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Fixed bug 3173 - SDL_GL_GetAttribute overwrites error code from SDL_G…


Yann Dirson

When SDL_GL_GetProcAddress returns in error, the cause of the error is overwritten
in GL_GL_GetAttribute, reporting to the user "Failed getting OpenGL glGetString entry point", whereas the original "OpenGL library not loaded" never makes it
to the user.

Pushed a fix to:

Note that the "OpenGL library not loaded" error looks like no root cause either,
and I'm still puzzled by the code path used: I'm forcing opengles2 renderer on
the x11 video driver on a rpi2, as in, and although I now know that I must force the use of the RPI video driver instead
of the x11 one, I suspect even more accurate info can be given to user.
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slouken committed Aug 12, 2017
1 parent b1ed855 commit 4a9c6f0a14b2b17c335eacba46a52a2241428db6
Showing with 4 additions and 4 deletions.
  1. +4 −4 src/video/SDL_video.c
@@ -3302,7 +3302,7 @@ SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
if (!glGetStringFunc) {
return SDL_SetError("Failed getting OpenGL glGetString entry point");
return -1;

if (attachmentattrib && isAtLeastGL3((const char *) glGetStringFunc(GL_VERSION))) {
@@ -3311,7 +3311,7 @@ SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
if (glGetFramebufferAttachmentParameterivFunc) {
glGetFramebufferAttachmentParameterivFunc(GL_FRAMEBUFFER, attachment, attachmentattrib, (GLint *) value);
} else {
return SDL_SetError("Failed getting OpenGL glGetFramebufferAttachmentParameteriv entry point");
return -1;
} else
@@ -3321,13 +3321,13 @@ SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
if (glGetIntegervFunc) {
glGetIntegervFunc(attrib, (GLint *) value);
} else {
return SDL_SetError("Failed getting OpenGL glGetIntegerv entry point");
return -1;

glGetErrorFunc = SDL_GL_GetProcAddress("glGetError");
if (!glGetErrorFunc) {
return SDL_SetError("Failed getting OpenGL glGetError entry point");
return -1;

error = glGetErrorFunc();

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