From ed749cb752ff65a9df94e7e0cef5c99fe065c8da Mon Sep 17 00:00:00 2001 From: Holmes Futrell Date: Fri, 15 Aug 2008 00:52:52 +0000 Subject: [PATCH] testdyngles is exactly what it sounds like -- a version of testdyngl that uses OpenGL ES calls instead of OpenGL. Was necessary to create because glOrtho is called glOrthof in OpenGL ES, and OpenGL ES doesn't have glBegin() type semantics for specifying geometry. --- test/testdyngles.c | 211 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 211 insertions(+) create mode 100644 test/testdyngles.c diff --git a/test/testdyngles.c b/test/testdyngles.c new file mode 100644 index 000000000..8ca933878 --- /dev/null +++ b/test/testdyngles.c @@ -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 +#include + +#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 */