message: Create internal format as GL_RG8 for LUMINANCE_ALPHA. Closes
diff: @@ -2629,8 +2629,12 @@ void APIENTRY _glGetTexImage(GLenum target, GLint level, GLenum format, GLenum t
  RDCDEBUG("Doing manual blit from %s to allow readback", ToStr(format).c_str());
  GLenum remapformat = eGL_RED;
  + GLenum internalformat = eGL_R8;
  if(format == eGL_LUMINANCE_ALPHA)
  + {
  remapformat = eGL_RG;
  + internalformat = eGL_RG8;
  + }
  GLint baseLevel = 0;
  GLint maxLevel = 0;
  @@ -2648,7 +2652,8 @@ void APIENTRY _glGetTexImage(GLenum target, GLint level, GLenum format, GLenum t
  // allocate the R8 texture
  GL.glTexParameteri(target, eGL_TEXTURE_MAX_LEVEL, 0);
  - GL.glTexImage2D(target, 0, eGL_R8, width, height, 0, remapformat, eGL_UNSIGNED_BYTE, NULL);
  + GL.glTexImage2D(target, 0, internalformat, width, height, 0, remapformat, eGL_UNSIGNED_BYTE,
  + NULL);
  // render to it
  GL.glFramebufferTexture2D(eGL_FRAMEBUFFER, eGL_COLOR_ATTACHMENT0, target, readtex, 0);
  