diff --git a/ci_shadervalidator/Logs.h b/ci_shadervalidator/Logs.h
deleted file mode 100644
index d5c87b7e..00000000
--- a/ci_shadervalidator/Logs.h
+++ /dev/null
@@ -1,8 +0,0 @@
-#pragma once
-enum class logtype : unsigned int {
-	shader
-};
-
-inline void ErrorLog(const std::string &, logtype const)
-{
-}
diff --git a/ci_shadervalidator/build.sh b/ci_shadervalidator/build.sh
index b0207f6e..450b2b98 100755
--- a/ci_shadervalidator/build.sh
+++ b/ci_shadervalidator/build.sh
@@ -1,2 +1,16 @@
 #!/bin/sh
-g++ -std=c++17 -O2 -DSHADERVALIDATOR_STANDALONE ../ref/glad/src/glad.c ../gl/glsl_common.cpp ../gl/shader.cpp main.cpp -I../ref/glad/include -I../ref/glm -I. -o validateshaders
+# Offline GLSL validator for shaders/ (the same preprocessing as gl::shader in the game, then glslangValidator).
+#
+# Requirements: g++ with C++20, glslangValidator in PATH (Debian/Ubuntu: apt install glslang-tools),
+# submodule ref/glm (git submodule update --init ref/glm).
+# Usage (Linux; build.sh works from any directory, validateshaders reads ../shaders/ so it runs from here):
+#   ci_shadervalidator/build.sh
+#   cd ci_shadervalidator && ./validateshaders
+# Every .vert/.frag/.geom/.comp under shaders/ is checked twice (features on and off).
+# Exit code is 0 when all shaders pass, 1 otherwise; failing shaders are listed at the end.
+#
+# The validator's own stdafx.h and utilities/{Globals,Logs}.h stand in for the game's headers,
+# so the repository root must not be on the include path.
+set -e
+cd "$(dirname "$0")"
+g++ -std=c++20 -O1 -DSHADERVALIDATOR_STANDALONE ../ref/glad/src/glad.c ../gl/glsl_common.cpp ../gl/shader.cpp main.cpp -I. -I../ref/glad/include -I../ref/glm -o validateshaders
diff --git a/ci_shadervalidator/main.cpp b/ci_shadervalidator/main.cpp
index 65b1f159..37c70cd0 100644
--- a/ci_shadervalidator/main.cpp
+++ b/ci_shadervalidator/main.cpp
@@ -1,17 +1,20 @@
 #include "stdafx.h"
 #include "../gl/shader.h"
 #include "../gl/glsl_common.h"
-#include "Globals.h"
+#include "utilities/Globals.h"
+#include "utilities/Logs.h"
 #include <iostream>
 #include <fstream>
 #include <cstdlib>
 #include <filesystem>
+#include <vector>
 
 _global Global;
 
 bool check_shader(std::string filename)
 {
 	gl::shader shader_processor;
+	shader_processor.name = filename;
 
 	gl::glsl_common_setup();
 	std::pair<GLuint, std::string> source = shader_processor.process_source(filename, "../shaders/");
@@ -23,9 +26,17 @@ bool check_shader(std::string filename)
 		stage = "frag";
 	else if (source.first == GL_GEOMETRY_SHADER)
 		stage = "geom";
+	else if (source.first == GL_COMPUTE_SHADER)
+		stage = "comp";
 	else
 		return false;
 
+	if (ErrorLogged)
+	{
+		ErrorLogged = false;
+		return false;
+	}
+
 	std::ofstream file("/tmp/shader");
 	file << source.second;
 	file.close();
@@ -80,24 +91,38 @@ bool check_shader_confs(std::string filename)
 
 int main()
 {
+	if (system("glslangValidator --version > /dev/null 2>&1") != 0)
+	{
+		std::cerr << "glslangValidator not found in PATH" << std::endl;
+		return 1;
+	}
+
 	bool suc = true;
+	std::vector<std::string> failed;
 	for (auto &f : std::filesystem::recursive_directory_iterator("../shaders/")) {
 		if (!f.is_regular_file())
 			continue;
 
 		std::string relative = std::filesystem::relative(f.path(), "../shaders/").string();
-		if (f.path().extension() != ".frag" && f.path().extension() != ".geom" && f.path().extension() != ".vert")
+		auto const ext = f.path().extension();
+		if (ext != ".frag" && ext != ".geom" && ext != ".vert" && ext != ".comp")
 			continue;
 
 		std::cout << "== validating shader " << relative << ": " << std::flush;
 		if (!check_shader_confs(relative))
+		{
 			suc = false;
+			failed.push_back(relative);
+		}
 	}
 
 	if (suc)
 		std::cout << "==== all checks ok" << std::endl;
 	else {
-		std::cout << "==== checks failed" << std::endl;
+		std::cout << "==== checks failed:";
+		for (auto const &name : failed)
+			std::cout << " " << name;
+		std::cout << std::endl;
 		return 1;
 	}
 
diff --git a/ci_shadervalidator/Globals.h b/ci_shadervalidator/utilities/Globals.h
similarity index 100%
rename from ci_shadervalidator/Globals.h
rename to ci_shadervalidator/utilities/Globals.h
diff --git a/ci_shadervalidator/utilities/Logs.h b/ci_shadervalidator/utilities/Logs.h
new file mode 100644
index 00000000..e227fa88
--- /dev/null
+++ b/ci_shadervalidator/utilities/Logs.h
@@ -0,0 +1,16 @@
+#pragma once
+#include <iostream>
+#include <string>
+
+enum class logtype : unsigned int {
+	shader
+};
+
+// gl::shader reports #texture/#param parse errors through ErrorLog; the validator counts them as failures
+inline bool ErrorLogged = false;
+
+inline void ErrorLog(const std::string &str, logtype const)
+{
+	std::cerr << str << std::endl;
+	ErrorLogged = true;
+}
diff --git a/gl/shader.cpp b/gl/shader.cpp
index ebb55da0..c40c79dc 100644
--- a/gl/shader.cpp
+++ b/gl/shader.cpp
@@ -86,6 +86,8 @@ std::pair<GLuint, std::string> gl::shader::process_source(const std::string &fil
         type = GL_FRAGMENT_SHADER;
     else if (strcend(filename, ".geom"))
         type = GL_GEOMETRY_SHADER;
+    else if (strcend(filename, ".comp"))
+        type = GL_COMPUTE_SHADER;
     else
         throw shader_exception("unknown shader " + filename);
 
@@ -96,6 +98,7 @@ std::pair<GLuint, std::string> gl::shader::process_source(const std::string &fil
     if (type == GL_VERTEX_SHADER)        str += "#define STAGE_VERTEX 1\n";
     else if (type == GL_FRAGMENT_SHADER) str += "#define STAGE_FRAGMENT 1\n";
     else if (type == GL_GEOMETRY_SHADER) str += "#define STAGE_GEOMETRY 1\n";
+    else if (type == GL_COMPUTE_SHADER)  str += "#define STAGE_COMPUTE 1\n";
     str += "vec4 FBOUT(vec4 x) { return " + (Global.gfx_shadergamma ? std::string("vec4(pow(x.rgb, vec3(1.0 / 2.2)), x.a)") : std::string("x")) + "; }\n";
 
     str += read_file(basedir + filename);