From 37cf42527b9de668c0e1e5834fa597423eb24bf4 Mon Sep 17 00:00:00 2001
From: Tleety <dahltobbe@hotmail.com>
Date: Thu, 10 Dec 2015 16:03:48 +0100
Subject: [PATCH] RenderState class structure made.

---
 include/Engine/Rendering/RenderState.h | 22 +++++++
 src/Engine/Rendering/RenderState.cpp   | 81 ++++++++++++++++++++++++++
 2 files changed, 103 insertions(+)
 create mode 100644 include/Engine/Rendering/RenderState.h
 create mode 100644 src/Engine/Rendering/RenderState.cpp

diff --git a/include/Engine/Rendering/RenderState.h b/include/Engine/Rendering/RenderState.h
new file mode 100644
index 00000000..76816308
--- /dev/null
+++ b/include/Engine/Rendering/RenderState.h
@@ -0,0 +1,22 @@
+#ifndef RenderState_h__
+#define RenderState_h__
+
+#include "../Common.h"
+#include "../OpenGL.h"
+#include "../GLM.h"
+
+class RenderState 
+{
+public:
+    RenderState();
+    ~RenderState();
+    bool Enable(GLenum GLEnable);
+    bool CullFace(GLenum GlFaceToCull);
+    bool ClearColor(glm::vec4 color);
+    bool Clear(GLbitfield mask);
+private:
+    std::vector<GLenum> m_Enables;
+    float m_preClearColor[4];
+    GLenum m_preCullFace;
+};
+#endif
\ No newline at end of file
diff --git a/src/Engine/Rendering/RenderState.cpp b/src/Engine/Rendering/RenderState.cpp
new file mode 100644
index 00000000..6844dbfd
--- /dev/null
+++ b/src/Engine/Rendering/RenderState.cpp
@@ -0,0 +1,81 @@
+#include "Rendering/RenderState.h"
+
+RenderState::RenderState()
+{
+}
+
+bool RenderState::Enable(GLenum GLEnable)
+{
+    if(glIsEnabled(GLEnable))
+    {
+        LOG_WARNING("Trying to enable somthing that is already enabled.");
+        return false;
+    }
+    m_Enables.push_back(GLEnable);
+    glEnable(GLEnable);
+    if (GLERROR("RenderState::Enable"))
+    {
+        return false;
+    }
+    return true;
+}
+
+bool RenderState::CullFace(GLenum GLCullFace)
+{
+    if(!glIsEnabled(GL_CULL_FACE))
+    {
+        LOG_ERROR("Setting GL_CULL_FACE without enabling it.");
+        return false;
+    }
+    
+    GLint a;
+    glGetIntegerv(GL_CULL_FACE_MODE, &a);
+    if(a == GL_BACK)
+    {
+        LOG_INFO("Setting Cullface to back, unessesary since this is already default.");
+    }
+    m_preCullFace = a;
+    glCullFace(GLCullFace);
+    if (GLERROR("RenderState::CullFace"))
+    {
+        return false;
+    }
+    return true;
+}
+
+bool RenderState::ClearColor(glm::vec4 color)
+{
+    glGetFloatv(GL_COLOR_CLEAR_VALUE, &m_preClearColor[0]);
+    glClearColor(color.r, color.g, color.b, color.a);
+    if (GLERROR("RenderState::ClearColor")) {
+        return false;
+    }
+    return true;
+}
+
+bool RenderState::Clear(GLbitfield mask)
+{
+    glClear(mask);
+    if (GLERROR("RenderState::Clear")) {
+        return false;
+    }
+    return true;
+}
+
+RenderState::~RenderState()
+{
+    //Set cullface to default
+    glCullFace(m_preCullFace);
+
+    //Set color to default
+    glClearColor(m_preClearColor[0], m_preClearColor[1], m_preClearColor[2], m_preClearColor[3]);
+
+    //Disable Enables
+    for (auto i : m_Enables)
+    {
+        glDisable(i);
+    }
+
+    m_Enables.clear();
+}
+