SdfTextShader.h

// Copyright eeGeo Ltd (2012-2014), All Rights Reserved

#pragma once

#include "Shader.h"
#include "IdTypes.h"
#include "Graphics.h"
#include "Rendering.h"
#include "VectorMath.h"
#include <string>

namespace Eegeo
{
    namespace Rendering
    {
        namespace Shaders
        {
            class SdfTextShader : public Shader
            {
            public:
                static SdfTextShader* CreateNull(const TShaderId shaderId);
                
                static SdfTextShader* CreateSignedDistanceFieldUniformScale(const TShaderId shaderId);
                
                static SdfTextShader* CreateSignedDistanceFieldUniformScaleSuperSampled(const TShaderId shaderId);
                
                static SdfTextShader* CreateSignedDistanceField(const TShaderId shaderId);
                
                static SdfTextShader* CreateSignedDistanceFieldSuperSampled(const TShaderId shaderId);
                
                
                const GLuint GetDiffuseSamplerId() const;
                
                void SetMVP(const m44& mvp) const;
                
                void SetScale(const v3& scale) const;
                
                void SetGlyphColor(const v4& rgba) const;
                
                void SetSdfConstants(const float sdfSpread, const float textureSize, const float texelToPixelRatio, const float haloSize, const float haloHardness, const float antiAliasTweakMultiplier) const;
                
                void Use(Rendering::GLState& glState) const;
                
            private:
                GLuint m_modelViewProjectionUniformLocation;
                GLuint m_scaleUniformLocation;
                GLuint m_glyphColorUniformLocation;
                GLuint m_diffuseTextureSampleUniformLocation;
                GLuint m_sdfConstantsUniformLocation;
                
                const bool m_isUniformScale;
                const bool m_isNull;
                
                SdfTextShader(const TShaderId shaderId, const std::string& vertexCode, const std::string& fragmentCode, bool isUniformScale, bool isNull = false);
            };
        }
    }
}