From 979c226bdcd7904db5bd23dfbf526de4c040f436 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 21 Jan 2024 02:39:30 +0000
Subject: Look for and replace GL_XXX with fixed string

---
 gfx/gl/shader.cpp | 11 ++++++++++-
 gfx/gl/shader.h   |  7 ++++++-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/gfx/gl/shader.cpp b/gfx/gl/shader.cpp
index 285c2c3..b57dcd4 100644
--- a/gfx/gl/shader.cpp
+++ b/gfx/gl/shader.cpp
@@ -10,7 +10,16 @@ Shader::compile() const
 	auto source = [&shader](auto text, GLint len) {
 		glShaderSource(shader, 1, &text, &len);
 	};
-	source(text.data(), static_cast<GLint>(text.length()));
+	if (lookups) {
+		std::basic_string<GLchar> textMod {text};
+		for (const auto & match : ctre::range<R"(\bGL_[A-Z_]+\b)">(textMod)) {
+			textMod.replace(match.begin(), match.end(), "255");
+		}
+		source(textMod.c_str(), static_cast<GLint>(textMod.length()));
+	}
+	else {
+		source(text.data(), static_cast<GLint>(text.length()));
+	}
 	glCompileShader(shader);
 
 	CheckShaderError(shader, GL_COMPILE_STATUS, false, "Error compiling shader!");
diff --git a/gfx/gl/shader.h b/gfx/gl/shader.h
index cc1bbc0..c6b45af 100644
--- a/gfx/gl/shader.h
+++ b/gfx/gl/shader.h
@@ -3,12 +3,16 @@
 #include <glRef.h>
 #include <glad/gl.h>
 #include <string_view>
+#include <thirdparty/ctre/include/ctre.hpp>
 
 class Shader {
 public:
 	using ShaderRef = glRef<GLuint, &glCreateShader, &glDeleteShader>;
 
-	constexpr Shader(const GLchar * text, GLuint type) : text {text}, type {type} { }
+	constexpr Shader(const GLchar * text, GLuint type) :
+		text {text}, type {type}, lookups {ctre::search<R"(\bGL_[A-Z_]+\b)">(this->text)}
+	{
+	}
 
 	[[nodiscard]] ShaderRef compile() const;
 	static void CheckShaderError(GLuint shader, GLuint flag, bool isProgram, std::string_view errorMessage);
@@ -16,4 +20,5 @@ public:
 private:
 	const std::basic_string_view<GLchar> text;
 	GLuint type;
+	bool lookups;
 };
-- 
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