terravisor/include/uniforms.h

#pragma once

#include <GL/glew.h>
#include <glm/glm.hpp>
#include <string>

namespace Uniforms
{
    void Init();
    void BufferSceneData();

    //This structure mirrors the uniform block declared in the shader
    struct SceneUniforms
    {
        glm::mat4 PV;	//camera projection * view matrix
        glm::vec4 eye_w = glm::vec4(0.0f, 0.0f, 3.0f, 1.0f);	//world-space eye position
    };

    struct GeoUniforms
    {
        glm::mat4 PV;
        glm::mat4 M;
        
        float minTessellation =     1.0f;
        float maxTessellation =     32.0f;
        float displacementScale =   0.007f;
        int gridDensity =           16;
    };

    struct LightUniforms
    {
        glm::vec4 La = glm::vec4(0.5f, 0.5f, 0.55f, 1.0f);	//ambient light color
        glm::vec4 Ld = glm::vec4(0.5f, 0.5f, 0.25f, 1.0f);	//diffuse light color
        glm::vec4 Ls = glm::vec4(0.3f);	//specular light color
        glm::vec4 light_w = glm::vec4(0.0f, 1.2, 1.0f, 1.0f); //world-space light position
    };

    struct MaterialUniforms
    {
        glm::vec4 ka = glm::vec4(1.0f);	//ambient material color
        glm::vec4 kd = glm::vec4(1.0f);	//diffuse material color
        glm::vec4 ks = glm::vec4(1.0f);	//specular material color
        float shininess = 20.0f;         //specular exponent
    };

    extern SceneUniforms SceneData;
    extern LightUniforms LightData;
    extern MaterialUniforms MaterialData;
    extern GeoUniforms GeoData;

    //IDs for the buffer objects holding the uniform block data
    extern GLuint sceneUbo;
    extern GLuint lightUbo;
    extern GLuint materialUbo;
    extern GLuint geoUbo;

    namespace UboBinding
    {
        //These values come from the binding value specified in the shader block layout
        extern int scene;
        extern int light;
        extern int material;
        extern int geo;
    };

    //Locations for the uniforms which are not in uniform blocks
    namespace UniformLocs
    {
        extern int M; //model matrix
        extern int time;
    };
};