Properly destroy shaders & programs

libs/gfx/include/psemek/gfx/program.hpp

@@ -18,6 +18,8 @@ namespace psemek::gfx
 		program(std::string_view vertex_source, std::string_view fragment_source);
 		program(std::string_view vertex_source, std::string_view geometry_source, std::string_view fragment_source);
 
+		~program();
+
 		GLuint id() const;
 
 		void bind() const;

libs/gfx/source/gfx/program.cpp

@@ -1,6 +1,7 @@
 #include <psemek/gfx/program.hpp>
 
 #include <psemek/util/to_string.hpp>
+#include <psemek/util/at_scope_exit.hpp>
 
 #include <memory>
 
@@ -245,6 +246,12 @@ namespace psemek::gfx
 	static GLuint create_program(std::vector<std::pair<GLenum, std::string_view>> const & sources)
 	{
 		std::vector<GLuint> shaders;
+
+		[[maybe_unused]] util::at_scope_exit delete_shaders([&shaders]{
+			for (auto s : shaders)
+				gl::DeleteShader(s);
+		});
+
 		for (auto const & p : sources)
 		{
 			GLuint sh = gl::CreateShader(p.first);
@@ -252,10 +259,16 @@ namespace psemek::gfx
 		}
 
 		GLuint program = gl::CreateProgram();
-		load_program(program, shaders);
 
-		for (auto s : shaders)
+		try
-			gl::DeleteShader(s);
+		{
+			load_program(program, shaders);
+		}
+		catch (...)
+		{
+			gl::DeleteProgram(program);
+			throw;
+		}
 
 		return program;
 	}
@@ -270,6 +283,11 @@ namespace psemek::gfx
 		program_ = create_program({{gl::VERTEX_SHADER, vertex_source}, {gl::GEOMETRY_SHADER, geometry_source}, {gl::FRAGMENT_SHADER, fragment_source}});
 	}
 
+	program::~program()
+	{
+		gl::DeleteProgram(program_);
+	}
+
 	GLuint program::id() const
 	{
 		return program_;

todo.md

@@ -1,4 +1,3 @@
-* Make sure program & shaders are deleted properly if program creation fails
 * Remove gfx::vertex, setup mesh using attributes directly
 * Design affine transforms in geom & use them instead of matrices when appropriate
 * Create an 'app' module that simplifies application creation