--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/testdyngles.c Fri Aug 15 00:52:52 2008 +0000
@@ -0,0 +1,211 @@
+/*
+ * 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 */