/*
*      Copyright (C) 2005-2008 Team XBMC
*      http://www.xbmc.org
*
*  This Program is free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 2, or (at your option)
*  any later version.
*
*  This Program is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
*  GNU General Public License for more details.
*
*  You should have received a copy of the GNU General Public License
*  along with XBMC; see the file COPYING.  If not, write to
*  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*  http://www.gnu.org/copyleft/gpl.html
*
*/


#include "system.h"

#if HAS_GLES == 2

#include "GUIShader.h"
#include "MatrixGLES.h"
#include "utils/log.h"

CGUIShader::CGUIShader( const char *shader ) : CGLSLShaderProgram("guishader_vert.glsl", shader ? shader : "guishader_frag.glsl" )
{
  // Initialise values
  m_hTex0   = 0;
  m_hTex1   = 0;
  m_hMethod = 0;
  m_hProj   = 0;
  m_hModel  = 0;
  m_hPos    = 0;
  m_hCol    = 0;
  m_hCord0  = 0;
  m_hCord1  = 0;

  m_method = SM_DEFAULT;
  m_proj   = NULL;
  m_model  = NULL;
}

void CGUIShader::OnCompiledAndLinked()
{
  // This is called after CompileAndLink()

  // Variables passed directly to the Fragment shader
  m_hTex0   = glGetUniformLocation(ProgramHandle(), "m_samp0");
  m_hTex1   = glGetUniformLocation(ProgramHandle(), "m_samp1");
  m_hMethod = glGetUniformLocation(ProgramHandle(), "m_method");
  // Variables passed directly to the Vertex shader
  m_hProj   = glGetUniformLocation(ProgramHandle(), "m_proj");
  m_hModel  = glGetUniformLocation(ProgramHandle(), "m_model");
  m_hPos    = glGetAttribLocation(ProgramHandle(),  "m_attrpos");
  m_hCol    = glGetAttribLocation(ProgramHandle(),  "m_attrcol");
  m_hCord0  = glGetAttribLocation(ProgramHandle(),  "m_attrcord0");
  m_hCord1  = glGetAttribLocation(ProgramHandle(),  "m_attrcord1");

  // it's okay to do this only one time. Textures units never change
  glUniform1i(m_hTex0, 0);
  glUniform1i(m_hTex1, 1);

}

bool CGUIShader::OnEnabled()
{
  // This is called after glUseProgram()

  glUniform1i(m_hMethod, (int)m_method);
  glUniformMatrix4fv(m_hProj,  1, GL_FALSE, g_matrices.GetMatrix(MM_PROJECTION));
  glUniformMatrix4fv(m_hModel, 1, GL_FALSE, g_matrices.GetMatrix(MM_MODELVIEW));

  return true;
}

void CGUIShader::Free()
{
  // Do Cleanup here
  CGLSLShaderProgram::Free();
}

#endif