Re-land "Implement EGL_experimental_present_path_angle"
- Re-land with clang fix.
This allows ANGLE to render directly onto a D3D swapchain in the correct
orientation when using the D3D11 renderer.
The trick is to add an extra uniform to each shader which takes either
the value +1.0 or -1.0. When rendering to a texture, ANGLE sets this
value to -1.0. When rendering to the default framebuffer, ANGLE sets
this value to +1.0. ANGLE multiplies vertex positions by this value in
the VS to invert rendering when appropriate. It also corrects other
state (e.g. viewport/scissor rect) and shader built-in values
(e.g. gl_FragCoord).
This saves a substantial amount of GPU time and lowers power
consumption. For example, the old method (where ANGLE renders all
content onto an offscreen texture, and then copies/inverts this onto the
swapchain at eglSwapBuffers() time) uses about 20% of the GPU each frame
on a Lumia 630.
Verification:
+ dEQP GL ES2 tests pass when "present path fast" is enabled
+ all ANGLE_end2end_tests pass when "present path fast" is enabled
BUG=angleproject:1219
Change-Id: I56b339897828753a616d7bae837a2f354dba9c63
Reviewed-on: https://chromium-review.googlesource.com/326730
Tryjob-Request: Austin Kinross <aukinros@microsoft.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
diff --git a/src/compiler/translator/OutputHLSL.cpp b/src/compiler/translator/OutputHLSL.cpp
index 170875e..253b966 100644
--- a/src/compiler/translator/OutputHLSL.cpp
+++ b/src/compiler/translator/OutputHLSL.cpp
@@ -505,6 +505,13 @@
out << " float3 dx_DepthFront : packoffset(c2);\n";
}
+ if (mUsesFragCoord)
+ {
+ // dx_ViewScale is only used in the fragment shader to correct
+ // the value for glFragCoord if necessary
+ out << " float2 dx_ViewScale : packoffset(c3);\n";
+ }
+
out << "};\n";
}
else
@@ -599,11 +606,13 @@
out << " float3 dx_DepthRange : packoffset(c0);\n";
}
- // dx_ViewAdjust and dx_ViewCoords will only be used in Feature Level 9 shaders.
- // However, we declare it for all shaders (including Feature Level 10+).
- // The bytecode is the same whether we declare it or not, since D3DCompiler removes it if it's unused.
+ // dx_ViewAdjust and dx_ViewCoords will only be used in Feature Level 9
+ // shaders. However, we declare it for all shaders (including Feature Level 10+).
+ // The bytecode is the same whether we declare it or not, since D3DCompiler removes it
+ // if it's unused.
out << " float4 dx_ViewAdjust : packoffset(c1);\n";
out << " float2 dx_ViewCoords : packoffset(c2);\n";
+ out << " float2 dx_ViewScale : packoffset(c3);\n";
out << "};\n"
"\n";