Vulkan: Faster state transitions.
Implements a transition table from Pipeline Cache entry to
state change neighbouring Pipeline Cache entries. We use
a 64-bit mask to do a quick scan over the pipeline desc.
This ends up being a lot faster than doing a full hash
and memcmp over the pipeline description.
Note that there could be future optimizations to this design.
We might keep a hash map of the pipeline transitions instead
of a list. Or use a sorted list. This could speed up the search
when there are many transitions for cache entries. Also we could
skip the transition table and opt to do a full hash when there
are more than a configurable number of dirty states. This might
be a bit faster in some cases. Likely this will be something we
can add performance tests for in the future.
Documentation is also added in a README file for the Vulkan back
end. This will be extended over time.
Improves performance about 30-35% on the VBO state change test.
Bug: angleproject:3013
Change-Id: I793f9e3efd8887acf00ad60e4ac2502a54c95dee
Reviewed-on: https://chromium-review.googlesource.com/c/1369287
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
diff --git a/src/libANGLE/renderer/vulkan/ProgramVk.h b/src/libANGLE/renderer/vulkan/ProgramVk.h
index 5b6147f..70b6ad0 100644
--- a/src/libANGLE/renderer/vulkan/ProgramVk.h
+++ b/src/libANGLE/renderer/vulkan/ProgramVk.h
@@ -123,7 +123,8 @@
gl::PrimitiveMode mode,
const vk::GraphicsPipelineDesc &desc,
const gl::AttributesMask &activeAttribLocations,
- vk::PipelineAndSerial **pipelineOut)
+ const vk::GraphicsPipelineDesc **descPtrOut,
+ vk::PipelineHelper **pipelineOut)
{
vk::ShaderProgramHelper *shaderProgram;
ANGLE_TRY(initShaders(contextVk, mode, &shaderProgram));
@@ -132,7 +133,7 @@
return shaderProgram->getGraphicsPipeline(
contextVk, &renderer->getRenderPassCache(), renderer->getPipelineCache(),
renderer->getCurrentQueueSerial(), mPipelineLayout.get(), desc, activeAttribLocations,
- pipelineOut);
+ descPtrOut, pipelineOut);
}
private: