From 82144b7392d1651167cbfd4746aea6a14d5aff46 Mon Sep 17 00:00:00 2001 From: Kenneth Graunke Date: Thu, 12 Oct 2017 20:47:41 -0700 Subject: [PATCH] i965: Don't disable aux buffers for non-overlapping miplevels. Meta's GenerateMipmap implementation binds the same image for both sampling and rendering - but it samples from one miplevel while rendering the next. This is a false self-dependency, and there's no need to disable auxiliary buffers in this case. In fact, we really want to leave it enabled so the new miplevels gain color compression. Thankfully, the texture object's _MaxLevel is always one shy of the miplevel being rendered. So we can simply check if irb->mt_level is overlaps with the texture's defined levels. If not, there's no self- dependency and we can leave the auxiliary buffers enabled. Fixes a performance regression in GFXBench4 Car Chase, which apparently calls glGenerateMipmap() on every frame. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103247 Reviewed-by: Topi Pohjolainen Reviewed-by; Jason Ekstrand --- src/mesa/drivers/dri/i965/brw_draw.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/src/mesa/drivers/dri/i965/brw_draw.c b/src/mesa/drivers/dri/i965/brw_draw.c index 486ada9..b74ab8b 100644 --- a/src/mesa/drivers/dri/i965/brw_draw.c +++ b/src/mesa/drivers/dri/i965/brw_draw.c @@ -344,6 +344,7 @@ brw_merge_inputs(struct brw_context *brw, static bool intel_disable_rb_aux_buffer(struct brw_context *brw, struct intel_mipmap_tree *tex_mt, + unsigned min_level, unsigned num_levels, const char *usage) { const struct gl_framebuffer *fb = brw->ctx.DrawBuffer; @@ -358,7 +359,9 @@ intel_disable_rb_aux_buffer(struct brw_context *brw, const struct intel_renderbuffer *irb = intel_renderbuffer(fb->_ColorDrawBuffers[i]); - if (irb && irb->mt->bo == tex_mt->bo) { + if (irb && irb->mt->bo == tex_mt->bo && + irb->mt_level >= min_level && + irb->mt_level < min_level + num_levels) { found = brw->draw_aux_buffer_disabled[i] = true; } } @@ -414,7 +417,8 @@ brw_predraw_resolve_inputs(struct brw_context *brw) } const bool disable_aux = - intel_disable_rb_aux_buffer(brw, tex_obj->mt, "for sampling"); + intel_disable_rb_aux_buffer(brw, tex_obj->mt, min_level, num_levels, + "for sampling"); intel_miptree_prepare_texture(brw, tex_obj->mt, view_format, min_level, num_levels, @@ -440,7 +444,7 @@ brw_predraw_resolve_inputs(struct brw_context *brw) tex_obj = intel_texture_object(u->TexObj); if (tex_obj && tex_obj->mt) { - intel_disable_rb_aux_buffer(brw, tex_obj->mt, + intel_disable_rb_aux_buffer(brw, tex_obj->mt, 0, ~0, "as a shader image"); intel_miptree_prepare_image(brw, tex_obj->mt); -- 2.7.4