From f2c5923f005a3e22ddc12a4bb700d838f470bb1d Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Tue, 15 Nov 2022 17:47:56 +0000
Subject: Shaders can be deleted once attached to a program

---
 gfx/gl/program.h  |  2 +-
 gfx/gl/shader.cpp | 15 +++++++--------
 gfx/gl/shader.h   |  5 ++---
 3 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/gfx/gl/program.h b/gfx/gl/program.h
index f14b0f3..eb10888 100644
--- a/gfx/gl/program.h
+++ b/gfx/gl/program.h
@@ -12,7 +12,7 @@ class Program {
 public:
 	template<typename... S> Program(const S &... srcs)
 	{
-		(glAttachShader(m_program, srcs), ...);
+		(glAttachShader(m_program, srcs.compile()), ...);
 		linkAndValidate();
 	}
 	virtual ~Program() = default;
diff --git a/gfx/gl/shader.cpp b/gfx/gl/shader.cpp
index 8b0f614..5f83b83 100644
--- a/gfx/gl/shader.cpp
+++ b/gfx/gl/shader.cpp
@@ -3,16 +3,15 @@
 #include <stdexcept>
 #include <string>
 
-Shader::operator GLuint() const
+Shader::ShaderRef
+Shader::compile() const
 {
-	if (!shader) {
-		shader.emplace(type);
-		glShaderSource(*shader, 1, &text, &len);
-		glCompileShader(*shader);
+	ShaderRef shader {type};
+	glShaderSource(shader, 1, &text, &len);
+	glCompileShader(shader);
 
-		CheckShaderError(*shader, GL_COMPILE_STATUS, false, "Error compiling shader!");
-	}
-	return *shader;
+	CheckShaderError(shader, GL_COMPILE_STATUS, false, "Error compiling shader!");
+	return shader;
 }
 
 void
diff --git a/gfx/gl/shader.h b/gfx/gl/shader.h
index 1a8ddef..a20636d 100644
--- a/gfx/gl/shader.h
+++ b/gfx/gl/shader.h
@@ -7,15 +7,14 @@
 
 class Shader {
 public:
+	using ShaderRef = glRef<GLuint, &__glewCreateShader, &__glewDeleteShader>;
 	constexpr Shader(const GLchar * text, GLint len, GLuint type) : text {text}, len {len}, type {type} { }
 
-	operator GLuint() const;
+	ShaderRef compile() const;
 	static void CheckShaderError(GLuint shader, GLuint flag, bool isProgram, std::string_view errorMessage);
 
 private:
-	using ShaderRef = glRef<GLuint, &__glewCreateShader, &__glewDeleteShader>;
 	const GLchar * text;
 	GLint len;
 	GLuint type;
-	mutable std::optional<ShaderRef> shader {};
 };
-- 
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