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gl: Disable the msaa compositor by default (for release testing)

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One of the remaining issues with msaa is Cairo's insistence on
allocating a depth-stencil for every target. These cause massive
overallocation and prevents my machines from completing
cairo-perf-trace. So for the time being switch back to the old
fashioned span-based compositor.

To continue development of msaa, or indeed other compositors, we
introduce the CAIRO_GL_COMPOSITOR env variable to allow the default
compositor to be selected. Use CAIRO_GL_COMPOSITOR=msaa to continue to
use the msaa compositor for instance.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2011-12-15 19:12:00 +00:00
parent 909f4a4a7f
commit 8f74159d92
1 changed files with 12 additions and 2 deletions
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14
src/cairo-gl-device.c
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@ -161,12 +161,22 @@ _cairo_gl_context_init (cairo_gl_context_t *ctx)
cairo_gl_dispatch_t *dispatch = &ctx->dispatch;
int gl_version = _cairo_gl_get_version ();
cairo_gl_flavor_t gl_flavor = _cairo_gl_get_flavor ();
const char *env;
int n;
_cairo_device_init (&ctx->base, &_cairo_gl_device_backend);
//ctx->compositor = _cairo_gl_span_compositor_get ();
ctx->compositor = _cairo_gl_msaa_compositor_get ();
ctx->compositor = _cairo_gl_span_compositor_get ();
/* XXX The choice of compositor should be made automatically at runtime.
* However, it is useful to force one particular compositor whilst
* testing.
*/
env = getenv ("CAIRO_GL_COMPOSITOR");
if (env) {
if (strcmp(env, "msaa") == 0)
ctx->compositor = _cairo_gl_msaa_compositor_get ();
}
memset (ctx->glyph_cache, 0, sizeof (ctx->glyph_cache));
cairo_list_init (&ctx->fonts);