void PTexMesh::RenderSubMesh()

in ReplicaSDK/ptex/PTexLib.cpp [86:125]

• 30 lines of code
• 1 McCabe index (conditional complexity)

void PTexMesh::RenderSubMesh(
    size_t subMesh,
    const pangolin::OpenGlRenderState& cam,
    const Eigen::Vector4f& clipPlane) {
  ASSERT(subMesh < meshes.size());
  Mesh& mesh = *meshes[subMesh];

  shader.Bind();
  shader.SetUniform("MVP", cam.GetProjectionModelViewMatrix());
  shader.SetUniform("tileSize", (int)tileSize);
  shader.SetUniform("exposure", exposure);
  shader.SetUniform("gamma", 1.0f / gamma);
  shader.SetUniform("saturation", saturation);
  shader.SetUniform("clipPlane", clipPlane(0), clipPlane(1), clipPlane(2), clipPlane(3));

  shader.SetUniform("widthInTiles", int(mesh.atlas.width / tileSize));

  glActiveTexture(GL_TEXTURE0);
  mesh.atlas.Bind();

  glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, mesh.abo.bo);

  mesh.vbo.Bind();
  glVertexAttribPointer(0, mesh.vbo.count_per_element, mesh.vbo.datatype, GL_FALSE, 0, 0);
  glEnableVertexAttribArray(0);
  mesh.vbo.Unbind();

  mesh.ibo.Bind();
  // using GL_LINES_ADJACENCY here to send quads to geometry shader
  glDrawElements(GL_LINES_ADJACENCY, mesh.ibo.num_elements, mesh.ibo.datatype, 0);
  mesh.ibo.Unbind();

  glDisableVertexAttribArray(0);
  glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, 0);

  glActiveTexture(GL_TEXTURE0);
  mesh.atlas.Unbind();

  shader.Unbind();
}