--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/testdyngles.c	Sat Oct 04 06:46:59 2008 +0000
@@ -0,0 +1,213 @@
+/*
+ * Small SDL example to demonstrate dynamically loading 
+ * OpenGL lib and functions
+ *
+ * (FYI it was supposed to look like snow in the wind or something...)
+ *
+ * Compile with :
+ * gcc testdyngl.c `sdl-config --libs --cflags` -o testdyngl -DHAVE_OPENGL
+ *
+ * You can specify a different OpenGL lib on the command line, i.e. :
+ * ./testdyngl  /usr/X11R6/lib/libGL.so.1.2
+ * or
+ * ./testdyngl  /usr/lib/libGL.so.1.0.4496
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "SDL.h"
+
+#ifdef __IPHONEOS__
+#define HAVE_OPENGLES
+#endif
+
+#ifdef HAVE_OPENGLES
+
+#include "SDL_opengles.h"
+
+/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
+static void
+quit(int rc)
+{
+    SDL_Quit();
+    exit(rc);
+}
+
+void *
+get_funcaddr(const char *p)
+{
+    void *f = SDL_GL_GetProcAddress(p);
+    if (f) {
+        return f;
+    } else {
+        printf("Unable to get function pointer for %s\n", p);
+        quit(1);
+    }
+    return NULL;
+}
+
+typedef struct
+{
+    //void (APIENTRY * glBegin) (GLenum);
+    //void (APIENTRY * glEnd) ();
+    //void (APIENTRY * glVertex3f) (GLfloat, GLfloat, GLfloat);
+
+    void (APIENTRY * glEnableClientState) (GLenum array);
+    void (APIENTRY * glVertexPointer) (GLint size, GLenum type,
+                                       GLsizei stride,
+                                       const GLvoid * pointer);
+    void (APIENTRY * glDrawArrays) (GLenum mode, GLint first, GLsizei count);
+
+
+    void (APIENTRY * glClearColor) (GLfloat, GLfloat, GLfloat, GLfloat);
+    void (APIENTRY * glClear) (GLbitfield);
+    void (APIENTRY * glDisable) (GLenum);
+    void (APIENTRY * glEnable) (GLenum);
+    void (APIENTRY * glColor4ub) (GLubyte, GLubyte, GLubyte, GLubyte);
+    void (APIENTRY * glPointSize) (GLfloat);
+    void (APIENTRY * glHint) (GLenum, GLenum);
+    void (APIENTRY * glBlendFunc) (GLenum, GLenum);
+    void (APIENTRY * glMatrixMode) (GLenum);
+    void (APIENTRY * glLoadIdentity) ();
+    void (APIENTRY * glOrthof) (GLfloat, GLfloat, GLfloat, GLfloat,
+                                GLfloat, GLfloat);
+    void (APIENTRY * glRotatef) (GLfloat, GLfloat, GLfloat, GLfloat);
+    void (APIENTRY * glViewport) (GLint, GLint, GLsizei, GLsizei);
+    void (APIENTRY * glFogf) (GLenum, GLfloat);
+}
+glfuncs;
+
+void
+init_glfuncs(glfuncs * f)
+{
+    f->glEnableClientState = get_funcaddr("glEnableClientState");
+    f->glVertexPointer = get_funcaddr("glVertexPointer");
+    f->glDrawArrays = get_funcaddr("glDrawArrays");
+    f->glClearColor = get_funcaddr("glClearColor");
+    f->glClear = get_funcaddr("glClear");
+    f->glDisable = get_funcaddr("glDisable");
+    f->glEnable = get_funcaddr("glEnable");
+    f->glColor4ub = get_funcaddr("glColor4ub");
+    f->glPointSize = get_funcaddr("glPointSize");
+    f->glHint = get_funcaddr("glHint");
+    f->glBlendFunc = get_funcaddr("glBlendFunc");
+    f->glMatrixMode = get_funcaddr("glMatrixMode");
+    f->glLoadIdentity = get_funcaddr("glLoadIdentity");
+    f->glOrthof = get_funcaddr("glOrthof");
+    f->glRotatef = get_funcaddr("glRotatef");
+    f->glViewport = get_funcaddr("glViewport");
+    f->glFogf = get_funcaddr("glFogf");
+}
+
+#define NB_PIXELS 1000
+
+int
+main(int argc, char *argv[])
+{
+    glfuncs f;
+    int i;
+    SDL_Event event;
+    int done = 0;
+    GLfloat pixels[NB_PIXELS * 3];
+    const char *gl_library = NULL;      /* Use the default GL library */
+
+    int video_w, video_h;
+
+    /* you may want to change these according to the platform */
+    video_w = 320;
+    video_h = 480;
+
+    if (argv[1]) {
+        gl_library = argv[1];
+    }
+
+    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+        printf("Unable to init SDL : %s\n", SDL_GetError());
+        return (1);
+    }
+
+    if (SDL_GL_LoadLibrary(gl_library) < 0) {
+        printf("Unable to dynamically open GL lib : %s\n", SDL_GetError());
+        quit(1);
+    }
+
+    if (SDL_SetVideoMode(video_h, video_w, 0, SDL_OPENGL) == NULL) {
+        printf("Unable to open video mode : %s\n", SDL_GetError());
+        quit(1);
+    }
+
+    /* Set the window manager title bar */
+    SDL_WM_SetCaption("SDL Dynamic OpenGL Loading Test", "testdyngl");
+
+    init_glfuncs(&f);
+
+    for (i = 0; i < NB_PIXELS; i++) {
+        pixels[3 * i] = rand() % 250 - 125;
+        pixels[3 * i + 1] = rand() % 250 - 125;
+        pixels[3 * i + 2] = rand() % 250 - 125;
+    }
+
+    f.glViewport(0, 0, video_w, video_h);
+
+    f.glMatrixMode(GL_PROJECTION);
+    f.glLoadIdentity();
+    f.glOrthof(-100, 100, -100, 100, -500, 500);
+
+    f.glMatrixMode(GL_MODELVIEW);
+    f.glLoadIdentity();
+
+    f.glEnable(GL_DEPTH_TEST);
+    f.glDisable(GL_TEXTURE_2D);
+    f.glEnable(GL_BLEND);
+    f.glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+    f.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+    f.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    f.glEnable(GL_POINT_SMOOTH);
+    f.glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
+    f.glPointSize(5.0f);
+    f.glEnable(GL_FOG);
+    f.glFogf(GL_FOG_START, -500);
+    f.glFogf(GL_FOG_END, 500);
+    f.glFogf(GL_FOG_DENSITY, 0.005);
+
+    do {
+        f.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+        f.glRotatef(2.0, 1.0, 1.0, 1.0);
+        f.glRotatef(1.0, 0.0, 1.0, 1.0);
+
+        f.glColor4ub(255, 255, 255, 255);
+
+        f.glEnableClientState(GL_VERTEX_ARRAY);
+        f.glVertexPointer(3, GL_FLOAT, 0, pixels);
+        f.glDrawArrays(GL_POINTS, 0, NB_PIXELS);
+
+        SDL_GL_SwapBuffers();
+
+        while (SDL_PollEvent(&event)) {
+            if (event.type == SDL_KEYDOWN)
+                done = 1;
+        }
+
+        SDL_Delay(20);
+    }
+    while (!done);
+
+    SDL_Quit();
+    return 0;
+}
+
+#else /* HAVE_OPENGLES */
+
+int
+main(int argc, char *argv[])
+{
+    printf("No OpenGL support on this system\n");
+    return 1;
+}
+
+#endif /* HAVE_OPENGLES */