Merge "Performance optimizations" into rvc-dev (73e0f350) · Commits · e / os / platform_frameworks_native

libs/renderengine/gl/filters/BlurFilter.cpp

+24 −20

Original line number	Diff line number	Diff line
		@@ -122,27 +122,35 @@ void BlurFilter::drawMesh(GLuint uv, GLuint position) {

		status_t BlurFilter::prepare() {
		ATRACE_NAME("BlurFilter::prepare");
		blit(mCompositionFbo, mPingFbo);

		// Kawase is an approximation of Gaussian, but it behaves differently from it.
		// A radius transformation is required for approximating them, and also to introduce
		// non-integer steps, necessary to smoothly interpolate large radii.
		auto radius = mRadius / 6.0f;
		const auto radius = mRadius / 6.0f;

		// Calculate how many passes we'll do, based on the radius.
		// Too many passes will make the operation expensive.
		auto passes = min(kMaxPasses, (uint32_t)ceil(radius));
		const auto passes = min(kMaxPasses, (uint32_t)ceil(radius));

		// We'll ping pong between our textures, to accumulate the result of various offsets.
		const float radiusByPasses = radius / (float)passes;
		const float stepX = radiusByPasses / (float)mCompositionFbo.getBufferWidth();
		const float stepY = radiusByPasses / (float)mCompositionFbo.getBufferHeight();

		// Let's start by downsampling and blurring the composited frame simultaneously.
		mBlurProgram.useProgram();
		glActiveTexture(GL_TEXTURE0);
		glUniform1i(mBTextureLoc, 0);
		glBindTexture(GL_TEXTURE_2D, mCompositionFbo.getTextureName());
		glUniform2f(mBOffsetLoc, stepX, stepY);
		glViewport(0, 0, mPingFbo.getBufferWidth(), mPingFbo.getBufferHeight());
		mPingFbo.bind();
		drawMesh(mBUvLoc, mBPosLoc);

		// And now we'll ping pong between our textures, to accumulate the result of various offsets.
		GLFramebuffer* read = &mPingFbo;
		GLFramebuffer* draw = &mPongFbo;
		float stepX = radius / (float)mCompositionFbo.getBufferWidth() / (float)passes;
		float stepY = radius / (float)mCompositionFbo.getBufferHeight() / (float)passes;
		glViewport(0, 0, draw->getBufferWidth(), draw->getBufferHeight());
		glActiveTexture(GL_TEXTURE0);
		glUniform1i(mBTextureLoc, 0);
		for (auto i = 0; i < passes; i++) {
		for (auto i = 1; i < passes; i++) {
		ATRACE_NAME("BlurFilter::renderPass");
		draw->bind();

		@@ -158,9 +166,6 @@ status_t BlurFilter::prepare() {
		}
		mLastDrawTarget = read;

		// Cleanup
		glBindFramebuffer(GL_FRAMEBUFFER, 0);

		return NO_ERROR;
		}

		@@ -179,7 +184,6 @@ status_t BlurFilter::render(bool multiPass) {
		glBlitFramebuffer(0, 0, mLastDrawTarget->getBufferWidth(),
		mLastDrawTarget->getBufferHeight(), 0, 0, mDisplayWidth, mDisplayHeight,
		GL_COLOR_BUFFER_BIT, GL_LINEAR);
		glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
		return NO_ERROR;
		}

		@@ -258,12 +262,12 @@ string BlurFilter::getMixFragShader() const {
		}

		void BlurFilter::blit(GLFramebuffer& read, GLFramebuffer& draw) const {
		ATRACE_NAME("BlurFilter::blit");
		read.bindAsReadBuffer();
		draw.bindAsDrawBuffer();
		glBlitFramebuffer(0, 0, read.getBufferWidth(), read.getBufferHeight(), 0, 0,
		draw.getBufferWidth(), draw.getBufferHeight(), GL_COLOR_BUFFER_BIT,
		GL_LINEAR);
		glBindFramebuffer(GL_FRAMEBUFFER, 0);
		}

		} // namespace gl