From 3eec99589dadfa842af9d21d18cf871ca2d9a635 Mon Sep 17 00:00:00 2001
From: malloc <aleco@aroltd.com>
Date: Wed, 22 Aug 2018 17:01:47 -0500
Subject: [PATCH] shaded boob

---
 src/client/shaders/_shader.cpp | 65 ++++++++++++++++++++++++++++++++++
 src/client/shaders/_shader.hpp | 59 +++++++++++++++++++++++++++---
 2 files changed, 119 insertions(+), 5 deletions(-)

diff --git a/src/client/shaders/_shader.cpp b/src/client/shaders/_shader.cpp
index 2bf08d8..d3de410 100644
--- a/src/client/shaders/_shader.cpp
+++ b/src/client/shaders/_shader.cpp
@@ -1,2 +1,67 @@
 #include "_shader.hpp"
 
+sosc::Shader::Shader() : loaded(false) {}
+
+bool sosc::Shader::Load() {
+    if(this->loaded)
+        return true;
+
+    program = glCreateProgram();
+    if(!PrepareLoad())
+        return false;
+
+    this->loaded = true;
+    return true;
+}
+
+void sosc::Shader::Start() const {
+    if(!this->loaded)
+        return;
+
+    glUseProgram(this->program);
+}
+
+void sosc::Shader::Stop() const {
+    if(!this->loaded)
+        return;
+
+    glUseProgram(0);
+}
+
+void sosc::Shader::Unload() {
+    if(!this->loaded)
+        return;
+
+    PrepareUnload();
+    glDeleteProgram(this->program);
+    this->loaded = false;
+}
+
+void sosc::Shader::AttachSource
+    (const std::string& fileName, GLuint shaderType)
+{
+    if(this->loaded)
+        return;
+
+
+}
+
+void sosc::Shader::LinkProgram() {
+    glLinkProgram(this->program);
+    for(const auto& shader : this->shaders)
+        glDeleteShader(shader);
+}
+
+void sosc::Shader::LoadUniforms(std::vector<std::string> names) {
+    if(this->loaded)
+        return;
+
+    GLint id;
+    this->locations.clear();
+    for(const auto& name : names) {
+        if((id = glGetUniformLocation(this->program, name.c_str())) == -1)
+            throw ShaderUniformException(name);
+
+        this->locations.push_back(id);
+    }
+}
\ No newline at end of file
diff --git a/src/client/shaders/_shader.hpp b/src/client/shaders/_shader.hpp
index 90b338c..16b59e7 100644
--- a/src/client/shaders/_shader.hpp
+++ b/src/client/shaders/_shader.hpp
@@ -3,25 +3,74 @@
 
 #include "common.hpp"
 #include <GL/glew.h>
-#include <cstdarg>
+#include <vector>
+#include <exception>
+#include <sstream>
+#include <fstream>
+
+namespace sosc {
+struct ShaderCompilationException : public std::exception {
+public:
+    ShaderCompilationException
+        (const std::string& shaderName, const std::string& errorInfo)
+    {
+        std::stringstream ss;
+        ss << "Error in '" << shaderName << "': " << errorInfo;
+        this->errorInfo = ss.str();
+    }
+
+    const char* what() noexcept {
+        return this->errorInfo.c_str();
+    }
+private:
+    std::string errorInfo;
+};
+
+struct ShaderUniformException : public std::exception {
+public:
+    explicit ShaderUniformException(const std::string& uniformName) {
+        std::stringstream ss;
+        ss << "Could not find uniform '" << uniformName << "'.";
+        this->errorInfo = ss.str();
+    }
+
+    const char* what() noexcept {
+        return this->errorInfo.c_str();
+    }
+private:
+    std::string errorInfo;
+};
 
 class Shader {
 public:
     Shader();
+
     bool Load();
+    void Start() const;
 
-    void Start();
-    void Stop();
+    inline GLint operator[] (std::vector::size_type index) {
+        return locations[index];
+    }
 
+    inline GLint Uniform(std::vector::size_type index) {
+        return locations[index];
+    }
+
+    void Stop() const;
     void Unload();
 protected:
     virtual bool PrepareLoad() = 0;
     virtual void PrepareUnload() {};
 
-    bool AttachSource();
-    bool FetchUniforms(int count, GLint* ids, ...);
+    void AttachSource(const std::string& fileName, GLuint shaderType);
+    void LinkProgram();
+    void LoadUniforms(std::vector<std::string> names);
 private:
+    std::vector<GLint> locations;
+    std::vector<GLuint> shaders;
     GLuint program;
+    bool loaded;
 };
+}
 
 #endif