Bug 72781 – libsdl not enabling hardware acceleration

• Product: Gentoo Linux
• Status: RESOLVED INVALID

[Description Dave 2004-11-28 18:00:04 UTC]

SDL_GetVideoInfo() is showing that hardware acceleration is not being used.

I'm using the current nvidia driver on a 2.6 kernel.  My glxgears shows a decent frame rate and glxinfo shows hardware acceleration is being used there.

I've asked about this on Gentoo Forums, and the few answers I've received showed the same results.  For whatever reason (ebuild, or libsdl source), libsdl is not using hardware acceleration, even though there's no reason it shouldn't.


Reproducible: Always
Steps to Reproduce:
1. Enter the following simple program and save as "test.cc":
#include "SDL/SDL.h"
#include <stdlib.h>

const SDL_VideoInfo* g_pVideoInfo = NULL;

int main(int argc, char* argv[])
{
   SDL_Init(SDL_INIT_VIDEO);
   atexit(SDL_Quit);
   g_pVideoInfo = SDL_GetVideoInfo();
   fprintf(stdout, "\nVideo Information:\n");
   fprintf(stdout, "hw_available? %d\n", g_pVideoInfo->hw_available);
   fprintf(stdout, "wm_available? %d\n", g_pVideoInfo->wm_available);
   fprintf(stdout, "blit_hw? %d\n", g_pVideoInfo->blit_hw);
   fprintf(stdout, "blit_hw_CC? %d\n", g_pVideoInfo->blit_hw_CC);
   fprintf(stdout, "blit_hw_A? %d\n", g_pVideoInfo->blit_hw_A);
   fprintf(stdout, "blit_sw? %d\n", g_pVideoInfo->blit_sw);
   fprintf(stdout, "blit_sw_CC? %d\n", g_pVideoInfo->blit_sw_CC);
   fprintf(stdout, "blit_sw_A? %d\n", g_pVideoInfo->blit_sw_A);
   fprintf(stdout, "blit_fill? %d\n", g_pVideoInfo->blit_fill);
   fprintf(stdout, "video memory (in K)? %d\n", g_pVideoInfo->video_mem);
   fprintf(stdout, "bits per pixel? %d\n", g_pVideoInfo->vfmt->BitsPerPixel);

   return 0;
}

2. Compile with:

g++ -Wall -ISDL -L/usr/lib -lSDL test1.cc

Actual Results:  
Video Information:
hw_available? 0
wm_available? 1
blit_hw? 0
blit_hw_CC? 0
blit_hw_A? 0
blit_sw? 0
blit_sw_CC? 0
blit_sw_A? 0
blit_fill? 0
video memory (in K)? 0
bits per pixel? 16




Expected Results:  
hw_available should have something != 0.
blit_hw should have something != 0.
etc.

[Comment 1 SpanKY 2004-12-01 20:18:38 UTC]

going by the FAQ on libsdl.org (which you should have read :P) this is correct behavior