gls_es20_uniform.h

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/*! \file
  \brief Templated class to hold uniform data for ES20 effects.

  \par Copyright Information

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*/

#ifndef DISTI_GLS_ES20_UNIFORM_H_INCLUDED
#define DISTI_GLS_ES20_UNIFORM_H_INCLUDED

#include "gls_gl.h"
#include "gls_include.h"

namespace disti
{
class GlsUniform
{
public:
    /** Constructor. Sets the dirty flag and "invalid" uniform location.
      */
    GLS_EXPORT GlsUniform( void );

    /** Destructor. Does nothing.
      */
    GLS_EXPORT ~GlsUniform() {}

    /** Grabs the uniform location for this uniform from the program object.
      * \param[in] programObject The program that this uniform belongs to.
      * \param[in] name The name of the variable as provided to the shaders
      * \return The new uniform location, or -1 on failure.
      */
    GLS_EXPORT GLint SetUniformLocation( GLuint programObject, const GLchar* name );

    /** Set single integer uniform data.
      * \param[in] data The uniform value to set.
      */
    GLS_EXPORT void SetUniform1i( int data );

    /** Set two integer uniform data.
      * \param[in] data The uniform value to set.
      */
    GLS_EXPORT void SetUniform2i( int* data );

    /** Set three integer uniform data.
      * \param[in] data The uniform value to set.
      */
    GLS_EXPORT void SetUniform3i( int* data );

    /** Set four integer uniform data.
      * \param[in] data The uniform value to set.
      */
    GLS_EXPORT void SetUniform4i( int* data );

    /** Set single float uniform data.
      * \param[in] data The uniform value to set.
      */
    GLS_EXPORT void SetUniform1f( float data );

    /** Set two float uniform data.
      * \param[in] data The uniform value to set.
      */
    GLS_EXPORT void SetUniform2f( float* data );

    /** Set three float uniform data.
      * \param[in] data The uniform value to set.
      */
    GLS_EXPORT void SetUniform3f( float* data );

    /** Set four float uniform data.
      * \param[in] data The uniform value to set.
      */
    GLS_EXPORT void SetUniform4f( float* data );

    /** Set four float uniform data.
      * \param[in] x the first float value
      * \param[in] y the second float value
      * \param[in] z the third float value
      * \param[in] w the fourth float value
      */
    GLS_EXPORT void SetUniform4f( float x, float y, float z, float w );

    /** Set four float uniform data vectors.  Note that this method doesn't cache the old values,
      * since we would have to dynamically allocate the cache memory based on size. Therefore,
      * prefer SetUniform4f when just setting a single 4 float vector
      * \param[in] size the number of 4 float vectors to set
      * \param[in] data The uniform value to set.
      */
    GLS_EXPORT void SetUniform4fv( int size, float* data );

    /** Set 2x2 matrix uniform data.
      * \param[in] data The uniform value to set.
      */
    GLS_EXPORT void SetUniformMatrix2f( float* data );

    /** Set 3x3 matrix uniform data.
      * \param[in] data The uniform value to set.
      */
    GLS_EXPORT void SetUniformMatrix3f( float* data );

    /** Set 4x4 matrix uniform data.
      * \param[in] data The uniform value to set.
      */
    GLS_EXPORT void SetUniformMatrix4f( float* data );

    /** Mark this uniform as dirty, guaranteeing the uniform will be updated on the next set call.
      */
    GLS_EXPORT void SetDirtyFlag( void );

protected:
    /** The uniform location as provided by the shader program. Defaults to -1. */
    GLint _uniformLocation; // = -1;

    /** If true, the uniform data should be sent to the program object. Defaults to true. */
    bool _isDirty; // = true;

    /** Convenience Union for comparing data. */
    union
    {
        int   as1i;
        int   as2i[ 2 ];
        int   as3i[ 3 ];
        int   as4i[ 4 ];
        float as1f;
        float as2f[ 2 ];
        float as3f[ 3 ];
        float as4f[ 4 ];
        float asMat2[ 4 ];
        float asMat3[ 9 ];
        float asMat4[ 16 ];
    } _data;
};

} // namespace disti

#endif // DISTI_GLS_ES20_UNIFORM_H_INCLUDED