Bug#1014937: stormbaancoureur: Slow/wrong rendering on Intel 945GM x86/MMX/SSE2

[Nils Dagsson Moskopp]

Package: stormbaancoureur
Version: 2.1.6-3
Followup-For: Bug #1014937
X-Debbugs-Cc: nils+debian-reportbug at dieweltistgarnichtso.net

I haveinvestigated the source package of stormbaancoureur.

The file src-common/ogl.cxx contains the shadow rendering functionality.

It also contains a check for when exactly shadow rendering is enabled:

--- 8< --- snip --- 8< ---
/*
 * This helper function checks wether we have all req'd extensions for shadow mapping
 */
bool OglCanDoShadowing(void)
{
  if (getenv("PLODE_NO_SHADOWS")) return false;
  const char *vers = (const char*) glGetString(GL_VERSION);
  const char *rend = (const char*) glGetString(GL_RENDERER);
  fprintf(stderr, "OpenGL is version %s\n", vers);
  fprintf(stderr, "OpenGL renderer %s\n", rend);
  const char *exts = (const char*) glGetString(GL_EXTENSIONS);
  //fprintf(stderr, "OpenGL has extensions %s\n", exts);
  if (!strstr(exts, "GL_ARB_multitexture")) return false;
  if (!strstr(exts, "GL_ARB_depth_texture")) return false;
  if (!strstr(exts, "GL_ARB_shadow")) return false;
  if (!strstr(exts, "GL_EXT_framebuffer_object")) return false;
  if (!strstr(exts, "GL_ARB_vertex_shader")) return false;
  if (!strstr(exts, "GL_ARB_fragment_shader")) return false;
  if (!strstr(exts, "GL_ARB_shader_objects")) return false;
  return true;
}
--- >8 --- snap --- >8 ---

The Irrlicht engine manages to do bug-free realtime shadows on the same GPU.
Therefore, I assume that this issue can be worked around relatively easily.

-- System Information:
Debian Release: 11.3
  APT prefers stable
  APT policy: (900, 'stable'), (500, 'oldoldstable')
Architecture: i386 (i686)

Kernel: Linux 5.10.0-10-686 (SMP w/2 CPU threads)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages stormbaancoureur depends on:
ii  freeglut3               2.8.1-6
ii  libasound2              1.2.4-1.1
ii  libc6                   2.31-13+deb11u3
ii  libgcc-s1               10.2.1-6
ii  libgl1                  1.3.2-1
ii  libglu1-mesa [libglu1]  9.0.1-1
ii  libode8                 2:0.16.2-1
ii  libplib1                1.8.5-8+deb11u1
ii  libstdc++6              10.2.1-6
ii  stormbaancoureur-data   2.1.6-3

stormbaancoureur recommends no packages.

stormbaancoureur suggests no packages.

-- no debconf information