From a9fa1ff3c65f9e7f8a1ac201a2befb0f49008885 Mon Sep 17 00:00:00 2001
From: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Date: Wed, 12 Jun 2024 02:08:02 +0100
Subject: [PATCH] libcamera: software_isp: debayer_egl: Make DebayerEGL an
 environment option

If GPUISP support is available make it so an environment variable can
switch it on.

Given we don't have full feature parity with CPUISP just yet on pixel
format output, we should default to CPUISP mode giving the user the option
to switch on GPUISP by setting LIBCAMERA_SOFTISP_MODE=gpu

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
---
 src/libcamera/software_isp/software_isp.cpp | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/libcamera/software_isp/software_isp.cpp b/src/libcamera/software_isp/software_isp.cpp
index e8fa8a17a..ff4471c05 100644
--- a/src/libcamera/software_isp/software_isp.cpp
+++ b/src/libcamera/software_isp/software_isp.cpp
@@ -15,6 +15,7 @@
 
 #include <libcamera/base/log.h>
 #include <libcamera/base/thread.h>
+#include <libcamera/base/utils.h>
 
 #include <libcamera/controls.h>
 #include <libcamera/formats.h>
@@ -25,6 +26,9 @@
 #include "libcamera/internal/software_isp/debayer_params.h"
 
 #include "debayer_cpu.h"
+#if HAVE_DEBAYER_EGL
+#include "debayer_egl.h"
+#endif
 
 /**
  * \file software_isp.cpp
@@ -114,7 +118,20 @@ SoftwareIsp::SoftwareIsp(PipelineHandler *pipe, const CameraSensor *sensor,
 	}
 	stats->statsReady.connect(this, &SoftwareIsp::statsReady);
 
-	debayer_ = std::make_unique<DebayerCpu>(std::move(stats));
+#if HAVE_DEBAYER_EGL
+	const char *softISPMode = utils::secure_getenv("LIBCAMERA_SOFTISP_MODE");
+
+	if (softISPMode && !strcmp(softISPMode, "gpu"))
+		debayer_ = std::make_unique<DebayerEGL>(std::move(stats));
+#endif
+	if (!debayer_)
+		debayer_ = std::make_unique<DebayerCpu>(std::move(stats));
+
+	if (!debayer_) {
+		LOG(SoftwareIsp, Error) << "Failed to create Debayer object";
+		return;
+	}
+
 	debayer_->inputBufferReady.connect(this, &SoftwareIsp::inputReady);
 	debayer_->outputBufferReady.connect(this, &SoftwareIsp::outputReady);