C++ (Cpp) ref_ptr::GetUniformLocation Examples

Example #1

File: glstate.cpp Project: ipaddr/omim

void ApplyTextures(GLState state, ref_ptr<GpuProgram> program)
{
  ref_ptr<Texture> tex = state.GetColorTexture();
  int8_t colorTexLoc = -1;
  if (tex != nullptr && (colorTexLoc = program->GetUniformLocation("u_colorTex")) >= 0)
  {
    GLFunctions::glActiveTexture(gl_const::GLTexture0);
    tex->Bind();
    GLFunctions::glUniformValuei(colorTexLoc, 0);
    tex->SetFilter(state.GetTextureFilter());
  }
  else
  {
    // Some Android devices (Galaxy Nexus) require to reset texture state explicitly.
    // It's caused by a bug in OpenGL driver (for Samsung Nexus, maybe others). Normally 
    // we don't need to explicitly call glBindTexture(GL_TEXTURE2D, 0) after glUseProgram
    // in case of the GPU-program doesn't use textures. Here we have to do it to work around
    // graphics artefacts. The overhead isn't significant, we don't know on which devices 
    // it may happen so do it for all Android devices.
#ifdef OMIM_OS_ANDROID
    GLFunctions::glActiveTexture(gl_const::GLTexture0);
    GLFunctions::glBindTexture(0);
#endif
  }

  tex = state.GetMaskTexture();
  int8_t maskTexLoc = -1;
  if (tex != nullptr && (maskTexLoc = program->GetUniformLocation("u_maskTex")) >= 0)
  {
    GLFunctions::glActiveTexture(gl_const::GLTexture0 + 1);
    tex->Bind();
    GLFunctions::glUniformValuei(maskTexLoc, 1);
    tex->SetFilter(state.GetTextureFilter());
  }
  else
  {
    // Some Android devices (Galaxy Nexus) require to reset texture state explicitly.
    // See detailed description above.
#ifdef OMIM_OS_ANDROID
    GLFunctions::glActiveTexture(gl_const::GLTexture0 + 1);
    GLFunctions::glBindTexture(0);
#endif
  }
}