Attachment 77166 Details for Bug 47607 – LD_PRELOAD hack to renumber uniform locations in a dense manner

LD_PRELOAD hack to renumber uniform locations in a dense manner

anomalyhack.cpp (text/plain), 2.77 KB, created by Alexander Monakov on 2013-03-28 16:45:13 UTC

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Creator: Alexander Monakov

Created: 2013-03-28 16:45:13 UTC

Size: 2.77 KB

patch

obsolete

>// g++ -m32 -O2 -fvisibility=hidden -fPIC -shared -Wl,-Bsymbolic -o anomalyhack.so anomalyhack.cpp -ldl
>
>// Warning: this a quick'n'dirty hack to renumber uniform locations to prevent
>// Anomaly: Warzone Earth from segfaulting; not a good libGL wrapping example
>
>#include <dlfcn.h>
>#include <cstring>
>#include <map>
>#pragma GCC visibility push(default)
>#define GLX_GLXEXT_PROTOTYPES
>#define GL_GLEXT_PROTOTYPES
>#include <GL/glx.h>
>#pragma GCC visibility pop
>
>static std::map<std::pair<GLuint, GLint>, GLint> revmap;
>
>GLint glGetUniformLocation(GLuint program, const GLchar *name)
>{
>  static PFNGLGETUNIFORMLOCATIONPROC realfn = (PFNGLGETUNIFORMLOCATIONPROC) dlsym(RTLD_NEXT, "glGetUniformLocation");
>  GLint nun, un, origloc = realfn(program, name);
>  if (origloc == -1)
>    return -1;
>
>  glGetProgramiv(program, GL_ACTIVE_UNIFORMS, &nun);
>  for (un = 0; un < nun; un++)
>    {
>      GLsizei len;
>      GLint size;
>      GLenum type;
>      GLchar uname[256];
>      glGetActiveUniform(program, un, 256, &len, &size, &type, uname);
>      if (!strcmp(uname, name))
>	break;
>    }
>  revmap[std::make_pair(program, un)] = origloc;
>
>  return un;
>}
>
>void glUniform1i(GLint location, GLint v0)
>{
>  static PFNGLUNIFORM1IPROC realfn = (PFNGLUNIFORM1IPROC) dlsym(RTLD_NEXT, "glUniform1i");
>  GLuint program;
>  glGetIntegerv(GL_CURRENT_PROGRAM, (GLint*)&program);
>  realfn(revmap[std::make_pair(program, location)], v0);
>}
>
>void glUniform4fv(GLint location, GLsizei count, const GLfloat *value)
>{
>  static PFNGLUNIFORM4FVPROC realfn = (PFNGLUNIFORM4FVPROC) dlsym(RTLD_NEXT, "glUniform4fv");
>  GLuint program;
>  glGetIntegerv(GL_CURRENT_PROGRAM, (GLint*)&program);
>  realfn(revmap[std::make_pair(program, location)], count, value);
>}
>
>void glUniformMatrix4fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value)
>{
>  static PFNGLUNIFORMMATRIX4FVPROC realfn = (PFNGLUNIFORMMATRIX4FVPROC) dlsym(RTLD_NEXT, "glUniformMatrix4fv");
>  GLuint program;
>  glGetIntegerv(GL_CURRENT_PROGRAM, (GLint*)&program);
>  realfn(revmap[std::make_pair(program, location)], count, transpose, value);
>}
>
>__GLXextFuncPtr glXGetProcAddressARB(const GLubyte *procName)
>{
>  static const char * const redefined_names[] = {
>    "glGetUniformLocation", "glUniform1i", "glUniform4fv", "glUniformMatrix4fv"
>  };
>  static const __GLXextFuncPtr redefined_fns[] = {
>    (__GLXextFuncPtr) glGetUniformLocation, (__GLXextFuncPtr) glUniform1i, (__GLXextFuncPtr) glUniform4fv, (__GLXextFuncPtr) glUniformMatrix4fv
>  };
>  enum {n_redefined = sizeof(redefined_fns) / sizeof(redefined_fns[0])};
>  for (int i = 0; i < n_redefined; i++)
>    if (!strcmp((const char *)procName, redefined_names[i]))
>      return redefined_fns[i];
>
>  static PFNGLXGETPROCADDRESSPROC realgpa = (PFNGLXGETPROCADDRESSPROC) dlsym(RTLD_NEXT, "glXGetProcAddressARB");
>  return realgpa(procName);
>}

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