From c3eea71370eb94cff1fd96185458643fab6eb2c5 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Thu, 3 Nov 2022 19:47:46 +0000
Subject: Restructure how shaders are worked with

Needs a tidy-up
---
 gfx/gl/shader.cpp | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 gfx/gl/shader.cpp

(limited to 'gfx/gl/shader.cpp')

diff --git a/gfx/gl/shader.cpp b/gfx/gl/shader.cpp
new file mode 100644
index 0000000..8b0f614
--- /dev/null
+++ b/gfx/gl/shader.cpp
@@ -0,0 +1,41 @@
+#include "shader.h"
+#include <array>
+#include <stdexcept>
+#include <string>
+
+Shader::operator GLuint() const
+{
+	if (!shader) {
+		shader.emplace(type);
+		glShaderSource(*shader, 1, &text, &len);
+		glCompileShader(*shader);
+
+		CheckShaderError(*shader, GL_COMPILE_STATUS, false, "Error compiling shader!");
+	}
+	return *shader;
+}
+
+void
+Shader::CheckShaderError(GLuint shader, GLuint flag, bool isProgram, std::string_view errorMessage)
+{
+	GLint success = 0;
+
+	if (isProgram) {
+		glGetProgramiv(shader, flag, &success);
+	}
+	else {
+		glGetShaderiv(shader, flag, &success);
+	}
+
+	if (success == GL_FALSE) {
+		std::array<GLchar, 1024> error {};
+		if (isProgram) {
+			glGetProgramInfoLog(shader, error.size(), nullptr, error.data());
+		}
+		else {
+			glGetShaderInfoLog(shader, error.size(), nullptr, error.data());
+		}
+
+		throw std::runtime_error {std::string {errorMessage} + ": '" + std::string {error.data(), error.size()} + "'"};
+	}
+}
-- 
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