From a556b45abf18f1bd509daaf63b66b7d55e9fd291 Mon Sep 17 00:00:00 2001
From: jjesswan <jessica_wan@brown.edu>
Date: Mon, 22 Apr 2024 21:56:26 -0400
Subject: add engine version

---
 engine-ocean/Graphics/shaderloader.h | 98 ++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 engine-ocean/Graphics/shaderloader.h

(limited to 'engine-ocean/Graphics/shaderloader.h')

diff --git a/engine-ocean/Graphics/shaderloader.h b/engine-ocean/Graphics/shaderloader.h
new file mode 100644
index 0000000..eeb8e8c
--- /dev/null
+++ b/engine-ocean/Graphics/shaderloader.h
@@ -0,0 +1,98 @@
+#pragma once
+
+#include "debug.h"
+
+#include <vector>
+#include <string>
+#include <stdexcept>
+#include <fstream>
+#include <iostream>
+
+class ShaderLoader{
+public:
+    static GLuint createShaderProgram(std::vector<GLenum> shaderTypes, std::vector<const char*> filepaths){
+        // Create and compile shaders
+        std::vector<GLuint> shaderIDs;
+        for(int i = 0; i<shaderTypes.size(); i++){
+            shaderIDs.push_back(createAndCompileShader(shaderTypes[i], filepaths[i]));
+        }
+
+        // Link the shader program
+        GLuint programID = glCreateProgram();
+        for(int i = 0; i<shaderIDs.size(); i++){
+            glAttachShader(programID, shaderIDs[i]);
+        }
+        glLinkProgram(programID);
+
+        // Print the info log if program fails to link
+        GLint status;
+        glGetProgramiv(programID, GL_LINK_STATUS, &status);
+        if(status == GL_FALSE){
+            GLint length;
+            glGetProgramiv(programID, GL_INFO_LOG_LENGTH, &length);
+            std::string log(length, '\0');
+            glGetProgramInfoLog(programID, length, nullptr, &log[0]);
+            glDeleteProgram(programID);
+            throw std::runtime_error(log);
+        }
+
+        // Individual shaders no longer necessary, stored in program
+        for(int i = 0; i<shaderIDs.size(); i++){
+            glDeleteShader(shaderIDs[i]);
+        } 
+
+        std::cout<<"END OF SHADERLOADER"<<std::endl;
+        return programID;
+    }
+
+private:
+    static std::string readFile(const char *filePath) {
+        std::cout<<"READ FILE: "<<std::string(filePath)<<std::endl;
+        std::string content;
+        std::ifstream fileStream(filePath, std::ios::in);
+
+        if(!fileStream.is_open()) {
+            std::string log = "Could not read file "+std::string(filePath)+". File does not exist.";
+            throw std::runtime_error(log);
+            return "";
+        }
+
+        std::string line = "";
+        while(std::getline(fileStream, line)) {
+            content.append(line + "\n");
+        }
+
+        fileStream.close();
+
+        return content;
+    }
+
+    static GLuint createAndCompileShader(GLenum shaderType, const char* filepath){
+        std::cout<<"CREATE AND COMPILE SHADER: "<<shaderType<<std::endl;
+        GLuint shaderID = glCreateShader(shaderType);
+
+        // Read shader file
+        std::string shaderStr = readFile(filepath);
+        const char* shaderSrc = shaderStr.c_str();
+
+        std::cout<<"GL SHADER SOURCE"<<std::endl;
+        glShaderSource(shaderID, 1, &shaderSrc, NULL);
+
+        std::cout<<"GL COMPILE SHADER: "<<shaderID<<std::endl;
+        glCompileShader(shaderID);
+
+        // Print info log if shader fails to compile
+        GLint status;
+        glGetShaderiv(shaderID, GL_COMPILE_STATUS, &status);
+        if(status == GL_FALSE){
+            GLint length;
+            glGetShaderiv(shaderID, GL_INFO_LOG_LENGTH, &length);
+            std::string log(length, '\0');
+            glGetShaderInfoLog(shaderID, length, nullptr, &log[0]);
+            glDeleteShader(shaderID);
+            throw std::runtime_error(log);
+        }
+
+        return shaderID;
+    }
+};
\ No newline at end of file
-- 
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