From: Luca Barbieri <luca@luca-barbieri.com>
Date: Sun, 18 Apr 2010 14:43:19 +0000 (+0200)
Subject: nvfx: new 2D: use a CPU copy for up to 4 pixels, up from 0
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=0481ed25c9c35178bf5151c80f4c36ad42b75648;p=mesa.git

nvfx: new 2D: use a CPU copy for up to 4 pixels, up from 0

Seems a reasonable threshold for now.

Significantly speeds up Piglit's 1x1 glReadPixels (but, you know,
reading pixels in 1x1 blocks is NOT a good idea, especially if you
might be running on a less-than-perfect driver).
---

diff --git a/src/gallium/drivers/nvfx/nvfx_surface.c b/src/gallium/drivers/nvfx/nvfx_surface.c
index 8208c67f2a2..7efdd954b4b 100644
--- a/src/gallium/drivers/nvfx/nvfx_surface.c
+++ b/src/gallium/drivers/nvfx/nvfx_surface.c
@@ -250,11 +250,7 @@ nvfx_resource_copy_region(struct pipe_context *pipe,
 
 	static int copy_threshold = -1;
 	if(copy_threshold < 0)
-	{
-		copy_threshold = debug_get_num_option("NOUVEAU_COPY_THRESHOLD", 0);
-		if(copy_threshold < 0)
-			copy_threshold = 0;
-	}
+		copy_threshold = debug_get_num_option("NOUVEAU_COPY_THRESHOLD", 4);
 
 	int dst_to_gpu = dstr->usage != PIPE_USAGE_DYNAMIC && dstr->usage != PIPE_USAGE_STAGING;
 	int src_on_gpu = nvfx_resource_on_gpu(srcr);