mesa: Implement a new GL_MESA_tile_raster_order extension.

The intent is to use this extension on vc4 to allow X11 to do overlapping
CopyArea() within a pixmap without first blitting the pixmap to a
temporary.  With associated glamor patches, improves x11perf
-copywinwin100 performance on a Raspberry Pi 3 from ~4700/sec to
~5130/sec, and is an even larger boost to uncomposited window movement
performance (most copywinwin100 copies don't overlap).

v2: Fix glIsEnabled() on the new enums.
v3: Drop the local spec since I'm upstreaming the spec.

Reviewed-by: Nicolai Hähnle <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index 676103d4778..6d24b93c192 100644
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -867,6 +867,8 @@ init_attrib_groups(struct gl_context *ctx)
       return GL_FALSE;
 
    /* Miscellaneous */
+   ctx->TileRasterOrderIncreasingX = GL_TRUE;
+   ctx->TileRasterOrderIncreasingY = GL_TRUE;
    ctx->NewState = _NEW_ALL;
    ctx->NewDriverState = ~0;
    ctx->ErrorValue = GL_NO_ERROR;