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svga: document magic number of 8 render targets per batch

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Grab the comments from commit message b84b7f19df to explain
what the code is doing.
This commit is contained in:
Brian Paul 2013-11-07 16:57:23 -07:00
parent dc21b36daf
commit 2182d2db28
1 changed files with 13 additions and 1 deletions
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14
src/gallium/drivers/svga/svga_state_framebuffer.c
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@ -33,6 +33,18 @@
#include "svga_debug.h"
/*
* flush our command buffer after the 8th distinct render target
*
* This helps improve the surface cache behaviour in the face of the
* large number of single-use render targets generated by EXA and the xorg
* state tracker. Without this we can reference hundreds of individual
* render targets from a command buffer, which leaves little scope for
* sharing or reuse of those targets.
*/
#define MAX_RT_PER_BATCH 8
/***********************************************************************
* Hardware state update
*/
@ -56,7 +68,7 @@ emit_framebuffer( struct svga_context *svga,
for(i = 0; i < PIPE_MAX_COLOR_BUFS; ++i) {
if (curr->cbufs[i] != hw->cbufs[i] ||
(reemit && hw->cbufs[i])) {
if (svga->curr.nr_fbs++ > 8)
if (svga->curr.nr_fbs++ > MAX_RT_PER_BATCH)
return PIPE_ERROR_OUT_OF_MEMORY;
ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_COLOR0 + i, curr->cbufs[i]);