added lightenv class, used to store the environment lighting parameters

src/lighingenv.cpp

@@ -0,0 +1,25 @@
+#include "lighingenv.h"
+#include "imgui/imgui.h"
+#include "texture.h"
+#include <glm/ext.hpp>
+
+LighingEnv::LighingEnv()
+{
+
+}
+
+void LighingEnv::gui()
+{
+    ImGui::Checkbox("Fog", &m_hasFog);
+    if(m_hasFog)
+    {
+        ImGui::SliderFloat("Fog density", &m_fogDensity, 0, 10000, "%.3f", 10.f);
+        ImGui::ColorEdit3("Fog color", glm::value_ptr(m_fogColor));
+        ImGui::Checkbox("Ground fog", &m_isGroundFog);
+        if(m_isGroundFog)
+        {
+            ImGui::SliderFloat("Ground fog floor", &m_fogFloor, -1000, 1000);
+            ImGui::SliderFloat("Ground fog ceiling", &m_fogCeiling, -1000, 1000);
+        }
+    }
+}

src/lighingenv.h

@@ -0,0 +1,45 @@
+#ifndef LIGHINGENV_H
+#define LIGHINGENV_H
+
+#include <glm/vec3.hpp>
+
+class Texture;
+
+class LighingEnv
+{
+    Texture* m_radianceMap;
+    Texture* m_irradianceMap;
+
+    bool m_hasFog;
+    float m_fogDensity;
+    glm::vec3 m_fogColor;
+
+    bool m_isGroundFog;
+    float m_fogFloor;
+    float m_fogCeiling;
+
+public:
+    LighingEnv();
+
+    // environment mapping methods
+
+    void setRadianceMap(Texture* tex); // used for the specular component
+    void setIrradianceMap(Texture* tex); // used for the diffuse component
+
+    // fog methods
+
+    void setNoFog() { m_hasFog = false; }
+
+    void setUniformFog(float fogDensity, glm::vec3 fogColor)
+    { m_hasFog = true; m_fogDensity = fogDensity; m_fogColor = fogColor; }
+
+    void setGroundFog(float fogDensity, glm::vec3 fogColor, float fogFloor, float fogCeiling)
+    { setUniformFog(fogDensity, fogColor); m_isGroundFog = true; m_fogFloor = fogFloor; m_fogCeiling = fogCeiling; }
+
+    /**
+     * @brief this gui does not include the begin/end calls, only the fog editor
+     */
+    void gui();
+};
+
+#endif // LIGHINGENV_H