/**
 * Stone of Orthanc
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2019 Osimis S.A., Belgium
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License
 * as published by the Free Software Foundation, either version 3 of
 * the License, 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
 * Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 **/


#include "OpenGLColorTextureProgram.h"
#include "OpenGLShaderVersionDirective.h"

static const char* FRAGMENT_SHADER = 
  ORTHANC_STONE_OPENGL_SHADER_VERSION_DIRECTIVE
  "uniform sampler2D u_texture;                       \n"
  "varying vec2 v_texcoord;                           \n"
  "void main()                                        \n"
  "{                                                  \n"
  "  gl_FragColor = texture2D(u_texture, v_texcoord); \n"
  "}";


namespace OrthancStone
{
  namespace Internals
  {
    OpenGLColorTextureProgram::OpenGLColorTextureProgram(OpenGL::IOpenGLContext&  context) :
      program_(context, FRAGMENT_SHADER)
    {
    }

    
    void OpenGLColorTextureProgram::Apply(OpenGL::OpenGLTexture& texture,
                                          const AffineTransform2D& transform,
                                          bool useAlpha)
    {
      OpenGLTextureProgram::Execution execution(program_, texture, transform);

      if (useAlpha)
      {
        glEnable(GL_BLEND);
        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
        execution.DrawTriangles();
        glDisable(GL_BLEND);
      }
      else
      {
        execution.DrawTriangles();
      }
    }
  }
}