Method run_stencil_prepass

libraries/lib-engine/src/renderer-pbr.cpp:162–201

}

void pbr_renderer::run_stencil_prepass(const view_data & view, const render_payload & scene)
{
    gl_check_error(__FILE__, __LINE__);

    GLboolean colorMask[4];
    glGetBooleanv(GL_COLOR_WRITEMASK, &colorMask[0]);
    GLboolean wasCullingEnabled = glIsEnabled(GL_CULL_FACE);
    GLboolean wasDepthTestingEnabled = glIsEnabled(GL_DEPTH_TEST);
    GLboolean wasBlendingEnabled = glIsEnabled(GL_BLEND);

    glColorMask(0, 0, 0, 0);                                // do not write color
    glDepthMask(GL_FALSE);                                  // do not write depth
    glStencilMask(GL_TRUE);                                 // only write stencil

    glDisable(GL_BLEND);                                    // 0 into alpha
    glDisable(GL_DEPTH_TEST);                               // disable depth
    glDisable(GL_CULL_FACE);                                // do not cull since winding will might be flipped per-eye
    glEnable(GL_STENCIL_TEST);                              // enable stencil test

    glStencilFunc(GL_ALWAYS, 1, 1);                         // set stencil func
    glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);        // set stencil op (GL_REPLACE, GL_REPLACE, GL_REPLACE)

    auto & shader = no_op.get()->get_variant()->shader;
    shader.bind();
    if (view.index == 0) left_stencil_mask.draw_elements();
    else if (view.index == 1) right_stencil_mask.draw_elements();
    shader.unbind();

    glStencilFunc(GL_EQUAL, 0, 1);                          // reset stencil func
    glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);                 // reset stencil op

    glDepthMask(GL_TRUE);                                   // it's ok to write depth
    glStencilMask(GL_FALSE);                                // no other passes should write to stencil
    glColorMask(colorMask[0], colorMask[1], colorMask[2], colorMask[3]); // Restore color mask state
    if (wasCullingEnabled) glEnable(GL_CULL_FACE);
    if (wasDepthTestingEnabled) glEnable(GL_DEPTH_TEST);
    if (wasBlendingEnabled) glEnable(GL_BLEND);

    gl_check_error(__FILE__, __LINE__);
}

void pbr_renderer::set_stencil_mask(const uint32_t idx, gl_mesh && m)
{