commit 3656db42047ce9e99a2aa984d54650b7cf54073f
Author:     Jonathan Dowland <jon@dow.land>
AuthorDate: Mon Apr 16 16:47:51 2018 +0100
Commit:     Jonathan Dowland <jon@dow.land>
CommitDate: Mon Apr 16 16:47:51 2018 +0100

    Remove the unreliable Software GL check

    This check was designed to warn users if they did not have hardware
    acceleration that performance might be poor and to suggest toggling
    force_software_renderer. However the check is not reliable: it can't
    determine whether hardware acceleration is taking place on Linux, as
    Mesa front-ends both hardware and software implementations.

    We explored alternatives (checking SDL_GL_ACCELERATED_VISUAL) but
    these proved similarly unreliable.

    On Linux, GLX offers glxIsDirect, but this is of no use where GLX
    is not available, including (I think) Linux framebuffer or Wayland.

    Rather than continue to mislead people, delete the test and warning.

    Fixes #825.
---
 src/i_video.c | 28 ----------------------------
 1 file changed, 28 deletions(-)

diff --git a/src/i_video.c b/src/i_video.c
index c44a8a6c..89427c25 100644
--- a/src/i_video.c
+++ b/src/i_video.c
@@ -1310,30 +1310,6 @@ static void SetVideoMode(void)
     CreateUpscaledTexture(true);
 }

-static const char *hw_emu_warning =
-"===========================================================================\n"
-"WARNING: it looks like you are using a software GL implementation.\n"
-"To improve performance, try setting force_software_renderer in your\n"
-"configuration file.\n"
-"===========================================================================\n";
-
-static void CheckGLVersion(void)
-{
-    const char * version;
-    typedef const GLubyte* (APIENTRY * glStringFn_t)(GLenum);
-    glStringFn_t glfp = (glStringFn_t)SDL_GL_GetProcAddress("glGetString");
-
-    if (glfp)
-    {
-        version = (const char *)glfp(GL_VERSION);
-
-        if (version && strstr(version, "Mesa"))
-        {
-            printf("%s", hw_emu_warning);
-        }
-    }
-}
-
 void I_InitGraphics(void)
 {
     SDL_Event dummy;
@@ -1385,10 +1361,6 @@ void I_InitGraphics(void)
     AdjustWindowSize();
     SetVideoMode();

-    // We might have poor performance if we are using an emulated
-    // HW accelerator. Check for Mesa and warn if we're using it.
-    CheckGLVersion();
-
     // Start with a clear black screen
     // (screen will be flipped after we set the palette)