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72f6dc612c
OpenGl_ShaderManager - metallic-roughness, emissive, occlusion and normal texture maps are now supported by PBR. Emissive, occlusion and normal texture maps are now supported by Phong shading model. Path-Tracing now handles metallic-roughness and emissive texture maps. Graphic3d_TextureUnit enumeration has been extended by new values corresponding to supported texture maps. OpenGl_TextureSet and OpenGl_ShaderProgram have been extended with bitmask Graphic3d_TextureSetBits identifying texture slots read from GLSL Program and slots defined within Texture Set to avoid undefined behavior by binding mock textures. OpenGl_TextureSet now duplicates texture unit information to handle textures shared across multiple slots (like Occlusion [R] + Metallic-Roughness [GB]). OpenGl_Context::BindTextures() has been extended with active GLSL program paramter to set mock textures to texture units used by program but undefined by texture set. OpenGl_Workspace::ApplyAspects() has been extended with parameter to avoid bining texture set.