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st/dri: add a way to force MSAA on with an environment variable

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There are 2 ways. I prefer the former:
  GALLIUM_MSAA=n
  __GL_FSAA_MODE=n

Tested with ETQW, which doesn't support MSAA on Linux. This is
the only way to get MSAA there.

Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
Marek Olšák 2012-12-10 21:35:59 +01:00
parent afa902a705
commit 1d0bf69f83
1 changed files with 39 additions and 4 deletions
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43
src/gallium/state_trackers/dri/common/dri_screen.c
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@ -194,6 +194,37 @@ dri_fill_in_modes(struct dri_screen *screen)
return (const __DRIconfig **)configs;
}
/* The Gallium way to force MSAA. */
DEBUG_GET_ONCE_NUM_OPTION(msaa, "GALLIUM_MSAA", 0);
/* The NVIDIA way to force MSAA. The same variable is used by the NVIDIA
* driver. */
DEBUG_GET_ONCE_NUM_OPTION(msaa_nv, "__GL_FSAA_MODE", 0);
static void
dri_force_msaa_visual(struct st_visual *stvis,
struct pipe_screen *screen)
{
int i;
int samples = debug_get_option_msaa();
if (!samples)
samples = debug_get_option_msaa_nv();
if (samples <= 1)
return; /* nothing to do */
/* Choose a supported sample count greater than or equal to samples. */
for (i = samples; i <= MSAA_VISUAL_MAX_SAMPLES; i++) {
if (screen->is_format_supported(screen, stvis->color_format,
PIPE_TEXTURE_2D, i,
PIPE_BIND_RENDER_TARGET)) {
stvis->samples = i;
break;
}
}
}
/**
* Roughly the converse of dri_fill_in_modes.
*/
@ -206,10 +237,6 @@ dri_fill_st_visual(struct st_visual *stvis, struct dri_screen *screen,
if (!mode)
return;
if (mode->sampleBuffers) {
stvis->samples = mode->samples;
}
if (mode->redBits == 8) {
if (mode->alphaBits == 8)
stvis->color_format = PIPE_FORMAT_B8G8R8A8_UNORM;
@ -219,6 +246,14 @@ dri_fill_st_visual(struct st_visual *stvis, struct dri_screen *screen,
stvis->color_format = PIPE_FORMAT_B5G6R5_UNORM;
}
if (mode->sampleBuffers) {
stvis->samples = mode->samples;
}
else {
/* This must be done after stvis->color_format is set. */
dri_force_msaa_visual(stvis, screen->base.screen);
}
switch (mode->depthBits) {
default:
case 0: