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8613985b2a
FFP state management (light sources, matrices, clipping planes) has been moved to OpenGl_ShaderManager for consistency with Programmable Pipeline. OpenGl_Context::BindProgram() does not re-bind already active Program. OpenGl_PrimitiveArray::Render() does not reset active Program at the end. OpenGl_Context::ApplyModelViewMatrix() now checks if matrix differs from already set one before modifying state in Shader Manager. This allows avoing redundant state changes, matrix uploads onto GPU and re-computation of inversed matrices. NCollection_Mat4 has been extended with equality check operators for proper comparison. OpenGl_ShaderManager - the tracking Material state has been added. Removed unreachable states OPENGL_NS_RESMAT, OPENGL_NS_TEXTURE and OPENGL_NS_WHITEBACK. Fixed resetting FFP material state after displaying GL_COLOR_ARRAY vertices; the Material state within Shader Manager is now invalidated within OpenGl_VertexBuffer::unbindFixedColor(). OpenGl_Workspace::ApplyAspectFace() - fixed invalidating Material State when only Highlighting style is changing.