I couldn't override dlsym but I managed to fake the glGetProgramiv results

by overriding the glxGetProcAddress (glx.h)

diff --git a/src/gliar.c b/src/gliar.c
index e83d5cd..7ba60d9 100644 (file)
--- a/src/gliar.c
+++ b/src/gliar.c
@@ -42,6 +42,7 @@ static const GLubyte* (*gl_get_string)(GLenum);
 static const GLubyte* (*gl_get_stringi)(GLenum, GLuint);
 static void (*gl_get_integerv)(GLenum, GLint*);
 static void (*gl_get_programiv)(GLuint, GLenum, GLint*);
+static void *(*glx_get_proc_address)(const unsigned char*);
 
 /*static const void* (*gl_get_booleanv)(GLenum, GLboolean*);
 static const void* (*gl_get_doublev)(GLenum, GLdouble*);
@@ -65,6 +66,7 @@ static int init(void)
        gl_get_stringi = dlsym(RTLD_NEXT, "glGetStringi");
        gl_get_integerv = dlsym(RTLD_NEXT, "glGetIntegerv");
        gl_get_programiv = dlsym(RTLD_NEXT, "glGetProgramivARB");
+       glx_get_proc_address = dlsym(RTLD_NEXT, "glXGetProcAddress");
 
        if(init_valid_extensions() == -1) {
                fprintf(stderr, "GLIAR: failed to initialize the valid extension list, might end up with unavailable extensions!\n");
@@ -406,3 +408,20 @@ void glGetProgramivARB(GLuint program, GLenum pname, GLint *params)
        gl_get_programiv(program, pname, params);
 
 }
+
+void *glXGetProcAddress(const unsigned char *procname)
+{
+       if(!glx_get_proc_address) {
+               glx_get_proc_address = dlsym(RTLD_NEXT, "glXGetProcAddress");
+               if(!glx_get_proc_address) {
+                       return 0;
+               }
+       }
+
+       if(!strcmp((char*)procname, "glGetProgramivARB")) {
+               char *overr_name = "gl_get_programiv";
+               return glx_get_proc_address((unsigned char*)overr_name);
+       }
+
+       return glx_get_proc_address(procname);
+}