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For EGL purpose avoid using linked glGetString, load it via eglGetProcAddress instead.

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This commit is contained in:
Nigel Stewart 2016-01-27 22:15:49 +10:00
parent 3be106a263
commit 4c5472555a
3 changed files with 37 additions and 4 deletions
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2
auto/src/glew_init_egl.c
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@ -5,7 +5,7 @@ GLboolean eglewGetExtension (const char* name)
const GLubyte* start; const GLubyte* start;
const GLubyte* end; const GLubyte* end;
start = (const GLubyte*) eglQueryString(eglGetDisplay(EGL_DEFAULT_DISPLAY), EGL_EXTENSIONS); start = (const GLubyte*) eglQueryString(eglGetCurrentDisplay(), EGL_EXTENSIONS);
if (0 == start) return GL_FALSE; if (0 == start) return GL_FALSE;
end = start + _glewStrLen(start); end = start + _glewStrLen(start);
return _glewSearchExtension(name, start, end); return _glewSearchExtension(name, start, end);

17
auto/src/glew_init_gl.c
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@ -71,14 +71,22 @@ GLboolean GLEWAPIENTRY glewGetExtension (const char* name)
/* ------------------------------------------------------------------------- */ /* ------------------------------------------------------------------------- */
typedef const GLubyte* (GLAPIENTRY * PFNGLGETSTRINGPROC) (GLenum name);
typedef void (GLAPIENTRY * PFNGLGETINTEGERVPROC) (GLenum pname, GLint *params);
static GLenum GLEWAPIENTRY glewContextInit () static GLenum GLEWAPIENTRY glewContextInit ()
{ {
PFNGLGETSTRINGPROC getString;
const GLubyte* s; const GLubyte* s;
GLuint dot; GLuint dot;
GLint major, minor; GLint major, minor;
/* query opengl version */ /* query opengl version */
s = glGetString(GL_VERSION); getString = (PFNGLGETSTRINGPROC) glewGetProcAddress((const GLubyte*)"glGetString");
if (!getString)
return GLEW_ERROR_NO_GL_VERSION;
s = getString(GL_VERSION);
dot = _glewStrCLen(s, '.'); dot = _glewStrCLen(s, '.');
if (dot == 0) if (dot == 0)
return GLEW_ERROR_NO_GL_VERSION; return GLEW_ERROR_NO_GL_VERSION;
@ -123,11 +131,14 @@ static GLenum GLEWAPIENTRY glewContextInit ()
{ {
GLint n = 0; GLint n = 0;
GLint i; GLint i;
PFNGLGETINTEGERVPROC getIntegerv;
PFNGLGETSTRINGIPROC getStringi; PFNGLGETSTRINGIPROC getStringi;
const char *ext; const char *ext;
GLboolean *enable; GLboolean *enable;
glGetIntegerv(GL_NUM_EXTENSIONS, &n); getIntegerv = (PFNGLGETINTEGERVPROC) glewGetProcAddress((const GLubyte*)"glGetIntegerv");
if (getIntegerv)
getIntegerv(GL_NUM_EXTENSIONS, &n);
/* glGetStringi is OpenGL 3.0 */ /* glGetStringi is OpenGL 3.0 */
getStringi = (PFNGLGETSTRINGIPROC) glewGetProcAddress((const GLubyte*)"glGetStringi"); getStringi = (PFNGLGETSTRINGIPROC) glewGetProcAddress((const GLubyte*)"glGetStringi");
@ -156,7 +167,7 @@ static GLenum GLEWAPIENTRY glewContextInit ()
char ext[128]; char ext[128];
GLboolean *enable; GLboolean *enable;
extensions = (const char *) glGetString(GL_EXTENSIONS); extensions = (const char *) getString(GL_EXTENSIONS);
if (extensions) if (extensions)
{ {

22
auto/src/glewinfo_tail.c
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@ -23,6 +23,11 @@ int main (int argc, char** argv)
0 /* flags */ 0 /* flags */
}; };
#if defined(GLEW_EGL)
typedef const GLubyte* (GLAPIENTRY * PFNGLGETSTRINGPROC) (GLenum name);
PFNGLGETSTRINGPROC getString;
#endif
if (glewParseArgs(argc-1, argv+1, &params)) if (glewParseArgs(argc-1, argv+1, &params))
{ {
fprintf(stderr, "Usage: glewinfo " fprintf(stderr, "Usage: glewinfo "
@ -55,6 +60,17 @@ int main (int argc, char** argv)
glewDestroyContext(); glewDestroyContext();
return 1; return 1;
} }
#if defined(GLEW_EGL)
getString = (PFNGLGETSTRINGPROC) eglGetProcAddress("glGetString");
if (!getString)
{
fprintf(stderr, "Error: eglGetProcAddress failed to fetch glGetString\n");
glewDestroyContext();
return 1;
}
#endif
#if defined(_WIN32) #if defined(_WIN32)
#if defined(_MSC_VER) && (_MSC_VER >= 1400) #if defined(_MSC_VER) && (_MSC_VER >= 1400)
if (fopen_s(&f, "glewinfo.txt", "w") != 0) if (fopen_s(&f, "glewinfo.txt", "w") != 0)
@ -78,9 +94,15 @@ int main (int argc, char** argv)
fprintf(f, "Reporting capabilities of display %s, visual 0x%x\n", fprintf(f, "Reporting capabilities of display %s, visual 0x%x\n",
params.display == NULL ? getenv("DISPLAY") : params.display, params.visual); params.display == NULL ? getenv("DISPLAY") : params.display, params.visual);
#endif #endif
#if defined(GLEW_EGL)
fprintf(f, "Running on a %s from %s\n",
getString(GL_RENDERER), getString(GL_VENDOR));
fprintf(f, "OpenGL version %s is supported\n", getString(GL_VERSION));
#else
fprintf(f, "Running on a %s from %s\n", fprintf(f, "Running on a %s from %s\n",
glGetString(GL_RENDERER), glGetString(GL_VENDOR)); glGetString(GL_RENDERER), glGetString(GL_VENDOR));
fprintf(f, "OpenGL version %s is supported\n", glGetString(GL_VERSION)); fprintf(f, "OpenGL version %s is supported\n", glGetString(GL_VERSION));
#endif
glewInfo(); glewInfo();
#if defined(GLEW_OSMESA) #if defined(GLEW_OSMESA)
#elif defined(GLEW_EGL) #elif defined(GLEW_EGL)