.0; a += 30.0) {
+         glPushMatrix();
+            glRotatef(a, 0, 0, 1);
+            glRotatef(40, 1, 0, 0);
+            glColor3f(a / 360.0, 1-a/360.0, 0);
+            rect(0.3, -0.25, 1.5, 0.25);
+         glPopMatrix();
+      }
    glPopMatrix();
-#endif
 
-#if FRONTBUFFER
-   glFlush();
-#else
-   glXSwapBuffers( dpy, w ); 
-#endif
-   glFinish();
+   if (SingleBuffer)
+      glFlush();
+   else 
+      glXSwapBuffers(dpy, w); 
 }
 
 
-static Window make_rgb_db_window( Display *dpy,
-				  unsigned int width, unsigned int height )
+static Window
+make_window(Display *dpy, unsigned int width, unsigned int height)
 {
-   int attrib[] = { GLX_RGBA,
-		    GLX_RED_SIZE, 1,
-		    GLX_GREEN_SIZE, 1,
-		    GLX_BLUE_SIZE, 1,
-#if !FRONTBUFFER
- 		    GLX_DOUBLEBUFFER, 
-#endif
-		    None };
-   int scrnum;
+   int attrib_single[] = { GLX_RGBA,
+                           GLX_RED_SIZE, 1,
+                           GLX_GREEN_SIZE, 1,
+                           GLX_BLUE_SIZE, 1,
+                           GLX_DEPTH_SIZE, 1,
+                           None };
+   int attrib_double[] = { GLX_RGBA,
+                           GLX_RED_SIZE, 1,
+                           GLX_GREEN_SIZE, 1,
+                           GLX_BLUE_SIZE, 1,
+                           GLX_DEPTH_SIZE, 1,
+                           GLX_DOUBLEBUFFER, 
+                           None };
+   int *attrib = SingleBuffer ? attrib_single : attrib_double;
+   int scrnum = 0;
    XSetWindowAttributes attr;
    unsigned long mask;
    Window root;
    Window win;
    XVisualInfo *visinfo;
 
-   scrnum = 0;
-   root = RootWindow( dpy, scrnum );
+   root = RootWindow(dpy, scrnum);
 
-   if (!(visinfo = glXChooseVisual( dpy, scrnum, attrib ))) {
+   if (!(visinfo = glXChooseVisual(dpy, scrnum, attrib))) {
       printf("Error: couldn't get an RGB, Double-buffered visual\n");
       exit(1);
    }
 
-   if(!(ctx = glXCreateContext( dpy, visinfo, NULL, True ))) {
+   if (!(ctx = glXCreateContext(dpy, visinfo, NULL, True))) {
       printf("Error: glXCreateContext failed\n");
       exit(1);
    }
@@ -107,19 +103,19 @@ static Window make_rgb_db_window( Display *dpy,
    /* window attributes */
    attr.background_pixel = 0;
    attr.border_pixel = 0;
-   attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone);
+   attr.colormap = XCreateColormap(dpy, root, visinfo->visual, AllocNone);
    attr.event_mask = StructureNotifyMask | ExposureMask;
    mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
 
-   win = XCreateWindow( dpy, root, 0, 0, width, height,
+   win = XCreateWindow(dpy, root, 0, 0, width, height,
 		        0, visinfo->depth, InputOutput,
-		        visinfo->visual, mask, &attr );
+		        visinfo->visual, mask, &attr);
    if (!win) {
       printf("Error: XCreateWindow failed\n");
       exit(1);
    }
 
-   glXMakeCurrent( dpy, win, ctx );
+   glXMakeCurrent(dpy, win, ctx);
 
    glViewport(0, 0, width, height);
 
@@ -127,22 +123,28 @@ static Window make_rgb_db_window( Display *dpy,
 }
 
 
-static void event_loop( Display *dpy, Window win )
+static void
+event_loop(Display *dpy, Window win)
 {
    int i;
 
-   printf("Hang on... drawing %d frames\n", NR);
-   for (i = 0; i < NR; i++) {
-      redraw( dpy, win, i*10 );
-      if (DO_SLEEPS) {
-	 printf("sleep(1)\n");   
-	 sleep(1);  
+   printf("Drawing %d frames\n", NumFrames);
+
+   for (i = 0; i < NumFrames; i++) {
+      redraw(dpy, win, -i*2);
+      if (i == 1) {
+         glReadBuffer(GL_BACK);
+         WritePPMFile("frame1.ppm", 800,600);
+      }
+      if (Sleeps) {
+         usleep(20000);
       }
    }
 }
 
 
-static int foo( void )
+static int
+runtest(void)
 {
    Display *dpy;
    Window win;
@@ -153,41 +155,121 @@ static int foo( void )
       return 1;
    }
 
-   win = make_rgb_db_window( dpy, 800, 600);
+   win = make_window(dpy, 800, 600);
 
    srand(getpid());
 
-   glShadeModel( GL_FLAT );
-   glClearColor( 0.5, 0.5, 0.5, 1.0 );
+   /* init GL state */
+   glClearColor(0.5, 0.5, 0.5, 1.0);
+   glEnable(GL_DEPTH_TEST);
+   if (Texture) {
+      GLubyte image[16][16][4];
+      GLint i, j;
+      for (i = 0; i < 16; i++) {
+         for (j = 0; j < 16; j++) {
+            if (((i / 2) ^ (j / 2)) & 1) {
+               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] = 128;
+               image[i][j][1] = 128;
+               image[i][j][2] = 128;
+               image[i][j][3] = 128;
+            }
+         }
+      }
+      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 16, 16, 0,
+                   GL_RGBA, GL_UNSIGNED_BYTE, image);
+      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+      glEnable(GL_TEXTURE_2D);
+   }
+   if (SingleBuffer) {
+      glDrawBuffer(GL_FRONT); 
+      glReadBuffer(GL_FRONT); 
+   }
+   else {
+      glDrawBuffer(GL_BACK);
+   }
 
-   XMapWindow( dpy, win );
+   XMapWindow(dpy, win);
 
+   /* wait for window to get mapped */
    {
       XEvent e;
       while (1) {
-	 XNextEvent( dpy, &e );
+	 XNextEvent(dpy, &e);
 	 if (e.type == MapNotify && e.xmap.window == win) {
 	    break;
 	 }
       }
    }
 
-   event_loop( dpy, win );
+   event_loop(dpy, win);
 
-   glXDestroyContext( dpy, ctx );
-   XDestroyWindow( dpy, win );
+   glXDestroyContext(dpy, ctx);
+   XDestroyWindow(dpy, win);
 
-   XCloseDisplay( dpy );
+   XCloseDisplay(dpy);
 
    return 0;
 }
 
 
-int main()
+static void
+usage(void)
+{
+   printf("Usage:\n");
+   printf("  -f N   render N frames (default %d)\n", NumFrames);
+   printf("  -d N   do N display cycles\n");
+   printf("  -t     texturing\n");
+   printf("  -s     single buffering\n");
+   printf("  -n     no usleep() delay\n");
+}
+
+
+static void
+parse_args(int argc, char *argv[])
 {
    int i;
-   for (i = 0 ; i < NR_DISPLAYS ; i++) {
-      if (foo() != 0)
+   for (i = 1; i < argc; i++) {
+      if (strcmp(argv[i], "-f") == 0) {
+         NumFrames = atoi(argv[i + 1]);
+         i++;
+      }
+      else if (strcmp(argv[i], "-d") == 0) {
+         NumDisplays = atoi(argv[i + 1]);
+         i++;
+      }
+      else if (strcmp(argv[i], "-n") == 0) {
+         Sleeps = GL_FALSE;
+      }
+      else if (strcmp(argv[i], "-s") == 0) {
+         SingleBuffer = GL_TRUE;
+      }
+      else if (strcmp(argv[i], "-t") == 0) {
+         Texture = GL_TRUE;
+      }
+      else {
+         usage();
+         exit(1);
+      }
+   }
+}
+
+
+int
+main(int argc, char *argv[])
+{
+   int i;
+
+   parse_args(argc, argv);
+
+   for (i = 0; i < NumDisplays; i++) {
+      if (runtest() != 0)
 	 break;
    }