Improve the speed of MarkAttachmentsDirty.

Only iterate the enabled draw buffers, and the depth/stencil buffer. This series of small optimizations gives about a 15% improvement on the draw call benchmark for the D3D11 backend with the null driver. BUG=angleproject:1155 Change-Id: I5b29362f93c016c146d2a6527b378853bc070239 Reviewed-on: https://chromium-review.googlesource.com/666046Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>

Improve the speed of MarkAttachmentsDirty.
74b30e46 · Jamie Madill · Commit Bot · 1b7ed0ef · 74b30e46
Commit 74b30e46 authored Sep 20, 2017 by Jamie Madill Committed by Commit Bot Sep 21, 2017
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Showing with 11 additions and 8 deletions

Framebuffer11.cpp src/libANGLE/renderer/d3d/d3d11/Framebuffer11.cpp +11 -8

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--- a/src/libANGLE/renderer/d3d/d3d11/Framebuffer11.cpp
+++ b/src/libANGLE/renderer/d3d/d3d11/Framebuffer11.cpp
@@ -33,7 +33,7 @@ namespace
 gl::Error MarkAttachmentsDirty(const gl::Context *context,
                               const gl::FramebufferAttachment *attachment)
 {
-    if (attachment && attachment->type() == GL_TEXTURE)
+    if (attachment->type() == GL_TEXTURE)
    {
        gl::Texture *texture = attachment->getTexture();

@@ -98,16 +98,19 @@ Framebuffer11::~Framebuffer11()

 gl::Error Framebuffer11::markAttachmentsDirty(const gl::Context *context) const
 {
-    for (const auto &colorAttachment : mState.getColorAttachments())
+    const auto &colorAttachments = mState.getColorAttachments();
+    for (size_t drawBuffer : mState.getEnabledDrawBuffers())
    {
-        if (colorAttachment.isAttached())
-        {
-            ANGLE_TRY(MarkAttachmentsDirty(context, &colorAttachment));
-        }
+        const gl::FramebufferAttachment &colorAttachment = colorAttachments[drawBuffer];
+        ASSERT(colorAttachment.isAttached());
+        ANGLE_TRY(MarkAttachmentsDirty(context, &colorAttachment));
    }

-    ANGLE_TRY(MarkAttachmentsDirty(context, mState.getDepthAttachment()));
-    ANGLE_TRY(MarkAttachmentsDirty(context, mState.getStencilAttachment()));
+    auto dsAttachment = mState.getDepthOrStencilAttachment();
+    if (dsAttachment)
+    {
+        ANGLE_TRY(MarkAttachmentsDirty(context, dsAttachment));
+    }

    return gl::NoError();
 }