gls_state_manager_es20_interface.h

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/*! \file
  \brief IGlsStateManager, interface to a state manager that manages the GL Studio
runtime library's use of the OpenGL context, minimizing unnecessary state changes.

  \par Copyright Information

  Copyright (c) 2017 by The DiSTI Corporation.<br>
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  <br>
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*/

#ifndef DISTI_GLS_STATE_MANAGER_ES20_INTERFACE_H_INCLUDED
#define DISTI_GLS_STATE_MANAGER_ES20_INTERFACE_H_INCLUDED

#include "gls_state_manager_interface.h"

#include "gls_es20_effect.h"
#include "gls_es20_effect_params.h"

#ifndef LESS_MAX_LIGHTS
#    define MAX_LIGHTS 8
#else
#    define MAX_LIGHTS 6
#endif

namespace disti
{
/** \interface IGlsStateManagerES20
  * The interface to a state manager that manages the GL Studio
  * runtime library's use of the OpenGL context, minimizing unnecessary state changes,
  * and has support for managing shaders.
  */
class IGlsStateManagerES20 : virtual public IGlsStateManager
{
public:
    /** Structure used to replic8 the Fixed-Function lighting model */
    struct gl_LightSourceParameters
    {
        GLfloat _ambient[ 4 ];
        GLfloat _diffuse[ 4 ];
        GLfloat _specular[ 4 ];
        GLfloat _position[ 4 ];

        GLfloat _spotDirection[ 3 ];

        float _spotExponent;
        float _spotCutoff;

        float _constantAttenuation;
        float _linearAttenuation;
        float _quadraticAttenuation;
    };

    ////////////////////////////////////////////////////////////////
    //
    // Matrix Stack
    //
    ////////////////////////////////////////////////////////////////
    GLS_EXPORT virtual GlsMatrixType& GetTopModelViewMatrix( void ) = 0;
    GLS_EXPORT virtual GlsMatrixType& GetTopProjMatrix( void )      = 0;

    ////////////////////////////////////////////////////////////////
    //
    // The following methods manage the various OpenGL state calls
    //
    ////////////////////////////////////////////////////////////////
    GLS_EXPORT virtual void TangentArrayEnabled( bool val )  = 0;
    GLS_EXPORT virtual void BinormalArrayEnabled( bool val ) = 0;

    GLS_EXPORT virtual void TangentPointer( GLenum type, GLsizei stride, const GLvoid* pointer )  = 0;
    GLS_EXPORT virtual void BinormalPointer( GLenum type, GLsizei stride, const GLvoid* pointer ) = 0;

    GLS_EXPORT virtual void AlphaBlendFuncSeparate( GLenum srcColor, GLenum dstColor, GLenum srcAlpha, GLenum dstAlpha ) = 0;
    GLS_EXPORT virtual void AlphaBlendFunc( GLenum src, GLenum dst )                                                     = 0;
    GLS_EXPORT virtual void PushAlphaBlendFunc()                                                                         = 0;
    GLS_EXPORT virtual void PopAlphaBlendFunc()                                                                          = 0;

    ////////////////////////////////////////////////////////////////
    //
    // The following methods manage the effects
    //
    ////////////////////////////////////////////////////////////////
    GLS_EXPORT virtual gl_LightSourceParameters& GetLightSourceParameters( unsigned int index ) = 0;

    /** Enable the given custom shader program and push it to the top of the custom shader program stack
      * \param effect custom shader program
      * \param useProgramImmediately GL_TRUE if custom shader program should immediately be set as the active
      *                              shader program else GL_FALSE to allow the state manager to set the program
      *                              active when it is needed
      * \pre number of custom shader programs is < CUSTOM_SHADER_PROGRAM_STACK_DEPTH
      * \post the given custom shader program is at the top of the custom shader program stack and is enabled, it
      *       is set to the current active shader program if useProgramImmediately is GL_TRUE
      */
    GLS_EXPORT virtual void PushCustomShaderProgram( GlsEffect* effect, const GLboolean useProgramImmediately ) = 0;

    /** Pop the custom shader program stack enabling the next custom shader program on the stack if there is one
      * \pre number of custom shader programs is > 0
      * \post the custom shader program stack is popped enabling the next custom shader program on the stack if there is one
      */
    GLS_EXPORT virtual void PopCustomShaderProgram( void ) = 0;

    /** Returns true if there is at least one custom shader on the stack
      */
    GLS_EXPORT virtual bool HasCustomShader( void ) const = 0;

    /** Select the appropriate shader program based on the current settings and update
      * the current shader program if needed
      * \param forceUpdate GL_TRUE to force uniforms to be updated as if shader program changed
      * \pre none
      * \post appropriate shader program based on the current settings is active
      */
    GLS_EXPORT virtual void UpdateShaderProgram( const GLboolean forceUpdate ) = 0;

    /** Update the attributes for the current shader as needed
      * \pre none
      * \post Appropriate attributes for the current shader are updated
      */
    GLS_EXPORT virtual void UpdateShaderAttributes( void ) = 0;

    /** Update the uniforms for the current shader as needed
      * \pre none
      * \post Appropriate uniforms for the current shader are updated
      */
    GLS_EXPORT virtual void UpdateShaderUniforms( void ) = 0;

protected:
    /** empty ctor */
    IGlsStateManagerES20( void ) {}

    /** empty dtor */
    ~IGlsStateManagerES20() {}
};

} // namespace disti

#endif // DISTI_GLS_STATE_MANAGER_ES20_INTERFACE_H_INCLUDED